CN101928605A - Treatment method of slurry carbon residue - Google Patents
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- CN101928605A CN101928605ACN2010102552179ACN201010255217ACN101928605ACN 101928605 ACN101928605 ACN 101928605ACN 2010102552179 ACN2010102552179 ACN 2010102552179ACN 201010255217 ACN201010255217 ACN 201010255217ACN 101928605 ACN101928605 ACN 101928605A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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Abstract
Translated fromChineseDescription
Translated fromChinese发明领域field of invention
本发明涉及一种浆状残碳的处理方法，具体地，本发明涉及一种对碳质材料与超临界水反应所产生的浆状残碳进行处理的方法。The invention relates to a method for treating slurry-like carbon residues, in particular, the invention relates to a method for treating slurry-like carbon residues produced by the reaction of carbonaceous materials and supercritical water.
背景技术Background technique
煤气化技术是当前洁净，高效煤炭利用的最主要途径，也是当前能源高新技术发展的关键环节之一。当前比较成熟的煤气化工艺包括鲁奇气化工艺，Shell气化工艺以及GE(Texaco)气化工艺等。出于气化速率的考虑，这些气化工艺的共同特点是气化温度通常在1000℃以上，合成气组成主要是CO和H2。这些气化过程由于煤的气化温度很高，碳转化率也很高，基本不存在残碳问题。Coal gasification technology is the most important way of clean and efficient coal utilization, and it is also one of the key links in the development of high-tech energy. Currently relatively mature coal gasification processes include Lurgi gasification process, Shell gasification process and GE (Texaco) gasification process. Considering the gasification rate, the common features of these gasification processes are that the gasification temperature is usually above 1000°C, and the composition of the syngas is mainly CO and H2 . Due to the high gasification temperature of coal and the high carbon conversion rate in these gasification processes, there is basically no carbon residue problem.
对于以水煤浆为原料的碳质材料催化气化制取合成气或甲烷的流程来说，由于碳质材料的催化气化在较低的温度例如水的超临界温度如至多650℃下进行，反应速率势必低于其在1000℃以上的高温下相应的煤气化技术，反应的进行程度也相应降低，因而部分碳质材料未能充分反应，故产物中不可避免地有一部分残碳即未反应完全的碳质材料，并且这部分残碳与水和灰渣(即碳质材料中的矿物质成份，一般不可燃)形成混合物，该混合物一般称为浆状残碳。如何有效利用这部分浆状残碳，是提高煤催化气化整个工艺流程的能效的一个重要方面。For the process of producing synthesis gas or methane by catalytic gasification of carbonaceous materials using coal water slurry as raw material, since the catalytic gasification of carbonaceous materials is carried out at a lower temperature such as the supercritical temperature of water, such as at most 650 ° C , the reaction rate is bound to be lower than the corresponding coal gasification technology at a high temperature above 1000°C, and the progress of the reaction is correspondingly reduced, so some carbonaceous materials cannot fully react, so there is inevitably a part of residual carbon in the product that is not Completely reacted carbonaceous materials, and this part of residual carbon forms a mixture with water and ash (ie, the mineral components in carbonaceous materials, which are generally non-combustible). This mixture is generally called slurry carbon residue. How to effectively utilize this part of slurry carbon residue is an important aspect to improve the energy efficiency of the entire process of coal catalytic gasification.
对于这样浆状残碳的处理，通常的处理过程是通过泵将浆状残碳送至压滤机压滤出其中的水分，之后利用外部热源对残碳进行干燥，干燥后的残碳送往锅炉焚烧。这样的过程需要耗费大量的能量，且流程复杂。For the treatment of such slurry carbon residue, the usual treatment process is to send the slurry carbon residue to the filter press to filter out the water through the pump, and then use an external heat source to dry the carbon residue, and the dried carbon residue is sent to Boiler burning. Such a process consumes a large amount of energy and is complicated.
另一种常规的处理方法是填埋，但填埋法则显然没有有效利用这些残碳，且不利于环境保护。Another conventional treatment method is landfill, but the landfill method obviously does not effectively utilize these residual carbons and is not conducive to environmental protection.
