A method for reversing a gas pump station pump

Abstract

The present application belongs to the technical field of coal mine underground gas drainage, solves the problem of sharp decline of negative pressure after pump reversal, long recovery time of the system, long time negative pressure, concentration and flow of the system after pump reversal, and the problem of normal recovery of the system in a period of time. A gas pump station pump reversal method is provided, which adjusts the pump reversal sequence and valve angle, finds the negative pressure balance point, and realizes smooth pump reversal of the water ring vacuum pump multiple pumps running simultaneously; when a group of main pumps and standby pumps are reversed, the original state of the other group of main pumps and standby pumps is maintained, the required main pumps and standby pumps for pump reversal are set as 1# and 2#, and the other group of main pumps and standby pumps are set as 3# and 4#. The present application adjusts the pump reversal sequence and valve angle, finds the negative pressure balance point, and realizes smooth reversal of the water ring vacuum pump multiple pumps running simultaneously. After adjustment, the pump reversal is more stable, and basically does not affect the system operation. It can effectively solve the problems of pressure fluctuation of the system, large load of the standby pump start, etc.

Description

Technical Field

[0001] This invention belongs to the field of underground gas drainage technology in coal mines, and specifically relates to a method for reversing the pump in a gas pumping station. Background Technology

[0002] After each pump reversal at the gas pump station, two phenomena occur: First, the negative pressure drops sharply, even reaching "0". At the drilling site, gas overflow occurs, causing gas over-limit alarms or power outages. Second, the system recovery time is long, up to 66 minutes. After the pump reversal, the system's negative pressure, concentration, and flow rate cannot return to normal for a long time. Analysis of the negative pressure, flow rate, and concentration curves and operating procedures before and after the pump reversal reveals that all pump stations have a pressure-reducing start-up phenomenon. Each pump station has a large negative pressure in the system, and overflow occurs during startup.

[0003] Meanwhile, the operation process is rather vague, and there is no specific opening degree for the valves. During operation, the valves may be opened to 90° in one go, which may cause the equipment to overload and trip, or the gas holder may descend at a speed that exceeds the specified limit when the vent valve is opened. All of these pose significant risks to the operation of the system. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems in the prior art, the present invention provides a method for switching gas pumps in a gas pumping station.

[0005] This invention employs the following technical solution: a method for switching pumps in a gas pumping station, which achieves smooth switching of multiple water ring vacuum pumps operating simultaneously by adjusting the switching sequence and valve angles to find the negative pressure balance point; when one set of main pumps and standby pumps is switching, the original state of another set of main pumps and standby pumps is maintained, and the main pumps and standby pumps to be switched are set as pumps #1 and #2, and the other set of main pumps and standby pumps are set as pumps #3 and #4, including the following steps:

[0006] S1: Turn the vent valve of pump #2 to the first set angle θ1;

[0007] S2: Turn the water supply valve of pump #1 back to 0 degrees, and turn the inlet and outlet valves of pump #1 back to the second set angle θ2;

[0008] S3: Press the stop button for pump #1, and at the same time turn the inlet and outlet valves of pump #1 back to 0 degrees.

[0009] S4: Press the start button of pump #2, and at the same time open the water supply valve of pump #2. Wait for the air intake negative pressure of pump #2 to reach the system negative pressure, and at the same time open the air intake and exhaust valves of pump #2 to the third set angle θ3.

[0010] S5: Turn the vent valve of pump #2 back to 0 degrees, and then turn the inlet and outlet valves of pump #2 to 90 degrees.

[0011] Preferably, the first set angle θ1 is 10 degrees.

[0012] Preferably, the second set angle θ2 is 10 degrees.

[0013] Preferably, the range of the third set angle θ3 is 20-30 degrees.

