CN110242623B - System for recycling residual pressure of high-pressure natural gas and operation method thereof - Google Patents
System for recycling residual pressure of high-pressure natural gas and operation method thereof Download PDFInfo
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- CN110242623B CN110242623B CN201910613020.9A CN201910613020A CN110242623B CN 110242623 B CN110242623 B CN 110242623B CN 201910613020 A CN201910613020 A CN 201910613020A CN 110242623 B CN110242623 B CN 110242623B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000003345 natural gas Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title abstract description 5
- 238000004064 recycling Methods 0.000 title 1
- 239000007789 gas Substances 0.000 claims abstract description 182
- 238000002347 injection Methods 0.000 claims abstract description 85
- 239000007924 injection Substances 0.000 claims abstract description 85
- 230000001105 regulatory effect Effects 0.000 claims abstract description 57
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 230000007423 decrease Effects 0.000 claims description 7
- 230000035939 shock Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 210000000056 organ Anatomy 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011017 operating method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/18—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for compressing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/48—Control
- F04F5/50—Control of compressing pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
一种利用高压天然气余压回收系统及其运行方法，主要应用于我国天然气集气站，该系统包含高压气井、低压气井、多引射入口喷射器以及调节阀；高压气井的高压气体进入喷射器，经过高压喷嘴后，形成低压高速气流，可以引射低压气体进入喷射器，实现高压气井余压回收利用的目的；采用本发明，通过多引射入口喷射器，当高压气井压力大于设计值时，多口低压气井可同时引入喷射器，有效利用高压气井余压，并达到增加引射效果的目的。计算结果表明，采用本发明可以大大提高高压气井余压的回收利用效率，引射比增加30％以上，具有较大的节能效益及社会效益。
A residual pressure recovery system utilizing high-pressure natural gas and its operation method are mainly used in natural gas gathering stations in my country. The system includes high-pressure gas wells, low-pressure gas wells, multi-injection inlet injectors and regulating valves; high-pressure gas from high-pressure gas wells enters the injectors , after passing through the high-pressure nozzle, a low-pressure and high-speed airflow is formed, and the low-pressure gas can be injected into the injector to realize the purpose of recovering and utilizing the residual pressure of the high-pressure gas well; with the present invention, through the multi-injection inlet injector, when the pressure of the high-pressure gas well is greater than the design value , Multiple low-pressure gas wells can be introduced into injectors at the same time to effectively use the residual pressure of high-pressure gas wells and achieve the purpose of increasing the injection effect. Calculation results show that the recovery and utilization efficiency of the residual pressure of high-pressure gas wells can be greatly improved by adopting the invention, and the ejection ratio is increased by more than 30%, which has great energy-saving benefits and social benefits.
Description
技术领域technical field
本发明涉及天然气开采领域，本发明特别涉及一种利用高压天然气余压回收系统及其运行方法，以实现集气站内的高压气井余压的充分回收。The invention relates to the field of natural gas exploitation, and particularly relates to a system for recovering the residual pressure of high-pressure natural gas and its operating method, so as to fully recover the residual pressure of high-pressure gas wells in a gas gathering station.
背景技术Background technique
目前国内的天然气开采方案中，高压气井正常生产时需要节流降压至外输压力，高压气井的能量浪费在节流阀上；而集气站内又存在低压气井，因其管线压力低于外输压力而无法正常生产；一方面高压井压力没有充分利用，而驱动低压天然气生产的压缩机又需消耗额外的能量。本发明提出一种高压天然气余压(高压井与外输压力间的压差)回收系统及其运行方法，采用多引射入口喷射器，即利用高压气井的能量将多股低压气井采出气加压，使低压气井采出气压力达到采出气外输压力的要求，从而达到有效利用高压气井的能量，实现节能降耗的目的。In the current domestic natural gas exploitation plan, the normal production of high-pressure gas wells needs to be throttled and lowered to the external pressure, and the energy of high-pressure gas wells is wasted on the throttle valve; and there are low-pressure gas wells in the gas gathering station, because the pipeline pressure is lower than the external pressure. On the one hand, the pressure of the high-pressure well is not fully utilized, and the compressor driving the production of low-pressure natural gas needs to consume extra energy. The invention proposes a high-pressure natural gas residual pressure (pressure difference between the high-pressure well and the external pressure) recovery system and its operation method, using multi-injection inlet injectors, that is, using the energy of high-pressure gas wells to increase the output gas of multiple low-pressure gas wells. Pressure, so that the pressure of the gas produced by the low-pressure gas well meets the requirements of the output pressure of the produced gas, so as to effectively use the energy of the high-pressure gas well and achieve the purpose of saving energy and reducing consumption.