发明概述Summary of the invention
本发明提供了一种对浆状残碳进行处理的方法，包括以下步骤：使所述浆状残碳在处于亚临界状态或超临界状态下的水中与过量氧气发生反应，其中所述过量氧气是指氧气的量多于使残碳刚好完全氧化所需的氧气的量。The invention provides a method for treating slurry carbon residue, comprising the following steps: making the slurry carbon residue react with excess oxygen in water in a subcritical state or a supercritical state, wherein the excess oxygen It means that the amount of oxygen is more than the amount of oxygen required to completely oxidize the carbon residue.
本发明还提供了一种提高碳质材料与超临界水反应的能量效率的方法，包括以下步骤：The present invention also provides a method for improving the energy efficiency of carbonaceous material and supercritical water reaction, comprising the following steps:
a使碳质材料与超临界水以及任选的氧化剂在催化剂的存在下发生反应，生成包含甲烷的气体，并产生包含水和残碳的浆状残碳；a reacting the carbonaceous material with supercritical water and optionally an oxidizing agent in the presence of a catalyst to generate a gas comprising methane and to produce a slurry of carbon residue comprising water and carbon residue;
b将所述包含甲烷的气体与所述包含水和残碳的浆状残碳分离开；b separating said gas comprising methane from said slurry comprising water and carbon residue;
c使所述浆状残碳在处于亚临界状态或超临界状态下的水中与过量氧气发生反应，其中所述过量氧气是指氧气的量多于使残碳刚好完全氧化所需的氧气的量；c making the slurry carbon residue react with excess oxygen in water in a subcritical or supercritical state, wherein the excess oxygen means that the amount of oxygen is more than the amount of oxygen needed to completely oxidize the carbon residue ;
d将步骤c中的反应所放出的热量中的至少一部分用于预热步骤a中的碳质材料和水。d using at least a part of the heat released by the reaction in step c to preheat the carbonaceous material and water in step a.
附图简述Brief description of the drawings
图1是本发明的示例性的实施方案的工艺流程图。Figure 1 is a process flow diagram of an exemplary embodiment of the present invention.
发明详述Detailed description of the invention
本发明中的浆状残碳是包含残碳、灰渣以及大量水的混合物，通常，其中的残碳含量为10-30重量％，灰渣含量为20-30重量％，水的含量为50-60重量％。余量为催化剂，其含量一般为1-3重量％。Slurry carbon residue in the present invention is a mixture comprising carbon residue, ash residue and a large amount of water. Usually, the carbon residue content is 10-30% by weight, the ash residue content is 20-30% by weight, and the water content is 50% by weight. -60% by weight. The balance is catalyst, and its content is generally 1-3% by weight.
本发明中的浆状残碳可来自于碳质材料与超临界水的反应。其中所述碳质材料包括但不限于煤、生物质或它们的混合物。其中煤可包括各种煤，例如烟煤、无烟煤、泥煤、褐煤等。其中生物质为直接或间接衍生自生物体的物质，例如谷物、秸秆、木材、藻类、植物油以及动物脂肪等。通常将碳质材料粉碎至一定粒度例如200目(0.074mm)之后，加入分散剂及稳定剂等与水配成浆。例如，在碳质材料为煤的情况下，形成水煤浆。然后在水的超临界状态下在催化剂的存在下在气化炉中发生反应而制备包含甲烷的气体产物。该反应也称作甲烷化反应。其中所述催化剂包括但不限于碱金属或碱土金属的氧化物、碱金属或碱土金属的氢氧化物、碱金属或碱土金属盐或它们的混合物，例如K2O、Na2O、CaO、MgO、NaOH、KOH、Ca(OH)2、Mg(OH)2、K2CO3和Na2CO3，或由它们组成的混合物。The slurry carbon residue in the present invention can come from the reaction of carbonaceous material and supercritical water. Wherein said carbonaceous material includes but not limited to coal, biomass or their mixture. The coal may include various coals, such as bituminous coal, anthracite, peat, lignite and the like. Biomass refers to substances derived directly or indirectly from living organisms, such as grains, straws, wood, algae, vegetable oils, and animal fats. Usually, after the carbonaceous material is crushed to a certain particle size such as 200 mesh (0.074mm), a dispersant and a stabilizer are added with water to form a slurry. For example, when the carbonaceous material is coal, a coal water slurry is formed. The reaction then takes place in the gasifier in the presence of a catalyst in the supercritical state of water to produce a gaseous product comprising methane. This reaction is also called methanation reaction. Wherein the catalyst includes but not limited to oxides of alkali metals or alkaline earth metals, hydroxides of alkali metals or alkaline earth metals, salts of alkali metals or alkaline earth metals or mixtures thereof, such as K2 O, Na2 O, CaO, MgO , NaOH, KOH, Ca(OH)2 , Mg(OH)2 , K2 CO3 and Na2 CO3 , or a mixture thereof.
