Novel anti-surge pellet coal gas pressurizing and pressure regulating system and method thereof

Abstract

The application discloses a novel anti-surge pellet coal gas pressurizing and pressure regulating system and a method thereof, which comprises a pressurizing machine inlet coal gas pipeline, a coal gas pressurizing machine body, a pressurizing machine outlet coal gas pipeline, a flow regulating valve group, a coal gas backflow pipeline, a fixed support group and a sliding support group; a plurality of coal gas pressurizing machine bodies are sequentially installed in a core area of a whole pellet coal gas system, and the air inlet ends of the coal gas pressurizing machine bodies are connected with the pressurizing machine inlet coal gas pipeline, and the air outlet ends are connected with the pressurizing machine outlet coal gas pipeline; the middle part of the pressurizing machine outlet coal gas pipeline is connected with the coal gas backflow pipeline, and the tail end of the coal gas backflow pipeline is connected with the pressurizing machine inlet coal gas pipeline; the flow regulating valve group is installed on the coal gas backflow pipeline, and the fixed support group and the sliding support group are installed on the pressurizing machine outlet coal gas pipeline and the coal gas backflow pipeline. The application has the advantages of high safety, strong energy saving, accurate regulation and control, and fast response, and can avoid production delay caused by coal gas system failure.

Description

Technical Field

[0001] This invention relates to the field of gas technology, specifically to a novel anti-surge pellet gas pressurization and regulation system and method. Background Technology

[0002] Currently, most pellet plants in China use coke oven gas for roasting. However, the coke oven gas entering the pellet plant from the external pipeline network cannot meet the pressure requirements of the pellet roaster burners (generally, the burner burner pressure requirement is ≥35 kPa, but the external pipeline pressure is 7.2 kPa–8 kPa). Therefore, the coke oven gas entering the pellet plant needs to be pressurized at a gas pressurization station inside the pellet plant, which requires a complete gas pressurization and regulation system. However, traditional pellet gas pressurization and regulation systems suffer from drawbacks in the pressure regulation methods and the lack of proper sliding and fixing supports for the gas pipelines, leading to surge in the gas pressurizer and cracking of gas pipeline expansion joints, thus significantly reducing the lifespan of the entire pellet gas system. Therefore, these problems urgently need to be solved. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a novel anti-surge pellet gas pressurization and regulation system and method. Compared with the traditional pellet gas system, it has the advantages of high safety, strong energy saving, accurate regulation and fast response, and has a long service life and high stability, thereby avoiding production delays due to gas system failures, and also saving a lot of electrical energy consumed by pellet gas system pressure regulation.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a novel anti-surge pellet gas pressurization and pressure regulation system, the innovation of which lies in: comprising a pressurizer inlet gas pipeline, a gas pressurizer body, a pressurizer outlet gas pipeline, a flow regulating valve group, a gas return pipeline, a fixed support group, and a sliding support group; several gas pressurizer bodies are sequentially and alternately installed in the core area of ​​the entire pellet gas system, and the inlet end of each gas pressurizer body is connected to the pressurizer inlet gas pipeline, and its outlet end is connected to the pressurizer outlet gas pipeline; the middle position of the pressurizer outlet gas pipeline is connected to the beginning end of the gas return pipeline, and the end end of the gas return pipeline is connected to the pressurizer inlet gas pipeline; the flow regulating valve group is installed on the gas return pipeline on the side near the pressurizer inlet gas pipeline, and several fixed support groups and several sliding support groups are installed on the pressurizer outlet gas pipeline and the gas return pipeline;

[0005] The flow regulating valve group includes a reflux gas vent valve, a reflux electric butterfly valve, and a reflux flow regulating valve; a reflux flow regulating valve is also provided on the side of the gas reflux pipeline near the compressor inlet gas pipeline, and reflux electric butterfly valves are also provided at intervals on both sides of the gas reflux pipeline relative to the reflux flow regulating valve. A reflux gas vent valve is also provided at intervals on the side of each reflux electric butterfly valve near the compressor inlet gas pipeline, and each reflux gas vent valve is provided on the gas reflux pipeline.

