Acrylic acid waste gas treatment device

Abstract

The embodiment of the invention relates to the technical field of waste gas purification, and particularly discloses an acrylic acid waste gas treatment device, which comprises a water removal unit, a waste gas liquid separation tank and a waste gas liquid separation unit, an input port of the jacket cooling element is respectively communicated with an exhaust port of the acrylic acid production device and an external cooling water supply device, and an output port of the jacket cooling element is communicated with an input port of the waste gas liquid separation tank; the heating unit comprises a first heat exchanger, a second heat exchanger and an electric heater; an input port of the catalytic reactor is communicated with an output port of the electric heater; the waste heat utilization unit is communicated with an output port of the catalytic reactor; and the chimney is communicated with the output port of the waste heat utilization unit. According to the application, the catalytic oxidation reaction efficiency of the acrylic acid waste gas in the catalytic reactor is improved, the waste gas treatment effect of the acrylic acid waste gas treatment device is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas purification, and in particular to an acrylic acid waste gas treatment device. Background Art

[0002] The petrochemical industry produces a large amount of toxic and harmful waste gas every year, and direct discharge will cause serious pollution to the environment. At present, the main way to treat the waste gas generated by acrylic acid production equipment is catalytic oxidation, which has the characteristics of no open flame, low operating temperature, small investment, low operating cost and simple operation and maintenance.

[0003] However, due to the high water vapor content in acrylic acid waste gas, when the existing acrylic acid waste gas catalytic oxidation equipment treats acrylic acid waste gas, the acrylic acid waste gas with a high water vapor content will directly enter the catalytic reactor, which will inhibit the performance of the catalyst in the catalytic reactor, affecting the catalytic oxidation reaction of acrylic acid waste gas in the catalytic reactor, and ultimately affecting the waste gas treatment effect of the acrylic acid waste gas catalytic oxidation equipment. In addition, in the traditional acrylic acid catalytic oxidation process, blockage and corrosion often occur at the waste gas inlet of the low-temperature plate heat exchanger, affecting the service life and operating stability of the acrylic acid waste gas catalytic oxidation equipment. Therefore, how to improve the waste gas treatment effect and service life of acrylic acid waste gas catalytic oxidation equipment has become an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide an acrylic acid waste gas treatment device to improve the waste gas treatment effect and service life.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] On the one hand, an acrylic acid waste gas treatment device is provided, comprising: a water removal unit, the water removal unit comprising: a jacket cooling element and a waste gas separator tank, the input port of the jacket cooling element is respectively connected to the exhaust port of the acrylic acid production device and the external cooling water supply device, the output port of the jacket cooling element is connected to the input port of the waste gas separator tank, the liquid output port of the waste gas separator tank is connected to the external condensate discharge equipment, the jacket cooling element is used to cool the acrylic acid waste gas with cooling water, and the waste gas separator tank is used to separate the cooled acrylic acid waste gas and condensed water;

[0007] The heating unit comprises: a first heat exchanger, a second heat exchanger and an electric heater, the input port of the first heat exchanger is connected to the gas output port of the waste gas separator, the input port of the second heat exchanger is connected to the output port of the first heat exchanger, the input port of the electric heater is connected to the output port of the second heat exchanger, and the first heat exchanger, the second heat exchanger and the electric heater are used to heat the cooled acrylic acid waste gas;

[0008] A catalytic reactor, wherein the input port of the catalytic reactor is connected to the output port of the electric heater, and the catalytic reactor is used to perform a catalytic oxidation reaction on the heated acrylic acid waste gas;

[0009] A waste heat utilization unit, the waste heat utilization unit is connected to the output port of the catalytic reactor, and the waste heat utilization unit is used to recover and reuse the heat in the flue gas generated after catalytic oxidation in the catalytic reactor; and

[0010] The chimney is connected with the output port of the waste heat utilization unit, and is used for discharging the treated flue gas.

[0011] In addition to or as an alternative to one or more of the features disclosed above, the jacket cooling element includes: a cooling water channel and an exhaust gas channel that are separately arranged;

[0012] The input port of the cooling water channel is connected to the external cooling water supply device, the output port of the cooling water channel is connected to the external water return device, the input port of the waste gas channel is connected to the exhaust port of the acrylic acid production device, and the output port of the waste gas channel is connected to the input port of the waste gas separator tank.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the temperature of the cooling water supplied by the cooling water supply device is 0 to 35°C;

[0014] The water content of the acrylic acid waste gas at the gas outlet of the waste gas separator is 0-15%.