为了提高甲烷产率，通常向反应混合物中通入氧化剂例如过氧化氢、含氧气体或纯氧气等。其中含氧气体可为富氧空气或普通空气或任何其它含有氧气的气体等。碳质材料与超临界水以及任选的氧化剂发生反应后，将得到的反应后混合物进行换热而降低到水的超临界温度以下(例如降低到约350℃)，然后进入分离装置，将气体产物与浆状残碳分离开。本发明要处理的浆状残碳即可为这种浆状残碳。In order to increase the yield of methane, an oxidizing agent such as hydrogen peroxide, oxygen-containing gas or pure oxygen is usually introduced into the reaction mixture. The oxygen-containing gas can be oxygen-enriched air or ordinary air or any other oxygen-containing gas. After the carbonaceous material reacts with supercritical water and an optional oxidant, the resulting reacted mixture is subjected to heat exchange to reduce it below the supercritical temperature of water (for example, to about 350° C.), and then enter the separation device to separate the gas The product is separated from the slurry carbon residue. The slurry carbon residue to be treated in the present invention can be such slurry carbon residue.
所述浆状残碳也可以是以水煤浆为原料的工业锅炉、工业窑炉中发生的不完全燃烧所产生的。The slurry-like carbon residue can also be produced by incomplete combustion in industrial boilers and industrial kilns using coal-water slurry as raw material.
本发明的处理浆状残碳的方法在于包括以下步骤：使所述浆状残碳在处于亚临界状态或超临界状态下的水中与过量氧气发生反应，其中所述过量氧气是指氧气的量多于使残碳刚好完全氧化所需的氧气的量。The method for processing slurry carbon residue of the present invention is to comprise the following steps: make described slurry carbon residue react with excess oxygen in water under subcritical state or supercritical state, wherein said excess oxygen refers to the amount of oxygen The amount of oxygen in excess of that required to just completely oxidize the carbon residue.
上述步骤一般在氧化反应器中进行。将浆状残碳引入氧化反应器中，同时向该氧化反应器中通入过量氧气。氧气可以以纯氧气或富氧空气或普通空气等方式提供。在过量氧气的存在下，残碳基本上被完全氧化生成CO2，同时放出热量并加热浆状残碳中的水，从而使该氧化反应器的温度升高至水的亚临界状态或超临界状态，并在该状态下使残碳与氧气持续反应。当然，也可以独立地由其它热源将该氧化反应器的温度升高至水的亚临界状态或超临界状态。反应所放出的热量中的一小部分用于弥补因反应器散热而导致的热损失，以维持反应器本身的温度在期望的温度水平上，大部分热量则可回收利用，例如用于预热水煤浆，或者用于产生蒸汽进行发电。这种热量回收方法是本领域技术人员公知的。The above steps are generally carried out in an oxidation reactor. Slurry carbon residue is introduced into the oxidation reactor, and excess oxygen is passed into the oxidation reactor at the same time. Oxygen can be provided in the form of pure oxygen or oxygen-enriched air or ordinary air. In the presence of excess oxygen, the carbon residue is substantially completely oxidized to CO2 , while releasing heat and heating the water in the slurry carbon residue, thereby raising the temperature of the oxidation reactor to the subcritical or supercritical state of water state, and in this state, the residual carbon and oxygen are continuously reacted. Of course, the temperature of the oxidation reactor can also be raised independently from other heat sources to the subcritical or supercritical state of water. A small part of the heat released by the reaction is used to make up for the heat loss caused by the heat dissipation of the reactor to maintain the temperature of the reactor itself at the desired temperature level, and most of the heat can be recycled, such as for preheating Coal water slurry, or used to generate steam for power generation. Such heat recovery methods are well known to those skilled in the art.
所述氧化反应器可以为管式反应器或流化床反应器。浆状残碳和氧气可以并流通入反应器中，也可以逆流通入反应器中。浆状残碳与氧气的进料质量流量比可为1∶1.5至1∶3。The oxidation reactor may be a tubular reactor or a fluidized bed reactor. Slurry carbon residue and oxygen can flow into the reactor in parallel or in countercurrent flow into the reactor. The feed mass flow ratio of slurry carbon residue and oxygen can be 1:1.5 to 1:3.
