Direct injection type natural gas desulfurization skid system

Abstract

A direct injection type natural gas desulfurization skid system comprises a skid bottom plate (1) and a guardrail (2), the skid bottom plate (1) is mounted in the guardrail (2), and the direct injection type natural gas desulfurization skid system is characterized in that a first gas-liquid separator (4) is communicated with a natural gas source, and a gas outlet of the first gas-liquid separator (4) is communicated with a gas inlet of a second gas-liquid separator (5); desulfurization waste liquid generated by the first gas-liquid separator (4) is discharged out of the skid system through a desulfurization waste liquid pipeline (42); purified natural gas at a gas outlet of the second gas-liquid separator (5) is fed into a natural gas pipe network, and a pre-desulfurizer of the second gas-liquid separator (5) is fed into the circulating pump (6); and the liquid supplementing pump (8) is used for pumping one part of a fresh desulfurizing agent into the pre-flow-removing pipeline (41) and the circulating pump (6). The desulfurization reagent is recycled, the desulfurization efficiency is improved, and precipitation is avoided. And the device can be flexibly allocated among various sulfur-containing gas wells.

Description

Technical Field

[0001] The utility model relates to a natural gas purification technology, in particular to a natural gas desulfurization processing technology, specifically to a direct injection type natural gas desulfurization skid system. Background Art

[0002] As the cleanest and most efficient primary energy source, natural gas is developing rapidly in my country. With the development of a large number of gas fields, the utilization rate of natural gas in my country is gradually increasing, and the upstream and downstream markets of natural gas are also gradually expanding. However, the natural gas raw materials extracted from gas fields generally contain H 2 S, CO 2 and organic sulfides, etc., cannot be used directly in industrial production and residents’ lives. The above acidic gases need to be purified and removed before they can be further used. 2 Sulfur not only pollutes the atmosphere, but also causes catalyst poisoning and pipe corrosion during the use and transportation of natural gas. Therefore, the desulfurization process of natural gas is an extremely important part of the natural gas process system.

[0003] At present, the mainstream solutions for natural gas desulfurization at home and abroad mostly use various desulfurization reagents to absorb and remove hydrogen sulfide. 2 The S concentration can be divided into the direct injection method of spraying the desulfurization reagent directly into the pipeline, and the absorption tower method of spraying and circulating the desulfurization reagent.

[0004] In the engineering application of the above process system, the following problems still exist. 1. Incomplete reaction of desulfurization reagent: the desulfurization reagent is directly discharged after one spray in the pipeline, and desulfurization waste liquid still contains desulfurization reagent, resulting in reagent waste; 2. Sedimentation and blockage problem: in long-term operation, the desulfurization reagent and H 2 When the S reaction is oversaturated or the replacement is delayed, the excess hydrogen sulfide hydrolyzes HS - It is easy to react with the desulfurization products and produce precipitation in the absorption tower, thereby blocking the pipeline and pump, affecting the safe operation of the entire system. However, it is difficult to complete the monitoring and separation of precipitation when the desulfurization liquid is repeatedly circulated in the commonly used desulfurization process; 3. The desulfurization system lacks linkage: when the natural gas processing volume fluctuates, H 2 When the sulfur concentration changes or the efficiency of the desulfurization reagent fluctuates, it is impossible to complete the adjustment through automatic control, which wastes manpower and material resources; 4. When the sulfur-containing gas wells are dispersed, it is difficult to complete the collection of multiple dispersed gas wells with a single system, which lacks flexibility.

