CN110904466B - Electrolytic sodium hypochlorite generator system and operation method - Google Patents

Abstract

The invention discloses a sodium hypochlorite generator system by an electrolytic method and an operation method thereof, and the sodium hypochlorite generator system comprises a soft water production device for producing soft water, a bath salt generation device for preparing salt solution for electrolysis, an electrolysis generation device for producing sodium hypochlorite by using electrolytic solution, a raw material adding device for adding various raw materials, a storage device for storing the sodium hypochlorite and a waste gas treatment device for treating waste gas in production. Carry out sodium hypochlorite's electrolytic treatment through the generator system who optimizes, including the requirement to solution configuration concentration to in final exhaust-gas treatment, handle chlorine through sodium hydroxide solution, and discharge the atmosphere after mixing hydrogen and nitrogen gas, prevent to produce the problem of explosion under the hydrogen high concentration, and can solve the groove problem of exploding under the certain circumstances through the optimization structure that sets up, possess a lot of advantages.

Description

Electrolytic sodium hypochlorite generator system and operation method

Technical Field

The invention particularly relates to an electrolytic sodium hypochlorite generator system and an operation method thereof.

Background

The prior art is as follows: the sodium hypochlorite is produced by dissolving common salt into common salt water with higher concentration, mixing soft water with common salt water to prepare common salt water with lower concentration for electrolysis, adding the prepared common salt water with lower concentration into an electrolytic cell for electrolysis, and removing impurities from waste gas generated in the production. In the above process, the following problems, such as the problem of explosion of the battery can and the problem of subsequent treatment of the generated hydrogen and chlorine gases, are often generated, and mainly aiming at the two problems, the invention provides a generator system and an operation method capable of primarily solving the problems.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide an electrolytic sodium hypochlorite generator system, which comprises a soft water production device for producing soft water, a bath salt generation device for preparing saline solution for electrolysis, an electrolysis generation device for producing sodium hypochlorite by using electrolytic solution, a raw material adding device for adding various raw materials, a storage device for storing the sodium hypochlorite and a waste gas treatment device for treating waste gas in production, wherein the waste gas treatment device comprises reaction kettles which are arranged in a layered manner, a containing cavity made of a ptfe membrane and a spray header arranged below the containing cavity are arranged at the middle separation position, the ptfe membrane can only be passed through by gas, the waste gas is connected with a lower-layer gas inlet of the reaction kettle, the NaOH solution is added into the lower-layer of the reaction kettle by the spray header after entering the containing cavity made of the ptfe membrane, a gas outlet is arranged at the upper layer of the reaction kettle and is connected with a three-way pipe, the wet starch KI test paper is arranged at the core position of the three-way pipe, a first outlet of the three-way pipe is connected with an air outlet of the reaction kettle, a second outlet of the three-way pipe is connected with a gas backflow hole of the reaction kettle and the gas backflow hole is positioned at the lower layer of the reaction kettle, a one-way valve is arranged in a pipeline between the reaction kettle and the second outlet of the three-way pipe, and a pipeline connected with a third outlet of the three-way pipe is provided with a stop valve and a pipeline outlet which is connected with a hydrogen collecting device.

The three-way pipe is provided with a hollow threaded pipe fixing hole, a rotatable one-way blocking piece is arranged at a hollow position inside the hollow threaded pipe, a special-shaped extrusion hollow column matched with the one-way blocking piece is arranged behind air flow of the one-way blocking piece, a center hole for air flow to pass through is formed in the center of the special-shaped extrusion hollow column, the upper end of the special-shaped extrusion hollow column is connected with a transparent test paper observation box, a long section of starch KI test paper is arranged in the transparent test paper observation box, and the starch KI test paper can be pulled in the transparent test paper observation box.

Specifically, waste gas treatment device's reation kettle lower floor connects the alkali lye circulating slot and sets up alkali lye cooling auxiliary device, the alkali lye circulating slot adds the mouth and adds the mouth including the caustic soda that disposes alkali lye adds the mouth with the solution, alkali lye cooling auxiliary device is including laying the water-cooling pipeline at alkali lye circulating slot outer wall and reation kettle outer wall, the water-cooling pipeline water inlet is connected with the cold water source, the delivery port is connected with the storage jar, adds the frozen water mixture by the water inlet of water-cooling pipeline when the cooling water temperature in the water-cooling pipeline is higher than 35, set up a plurality of switches that drain in the water-cooling pipeline, the switch that drains independently sets up, each other does not influence.

