Fuel gas system of wellhead gas reciprocating compressor unit
By designing the fuel gas system of the wellhead gas reciprocating compressor unit, the problems of low gas source pressure and high recombinant content are solved, and the gas purification is achieved in multiple aspects, meeting the fuel gas needs of the engine, and ensuring the stable operation of the engine.
Patent Information
- Application Number
- CN202421344943.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-06-13
AI Technical Summary
The gas source pressure at the wellhead site is too low and the heavy component content is high, which cannot directly meet the engine's fuel gas needs, and excessive elements may cause irreversible damage to the engine.
A wellhead gas reciprocating compressor unit fuel gas system is designed, including air inlet, compressor, first cooler, coalescing filter and engine. The system compresses the gas through a compressor, filters the recombinant components through a secondary intake washing tank, reduces the gas temperature by the first cooler, regulates the gas pressure by the pressure reducing valve, and finally improves the gas purity by the coalescing filter.
The wellhead gas is filtered and purified, so that the gas meets the ideal state of the engine in terms of pressure, temperature and purity, meets the engine's long-term demand for fuel gas, and avoids damage to the engine by excessive elements.
Smart Images
Figure CN222558638U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of supporting equipment for a reciprocating compressor unit, in particular to a fuel gas system of a wellhead gas reciprocating compressor unit. Background Art
[0002] As the power equipment in the working process of the reciprocating compressor unit, the engine needs to provide gas as the fuel of the engine to drive the engine to drive the compressor. The current conventional configuration is to use the gas provided by the on-site owner or the original gas on site directly as the engine fuel to drive the engine. However, the working conditions at the wellhead are complex, and the requirements for fuel gas of different models of engines are different. The on-site gas of the owner cannot meet the engine operation requirements in terms of composition and pressure, and the engine has high requirements for the content of various elements. Excessive elements may cause irreversible damage to the engine, and the composition of the fuel gas will have a great impact on the performance of the engine. Therefore, the selection and use of fuel gas are very strict.
[0003] The gas source pressure of the wellhead gas site owner is too low, and the original gas pressure and calorific value of the wellhead gas are low, which cannot meet the long-term fuel gas demand of the engine. At the same time, because the on-site wellhead gas contains a lot of heavy components, and they are recombined and analyzed after the gas is pressurized, it cannot be directly used to drive the engine.
[0004] Therefore, it is necessary to propose a wellhead gas reciprocating compressor unit fuel gas system to filter and purify the wellhead gas on site to meet the engine's demand for fuel gas. Utility Model Content
[0005] The utility model aims to solve the problem that the on-site wellhead gas has too low pressure and high heavy component content, thus being unsuitable for engine use. A wellhead gas reciprocating compressor unit fuel gas system is now provided.
[0006] The technical solution of the utility model is:
[0007] A fuel gas system of a wellhead gas reciprocating compressor unit includes an air intake port, a first cooler, a coalescing filter and an engine, wherein the first cooler is connected to the coalescing filter, a pressure reducing valve is arranged between the first cooler and the coalescing filter, the engine is connected to the coalescing filter, a compressor and a second cooling device are arranged between the air intake port and the first cooler, one end of the compressor is connected to the air intake port, and the other end of the compressor is connected to the second cooler, an air intake washing tank is arranged between the second cooler and the first cooler, one end of the air intake washing tank is connected to the second cooler, and the other end of the air intake washing tank is connected to the first cooler.
[0008] Furthermore, the pressure reducing valve is connected to the first cooler and the coalescing filter respectively through bolts and flanges.
[0009] Furthermore, the air intake scrubber tank is a two-stage air intake scrubber tank.
[0010] Furthermore, the air intake scrubber tank is connected to the first cooler via bolts and a flange.
[0011] Furthermore, the air intake scrubber tank is connected to the second cooler via bolts and a flange.
[0012] Furthermore, the compressor is connected to the second cooler through bolts and a flange, and the compressor is connected to the air intake port through bolts and a flange.
[0013] Furthermore, the accuracy of the coalescing filter is 99.5%.
