Recycling system for emptying gas in pulverized coal preparation process

Abstract

The utility model provides a recycling system for emptying gas in a pulverized coal preparation process. The recycling system comprises a gas washer, a gas cooler, a gas-liquid separation tank, a gas compressor and a gas pressure reducing valve, a gas inlet of the gas scrubber is used for being connected with an emptying gas outlet of a pulverized coal preparation unit, a liquid inlet of the gas scrubber is connected into a scrubbing water pipeline, a gas outlet of the gas scrubber is communicated with a gas inlet of the gas cooler, and a gas outlet of the gas cooler is communicated with an inlet of the gas-liquid separation tank. A gas outlet of the gas-liquid separation tank is communicated with an inlet of the gas compressor, an 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 connected with a sealing fan inlet of the pulverized coal preparation unit. According to the utility model, not only is the resource utilization efficiency improved, but also the influence on the environment is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical production, and in particular to a system for recovering and utilizing vented gases during the preparation of pulverized coal. Background Technology

[0002] In current pulverized coal gasification processes, the pulverized coal preparation stage is crucial. The basic process involves feeding raw coal into a coal mill for pulverization, followed by drying with a hot inert gas. A circulating fan then transports the mixture of air and pulverized coal to a baghouse dust collector for air-coal separation. The separated pulverized coal is conveyed to subsequent stages via an ash conveying system, while approximately 20% of the recirculated air, after being pressurized by the circulating fan, is directly released into the atmosphere at the outlet as vented air. This vented air typically contains water vapor, nitrogen, and a small amount of coal dust.

[0003] Traditional methods of treatment often involve direct emission into the atmosphere, which not only wastes usable resources but may also cause environmental pollution. Therefore, designing a more efficient method for recovering and treating vented gases from the pulverized coal preparation process is both necessary and meaningful. Utility Model Content

[0004] In order to solve the above-mentioned problems of the prior art, the present invention provides a system for recycling vented gases during the coal powder preparation process, so as to recycle and utilize the vented gases.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, this utility model provides a system for recovering and utilizing vented gases during the coal powder preparation process, including a gas scrubber, a gas cooler, a gas-liquid separator, a gas compressor, and a gas pressure reducing valve;

[0007] The gas inlet of the gas scrubber is connected to the venting gas outlet of the pulverized coal preparation unit. The liquid inlet of the gas scrubber is connected to the washing water pipeline. The gas outlet of the gas scrubber is connected to the gas inlet of the gas cooler. The gas outlet of the gas cooler is connected to the inlet of the gas-liquid separator. The gas outlet of the gas-liquid separator is connected to the inlet of the gas compressor. The outlet of the gas compressor is connected to one end of the gas pressure reducing valve. The other end of the gas pressure reducing valve is connected to the sealing fan inlet of the pulverized coal preparation unit.

[0008] The beneficial effects of this utility model are as follows: the vent gas from the pulverized coal preparation unit is treated with dust removal, then cooled by a gas cooler, and then enters a gas-liquid separator to complete gas-liquid separation. The separated gas is pressurized by a gas compressor, then depressurized to a suitable pressure by a gas pressure reducing valve, and then sent to the sealed fan inlet of the pulverized coal preparation unit, thereby completing the reuse of the gas and recycling the vent gas. This not only improves resource utilization efficiency but also reduces the impact on the environment.

[0009] Optionally, it also includes an exhaust pipeline and a gas regulating valve, wherein the exhaust pipeline is used to connect to the vent gas outlet of the pulverized coal preparation unit, and the gas regulating valve is located on the exhaust pipeline.

[0010] Optionally, it also includes an inlet valve, a low-pressure water pump, an outlet valve, and a settling tank. The liquid outlet of the gas scrubber is connected to one end of the inlet valve, the other end of the inlet valve is connected to the inlet of the low-pressure water pump, the outlet of the low-pressure water pump is connected to one end of the outlet valve, and the other end of the outlet valve is connected to the inlet of the settling tank.

[0011] Optionally, the cooling water inlet of the gas cooler is connected to the cooling water inlet pipeline, and the cooling water outlet of the gas cooler is connected to the cooling water outlet pipeline.