[0014] Preferably, the inlet ends of the air inlet valves of pumps #1 and #2 are connected to the gas extraction pipeline #1, the inlet ends of the air inlet valves of pumps #3 and #4 are connected to the gas extraction pipeline #2, and the outlet ends of the exhaust valves of pumps #1, #2, #3, and #4 are connected to the pipeline to the user; the gas extraction pipeline #1 and the gas extraction pipeline #2 are connected by a connecting valve F2 located between the air inlet valves of pumps #2 and #3; and the outlet ends of the vent valves of pumps #1, #2, #3, and #4 are all connected to the vent pipeline.

[0015] Preferably, pumps #1, #2, #3, and #4 are arranged side by side. A connecting valve F1 is installed between the air inlet valves Qb1 and Qb2 of pumps #1 and #2; a connecting valve F2 is installed between the air inlet valves Qb2 and Qb3 of pumps #2 and #3; and a connecting valve F3 is installed between the air inlet valves Qb3 and Qb4 of pumps #3 and #4. A bypass valve Q4 is installed between the gas extraction pipeline #1 and the pipeline to the user; a bypass valve Q44 is installed between the gas extraction pipeline #2 and the pipeline to the user. A connecting valve F4 is installed between the exhaust valves Qb5 and Qb6 of pumps #1 and #2; a connecting valve F5 is installed between the exhaust valves Qb6 and Qb7 of pumps #2 and #3; and a connecting valve F6 is installed between the exhaust valves Qb7 and Qb8 of pumps #3 and #4. The vent valves for pumps #1, #2, #3, and #4 are Qb9, Qb10, Qb11, and Qb12, respectively.

[0016] Preferably, before pumps #1 and #2 start reversing, the valve states are as follows: the inlet and exhaust valves Qb1 and Qb5 of pump #1 are open, and the vent valve Qb9 is closed; the inlet and exhaust valves Qb2 and Qb6 of pump #2 are closed, and the vent valve Qb10 is closed; the inlet and exhaust valves Qb3 and Qb7 of pump #3 are open, and the vent valve Qb11 is closed; the inlet and exhaust valves Qb4 and Qb8 of pump #4 are closed, and the vent valve Qb12 is closed; the connecting valves F1, F3, F4, F5, and F6 are open, and the connecting valve F2 is closed; the bypass valves Q4 and Q44 are closed.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention achieves smooth pump switching during the simultaneous operation of multiple water ring vacuum pumps by adjusting the pump switching sequence and valve angles to find the negative pressure balance point. After adjustment, the pump switching is more stable and has virtually no impact on system operation. It effectively solves problems such as pressure fluctuations during parallel system operation and high start-up loads on standby pumps. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the extraction system of the present invention;

[0021] Figure 2 This is a graph showing the negative pressure, concentration, and flow rate during the reverse pump operation in the original method of this invention (first date);

[0022] Figure 3 This is a graph showing the negative pressure, concentration, and flow rate during the reverse pump operation in the original method of this invention (second date);

[0023] Figure 4 This is a graph showing the negative pressure, concentration, and flow rate curves when the pump is reversed after the improved method of this invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in the present invention. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0026] This invention provides an embodiment:

[0027] like Figure 1As shown, a method for switching pumps in a gas pumping station involves adjusting the switching sequence and valve angles to find a negative pressure balance point, thereby achieving smooth switching of multiple water ring vacuum pumps operating simultaneously. When one set of main pumps and standby pumps is switching, the original state of another set of main pumps and standby pumps is maintained. The main pumps and standby pumps to be switched are designated as pumps #1 and #2, and the other set of main pumps and standby pumps is designated as pumps #3 and #4. The method includes the following steps:

[0028] S1: Turn the vent valve of pump #2 to 10 degrees;

[0029] S2: Turn the water supply valve of pump #1 back to 0 degrees, and turn the inlet and outlet valves of pump #1 back to 10 degrees;

[0030] S3: Press the stop button for pump #1, and at the same time turn the inlet and outlet valves of pump #1 back to 0 degrees.

[0031] S4: Press the start button of pump #2, and at the same time open the water supply valve of pump #2. Wait for the air intake negative pressure of pump #2 to reach the system negative pressure, and at the same time open the air intake and exhaust valves of pump #2 to 20-30 degrees.