[0015] In addition to one or more of the features disclosed above, or as an alternative, the waste heat utilization unit includes: a steam superheater, the steam superheater includes: a steam heating channel and a first flue gas cooling channel that are separated from each other, the input port of the steam heating channel is connected to an external saturated steam device, the output port of the steam heating channel is respectively connected to an input port of the first heat exchanger and an external superheated steam device, the input port of the first flue gas cooling channel is connected to an output port of the catalytic reactor, and the output port of the first flue gas cooling channel is respectively connected to a second heat exchanger and a chimney.

[0016] In addition to one or more of the features disclosed above, or as an alternative, the first heat exchanger includes: a first exhaust gas heating channel and a superheated steam cooling channel that are separated from each other, the input port of the first exhaust gas heating channel is connected to the gas output port of the exhaust gas separator tank, the output port of the first exhaust gas heating channel is connected to the input port of the second heat exchanger, the input port of the superheated steam cooling channel is connected to the output port of the steam heating channel, and the output port of the superheated steam cooling channel is connected to an external water storage device.

[0017] In addition to one or more of the features disclosed above, or as an alternative, the second heat exchanger includes: a second exhaust gas heating channel and a second flue gas cooling channel that are separated from each other, the input port of the second exhaust gas heating channel is connected to the output port of the first exhaust gas heating channel, the output port of the second exhaust gas heating channel is connected to the input port of the electric heater, the input port of the second flue gas cooling channel is connected to the output port of the first flue gas cooling channel, and the output port of the second flue gas cooling channel is connected to the chimney.

[0018] In addition to or as an alternative to one or more of the features disclosed above, the heating unit further includes: a first temperature sensor disposed at an output port of the second exhaust gas heating channel, and the first temperature sensor is used to sense the temperature of the acrylic acid exhaust gas at the output port of the second exhaust gas heating channel.

[0019] In addition to or as an alternative to one or more of the features disclosed above, the temperature at the inlet of the catalytic reactor is 250°C to 350°C, and the temperature at the outlet of the catalytic reactor is 350°C to 650°C.

[0020] In addition to or as an alternative to one or more of the features disclosed above, the catalytic reactor comprises: a shell, the shell having a height direction, the shell extending along the height direction;

[0021] A plurality of containing beds, wherein the plurality of containing beds are all disposed in the shell, the plurality of containing beds are all connected to the shell, and the plurality of containing beds are arranged at intervals in the height direction, and the containing beds are used to contain catalysts; and

[0022] The expansion seal is arranged on the accommodating bed and between the inner wall of the shell and the catalyst to seal the inner wall of the shell and the catalyst.

[0023] In addition to or as an alternative to one or more of the features disclosed above, along the height direction, the distance between two adjacent accommodating beds is H mm, satisfying: 300≤H≤500.

[0024] In addition to one or more of the features disclosed above, or as an alternative, the catalytic reactor also includes: a plurality of second temperature sensors, the plurality of second temperature sensors are all connected to the inner wall of the shell, and each second temperature sensor is arranged corresponding to a corresponding containing bed.

[0025] In addition to or as an alternative to one or more of the features disclosed above, the invention further comprises a flue gas circulation oxygen supplementation fan;

[0026] The input port of the flue gas circulation oxygen supplementation fan is respectively connected to the external atmosphere and the output port of the second flue gas cooling channel, and the output port of the flue gas circulation oxygen supplementation fan is connected to the input port of the first exhaust gas heating channel.

[0027] In addition to or as an alternative to one or more of the features disclosed above, the waste heat utilization unit further comprises: a steam drum, a fire tube boiler and an economizer, the economizer comprising: a desalted water heating channel and a third flue gas cooling channel which are separately arranged;

[0028] The steam drum is thermally connected to the fire tube boiler, the input port of the fire tube boiler is connected to the output port of the first flue gas cooling channel, the input port of the third flue gas cooling channel is respectively connected to the output port of the fire tube boiler and the output port of the second flue gas cooling channel, and the output port of the fire tube boiler is also connected to the input port of the flue gas circulation oxygen supply fan, the input port of the third flue gas cooling channel is connected to the chimney, the input port of the desalted water heating channel is connected to an external desalted water equipment, the output port of the desalted water heating channel is respectively connected to the input port of the steam drum and the external water storage equipment, and the output port of the steam drum is connected to the input port of the steam heating channel.