其中所述水的亚临界状态是指这样的状态：温度在水的常压沸点以上且在水的临界温度以下而压力为使水保持为液态的压力。例如，水的亚临界状态可以为绝对压力10-22MPa且温度为120-374℃的状态。Wherein the subcritical state of water refers to a state in which the temperature is above the boiling point of water at normal pressure and below the critical temperature of water and the pressure is such that water remains in a liquid state. For example, the subcritical state of water may be a state with an absolute pressure of 10-22 MPa and a temperature of 120-374°C.
其中所述水的超临界状态是指绝对压力在22.1MPa以上且温度在374℃以上。Wherein the supercritical state of water means that the absolute pressure is above 22.1MPa and the temperature is above 374°C.
另一方面，本发明还涉及一种提高碳质材料气化反应的能量效率的方法，包括以下步骤：On the other hand, the present invention also relates to a method for improving the energy efficiency of the gasification reaction of carbonaceous materials, comprising the following steps:
a使碳质材料与超临界水以及任选的氧化剂在催化剂的存在下发生反应，生成包含甲烷的气体，并产生包含水和残碳的浆状残碳；a reacting the carbonaceous material with supercritical water and optionally an oxidizing agent in the presence of a catalyst to generate a gas comprising methane and to produce a slurry of carbon residue comprising water and carbon residue;
b将所述包含甲烷的气体与所述包含水和残碳的浆状残碳分离开；b separating said gas comprising methane from said slurry comprising water and carbon residue;
c使所述浆状残碳在处于亚临界状态或超临界状态下的水中与过量氧气发生反应；c making the slurry carbon residue react with excess oxygen in water in a subcritical state or a supercritical state;
d将步骤c中的反应所放出的热量中的至少一部分用于预热步骤a中的碳质材料和水。d using at least a part of the heat released by the reaction in step c to preheat the carbonaceous material and water in step a.
在上述方法的步骤a中，通过使水与碳质材料混合形成的浆料例如水煤浆通入到气化炉中，并将该气化炉的温度提高至水的超临界状态，同时以任何本领域技术人员已知的方式向气化炉中引入催化剂，例如将催化剂溶解于水煤浆中并随水煤浆一起引入气化炉中，或者单独地将催化剂水溶液引入到气化炉中，并任选地向该气化炉中通入氧化剂，来促使发生碳质材料的气化反应。其中所述氧化剂和催化剂如上所述。其中，碳质材料的浆料和/或水在进入气化炉之前都要进行加压以及预热，例如加压并预热至接近或达到水的超临界状态，以使这些物料一进入气化炉就能发生反应。该反应产生包含甲烷的气体，并产生包含水和残碳的浆状残碳。反应后的物料仍处于水的超临界状态。In step a of the above method, the slurry formed by mixing water and carbonaceous materials, such as coal-water slurry, is passed into the gasifier, and the temperature of the gasifier is increased to the supercritical state of water, and at the same time Any method known to those skilled in the art to introduce the catalyst into the gasifier, such as dissolving the catalyst in the coal-water slurry and introducing it into the gasifier together with the coal-water slurry, or introducing the catalyst aqueous solution into the gasifier separately , and optionally feed an oxidant into the gasifier to promote the gasification reaction of the carbonaceous material. Wherein the oxidizing agent and catalyst are as described above. Among them, the slurry of carbonaceous materials and/or water must be pressurized and preheated before entering the gasifier, for example, pressurized and preheated to be close to or reach the supercritical state of water, so that these materials enter the gasifier The furnace reacts. This reaction produces a gas comprising methane and produces a slurry of carbon residue comprising water and carbon residue. The reacted material is still in the supercritical state of water.
