Device for automatically controlling temperature of carbon dioxide gas
By adding bypass pipelines and automatic regulating valves to the flash evaporation system of the low-temperature methanol washing device, the carbon dioxide gas temperature is automatically controlled, and the problems of excessive cooling of the heat exchanger and leakage of circulating water are solved, achieving stable operation of the system and reducing energy consumption.
Patent Information
- Application Number
- CN202420272078.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-02-04
AI Technical Summary
In the flash evaporation system of the existing low-temperature methanol washing device, the temperature of carbon dioxide gas is difficult to effectively control, resulting in excessive cooling of the heat exchanger, frosting the pipeline and leaking in the circulating water, affecting the normal operation of the system and increasing energy consumption.
Design a device that automatically controls the temperature of carbon dioxide gas. By adding bypass pipelines and automatic regulating valves at the inlet and outlet of the circulating water heat exchanger of the hot flash vapor condenser, and a remote thermometer is installed at the outlet of the carbon dioxide product gas reheater to achieve reasonable control of the heat exchange effect and save circulating water consumption.
Effectively isolate the heat exchanger for maintenance to avoid cooling capacity loss, ensure the temperature of urea carbon dioxide gas, reduce system energy consumption, and avoid system parking.
Smart Images
Figure CN222550143U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flash evaporation systems of low-temperature methanol washing devices, in particular to a device for automatically controlling the temperature of carbon dioxide gas. Background Art
[0002] The carbon dioxide gas flashed out of the flash evaporation system of the low-temperature methanol washing device has a gas temperature of -50°C. After heat exchange, the gas is sent to the urea device to produce urea. In the existing technical solution, the heat exchange of the gas is that the hot flash gas of the heat regeneration tower is heat exchanged with the low-temperature carbon dioxide gas flashed by the flash evaporation system after heat exchange with the process circulating water. Due to the change in system load, the carbon dioxide gas flashed by the existing system has increased from the original design value of 15600Nm3 / h to 19300Nm3 / h, with a change rate of 23.7%. Due to excessive cold capacity, the temperature of the hot flash gas pipeline of the heat exchanger is as low as -3°C, and the outlet pipeline is frosted. In addition, the circulating water heat exchanger is prone to internal leakage due to the quality of the circulating water. The heat exchanger has accumulated 4 internal leakages, causing the system to stop and affect the normal operation of the system. The low-temperature methanol washing gas purification technology, the system's cold and heat exchange utilization is more, if a heat exchanger failure or poor heat exchange efficiency occurs in the system, it will affect the thermal balance of the entire system. The loss of cold capacity will lead to an increase in system energy consumption or excessive use of circulating water.
[0003] To this end, we propose a device for automatically controlling the temperature of carbon dioxide gas. Utility Model Content
[0004] The purpose of the utility model is to provide a device for automatically controlling the temperature of carbon dioxide gas to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for automatically controlling the temperature of carbon dioxide gas, comprising a thermal regeneration tower and a bypass pipeline, the top of the thermal regeneration tower is connected to a hot flash steam condenser circulating water heat exchanger through a conduit, one end of the hot flash steam condenser circulating water heat exchanger is connected to a carbon dioxide product gas recuperator through a conduit, methanol liquid is flash evaporated under reduced pressure in the hot flash evaporation section at the top of the thermal regeneration tower, the hot flash steam passes through the hot flash steam condenser circulating water heat exchanger and the carbon dioxide product gas recuperator in sequence, and enters the hydrogen sulfide concentration tower, a bypass pipeline is added to the inlet and outlet conduits of the hot flash steam condenser circulating water heat exchanger, and a remote thermometer is arranged at the outlet of the carbon dioxide product gas recuperator.
[0006] Preferably, the bypass pipeline is provided with an automatic regulating valve, and the automatic regulating valve is electrically connected to the remote thermometer.
[0007] Preferably, a lean methanol delivery pump is provided on one side of the thermal regeneration tower.
[0008] Preferably, the output end of the lean methanol delivery pump is connected to a flash tank via a conduit, and the flash tank evaporates a large amount of carbon dioxide.
[0009] Preferably, the automatic regulating valve is electromechanically connected to the equipment body.
[0010] Preferably, valves are installed at the inlet and outlet conduits of the circulating water heat exchanger of the hot flash steam condenser.