Specifically, electrolysis generating device electrode slice department sets up clean sword, clean sword is ya keli material, the motor is connected through the rotation axis to clean sword, and electrode slice both sides are hugged closely to the clean sword, the clean sword sets up to the arc structure, clean sword unilateral sets up two of central symmetry, both sides position synchronous operation.

A method for producing sodium hypochlorite by electrolysis, comprising the steps of:

(1) preparing a solution by connecting a pure water production device to a tap water pipeline and adding pure water after production to a bath salt production device, wherein the solution preparation in the bath salt production device comprises: the soft water production device adopts a membrane separation method to produce soft water for the seed solution, the produced soft water is injected into a water inlet of the bath salt production device, meanwhile, the prepared high-concentration salt water is synchronously added at a feed inlet, and the salt water for electrolysis in the subsequent step is produced after being mixed by the bath salt production device.

(2) And (2) conducting the saline solution obtained in the step (1) to an electrolysis generating device through a pipeline, wherein the electrolysis generating device carries out electrolysis on the solution, and the electrolysis process comprises the following steps:

anode: 2Cl^--2e→Cl²

Cathode: 2Na⁺+2H₂O+2e→H²+2NaOH

In the solution: cl²+2NaOH→NaCl+NaClO+H₂O

And (3) total reaction: NaCl + H₂O→NaClO+H²

(3) Collecting the solution, collecting the sodium hypochlorite solution obtained in the step (2) to a storage device through a pipeline, and guiding the waste gas generated in the production process to a waste gas treatment device.

(4) And (3) treating the waste gas collected in the step (3), including treating hydrogen and chlorine, enabling the waste gas to pass through a configured NaOH solution, then passing through a detection tee joint through an air inlet of an air pump, connecting an air outlet of a waste gas treatment device, arranging a wet starch KI test paper on the tee joint connected with the air outlet, arranging a stop valve behind the wet starch KI test paper, detecting whether the chlorine is completely removed according to whether the wet starch KI test paper on the tee joint turns blue, opening the stop valve when the wet starch KI test paper does not turn blue, enabling the hydrogen to pass through the air pump, collecting the hydrogen to a hydrogen collection device, and continuously closing the stop valve to enable the gas to flow back to continue the process of removing the chlorine under the condition that the chlorine is not completely removed.

Specifically, the percentage concentration of the NaOH solution in the step (4) is 16-18%.

Specifically, in the process of collecting the hydrogen gas into the hydrogen gas collecting device in the step (4), nitrogen gas is injected into the collecting device according to the injection ratio of the hydrogen gas to the nitrogen gas of more than 1:10 by synchronous air blowing, and an explosion-proof membrane is arranged at the top of the collecting device and is arranged vertically upwards.

Specifically, the concentration of the brine used for electrolysis in the step (1) is 3-5%. .

Compared with the prior art, the invention has the following beneficial effects: carry out sodium hypochlorite's electrolytic treatment through the generator system who optimizes, including the requirement to solution configuration concentration to in final exhaust-gas treatment, handle chlorine through sodium hydroxide solution, and discharge the atmosphere after mixing hydrogen and nitrogen gas, prevent to produce the problem of explosion under the hydrogen high concentration, and can solve the groove problem of exploding under the certain circumstances through the optimization structure that sets up, possess a lot of advantages.

Drawings

FIG. 1 is a schematic view of the construction of an exhaust gas treatment device according to the present invention;

FIG. 2 is a schematic view of a cleaning blade according to the present invention;

FIG. 3 is a schematic view of the structure of the hollow threaded tube and the transparent test paper observation box of the present invention;

FIG. 4 is a schematic diagram of a chlorine detection process using a hollow threaded tube and a transparent test paper observation box according to the present invention;

Detailed Description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings provided in the embodiments of the present invention, and it is obvious that the described embodiments are only preferred embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the preferred embodiments of the invention without making any creative effort, shall fall within the protection scope of the invention. The present invention is described in further detail below.