[0005] Therefore, it is urgent to develop an advanced natural gas desulfurization process system to optimize the above engineering problems. Utility Model Content

[0006] Aiming at the problems existing in the existing natural gas desulfurization treatment process, such as incomplete reaction of desulfurization reagents, clogging of pipelines and pump bodies by precipitation in pipelines during long-term operation, lack of interlocking control and insufficient flexibility, the utility model designs a direct injection natural gas desulfurization skid system with high desulfurization efficiency, strong automatic control capability, low precipitation clogging rate and high flexibility.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A direct injection type natural gas desulfurization skid system comprises a skid bottom plate 1 and a guardrail 2, wherein the skid bottom plate 1 is installed in the guardrail 2, and is characterized in that: a gas-liquid separator No. 1 4, a gas-liquid separator No. 2 5, a circulation pump 6 and a liquid replenishing pump 8 are installed on the skid bottom plate 1, the gas-liquid separator No. 1 4 is connected to a natural gas source through a natural gas inlet pipeline 3, the pre-desulfurized natural gas at the gas outlet of the gas-liquid separator No. 1 4 is connected to the gas inlet of the gas-liquid separator No. 2 5 through a pre-desulfurization pipeline 41, and the desulfurized waste liquid generated by the gas-liquid separator No. 1 4 is discharged out of the skid system through a desulfurized waste liquid pipeline 42; the purified natural gas at the gas outlet of the gas-liquid separator No. 2 5 is connected to the gas outlet of the gas-liquid separator No. 1 The pipeline 51 is sent into the natural gas pipeline network, the pre-desulfurizer produced by the No. 2 gas-liquid separator 5 is sent to the circulation pump 6 through the pre-desulfurizer pipeline 52, and the circulation pump 6 pumps the pre-desulfurizer into the natural gas intake pipeline 3, mixes with the natural gas, and then sends it to the No. 1 gas-liquid separator 4 to realize direct injection natural gas desulfurization; the liquid replenishment pump 8 pumps a part of the fresh desulfurizer input through the fresh desulfurizer pipeline 7 into the pre-desulfurization pipeline 41, mixes with the pre-desulfurized natural gas therein, and then sends it to the No. 2 gas-liquid separator 5, and the other part is pumped into the circulation pump 6 and pumped into the natural gas intake pipeline 3 together with the pre-desulfurizer flowing in through the pre-desulfurizer pipeline 52, and then mixed with the natural gas and sent to the No. 1 gas-liquid separator 4.

[0009] The desulfurization waste liquid pipeline 42 of the first gas-liquid separator 4 is equipped with a detection H 2 The first analytical instrument device 9 can detect the concentration of sulfur, the concentration of desulfurizer, the pH value and the concentration of sediment and can upload data, and reflects the working state of the desulfurization system by detecting the parameters of the desulfurized waste liquid; the natural gas outlet pipeline 51 is equipped with a detection device for detecting H 2 A second analytical instrument device 10 that can measure S concentration and upload data.

[0010] The first analytical instrument device 9 and the second analytical instrument device 2 can realize interlocking control and regulation with the liquid replenishment pump 8 and the circulation pump 6 .

[0011] The desulfurization skid system can be moved and assembled to be applied to different flow rates, different H 2 Desulfurization system engineering for natural gas fields with high sulfur concentration.

[0012] The utility model adopts the separated liquid of the second gas-liquid separator which has completed the secondary desulfurization as the pre-desulfurization liquid, directly injects it into the raw material pipeline, reacts with the raw natural gas, completely reacts the residual desulfurizer in the pre-desulfurization liquid, and then discharges it in the form of desulfurization waste liquid.

[0013] The first analytical instrument device 9 can detect H 2 S concentration, desulfurization agent concentration, pH value, and a turbidity meter is provided to detect the sediment concentration, and the state of the desulfurization system is reflected by detecting the parameters of the desulfurization waste liquid; the second analytical instrument device 10 can detect H 2 S concentration, reaction purified natural gas outlet parameter.

[0014] The first analytical instrument device 9 detects the precipitate or H 2 When the S concentration exceeds the preset value, the flow rate of the circulation pump and the replenishment pump is increased to suppress the formation of sediment and reduce the H 2 S concentration; when the desulfurizer concentration is detected to exceed the preset value, the pre-desulfurizer flow rate is reduced by reducing the flow rate of the circulation pump and the replenishment pump to improve the utilization rate of the pre-desulfurizer.

