Method for treating petrochemical VOCs waste gas by utilizing sulfur recovery device incineratorTechnical Field
The invention relates to a method for treating hydrocarbon-containing waste gas in petrochemical enterprises.
Background
VOCs are short for volatile organic compounds, and mainly comprise non-methane organic matters and the like. Most VOCs have toxicity characteristics and are harmful to human health; while the product of its atmospheric chemical reaction is an important component in fine particulate matter and also an important precursor that leads to gray haze weather. It can be seen that VOCs have very important promotion effect on the formation of composite atmospheric pollution.
At present, domestic VOCs waste gas mainly adopts combustion technology, and is handled through dedicated VOCs waste gas device, has the extravagant not enough of energy consumption.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for treating petrochemical VOCs waste gas by utilizing an incinerator of a sulfur recovery device. The tail gas can be synchronously treated while the incinerator is used for treating the waste gas which is difficult to degrade and contains hydrocarbon.
The technical scheme adopted for solving the technical problems is as follows: a method for treating petrochemical VOCs waste gas by utilizing a sulfur recovery device incinerator is characterized by comprising the following steps of
The burner is connected with a fuel gas feeding pipe;
the incinerator is integrally arranged with the burner and is connected with a secondary air feeding pipe and a tail gas feeding pipe;
the waste gas mixer is connected with a waste gas feeding pipe; and
A primary air feed pipe connected to the burner via the exhaust gas mixer;
The fuel gas enters the burner from the fuel gas feeding pipe, the primary air enters from the primary air feeding pipe, and enters the burner after being mixed with hydrocarbon-containing waste gas in the waste gas mixer, and the fuel gas are combusted in the burner to provide heat for the incinerator;
The sulfur tail gas enters the incinerator from the tail gas feeding pipe, the secondary air enters the incinerator from the secondary air feeding pipe, the sulfur tail gas and the secondary air are burnt in the incinerator, and after burning, the sulfur tail gas and the secondary air are discharged through a smoke discharge port of the incinerator, and the combustion temperature of the combustor is not lower than 1500 ℃.
Further, the flame port of the burner is not less than 5m from the secondary air injection port.
In order to control the combustion temperature, a temperature detection device is arranged in the incinerator, and the fuel gas feeding pipe and the primary air feeding pipe are respectively arranged on a fuel gas valve and a primary air valve which are in linkage control with the temperature detection device.
Further, a check valve for preventing air from entering the waste gas feeding pipe is arranged on the waste gas feeding pipe.
Further, the waste gas feeding pipe is provided with a waste gas valve and a differential pressure gauge which is in linkage control with the waste gas valve.
Compared with the prior art, the invention has the advantages that: through the collaborative design of the burner, the incinerator and the waste gas mixer of the sulfur recovery device, firstly, hydrocarbon-containing waste gas is mixed with primary air, and injected into the high-temperature section of the burner, and the purpose of hydrocarbon-containing waste gas treatment is achieved through the high-temperature combustion of fuel gas. Meanwhile, the heat is used for burning of the incinerator, and the original tail gas treatment function of the incinerator is reserved. The combination of the two can save energy consumption, can meet the requirements of flue gas emission, and has the advantages of low technical transformation cost, stable operation and easy popularization.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, the method for treating petrochemical VOCs exhaust gas by using the sulfur recovery apparatus incinerator 2 in the present embodiment involves a burner 1, an incinerator 2 and an exhaust gas mixer 3.
The burner 1 is connected with a fuel gas feeding pipe 11; the incinerator 2 is arranged integrally with the burner 1 and is connected with a secondary air feed pipe 22 and a tail gas feed pipe 21; the exhaust gas mixer 3 is connected with an exhaust gas feed pipe 31; the primary air feed pipe 13 is connected to the burner 1 after passing through the exhaust gas mixer 3; the fuel gas enters the burner 1 from the fuel gas feeding pipe 11, the primary air enters from the primary air feeding pipe 13, and enters the burner 1 after being mixed with the waste gas in the waste gas mixer 3, and the mixture is burnt with the fuel gas in the burner 1 to provide heat for the incinerator 2; the sulfur tail gas enters the incinerator 2 from the tail gas feeding pipe 21, the secondary air enters the incinerator 2 from the secondary air feeding pipe 22, the sulfur tail gas and the secondary air are burnt in the incinerator 2, and after burning, the sulfur tail gas is discharged through a smoke discharge port of the incinerator 2, and the combustion temperature of the combustor 1 is not lower than 1500 ℃. The flame port of the burner 1 is not less than 5m from the secondary air injection port, the secondary air is added too close, nitrogen oxides are easily generated under the condition of peroxy, and the distance limitation is one measure for ensuring low nitrogen oxide emission.
The flame port of the burner 1 is not less than 5m from the secondary air injection port. The incinerator 2 is internally provided with a temperature detection device 23, and the fuel gas feeding pipe 11 and the primary air feeding pipe 13 are respectively arranged on a fuel gas valve 12 and a primary air valve 15 which are controlled in linkage with the temperature detection device 23. The exhaust gas feed pipe 31 is provided with a check valve 33 for preventing air from entering the exhaust gas feed pipe 31. The waste gas feed pipe 31 is provided with a waste gas valve 32 and a differential pressure gauge 34 which is in linkage control with the waste gas valve 32.
The waste gate 32 and the non-return valve 33 are used to prevent the material in the primary air feed pipe 13 from flowing back into the waste air. Ensure that the hydrocarbon-containing waste gas and the sulfur tail gas can be completely combusted.
The main component of the waste gas is air, wherein NMHC is less than or equal to 1000ppmv.
Flue gas emission index: NOx≤50mg/Nm3,NMHC≤20mg/Nm3 in the flue gas meets the requirement of environmental protection emission.
The incinerator is applied to tail gas treatment of a sulfur recovery device, is mainly used for treating H2 S-containing waste gas after CLAUS sulfur production, adopts a thermal incineration technology to convert H2 S in the waste gas into SO2, and directly discharges the incinerated flue gas into the atmosphere through a high-altitude chimney. Through research and transformation of the tail gas incinerator process technology, some hydrocarbon-containing waste gas generated in the petroleum refining production process is sent to a combustor for treatment, so that VOCs waste gas treatment can be realized, and the environment-friendly emission requirement is met.