Feed gas treatment system
By introducing methanol spraying devices and high-temperature inert gas heating equipment into the raw gas treatment system, the problem of freezing and blocking of raw gas/exhaust heat exchangers is solved, and the stable circulation of raw gas and equipment protection is achieved.
Patent Information
- Application Number
- CN202421619212.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-09
AI Technical Summary
In the prior art, the raw material gas/exhaust heat exchanger of the raw material gas treatment system has the problem of freezing and blockage, resulting in damage to the equipment.
A raw material gas treatment system is designed, including heat exchange equipment, pretreatment equipment and heating equipment. The pretreatment equipment reduces the freezing point of saturated water in the raw material gas through a methanol spray device, while the heating equipment increases the temperature of the raw material gas through high-temperature inert gas to avoid icing and blockage.
It effectively reduces the freezing point of saturated water in raw gas, prevents the freezing of raw gas from blocking the pipeline, protects the equipment, and improves the reliability and efficiency of the system.
Smart Images
Figure CN222964486U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchanger antifreeze, and particularly to a raw material gas treatment system. Background Technique
[0002] In the existing acidic raw material gas treatment system, through the raw material gas / tail gas heat exchanger, the raw material gas and the low-temperature tail gas (-15°C) perform countercurrent heat exchange. At this time, the outlet temperature of the raw material gas is 10°C. However, during the process of shutting down the device, the tail gas in the system is still in the flashing state, and the flashing amount decreases little, that is, in the state where the raw material gas gradually exits and the input amount of the tail gas remains almost unchanged. During this process, the temperature of the raw material gas can be reduced to -25°C at the lowest, thereby causing the saturated water in the raw material gas to freeze at low temperature and block the raw material gas / tail gas heat exchanger, resulting in equipment damage.
[0003] That is to say, there is a problem of freezing and blocking in the raw material gas / tail gas heat exchanger of the raw material gas treatment system in the prior art. Content of the Utility Model
[0004] The main purpose of the utility model is to provide a raw material gas treatment system to solve the problem of freezing and blocking in the raw material gas / tail gas heat exchanger of the raw material gas treatment system in the prior art.
[0005] To achieve the above purpose, the utility model provides a raw material gas treatment system, including a heat exchange device, a pretreatment device and a heat supply device. The heat exchange device has a raw material gas inlet and a low-temperature tail gas inlet. The raw material gas inlet is used to connect to the raw material gas input end, and the low-temperature tail gas inlet is used to introduce low-temperature tail gas. The heat exchange device is used to exchange heat between the raw material gas and the low-temperature tail gas to reduce the temperature of the raw material gas; a pretreatment device, the pretreatment device is connected between the raw material gas input end and the raw material gas inlet, and the pretreatment device is used to reduce the freezing point of the saturated water in the raw material gas; a heat supply device, the heat supply device is connected between the raw material gas input end and the raw material gas inlet, and the heat supply device can output high-temperature inert gas. The high-temperature inert gas is mixed with the raw material gas to increase the temperature of the raw material gas.
[0006] Furthermore, the pretreatment device includes a methanol spraying device. The methanol spraying device is connected between the raw material gas input end and the raw material gas inlet, so that the raw material gas from the raw material gas input end is mixed with methanol to form a mixture, and the mixture enters the heat exchange device.
[0007] Furthermore, the raw material gas treatment system further includes a separation device. The heat exchange device also has a raw material gas outlet. The separation device is connected to the raw material gas outlet, and the separation device can separate the mixture into raw material gas and acid water, and the acid water contains methanol.
[0008] Further, the raw material gas treatment system further includes a methanol recovery device. The methanol recovery device is connected to the separation device so that the acid water enters the methanol recovery device, and the methanol recovery device can extract methanol.
[0009] Further, the methanol recovery device includes a tail gas scrubbing tower. The tail gas scrubbing tower is connected to the separation device. The raw material gas treatment system further includes an acid water regulating valve, and the acid water regulating valve is connected between the tail gas scrubbing tower and the separation device.
[0010] Further, the temperature of the mixture is greater than the freezing point of the mixture.
