Tail gas recovery system

Abstract

The application relates to a tail gas recovery system, belonging to the technical field of tail gas recovery, which comprises a gas-gas heat exchanger, a first circulating pipeline, a second circulating pipeline, an electric heater and a circulating fan, the gas-gas heat exchanger and a coating machine are arranged in the first circulating pipeline, tail gas of the coating machine circulates in the first circulating pipeline, the gas-gas heat exchanger is also arranged in the second circulating pipeline, the electric heater and the circulating fan are also arranged in the second circulating pipeline, and the electric heater is used for heating air in the second circulating pipeline. The tail gas recovery system provided by the application exchanges the heat of hot air in the second circulating pipeline to tail gas in the first circulating pipeline through the gas-gas heat exchanger, thereby indirectly heating the tail gas, the combustible and explosive gas in the tail gas is not easy to explode, the safety of battery electrode production is improved, air in the second circulating pipeline is heated by the electric heater, the equipment cost is low, the equipment volume is small, and the land occupation is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tail gas recovery, in particular to a tail gas recovery system. BACKGROUND

[0002] The coating machine is mainly used for the surface coating process production of thin films, paper and the like. The machine coats a roll of substrate with a layer of glue, paint or ink with specific functions, and cuts it into pieces or rolls after drying. The battery pole piece uses a coating machine for drying in the production process. The coating machine produces tail gas when drying the pole piece. In order to avoid environmental pollution and improve resource utilization, the tail gas is treated and then recycled.

[0003] In the prior art, in order to ensure the drying effect of the coating machine, the recovered tail gas needs to be heated before re-entering the coating machine. When the coating machine is drying the pole piece, flammable and explosive gas will be produced. Therefore, if the tail gas is directly heated by an electric heating device, an explosion is likely to occur. If the tail gas is heated by a steam or heat conducting oil system, there are problems of high equipment cost and large floor area. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a tail gas recovery system to solve the technical problem of difficult tail gas heating in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a tail gas recovery system, which comprises:

[0006] The gas-gas heat exchanger has a first gas passage and a second gas passage for heat exchange;

[0007] The first circulating pipeline is provided with the gas-gas heat exchanger and the coating machine. The tail gas of the coating machine circulates in the first circulating pipeline. The first circulating pipeline is connected to the first gas passage;

[0008] The second circulating pipeline is provided with the gas-gas heat exchanger. The second circulating pipeline is connected to the second gas passage;

[0009] The electric heater is arranged in the second circulating pipeline. The electric heater is used to heat the air in the second circulating pipeline; and

[0010] The circulating fan is arranged in the second circulating pipeline.

[0011] Optionally, the first circulating pipeline is further provided with a first temperature sensor for monitoring the temperature.

[0012] Optionally, the second circulating pipeline is further provided with a second temperature sensor for monitoring the temperature.

[0013] Optionally, the second circulating pipeline is further provided with a controller, and the controller is respectively connected with the electric heater, the first temperature sensor and the second temperature sensor in communication.

[0014] Optionally, the second circulating pipeline is further provided with a one-way air valve for pressure relief.

[0015] Optionally, the first circulating pipeline is further provided with a first valve for controlling flow.

[0016] Optionally, the second circulating pipeline is further provided with a second valve for controlling flow.

[0017] Optionally, the electric heater heats the air to at least 170℃.

[0018] Optionally, the air-air heat exchanger heats the tail gas to at least 130℃.

[0019] The tail gas recovery system provided by the application has the beneficial effects that, compared with the prior art, the tail gas recovery system includes an air-air heat exchanger, a first circulating pipeline, a second circulating pipeline, an electric heater and a circulating fan, the air-air heat exchanger and a coating machine are arranged in the first circulating pipeline, tail gas of the coating machine circulates in the first circulating pipeline, the air-air heat exchanger is also arranged in the second circulating pipeline, the electric heater and the circulating fan are also arranged in the second circulating pipeline, the electric heater can heat air in the second circulating pipeline, and the heat of hot air in the second circulating pipeline is exchanged to the tail gas in the first circulating pipeline through the air-air heat exchanger, thereby indirectly heating the tail gas, which is not easy to ignite flammable and explosive gas in the tail gas, improves the safety of battery electrode production, and the air in the second circulating pipeline is heated by the electric heater, which is low in equipment cost, small in equipment size and small in land occupation. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Figure 1 The structure diagram of the tail gas recovery system provided by the embodiments of the application.

[0022] Explanation of reference signs:

[0023] 1, air-air heat exchanger; 2, first circulating pipeline; 3, second circulating pipeline; 4, electric heater; 5, circulating fan; 6, first temperature sensor; 7, second temperature sensor; 8, controller; 9, one-way air valve; 10, coating machine. DETAILED DESCRIPTION

[0024] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and it is understood that similar improvements can be made by those skilled in the art in light of the above disclosure, therefore the present application is not limited to the following specific embodiments disclosed.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0026] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0027] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can be directly above or obliquely above the second feature, or simply indicate that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature can be directly below or obliquely below the second feature, or simply indicate that the first feature is lower in horizontal height than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0030] Embodiments of the present application provide a tail gas recovery system, please refer to Figure 1 , the tail gas recovery system includes a gas-gas heat exchanger 1, a first circulating pipeline 2, a second circulating pipeline 3, an electric heater 4 and a circulating fan 5, the gas-gas heat exchanger 1 has a first gas passage and a second gas passage for heat exchange, the gas-gas heat exchanger 1 and the coating machine 10 are arranged in the first circulating pipeline 2, the tail gas of the coating machine 10 circulates in the first circulating pipeline 2, and the first circulating pipeline 2 is communicated with the first gas passage; the gas-gas heat exchanger 1 is arranged in the second circulating pipeline 3, and the second circulating pipeline 3 is communicated with the second gas passage; the electric heater 4 is arranged in the second circulating pipeline 3, the electric heater 4 is used for heating air in the second circulating pipeline 3, and the circulating fan 5 is arranged in the second circulating pipeline 3.