[0006] Along the natural gas transport direction, the gas pipeline at the outlet of the compressor is provided with sliding support group I, sliding support group II, fixed support group II, sliding support group III, sliding support group IV, sliding support group V, fixed support group III, sliding support group VI, sliding support group VII, and fixed support group IV in sequence at intervals. The end of the gas pipeline at the outlet of the compressor is connected to the gas inlet point of the roasting plant. Gas expansion joints are provided at intervals between the sliding support group II and the fixed support group II on the gas pipeline at the outlet of the compressor. Gas pressure detection devices are also provided at intervals between the fixed support group IV and the gas inlet point of the roasting plant on the gas pipeline at the outlet of the compressor.

[0007] Along the gas return pipeline, sliding support groups V, IV, III, I, II, and VI are sequentially spaced along the gas return direction. Sliding support group I is located on the side of the flow regulating valve group away from the gas inlet pipeline of the compressor. Gas expansion joints are also spaced between the fixed support group I and the sliding support group II on the gas return pipeline.

[0008] Preferably, an electric inlet butterfly valve, an electric inlet blind valve, an inlet pressure gauge, and an inlet temperature gauge are sequentially and spaced apart between the gas inlet pipe of the pressurizer and each of the gas pressurizer bodies. The electric inlet butterfly valve is located on the side near the gas inlet pipe of the pressurizer, and gas venting valves are also spaced apart between the gas inlet pipe of the pressurizer and each of the gas pressurizer bodies on both sides of the electric inlet butterfly valve.

[0009] Preferably, an electric butterfly valve, an electric blind valve, and an outlet pressure gauge are sequentially and spaced apart between the gas outlet pipeline of the pressurizer and each of the gas pressurizer bodies. The electric butterfly valve is located on the side near the gas outlet pipeline of the pressurizer. Furthermore, gas venting valves are spaced apart between the gas outlet pipeline of the pressurizer and each of the gas pressurizer bodies, respectively, on both sides of the electric blind valve.

[0010] The present invention discloses a novel pressurization and pressure regulation method for a pellet gas pressurization and pressure regulation system to prevent surge. Its innovation lies in including the following steps:

[0011] (1) Initial pressurization: First, open the inlet gas vent valve, inlet electric butterfly valve, inlet electric blind valve, outlet gas vent valve, outlet electric blind valve and outlet electric butterfly valve. Then close the return electric butterfly valve, return flow regulating valve and return gas vent valve. Then observe the inlet pressure gauge, inlet temperature indicator and outlet pressure gauge. The outlet pressure should be stable at no less than 35 kPa.

[0012] (2) Mid-term pressure increase: Then open the return electric butterfly valve, return flow regulating valve and return gas vent valve, and adjust the motor frequency of the gas compressor body to start pressure increase. Then observe the gas pressure detection device, inlet pressure detection gauge and outlet pressure detection gauge. When the system pressure requirement is reached, stop pressure increase.

[0013] (3) Pressure reduction in the middle: Then keep the return electric butterfly valve, return flow regulating valve and return gas vent valve in the open state, and adjust the motor frequency of the gas compressor body to start reducing the pressure. Then observe the gas pressure detection device, inlet pressure detection gauge and outlet pressure detection gauge. When the system pressure requirement is reached, stop reducing the pressure.

[0014] (4) Stop pressurization: Then close the inlet gas vent valve, inlet electric butterfly valve, inlet electric blind valve, outlet gas vent valve, outlet electric blind valve, outlet electric butterfly valve, return electric butterfly valve, return flow regulating valve and return gas vent valve to stop pressurization.

[0015] Preferably, when the pressure at the gas inlet of the roasting plant needs to be increased or decreased, the reflux flow regulating valve is in the open state, and its opening degree is fixed at 10%~15%.