在上述方法的步骤b中，将所述包含甲烷的气体与所述包含水和残碳的浆状残碳分离开。这种分离过程可使用本领域技术人员已知的任何方法来进行。例如，在本发明的优选实施方案中，通过用冷却介质对所述包含甲烷的气体和所述包含水和残碳的浆状残碳进行冷却并回收热量，由此使反应后的物料的温度降低，例如降低至水的超临界温度以下以使水变成以液体形式存在，由此使所述包含甲烷的气体和所述包含水和残碳的浆状残碳分离开来。为了提高系统的能量效率，优选用要进入步骤a的气化炉的碳质材料的浆料或用于配制碳质材料的浆料的水来作为所述冷却介质，以冷却所述包含甲烷的气体和所述包含水和残碳的浆状残碳，这样做的好处是同时也实现对碳质材料的浆料进行预热的目的。In step b of the above method, the gas comprising methane is separated from the slurry comprising water and carbon residues. This isolation process can be carried out using any method known to those skilled in the art. For example, in a preferred embodiment of the present invention, by using a cooling medium to cool the gas containing methane and the slurry carbon residue containing water and carbon residue and recover heat, the temperature of the reacted material is thus made The reduction, eg, below the supercritical temperature of water, causes the water to become present in liquid form, thereby separating the gas comprising methane and the slurry comprising water and carbon residue. In order to improve the energy efficiency of the system, it is preferable to use the slurry of the carbonaceous material that will enter the gasifier in step a or the water used to prepare the slurry of the carbonaceous material as the cooling medium to cool the gasifier containing methane The gas and the slurry carbon residue containing water and carbon residue have the advantage of achieving the purpose of preheating the slurry of carbonaceous materials at the same time.
在上述方法的步骤c中，使所述浆状残碳在处于亚临界状态或超临界状态下的水中与过量氧气发生反应。该反应一般在氧化反应器中进行。将浆状残碳引入氧化反应器中，同时向该氧化反应器中通入过量氧气。氧气可以以纯氧气或富氧空气或普通空气等方式提供。在过量氧气的存在下，残碳基本上被完全氧化生成CO2，同时放出热量并加热浆状残碳中的水，从而使该氧化反应器的温度升高至水的亚临界状态或超临界状态，并在该状态下使残碳与氧气持续反应。当然，也可以独立地由其它热源将该氧化反应器的温度升高至水的亚临界状态或超临界状态。反应后，固体物质中基本上只剩下灰渣，而碳质材料中的碳得到了几乎100％的转化。In the step c of the above method, the slurry carbon residue is reacted with excess oxygen in water in a subcritical state or a supercritical state. The reaction is generally carried out in an oxidation reactor. Slurry carbon residue is introduced into the oxidation reactor, and excess oxygen is passed into the oxidation reactor at the same time. Oxygen can be provided as pure oxygen or oxygen-enriched air or normal air. In the presence of excess oxygen, the carbon residue is substantially completely oxidized to CO2 , while releasing heat and heating the water in the slurry carbon residue, thereby raising the temperature of the oxidation reactor to the subcritical or supercritical state of water state, and in this state, the residual carbon and oxygen are continuously reacted. Of course, it is also possible to raise the temperature of the oxidation reactor to the subcritical or supercritical state of water independently from other heat sources. After the reaction, basically only ash remained in the solid matter, while the carbon in the carbonaceous material was almost 100% converted.
在上述方法的步骤d中，将步骤c中的反应所放出的热量中的至少一部分用于预热步骤a中的碳质材料和水。在稳态下，步骤c中的反应所放出的热量中的一小部分用于弥补因反应器散热而导致的热损失，以维持反应器本身的温度在期望的温度水平上，大部分热量则可回收利用，例如用于预热水煤浆，或者用于产生蒸汽进行发电。这种热量回收方法是本领域技术人员公知的。In step d of the above method, at least a part of the heat released by the reaction in step c is used to preheat the carbonaceous material and water in step a. In the steady state, a small part of the heat released by the reaction in step c is used to make up for the heat loss caused by the heat dissipation of the reactor to maintain the temperature of the reactor itself at the desired temperature level, and most of the heat is Can be recycled, for example for preheating hot coal slurry, or for generating steam for power generation. Such heat recovery methods are well known to those skilled in the art.
本发明的方法具有以下优点：The method of the present invention has the following advantages:
在亚临界水或超临界水中用过量氧气对残碳进行氧化，实现了残碳的再利用，提高了碳利用率，并对氧化过程所产生的热量进行回收用于加热水煤浆，对氧化后的气体进行换热所回收的热量可以部分补偿用于提高水煤浆温度的热量，提高了能量利用率，使系统能效的利用更加合理。将本发明的方法与碳质材料的催化气化工艺结合使用时，实现了碳质材料几乎完全的利用，提高了物质利用率和能效。Use excess oxygen in subcritical water or supercritical water to oxidize residual carbon, realize the reuse of residual carbon, improve carbon utilization rate, and recover the heat generated in the oxidation process for heating coal-water slurry, which is beneficial to oxidation The heat recovered by the heat exchange of the final gas can partially compensate the heat used to increase the temperature of the coal-water slurry, which improves the energy utilization rate and makes the utilization of the energy efficiency of the system more reasonable. When the method of the invention is used in combination with the catalytic gasification process of carbonaceous materials, almost complete utilization of carbonaceous materials is realized, and the material utilization rate and energy efficiency are improved.