[0012] Optionally, it also includes a liquid regulating valve, wherein the condensate outlet of the gas-liquid separator is connected to one end of the liquid regulating valve, and the other end of the liquid regulating valve is connected to the return water port of the gas scrubber.

[0013] As described above, the condensate outlet of the gas-liquid separator enters the gas scrubber for recycling.

[0014] Optionally, it also includes a low-pressure nitrogen tank, with the outlet of the gas compressor connected to the inlet of the low-pressure nitrogen tank. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall process of a coal powder preparation process venting gas recovery and utilization system according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1. Gas scrubber; 11. Washing water pipeline;

[0018] 2. Gas cooler; 21. Cooling water inlet pipe; 22. Cooling water outlet pipe;

[0019] 3. Gas-liquid separator; 31. Liquid regulating valve;

[0020] 4. Gas compressor;

[0021] 5. Gas pressure reducing valve;

[0022] 6. Exhaust pipeline; 61. Gas regulating valve;

[0023] 7. Low-pressure water pump; 71. Inlet valve; 72. Outlet valve;

[0024] 8. Settling tank;

[0025] 9. Low-pressure nitrogen cylinder;

[0026] 100. Pulverized coal preparation unit; 101. Sealing fan. Detailed Implementation

[0027] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art. Example 1

[0028] Please refer to Figure 1 This embodiment provides a system for recovering and utilizing vented gases during the coal powder preparation process, including a gas scrubber 1, a gas cooler 2, a gas-liquid separator 3, a liquid regulating valve 31, a gas compressor 4, a gas pressure reducing valve 5, an exhaust pipeline 6, a gas regulating valve 61, a water inlet switch valve 71, a low-pressure water pump 7, a water outlet switch valve 72, a settling tank 8, and a low-pressure nitrogen tank 9.

[0029] Among them, the exhaust pipeline 6 is used to connect to the venting gas outlet of the pulverized coal preparation unit 100, the gas regulating valve 61 is located on the exhaust pipeline 6, the gas inlet of the gas scrubber 1 is used to connect to the venting gas outlet of the pulverized coal preparation unit 100, the liquid inlet of the gas scrubber 1 is connected to the washing water pipeline 11, the gas outlet of the gas scrubber 1 is connected to the gas inlet of the gas cooler 2, the cooling water inlet of the gas cooler 2 is connected to the cooling water inlet pipeline 21, the cooling water outlet of the gas cooler 2 is connected to the cooling water outlet pipeline 22, the gas outlet of the gas cooler 2 is connected to the inlet of the gas-liquid separator 3, the gas outlet of the gas-liquid separator 3 is connected to the inlet of the gas compressor 4, the outlet of the gas compressor 4 is connected to one end of the gas pressure reducing valve 5 and the inlet of the low-pressure nitrogen tank 9, and the other end of the gas pressure reducing valve 5 is used to connect to the inlet of the sealing fan 101 of the pulverized coal preparation unit 100 to realize the reuse of nitrogen.

[0030] The condensate outlet of the gas-liquid separator 3 is connected to one end of the liquid regulating valve 31, the other end of the liquid regulating valve 31 is connected to the return water port of the gas scrubber 1, the liquid outlet of the gas scrubber 1 is connected to one end of the water inlet switch valve 71, the other end of the water inlet switch valve 71 is connected to the inlet of the low-pressure water pump 7, the outlet of the low-pressure water pump 7 is connected to one end of the water outlet switch valve 72, and the other end of the water outlet switch valve 72 is connected to the inlet of the settling tank 8, thereby realizing the recycling of water.

[0031] Specifically, the workflow of this embodiment is as follows:

[0032] (1) The vented gas after use in the pulverized coal preparation unit 100 is first washed and dust removed by the gas scrubber 1, then cooled to below 40°C by the gas cooler 2, and then sent to the gas-liquid separator 3 for gas-liquid separation.