[0011] Further, the heating device includes a nitrogen heat exchanger. The nitrogen heat exchanger has a high-pressure nitrogen inlet and a high-temperature nitrogen outlet. The high-temperature nitrogen outlet is connected to the raw material gas inlet. The nitrogen heat exchanger is used to exchange heat between high-pressure nitrogen and low-pressure steam to obtain high-temperature nitrogen.
[0012] Further, the temperature of the high-temperature nitrogen is greater than or equal to 65°C.
[0013] Further, the heating device and the pretreatment device are misaligned and connected to the raw material gas input end and the raw material gas inlet. The heating device is closer to the raw material gas input end than the pretreatment device.
[0014] Further, the raw material gas treatment system further includes a raw material gas boundary valve, and the raw material gas boundary valve is arranged between the raw material gas input end and the heating device.
[0015] Applying the technical solution of the present invention, the raw material gas treatment system includes a heat exchange device, a pretreatment device and a heating device. The heat exchange device has a raw material gas inlet and a low-temperature tail gas inlet. The raw material gas inlet is used to connect to the raw material gas input end, and the low-temperature tail gas inlet is used to introduce low-temperature tail gas. The heat exchange device is used to exchange heat between the raw material gas and the low-temperature tail gas to reduce the temperature of the raw material gas; a pretreatment device, the pretreatment device is connected between the raw material gas input end and the raw material gas inlet, and the pretreatment device is used to lower the freezing point of the saturated water in the raw material gas; a heating device, the heating device is connected between the raw material gas input end and the raw material gas inlet, and the heating device can output high-temperature inert gas. The high-temperature inert gas is mixed with the raw material gas to increase the temperature of the raw material gas.
[0016] The present application provides a raw gas treatment system. The heat exchange device is used to receive the raw gas and the low-temperature tail gas. The raw gas input end is connected to the raw gas inlet, serving as the inlet channel for the raw gas, and the low-temperature tail gas inlet serves as the inlet channel for the low-temperature tail gas. After passing through the heat exchange device, the raw gas and the low-temperature tail gas exchange heat, and the temperature of the raw gas decreases. The heat exchange device effectively reduces the demand for external energy by utilizing the internal heat energy, greatly improving the energy utilization rate. A pretreatment device is arranged between the raw gas input end and the raw gas inlet, effectively reducing the freezing point of the saturated water in the raw gas, making it not easy for the raw gas to freeze. At the same time, a heating device is also arranged between the raw gas input end and the raw gas inlet. The output end of the heating device is high-temperature inert gas, which is mixed into the raw gas to increase the temperature of the raw gas, avoiding the raw gas from freezing and blocking the pipeline, resulting in equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The schematic diagrams in the specification forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:
[0018] Figure 1 The structural schematic diagram according to an optional embodiment of the present utility model is shown.
[0019] Among them, the above-mentioned drawings include the following reference numerals:
[0020] 10. Heat exchange device; 11. Raw gas input end; 12. Raw gas inlet; 13. Low-temperature tail gas inlet; 14. Raw gas outlet; 15. Raw gas boundary valve; 16. Tail gas outlet; 20. Pretreatment device; 21. Methanol spraying device; 30. Heating device; 31. Nitrogen heat exchanger; 32. Low-pressure steam; 33. Low-pressure steam condensate; 34. High-pressure hot nitrogen regulating valve; 35. High-pressure nitrogen inlet; 36. High-temperature nitrogen outlet; 40. Separation device; 41. Raw gas absorption outlet; 42. Acid water regulating valve; 43. Acid water pipeline; 50. Methanol recovery device; 51. Tail gas scrubbing tower; 52. Methanol-water outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.
[0022] It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.
[0023] In the present utility model, unless otherwise specified, the orientation terms such as "upper, lower, top, bottom" generally refer to the directions shown in the drawings or to the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation terms are not used to limit the present utility model.
[0024] In order to solve the problem of ice freezing and blockage of the raw material gas / tail gas heat exchanger in the raw material gas treatment system in the prior art, the present utility model provides a raw material gas treatment system.
