Pulverized coal gasification device and process for producing high heating value coal gas with low carbon residue content

Patent metadata

Field	Value
Publication number	US-11220642-B2
Application number	US-201816466810-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Aug 8, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A pulverized coal gasification device and process for producing high heating value coal gas with low carbon residue content includes a U-shaped coal gas generation furnace and a coal gas-semicoke separating device, and the U-shaped coal gas generation furnace consists of two section structures including high-temperature and low-temperature sections which are arranged in a U-shaped manner; the high-temperature section and the low-temperature section share an ash hopper; the high-temperature section is a downward entrained-flow bed, and the low-temperature section is an upward entrained-flow bed; and an inlet of the coal gas separating device is connected to the outlet of the low-temperature section, a solid outlet of the coal gas separating device is connected to an inlet of the high-temperature section, and a gas outlet of the coal gas separating device is connected to a coal gas waste heat utilizing and purifying system. The coal utilization rate can be greatly increased.

First claim

What is claimed is:

1. A pulverized coal gasification device for producing high heating value coal gas with low carbon residue content, wherein, comprising a U-shaped coal gas generation furnace and a coal gas-semicoke separating device, wherein the U-shaped coal gas generation furnace comprises two section structures namely a high-temperature section and a low-temperature section which are arranged in a U-shaped manner; the high-temperature section and the low-temperature section share an ash hopper; the high-temperature section is a downward entrained-flow bed, and the low-temperature section is an upward entrained-flow bed; and an inlet of the coal gas-semicoke separating device is connected to an outlet of the low-temperature section, a solid outlet of the coal gas separating device is connected to an inlet of the high-temperature section, and a gas outlet of the coal gas separating device is connected to a coal gas waste heat utilizing and purifying system;
wherein the low-temperature section comprises a low-temperature section furnace body, a position where the low-temperature section furnace body is connected to the high-temperature section is a low-temperature section throat, an oxygen\air nozzle is arranged at a lower end of the low-temperature section throat, and low-temperature section pulverized coal nozzles are arranged at an upper end of the low-temperature section throat.

2. The pulverized coal gasification device for producing the high heating value coal gas with the low carbon residue content according to claim 1 , wherein the low-temperature section furnace body is further provided with a microwave reforming device.

3. The pulverized coal gasification device for producing the high heating value coal gas with the low carbon residue content according to claim 1 , wherein the low-temperature section pulverized coal nozzles are of single-channel structures.

4. The pulverized coal gasification device for producing the high heating value coal gas with the low carbon residue content according to claim 1 , wherein a feeding mode of the low-temperature section pulverized coal nozzles is a pneumatic conveying mode, and a conveying medium is nitrogen or hot smoke; and a number of the low-temperature section pulverized coal nozzles is two, and the two low-temperature section pulverized coal nozzles are arranged oppositely.

5. The pulverized coal gasification device for producing the high heating value coal gas with the low carbon residue content according to claim 1 , wherein a feeding mode of the low-temperature section pulverized coal nozzles is a chute mode.

6. The pulverized coal gasification device for producing the high heating value coal gas with the low carbon residue content according to claim 1 , wherein the high-temperature section comprises a high-temperature section furnace body, a water-cooled wall is arranged on an outer side of the high-temperature section furnace body, and a high-temperature section pulverized coal nozzle is arranged on the top of the high-temperature section furnace body.

7. The pulverized coal gasification device for producing the high heating value coal gas with the low carbon residue content according to claim 6 , wherein the high-temperature section pulverized coal nozzle has a three-channel structure, and the three-channel structure comprises a central material feeding layer, an outer pure oxygen feeding layer, and an outermost water vapor feeding layer.

8. A pulverized coal gasification process based on the pulverized coal gasification device for producing high heating value coal gas with the low carbon residue content of claim 1 , comprising:
step 1: gasifying raw materials through pure oxygen in a high-temperature section to generate high-temperature coal gas at a temperature from 1300° C. to 1600° C.; wherein the raw materials comprise semicoke which is not gasified completely at the low-temperature section, coal fly ash and raw pulverized coal;
step 2: enabling the high-temperature coal gas generated in step 1 to enter the low-temperature section, tempering the high-temperature coal gas via air/oxygen, enabling the high-temperature coal gas and the raw pulverized coal which is sprayed by the low-temperature section pulverized coal nozzles to move upwards together and carrying out thermal decomposition and gasification reaction on the high-temperature coal gas and the raw pulverized coal to obtain coal gas with high content of hydrocarbons substances and semicoke which is not gasified completely, wherein a gasification temperature of a low temperature section is 900° C. to 1100° C.; and
step 3, separating the coal gas from the semicoke obtained in step 2, feeding the coal gas into a coal gas waste heat utilizing and purifying system, and collecting and feeding the semicoke into the high-temperature section and gasifying the semicoke at a high temperature; and also feeding coal fly ash which is collected by the coal gas waste heat utilizing and purifying system into the high-temperature section and gasifying the coal fly ash at a high temperature.

Assignees

• Univ Shandong

Inventors

• Ma Chunyuan
• Wang Tao
• Zhou Binxuan
• Zhang Zhen
• Fu Jiapeng
• Zhang Liqiang
• Zhao Xiqiang
• Cheng Xingxing

Classifications

• C10J3/506 Primary

  for entrained flow gasifiers · CPC title

• C10J3/721

  Multistage gasification, e.g. plural parallel or serial gasification stages · CPC title

• Y02P20/129

  Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines · CPC title

• C10J2300/1609

  Post-reduction, e.g. on a red-white-hot coke or coal bed · CPC title

• C10J2300/093

  Coal · CPC title