Purge gas treatment system

Abstract

The utility model provides a purge gas treatment system, which is characterized in that a purge gas recovery device is used for intensively recovering purge gas and conveying the recovered purge gas into a conveying pipeline, and the gas outlet end of the conveying pipeline is respectively connected with a combustible component recycling device and a ground combustion device. The purge gas in the conveying pipeline is conveyed to the combustible component reutilization device for reutilization or conveyed to the ground combustion device for combustion; wherein the combustible component recycling device comprises a third-stage ammonium sulfate section, a fourth-stage ammonium sulfate section, a third-stage desulfurization section and a fourth-stage desulfurization section; the purge gas in the conveying pipeline is conveyed to a third-stage ammonium sulfate section, a fourth-stage ammonium sulfate section, a third-stage desulfurization section and a fourth-stage desulfurization section, or the purge gas in the conveying pipeline is conveyed to the third-stage ammonium sulfate section and the fourth-stage ammonium sulfate section, or conveyed to the third-stage desulfurization section and the fourth-stage desulfurization section. Recycled synthetic ammonia purge gas is reutilized through the combustible component reutilization device, and energy waste and environmental pollution are reduced.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology for synthetic ammonia, and in particular to a purge gas treatment system. Background Technology

[0002] In the process of synthetic ammonia production, the flash vapor from the flash tank is cooled by an ammonia recovery device. After recovering a portion of the liquid ammonia, the gaseous ammonia content is ≤10%, which is then transported to a ground flare for combustion, thus causing certain environmental pollution and wasting energy. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a purge gas treatment system.

[0004] The embodiments of this utility model adopt the following technical solution: a purge gas treatment system, including a purge gas recovery device, a combustible component reuse device, a ground combustion device, and a conveying pipeline;

[0005] The purge gas recovery device is used for centralized recovery of purge gas. The purge gas recovery device is connected to the inlet end of the conveying pipeline to transport the recovered purge gas into the conveying pipeline. The outlet end of the conveying pipeline is connected to the combustible component reuse device and the ground combustion device respectively to transport the purge gas in the conveying pipeline to the combustible component reuse device for reuse or to the ground combustion device for combustion.

[0006] The combustible component recycling device includes a third-phase ammonium sulfate section, a fourth-phase ammonium sulfate section, a third-phase desulfurization section, and a fourth-phase desulfurization section; the vented gas in the conveying pipeline is transported to the third-phase ammonium sulfate section, the fourth-phase ammonium sulfate section, the third-phase desulfurization section, and the fourth-phase desulfurization section, or...

[0007] The vented gas in the pipeline is transported to the Phase III ammonium sulfate section and the Phase IV ammonium sulfate section, or to the Phase III desulfurization section and the Phase IV desulfurization section.

[0008] In some embodiments, the purge gas recovery device includes an ice machine purge gas recovery mechanism, a synthesis flash evaporation tank purge gas recovery mechanism, and a synthesis ammonia recovery mechanism. The ice machine purge gas recovery mechanism and the synthesis flash evaporation tank purge gas recovery mechanism are respectively connected to the synthesis ammonia recovery mechanism through intermediate pipes. The outlet of the synthesis ammonia recovery mechanism is connected to the inlet end of the conveying pipe. A bypass pipe is provided between the intermediate pipe and the conveying pipe.

[0009] In some embodiments, the vent gas treatment system further includes a valve assembly, the valve assembly including a bypass valve, a first shut-off valve, and a second shut-off valve;

[0010] The bypass valve is installed on the bypass pipeline;

[0011] The delivery pipeline has a first branch pipeline and a second branch pipeline. The first branch pipeline is connected to the ground combustion device and is equipped with a first shut-off valve. The second branch pipeline is connected to the combustible component recycling device and is equipped with a second shut-off valve. The first shut-off valve and the second shut-off valve are interlocked by differential pressure.

[0012] In some embodiments, the vent gas treatment system further includes an alarm that triggers an alarm when the pressure difference between the first branch pipe and the second branch pipe exceeds a first preset threshold.

[0013] When the pressure difference between the first branch pipe and the second branch pipe is greater than a second set threshold, the second shut-off valve closes and the first shut-off valve opens, wherein the second set threshold is greater than the first set threshold.

[0014] In some embodiments, the vent gas treatment system further includes a pressure gauge assembly, which includes a first pressure gauge, a second pressure gauge, and a third pressure gauge;

[0015] The first pressure gauge is installed on the conveying pipeline, the second pressure gauge is installed at the air inlet of the third-stage ammonium sulfate section, and the third pressure gauge is installed at the air inlet of the fourth-stage ammonium sulfate section.