An electrolytic sodium hypochlorite generator system comprises a soft water production device for producing soft water, a bath salt generation device for configuring salt solution for electrolysis, an electrolytic generation device for producing sodium hypochlorite by electrolytic solution, a raw material adding device for adding various raw materials, a storage device for storing sodium hypochlorite and a waste gas treatment device for treating waste gas in production, wherein the waste gas treatment device comprises a reaction kettle, the reaction kettle is arranged in a layered manner, a containing cavity made of a ptfe membrane and a spray header arranged below the containing cavity are arranged at a middle separation position, the ptfe membrane can only pass gas, the waste gas is connected with a lower-layer gas inlet of the reaction kettle, NaOH solution is sprayed and added into the lower layer of the reaction kettle by the spray header after entering the containing cavity made of the ptfe membrane, a gas outlet is arranged at the upper layer of the reaction kettle and connected with a three-way pipe, and moist starch KI test paper is arranged at the core position of the three-way, the three-way pipe is characterized in that a first outlet of the three-way pipe is connected with a gas outlet of the reaction kettle, a second outlet of the three-way pipe is connected with a gas backflow hole of the reaction kettle, the gas backflow hole is positioned at the lower layer of the reaction kettle, a one-way valve is arranged in a pipeline between the reaction kettle and the second outlet of the three-way pipe, a stop valve is arranged on a pipeline connected with a third outlet of the three-way pipe, and a pipeline outlet is connected with a hydrogen collecting device.

Offer hollow screwed pipe fixed orifices on the three-way pipe, the inside hollow department of hollow screwed pipe is provided with rotatable one-way separation blade just the air current rear of one-way separation blade is provided with the hollow post of dysmorphism extrusion that the one-way separation blade of cooperation used, the hollow post central point of dysmorphism extrusion puts and is provided with the centre bore that supplies the air current to pass through, the hollow post upper end of dysmorphism extrusion is connected transparent test paper and is observed the box, set up a long section starch KI test paper in the transparent test paper observation box, the starch KI test paper can the pull in the transparent test paper observation box.

The utility model discloses a waste gas treatment device's reation kettle lower floor connects alkali lye circulation groove and sets up alkali lye cooling auxiliary device, alkali lye circulation groove adds mouthful and solution and adds the mouth including the caustic soda that disposes alkali lye, alkali lye cooling auxiliary device is including laying the water-cooling pipeline at alkali lye circulation groove outer wall and reation kettle outer wall, the water-cooling pipeline water inlet is connected with the cold water source, the delivery port is connected with the storage jar, adds the frozen water mixture by the water inlet of water-cooling pipeline when the cooling water temperature in the water-cooling pipeline is higher than 35, set up a plurality of switches that drain in the water-cooling pipeline, the switch that drains independently sets up, each other does not influence.

The electrode plate of the electrolysis generating device is provided with a cleaning knife which is made of acrylic materials and is connected with a motor through a rotating shaft, the cleaning knife is tightly attached to two sides of the electrode plate and is of an arc-shaped structure, two centrosymmetric cleaning knives are arranged on one side of the cleaning knife, and the two sides of the cleaning knives run synchronously. (in the process of electrolyzing the salt solution, salt particles are gradually formed on the surface of the electrode at the position of the liquid surface to cause crystallization, and if the salt solution is not treated, the crystallization is gradually enlarged until two crystals are contacted to cause a short circuit to initiate the explosion tank, so that the above-mentioned structure is used to prevent the explosion tank problem)

A method for producing sodium hypochlorite by electrolysis, comprising the steps of:

(1) preparing a solution by connecting a pure water production device to a tap water pipeline and adding pure water after production to a bath salt production device, wherein the solution preparation in the bath salt production device comprises: the soft water production device adopts a membrane separation method to produce soft water for the seed solution (tap water pipeline passes through a device comprising a nanofiltration membrane and a reverse osmosis membrane after being pressurized), and the generated soft water is injected into a water inlet of the bath salt generation device, meanwhile, configured high-concentration salt water is synchronously added at a feed inlet, and the salt water used for the electrolysis in the subsequent step is generated after being mixed by the bath salt generation device.