[0031] In the embodiments of the present application, the tail gas recovery system includes a gas-gas heat exchanger 1, a first circulating pipeline 2, a second circulating pipeline 3, an electric heater 4 and a circulating fan 5, the gas-gas heat exchanger 1 and the coating machine 10 are arranged in the first circulating pipeline 2, the tail gas of the coating machine 10 circulates in the first circulating pipeline 2, the gas-gas heat exchanger 1 is also arranged in the second circulating pipeline 3, the electric heater 4 and the circulating fan 5 are also arranged in the second circulating pipeline 3, the electric heater 4 can heat air in the second circulating pipeline 3, and the heat of the hot air in the second circulating pipeline 3 is exchanged to the tail gas in the first circulating pipeline 2 through the gas-gas heat exchanger 1, thereby realizing indirect heating of the tail gas, which is not easy to explode the flammable and explosive gas in the tail gas, improves the safety of the production of the battery electrode, and the air in the second circulating pipeline 3 is heated by the electric heater 4, so that the equipment cost is low, the equipment volume is small, and the land occupation is small.

[0032] In one embodiment, referring to Figure 1 , the first circulating pipeline 2 is also provided with a first temperature sensor 6 for monitoring temperature, so as to monitor the temperature of the tail gas circulating back to the coating machine 10 in real time.

[0033] In one embodiment, referring to Figure 1 , the second circulating pipeline 3 is also provided with a second temperature sensor 7 for monitoring temperature, so as to monitor the temperature of the heated air in the second circulating pipeline 3 in real time.

[0034] In one embodiment, referring to Figure 1 , the second circulating pipeline 3 is also provided with a controller 8, which is respectively connected to the electric heater 4, the first temperature sensor 6 and the second temperature sensor 7.

[0035] In summary, if the first temperature sensor 6 monitors that the temperature of the tail gas does not meet the standard, or the second temperature sensor 7 monitors that the heating temperature of the air does not meet the standard, the controller 8 can timely adjust the working parameters of the electric heater 4 to increase the heating temperature.

[0036] In one embodiment, referring to Figure 1 , the second circulating pipeline 3 is also provided with a one-way air valve 9 for pressure relief.

[0037] Through the above arrangement, after the air in the second circulating pipeline 3 is heated and warmed by the electric heater 4, the air in the second circulating pipeline 3 will expand. In order to ensure the safety of the equipment, when the pressure in the second circulating pipeline 3 exceeds the threshold value, a part of the air will be automatically discharged outward through the one-way air valve 9 to prevent internal gas expansion.

[0038] In one embodiment, the first circulating pipeline 2 is also provided with a first valve for controlling flow, so as to control the flow of the tail gas in the first circulating pipeline 2.

[0039] In one embodiment, the second circulating pipeline 3 is also provided with a second valve for controlling flow, so as to control the flow of the air in the second circulating pipeline 3.

[0040] In one embodiment, referring to Figure 1 , the electric heater 4 at least heats the air to 170℃, so as to ensure that the temperature of the air entering the air-air heat exchanger 1 is high enough to ensure the heating effect on the tail gas.

[0041] In one embodiment, referring to Figure 1 , the air-air heat exchanger 1 at least heats the tail gas to 130℃, so as to ensure that the temperature of the tail gas entering the coating machine 10 is high enough to ensure the drying effect of the coating machine 10.

[0042] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0043] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A tail gas recovery system characterized by, The application relates to a gas-gas heat exchanger, comprising: a gas-gas heat exchanger having a first gas passage and a second gas passage for heat exchange; a first circulation pipeline, the gas-gas heat exchanger and a coating machine are arranged in the first circulation pipeline, tail gas of the coating machine flows in the first circulation pipeline in a circulating manner, and the first circulation pipeline is communicated with the first gas passage; a second circulation pipeline, the gas-gas heat exchanger is arranged in the second circulation pipeline, and the second circulation pipeline is communicated with the second gas passage; an electric heater arranged in the second circulation pipeline, the electric heater is used for heating air in the second circulation pipeline; and a circulating fan arranged in the second circulation pipeline. A first temperature sensor for monitoring temperature is further arranged in the first circulation pipeline.

2. The tail gas recovery system of claim 1, wherein, A second temperature sensor for monitoring temperature is further arranged in the second circulation pipeline.

3. The tail gas recovery system of claim 2, wherein, A controller is further arranged in the second circulation pipeline, and the controller is respectively connected in communication with the electric heater, the first temperature sensor and the second temperature sensor.

4. The tail gas recovery system of claim 3, wherein, A one-way air valve for pressure relief is further arranged in the second circulation pipeline.

5. The tail gas recovery system according to any one of claims 1 to 4, characterized in that A first valve for controlling flow is further arranged in the first circulation pipeline.

6. The exhaust gas recovery system of any one of claims 1-4, wherein, A second valve for controlling flow is further arranged in the second circulation pipeline.

7. The exhaust gas recovery system of any one of claims 1-4, wherein, The electric heater heats the air to at least 170 DEG C.

8. The exhaust gas recovery system of any one of claims 1-4, wherein, The gas-gas heat exchanger heats the tail gas to at least 130 DEG C.

9. The exhaust gas recovery system of any one of claims 1-4, wherein, ​

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