Coal gasification co-production powdered carbon treatment system

Abstract

The utility model discloses a coal gasification co-production powdered carbon treatment system which comprises a gasification furnace, a cyclone separator, a return feeder, an exhaust system and a carbon discharge system, a smoke outlet of the gasification furnace is connected with the cyclone separator, and a powdered carbon outlet of the cyclone separator is connected to a powdered carbon inlet of the gasification furnace through the return feeder. A coal gas outlet of the cyclone separator is connected with an exhaust system; and a carbon discharge outlet at the middle lower part of the cyclone separator is connected with a carbon discharge system. The carbon discharging system is additionally arranged behind the cyclone separator, powdered carbon is obtained through matching of the ash cooler and the ash cooler bin pump, the powdered carbon can be sold as a powdered activated carbon raw material, the purpose of resource integration and utilization can be achieved, different requirements of the market for activated carbon are met, meanwhile, economic benefits of coal gasification enterprises are increased, and waste is turned into wealth.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gasification process, in particular to a coal gasification combined production and pulverized carbon treatment system. Background Art

[0002] Circulating fluidized bed coal gasification technology is a clean coal gas production technology, which has a high magnification material circulation loop and the reaction materials in the furnace have a long residence time. Because of its wide coal type adaptability, uniform temperature distribution in the furnace, high gasification reaction rate and other characteristics, it has been widely used in industrial gas, synthetic ammonia and other green chemical fields.

[0003] In the conventional circulating fluidized bed coal gasification process, due to the limitations of the process technology itself, a certain amount of powdered coal particles are entrained in the coal gas. These powdered coal particles are usually collected by dry dust removal and treated as solid waste, and their economic value utilization rate is relatively low. Summary of the Utility Model

[0004] The applicant of the present utility model aims at the above-mentioned disadvantages existing in the existing coal gasification process, provides a coal gasification combined production and pulverized carbon treatment system with reasonable structure, increases sampling and carbon discharging measures, distributes the output of coal gas and pulverized carbon, and improves economic benefits.

[0005] The technical solution adopted by the present utility model is as follows:

[0006] A coal gasification combined production and pulverized carbon treatment system includes a gasifier, a cyclone separator, a return feeder, an exhaust system and a carbon discharging system. The flue gas outlet of the gasifier is connected to the cyclone separator. The pulverized carbon outlet of the cyclone separator is connected to the pulverized carbon inlet of the gasifier through the return feeder. The coal gas outlet of the cyclone separator is connected to the exhaust system. The carbon discharging outlet in the middle and lower part of the cyclone separator is connected to the carbon discharging system.

[0007] As a further improvement of the above technical solution:

[0008] The carbon discharging system includes a cold ash cooler, a cold ash cooler bin pump and a carbon powder storage bin connected in sequence. The cold ash cooler is connected to the carbon discharging outlet of the cyclone separator.

[0009] A sampling valve is arranged between the cold ash cooler and the cold ash cooler bin pump; the circulation ratio of the gasifier is adjusted according to the sampling analysis structure of the sampling valve.

[0010] The exhaust system includes a waste heat boiler and a bag filter connected in sequence. The coal gas outlet of the cyclone separator is connected to the waste heat boiler. The clean coal gas outlet of the bag filter is connected to the clean gas to the boundary area.

[0011] The pulverized carbon outlet of the bag filter is connected to the dust collector bin pump, and the dust collector bin pump is connected to the carbon discharging system.

[0012] The cold ash cooler bin pump and the dust collector bin pump adopt pneumatic conveying and dense-phase conveying, and the conveying gas is inert gas.

[0013] A wind distribution device is arranged in the gasifier. The gasifying agent of the gasifier can be one, two or a combination of air, air + steam, oxygen-enriched air / pure oxygen + steam, and CO2; the temperature of the gasifier is 900 - 1100 °C, the temperature at the top of the gasifier is 800 - 1000 °C, and the temperature of the high-temperature coal gas at the outlet of the gasifier is 900 - 1100 °C; the raw coal of the gasifier includes lignite, long-flame coal, non-caking bituminous coal, weakly caking bituminous coal and anthracite.

[0014] The return feeder adopts a high-throughput U-shaped self-balancing return device.

[0015] The cold ash cooler is made of high-temperature resistant stainless steel or carbon steel lined with refractory materials, and the cold ash cooler is provided with a powder cleaning system and a nitrogen cannon plugging removal device.

[0016] The bag filter is provided with a collector cylinder body, filter bags, bag cages, a powder cleaning system, a conical hopper, a nitrogen cannon plugging removal device, and an electric control.

