A CO content adjusting structure for a synthesis ammonia shift device
Patent Information
- Application Number
- CN202522511918.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-26
AI Technical Summary
本实用新型在原有的低变炉的原料气管道上连通设置了淬水管道和调节管路，当需要降低合成气中CO的含量时，可以通过淬水管道向低变炉中增加淬水进而降低合成气中CO的含量，其原理为，一方面合成氨变换装置中的变换反应（CO + H2O → CO2 + H2）为强放热反应，淬水可快速移除反应热，防止局部过热导致催化剂失活或副反应增加，从而维持催化剂对CO的高效转化能力，另一方面，淬水可以补充反应所需水蒸气，促进水煤气变换反应的进行，进一步降低CO含量至目标值。当需要提高合成气中CO的含量时，将原料气管道中的原料气直接输送至的低变炉出口侧的产品气管路中，进而使部分的CO不参与变换反应，直接送入下一工段，从而达到提高合成气中CO含量的目的；本实用新型通过上述两种方式，大幅提高了合成气中CO含量的调控范围，也能够实现合成气中CO含量的快速精准调控，提高了生产效率和产品质量。
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Figure CN224832596U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical production technology, specifically relating to a CO content adjustment structure for a synthetic ammonia conversion unit. Background Technology
[0002] In chemical production processes, shift converters are key equipment for adjusting the CO content in syngas. Their purpose is to generate hydrogen and carbon dioxide through a shift reaction between CO and water vapor, thus meeting the composition requirements of subsequent production processes. However, existing shift converters often face challenges in controlling the outlet CO content due to the reliance on traditional, limited control methods. These methods are ill-suited to complex and variable operating conditions, such as fluctuations in feed gas composition and load variations. Consequently, the outlet CO content is difficult to stabilize within the target range, leading to difficulties in adjusting subsequent processes and impacting production efficiency and product quality. Utility Model Content
[0003] This invention provides a CO content adjustment structure for a synthetic ammonia conversion device to address the above-mentioned problems.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: A CO content regulation structure for a synthetic ammonia conversion unit includes a low-pressure conversion furnace and a regulating pipeline. One end of the regulating pipeline is connected to the raw material gas pipeline at the inlet side of the low-pressure conversion furnace, and the other end of the regulating pipeline is connected to the product gas pipeline at the outlet side of the low-pressure conversion furnace. A pneumatic regulating valve is installed on the regulating pipeline.
[0005] Furthermore, it also includes a controller, which is electrically connected to the first pneumatic regulating valve. The controller is also electrically connected to a CO detection sensor, which is installed at the inlet of the liquid nitrogen washing device to monitor the CO content of the inlet gas of the liquid nitrogen washing device in real time.
[0006] Furthermore, the raw material gas pipeline on the inlet side of the low-temperature variable furnace is also connected to the quenching water pipeline. The other end of the quenching water pipeline is connected to the outlet of the quenching water tank. The inlet of the quenching water tank is connected to the outlet of the boiler. A second pneumatic regulating valve is installed on the quenching water pipeline. The second pneumatic regulating valve is electrically connected to the controller.
[0007] Furthermore, two manual shut-off valves are installed on the regulating pipeline, with the two manual shut-off valves located on either side of the first pneumatic regulating valve.
[0008] Compared with the prior art, the present invention has the following advantages: This invention connects a quenching water pipe and a regulating pipe to the original raw gas pipeline of the low-temperature shift converter. When it is necessary to reduce the CO content in the syngas, quenching water can be added to the low-temperature shift converter through the quenching water pipe to reduce the CO content in the syngas. The principle is as follows: on the one hand, the conversion reaction (CO + H2O → CO2 + H2) in the ammonia conversion unit is a strongly exothermic reaction. The quenching water can quickly remove the heat of reaction, prevent local overheating that could lead to catalyst deactivation or an increase in side reactions, thereby maintaining the catalyst's efficient conversion capacity for CO. On the other hand, the quenching water can replenish the water vapor required for the reaction, promote the water-gas conversion reaction, and further reduce the CO content to the target value. When it is necessary to increase the CO content in the syngas, the raw gas in the raw gas pipeline is directly transported to the product gas pipeline on the outlet side of the low-pressure shift furnace, so that some of the CO does not participate in the shift reaction and is directly sent to the next stage, thereby achieving the purpose of increasing the CO content in the syngas. Through the above two methods, this utility model significantly improves the control range of CO content in syngas and can also achieve rapid and precise control of CO content in syngas, thereby improving production efficiency and product quality.
