Dry quenching gas regulation method of coal internal heat low temperature pyrolysis

Abstract

The invention discloses a dry quenching gas regulation method of coal internal heat low temperature pyrolysis. The method comprises: performing tar separation and collection to gas which is generated from a pyrolysis segment through pyrolysis, returning a part of cool purified gas to a quenching segment, allowing heat transfer to be carried out between hot semi-coke in the quenching segment and the part of cool purified gas to reduce the temperature of semi-coke to a non-reignition temperature, and discharging the hot gas; leading the hot gas after heat transfer from the quenching segment to the pyrolysis segment; leading a combustion-supporting gas from micropores of a lattice wall or a gas distribution channel to the pyrolysis segment, allowing the combustion-supporting gas to meet the hot gas for combustion; and mixing high-temperature gas produced from combustion with uncombusted hot gas to form high-temperature mixed gas meeting the temperature and flow of low temperature pyrolysis requirements, and performing heat transfer between the high-temperature mixed gas and coal in the pyrolysis segment so as to carry out coal pyrolysis. According to the method, in a situation that the circulating gas amount in the pyrolysis segment is basically kept constant, the gas circulating amount in the quenching segment is further increased, so that the quenching effect is ensued, and the physical heat of semi-coke can be fully used, and therefore, the energy saving effect is good. According to the method, since no dependent combustor, combustion gas blower fan, pipeline or valve is required, so that the system is further simplified.

Description

technical field

[0001] The invention relates to the technical fields of coal chemical industry, new energy and environmental protection, and in particular to a coke dry quenching gas control method of internal thermal low-temperature dry distillation of coal. Background technique

[0002] my country's Shanxi, Shaanxi, Ningxia and Inner Mongolia regions are rich in low-metamorphic coal resources. This type of coal is weakly sticky and non-sticky coal with high volatile content and high tar content. Low-temperature dry distillation can obtain gas and semi-coke while separating tar. (Semi-coke), which is an effective method for quality-based comprehensive utilization or coal upgrading, has developed rapidly in recent years. According to reports, in Shanxi, Shaanxi, Ningxia and Inner Mongolia, as well as Xinjiang, Yunnan and Guizhou, the production capacity can reach more than 60 million tons / a, and it has become the main coal conversion industry in these places.

[0003] For se...

Examples

Embodiment 1

[0054] Embodiment 1: the application of annual processing 600,000 tons semi-coke production plant

[0055] (1) Basic information:

[0056] The semi-coke production plant with an annual processing capacity of 600,000 tons adopts a vertical square furnace as the basic production equipment, air-assisted combustion, and a coal-to-coke ratio of 1.65:1. The tar yield is about 8%, and the combustion and circulation gas volume is 549Nm 3 / t 兰炭 , the amount of combustion air into the furnace is 190m 3 / t 兰炭 , the amount of gas used for drying is 100Nm 3 / t 兰炭 , the remaining gas volume per ton of coal is 460Nm 3 / t 兰炭 About (Shenmu dry-based raw coal as the benchmark), gas calorific value 6771-7106kJ / Nm 3 . The reference gas composition is as follows:

[0057] h 2 : 16.2%, CO: 14.49%, CO 2 : 7.41%, CH 4 : 5.68%, Nitrogen: 50.10%. Calorific value: 7029kJ / m 3 .

[0058] (2) Application method

[0059] Applied as figure 2 shown. Renovate the original retort furnace, in...

Embodiment 2

[0064] Embodiment 2: the application of the semi-coke production plant with an annual output of 600,000 tons

[0065] (1) Basic information

[0066] The semi-coke production plant with an annual processing capacity of 600,000 tons uses a vertical square furnace as the basic production equipment, with oxygen-enriched air for combustion, an oxygen-enriched ratio of 80%, a coal-to-coke ratio of 1.65:1, and a tar yield of about 8%. Combustion and circulating gas volume 619m 3 / t 兰炭 , the amount of oxygen-enriched air into the furnace is 100m 3 / t 兰炭 , the amount of gas used for drying is 100Nm 3 / t 兰炭 , the remaining gas volume per ton of coal is 260Nm 3 / t 兰炭 Around, gas calorific value 13102kJ / Nm 3 . The reference gas composition is as follows:

[0067] h 2 : 35.05%, CO 23.04%, CO 2 : 12.06%, CH 4 : 12.55%, Nitrogen: 9.85%. Calorific value of gas 13102kJ / m 3 .

[0068] (2) Application method

[0069] The application method is basically the same as Example 1. Re...