[0025] As Figure 1 shown, the raw material gas treatment system of the present application includes a heat exchange device 10, a pretreatment device 20 and a heating device 30. The heat exchange device 10 has a raw material gas inlet 12 and a low-temperature tail gas inlet 13. The raw material gas inlet 12 is used to connect to the raw material gas input end 11, and the low-temperature tail gas inlet 13 is used to introduce low-temperature tail gas. The heat exchange device 10 is used to exchange heat between the raw material gas and the low-temperature tail gas to reduce the temperature of the raw material gas; the pretreatment device 20 is connected between the raw material gas input end 11 and the raw material gas inlet 12, and the pretreatment device 20 is used to lower the freezing point of the saturated water in the raw material gas; the heating device 30 is connected between the raw material gas input end 11 and the raw material gas inlet 12, and the heating device 30 can output high-temperature inert gas, and the high-temperature inert gas is mixed with the raw material gas to increase the temperature of the raw material gas.
[0026] The present application proposes a raw material gas treatment system. The heat exchange device 10 is used to receive the raw material gas and the low-temperature tail gas. The raw material gas input end 11 is connected to the raw material gas inlet 12 as the inlet channel for the raw material gas, and the low-temperature tail gas inlet 13 is used as the inlet channel for the low-temperature tail gas. After passing through the heat exchange device 10, the raw material gas and the low-temperature tail gas exchange heat, and the temperature of the raw material gas decreases. The heat exchange device 10 effectively reduces the demand for external energy by using the internal heat energy, greatly improving the energy utilization rate. A pretreatment device 20 is provided between the raw material gas input end 11 and the raw material gas inlet 12, which effectively lowers the freezing point of the saturated water in the raw material gas, making the raw material gas not easy to freeze. At the same time, a heating device 30 is also provided between the raw material gas input end 11 and the raw material gas inlet 12. The output end of the heating device 30 is high-temperature inert gas, which is mixed into the raw material gas to increase the temperature of the raw material gas, avoiding the raw material gas from freezing and blocking the pipeline, resulting in damage to the equipment.
[0027] As Figure 1As shown in the figure, the pretreatment device 20 includes a methanol spraying device 21. The methanol spraying device 21 is connected to the raw material gas input end 11 and the raw material gas inlet 12, so that the raw material gas from the raw material gas input end 11 is mixed with methanol to form a mixture, and the mixture enters the heat exchange device 10. That is to say, the main device of the pretreatment device 20 is the methanol spraying device 21, which is located between the raw material gas input end 11 and the raw material gas inlet 12. The methanol spraying device 21 can output methanol. After the methanol is mixed into the raw material gas, the ability of methanol molecules to interfere with the formation of ice crystals by water molecules is reduced, and the freezing point of water is lowered, thereby reducing the freezing point of saturated water in the raw material gas. At the same time, the methanol spraying device 21 mixes the sprayed methanol with the raw material gas, ensuring sufficient contact between methanol and the raw material gas, which is beneficial to efficiently absorb the acidic components in the raw material gas. The mixture then enters the heat exchange device 10 to carry out heat exchange between the raw material gas and the low-temperature tail gas, effectively improving the energy utilization rate. Finally, the heat-exchanged tail gas is output from the tail gas outlet 16 of the heat exchange device 10. As Figure 1 As shown in the figure, the raw material gas treatment system further includes a separation device 40. The heat exchange device 10 also has a raw material gas outlet 14. The separation device 40 is connected to the raw material gas outlet 14. The separation device 40 can separate the mixture into raw material gas and acid water, and the acid water contains methanol. That is to say, after the mixture is heated by the heat exchange device 10, the mixture enters the separation device 40 through the raw material gas outlet 14. The separation device 40 extracts the raw material gas, and the condensed acid water flows into the backend system. Correspondingly, the separated raw material gas is output through the raw material gas absorption outlet 41. This device effectively removes the moisture and other impurities in the raw material gas and improves the purity of the raw material gas. At the same time, the effective separation effect of the separation device 40 on the raw material gas and the methanol-containing acid water greatly improves the resource utilization efficiency, which can not only reduce production costs but also protect the environment.