与背景技术部分中所述的传统的浆状残碳处理方法相比，本发明的方法节省了压滤和干燥步骤，节约了相关的设备和能量消耗，且不污染环境。Compared with the traditional slurry carbon residue treatment method described in the background technology section, the method of the present invention saves steps of filtration and drying, saves related equipment and energy consumption, and does not pollute the environment.
实施例Example
给出以下非限制性实施例来举例说明本发明的方法。The following non-limiting examples are given to illustrate the method of the invention.
该实施例的流程如图1所示。以烟煤催化气化为例，烟煤经过破碎机粉碎研磨制成粒度小于150微米的煤粉，然后与催化剂Na2CO3(用量为煤粉质量的10％)和水一起经过湿式研磨机处理而制备成煤粉浓度为40重量％的水煤浆。水煤浆经加压，预热达到23MPa、550℃后进入气化炉，同时依靠高压氧气泵向气化炉中通入氧气，在气化炉中部分水煤浆与加入的氧气反应，将温度提升至650℃。在水的超临界状态下，煤与水在催化剂的作用下发生反应，生成富含甲烷的粗合成气。合成气的主要成分为甲烷，一氧化碳，二氧化碳，氢气等。出气化炉的反应后的混合物包括粗合成气、超临界水、未反应的残碳以及反应后残渣。该反应后的混合物与来自加压泵的23MPa的加压水在换热器中换热产生高温高压蒸汽，该高温高压蒸汽进入蒸汽透平进行发电。该反应后的混合物则被冷却至水的超临界温度以下(例如约350℃)，然后进入分离器，将粗合成气与包含水、灰渣和残碳的混合物(即浆状残碳)分离，分离后的粗合成气进入后续处理单元。浆状残碳则输送到氧化反应器中。向该氧化反应器中通入过量氧气，并依靠残碳与氧气的氧化反应放出的热量将该氧化反应器内的温度和压力均升至水的亚临界状态或超临界状态。氧化反应持续进行，生成CO2和H2O，反应所产生的热量用于预热水煤浆或产生蒸汽，灰渣则排出氧化反应器，用作建筑材料。The flow of this embodiment is shown in FIG. 1 . Taking the catalytic gasification of bituminous coal as an example, the bituminous coal is pulverized and ground by a crusher to make coal powder with a particle size of less than 150 microns, and then it is treated with a catalyst Na2 CO3 (the amount is 10% of the mass of the coal powder) and water through a wet grinder. A coal-water slurry with a pulverized coal concentration of 40% by weight is prepared. After being pressurized and preheated to 23MPa and 550°C, the coal-water slurry enters the gasifier. At the same time, oxygen is fed into the gasifier by means of a high-pressure oxygen pump. In the gasifier, part of the coal-water slurry reacts with the added oxygen, and the The temperature was raised to 650°C. In the supercritical state of water, coal and water react under the action of a catalyst to produce crude synthesis gas rich in methane. The main components of syngas are methane, carbon monoxide, carbon dioxide, hydrogen, etc. The reacted mixture exiting the gasifier includes crude syngas, supercritical water, unreacted carbon residues and residues after reaction. The reacted mixture exchanges heat with 23MPa pressurized water from a pressurization pump in a heat exchanger to generate high-temperature and high-pressure steam, and the high-temperature and high-pressure steam enters a steam turbine for power generation. The reacted mixture is cooled below the supercritical temperature of water (for example, about 350°C), and then enters the separator to separate the crude syngas from the mixture containing water, ash and carbon residue (ie, slurry carbon residue) , the separated crude synthesis gas enters the subsequent processing unit. Slurry carbon residue is transported to the oxidation reactor. Pass excess oxygen into the oxidation reactor, and rely on the heat released by the oxidation reaction of residual carbon and oxygen to raise the temperature and pressure in the oxidation reactor to the subcritical state or supercritical state of water. The oxidation reaction continues to generate CO2 and H2 O. The heat generated by the reaction is used to preheat the hot coal slurry or generate steam, and the ash is discharged from the oxidation reactor and used as building materials.
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