[0032] S5: Turn the vent valve of pump #2 back to 0 degrees, and then turn the inlet and outlet valves of pump #2 to 90 degrees.

[0033] In this embodiment, the inlet ends of the air inlet valves of pumps #1 and #2 are connected to the #1 gas extraction pipeline, and the inlet ends of the air inlet valves of pumps #3 and #4 are connected to the #2 gas extraction pipeline. The outlet ends of the exhaust valves of pumps #1, #2, #3, and #4 are connected to the pipeline to the user. The #1 gas extraction pipeline and the #2 gas extraction pipeline are connected by a connecting valve F2 located between the air inlet valves of pumps #2 and #3. The outlet ends of the vent valves of pumps #1, #2, #3, and #4 are all connected to the vent pipeline. 0 degrees refers to the valve's closed state, and 90 degrees refers to the valve's fully open state.

[0034] Pumps #1, #2, #3, and #4 are arranged side by side. A connecting valve F1 is installed between the inlet valves Qb1 and Qb2 of pumps #1 and #2; a connecting valve F2 is installed between the inlet valves Qb2 and Qb3 of pumps #2 and #3; and a connecting valve F3 is installed between the inlet valves Qb3 and Qb4 of pumps #3 and #4. A bypass valve Q4 connects the gas extraction pipeline #1 to the user-to-user pipeline, and a bypass valve Q44 connects the gas extraction pipeline #2 to the user-to-user pipeline. A connecting valve F4 is installed between the exhaust valves Qb5 and Qb6 of pumps #1 and #2; a connecting valve F5 is installed between the exhaust valves Qb6 and Qb7 of pumps #2 and #3; and a connecting valve F6 is installed between the exhaust valves Qb7 and Qb8 of pumps #3 and #4. The vent valves for pumps #1, #2, #3, and #4 are Qb9, Qb10, Qb11, and Qb12, respectively.

[0035] Before pumps #1 and #2 start reversing, the valve status is as follows: Pump #1's inlet and exhaust valves Qb1 and Qb5 are open, and the vent valve Qb9 is closed; Pump #2's inlet and exhaust valves Qb2 and Qb6 are closed, and the vent valve Qb10 is closed; Pump #3's inlet and exhaust valves Qb3 and Qb7 are open, and the vent valve Qb11 is closed; Pump #4's inlet and exhaust valves Qb4 and Qb8 are closed, and the vent valve Qb12 is closed; connecting valves F1, F3, F4, F5, and F6 are open, and connecting valve F2 is closed; bypass valves Q4 and Q44 are closed.

[0036] like Figure 2 , Figure 3 As shown, the conventional method for reversing the pump is as follows:

[0037] S1: First open the disc valve Q4 (the exhaust flow back to the intake side causes the negative pressure on the intake side to drop);

[0038] S2: Press the stop button for pump #1, and simultaneously close the inlet and outlet valves Qb1 and Qb5 of pump #1; then close the water supply valve of pump #1.

[0039] S3: Open the inlet and outlet valves Qb2 and Qb6 of pump #2;

[0040] S4: Press the start button for pump #2 to open the water supply valve for pump #2;

[0041] S5: Close the through valve Q4, and the pump reversal is complete.

[0042] There are two reasons why using the above-mentioned pump reversal method results in low system pressure and long recovery time:

[0043] 1. The above operation causes the pressure of the entire extraction and discharge system to drop as the negative pressure on the intake side decreases due to the exhaust return flow. Furthermore, because the system pipeline is relatively long, the system recovery time is naturally long.

[0044] 2. After pump #1 stops, the intake and exhaust pipes of pump #1 and pump #3 form a loop. Methane gas enters the intake side through the exhaust side of pump #1, and pump #3 begins to do useless work, or even returns to the downhole system, causing the system pressure to drop again.

[0045] like Figure 4 As shown, this invention achieves smooth pump switching when multiple water ring vacuum pumps operate simultaneously by adjusting the pump switching sequence and valve angles to find the negative pressure balance point (the intake negative pressure of pump #2 reaches or is slightly higher than the system negative pressure). After adjustment, the pump switching is more stable and has virtually no impact on system operation. It effectively solves problems such as pressure fluctuations during system paralleling and high start-up loads on standby pumps.