[0016] Preferably, when the pressure at the gas inlet of the roasting plant needs to be increased to more than 35 kPa, the motor frequency of the gas compressor body is adjusted to 40 Hz to 50 Hz.

[0017] Preferably, when the pressure at the gas inlet of the roasting plant needs to be lower than 35 kPa, the motor frequency of the gas compressor body is adjusted to 25 Hz~35 Hz.

[0018] The beneficial effects of this invention are:

[0019] (1) Compared with the traditional coal gas system used in pelletizing, the present invention has the advantages of high safety, strong energy saving, accurate control and fast response, and has a long service life and great stability, thereby avoiding production delays due to coal gas system failures, and also saving a lot of electrical energy consumed by the pressure regulation of the pelletizing coal gas system.

[0020] (2) By fixing the opening of the return flow regulating valve and adjusting the motor frequency of the gas compressor body, the present invention can regulate the pressure of the entire gas system and avoid surge of the gas compressor body.

[0021] (3) By adjusting the gas pressure and using the characteristics of the sliding support group and the fixed support group, the present invention effectively prevents the gas compressor body from surging and avoids the gas expansion joint from cracking, thereby extending the service life of the entire gas system and ensuring the stability of pellet production. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the structure of a novel anti-surge pellet gas pressurization and pressure regulation system according to the present invention.

[0023] Among them, 1-Gas inlet pipe of the compressor; 2-Inlet electric butterfly valve; 3-Inlet gas vent valve; 4-Inlet electric blind valve; 5-Inlet pressure gauge; 6-Inlet temperature indicator; 7-Gas compressor body; 8-Outlet pressure gauge; 9-Outlet gas vent valve; 10-Outlet electric blind valve; 11-Outlet electric butterfly valve; 12-Gas outlet pipe of the compressor; 13-Return gas vent valve; 14-Return electric butterfly valve; 15-Return flow rate regulator 16-Sliding support group I; 17-Gas return pipeline; 18-Sliding support group II; 19-Gas expansion joint; 20-Fixed support group II; 21-Fixed support group I; 22-Sliding support group III; 23-Sliding support group IV; 24-Sliding support group V; 25-Fixed support group III; 26-Sliding support group VI; 27-Sliding support group VII; 28-Fixed support group IV; 29-Gas pressure detection device; 30-Gas access point for roasting plant. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0025] This invention discloses a novel anti-surge gas pressurization and pressure regulation system for pelletized coal gas, comprising a gas inlet pipe 1, a gas pressurizer body 7, a gas outlet pipe 12, a flow regulating valve assembly, a gas return pipe 17, a fixed support assembly, and a sliding support assembly; the specific structure is as follows: Figure 1As shown, several gas compressor bodies 7 are installed in parallel at intervals in the core area of ​​the entire pellet gas system, and the inlet end of each gas compressor body 7 is connected to the gas inlet pipe 1 of the compressor, and its outlet end is connected to the gas outlet pipe 12 of the compressor.

[0026] like Figure 1 As shown, between the gas inlet pipe 1 of the compressor and each gas compressor body 7, an electric inlet butterfly valve 2, an electric inlet blind valve 4, an inlet pressure gauge 5, and an inlet temperature indicator 6 are sequentially and spaced apart. The electric inlet butterfly valve 2 is located on the side closest to the gas inlet pipe 1 of the compressor. Between the gas inlet pipe 1 of the compressor and each gas compressor body 7, an inlet gas vent valve 3 is also spaced apart on both sides of the electric inlet butterfly valve 2.

[0027] like Figure 1 As shown, between the gas outlet pipeline 12 of the pressurizer and each gas pressurizer body 7, there are also sequentially spaced gas outlet electric butterfly valves 11, gas outlet electric blind valves 10 and gas outlet pressure gauges 8. The gas outlet electric butterfly valves 11 are located on the side near the gas outlet pipeline 12 of the pressurizer. In addition, between the gas outlet pipeline 12 of the pressurizer and each gas pressurizer body 7, there are also gas outlet vent valves 9 spaced apart on both sides of the gas outlet electric blind valve 10.