[0016] In some embodiments, the bypass valve, the first shut-off valve, and the second shut-off valve are each provided with a handwheel, which is used to manually adjust the opening degree of the bypass valve, the first shut-off valve, and the second shut-off valve, respectively.

[0017] In some embodiments, the vent gas treatment system further includes a control room having a controller, and the valve assembly and the pressure gauge assembly are respectively connected to the controller.

[0018] In some embodiments, the second branch pipeline has four sub-pipes, which are respectively connected to the air inlet of the third-stage ammonium sulfate section, the air inlet of the fourth-stage ammonium sulfate section, the air inlet of the third-stage desulfurization section, and the air inlet of the fourth-stage desulfurization section, and each of the four branch pipelines is equipped with a switch valve.

[0019] In some embodiments, the vent gas treatment system further includes a flow meter disposed on the delivery pipeline for detecting the flow rate of vent gas in the delivery pipeline.

[0020] The beneficial effects of this utility model embodiment are as follows:

[0021] By reusing the recovered synthetic ammonia off-gas through a combustible component recycling device, energy waste is reduced, and environmental pollution is also reduced. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural block diagram of the purge gas treatment system of this utility model.

[0024] Reference numerals: 1. Exhaust gas recovery device; 101. Ice machine exhaust gas recovery mechanism; 102. Synthesis flash tank exhaust gas recovery mechanism; 103. Synthetic ammonia recovery mechanism; 2. Combustible component reuse device; 201. Phase III ammonium sulfate section; 202. Phase IV ammonium sulfate section; 203. Phase III desulfurization section; 204. Phase IV desulfurization section; 3. Ground combustion device; 4. Conveying pipeline; 5. Bypass pipeline; 6. Bypass valve; 7. First shut-off valve; 8. Second shut-off valve; 9. First pressure gauge; 10. Second pressure gauge; 11. Third pressure gauge; 12. Flow meter. Detailed Implementation

[0025] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0026] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0027] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0028] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0029] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0030] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0031] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0032] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0033] This application provides a purge gas treatment system, such as Figure 1 As shown, the system includes a purge gas recovery device 1, a combustible component reuse device 2, a ground combustion device 3, and a conveying pipeline 4. Here, purge gas can refer to synthetic ammonia purge gas.

[0034] The purge gas recovery device 1 is used for centralized recovery of purge gas. It is connected to the inlet end of the conveying pipeline 4 to transport the recovered purge gas into the pipeline 4. The outlet end of the conveying pipeline 4 is connected to both the combustible component reuse device 2 and the ground combustion device 3 to transport the purge gas in the conveying pipeline 4 to the combustible component reuse device 2 for reuse or to the ground combustion device 3 for combustion. Preferably, the purge gas in the conveying pipeline 4 is transported to the combustible component reuse device 2 for reuse, to minimize the direct combustion of purge gas through the ground combustion device 3, thereby maximizing the reuse rate of purge gas and reducing energy waste and environmental pollution caused by direct combustion of purge gas in the ground combustion device 3. Furthermore, the ground combustion device 3 may, but is not limited to, be a ground flare.

[0035] The combustible component recycling unit 2 includes a third-stage ammonium sulfate section 201, a fourth-stage ammonium sulfate section 202, a third-stage desulfurization section 203, and a fourth-stage desulfurization section 204. The vented gas in the conveying pipeline 4 is transported to the third-stage ammonium sulfate section 201, the fourth-stage ammonium sulfate section 202, the third-stage desulfurization section 203, and the fourth-stage desulfurization section 204, or...

[0036] The vented gas in pipeline 4 is transported to the third-phase ammonium sulfate section 201 and the fourth-phase ammonium sulfate section 202, or to the third-phase desulfurization section 203 and the fourth-phase desulfurization section 204.