[0015] The second analytical instrument device 10 detects H in the purified natural gas. 2 When the S concentration exceeds the standard, the data analysis of the first analytical instrument device 9 is combined to complete the interlocking control by adjusting the flow rates of the liquid replenishment pump and the circulation pump.

[0016] The beneficial effects of the utility model are:

[0017] 1. Reuse of desulfurization reagents and improved desulfurization efficiency. In the original desulfurization process, the desulfurization reagents were discharged as desulfurization waste liquid after being sprayed once in the pipeline, and some effective desulfurization reagents were still unreacted. This solution sprays the desulfurization waste liquid onto the raw natural gas as a pre-desulfurization agent. Through the monitoring of the analytical instrument device, it can be confirmed that the discharged desulfurization waste liquid does not contain effective reagents, which can increase the desulfurization agent efficiency from the original 60% to more than 95%.

[0018] 2. The reaction process is controllable to avoid precipitation. When the system desulfurization load increases, precipitation is likely to occur in the pipeline, affecting the normal operation of the system. The analytical instrument device is used to monitor the precipitation content in the desulfurization waste liquid, intuitively understand the reaction conditions in the reaction system, and timely adjust the amount of fresh desulfurizer added and the circulation pump flow through chain control to avoid precipitation.

[0019] 3. The system realizes automatic control. The system monitors and purifies natural gas H 2 The system can automatically adjust the S concentration and various parameters of the desulfurization waste liquid, and realize automatic feedback adjustment of the replenishment pump and the circulation pump to achieve automatic operation of the entire system.

[0020] 4. The desulfurization system is skid-based. The system is skid-based and can be flexibly deployed between various sulfur-containing gas wells. After desulfurization is completed in a gas well, it can be moved to the next gas well to continue operations. This is particularly applicable in scenarios where there are many small gas wells and they are scattered. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the system structure of the utility model.

[0022] In the figure: 1—skid bottom plate, 2—guardrail, 3—natural gas inlet pipeline, 4—No. 1 gas-liquid separator, 41—pre-desulfurization pipeline, 42—desulfurization waste liquid pipeline, 5—No. 2 gas-liquid separator, 51—natural gas outlet pipeline, 52—pre-desulfurization agent pipeline, 6—circulation pump, 7—fresh desulfurization agent pipeline, 8—liquid replenishment pump, 9—first analytical instrument device, 10—second analytical instrument device. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1 shown.

[0025] A direct injection natural gas desulfurization skid system includes a skid bottom plate 1, a guardrail 2, a natural gas inlet pipeline 3, a No. 1 gas-liquid separator 4, a pre-desulfurization pipeline 41, a desulfurization waste liquid pipeline 42, a No. 2 gas-liquid separator 5, a natural gas outlet pipeline 51, a pre-desulfurization agent pipeline 52, a circulation pump 6, a fresh desulfurization agent pipeline 7, a liquid replenishment pump 8, a first analytical instrument device 9 (which can be designed and manufactured by yourself or customized from the market), and a second analytical instrument device 10 (which can be designed and manufactured by yourself or customized from the market). The skid bottom plate 1 is surrounded by guardrails 2, and the No. 1 gas-liquid separator 4, the No. 2 gas-liquid separator 5, the circulation pump 6 and the liquid replenishment pump 8 are all located on the skid bottom plate 1. The natural gas inlet pipeline 3 is connected to the inlet of the No. 1 gas-liquid separator 4, and the raw natural gas enters the No. 1 gas-liquid separator 4 through the natural gas inlet pipeline 3. The gas phase outlet of the No. 1 gas-liquid separator 4 is connected to the pre-desulfurization pipeline 41, and the pre-desulfurization pipeline 41 is also connected to the inlet of the No. 2 gas-liquid separator 5; the liquid phase outlet of the No. 1 gas-liquid separator 4 is connected to the desulfurization waste liquid pipeline 42, and the desulfurization waste liquid is finally discharged out of the system through the desulfurization waste liquid pipeline 42.