[0011] Compared with the prior art, the beneficial effects of the utility model are:
[0012] When the utility model is in use, gate valves are added to the inlet and outlet pipelines of the circulating water heat exchanger of the hot flash steam condenser and a bypass pipeline is added. When the circulating water quality is poor and there is an internal leakage in the circulating water heat exchanger of the hot flash steam condenser, the hot flash steam can pass through the bypass pipeline to isolate the heat exchanger for maintenance. A remote thermometer and an automatic bypass regulating valve of the circulating water heat exchanger of the hot flash steam condenser are added to the outlet of the carbon dioxide product gas recuperator, so that the heat exchange effect of the circulating water heat exchanger of the hot flash steam condenser can be reasonably controlled, the circulating water consumption is saved, and at the same time the temperature of the carbon dioxide gas sent to urea is guaranteed, thereby avoiding the loss of cooling capacity of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0014] In the figure: 1. Thermal regeneration tower; 2. Thermal flash steam condenser circulating water heat exchanger; 3. Carbon dioxide product gas reheater; 4. Bypass pipeline; 5. Remote thermometer; 6. Automatic regulating valve; 7. Lean methanol delivery pump; 8. Flash tank. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] See also Figure 1As shown, a device for automatically controlling the temperature of carbon dioxide gas comprises a heat regeneration tower 1 and a bypass pipeline 4. The top of the heat regeneration tower 1 is connected to a hot flash steam condenser circulating water heat exchanger 2 through a conduit. One end of the hot flash steam condenser circulating water heat exchanger 2 is connected to a carbon dioxide product gas recuperator 3 through a conduit. Methanol liquid is flash evaporated under reduced pressure in the hot flash evaporation section at the top of the heat regeneration tower 1. The hot flash steam passes through the hot flash steam condenser circulating water heat exchanger 2 and the carbon dioxide product gas recuperator 3 in sequence and enters the hydrogen sulfide concentration tower. The hot flash steam condenser circulating water heat exchanger 2 is connected to the carbon dioxide product gas recuperator 3. A bypass pipeline 4 is added to the inlet and outlet conduits of the water heat exchanger 2, a remote thermometer 5 is set at the outlet of the carbon dioxide product gas reheater 3, and an automatic regulating valve 6 is set on the bypass pipeline 4. The automatic regulating valve 6 is electrically connected to the remote thermometer 5. A lean methanol delivery pump 7 is provided on one side of the thermal regeneration tower 1. The output end of the lean methanol delivery pump 7 is connected to a flash tank 8 through a conduit. The flash tank 8 evaporates a large amount of carbon dioxide. The automatic regulating valve 6 is electromechanically connected to the main body of the equipment, and valves are installed at the inlet and outlet conduits of the thermal flash gas condenser circulating water heat exchanger 2.
[0017] Working principle:
[0018] When the utility model is in use, by adding gate valves and bypass pipelines 4 to the inlet and outlet pipelines of the hot flash steam condenser circulating water heat exchanger 2, when the circulating water quality is poor and there is an internal leakage in the hot flash steam condenser circulating water heat exchanger 2, the hot flash steam can pass through the bypass pipeline 4, and the heat exchanger is isolated for maintenance, and a remote thermometer 5 is added to the outlet of the carbon dioxide product gas reheater 3 and a two-way automatic regulating valve 6 by the hot flash steam condenser circulating water heat exchanger is added to achieve reasonable control of the heat exchange effect of the hot flash steam condenser circulating water heat exchanger 2, save the amount of circulating water, and at the same time ensure the temperature of the carbon dioxide gas sent to urea, avoiding the loss of system cooling capacity.
[0019] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A device for automatically controlling the temperature of carbon dioxide gas, characterized in that: include: A thermal regeneration tower (1), wherein the top of the thermal regeneration tower (1) is connected to a hot flash steam condenser circulating water heat exchanger (2) via a conduit, and one end of the hot flash steam condenser circulating water heat exchanger (2) is connected to a carbon dioxide product gas reheater (3) via a conduit, and methanol liquid is flash evaporated under reduced pressure in the hot flash evaporation section at the top of the thermal regeneration tower (1), and the hot flash steam passes through the hot flash steam condenser circulating water heat exchanger (2) and the carbon dioxide product gas reheater (3) in sequence and enters the hydrogen sulfide concentration tower; A bypass line (4) is added to the inlet and outlet ducts of the hot flash steam condenser circulating water heat exchanger (2), and a remote thermometer (5) is provided at the outlet of the carbon dioxide product gas reheater (3).
2. The device for automatically controlling the temperature of carbon dioxide gas according to claim 1, characterized in that: The bypass pipeline (4) is provided with an automatic regulating valve (6), and the automatic regulating valve (6) is electrically connected to the remote thermometer (5).
3. The device for automatically controlling the temperature of carbon dioxide gas according to claim 1, characterized in that: A lean methanol delivery pump (7) is provided on one side of the thermal regeneration tower (1).
4. The device for automatically controlling the temperature of carbon dioxide gas according to claim 3, characterized in that: The output end of the lean methanol delivery pump (7) is connected to a flash tank (8) via a conduit, and the flash tank (8) evaporates a large amount of carbon dioxide.
5. The device for automatically controlling the temperature of carbon dioxide gas according to claim 2, characterized in that: The automatic regulating valve (6) is electromechanically connected to the equipment body.
6. The device for automatically controlling the temperature of carbon dioxide gas according to claim 1, characterized in that: Valves are installed at the inlet and outlet conduits of the hot flash steam condenser circulating water heat exchanger (2).