[0037] In the ammonia synthesis process, the terms "Phase III ammonium sulfate section" and "Phase IV ammonium sulfate section" can be understood as follows: Phase III ammonium sulfate section 201 likely refers to a specific stage or production line in the ammonium sulfate production process. In this stage, raw materials (such as ammonia and sulfuric acid) undergo a series of chemical reactions to produce ammonium sulfate. This process may include the introduction of ammonia, the addition of sulfuric acid, the control of reaction conditions (such as temperature and pressure), and the separation and purification of the products. Phase III ammonium sulfate section 201 may have specific production equipment, process flows, and technical parameters to ensure the quality and yield of the ammonium sulfate product. Similarly, Phase IV ammonium sulfate section 202 is also a stage or production line in the ammonium sulfate production process. However, compared to Phase III, Phase IV ammonium sulfate section 202 may employ different production processes, equipment, or technical parameters. This may be due to changes in market demand, differences in raw material supply, technological upgrades, or optimizations. Phase IV ammonium sulfate section 202 also includes steps such as the introduction of raw materials, chemical reactions, product separation, and purification, but the specific processes may differ.

[0038] For example, under normal operating conditions, the outlet pressure of the purge gas recovery unit 1 is 80 kPa, and the pressure of the existing coke oven gas pipeline at the inlet of the third and fourth phase ammonium sulfate section 202 is 15 kPa. Now, the ammonia recovery purge gas is introduced into the coke oven gas pipeline at the inlet of the third and fourth phase ammonium sulfate section 202 and / or the gas pipeline at the inlet of the precooling tower of the third and fourth phase desulfurization section to recover ammonia and combustible components in the ammonia recovery purge gas.

[0039] This application embodiment reuses the recovered synthetic ammonia purge gas through the combustible component reuse device 2, reducing energy waste and environmental pollution.

[0040] In some embodiments, the purge gas recovery device 1 includes an ice machine purge gas recovery mechanism 101, a synthesis flash tank purge gas recovery mechanism 102, and a synthetic ammonia recovery mechanism 103. The ice machine purge gas recovery mechanism 101 and the synthesis flash tank purge gas recovery mechanism 102 are respectively connected to the synthetic ammonia recovery mechanism 103 through intermediate pipes. The outlet of the synthetic ammonia recovery mechanism 103 is connected to the inlet end of the conveying pipeline 4. A bypass pipe 5 is provided between the intermediate pipe and the conveying pipeline 4, that is, the purge gas recovered by the ice machine purge gas recovery mechanism 101 and the synthesis flash tank purge gas recovery mechanism 102 can be directly conveyed into the conveying pipeline 4 through the bypass pipe 5.

[0041] A bypass valve 6 can be installed on the bypass pipeline 5. The bypass valve 6 can be opened when the purge gas recovered by the ice machine purge gas recovery mechanism 101 and / or the synthesis flash tank purge gas recovery mechanism 102 is delivered to the delivery pipeline 4. The bypass valve 6 can be... Figure 1 PV1623002 in the example.

[0042] The purge gas treatment system further includes a valve assembly. In addition to the bypass valve 6 described above, the valve assembly further includes a first shut-off valve 7 and a second shut-off valve 8. The first shut-off valve 7 and the second shut-off valve 8 can be respectively represented as Figure 1 XV1623001 and XV1623002 in

[0043] The conveying pipeline 4 has a first branch pipeline and a second branch pipeline. The first branch pipeline is connected to the ground combustion device 3, and the first shut-off valve 7 can be provided on the first branch pipeline. The second branch pipeline is connected to the combustible component recycling device 2, and the second shut-off valve 8 can be provided on the second branch pipeline.

[0044] The first shut-off valve 7 and the second shut-off valve 8 have a differential pressure interlock PDIAS1623001, that is, an abnormal state interlock is set for the first switching valve and the second shut-off valve 8. The purge gas treatment system further includes an alarm. When the differential pressure between the first branch pipeline and the second branch pipeline is greater than the first set threshold, the alarm gives an alarm. When the differential pressure between the first branch pipeline and the second branch pipeline is greater than the second set threshold, the second shut-off valve 8 closes and the first shut-off valve 7 opens, where the second set threshold is greater than the first set threshold.

[0045] Specifically, continuing to combine the above embodiments, PDIAS1623001 = ammonia recovery outlet pressure - pressure of the coke oven gas pipeline at the inlet of the existing three-phase and four-phase ammonium sulfate section 202 = 65 KPa. When PDIAS<1623001> 70 KPaG, an alarm is given. When PDIAS<1623001> 75 KPaG, XV1623002 is interlocked and cut off, and XV1623001 is opened. Here, taking the first threshold as 70 KPaG and the second threshold as 75 KPaG as an example. Of course, it can be understood that the specific values of the first threshold and the second threshold can be set according to actual production needs. This is only an example and does not constitute a limitation on the protection scope of the claims.