[0046] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for reversing pumps in a gas pumping station, which achieves smooth reversing of multiple water ring vacuum pumps operating simultaneously by adjusting the reversing sequence and valve angles to find the negative pressure balance point; when one set of main pumps and standby pumps is reversing, the original state of another set of main pumps and standby pumps is maintained, and the main pumps and standby pumps to be reversed are set as pumps #1 and #2, and the other set of main pumps and standby pumps are set as pumps #3 and #4, characterized in that, The inlet ends of the air inlet valves of pumps #1 and #2 of the gas pumping station are connected to the #1 gas extraction pipeline; the inlet ends of the air inlet valves of pumps #3 and #4 are connected to the #2 gas extraction pipeline; the outlet ends of the exhaust valves of pumps #1, #2, #3, and #4 are connected to the pipeline to the user; the #1 gas extraction pipeline and the #2 gas extraction pipeline are connected by connecting valve F2 located between the air inlet valves of pumps #2 and #3; the outlet ends of the vent valves of pumps #1, #2, #3, and #4 are all connected to the vent pipeline. Pumps #1, #2, #3, and #4 are arranged side by side. A connecting valve F1 is installed between the inlet valves Qb1 and Qb2 of pumps #1 and #2; a connecting valve F2 is installed between the inlet valves Qb2 and Qb3 of pumps #2 and #3; and a connecting valve F3 is installed between the inlet valves Qb3 and Qb4 of pumps #3 and #4. A bypass valve Q4 connects the gas extraction pipeline #1 to the user-delivery pipeline, and a bypass valve Q44 connects the gas extraction pipeline #2 to the user-delivery pipeline. A connecting valve F4 is installed between the exhaust valves Qb5 and Qb6 of pumps #1 and #2; a connecting valve F5 is installed between the exhaust valves Qb6 and Qb7 of pumps #2 and #3; and a connecting valve F6 is installed between the exhaust valves Qb7 and Qb8 of pumps #3 and #4. The vent valves for pumps #1, #2, #3, and #4 are Qb9, Qb10, Qb11, and Qb12, respectively. Before pumps #1 and #2 start reversing, the valve status is as follows: Pump #1's inlet and exhaust valves Qb1 and Qb5 are open, and the vent valve Qb9 is closed; Pump #2's inlet and exhaust valves Qb2 and Qb6 are closed, and the vent valve Qb10 is closed; Pump #3's inlet and exhaust valves Qb3 and Qb7 are open, and the vent valve Qb11 is closed; Pump #4's inlet and exhaust valves Qb4 and Qb8 are closed, and the vent valve Qb12 is closed; connecting valves F1, F3, F4, F5, and F6 are open, and connecting valve F2 is closed; bypass valves Q4 and Q44 are closed. The pump reversal method includes the following steps: S1: Turn the vent valve of pump #2 to the first set angle. ; S2: Turn the water supply valve of pump #1 back to 0 degrees, and turn the inlet and outlet valves of pump #1 back to the second set angle. ; S3: Press the stop button for pump #1, and at the same time turn the inlet and outlet valves of pump #1 back to 0 degrees. S4: Press the start button for pump #2, and simultaneously open the water supply valve for pump #2. Wait for the intake negative pressure of pump #2 to reach the system negative pressure, and then simultaneously open the intake and exhaust valves of pump #2 to the third set angle. ; S5: Turn the vent valve of pump #2 back to 0 degrees, and then turn the inlet and outlet valves of pump #2 to 90 degrees.

2. The gas pump station pump reversing method according to claim 1, characterized in that: First set angle It is 10 degrees.

3. The gas pump station pump reversing method according to claim 2, characterized in that: Second set angle It is 10 degrees.

4. The gas pump station pump reversing method according to claim 3, characterized in that: Third setting angle The range is 20-30 degrees.

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