发明内容Contents of the invention
为了实现集气站内高压气井余压的充分回收利用，本发明提供了一种利用高压天然气余压回收系统及其运行方法。In order to fully recover and utilize the residual pressure of a high-pressure gas well in a gas gathering station, the present invention provides a system for recovering the residual pressure using high-pressure natural gas and an operating method thereof.
为了实现上述目的，本发明采用的技术方案是：In order to achieve the above object, the technical scheme adopted in the present invention is:
一种利用高压天然气余压回收系统，包括高压气井A，高压气井A来气分为两路，一路经过第二调节阀2进入总机关3，另一路经过第一调节阀1进入喷射器4的工作气体入口；A recovery system utilizing high-pressure natural gas residual pressure, including a high-pressure gas well A, the gas from the high-pressure gas well A is divided into two paths, one path enters the general mechanism 3 through the second regulating valve 2, and the other path enters the injector 4 through the first regulating valve 1 Working gas inlet;
第一低压气井B，第一低压气井B来气分为两路，一路经过第四调节阀12进入总机关3，另一路经过第三调节阀11进入喷射器4的引射入口；The first low-pressure gas well B, the gas from the first low-pressure gas well B is divided into two paths, one path enters the general mechanism 3 through the fourth regulating valve 12, and the other path enters the injection inlet of the injector 4 through the third regulating valve 11;
第二低压气井C，第二低压气井C来气分为两路，一路经过第六调节阀22进入总机关3，另一路经过第五调节阀21进入喷射器4的引射入口；The second low-pressure gas well C, the gas from the second low-pressure gas well C is divided into two paths, one path enters the general mechanism 3 through the sixth regulating valve 22, and the other path enters the injection inlet of the injector 4 through the fifth regulating valve 21;
第三低压气井D，第三低压气井D来气分为两路，一路经过第八调节阀32进入总机关3，另一路经过第七调节阀31进入喷射器4的引射入口；The gas from the third low-pressure gas well D and the third low-pressure gas well D are divided into two paths, one path enters the general mechanism 3 through the eighth regulating valve 32, and the other path enters the injection inlet of the injector 4 through the seventh regulating valve 31;
喷射器4出口与总机关相连，从入口到出口包括依次连通的高压喷嘴5、混合腔喉部6和扩压室7，喷射器4具有一个工作流体入口8和三个引射入口。The outlet of the injector 4 is connected to the main body, and includes a high-pressure nozzle 5, a mixing chamber throat 6 and a diffuser chamber 7 connected in sequence from the inlet to the outlet. The injector 4 has a working fluid inlet 8 and three injection inlets.
所述喷射器4的三个引射入口分别为第一引射入口9、第二引射入口10和第三引射入口11，其中第一引射入口9为主引射入口位于高压喷嘴5处，第二引射入口10和第三引射入口11为辅助引射入口；第二引射入口10位于混合腔喉部6侧壁，第三引射入口11位于扩压室7侧壁。The three injection inlets of the injector 4 are respectively the first injection inlet 9, the second injection inlet 10 and the third injection inlet 11, wherein the first injection inlet 9 is the main injection inlet located at the high-pressure nozzle 5 , the second injection inlet 10 and the third injection inlet 11 are auxiliary injection inlets; the second injection inlet 10 is located on the side wall of the throat 6 of the mixing chamber, and the third injection inlet 11 is located on the side wall of the diffuser chamber 7 .