[0028] As Figure 1 As shown in the figure, the raw material gas treatment system further includes a methanol recovery device 50. The methanol recovery device 50 is connected to the separation device 40, so that the acid water enters the methanol recovery device 50, and the methanol recovery device 50 can extract methanol. That is to say, the separation device 40 has an acid water outlet, and the acid water can enter the methanol recovery device 50. During the shutdown process of the raw material gas treatment system, methanol is sent to the methanol recovery device 50 along with the acid water. After the methanol is recovered, it can not only protect the environment but also be recycled to reduce resource waste.
[0029] As Figure 1As shown, the methanol recovery device 50 includes a tail gas scrubbing tower 51. The tail gas scrubbing tower 51 is connected to the separation device 40. The raw gas treatment system further includes an acid water regulating valve 42. The acid water regulating valve 42 is connected between the tail gas scrubbing tower 51 and the separation device 40. That is to say, the separation device 40 has an acid water outlet. The acid water flowing into the tail gas scrubbing tower 51 is regulated by the acid water regulating valve 42 and the acid water pipeline 43. By regulating the acid water regulating valve 42, the acid water can enter the methanol recovery device 50 along the acid water pipeline 43. During the shutdown process of the raw gas treatment system, methanol is sent to the tail gas scrubbing tower 51 along with the acid water, and the methanol is recovered through the methanol-water outlet 52, realizing the recovery and utilization of methanol resources.
[0030] As Figure 1 shown, the temperature of the mixture is higher than the freezing point of the mixture. The temperature of the mixture after being evenly distributed should be at least higher than the freezing point of the mixture to meet the requirement of continuous flow and avoid the formation of solid ice crystals that block the heat exchange equipment 10 and cause equipment damage.
[0031] As Figure 1 shown, the heating equipment 30 includes a nitrogen heat exchanger 31. The nitrogen heat exchanger 31 has a high-pressure nitrogen inlet 35 and a high-temperature nitrogen outlet 36. The high-temperature nitrogen outlet 36 is connected to the raw gas inlet 12. The nitrogen heat exchanger 31 is used to exchange heat between high-pressure nitrogen and low-pressure steam to obtain high-temperature nitrogen. That is to say, through the regulation of the high-pressure hot nitrogen regulating valve 34, high-pressure nitrogen enters the nitrogen heat exchanger 31 from the high-pressure nitrogen inlet 35, exchanges heat with the low-pressure steam 32 to be converted into high-temperature nitrogen, and obtains low-pressure steam condensate 33. At the same time, the high-pressure nitrogen releases heat to the raw gas, effectively increasing the temperature of the raw gas. As an inert gas heat exchange medium, nitrogen can effectively ensure the safety of operation.
[0032] As Figure 1 shown, the temperature of the high-temperature nitrogen is greater than or equal to 65 °C. That is to say, after the high-pressure nitrogen passes through the nitrogen heat exchanger 31, the temperature of the high-temperature nitrogen converted from the high-pressure nitrogen is controlled at 65 °C and above, fully ensuring that the temperature of the mixture can reach above the freezing point and reducing the risk of freezing and blocking of the heat exchange equipment 10.
[0033] As Figure 1 shown, the heating equipment 30 and the pretreatment equipment 20 are misaligned and connected to the raw gas input end 11 and the raw gas inlet 12. The heating equipment 30 is closer to the raw gas input end 11 than the pretreatment equipment 20. That is to say, the raw gas flows from the raw gas input end 11 to the raw gas inlet 12, first contacts the high-temperature nitrogen provided by the heating equipment 30, and then contacts the methanol provided by the pretreatment equipment 20. Using methanol as an antifreeze to lower the freezing point, and at the same time using high-temperature nitrogen to heat the raw gas, jointly ensuring the antifreeze effect under extremely low temperatures.
[0034] As Figure 1As shown in the figure, the raw gas treatment system further includes a raw gas boundary valve 15, which is arranged between the raw gas input end 11 and the heating device 30. That is to say, the raw gas boundary valve 15 is located between the raw gas input end 11 and the heating device 30, which can control the flow rate of the raw gas and make it flow in a specified direction, avoiding the backflow of high-temperature nitrogen and methanol towards the raw gas input end 11.
[0035] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
[0036] 1. The heat exchange device 10 effectively reduces the demand for external energy by using the internal heat energy, greatly improving the energy utilization rate.