[0014] The utility model discloses a fuel gas system of a wellhead gas reciprocating compressor unit, in which the wellhead gas in the gas intake port is first compressed by a compressor, and then filtered by a secondary air intake washing tank to filter out the heavy components in the components, thereby realizing the initial filtration and purification of the wellhead gas, and then cooled by a first cooler to make the temperature of the treated wellhead gas meet the requirements, so that it is convenient to pass the gas into a pressure reducing valve for pressure reduction. After the pressure reduction by the pressure reducing valve, the pressure of the gas is reduced, so that the pressure of the wellhead gas at this time also meets the requirements of the engine, and finally the precipitated liquid is filtered out by a coalescing filter, so that the purity of the gas meets the use requirements of the engine. Compared with the traditional technology, the technical scheme enables the wellhead gas to reach the ideal state of engine fuel gas in terms of pressure, temperature and purity, thereby meeting the use requirements of the engine for fuel gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a structural reference diagram of the utility model.
[0016] Figure numerals: 1. air intake port; 2. first cooler; 3. coalescing filter; 4. engine; 5. pressure reducing valve; 6. compressor; 7. second cooler; 8. air intake washing tank. DETAILED DESCRIPTION
[0017] In order to make the technical means, technical features, utility model objectives and technical effects achieved by the utility model easy to understand, the utility model is further explained below with reference to specific illustrations.
[0018] Embodiment 1:
[0019] like Figure 1As shown, this embodiment provides a wellhead gas reciprocating compressor unit fuel gas system, including an air intake port 1, a first cooler 2, a coalescing filter 3 and an engine 4, wherein the first cooler 2 is connected to the coalescing filter 3, a pressure reducing valve 5 is arranged between the first cooler 2 and the coalescing filter 3, the engine 4 is connected to the coalescing filter 3, a compressor 6 and a second cooling device are arranged between the air intake port 1 and the first cooler 2, one end of the compressor 6 is connected to the air intake port 1, and the other end of the compressor 6 is connected to the second cooler 7, an air intake washing tank 8 is arranged between the second cooler 7 and the first cooler 2, one end of the air intake washing tank 8 is connected to the second cooler 7, and the air intake washing tank 8 is connected to the second cooler 7. The other end of the washing tank 8 is connected to the first cooler 2. Preferably, the pressure reducing valve 5 is connected to the first cooler 2 and the coalescing filter 3 respectively by bolts and flanges. Preferably, the air intake washing tank 8 is a two-stage air intake washing tank 8. Preferably, the air intake washing tank 8 is connected to the first cooler 2 by bolts and flanges. Preferably, the air intake washing tank 8 is connected to the second cooler 7 by bolts and flanges. Preferably, the compressor 6 is connected to the second cooler 7 by bolts and flanges. The compressor 6 is connected to the air intake 1 by bolts and flanges. Preferably, the accuracy of the coalescing filter 3 is 99.5%, which can effectively filter the precipitated liquid and ensure the stable operation of the engine 4.
[0020] During operation, the wellhead gas in the air intake 1 is first compressed by the compressor 6, and then filtered by the secondary air intake washing tank 8 to filter out the heavy components in the components, thereby realizing the initial filtration and purification of the wellhead gas. After that, it is cooled by the first cooler 2 to make the temperature of the treated wellhead gas meet the requirements, so that it is convenient to enter the pressure reducing valve 5 for decompression. After the pressure reduction by the pressure reducing valve 5, the pressure of the gas is reduced, so that the pressure of the wellhead gas at this time also meets the requirements of the engine 4. Finally, the precipitated liquid is filtered out by the coalescing filter 3, so that the purity of the gas meets the use requirements of the engine 4. Compared with the traditional technology, the technical solution makes the wellhead gas reach the ideal state of the engine 4 fuel gas in terms of pressure, temperature and purity, and meets the use requirements of the engine 4 for the fuel gas.