[0017] The beneficial effects of the present utility model are as follows:

[0018] The present utility model adds a carbon discharge system after the cyclone separator. The powder carbon is obtained through the cooperation of the cold ash cooler and the cold ash cooler bin pump. The powder carbon can be sold as raw material for powdered activated carbon, which can achieve the purpose of resource integration and utilization, meet the different demands of the market for activated carbon, and at the same time increase the economic benefits of the coal gasification enterprise, realizing turning waste into treasure. A sampling valve is arranged between the cold ash cooler and the cold ash cooler bin pump. The powder carbon is collected through the sampling valve, and its parameters such as composition, particle size distribution, carbon content, etc. are analyzed. According to the analysis results, the circulation ratio of the gasifier is adjusted, which can better optimize the coal gasification production, allocate the output of coal gas and powder carbon, ensure the highest comprehensive economic value of the products produced, and improve the economic benefits. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the present utility model.

[0020] In the figure: 1. Gasifier; 2. Cyclone separator; 3. Return feeder; 4. Waste heat boiler; 5. Cold ash cooler; 6. Sampling valve; 7. Cold ash cooler bin pump; 8. Bag filter; 9. Dust collector bin pump; 10. Carbon powder storage bin. Detailed Embodiments

[0021] The following combines with the drawings to illustrate the detailed embodiments of the present utility model.

[0022] As Figure 1As shown in the figure, the utility model includes a gasifier 1, a cyclone separator 2, a return feeder 3, an exhaust system and a carbon discharge system. The flue gas outlet at the top of the gasifier 1 is connected to the cyclone separator 2. The fine carbon outlet at the bottom of the cyclone separator 2 is connected to the fine carbon inlet of the gasifier 1 through the return feeder 3. The gas outlet at the top of the cyclone separator 2 is connected to the exhaust system. The carbon discharge outlet in the middle and lower part of the cyclone separator 2 is connected to the carbon discharge system. Raw coal is input into the gasifier 1, and a coal gasification reaction occurs under the action of a gasifying agent to obtain a coal gasification product, which is a mixture of coal gas at a first set temperature and fine carbon. The coal gasification product is sent to the cyclone separator 2 for separation. The obtained coal gas enters the exhaust system for exhaust treatment. Part of the obtained fine carbon returns to the gasifier 1 through the return feeder 3, and part enters the carbon discharge system for carbon discharge treatment.

[0023] The exhaust system includes a waste heat boiler 4 and a bag filter 8 connected in sequence. The gas outlet of the cyclone separator 2 is connected to the waste heat boiler 4. The clean gas outlet of the bag filter 8 is connected to the clean gas going to the battery limit. The fine carbon outlet of the bag filter 8 is connected to a dust collector bin pump 9, and the dust collector bin pump 9 is connected to the carbon discharge system. The waste heat boiler 4 is used to cool the coal gas at the first set temperature to obtain coal gas at a second set temperature, and at the same time generate saturated steam or superheated steam. The generated steam can be used as a gasifying agent and an oxygen deaerator for the gasifier 1, and the surplus steam is sent outside the battery limit.

[0024] The carbon discharge system includes a cold ash cooler 5, a sampling valve 6, a cold ash bin pump 7 and a carbon powder storage bin 10 connected in sequence. The cold ash cooler 5 is connected to the carbon discharge outlet of the cyclone separator 2. The cold ash cooler 5 is used to cool the fine carbon discharged from the cyclone separator 2 to obtain fine carbon at a third temperature. The sampling valve 6 is used to collect the fine carbon at the third temperature and analyze the content and quality of the fine carbon. According to the analysis results, the circulation ratio of the gasifier 1 is adjusted, so as to optimize the coal gasification production, allocate the output of coal gas and fine carbon, ensure the highest comprehensive economic value of the produced products, and improve economic benefits. The cold ash bin pump 7 is used to transport the fine carbon at the third temperature cooled by the cold ash cooler 5 to the carbon powder storage bin 10. The dust collector bin pump 9 is connected to the carbon powder storage bin 10 and is used to transport the fine carbon collected by the bag filter 8 to the carbon powder storage bin 10. The fine carbon capture efficiency of the cyclone separator 2 can reach 90%, and the fine carbon capture efficiency of the bag filter 8 can reach more than 99%. The cold ash bin pump 7 and the dust collector bin pump 9 adopt pneumatic conveying, dense-phase conveying, and the conveying gas adopts inert gases such as nitrogen or carbon dioxide.

[0025] The gasifying agent of the gasifier 1 can be one, two or a combination of more of air, air + steam, oxygen-enriched air / pure oxygen + steam, and CO2. A wind distribution device is provided inside the gasifier 1, which can evenly distribute the air, steam, etc. entering the furnace from the bottom of the gasifier 1 in the furnace, making the furnace temperature uniform and ensuring the temperature of the gasifier 1 and the reaction efficiency of the gasification reaction. The temperature of the gasifier 1 is 900 - 1100 °C, the temperature at the top of the gasifier 1 is 800 - 1000 °C, and the temperature of the high-temperature coal gas at the outlet of the gasifier 1 is 900 - 1100 °C. The raw coal of the gasifier 1 can be directly prepared using pulverized coal, and the raw coal includes lignite, long-flame coal, non-caking bituminous coal, weakly caking bituminous coal, anthracite, etc.