[0029] One of the above technical solutions has the following advantages or beneficial effects: the present application greatly reduces the water vapor content in the acrylic acid waste gas by setting a jacket cooling element and a waste gas separator tank to remove water vapor in the acrylic acid waste gas, so as to eliminate the influence of water vapor in the acrylic acid waste gas in the catalytic reactor on the catalyst, thereby improving the performance and life of the catalyst in the catalytic reactor, and improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor, so as to ensure the complete catalytic oxidation of the acrylic acid waste gas, and finally improve the waste gas treatment effect and service life of the acrylic acid waste gas treatment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0031] Figure 1 This is a structural view of an acrylic acid waste gas treatment device provided according to an embodiment of the present application;

[0032] Figure 2 is a structural view of a catalytic reactor provided according to an embodiment of the present application;

[0033] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0034] Description of reference numerals:

[0035] 100. Acrylic acid waste gas treatment device;

[0036] 110, water removal unit; 111, jacket cooling element; 1111, cooling water channel; 1112, waste gas channel; 112, waste gas separator tank; 113, condensate discharge pump;

[0037] 120, heating unit; 121, first heat exchanger; 1211, first exhaust gas heating channel; 1212, superheated steam cooling channel; 122, second heat exchanger; 1221, second exhaust gas heating channel; 1222, second flue gas cooling channel; 123, electric heater;

[0038] 130. Catalytic reactor; 131. Shell; 132. Accommodating bed; 133. Expansion seal; 134. Catalyst;

[0039] 140, waste heat utilization unit; 141, steam superheater; 1411, steam heating channel; 1412, first flue gas cooling channel; 142, economizer; 1421, desalted water heating channel; 1422, third flue gas cooling channel; 143, steam drum; 144, fire tube boiler;

[0040] 150. Air silencer;

[0041] 160. Air regulating valve;

[0042] 170. Flue gas circulation oxygen supply fan;

[0043] 180. Chimney. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application 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 application. In addition, the terms "first" and "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 as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] At present, the main way to treat the waste gas generated by acrylic acid production equipment is catalytic oxidation, which has the characteristics of no open flame, low operating temperature, small investment, low operating cost and simple operation and maintenance. However, due to the high water vapor content in acrylic acid waste gas, when the existing acrylic acid waste gas treatment equipment treats acrylic acid waste gas, the acrylic acid waste gas with a high water vapor content will directly enter the catalytic reactor, which will inhibit the performance of the catalyst in the catalytic reactor, affect the catalytic oxidation reaction of the acrylic acid waste gas in the catalytic reactor, and finally affect the waste gas treatment effect of the acrylic acid waste gas treatment equipment. At the same time, the radiator in the existing acrylic acid waste gas treatment equipment uses a low-temperature plate heat exchanger to heat the acrylic acid waste gas. Since the acrylic acid waste gas contains organic matter such as formaldehyde, acetaldehyde, acrolein, acetic acid, acrylic acid and acetone, the acrylic acid waste gas will react on the waste gas inlet side of the low-temperature plate heat exchanger, and then stick to the heat exchanger plate, which is easy to cause blockage and corrosion of the low-temperature plate heat exchanger, thereby affecting the service life and operation stability of the acrylic acid waste gas treatment equipment. At the same time, the catalytic reactor design of the existing acrylic acid waste gas treatment equipment is horizontally arranged and the catalyst is directly stacked, which makes it difficult to seal tightly between the catalyst and the inner wall of the catalytic reactor, thereby causing a "short circuit" in the waste gas, further affecting the catalytic oxidation reaction of the acrylic acid waste gas in the catalytic reactor, and further affecting the waste gas treatment effect of the acrylic acid waste gas treatment equipment.

[0049] In order to solve the above problems, in the embodiments of the present application, refer to Figures 1 to 3The present application provides an acrylic acid waste gas treatment device 100, which greatly reduces the content of water vapor in the acrylic acid waste gas by setting a dehydration unit 110 to remove water vapor in the acrylic acid waste gas, so as to eliminate the influence of water vapor in the acrylic acid waste gas in the catalytic reactor 130 on the catalyst, thereby improving the performance and life of the catalyst in the catalytic reactor 130, and improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor 130, so as to ensure that the acrylic acid waste gas is completely catalytically oxidized, and finally improve the waste gas treatment effect and service life of the acrylic acid waste gas treatment device 100. The first heat exchanger adopts a shell and tube structure heated by superheated steam, which can effectively alleviate the blockage and corrosion problems on the waste gas inlet side of the heat exchanger, and enhance the service life and operation stability of the acrylic acid waste gas treatment device. Among them, Figure 1 The schematic diagram of the structure of the acrylic acid waste gas treatment device 100 is shown. Figures 2 to 3 A schematic structural diagram of the catalytic reactor 130 is shown.

