Temperature swing adsorption purification isobaric regeneration closed circulation system

Abstract

The utility model relates to the technical field of temperature swing adsorption purification, in particular to a temperature swing adsorption purification isobaric regeneration closed circulation system which comprises a booster fan, a heater, an adsorption tower, a cooler and a separator, an outlet of the booster fan is communicated with an inlet of the heater, an outlet of the heater is communicated with an inlet of the adsorption tower, an outlet of the adsorption tower is communicated with an inlet of the cooler, an outlet of the cooler is communicated with an inlet of the separator, an outlet of the separator is communicated with an inlet of the booster fan, and therefore a circulation pipeline is formed. The regeneration gas is obtained from purified gas, the booster fan is a volumetric fan, a first bypass is additionally arranged at the position of the booster fan, a valve with an adjustable opening degree is arranged on the first bypass, and openings in the two ends of the first bypass are communicated with an inlet and an outlet of the booster fan respectively. The temperature swing adsorption purification isobaric regeneration closed circulation system can solve the problem of heavy load starting of the booster fan, and enables the load of the heater to be adjustable.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature-swing adsorption purification, in particular to a temperature-swing adsorption purification isobaric regeneration closed circulation system. Background Art

[0002] Temperature swing adsorption purification is an operating method that uses the property that the equilibrium adsorption capacity of the adsorbent can decrease with the increase of temperature to perform normal temperature adsorption and temperature rise desorption. It is widely used in industrial processes such as gas drying, raw gas purification, removal or recovery of low-concentration solvents in waste gas, and treatment of waste gas and waste liquid. Temperature swing adsorption purification can be divided into two types: isobaric regeneration and decompression regeneration according to different regeneration processes, and the isobaric regeneration of temperature swing adsorption purification can be divided into two types of cycles: closed cycle and open cycle.

[0003] The entire cycle process of the isobaric regeneration closed cycle of temperature-swing adsorption purification is as follows: gas is taken from the purified gas as the circulating regeneration gas, and the regeneration gas is first pressurized by a booster fan and then enters the heater for heating; the heated high-temperature regeneration gas then enters the adsorption tower to analyze the heated bed layer in the adsorption tower and blow away the moisture from the bed layer; then, the regeneration gas saturated with water vapor is cooled by a cooler and then separated into gas and liquid in a separator, and the bed layer is heated in a cycle until the analysis is completed; after the analysis is completed, the heater is turned off, and the separated regeneration gas is pressurized by a booster fan and then enters the adsorption tower to cool the high-temperature bed layer, and the cooled adsorption tower waits to enter the next adsorption process, thereby cyclically circulating adsorption and analysis.

[0004] The above-mentioned isobaric regeneration closed cycle of temperature-variable adsorption purification has the following problems: (1) The adsorption and regeneration of the adsorption tower are not continuous, but after the regeneration is completed, it waits for a while before the next round of adsorption. This working condition causes the booster fan to start and stop all the time. When the booster fan is started under the working pressure, it is a heavy-load start, which will cause the motor on the booster fan to suddenly be subjected to a large load during the startup phase. Because the booster fan needs to be started and stopped frequently during the entire cycle, this causes the motor to be easily overloaded and heated, and even causes damage to the motor, affecting the service life of the booster fan; (2) In the entire circulation pipeline, the content of the regenerated gas and the temperature to be reached by the heated regenerated gas are fixed, which causes the load of the heater to be fixed and cannot be adjusted, resulting in a large energy waste when the amount of water to be desorbed by the heater is reduced, and the selection range of the heater itself is also narrow. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a temperature-swing adsorption purification isobaric regeneration closed circulation system which can solve the problem of overload start-up of the booster fan and make the load of the heater adjustable.

[0006] The utility model adopts the following technical solutions:

[0007] The utility model provides a temperature-variable adsorption purification isobaric regeneration closed circulation system, comprising a booster fan, a heater, an adsorption tower, a cooler and a separator, the outlet of the booster fan is connected with the inlet of the heater, the outlet of the heater is connected with the inlet of the adsorption tower, the outlet of the adsorption tower is connected with the inlet of the cooler, the outlet of the cooler is connected with the inlet of the separator, the outlet of the separator is connected with the inlet of the booster fan to form a circulation pipeline, and the circulation pipeline is passed with regeneration gas, the regeneration gas is obtained by taking gas from purified gas, the booster fan is a volumetric fan, a first bypass is added at the position of the booster fan, a valve with adjustable opening is arranged on the first bypass, and openings at both ends of the first bypass are respectively connected with the inlet and outlet of the booster fan.

