阅读说明：本技术 一种水煤浆气化制甲醇装置一氧化碳变换联产电能系统及方法 (Carbon monoxide conversion co-production electric energy system and method for device for preparing methanol by gasifying coal water slurry ) 是由 兰荣亮 谢东升 马炯 汪根宝 王靓 于 2020-05-20 设计创作，主要内容包括：本发明属于煤制甲醇装置工艺节能优化和余热利用技术领域,提供一种水煤浆气化制甲醇装置一氧化碳变换联产电能系统及方法。结合工厂余热回收利用技术,优化和搭建工艺流程,提出在煤化工生产工艺装置中,通过引入余热发电机组,用于回收利用变换过程的反应热,满足一氧化碳变换反应转化率要求的同时获得电能,并具有能量集成效果好、节能降耗显著、余热利用效率高等特点。(The invention belongs to the technical field of energy-saving optimization and waste heat utilization of a process of a device for preparing methanol from coal, and provides a system and a method for carbon monoxide conversion and co-production of electric energy of a device for preparing methanol from coal water slurry gasification. The method combines the waste heat recycling technology of a factory, optimizes and builds the process flow, provides a method for recycling the reaction heat in the conversion process by introducing the waste heat generator set in the coal chemical production process device, meets the requirement of the conversion rate of the carbon monoxide conversion reaction and simultaneously obtains electric energy, and has the characteristics of good energy integration effect, obvious energy saving and consumption reduction, high waste heat utilization efficiency and the like.)

1. The utility model provides a coal slurry gasification system methyl alcohol device carbon monoxide transform coproduction electric energy system which characterized in that: the system comprises a first gas-liquid separator (1), a second gas-liquid separator (6), a third gas-liquid separator (8) and a fourth gas-liquid separator (11); the output pipeline of the crude synthesis gas is connected with a first gas-liquid separator (1), and the output end at the top of the first gas-liquid separator (1) is divided into two paths: one path of the gas-liquid separation device is connected with the input end of a detoxification groove (3) through a crude gas preheater (2), the output end of the bottom of the detoxification groove (3) is connected with the input end of the top of a shift converter (4), the output end of the bottom of the shift converter (4) is connected with a first generator (5) through the crude gas preheater (2), the other path of the gas-liquid separation device is connected with the outlet end of the first generator set (5) and then enters a second gas-liquid separator (6), the output end of the top of the second gas-liquid separator (6) is connected with a third gas-liquid separator (8) through a second generator (7), the third gas-liquid separator (8) enters a fourth gas-liquid separator (11) through a desalted water preheater (9) and a water cooler (10), and the output end of the top of the fourth gas-liquid separator (11) is delivered.

2. The carbon monoxide shift co-production electric energy system of the coal water slurry gasification methanol preparation device according to claim 1, characterized in that: the first generator (5) is connected with the first generator set in a matching way; and the second generator (7) is connected with the third generator set in a matching way.

3. The carbon monoxide shift co-production electric energy system of the coal water slurry gasification methanol preparation device according to claim 1, characterized in that: the method is characterized in that: the detoxification tank (3) and the shift converter (4) are heat-insulating fixed bed reactors.

4. The carbon monoxide shift co-production electric energy system of the coal water slurry gasification methanol preparation device according to claim 2, characterized in that: the first generator set and the second generator set are kalina cycle or Rankine cycle.

5. A method for realizing carbon monoxide shift co-production of electric energy of a device for preparing methanol by gasifying coal water slurry by using the system of claim 1 is characterized in that: the method comprises the following steps:

1) after crude synthesis gas from an upstream coal water slurry gasification device enters a first gas-liquid separator, the top gas phase is divided into two gas streams, wherein one process gas stream is heated by a crude gas preheater and then enters a detoxification tank to remove impurities, and then enters a shift converter to carry out carbon monoxide shift reaction;

2) the temperature of the outlet of the shift converter is 390-430 ℃, the shift converter is cooled to 350-380 ℃ through a raw gas preheater, and then the raw gas enters a first generator to drive a first generator set to obtain electric energy;

3) the temperature of the converted gas is further reduced to 210-230 ℃, the converted gas is mixed with another unconverted gas and enters a second gas-liquid separator, and after a liquid phase is separated at the bottom, a top gas phase enters a second generator to drive a second generator set to obtain electric energy;

4) the gas generated by the power generation and cooled to 160-185 ℃ by the second generator enters a third gas-liquid separator, the separated gas phase is cooled by a desalted water preheater and a water cooler and then enters a fourth gas-liquid separator, and the gas discharged from the fourth gas-liquid separator is sent out;

5) and bottom condensate of the second gas-liquid separator and the third gas-liquid separator is merged and then sent out, and bottom condensate of the fourth gas-liquid separator is sent out for further treatment.