[0050] Specifically, the acrylic acid waste gas treatment device 100 includes: a water removal unit 110 , a heating unit 120 , a catalytic reactor 130 and a waste heat utilization unit 140 .

[0051] Specifically, the water removal unit 110 includes: a jacket cooling element 111 and a waste gas separator tank 112, the input port of the jacket cooling element 111 is respectively connected to the exhaust port of the acrylic acid production device and the external cooling water supply device, the output port of the jacket cooling element 111 is connected to the input port of the waste gas separator tank 112, the liquid output port of the waste gas separator tank 112 is connected to the external condensate discharge equipment, the jacket cooling element 111 is used to cool the acrylic acid waste gas with cooling water, and the waste gas separator tank 112 is used to separate the cooled acrylic acid waste gas and condensed water.

[0052] The heating unit 120 includes: a first heat exchanger 121, a second heat exchanger 122 and an electric heater 123. The input port of the first heat exchanger 121 is connected to the gas output port of the waste gas separator 112, the input port of the second heat exchanger 122 is connected to the output port of the first heat exchanger 121, and the input port of the electric heater 123 is connected to the output port of the second heat exchanger 122. The first heat exchanger 121, the second heat exchanger 122 and the electric heater 123 are used to heat the cooled acrylic acid waste gas.

[0053] The input port of the catalytic reactor 130 is connected to the output port of the electric heater 123 , and the catalytic reactor 130 is used to perform a catalytic oxidation reaction on the heated acrylic acid waste gas.

[0054] The waste heat utilization unit 140 is connected to the output port of the catalytic reactor 130 , and the waste heat utilization unit 140 is used to recover and reuse the heat in the flue gas generated after catalytic oxidation in the catalytic reactor 130 .

[0055] The chimney 180 is communicated with the output port of the waste heat utilization unit 140, and the chimney 180 is used to discharge the treated flue gas.

[0056] The acrylic acid waste gas includes, but is not limited to, nitrogen, water vapor, oxygen, carbon dioxide, carbon monoxide, ethylene, propylene, formaldehyde, acetaldehyde, acrolein, acetic acid, acrylic acid and acetone.

[0057] It can be understood that the present application cools the acrylic acid waste gas by setting a jacket cooling element 111, so that the water vapor in the acrylic acid waste gas is condensed from gaseous state into liquid condensed water, and the acrylic acid waste gas and the liquid condensed water are separated by the waste gas separator 112 to remove the water vapor in the acrylic acid waste gas, thereby greatly reducing the content of water vapor in the acrylic acid waste gas, so as to eliminate the influence of water vapor in the acrylic acid waste gas in the catalytic reactor 130 on the catalyst, thereby improving the performance and life of the catalyst in the catalytic reactor 130, and improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor 130, so as to ensure that the acrylic acid waste gas is completely catalytically oxidized, and finally improve the waste gas treatment effect and service life of the acrylic acid waste gas treatment device 100.

[0058] In one embodiment, the jacket cooling element 111 includes: a cooling water channel 1111 and a waste gas channel 1112 that are separated, that is, the cooling water channel 1111 and the waste gas channel 1112 are not connected to each other; the input port of the cooling water channel 1111 is connected to an external cooling water supply device, the output port of the cooling water channel 1111 is connected to an external water return device, the input port of the waste gas channel 1112 is connected to an exhaust port of an acrylic acid production device, and the output port of the waste gas channel 1112 is connected to the input port of the waste gas separator tank 112.

[0059] Illustratively, in the present application, the outer shell constituting the cooling water channel 1111 is sleeved on the outer periphery of the outer shell constituting the exhaust gas channel 1112 to form the cooling water channel 1111 and the exhaust gas channel 1112 which are separated from each other.