[0009] This invention incorporates a CO detection sensor to detect the CO content in the syngas and provides real-time feedback to the controller. The controller compares the received signal with a set threshold, thereby controlling the operation of pneumatic regulating valves one and two, achieving automatic regulation of the CO content in the syngas. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram, 1 is a low-temperature variable furnace, 2 is a regulating pipeline, 3 is a raw material gas pipeline, 4 is a product gas pipeline, 5 is a first pneumatic regulating valve, 6 is a controller, 7 is a CO detection sensor, 8 is a liquid nitrogen washing device, 9 is a quenching water pipeline, 10 is a quenching water tank, 11 is a boiler, 12 is a second pneumatic regulating valve, 13 is a manual shut-off valve, 14 is a cooling device, and 15 is a low-temperature methanol washing device. Detailed Implementation
[0011] To further illustrate the technical solution of this utility model, the following embodiments will be used to further explain this utility model.
[0012] like Figure 1As shown, a CO content regulation structure for a synthetic ammonia shift unit includes a low-pressure shift furnace 1, a regulating pipeline 2, and a controller 6. One end of the regulating pipeline 2 is connected to the raw material gas pipeline 3 at the inlet side of the low-pressure shift furnace 1, and the other end of the regulating pipeline 2 is connected to the product gas pipeline 4 at the outlet side of the low-pressure shift furnace 1. A first pneumatic regulating valve 5 is installed on the regulating pipeline 2, and two manual shut-off valves 13 are also installed on the regulating pipeline 2, located on both sides of the first pneumatic regulating valve 5. The detection sensor 7 is installed at the inlet of the liquid nitrogen washing device 8 to monitor the CO content of the inlet gas of the liquid nitrogen washing device 8 in real time. The raw material gas pipeline 3 on the inlet side of the low-temperature furnace 1 is also connected to the quenching water pipeline 9. The other end of the quenching water pipeline 9 is connected to the outlet of the quenching water tank 10. The inlet of the quenching water tank 10 is connected to the outlet of the boiler 11. A second pneumatic regulating valve 12 is installed on the quenching water pipeline 9. The controller 6 is electrically connected to the first pneumatic regulating valve 5, the CO detection sensor 7 and the second pneumatic regulating valve 12.
[0013] The foregoing has shown and described the main features and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.
[0014] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A CO content adjustment structure for an ammonia synthesis conversion unit, characterized in that: It includes a low-temperature variable furnace (1) and a regulating pipeline (2). One end of the regulating pipeline (2) is connected to the raw material gas pipeline (3) on the inlet side of the low-temperature variable furnace (1), and the other end of the regulating pipeline (2) is connected to the product gas pipeline (4) on the outlet side of the low-temperature variable furnace (1). A pneumatic regulating valve (5) is installed on the regulating pipeline (2).
2. The CO content adjustment structure for a synthetic ammonia conversion unit according to claim 1, characterized in that: It also includes a controller (6), which is electrically connected to a pneumatic regulating valve (5). The controller (6) is also electrically connected to a CO detection sensor (7), which is installed at the inlet of the liquid nitrogen washing device (8) to monitor the CO content of the inlet gas of the liquid nitrogen washing device (8) in real time.
3. The CO content adjustment structure for a synthetic ammonia conversion unit according to claim 2, characterized in that: The raw material gas pipeline (3) on the inlet side of the low-temperature furnace (1) is also connected to the quenching water pipeline (9). The other end of the quenching water pipeline (9) is connected to the outlet of the quenching water tank (10). The inlet of the quenching water tank (10) is connected to the outlet of the boiler (11). A second pneumatic regulating valve (12) is installed on the quenching water pipeline (9). The second pneumatic regulating valve (12) is electrically connected to the controller (6).
4. The CO content adjustment structure for a synthetic ammonia conversion unit according to claim 1, characterized in that: Two manual shut-off valves (13) are also installed on the regulating pipeline (2), and the two manual shut-off valves (13) are located on both sides of the first pneumatic regulating valve (5).