[0026] The fresh desulfurizer pipeline 7 is connected to the liquid replenishment pump 8, and the fresh desulfurizer enters from the fresh desulfurizer pipeline 7, and enters the pre-desulfurization pipeline 41 after being pressurized by the liquid replenishment pump 8. The fresh desulfurizer is mixed with the pre-desulfurized natural gas and sent to the No. 2 gas-liquid separator 5 together; the gas phase outlet of the No. 2 gas-liquid separator 5 is connected to the natural gas outlet pipeline 51, and the purified natural gas is sent to the pipeline network through the natural gas outlet pipeline 51 for users to use; the liquid phase outlet of the No. 2 gas-liquid separator 5 is connected to the pre-desulfurizer pipeline 52, and the pre-desulfurizer pipeline 52 is also connected to the circulation pump 6, and the circulation pump 6 is connected to the natural gas inlet pipeline 3 through the connecting pipe.

[0027] The first analytical instrument device 9 is located on the desulfurization waste liquid pipeline 42 , and the second analytical instrument device 10 is located on the natural gas outlet pipeline 51 . The analytical instrument devices 9 and 10 are interlockedly controlled with the circulation pump 6 and the liquid replenishment pump 8 .

[0028] The process flow of the utility model is:

[0029] In the skid system, the raw natural gas is purified and discharged from the system after the secondary direct injection deep desulfurization in the pipeline. The specific process is as follows: the raw natural gas is mixed with the pre-desulfurizer in the natural gas inlet pipeline 3 and the pre-desulfurization reaction is completed. The gas-liquid mixture formed enters the No. 1 gas-liquid separator 4, and the desulfurized waste liquid is discharged from the liquid phase outlet of the No. 1 gas-liquid separator 4 through the desulfurized waste liquid pipeline 42. The pre-desulfurized natural gas is discharged from the gas phase outlet of the No. 1 gas-liquid separator 4 and enters the pre-desulfurization pipeline 41. The fresh desulfurizer also enters the pre-desulfurization pipeline 41 after being pressurized by the fresh desulfurizer pipeline 7 and the liquid replenishment pump 8. The two are mixed to complete the secondary desulfurization reaction; then the gas-liquid mixture enters the No. 2 gas-liquid separator 5, and the purified natural gas is discharged from the gas phase outlet of the gas-liquid separator 5 and enters the natural gas transmission network through the natural gas outlet pipeline 51. The pre-desulfurizer is discharged from the liquid phase outlet of the gas-liquid separator 5 and enters the pre-desulfurizer pipeline 52. After being pressurized by the circulation pump 6, it is sprayed into the natural gas intake pipeline 3 to pre-desulfurize the raw natural gas.

[0030] Among them, a first analytical instrument device 9 is provided on the desulfurization waste liquid pipeline 42 to upload the desulfurization waste liquid data; a second analytical instrument device 10 is provided on the natural gas outlet pipeline 51 to upload the purified natural gas data. The desulfurization waste liquid data and the purified natural gas data are fed back to the control system, and the interlocking adjustment is completed by adjusting the liquid replenishment pump 8 and the circulation pump 6.

[0031] The skid system of the utility model is movable and can be applied to different flow rates and different H 2 Desulfurization system engineering for natural gas fields with high sulfur concentration.

[0032] The utility model adopts the separated liquid of the second gas-liquid separator which has completed the secondary desulfurization as the pre-desulfurization liquid, directly injects it into the raw material pipeline, reacts with the raw natural gas, completely reacts the residual desulfurizer in the pre-desulfurization liquid, and then discharges it in the form of desulfurization waste liquid.