[0060] It can be understood that the cooling water supply device supplies cooling water to the cooling water channel 1111, and the acrylic acid waste gas generated by the acrylic acid production device is transported to the waste gas channel 1112 to exchange heat with the cooling water located in the cooling water channel 1111. The acrylic acid waste gas is cooled, and at the same time, the water vapor in the acrylic acid waste gas is condensed into liquid condensed water. The cooled acrylic acid waste gas and liquid condensed water are transported to the waste gas separator 112, and gas-liquid separation is completed in the waste gas separator 112. The gaseous acrylic acid waste gas is transported to the first heat exchanger 121, and the liquid condensed water is transported to the condensate discharge equipment for recovery. At the same time, the cooling water in the cooling water channel 1111 that has completed the heat exchange is transported to the return water device for recovery.

[0061] The present application cools the acrylic acid waste gas by exchanging heat between the acrylic acid waste gas in the waste gas channel 1112 and the cooling water in the cooling water channel 1111, and condenses the water vapor in the acrylic acid waste gas into liquid condensed water to remove the water vapor in the acrylic acid waste gas, thereby greatly reducing the water vapor content in the acrylic acid waste gas, eliminating the influence of the water vapor in the acrylic acid waste gas in the catalytic reactor 130 on the catalyst, thereby improving the performance and life of the catalyst in the catalytic reactor 130, and improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor 130, so as to ensure that the acrylic acid waste gas is completely catalytically oxidized, and finally improving the waste gas treatment effect and service life of the acrylic acid waste gas treatment device 100; at the same time, the present application does not need to set up water-absorbing materials to absorb water vapor in the acrylic acid waste gas, thereby reducing production costs and operating costs.

[0062] In one embodiment, the water removal unit 110 further includes: a condensate drain pump 113 , the input port of the condensate drain pump 113 is connected to the liquid output port of the waste gas liquid separator 112 , and the output port of the condensate drain pump 113 is connected to an external condensate drain device.

[0063] It can be understood that the present application sets up a condensate discharge pump 113 to utilize the condensate discharge pump 113 to quickly transport the liquid condensate in the waste gas separator tank 112 to an external condensate discharge device, thereby preventing the liquid condensate from accumulating in the waste gas separator tank 112 and ensuring the gas-liquid separation efficiency of the waste gas separator tank 112.

[0064] In one embodiment, the temperature of the cooling water supplied by the cooling water supply device is 0 to 35°C. That is, the temperature of the cooling water supplied by the cooling water supply device can be controlled within the range of 0 to 35°C. Exemplarily, the temperature of the cooling water supplied by the cooling water supply device can be one of 0°C, 1°C, 2°C, 3°C, 4°C, 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15°C, 17°C, 20°C, 22°C, 25°C, 27°C, 30°C, 32°C or 35°C. The above specific values ​​of the temperature of the cooling water are only given by way of example, and any value within the range of 0 to 35°C is within the protection scope of the present application.

[0065] The temperature of the cooling water supplied by the cooling water supply device can be obtained by measuring the temperature of the cooling water multiple times with a thermometer and calculating the average value.

[0066] The present application controls the temperature of the cooling water supplied by the cooling water supply device within the range of 0 to 35°C to ensure the heat exchange effect between the acrylic acid waste gas in the waste gas channel 1112 and the cooling water in the cooling water channel 1111, that is, to ensure the cooling effect of the acrylic acid waste gas in the waste gas channel 1112, to ensure better condensation of water vapor in the acrylic acid waste gas, and then to ensure better removal of water vapor in the acrylic acid waste gas, thereby greatly reducing the water vapor content in the acrylic acid waste gas, thereby improving the performance and life of the catalyst in the catalytic reactor 130, and improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor 130, to ensure complete catalytic oxidation of the acrylic acid waste gas, and ultimately improve the waste gas treatment effect and service life of the acrylic acid waste gas treatment device 100.

[0067] In a preferred embodiment of the present application, the temperature of the cooling water supplied by the cooling water supply device is 5°C.

[0068] In the present application, the jacket cooling element 111 reduces the temperature of the acrylic acid exhaust gas by 5°C to 30°C.

[0069] In one embodiment, the water content of the acrylic acid waste gas at the gas outlet of the waste gas separator 112 is 0-15%. That is, the water content of the acrylic acid waste gas at the gas outlet of the waste gas separator 112 can be controlled within the range of 0-20%. Exemplarily, the water content of the acrylic acid waste gas can be one of 0, 2%, 4%, 6%, 8%, 10%, 12%, 14% or 15%. The above specific values ​​of the water content in the acrylic acid waste gas are only given as examples, and any value within the range of 0-15% is within the protection scope of the present application.