[0026] The return feeder 3 adopts a high-throughput U-shaped self-balancing return device, forming a high-circulation ratio external circulation loop with the gasifier 1 and the cyclone separator 2, which can effectively reduce the carbon content in the waste residue.

[0027] The cold ash cooler 5 is made of high-temperature resistant stainless steel or carbon steel lined with refractory materials, and the cold ash cooler 5 is provided with structures such as a powder cleaning system and a nitrogen cannon plugging removal device.

[0028] The bag filter 8 is provided with structures such as a collector cylinder body, filter bags, bag cages, a powder cleaning system, a conical hopper, a nitrogen cannon plugging removal device, and an electric control system.

[0029] In the present utility model, a carbon discharging system is added after the cyclone separator 2. The powder carbon is obtained through the cooperation of the cold ash cooler 5 and the cold ash silo pump 7. The powder carbon can be sold as raw material for powdered activated carbon, which can achieve the purpose of resource integration and utilization, meet different market demands for activated carbon, increase the economic benefits of the coal gasification enterprise, and turn waste into treasure. A sampling valve 6 is arranged between the cold ash cooler 5 and the cold ash silo pump 7. The powder carbon is sampled through the sampling valve 6, and parameters such as its composition, particle size distribution, and carbon content are analyzed. According to the analysis results, the circulation ratio of the gasifier 1 is adjusted, which can better optimize the coal gasification production, allocate the production of coal gas and powder carbon, ensure the highest comprehensive economic value of the products produced, and improve the economic benefits.

[0030] The above description is an explanation of the present utility model, not a limitation of the present utility model. Without departing from the spirit of the present utility model, the present utility model can be modified in any form.

Claims

1. A coal gasification co-production pulverized carbon processing system, characterized in that: The invention comprises a gasifier (1), a cyclone separator (2), a return device (3), an exhaust system and a carbon exhaust system, wherein the smoke outlet of the gasifier (1) is connected to the cyclone separator (2), the pulverized carbon outlet of the cyclone separator (2) is connected to the pulverized carbon inlet of the gasifier (1) through the return device (3), the coal gas outlet of the cyclone separator (2) is connected to the exhaust system, and the carbon exhaust outlet at the middle and lower part of the cyclone separator (2) is connected to the carbon exhaust system.

2. The coal gasification co-production pulverized carbon processing system according to claim 1, characterized in that: The carbon discharge system comprises an ash cooler (5), an ash cooler bin pump (7) and a carbon powder storage bin (10) which are connected in sequence, and the ash cooler (5) is connected to the carbon discharge outlet of the cyclone separator (2).

3. The coal gasification co-production pulverized carbon processing system according to claim 2, characterized in that: A sampling valve (6) is provided between the ash cooler (5) and the ash cooler bin pump (7); the circulation rate of the gasifier (1) is adjusted according to the sampling and analysis structure of the sampling valve (6).

4. The coal gasification co-production pulverized carbon processing system according to claim 1, characterized in that: The exhaust system comprises a waste heat boiler (4) and a bag filter (8) which are connected in sequence, the gas outlet of the cyclone separator (2) is connected to the waste heat boiler (4), and the clean gas outlet of the bag filter (8) is connected to the clean gas delimiting area.

5. The coal gasification co-production pulverized carbon processing system according to claim 4, characterized in that: The powdered carbon outlet of the bag filter (8) is connected to the filter bin pump (9), and the filter bin pump (9) is connected to the carbon exhaust system.

6. The coal gasification co-production pulverized carbon processing system according to claim 2 or 5, characterized in that: The ash cooler bin pump (7) and the dust collector bin pump (9) adopt pneumatic conveying and dense phase conveying, and the conveying gas adopts inert gas.

7. The coal gasification co-production pulverized carbon processing system according to claim 1, characterized in that: An air distribution device is provided in the gasifier (1). The temperature of the gasifier (1) is 900-1100° C., the temperature of the top of the gasifier (1) is 800-1000° C., and the temperature of the high-temperature coal gas at the outlet of the gasifier (1) is 900-1100° C.

8. The coal gasification co-production pulverized carbon processing system according to claim 1, characterized in that: The return device (3) adopts a high-throughput U-shaped self-balancing return device.

9. The coal gasification co-production pulverized carbon processing system according to claim 1, characterized in that: The ash cooler (5) is made of high temperature resistant stainless steel or carbon steel lined with refractory material. The ash cooler (5) is provided with a powder cleaning system and a nitrogen gun clearing device.

10. The coal gasification co-production pulverized carbon processing system according to claim 1, characterized in that: The bag filter (8) is provided with a collector cylinder, filter bags, bag cages, a powder cleaning system, a conical hopper, a nitrogen cannon clearing device, and an electronic control system.

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