[0046] When the operating pressure of the coke oven gas pipeline at the inlet of the existing three-phase and four-phase ammonium sulfate section 202 < 5 kPaG, the alarm can give an alarm. When the operating pressure of the coke oven gas pipelines at the inlets of the existing three-phase ammonium sulfate section 201 and the four-phase ammonium sulfate section 202 < 3 kPaG, XV1623002 can be interlocked and cut off, and XV1623001 is opened.

[0047] After the above differential pressure interlock opens XV1623001, the ammonia recovery purge gas can be urgently fed into the ground combustion device 3 for combustion.

[0048] In some embodiments, the purge gas treatment system further includes a pressure gauge assembly. The pressure gauge assembly includes a first pressure gauge 9, a second pressure gauge 10, and a third pressure gauge 11. Combining Figure 1The first pressure gauge 9 can be represented as PT1623002 in the figure, the second pressure gauge 10 can be represented as PT1623003 in the figure, and the third pressure gauge 11 can be represented as PT1623004 in the figure.

[0049] The first pressure gauge 9 is installed on the conveying pipeline 4 to detect the pressure in the conveying pipeline 4. The second pressure gauge 10 is installed at the air inlet of the third-stage ammonium sulfate section 201 to detect the pressure at the air inlet of the third-stage ammonium sulfate section 201. The third pressure gauge 11 is installed at the air inlet of the fourth-stage ammonium sulfate section 202 to detect the pressure at the air inlet of the fourth-stage ammonium sulfate section 202. The above PDIAS1623001 can be calculated based on the corresponding pressures detected by the first pressure gauge 9, the second pressure gauge 10, and the third pressure gauge 11.

[0050] In some embodiments, the bypass valve 6, the first shut-off valve 7, and the second shut-off valve 8 are all equipped with handwheels, which are used to manually adjust the opening degree of the bypass valve 6, the first shut-off valve 7, and the second shut-off valve 8, respectively. Specifically, the opening degree of the bypass valve 6, the first shut-off valve 7, and the second shut-off valve 8 can be adjusted on-site by adjusting the handwheels of the corresponding valves.

[0051] The vent gas control system also includes a control room (not shown in the figure), which contains a controller. Valve assemblies and pressure gauge assemblies are connected to the controller. XV1623001, XV1623002, and PV1623002 also have remote operation capabilities, meaning that during normal operation, the corresponding valves can be opened and closed via the controller. This vent gas control system employs three measures: differential pressure interlock, remote control, and on-site operation. In emergencies, the central control unit can remotely operate the system to ensure stable operation.

[0052] In some embodiments, the second branch pipeline has four sub-pipes, which are respectively connected to the air inlets of the third-stage ammonium sulfate section 201, the fourth-stage ammonium sulfate section 202, the third-stage desulfurization section 203, and the fourth-stage desulfurization section 204. Each of the four branch pipelines is equipped with a switch valve. The switch valves can be opened and closed as needed. The four switch valves can be opened or closed simultaneously. Alternatively, two switch valves corresponding to the air inlets of the third-stage ammonium sulfate section 201 and the fourth-stage ammonium sulfate section 202 can be opened, while two switch valves connected to the air inlets of the third-stage desulfurization section 203 and the fourth-stage desulfurization section 204 can be closed. Or, two switch valves corresponding to the air inlets of the third-stage ammonium sulfate section 201 and the fourth-stage ammonium sulfate section 202 can be closed, while two switch valves connected to the air inlets of the third-stage desulfurization section 203 and the fourth-stage desulfurization section 204 can be opened. The released gas can be supplied separately to the inlet coke oven gas pipelines of the Phase III and Phase IV ammonium sulfate sections, separately to the inlet coke oven gas pipelines of Phase III desulfurization section 203 and Phase IV desulfurization section 204, or simultaneously to the inlet coke oven gas pipelines of Phase III ammonium sulfate section 201, Phase IV ammonium sulfate section 202, and Phase III desulfurization section 203 and Phase IV desulfurization section 204. The specific configuration can be determined based on actual production needs.

[0053] In some embodiments, the vent gas treatment system further includes a flow meter 12, which is disposed on the delivery pipeline 4 and is used to detect the flow rate of the vent gas in the delivery pipeline 4.

[0054] The embodiments of this application are simple, flexible and convenient, and can achieve diversified operations. When the chemical product recovery device is abnormal, it can be released to the ground flare. When the effective gas content of the purge gas is high, it can be released to the third and fourth phase ammonium sulfate and desulfurization stations. This system completely realizes zero pollution of waste gas utilization, improves the level of in-depth environmental protection treatment, eliminates environmental risks, reduces environmental pollution, and has good social and economic value.