[0033] The first analytical instrument device 9 can detect H 2 S concentration, desulfurization agent concentration, pH value, and a sediment concentration detection device such as a turbidity meter is provided to feedback the desulfurization system status by detecting the parameters of the desulfurization waste liquid. The second analytical instrument device 10 can detect H 2 The sulfur concentration is then fed back to the effect of the desulfurization system.

[0034] The first analytical instrument device 9 on the desulfurization waste liquid pipeline detects sediment or H 2 When the S concentration exceeds the preset value, the control system increases the flow rate of the circulation pump 6 and the replenishment pump 8 to inhibit the formation of sediment and reduce the H 2 S concentration; when the desulfurizing agent concentration exceeds the preset value, the control system reduces the flow rate of the pre-desulfurizing agent by reducing the flow rate of the circulation pump 6 and the replenishment pump 8, thereby improving the utilization rate of the pre-desulfurizing agent.

[0035] The second analytical instrument device 10 on the natural gas outlet pipeline detects H 2 When the S concentration exceeds the standard, the control system jointly analyzes the data of the first instrument device 9 and completes the interlocking regulation by adjusting the flow rates of the liquid replenishment pump 8 and the circulation pump 6.

[0036] The specific working conditions and control methods can be shown in the following table.

[0037]

[0038] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A direct injection natural gas desulfurization skid system, comprising a skid bottom plate (1) and a guardrail (2), wherein the skid bottom plate (1) is installed in the guardrail (2), and is characterized by: A No. 1 gas-liquid separator (4), a No. 2 gas-liquid separator (5), a circulation pump (6) and a liquid replenishing pump (8) are installed on the skid bottom plate (1); the No. 1 gas-liquid separator (4) is connected to a natural gas source through a natural gas inlet pipeline (3); the pre-desulfurized natural gas at the outlet of the No. 1 gas-liquid separator (4) is connected to the inlet of the No. 2 gas-liquid separator (5) through a pre-desulfurization pipeline (41); the desulfurized waste liquid generated by the No. 1 gas-liquid separator (4) is discharged out of the skid system through a desulfurized waste liquid pipeline (42); the purified natural gas at the outlet of the No. 2 gas-liquid separator (5) is sent to the natural gas pipeline network through a natural gas outlet pipeline (51); the No. 2 gas-liquid separator (5) The generated pre-desulfurizer is sent to the circulation pump (6) through the pre-desulfurizer pipeline (52). The circulation pump (6) pumps the pre-desulfurizer into the natural gas inlet pipeline (3) to mix with the natural gas and then send it to the first gas-liquid separator (4) to realize direct injection type natural gas desulfurization. The liquid replenishing pump (8) pumps part of the fresh desulfurizer input through the fresh desulfurizer pipeline (7) into the pre-desulfurization pipeline (41) to mix with the pre-desulfurized natural gas therein and then send it to the second gas-liquid separator (5). The other part is pumped into the circulation pump (6) and pumped into the natural gas inlet pipeline (3) together with the pre-desulfurizer flowing in through the pre-desulfurizer pipeline (52) to mix with the natural gas and then send it to the first gas-liquid separator (4).

2. The direct injection natural gas desulfurization skid system according to claim 1 is characterized in that The desulfurization waste liquid pipeline (42) of the first gas-liquid separator (4) is equipped with a first analytical instrument device (9) for detecting H2S concentration, desulfurization agent concentration, pH value and sediment concentration and capable of uploading data, and reflects the working state of the desulfurization system by detecting the parameters of the desulfurization waste liquid; and the natural gas outlet pipeline (51) is equipped with a second analytical instrument device (10) for detecting H2S concentration in natural gas and capable of uploading data.

3. The direct injection natural gas desulfurization skid system according to claim 2 is characterized by: The first analytical instrument device (9) and the second analytical instrument device (10) can realize interlocking control and regulation with the liquid replenishment pump (8) and the circulation pump (6).

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