[0008] Preferably, the valve is a manual valve, and a second bypass is added at the booster fan position. An automatic valve with adjustable opening and program control is set on the second bypass. The openings at both ends of the second bypass are respectively connected to the inlet and outlet of the booster fan. When the booster fan is controlled to start, the automatic valve opens automatically, and the booster fan is officially started after a delay of 15 seconds. After the booster fan is started, the program automatically closes the automatic valve.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The temperature-swing adsorption purification isobaric regeneration closed circulation system of the utility model adds a first bypass at the position of the booster fan, so that when the booster fan is started, by opening the valve on the first bypass, most of the regenerated gas in the circulation pipeline can flow through the first bypass, thereby reducing the starting load and impact of the booster fan, allowing the booster fan to start with a light load or even no load, thereby extending the service life of the booster fan.

[0011] In addition, when the booster fan adopts a positive displacement fan, under the high pressure environment of the circulation pipeline, the higher the pressure, the greater the mass and flow rate of the same volume of gas. Based on this, by changing the opening of the valve on the first bypass, the high-pressure gas at the outlet of the booster fan can be partially returned to the inlet of the booster fan through the first bypass, thereby reducing the pressure at the outlet of the booster fan. Because the entire circulation pipeline is closed, the booster fan serves as the power source of the entire cycle. Therefore, the pressure difference between the inlet and outlet of the booster fan is the driving force for the circulation of the regenerated gas. By adjusting the opening of the valve on the first bypass, the pressure difference between the inlet and outlet of the booster fan can be controlled, thereby affecting the flow rate of the regenerated gas in the circulation pipeline. When the inlet and outlet temperatures of the heater remain unchanged, the flow rate of the regenerated gas flowing through the heater per unit time changes, which causes the work done by the heater to change.

[0012] That is to say, the heat load of the heater can be adjusted by adjusting the opening of the valve on the first bypass. When the heat load of the heater is adjustable, not only can the entire circulation system adapt to the regeneration process under different loads and water contents, but also the selection range of the heater can be wider during the design and selection stage. More importantly, if the working conditions change, such as when the water intake decreases, the amount of adsorbed water and the amount of regenerated and desorbed water will both decrease. Opening the valve on the first bypass can reduce the flow rate of the regeneration gas and reduce the power of the heater, thereby achieving the purpose of saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a connection diagram of a temperature-swing adsorption purification isobaric regeneration closed circulation system in Example 1 of the utility model.

[0014] Figure 2 It is a connection diagram of a temperature-swing adsorption purification isobaric regeneration closed circulation system in the second embodiment of the present utility model.

[0015] The reference numerals are described as follows:

[0016] 1. Booster fan

[0017] 2. Heater

[0018] 3. Adsorption tower

[0019] 4. Cooler

[0020] 5. Separator

[0021] 6. First bypass

[0022] 7. Manual valve

[0023] 8. Second bypass

[0024] 9. Automatic valve DETAILED DESCRIPTION

[0025] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0029] Embodiment 1:

[0030] See also Figure 1 The present embodiment provides a temperature-swing adsorption purification isobaric regeneration closed circulation system, comprising a booster fan 1, a heater 2, an adsorption tower 3, a cooler 4 and a separator 5, the outlet of the booster fan 1 is connected to the inlet of the heater 2, the outlet of the heater 2 is connected to the inlet of the adsorption tower 3, the outlet of the adsorption tower 3 is connected to the inlet of the cooler 4, the outlet of the cooler 4 is connected to the inlet of the separator 5, and the outlet of the separator 5 is connected to the inlet of the booster fan 1 to form a circulation pipeline, and regeneration gas is passed through the circulation pipeline, and the regeneration gas is obtained from the purified gas. The booster fan 1 is a volumetric fan, and a first bypass 6 is added at the position of the booster fan 1. A valve with an adjustable opening is set on the first bypass, and the openings at both ends of the first bypass 6 are respectively connected to the inlet and outlet of the booster fan 1.

[0031] Combination Figure 1 The temperature swing adsorption purification isobaric regeneration closed circulation system of this embodiment adds a first bypass 6 at the position of the booster fan 1, so that when the booster fan 1 is started, by opening the valve on the first bypass 6, most of the regeneration gas in the circulation pipeline flows through the first bypass 6, thereby reducing the starting load and impact of the booster fan 1, allowing the booster fan 1 to start with a light load or even no load, thereby extending the service life of the booster fan 1.

[0032] In addition, when the booster fan 1 is a positive displacement fan, in the high pressure environment of the circulation pipeline, the higher the pressure, the greater the mass and flow rate of the same volume of gas. Figure 1 By changing the opening of the valve on the first bypass 6, the high-pressure gas at the outlet of the booster fan 1 can be partially returned to the inlet of the booster fan 1 through the first bypass 6, thereby reducing the pressure at the outlet of the booster fan 1. Because the entire circulation pipeline is closed, the booster fan 1 serves as the power source of the entire cycle. Therefore, the pressure difference between the inlet and outlet of the booster fan 1 is the driving force for the circulation of the regeneration gas. By adjusting the opening of the valve on the first bypass 6, the pressure difference between the inlet and outlet of the booster fan 1 can be controlled, thereby affecting the flow rate of the regeneration gas in the circulation pipeline. When the inlet and outlet temperatures of the heater 2 remain unchanged, the flow rate of the regeneration gas flowing through the heater 2 per unit time changes, thereby causing the work done by the heater 2 to change.

