CN-224221031-U - System for recycling air in pulverized coal preparation process

Abstract

The utility model provides a recycling system of vented gas in a pulverized coal preparation process, which comprises a gas scrubber, a gas cooler, a gas-liquid separation tank, a gas compressor and a gas pressure reducing valve, wherein a gas inlet of the gas scrubber is used for being connected with a vented gas outlet of a pulverized coal preparation unit, a liquid inlet of the gas scrubber is connected with a washing water pipeline, the gas outlet of the gas scrubber is communicated with the gas inlet of the gas cooler, the gas outlet of the gas cooler is communicated with the inlet of the gas-liquid separation tank, the gas outlet of the gas-liquid separation tank is communicated with the inlet of the gas compressor, the outlet of the gas compressor is communicated with one end of the gas pressure reducing valve, and the other end of the gas pressure reducing valve is used for being connected with a sealing fan inlet of the pulverized coal preparation unit. The utility model not only improves the utilization efficiency of resources, but also reduces the influence on the environment.

Inventors

• ZHAO JINGUANG
• ZHAI LIFENG

Assignees

• 福建永荣科技有限公司

Dates

Publication Date

20260512

Application Date

20250529

Claims (6)

1. 1. The recycling system of the emptying gas in the coal dust preparation process is characterized by comprising a gas scrubber, a gas cooler, a gas-liquid separation tank, a gas compressor and a gas pressure reducing valve; the gas inlet of the gas scrubber is used for being connected with an emptying gas outlet of the pulverized coal preparation unit, the liquid inlet of the gas scrubber is connected with a washing water pipeline, the gas outlet of the gas scrubber is communicated with the gas inlet of the gas cooler, the gas outlet of the gas cooler is communicated with the inlet of the gas-liquid separation tank, the gas outlet of the gas-liquid separation tank is communicated with the inlet of the gas compressor, the outlet of the gas compressor is communicated with one end of the gas pressure reducing valve, and the other end of the gas pressure reducing valve is used for being connected with a sealing fan inlet of the pulverized coal preparation unit.
2. 2. The system for recycling of the blowdown gas in the pulverized coal production process according to claim 1, further comprising an exhaust line for connecting with the blowdown gas outlet of the pulverized coal production unit and a gas regulating valve on the exhaust line.
3. 3. The recycling system of the air in the coal dust preparation process according to claim 1, further comprising a water inlet switch valve, a low-pressure water pump, a water outlet switch valve and a settling tank, wherein a liquid outlet of the air scrubber is communicated with one end of the water inlet switch valve, the other end of the water inlet switch valve is communicated with an inlet of the low-pressure water pump, an outlet of the low-pressure water pump is communicated with one end of the water outlet switch valve, and the other end of the water outlet switch valve is communicated with an inlet of the settling tank.
4. 4. The recycling system of the discharged gas in the pulverized coal preparation process according to claim 1, wherein the cooling water inlet of the gas cooler is communicated with the cooling water inlet pipeline, and the cooling water outlet of the gas cooler is communicated with the cooling water outlet pipeline.
5. 5. The recycling system of the vented gas in the pulverized coal preparation process according to claim 1, further comprising a liquid regulating valve, wherein a condensate outlet of the gas-liquid separation tank is communicated with one end of the liquid regulating valve, and the other end of the liquid regulating valve is communicated with a water return port of the gas scrubber.
6. 6. The recycling system of the vented gas in the pulverized coal preparation process according to claim 1, further comprising a low pressure nitrogen tank, wherein the outlet of the gas compressor is communicated with the inlet of the low pressure nitrogen tank.

Description

System for recycling air in pulverized coal preparation process Technical Field The utility model relates to the technical field of chemical production, in particular to a recycling system of air in the preparation process of pulverized coal. Background In the current pulverized coal gasification process, the pulverized coal preparation link is important. The basic process is that raw coal is put into a coal mill for crushing, then dried by hot inert gas, and then the mixture of wind and coal powder is conveyed to a bag type dust collector by a circulating fan to realize wind-powder separation. The separated coal dust is sent to a subsequent working section through an ash conveying system, and about 20% of circulating air is directly discharged to the atmosphere at an outlet after being pressurized by a circulating fan, namely, the air is air, and the air usually contains water vapor, nitrogen, a small amount of coal dust and the like. The traditional treatment mode is often directly discharged into the atmosphere, which not only wastes available resources in the treatment mode, but also can cause certain pollution to the environment. Therefore, it is very necessary and significant to design a more efficient method for recycling the vent gas in the coal dust preparation process. Disclosure of utility model In order to solve the problems in the prior art, the utility model provides a recycling system of the vent gas in the coal dust preparation process, so as to recycle the vent gas. In order to achieve the above purpose, the utility model adopts the following technical scheme: In a first aspect, the utility model provides a recycling system of the discharged gas in the pulverized coal preparation process, which comprises a gas scrubber, a gas cooler, a gas-liquid separation tank, a gas compressor and a gas pressure reducing valve; the gas inlet of the gas scrubber is used for being connected with an emptying gas outlet of the pulverized coal preparation unit, the liquid inlet of the gas scrubber is connected with a washing water pipeline, the gas outlet of the gas scrubber is communicated with the gas inlet of the gas cooler, the gas outlet of the gas cooler is communicated with the inlet of the gas-liquid separation tank, the gas outlet of the gas-liquid separation tank is communicated with the inlet of the gas compressor, the outlet of the gas compressor is communicated with one end of the gas pressure reducing valve, and the other end of the gas pressure reducing valve is used for being connected with a sealing fan inlet of the pulverized coal preparation unit. The utility model has the beneficial effects that the emptying gas of the pulverized coal preparation unit is subjected to dust removal treatment, then cooled by the gas cooler and enters the gas-liquid separation tank, gas-water separation is completed, the separated gas is pressurized by the gas compressor, and then reduced in pressure by the gas reducing valve to a proper pressure and then is sent to the sealing fan inlet of the pulverized coal preparation unit, so that the gas is reused, the emptying gas is recycled, the resource utilization efficiency is improved, and the influence on the environment is reduced. Optionally, the pulverized coal preparation unit further comprises an exhaust pipeline and a gas regulating valve, wherein the exhaust pipeline is used for being connected with an emptying gas outlet of the pulverized coal preparation unit, and the gas regulating valve is positioned on the exhaust pipeline. Optionally, the air scrubber further comprises a water inlet switch valve, a low-pressure water pump, a water outlet switch valve and a settling tank, wherein a liquid outlet of the air scrubber is communicated with one end of the water inlet switch valve, the other end of the water inlet switch valve is communicated with an inlet of the low-pressure water pump, an outlet of the low-pressure water pump is communicated with one end of the water outlet switch valve, and the other end of the water outlet switch valve is communicated with an inlet of the settling tank. Optionally, the cooling water inlet of the gas cooler is communicated with a cooling water inlet pipeline, and the cooling water outlet of the gas cooler is communicated with a cooling water outlet pipeline. Optionally, the gas-liquid separation device further comprises a liquid regulating valve, wherein a condensate outlet of the gas-liquid separation tank is communicated with one end of the liquid regulating valve, and the other end of the liquid regulating valve is communicated with a water return port of the gas scrubber. From the above description, the condensate outlet of the gas-liquid separation tank enters the gas scrubber for recovery. Optionally, the gas compressor further comprises a low-pressure nitrogen tank, and an outlet of the gas compressor is communicated with an inlet of the low-pressure nitrogen tank. Drawings Fig. 1 is a schematic diagram of an over