[0028] In this invention, the middle part of the compressor outlet gas pipe 12 is connected to the beginning end of the gas return pipe 17, and the end end of the gas return pipe 17 is connected to the compressor inlet gas pipe 1; as shown Figure 1 As shown, the flow regulating valve assembly is installed on the gas return pipe 17 on the side of the compressor inlet gas pipe 1, and several fixed support groups and several sliding support groups are installed in a specific order on the compressor outlet gas pipe 12 and the gas return pipe 17.

[0029] The flow control valve assembly includes a return gas vent valve 13, a return electric butterfly valve 14, and a return flow control valve 15; for example... Figure 1 As shown, a return flow regulating valve 15 is also provided on the side of the gas return pipeline 17 near the compressor inlet gas pipeline 1, and a return electric butterfly valve 14 is provided on both sides of the gas return pipeline 17 at intervals relative to the return flow regulating valve 15. A return gas vent valve 13 is also provided on the side of each return electric butterfly valve 14 near the compressor inlet gas pipeline 1 at intervals, and each return gas vent valve 13 is provided on the gas return pipeline 17.

[0030] like Figure 1As shown, along the natural gas transport direction, the gas pipeline 12 at the outlet of the compressor is provided with sliding support group I 16, sliding support group II 18, fixed support group II 20, sliding support group III 22, sliding support group IV 23, sliding support group V 24, fixed support group III 25, sliding support group VI 26, sliding support group VII 27, and fixed support group IV 28 in sequence. The end of the gas pipeline 12 at the outlet of the compressor is connected to the gas access point 30 of the roasting plant. Gas expansion joints 19 are also provided between the sliding support group II 18 and the fixed support group II 20 on the gas pipeline 12 at the outlet of the compressor. Gas pressure detection devices 29 are also provided between the fixed support group IV 28 and the gas access point 30 of the roasting plant on the gas pipeline 12 at the outlet of the compressor.

[0031] like Figure 1 As shown, along the gas return pipe 17, sliding support groups V24, IV23, III22, I21, II18, and I16 are sequentially spaced along the gas return direction. Sliding support group I16 is located on the side of the flow regulating valve group away from the compressor inlet gas pipe 1. Gas expansion joints 19 are also spaced between the fixed support group I21 and the sliding support group II18 on the gas return pipe 17.

[0032] This invention discloses a novel pressure regulating method for a pellet gas pressurization and regulation system to prevent surge, as follows: Figure 1 As shown, it includes the following steps:

[0033] (1) Initial pressurization: First, open the gas vent valve 3, the electric butterfly valve 2, the electric blind valve 4, the gas vent valve 9, the electric blind valve 10 and the electric butterfly valve 11. Then close the electric butterfly valve 14, the flow regulating valve 15 and the gas vent valve 13. Then observe the gas pressure gauge 5, the gas temperature indicator 6 and the gas pressure gauge 8. The gas pressure should be stable and not lower than 35 kPa.

[0034] (2) Mid-term pressure increase: Then open the return electric butterfly valve 14, the return flow regulating valve 15 and the return gas vent valve 13, and adjust the motor frequency of the gas compressor body 7 to start pressure increase. Then observe the gas pressure detection device 29, the inlet pressure detection gauge 5 and the outlet pressure detection gauge 8. When the system pressure requirement is reached, stop the pressure increase.

[0035] (3) Pressure reduction in the middle: Then keep the return electric butterfly valve 14, the return flow regulating valve 15 and the return gas vent valve 13 in the open state, and adjust the motor frequency of the gas compressor body 7 to start pressure reduction. Then observe the gas pressure detection device 29, the inlet pressure detection gauge 5 and the outlet pressure detection gauge 8. When the system pressure requirement is reached, stop pressure reduction.