进入三个引射入口的低压气井存在压差，其中压力最高的低压气井连通第一引射入口9，压力最低的低压气井连通第二引射入口10，压力中间值的气井连通第三引射入口11。There is a pressure difference in the low-pressure gas wells entering the three injection inlets. Among them, the low-pressure gas well with the highest pressure is connected to the first injection inlet 9, the low-pressure gas well with the lowest pressure is connected to the second injection inlet 10, and the gas well with an intermediate pressure is connected to the third injection inlet. Entrance 11.
所述的一种利用高压天然气余压回收系统的运行方法，工作时，关闭高压气井A管路上的第二调节阀2，打开第一调节阀1，使得高压气进入喷射器4；为了充分利用高压气井余压，引入多口低压气井，首先关闭第一低压气井B即压力最高的低压气井管路上的第四调节阀12，打开第一低压气井B的第三调节阀11，使得第一低压气井B中的来气进入第一引射入口9；然后关闭第二低压气井C即压力次高的低压气井管路上的第六调节阀22，打开第二低压气井C的第五调节阀21，使得第二低压气井C中的来气进入第二引射入口10；最后，关闭第三低压气井D即压力最低的低压气井管路上的第八调节阀32，打开第三低压气井D的第七调节阀31，使得第三低压气井D中的来气进入第三引射入口11；在喷射器4中，高压气经过高压喷嘴5变成高速气流，其压力降低在混合腔喉部6造成低压环境，从而可以引射从第一引射入口9进来的低压气，在两股气流在混合腔喉部6内混合会产生一系列激波和膨胀波，随后进入扩压室7，混合气体速度降低，压力升高，随后流出喷射器4，进入总机关3，最后经处理后送入下一个集气站；但是当高压气工作压力大于设计压力时，此时因为高压气体膨胀，使得引射气体流道面积变窄，引射性能反而下降；但在混合腔喉部6和扩压室7内，因为激波和膨胀波的存在，存在低压区，因此在这两个部位的低压区安装第二引射入口10和第三引射入口11，可以有效利用高压气体余压，达到高压天然气余压回收的目的；而在混合腔喉部6和扩压室7内的低压区域位置与高压气体压力高低密切相关，因此调节阀具体开关与否需要查看总流量变化情况决定，打开低压气井相关阀门后，总流量增加，则可以打开该阀门；若打开该阀门使得总流量减小，则需要关闭该低压气井，或者调高高压气井A的进站压力。A kind of described operation method that utilizes high-pressure natural gas residual pressure recovery system, when working, close the second regulating valve 2 on the high-pressure gas well A pipeline, open the first regulating valve 1, make the high-pressure gas enter the ejector 4; in order to make full use of High-pressure gas well residual pressure, introduce multiple low-pressure gas wells, first close the fourth regulating valve 12 on the pipeline of the first low-pressure gas well B, that is, the highest-pressure low-pressure gas well, and open the third regulating valve 11 of the first low-pressure gas well B, so that the first low-pressure gas well B The incoming gas in the gas well B enters the first injection inlet 9; then close the second low-pressure gas well C, that is, the sixth regulating valve 22 on the second-highest low-pressure gas well pipeline, and open the fifth regulating valve 21 of the second low-pressure gas well C, The incoming gas in the second low-pressure gas well C enters the second injection inlet 10; finally, close the eighth regulating valve 32 on the pipeline of the third low-pressure gas well D, which is the lowest pressure gas well, and open the seventh valve of the third low-pressure gas well D. Regulate the valve 31 so that the incoming gas from the third low-pressure gas well D enters the third injection inlet 11; in the injector 4, the high-pressure gas passes through the high-pressure nozzle 5 and becomes a high-speed air flow, and its pressure drops to cause a low pressure at the throat 6 of the mixing chamber Environment, so that the low-pressure gas that comes in from the first injection inlet 9 can be introduced, and a series of shock waves and expansion waves will be generated when the two air flows are mixed in the throat 6 of the mixing cavity, and then enter the diffusion chamber 7, and the velocity of the mixed gas The pressure decreases, the pressure rises, and then flows out of the ejector 4, enters the general mechanism 3, and finally is sent to the next gas gathering station after being processed; but when the working pressure of the high-pressure gas is greater than the design pressure, at this time because the high-pressure gas expands, the injection The area of the gas flow channel is narrowed, and the ejection performance is reduced; but in the throat of the mixing chamber 6 and the diffuser chamber 7, there are low-pressure areas due to the existence of shock waves and expansion waves, so install The second injection inlet 10 and the third injection inlet 11 can effectively utilize the residual pressure of high-pressure gas to achieve the purpose of recovering the residual pressure of high-pressure natural gas; The gas pressure is closely related to the high and low, so whether the specific opening and closing of the regulating valve needs to be determined by checking the change of the total flow rate. After opening the relevant valve of the low-pressure gas well, the total flow rate increases, and the valve can be opened; if the valve is opened to reduce the total flow rate, it is necessary to Shut down the low-pressure gas well, or increase the inlet pressure of the high-pressure gas well A.