6. The method for co-production of electric energy by carbon monoxide shift of the device for preparing methanol by gasifying coal water slurry according to claim 5, characterized in that: the flow rate of the crude synthesis gas at the top outlet of the first gas-liquid separator (1) as the unchanged gas is 0.4-0.6.

7. The method for co-production of electric energy by carbon monoxide shift of the device for preparing methanol by gasifying coal water slurry according to claim 5, characterized in that: the inlet temperature of the detoxification tank (3) and the inlet temperature of the shift converter (4) are controlled to be 260-300 ℃.

8. The method for co-production of electric energy by carbon monoxide shift of the device for preparing methanol by gasifying coal water slurry according to claim 5, characterized in that: the operating temperature of the first gas-liquid separator is controlled to be 240-250 ℃, the operating temperature of the second gas-liquid separator is controlled to be 210-230 ℃, the operating temperature of the third gas-liquid separator is controlled to be 160-185 ℃, and the operating temperature of the fourth gas-liquid separator is controlled to be 35-40 ℃.

Technical Field

The invention belongs to the technical field of energy-saving optimization and waste heat utilization of a coal-to-methanol device, relates to a carbon monoxide conversion cogeneration system and a carbon monoxide conversion cogeneration method for a coal-water-slurry gasification methanol device, and is industrial application of a waste heat power generation technology in a coal chemical device.

Background

In order to strengthen the application of the energy-saving technology of the coal-to-methanol device, the waste heat power generation technology is adopted to optimize the technical route of the device, so that the device has the comprehensive benefits of high energy utilization efficiency, increased power supply and the like. In a coal-to-methanol device, the content of CO in the raw synthesis gas from an upstream coal water slurry gasification device is high, and CO needs to react with water and be converted into CO through a carbon monoxide conversion catalytic reaction₂And H₂The process gas composition is adjusted so that it satisfies the condition of f ═ H₂-CO₂)/(CO+CO₂) 2.0-2.15, and then entering a methanol synthesis device.

The carbon monoxide shift reaction belongs to a strong exothermic reaction and is a thermodynamically controlled process. The recovery of a large amount of reaction heat in the carbon monoxide conversion process is realized by arranging a plurality of heat exchangers, by-producing medium and low pressure steam, preheating boiler feed water, heating desalted water, cooling circulating water and the like. Most of the by-produced steam is low in grade and energy utilization rate, and a large amount of generated redundant steam is often discharged in an emptying manner, so that great waste of energy is caused.

Disclosure of Invention

The invention aims to provide a carbon monoxide conversion co-production electric energy system and a carbon monoxide conversion co-production electric energy method for a device for preparing methanol by gasifying coal water slurry, aiming at the defects in the prior art. The process flow is optimized and set up by combining the waste heat recycling technology of a factory, the reaction heat in the conversion process is recycled by introducing the waste heat generator set in the coal chemical production process device, the process production requirements are met, meanwhile, electric energy is obtained, and the device has the characteristics of good energy integration effect, remarkable energy saving and consumption reduction, high waste heat utilization efficiency and the like.

The purpose of the invention can be realized by the following technical scheme:

a carbon monoxide conversion cogeneration electric energy system of a device for preparing methanol by gasifying coal water slurry comprises a first gas-liquid separator, a second gas-liquid separator, a third gas-liquid separator and a fourth gas-liquid separator; the output pipeline of the crude synthesis gas is connected with a first gas-liquid separator, and the output end at the top of the first gas-liquid separator is divided into two paths: one path of the raw gas preheater is connected with the input end of the detoxification groove, the output end of the bottom of the detoxification groove is connected with the input end of the top of the shift converter, the output end of the bottom of the shift converter is connected with the first generator through the raw gas preheater, the other path of the raw gas preheater is connected with the outlet end of the first generator set and then enters the second gas-liquid separator, the output end of the top of the second gas-liquid separator is connected with the third gas-liquid separator through the second generator, the third gas-liquid separator enters the fourth gas-liquid separator through the desalted water preheater and the water cooler, and the output end of the top of the fourth gas-liquid separator is sent out of the air.

In the above system: the first generator is connected with the first generator set in a matching way; and the second generator is matched and connected with the third generator set.

In the above system: the detoxification tank and the shift converter are heat-insulating fixed bed reactors.