[0036] (4) Stop pressurization: Then close the inlet gas vent valve 3, inlet electric butterfly valve 2, inlet electric blind valve 4, outlet gas vent valve 9, outlet electric blind valve 10, outlet electric butterfly valve 11, return electric butterfly valve 14, return flow regulating valve 15 and return gas vent valve 13 to stop pressurization.

[0037] When the pressure at the gas inlet 30 of the roasting plant needs to be increased or decreased, the return flow regulating valve 15 is in the open state, and its opening degree is fixed at 10%~15%; when the pressure at the gas inlet 30 of the roasting plant needs to be increased to more than 35Kpa, the motor frequency of the gas compressor body 7 is adjusted to 40Hz~50Hz; when the pressure at the gas inlet 30 of the roasting plant needs to be lower than 35Kpa, the motor frequency of the gas compressor body 7 is adjusted to 25Hz~35Hz.

[0038] The beneficial effects of this invention are:

[0039] (1) Compared with the traditional coal gas system used in pelletizing, the present invention has the advantages of high safety, strong energy saving, accurate control and fast response, and has a long service life and great stability, thereby avoiding production delays due to coal gas system failures, and also saving a lot of electrical energy consumed by the pressure regulation of the pelletizing coal gas system.

[0040] (2) By fixing the opening of the return flow regulating valve 15 and adjusting the motor frequency of the gas compressor body 7, the present invention can regulate the pressure of the entire gas system and prevent the gas compressor body 7 from surging.

[0041] (3) By adjusting the gas pressure and using the characteristics of the sliding support group and the fixed support group, the present invention effectively prevents the gas compressor body 7 from surging and avoids the gas expansion joint 19 from cracking, thereby extending the service life of the entire gas system and ensuring the stability of pellet production.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A novel anti-surge swell gas pressurization and pressure regulation system, characterized in that: The system includes a gas inlet pipe for a gas compressor, a gas compressor body, a gas outlet pipe for a gas compressor, a flow regulating valve assembly, a gas return pipe, a fixed support assembly, and a sliding support assembly. Several gas compressor bodies are sequentially and alternately installed in the core area of ​​the entire pellet gas system. The inlet end of each gas compressor body is connected to the gas inlet pipe, and its outlet end is connected to the gas outlet pipe. The middle section of the gas outlet pipe is connected to the beginning of the gas return pipe, and the end of the gas return pipe is connected to the gas inlet pipe. The flow regulating valve assembly is installed on the gas return pipe near the gas inlet pipe. Several fixed support assemblies and several sliding support assemblies are installed on the gas outlet pipe and the gas return pipe. The flow regulating valve group includes a reflux gas vent valve, a reflux electric butterfly valve, and a reflux flow regulating valve; a reflux flow regulating valve is also provided on the side of the gas reflux pipeline near the compressor inlet gas pipeline, and reflux electric butterfly valves are also provided at intervals on both sides of the gas reflux pipeline relative to the reflux flow regulating valve. A reflux gas vent valve is also provided at intervals on the side of each reflux electric butterfly valve near the compressor inlet gas pipeline, and each reflux gas vent valve is provided on the gas reflux pipeline. Along the natural gas transport direction, the gas pipeline at the outlet of the compressor is provided with sliding support group I, sliding support group II, fixed support group II, sliding support group III, sliding support group IV, sliding support group V, fixed support group III, sliding support group VI, sliding support group VII, and fixed support group IV in sequence at intervals. The end of the gas pipeline at the outlet of the compressor is connected to the gas inlet point of the roasting plant. Gas expansion joints are provided at intervals between the sliding support group II and the fixed support group II on the gas pipeline at the outlet of the compressor. Gas pressure detection devices are also provided at intervals between the fixed support group IV and the gas inlet point of the roasting plant on the gas pipeline at the outlet of the compressor. Along the gas return pipeline, sliding support groups V, IV, III, I, II, and VI are sequentially spaced along the gas return direction. Sliding support group I is located on the side of the flow regulating valve group away from the gas inlet pipeline of the compressor. Gas expansion joints are also spaced between the fixed support group I and the sliding support group II on the gas return pipeline.