[0037] 2. The pretreatment device 20 sprays the selected absorbent into the gas flow of the raw gas before the raw gas is cooled, increasing the contact area between methanol and the raw gas, absorbing the acidic components in the raw gas, effectively reducing the freezing point of the saturated water in the raw gas, and making the raw gas not easy to freeze.
[0038] 3. A heating device 30 is also arranged between the raw gas input end 11 and the raw gas inlet 12. The output end of the heating device 30 is high-temperature inert gas, which is mixed into the raw gas to increase the temperature of the raw gas, avoiding the raw gas from freezing and blocking the pipeline, resulting in equipment damage.
[0039] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0040] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0041] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0042] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A raw gas processing system, characterized in that: include: A heat exchange device (10), the heat exchange device (10) having a raw gas inlet (12) and a low-temperature tail gas inlet (13), the raw gas inlet (12) being used to connect to the raw gas input end (11), the low-temperature tail gas inlet (13) being used to introduce low-temperature tail gas, the heat exchange device (10) being used to exchange heat between the raw gas and the low-temperature tail gas to reduce the temperature of the raw gas; A pretreatment device (20), the pretreatment device (20) being connected between the raw gas input end (11) and the raw gas inlet (12), the pretreatment device (20) being used to reduce the freezing point of saturated water in the raw gas; A heating device (30), the heating device (30) is connected between the raw gas input end (11) and the raw gas inlet (12), and the heating device (30) can output high-temperature inert gas, and the high-temperature inert gas is mixed with the raw gas to increase the temperature of the raw gas.
2. The raw gas processing system according to claim 1, characterized in that: The pretreatment equipment (20) includes a methanol spray device (21), and the methanol spray device (21) is connected to the raw gas input end (11) and the raw gas inlet (12) so that the raw gas from the raw gas input end (11) is mixed with the methanol to form a mixed substance, and the mixed substance enters the heat exchange equipment (10).
3. The raw gas processing system according to claim 2, characterized in that: The raw gas processing system also includes a separation device (40), and the heat exchange equipment (10) also has a low-temperature tail gas inlet (13). The separation device (40) is connected to the low-temperature tail gas inlet (13), and the separation device (40) can separate the mixed substance into the raw gas and acid water, and the acid water contains the methanol.
4. The raw gas processing system according to claim 3, characterized in that: The raw gas processing system further comprises a methanol recovery device (50), wherein the methanol recovery device (50) is connected to the separation device (40) so that the acid water enters the methanol recovery device (50), and the methanol recovery device (50) can extract the methanol.
5. The raw gas processing system according to claim 4, characterized in that: The methanol recovery device (50) includes a tail gas washing tower (51), and the tail gas washing tower (51) is connected to the separation device (40). The raw gas treatment system also includes a sour water regulating valve (42), and the sour water regulating valve (42) is connected between the tail gas washing tower (51) and the separation device (40).
6. The raw gas processing system according to claim 2, characterized in that: The temperature of the mixed substance is greater than the freezing point of the mixed substance.
7. The raw gas processing system according to claim 1, characterized in that: The heat supply device (30) comprises a nitrogen heat exchanger (31), wherein the nitrogen heat exchanger (31) has a high-pressure nitrogen inlet (35) and a high-temperature nitrogen outlet (36), wherein the high-temperature nitrogen outlet (36) is connected to the raw gas inlet (12), and the nitrogen heat exchanger (31) is used to exchange heat between high-pressure nitrogen and low-pressure steam to obtain high-temperature nitrogen.
8. The raw gas processing system according to claim 7, characterized in that: The temperature of the high-temperature nitrogen is greater than or equal to 65°C.
9. The raw gas processing system according to any one of claims 1 to 8, characterized in that: The heat supply device (30) and the pretreatment device (20) are staggered to connect the raw gas input end (11) and the raw gas inlet (12), and the heat supply device (30) is closer to the raw gas input end (11) relative to the pretreatment device (20).
10. The raw gas processing system according to claim 9, characterized in that: The raw gas processing system further comprises a raw gas boundary valve (15), wherein the raw gas boundary valve (15) is arranged between the raw gas input end (11) and the heat supply device (30).