通过上述措施，本发明可有效利用高压气井余压，并实现多口低压气井的正常生产。Through the above measures, the present invention can effectively utilize the residual pressure of high-pressure gas wells and realize the normal production of multiple low-pressure gas wells.
与现有技术相比，本发明的优点如下：Compared with prior art, advantage of the present invention is as follows:
(1)节能效果大。高压气井的高压气体进入喷射器，经过高压喷嘴后，形成低压高速气流，可以引射低压气体进入喷射器，本发明系统可以有效提高高压气井余压的回收利用效率，相比原喷射器技术，在变工况情况下其引射比增加30％以上，具有较大的节能效益及社会效益。(1) Great energy saving effect. The high-pressure gas from the high-pressure gas well enters the injector, and after passing through the high-pressure nozzle, a low-pressure and high-speed airflow is formed, which can inject low-pressure gas into the injector. The system of the present invention can effectively improve the recovery and utilization efficiency of the residual pressure of the high-pressure gas well. Compared with the original injector technology, In the case of variable working conditions, the injection ratio increases by more than 30%, which has great energy-saving and social benefits.
(2)对气井适应性较好。与现有系统相比，本发明提出的系统中当高压气井压力大于设计值时，可引入多口低压气井，实现了高压气井余压梯级利用。(2) Good adaptability to gas wells. Compared with the existing system, in the system proposed by the present invention, when the pressure of the high-pressure gas well is greater than the design value, multiple low-pressure gas wells can be introduced to realize the cascade utilization of the residual pressure of the high-pressure gas well.
(3)经济效应好。(3) The economic effect is good.
本发明装置简单，加工经济方便，运行灵活可靠。The device of the invention is simple, the processing is economical and convenient, and the operation is flexible and reliable.
附图说明Description of drawings
图1是本发明系统结构示意图。Fig. 1 is a schematic diagram of the system structure of the present invention.
图2是多引射入口喷射器结构示意图。Fig. 2 is a structural schematic diagram of a multi-injection inlet injector.
高压气井A、第一低压气井B、第二低压气井C、第三低压气井D、第一调节阀1、第二调节阀2、第三调节阀11、第四调节阀12、第五调节阀21、第六调节阀22、第七调节阀31、第八调节阀32；总机关3，喷射器4，高压喷嘴5，混合腔喉部6，扩压室7，工作气体入口8，第一引射入口9、第二引射入口10、第三引射入口11。High-pressure gas well A, first low-pressure gas well B, second low-pressure gas well C, third low-pressure gas well D, first regulating valve 1, second regulating valve 2, third regulating valve 11, fourth regulating valve 12, fifth regulating valve 21. The sixth regulating valve 22, the seventh regulating valve 31, the eighth regulating valve 32; the main mechanism 3, the injector 4, the high-pressure nozzle 5, the throat of the mixing chamber 6, the diffuser chamber 7, the working gas inlet 8, the first An injection inlet 9 , a second injection inlet 10 , and a third injection inlet 11 .
具体实施方式Detailed ways
下面结合附图和实施例详细说明本发明的实施方式。The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.