2. The novel anti-surge gas pressurization and pressure regulation system for pelletized coal gas according to claim 1, characterized in that: Between the gas inlet pipe of the pressurizer and each of the gas pressurizer bodies, an electric inlet butterfly valve, an electric inlet blind valve, an inlet pressure gauge, and an inlet temperature indicator are sequentially and spaced apart. The electric inlet butterfly valve is located on the side near the gas inlet pipe of the pressurizer. Between the gas inlet pipe of the pressurizer and each of the gas pressurizer bodies, gas venting valves are also spaced apart on both sides of the electric inlet butterfly valve.

3. A novel anti-surge gas pressurization and pressure regulation system for pelletized coal gas according to claim 2, characterized in that: Between the gas outlet pipeline of the pressurizer and each of the gas pressurizer bodies, an electric butterfly valve, an electric blind valve, and a gas pressure gauge are sequentially and spaced apart. The electric butterfly valve is located on the side near the gas outlet pipeline of the pressurizer. Gas venting valves are also spaced apart on both sides of the electric blind valve between the gas outlet pipeline of the pressurizer and each of the gas pressurizer bodies.

4. The pressurization and pressure regulation method of a novel anti-surge pellet gas pressurization and pressure regulation system according to claim 3, characterized in that... Includes the following steps: (1) Initial pressurization: First, open the inlet gas vent valve, inlet electric butterfly valve, inlet electric blind valve, outlet gas vent valve, outlet electric blind valve and outlet electric butterfly valve. Then close the return electric butterfly valve, return flow regulating valve and return gas vent valve. Then observe the inlet pressure gauge, inlet temperature indicator and outlet pressure gauge. The outlet pressure should be stable at no less than 35 kPa. (2) Mid-term pressure increase: Then open the return electric butterfly valve, return flow regulating valve and return gas vent valve, and adjust the motor frequency of the gas compressor body to start pressure increase. Then observe the gas pressure detection device, inlet pressure detection gauge and outlet pressure detection gauge. When the system pressure requirement is reached, stop pressure increase. (3) Pressure reduction in the middle: Then keep the return electric butterfly valve, return flow regulating valve and return gas vent valve in the open state, and adjust the motor frequency of the gas compressor body to start reducing the pressure. Then observe the gas pressure detection device, inlet pressure detection gauge and outlet pressure detection gauge. When the system pressure requirement is reached, stop reducing the pressure. (4) Stop pressurization: Then close the inlet gas vent valve, inlet electric butterfly valve, inlet electric blind valve, outlet gas vent valve, outlet electric blind valve, outlet electric butterfly valve, return electric butterfly valve, return flow regulating valve and return gas vent valve to stop pressurization.

5. The pressurization and pressure regulation method of a novel anti-surge pellet gas pressurization and pressure regulation system according to claim 4, characterized in that: When the pressure at the gas inlet of the roasting plant needs to be increased or decreased, the return flow regulating valve is in the open state, and its opening degree is fixed at 10%~15%.

6. The pressurization and pressure regulation method of a novel anti-surge pellet gas pressurization and pressure regulation system according to claim 4, characterized in that: When the pressure at the gas inlet of the roasting plant needs to be increased to more than 35 kPa, the motor frequency of the gas compressor body should be adjusted to 40 Hz to 50 Hz.

7. The pressurization and pressure regulation method of a novel anti-surge pellet gas pressurization and pressure regulation system according to claim 4, characterized in that: When the pressure at the gas inlet of the roasting plant needs to be lower than 35 kPa, the motor frequency of the gas compressor body should be adjusted to 25 Hz~35 Hz.

Images