[0033] (2) The nitrogen separated in the gas-liquid separator 3 is then pressurized to 0.35 MPa by the gas compressor 4. Part of it is sent to the low-pressure nitrogen tank 9, and the other part is reduced to 0.05 MPa by the gas pressure reducing valve 5 and sent to the inlet of the sealed fan 101 of the pulverized coal preparation unit 100 to realize the reuse of nitrogen.

[0034] (3) The condensate separated by the gas-liquid separator 3 is discharged into the gas scrubber 1, mixed with the washing water in the gas scrubber 1, and then pressurized to 0.5MPa by the low-pressure water pump 7, and finally sent to the settling tank 8 for use as recycled water.

[0035] Among them, the liquid level on the gas scrubber 1 is controlled at 40%-60% of its own capacity. The liquid regulating valve 31 on the gas-liquid separator 3, the gas regulating valve 61 on the exhaust pipeline 6, the water inlet switch valve 71 before and after the low-pressure water pump 7, and the water outlet switch valve 72 control the opening and closing of the pipelines through the opening and closing of the valves, so as to realize the flow direction control of gas or liquid.

[0036] Therefore, this utility model has the following advantages:

[0037] (1) By recycling the vented gas, the waste of resources and environmental pollution are reduced.

[0038] (2) By recovering and utilizing the nitrogen in the venting gas, the amount of low-pressure nitrogen replenishment can be reduced, thereby lowering production costs.

[0039] (3) By recovering and utilizing the water vapor in the venting gas, approximately 8.7 tons of water are saved for the slag and water treatment unit, thus reducing production costs.

[0040] Therefore, this utility model not only improves resource utilization efficiency but also reduces environmental impact, and has the advantages of good treatment effect, safety and reliability, simple process and low operating cost.

[0041] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0043] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A system for recovering and utilizing vented gases during the preparation of pulverized coal, characterized in that, Includes gas scrubbers, gas coolers, gas-liquid separators, gas compressors, and gas pressure reducing valves; The gas inlet of the gas scrubber is connected to the venting gas outlet of the pulverized coal preparation unit. The liquid inlet of the gas scrubber is connected to the washing water pipeline. The gas outlet of the gas scrubber is connected to the gas inlet of the gas cooler. The gas outlet of the gas cooler is connected to the inlet of the gas-liquid separator. The gas outlet of the gas-liquid separator is connected to the inlet of the gas compressor. The outlet of the gas compressor is connected to one end of the gas pressure reducing valve. The other end of the gas pressure reducing valve is connected to the sealing fan inlet of the pulverized coal preparation unit.

2. The system for recovering and utilizing vented gases during the preparation of pulverized coal according to claim 1, characterized in that, It also includes an exhaust pipeline and a gas regulating valve, wherein the exhaust pipeline is used to connect to the vent gas outlet of the pulverized coal preparation unit, and the gas regulating valve is located on the exhaust pipeline.

3. The system for recovering and utilizing vented gases during the preparation of pulverized coal according to claim 1, characterized in that, It also includes an inlet valve, a low-pressure water pump, an outlet valve, and a settling tank. The liquid outlet of the gas scrubber is connected to one end of the inlet valve, the other end of the inlet valve is connected to the inlet of the low-pressure water pump, the outlet of the low-pressure water pump is connected to one end of the outlet valve, and the other end of the outlet valve is connected to the inlet of the settling tank.

4. The system for recovering and utilizing vented gases during the coal powder preparation process according to claim 1, characterized in that, The cooling water inlet of the gas cooler is connected to the cooling water inlet pipeline, and the cooling water outlet of the gas cooler is connected to the cooling water outlet pipeline.

5. A system for recovering and utilizing vented gases during pulverized coal preparation according to claim 1, characterized in that, It also includes a liquid regulating valve, with the condensate outlet of the gas-liquid separator connected to one end of the liquid regulating valve and the other end of the liquid regulating valve connected to the return water port of the gas scrubber.

6. The system for recovering and utilizing vented gases during the preparation of pulverized coal according to claim 1, characterized in that, It also includes a low-pressure nitrogen tank, with the outlet of the gas compressor connected to the inlet of the low-pressure nitrogen tank.

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