如图1所示，本发明一种利用高压天然气余压回收系统，包括高压气井A，高压气井A来气分为两路，一路经过第二调节阀2进入总机关3，另一路经过第一调节阀1进入喷射器4的工作气体入口；第一低压气井B，第一低压气井B来气分为两路，一路经过第四调节阀12进入总机关3，另一路经过第三调节阀11进入喷射器4的引射入口；第二低压气井C，第二低压气井C来气分为两路，一路经过第六调节阀22进入总机关3，另一路经过第五调节阀21进入喷射器4的引射入口；第三低压气井D，第三低压气井D来气分为两路，一路经过第八调节阀32进入总机关3，另一路经过第七调节阀31进入喷射器4的引射入口；喷射器4出口与总机关相连。As shown in Figure 1, the present invention utilizes a high-pressure natural gas residual pressure recovery system, including a high-pressure gas well A, and the gas from the high-pressure gas well A is divided into two paths, one path passes through the second regulating valve 2 and enters the general mechanism 3, and the other path passes through the first The regulating valve 1 enters the working gas inlet of the injector 4; the first low-pressure gas well B, the gas from the first low-pressure gas well B is divided into two routes, one route passes through the fourth regulating valve 12 and enters the general mechanism 3, and the other route passes through the third regulating valve 11 Enter the injection inlet of the injector 4; the second low-pressure gas well C, the gas from the second low-pressure gas well C is divided into two paths, one path enters the general mechanism 3 through the sixth regulating valve 22, and the other path enters the injector through the fifth regulating valve 21 4; the third low-pressure gas well D, the gas from the third low-pressure gas well D is divided into two paths, one path enters the general mechanism 3 through the eighth regulating valve 32, and the other path enters the ejector 4 through the seventh regulating valve 31. Injection inlet; injector 4 outlet links to each other with main body.
如图2所示，喷射器4从入口到出口包括依次连通的高压喷嘴5、混合腔喉部6和扩压室7，喷射器4具有一个工作流体入口8和三个引射入口。As shown in FIG. 2 , the injector 4 includes a high-pressure nozzle 5 , a mixing cavity throat 6 and a diffuser chamber 7 connected in sequence from the inlet to the outlet. The injector 4 has a working fluid inlet 8 and three injection inlets.
如图2所示，所述喷射器4的三个引射入口分别为第一引射入口9、第二引射入口10和第三引射入口11，其中第一引射入口9为主引射入口位于高压喷嘴5处，第二引射入口10和第三引射入口11为辅助引射入口；第二引射入口10位于混合腔喉部6侧壁，第三引射入口11位于扩压室7侧壁。As shown in Figure 2, the three injection inlets of the injector 4 are respectively the first injection inlet 9, the second injection inlet 10 and the third injection inlet 11, wherein the first injection inlet 9 is the main injection inlet. The injection port is located at the high-pressure nozzle 5, and the second injection port 10 and the third injection port 11 are auxiliary injection ports; the second injection port 10 is located on the side wall of the throat 6 of the mixing chamber, and the third injection port 11 is located at the expansion port. Pressure chamber 7 side walls.
进入三个引射入口的低压气井存在压差，其中压力最高的低压气井连通第一引射入口9，压力最低的低压气井连通第二引射入口10，压力中间值的气井连通第三引射入口11。There is a pressure difference in the low-pressure gas wells entering the three injection inlets. Among them, the low-pressure gas well with the highest pressure is connected to the first injection inlet 9, the low-pressure gas well with the lowest pressure is connected to the second injection inlet 10, and the gas well with an intermediate pressure is connected to the third injection inlet. Entrance 11.