[0033] That is to say, the heat load of the heater 2 can be adjusted by adjusting the opening of the valve on the first bypass 6; when the heat load of the heater 2 is adjustable, not only can the entire circulation system adapt to the regeneration process under different loads and water contents, but also the selection range of the heater 2 can be wider during the design and selection stage; more importantly, if the working conditions change, such as when the water intake decreases, the amount of adsorbed water and the amount of regenerated and desorbed water are both reduced. Opening the valve on the first bypass 6 can reduce the flow rate of the regeneration gas and reduce the power of the heater 2, thereby achieving the purpose of saving energy consumption.

[0034] Preferably, in this embodiment, pressure transmitters PT are respectively provided at the inlet and outlet of the booster fan 1 , so that the pipeline pressures at the inlet and outlet sides of the booster fan 1 can be monitored by the pressure transmitter PT.

[0035] Specifically, in this embodiment, a differential pressure transmitter PDT is further provided. The differential pressure transmitter PDT is connected to both the inlet and outlet sides of the booster fan 1 to monitor the pressure difference between the inlet and outlet of the booster fan 1 .

[0036] Furthermore, in this embodiment, both the heater 2 and the cooler 4 are equipped with temperature transmitters TT at their outlets to monitor the temperatures at the outlets of the heater 2 and the cooler 4 .

[0037] The temperature swing adsorption purification isobaric regeneration closed circulation system of this embodiment enables the operation and maintenance personnel to accurately judge the working conditions in the circulation system through the monitoring values ​​of the pressure transmitter PT, the differential pressure transmitter PDT and the temperature transmitter TT, thereby ensuring the stable operation of the system.

[0038] Embodiment 2:

[0039] See also Figure 2 The present embodiment provides a temperature-swing adsorption purification isobaric regeneration closed circulation system, which is additionally provided with a second bypass 8 on the basis of the first embodiment, and the valve on the first bypass 6 is a manual valve 7, specifically: the second bypass 8 is arranged at the position of the booster fan 1, and an automatic valve 9 with adjustable opening and program control is arranged on the second bypass 8, and the openings at both ends of the second bypass 8 are respectively connected with the inlet and outlet of the booster fan 1, when the booster fan 1 is controlled to start, the automatic valve 9 is automatically opened, and the booster fan 1 is officially started after a delay of 15 seconds, and the program automatically closes the automatic valve 9 after the booster fan 1 is started.

[0040] Combination Figure 2 After the temperature swing adsorption purification isobaric regeneration closed circulation system of this embodiment is additionally added with the second bypass 8, when the booster fan 1 is started, most of the regeneration gas flows through the second bypass 8 through the automatic valve 9 which is automatically operated, so that the booster fan 1 is started with a light load or even no load, thereby extending the service life of the booster fan 1; and the first bypass 6 is used to adjust the amount of regeneration gas in the circulation pipeline, and it is only necessary to manually adjust the opening of the manual valve 7 during the debugging stage of the circulation system, and when the circulation system is operating normally, the manual valve 7 will maintain the opening locked in the debugging stage.

[0041] Obviously, the temperature-swing adsorption purification isobaric regeneration closed circulation system of the above two embodiments solves the problem of overload startup of the booster fan 1 through the application of bypass, and can also adjust the amount of regeneration gas in the circulation pipeline to adapt to more load elasticity and impurity content.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A temperature swing adsorption purification isobaric regeneration closed circulation system, comprising a booster fan (1), a heater (2), an adsorption tower (3), a cooler (4) and a separator (5), wherein the outlet of the booster fan (1) is connected to the inlet of the heater (2), the outlet of the heater (2) is connected to the inlet of the adsorption tower (3), the outlet of the adsorption tower (3) is connected to the inlet of the cooler (4), the outlet of the cooler (4) is connected to the inlet of the separator (5), and the outlet of the separator (5) is connected to the inlet of the booster fan (1) to form a circulation pipeline, and regeneration gas is passed through the circulation pipeline, and the regeneration gas is obtained from the purified gas, characterized in that: The booster fan (1) is a positive displacement fan, and a first bypass (6) is added at the position of the booster fan (1). A valve with an adjustable opening is provided on the first bypass (6), and the openings at both ends of the first bypass (6) are respectively connected to the inlet and outlet of the booster fan (1).

2. The temperature swing adsorption purification isobaric regeneration closed circulation system according to claim 1, characterized in that: The valve is a manual valve (7). A second bypass (8) is also added at the position of the booster fan (1). An automatic valve (9) with adjustable opening and controlled by a program is arranged on the second bypass (8). The openings at both ends of the second bypass (8) are respectively connected to the inlet and outlet of the booster fan (1). When the booster fan (1) is controlled to start, the automatic valve (9) automatically opens, and the booster fan (1) is officially started after a delay of 15 seconds. After the booster fan (1) is started, the program automatically closes the automatic valve (9).

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