[0021] The ideal conditions for engine fuel gas are: pressure 0.3-0.4MPa, temperature 50-60℃, flow rate 300m3 / h. Before the compressor unit is started, there is raw gas from the wellhead gas in the pipeline, but because the raw gas has more heavy components and lower calorific value, it can only provide the fuel gas required for the engine to work briefly in the early stage of the unit start-up. After the unit is started, the raw gas is compressed and cooled by the first stage of the compressor, and is taken out after being filtered by the second stage of the intake scrubber. At this time, the heavy components in the raw gas have been precipitated and filtered out, but the gas used as engine fuel gas at this time does not meet the engine requirements in terms of temperature and pressure, so the gas taken out needs to be cooled by the cooler and reduced by the pressure reducing valve. The gas is cooled by the cooler to reduce the gas temperature to 60℃, and then the cooled gas is reduced by the pressure reducing valve. The set pressure of the pressure reducing valve is 0.4MPa. After cooling and pressure reducing, the temperature and pressure of the gas have reached the ideal requirements of the engine for fuel gas. However, after the compressed gas is cooled and decompressed, liquid will precipitate out. Therefore, after passing through the cooler and the pressure reducing valve, a coalescing filter with an accuracy of 99.5% is used to filter out the precipitated liquid. After filtering through the coalescing filter, the purity of the gas meets the requirements of the engine for fuel gas. By calculating the pressure and temperature loss of the gas during the process of passing through the coalescing filter and the pipeline, the pressure of the fuel gas entering the engine is guaranteed to be 0.3-0.4MPa, the temperature is 50-60℃, and the fuel gas reaches the ideal state of the engine fuel gas in terms of pressure, temperature and purity. The rated power of this engine is 1351KW. After the software simulation of the engine manufacturer, the power of the engine can reach 100% full power output under the drive of the fuel gas processed by this process. The gas extraction point of the fuel gas is located on the process gas pipeline of the unit. In principle, as long as the unit is working, there will be a steady stream of fuel gas through the gas extraction point after cooling, decompression and impurity removal of the process flow into the combustion chamber of the engine, so that as long as the unit is not actively shut down, the unit can achieve continuous operation for a long time.
[0022] The above description is only a preferred embodiment of the utility model, and is not intended to limit the scope of implementation of the utility model. That is, all equivalent changes and modifications made according to the content of the patent application scope of the utility model should belong to the technical scope of the utility model.
Claims
1. A fuel gas system for a wellhead gas reciprocating compressor unit, characterized in that: The invention comprises an air intake port (1), a first cooler (2), a coalescing filter (3) and an engine (4), wherein the first cooler (2) is connected to the coalescing filter (3), a pressure reducing valve (5) is arranged between the first cooler (2) and the coalescing filter (3), the engine (4) is connected to the coalescing filter (3), a compressor (6) and a second cooling device are arranged between the air intake port (1) and the first cooler (2), one end of the compressor (6) is connected to the air intake port (1), and the other end of the compressor (6) is connected to the second cooler (7), an air intake washing tank (8) is arranged between the second cooler (7) and the first cooler (2), one end of the air intake washing tank (8) is connected to the second cooler (7), and the other end of the air intake washing tank (8) is connected to the first cooler (2).
2. A fuel gas system for a wellhead gas reciprocating compressor unit according to claim 1, characterized in that: The pressure reducing valve (5) is connected to the first cooler (2) and the coalescing filter (3) respectively via bolts and flanges.
3. A fuel gas system for a wellhead gas reciprocating compressor unit according to claim 1, characterized in that: The air intake scrubber (8) is a secondary air intake scrubber (8).
4. A fuel gas system for a wellhead gas reciprocating compressor unit according to claim 1, characterized in that: The air intake scrubber tank (8) is connected to the first cooler (2) via bolts and a flange.
5. A fuel gas system for a wellhead gas reciprocating compressor unit according to claim 1, characterized in that: The air intake scrubber (8) is connected to the second cooler (7) via bolts and a flange.
6. A fuel gas system for a wellhead gas reciprocating compressor unit according to claim 1, characterized in that: The compressor (6) is connected to the second cooler (7) via bolts and a flange, and the compressor (6) is connected to the air intake port (1) via bolts and a flange.
7. A fuel gas system for a wellhead gas reciprocating compressor unit according to claim 1, characterized in that: The coalescing filter (3) has an accuracy of 99.5%.