(2) And (2) conducting the saline solution obtained in the step (1) to an electrolysis generating device through a pipeline, wherein the electrolysis generating device carries out electrolysis on the solution, and the electrolysis process comprises the following steps:

anode: 2Cl^--2e→Cl²

Cathode: 2Na⁺+2H₂O+2e→H²+2NaOH

In the solution: cl²+2NaOH→NaCl+NaClO+H₂O

And (3) total reaction: NaCl + H₂O→NaClO+H²

(3) Collecting the solution, collecting the sodium hypochlorite solution obtained in the step (2) to a storage device through a pipeline, and guiding the waste gas generated in the production process to a waste gas treatment device.

(4) And (3) treating the waste gas collected in the step (3), including treating hydrogen and chlorine, enabling the waste gas to pass through a configured NaOH solution, then passing through a detection tee joint through an air inlet of an air pump, connecting an air outlet of a waste gas treatment device, arranging a wet starch KI test paper on the tee joint connected with the air outlet, arranging a stop valve behind the wet starch KI test paper, detecting whether the chlorine is completely removed according to whether the wet starch KI test paper on the tee joint turns blue, opening the stop valve when the wet starch KI test paper does not turn blue, enabling the hydrogen to pass through the air pump, collecting the hydrogen to a hydrogen collection device, and continuously closing the stop valve to enable the gas to flow back to continue the process of removing the chlorine under the condition that the chlorine is not completely removed.

The percentage concentration of the NaOH solution in the step (4) is 16-18% (under the concentration, the effect of absorbing chlorine can be achieved, the preparation is simple, and large heat cannot be generated).

And (3) in the process of collecting the hydrogen into the hydrogen collecting device in the step (4), injecting nitrogen according to the injection ratio of the hydrogen to the nitrogen of more than 1:10 by synchronously blowing air in the collecting device, and arranging an explosion-proof membrane at the top of the collecting device, wherein the direction of the explosion-proof membrane is vertically upward. (the proper injection proportion is selected to ensure that the hydrogen is in the lower limit of the explosive concentration while the hydrogen is collected, so that the production problem of explosion is prevented, and the explosion-proof membrane is arranged to reduce the damage caused by explosion in a mode of breaking through the explosion-proof membrane when slight explosion occurs).

The concentration of the brine used for electrolysis in the step (1) is 3-5% (under the concentration, the electrolysis process can be carried out, the crystallization is less, and the phenomenon of groove explosion caused by crystallization is effectively avoided).

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (7)

1. The utility model provides an electrolysis method sodium hypochlorite generator system, is including the soft water apparatus for producing soft water, the bath salt that the configuration electrolysis used the salt solution to generate the device, the electrolysis generating device of electrolytic solution production sodium hypochlorite, the raw materials that is used for adding various raw materials adds the device, stores the storage device of sodium hypochlorite and handles the exhaust treatment device of waste gas in the production, its characterized in that: the waste gas treatment device comprises a reaction kettle, the reaction kettle is arranged in layers, a containing cavity made of a PTFE film and a spray head arranged below the containing cavity are arranged at a middle separation position, the PTFE film can only pass through gas, the waste gas is connected with a gas inlet at the lower layer of the reaction kettle, NaOH solution enters the containing cavity made of the PTFE film and is sprayed and added into the lower layer of the reaction kettle by the spray head, a gas outlet is arranged at the upper layer of the reaction kettle, the gas outlet is connected with a three-way pipe, a first outlet of the three-way pipe is connected with the gas outlet of the reaction kettle, a second outlet of the three-way pipe is connected with a gas backflow hole of the reaction kettle, the gas backflow hole is positioned at the lower layer of the reaction kettle, a check valve is arranged in a pipeline between the reaction kettle and a second outlet of the three-way pipe, a pipeline connected with a third outlet of the three-, hollow intraduct hollow department is provided with rotatable one-way separation blade just the air current rear of one-way separation blade is provided with the hollow post of dysmorphism extrusion that the one-way separation blade of cooperation used, the hollow post central point of dysmorphism extrusion puts and is provided with the centre bore that supplies the air current to pass through, the hollow post upper end of dysmorphism extrusion is connected transparent test paper and is observed the box, set up the moist starch KI test paper of a long section in the transparent test paper observation box, moist starch KI test paper can the pull in the transparent test paper observation box.