[0055] The foregoing has described in detail several embodiments of the present utility model, but the present utility model is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications based on the concept of the present utility model, and these variations and modifications should all fall within the scope of protection claimed by the present utility model.

Claims

1. A flare gas management system, characterized in that, It includes a purge gas recovery device, a combustible component reuse device, a ground combustion device, and a delivery pipeline; The purge gas recovery device is used for centralized recovery of purge gas. The purge gas recovery device is connected to the inlet end of the conveying pipeline to transport the recovered purge gas into the conveying pipeline. The outlet end of the conveying pipeline is connected to the combustible component reuse device and the ground combustion device respectively to transport the purge gas in the conveying pipeline to the combustible component reuse device for reuse or to the ground combustion device for combustion. The combustible component recycling device includes a third-phase ammonium sulfate section, a fourth-phase ammonium sulfate section, a third-phase desulfurization section, and a fourth-phase desulfurization section; the vented gas in the conveying pipeline is transported to the third-phase ammonium sulfate section, the fourth-phase ammonium sulfate section, the third-phase desulfurization section, and the fourth-phase desulfurization section, or... The vented gas in the pipeline is transported to the Phase III ammonium sulfate section and the Phase IV ammonium sulfate section, or to the Phase III desulfurization section and the Phase IV desulfurization section.

2. The vent gas treatment system according to claim 1, characterized in that, The purge gas recovery device includes an ice machine purge gas recovery mechanism, a synthesis flash evaporation tank purge gas recovery mechanism, and a synthesis ammonia recovery mechanism. The ice machine purge gas recovery mechanism and the synthesis flash evaporation tank purge gas recovery mechanism are respectively connected to the synthesis ammonia recovery mechanism through intermediate pipes. The outlet of the synthesis ammonia recovery mechanism is connected to the inlet end of the conveying pipe. A bypass pipe is provided between the intermediate pipe and the conveying pipe.

3. The vent gas treatment system according to claim 2, characterized in that, The vent gas treatment system also includes a valve assembly, which includes a bypass valve, a first shut-off valve, and a second shut-off valve. The bypass valve is installed on the bypass pipeline; The delivery pipeline has a first branch pipeline and a second branch pipeline. The first branch pipeline is connected to the ground combustion device and is equipped with a first shut-off valve. The second branch pipeline is connected to the combustible component recycling device and is equipped with a second shut-off valve. The first shut-off valve and the second shut-off valve are interlocked by differential pressure.

4. The vent gas treatment system according to claim 3, characterized in that, The vent gas treatment system also includes an alarm that triggers when the pressure difference between the first branch pipe and the second branch pipe exceeds a first set threshold. When the pressure difference between the first branch pipe and the second branch pipe is greater than a second set threshold, the second shut-off valve closes and the first shut-off valve opens, wherein the second set threshold is greater than the first set threshold.

5. The vent gas treatment system according to claim 4, characterized in that, The vent gas treatment system also includes a pressure gauge assembly, which includes a first pressure gauge, a second pressure gauge, and a third pressure gauge. The first pressure gauge is installed on the conveying pipeline, the second pressure gauge is installed at the air inlet of the third-stage ammonium sulfate section, and the third pressure gauge is installed at the air inlet of the fourth-stage ammonium sulfate section.

6. The vent gas treatment system according to claim 5, characterized in that, The bypass valve, the first shut-off valve, and the second shut-off valve are all equipped with handwheels, which are used to manually adjust the opening degree of the bypass valve, the first shut-off valve, and the second shut-off valve, respectively.

7. The vent gas treatment system according to claim 6, characterized in that, The vent gas treatment system also includes a control room, which has a controller, and the valve assembly and the pressure gauge assembly are respectively connected to the controller.

8. The vent gas treatment system according to claim 4, characterized in that, The second branch pipeline has four sub-pipes, which are respectively connected to the air inlet of the third-phase ammonium sulfate section, the air inlet of the fourth-phase ammonium sulfate section, the air inlet of the third-phase desulfurization section, and the air inlet of the fourth-phase desulfurization section, and each of the four branch pipelines is equipped with a switch valve.

9. The vent gas treatment system according to claim 1, characterized in that, The vent gas treatment system also includes a flow meter, which is installed on the delivery pipeline to detect the flow rate of the vent gas in the delivery pipeline.

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