本发明系统的运行方法如下：The operating method of the system of the present invention is as follows:
工作时，关闭高压气井A管路上的第二调节阀2，打开第一调节阀1，使得高压气进入喷射器4；为了充分利用高压气井余压，可以引入多口低压气井，首先关闭第一低压气井B(压力最高的低压气井)管路上的第四调节阀12，打开第一低压气井B的第三调节阀11，使得第一低压气井B中的来气进入第一引射入口9；然后关闭第二低压气井C(压力次高的低压气井)管路上的第六调节阀22，打开第二低压气井C的第五调节阀21，使得第二低压气井C中的来气进入第二引射入口10；最后，关闭第三低压气井D(压力最低的低压气井)管路上的第八调节阀32，打开第三低压气井D的第七调节阀31，使得第三低压气井D中的来气进入第三引射入口11；在喷射器4中高压气经过高压喷嘴5变成高速气流，其压力降低在混合腔喉部6造成低压环境，从而可以引射从第一引射入口9进来的低压气，在两股气流在混合腔喉部6内混合会产生一系列激波和膨胀波，随后进入扩压室7，混合气体速度降低，压力升高，随后流出喷射器4，进入总机关3，最后经处理后送入下一个集气站；但是当高压气工作压力大于设计压力时，此时因为高压气体膨胀，使得引射气体流道面积变窄，引射性能反而下降；但在混合腔喉部6和扩压室7内，因为激波和膨胀波的存在，存在低压区，因此在这两个部位的低压区安装第二引射入口10和第三引射入口11，可以有效利用高压气体余压，达到高压天然气余压回收的目的；而在混合腔喉部6和扩压室7内的低压区域位置与高压气体压力高低密切相关，因此具体开关与否需要查看总流量变化情况决定，打开低压气井相关阀门后，总流量增加，则可以打开该阀门；若打开该阀门使得总流量减小，则需要关闭该气井，或者调高高压气井A的进站压力。When working, close the second regulating valve 2 on the high-pressure gas well A pipeline, open the first regulating valve 1, so that the high-pressure gas enters the injector 4; The fourth regulating valve 12 on the low-pressure gas well B (the highest low-pressure gas well) pipeline opens the third regulating valve 11 of the first low-pressure gas well B, so that the incoming gas in the first low-pressure gas well B enters the first injection inlet 9; Then close the sixth regulating valve 22 on the pipeline of the second low-pressure gas well C (the second highest low-pressure gas well), open the fifth regulating valve 21 of the second low-pressure gas well C, so that the incoming gas in the second low-pressure gas well C enters the second Injection inlet 10; Finally, close the eighth regulating valve 32 on the pipeline of the third low-pressure gas well D (the lowest low-pressure gas well) pipeline, open the seventh regulating valve 31 of the third low-pressure gas well D, so that in the third low-pressure gas well D Incoming air enters the third injection inlet 11; in the injector 4, the high-pressure gas passes through the high-pressure nozzle 5 and becomes a high-speed air flow, and its pressure decreases to cause a low-pressure environment at the throat 6 of the mixing chamber, so that it can be injected from the first injection inlet 9 The incoming low-pressure gas will generate a series of shock waves and expansion waves when the two air streams are mixed in the throat 6 of the mixing chamber, and then enter the diffuser chamber 7, the speed of the mixed gas decreases, the pressure increases, and then flows out of the ejector 4 and enters the Headquarters 3, finally processed and sent to the next gas-gathering station; but when the working pressure of the high-pressure gas is greater than the design pressure, at this time, due to the expansion of the high-pressure gas, the area of the injection gas flow channel is narrowed, and the injection performance decreases instead; But in the mixing cavity throat 6 and the diffuser chamber 7, because of the existence of the shock wave and the expansion wave, there is a low-pressure area, so the second injection inlet 10 and the third injection inlet 11 are installed in the low-pressure area of these two parts , can effectively use the residual pressure of high-pressure gas to achieve the purpose of recovering the residual pressure of high-pressure natural gas; and the position of the low-pressure area in the throat 6 of the mixing chamber and the diffuser chamber 7 is closely related to the pressure of the high-pressure gas, so it is necessary to check whether the specific switch or not The change of the total flow rate determines that after opening the relevant valve of the low-pressure gas well, the total flow rate increases, and the valve can be opened; if the valve is opened to reduce the total flow rate, the gas well needs to be closed, or the inlet pressure of the high-pressure gas well A must be increased.
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