2. The electrolytic sodium hypochlorite generator system according to claim 1, wherein the lower layer of the reaction kettle of the waste gas treatment device is connected with an alkali liquor circulation tank and provided with an alkali liquor cooling auxiliary device, the alkali liquor circulation tank comprises a caustic soda addition port and a solution addition port for preparing alkali liquor, the alkali liquor cooling auxiliary device comprises water cooling pipelines laid on the outer wall of the alkali liquor circulation tank and the outer wall of the reaction kettle, a water inlet of the water cooling pipeline is connected with a cold water source, a water outlet of the water cooling pipeline is connected with a storage tank, when the temperature of cooling water in the water cooling pipeline is higher than 35 ℃, an ice water mixture is added through the water inlet of the water cooling pipeline, a plurality of water discharging switches are arranged in the water cooling pipeline, and the water discharging switches are independently arranged and do not.

3. The electrolytic sodium hypochlorite generator system according to claim 1, wherein a cleaning knife is arranged at an electrode plate of the electrolytic generator, the cleaning knife is made of acrylic materials, the cleaning knife is connected with a motor through a rotating shaft, two sides of the electrode plate are tightly attached to the cleaning knife, the cleaning knife is in an arc-shaped structure, two cleaning knives are arranged on one side of the cleaning knife, and the two sides of the cleaning knife are in synchronous operation.

4. A method for producing sodium hypochlorite by electrolysis, for use in an electrolytic sodium hypochlorite generator system as claimed in any one of claims 1 to 3, comprising the steps of:

(1) preparing a solution by connecting the soft water production apparatus to a tap water line and adding the produced soft water to a bath salt generator, wherein the solution preparation in the bath salt generator includes: the soft water production device adopts a membrane separation method to produce soft water for the seed solution, the produced soft water is injected into a water inlet of the bath salt production device, meanwhile, the prepared high-concentration salt water is synchronously added at a feed inlet, and the mixed solution is mixed in the bath salt production device to produce salt water for electrolysis in the subsequent step;

(2) and (2) conducting the saline solution obtained in the step (1) to an electrolysis generating device through a pipeline, wherein the electrolysis generating device carries out electrolysis on the solution, and the electrolysis process comprises the following steps:

anode: 2Cl^--2e→Cl₂

Cathode: 2Na⁺+2H₂O+2e→H₂+2NaOH

In the solution: cl₂+2NaOH→NaCl+NaClO+H₂O

And (3) total reaction: NaCl + H₂O→NaClO+H₂

(3) Collecting solution, namely collecting the sodium hypochlorite solution obtained in the step (2) to a storage device through a pipeline, and guiding waste gas generated in the production process to a waste gas treatment device;

(4) and (3) treating the waste gas collected in the step (3), including treating hydrogen and chlorine, enabling the waste gas to pass through a configured NaOH solution, then passing through a detection three-way pipe through an air inlet of an air pump, connecting an air outlet of a waste gas treatment device, arranging wet starch KI test paper on the three-way pipe connected with the air outlet, arranging a stop valve behind the wet starch KI test paper, detecting whether the chlorine is completely removed according to whether the wet starch KI test paper on the three-way pipe is blue, opening the stop valve when the wet starch KI test paper is not blue, enabling the hydrogen to pass through the air pump, collecting the hydrogen to a hydrogen collection device, and continuously closing the stop valve to enable the gas to flow back to continue the process of removing the chlorine under the condition that the chlorine is not completely removed.

5. An electrolytic process for the production of sodium hypochlorite according to claim 4, wherein the percentage concentration of NaOH solution in step (4) is 16-18%.

6. The method for producing sodium hypochlorite by electrolysis according to claim 4, wherein, in the process of collecting the hydrogen gas in the step (4) into the hydrogen gas collecting device, nitrogen gas is injected by synchronous blowing in the collecting device according to the injection ratio of the hydrogen gas to the nitrogen gas of more than 1:10, and an explosion-proof membrane is arranged at the top of the collecting device, and the direction of the explosion-proof membrane is vertically upward.

7. The method for producing sodium hypochlorite by electrolysis according to claim 4, wherein the concentration of the salt solution used for electrolysis in step (1) is 3-5%.

Images