In the above system: the first generator set and the second generator set are kalina cycle or Rankine cycle.

A method for realizing carbon monoxide conversion and cogeneration of electric energy of a device for preparing methanol by gasifying coal water slurry by using the system comprises the following steps:

1) after crude synthesis gas from an upstream coal water slurry gasification device enters a first gas-liquid separator, the top gas phase is divided into two gas streams, wherein one process gas stream is heated by a crude gas preheater and then enters a detoxification tank to remove impurities, and then enters a shift converter to carry out carbon monoxide shift reaction;

2) the temperature of the transformed gas at the outlet of the transforming furnace is 390-430 ℃ and is reduced to 350-380 ℃ through a raw gas preheater, and then the transformed gas enters a first generator to drive a first generator set to obtain electric energy;

3) the temperature of the converted gas is further reduced to 210-230 ℃, the converted gas is mixed with another unconverted gas and enters a second gas-liquid separator, and after a liquid phase is separated at the bottom, a top gas phase enters a second generator to drive a second generator set to obtain electric energy;

4) the gas generated by the power generation and cooled to 160-185 ℃ by the second generator enters a third gas-liquid separator, the separated gas phase is cooled by a desalted water preheater and a water cooler and then enters a fourth gas-liquid separator, and the gas discharged from the fourth gas-liquid separator is sent out;

5) and bottom condensate of the second gas-liquid separator and the third gas-liquid separator is merged and then sent out, and bottom condensate of the fourth gas-liquid separator is sent out for further treatment.

The method comprises the following steps: the flow rate of the crude synthesis gas at the top outlet of the first gas-liquid separator as the unchanged gas is 0.4-0.6.

The method comprises the following steps: and the inlet temperatures of the detoxification tank and the shift converter are controlled to be 260-300 ℃.

The method comprises the following steps: the operating temperature of the first gas-liquid separator is controlled to be 240-250 ℃, the operating temperature of the second gas-liquid separator is controlled to be 210-230 ℃, the operating temperature of the third gas-liquid separator is controlled to be 160-185 ℃, and the operating temperature of the fourth gas-liquid separator is controlled to be 35-40 DEG C

The invention has the beneficial effects that:

the method combines the waste heat recycling technology of a factory, optimizes and builds the process flow, provides a design idea of introducing the waste heat power generation technology in the production of the device for preparing methanol by gasifying water coal slurry, provides that a first circulating working medium generator set and a second circulating working medium generator set are connected in series in the carbon monoxide conversion process, effectively recycles the waste heat co-production electric energy in the carbon monoxide conversion process, and has the characteristics of good energy integration effect, high waste heat utilization efficiency, remarkable economic benefit and the like.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

In the figure: the system comprises a first gas-liquid separator 1, a crude gas preheater 2, a detoxification tank 3, a shift converter 4, a first generator 5, a second gas-liquid separator 6, a second generator 7, a third gas-liquid separator 8, a desalted water preheater 9, a water cooler 10 and a fourth gas-liquid separator 11.

Detailed Description

The invention is further illustrated by the following examples, without limiting the scope of the invention:

a carbon monoxide conversion cogeneration electric energy system and a method for a device for preparing methanol by gasifying coal water slurry comprise a first gas-liquid separator (1), a detoxification tank (3), a shift converter (4), a second gas-liquid separator (6), a third gas-liquid separator (8), a fourth gas-liquid separator (11), a first generator set (5) and a second generator set (7); the output pipeline of the crude synthesis gas is connected with a first gas-liquid separator (1), and the output end at the top of the first gas-liquid separator (1) is divided into two paths: one path is connected with the input end of the detoxification groove (3) through a crude gas preheater (2);

the output of detoxification groove (3) bottom links to each other with the input at shift converter (4) top, the output of shift converter (4) bottom passes through crude gas preheater (2) and links to each other with first generator (5), and another way gets into second vapour and liquid separator (6) after linking to each other with first generator system (5) exit end, the output at second vapour and liquid separator (6) top passes through second generator (7) and links to each other with third vapour and liquid separator (8), third vapour and liquid separator (8) get into fourth vapour and liquid separator (11) through demineralized water preheater (9) and water cooler (10). And the output end of the top of the fourth gas-liquid separator (11) is communicated with the outside.

The first generator (5) is connected with the first generator set in a matching way; and the second generator (7) is connected with the third generator set in a matching way.

The detoxification tank (3) and the shift converter (4) are heat-insulating fixed bed reactors.

The first generator set and the second generator set are Kalina Cycle (Kalina Cycle) or Rankine Cycle (Rankinecycle).