Embodiment 3

[0072] Embodiment 3: the application of the semi-coke production plant with an annual output of 1.2 million tons

[0073] (1) Basic information

[0074] The vertical square furnace is used as the basic production equipment, and the air with an oxygen-enriched ratio of 30% is used for combustion. It has been modified and installed with a CDQ device. The coal-to-coke ratio is 1.67:1, the tar yield is about 7.6%, and the moisture content of semi-coke is 1.5~ 2.0%, no drying process. Combustion and circulating gas volume 861Nm 3 / t 兰炭 , the amount of combustion air into the furnace is 136m 3 / t 兰炭 , surplus gas volume 532m 3 / t 兰炭 , gas calorific value 9231.0-9342.8kJ / Nm 3 .

[0075] (2) Application method

[0076] The combustion gas fans, pipelines and regulating valves were stopped, the burners were canceled, and the fire path (flower wall) was remodeled to use small-hole ventilation bricks. Appropriately reduce the amount of combustion air. The specific application met...

technical field

[0001] The invention relates to the technical fields of coal chemical industry, new energy and environmental protection, and in particular to a coke dry quenching gas control method of internal thermal low-temperature dry distillation of coal. Background technique

[0002] my country's Shanxi, Shaanxi, Ningxia and Inner Mongolia regions are rich in low-metamorphic coal resources. This type of coal is weakly sticky and non-sticky coal with high volatile content and high tar content. Low-temperature dry distillation can obtain gas and semi-coke while separating tar. (Semi-coke), which is an effective method for quality-based comprehensive utilization or coal upgrading, has developed rapidly in recent years. According to reports, in Shanxi, Shaanxi, Ningxia and Inner Mongolia, as well as Xinjiang, Yunnan and Guizhou, the production capacity can reach more than 60 million tons / a, and it has become the main coal conversion industry in these places.

[0003] For se...

Examples

Embodiment 1

[0054] Embodiment 1: the application of annual processing 600,000 tons semi-coke production plant

[0055] (1) Basic information:

[0056] The semi-coke production plant with an annual processing capacity of 600,000 tons adopts a vertical square furnace as the basic production equipment, air-assisted combustion, and a coal-to-coke ratio of 1.65:1. The tar yield is about 8%, and the combustion and circulation gas volume is 549Nm 3 / t 兰炭 , the amount of combustion air into the furnace is 190m 3 / t 兰炭 , the amount of gas used for drying is 100Nm 3 / t 兰炭 , the remaining gas volume per ton of coal is 460Nm 3 / t 兰炭 About (Shenmu dry-based raw coal as the benchmark), gas calorific value 6771-7106kJ / Nm 3 . The reference gas composition is as follows:

[0057] h 2 : 16.2%, CO: 14.49%, CO 2 : 7.41%, CH 4 : 5.68%, Nitrogen: 50.10%. Calorific value: 7029kJ / m 3 .

[0058] (2) Application method

[0059] Applied as figure 2 shown. Renovate the original retort furnace, in...

Embodiment 2

[0064] Embodiment 2: the application of the semi-coke production plant with an annual output of 600,000 tons

[0065] (1) Basic information

[0066] The semi-coke production plant with an annual processing capacity of 600,000 tons uses a vertical square furnace as the basic production equipment, with oxygen-enriched air for combustion, an oxygen-enriched ratio of 80%, a coal-to-coke ratio of 1.65:1, and a tar yield of about 8%. Combustion and circulating gas volume 619m 3 / t 兰炭 , the amount of oxygen-enriched air into the furnace is 100m 3 / t 兰炭 , the amount of gas used for drying is 100Nm 3 / t 兰炭 , the remaining gas volume per ton of coal is 260Nm 3 / t 兰炭 Around, gas calorific value 13102kJ / Nm 3 . The reference gas composition is as follows:

[0067] h 2 : 35.05%, CO 23.04%, CO 2 : 12.06%, CH 4 : 12.55%, Nitrogen: 9.85%. Calorific value of gas 13102kJ / m 3 .

[0068] (2) Application method

[0069] The application method is basically the same as Example 1. Re...

Embodiment 3

[0072] Embodiment 3: the application of the semi-coke production plant with an annual output of 1.2 million tons

[0073] (1) Basic information

[0074] The vertical square furnace is used as the basic production equipment, and the air with an oxygen-enriched ratio of 30% is used for combustion. It has been modified and installed with a CDQ device. The coal-to-coke ratio is 1.67:1, the tar yield is about 7.6%, and the moisture content of semi-coke is 1.5~ 2.0%, no drying process. Combustion and circulating gas volume 861Nm 3 / t 兰炭 , the amount of combustion air into the furnace is 136m 3 / t 兰炭 , surplus gas volume 532m 3 / t 兰炭 , gas calorific value 9231.0-9342.8kJ / Nm 3 .

[0075] (2) Application method

[0076] The combustion gas fans, pipelines and regulating valves were stopped, the burners were canceled, and the fire path (flower wall) was remodeled to use small-hole ventilation bricks. Appropriately reduce the amount of combustion air. The specific application met...

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