[0070] Among them, the method for measuring the moisture content in the acrylic waste gas at the gas outlet of the waste gas separator 112 is to load glass fibers doped with phosphorus pentoxide into a drying tube, weigh its weight, pass the acrylic waste gas at the gas outlet of the waste gas separator 112 into the drying tube, stop the ventilation, and then weigh the weight of the drying tube, and calculate the moisture content by calculating the weight difference.

[0071] The present application controls the moisture content in the acrylic acid waste gas at the gas outlet of the waste gas separator 112 within the range of 0 to 15% to reduce the water vapor content in the acrylic acid waste gas, thereby improving the performance and life of the catalyst in the catalytic reactor 130, and improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor 130 to ensure that the acrylic acid waste gas is completely catalytically oxidized, ultimately improving the waste gas treatment effect and service life of the acrylic acid waste gas treatment device 100.

[0072] In a preferred embodiment of the present application, the water content of the acrylic acid waste gas at the gas outlet of the waste gas separator 112 does not exceed 10%.

[0073] In one embodiment, the waste heat utilization unit 140 includes: a steam superheater 141, the steam superheater 141 includes: a steam heating channel 1411 and a first flue gas cooling channel 1412 that are separated, that is, the steam heating channel 1411 and the first flue gas cooling channel 1412 are not connected to each other, the input port of the steam heating channel 1411 is connected to an external saturated steam device, the output port of the steam heating channel 1411 is respectively connected to the input port of the first heat exchanger 121 and the external superheated steam device, the input port of the first flue gas cooling channel 1412 is connected to the output port of the catalytic reactor 130, and the output port of the first flue gas cooling channel 1412 is respectively connected to the second heat exchanger 122 and the chimney 180. By way of example, in the present application, the output port of the first flue gas cooling channel 1412 is respectively connected to the second heat exchanger 122 and the fire tube boiler 144.

[0074] It is understandable that the high-temperature flue gas generated by the catalytic reactor 130 after the catalytic oxidation reaction has a relatively high temperature, and directly discharging it into the atmosphere will cause heat waste.

[0075] Therefore, in the present application, the high-temperature flue gas generated after the catalytic oxidation reaction in the catalytic reactor 130 is transported to the first flue gas cooling channel 1412. At the same time, the external saturated steam equipment transports the saturated steam to the steam heating channel 1411 to exchange heat with the high-temperature flue gas located in the first flue gas cooling channel 1412. The saturated steam is heated to superheated steam, and the superheated steam is respectively transported to the first heat exchanger 121 and the external superheated steam equipment. At the same time, the high-temperature flue gas located in the first flue gas cooling channel 1412 is transported to the second heat exchanger 122 and the fire tube boiler 144 after preliminary cooling.

[0076] The present application realizes the reuse of heat of high-temperature flue gas generated after catalytic oxidation reaction by setting up steam superheater 141, thereby effectively preventing heat loss, eliminating the need to set up additional equipment to heat saturated steam equipment, and reducing production costs.

[0077] In one embodiment, the pressure of the superheated steam is 2.0 MPaG and the temperature is 300°C.

[0078] In one embodiment, the first heat exchanger 121 includes: a first exhaust gas heating channel 1211 and a superheated steam cooling channel 1212 that are separated, that is, the first exhaust gas heating channel 1211 and the superheated steam cooling channel 1212 are not connected to each other, the input port of the first exhaust gas heating channel 1211 is connected to the gas output port of the exhaust gas separator tank 112, the output port of the first exhaust gas heating channel 1211 is connected to the input port of the second heat exchanger 122, the input port of the superheated steam cooling channel 1212 is connected to the output port of the steam heating channel 1411, and the output port of the superheated steam cooling channel 1212 is connected to an external water storage device.

[0079] Among them, the first heat exchanger 121 is a low-temperature shell and tube heat exchanger.

[0080] It can be understood that the acrylic acid waste gas after cooling and dehydration by the dehydration unit 110 is transported to the first waste gas heating channel 1211. At the same time, part of the superheated steam in the steam superheater 141 is transported to the superheated steam cooling channel 1212 to exchange heat with the acrylic acid waste gas located in the first waste gas heating channel 1211. The acrylic acid waste gas located in the first waste gas heating channel 1211 is initially heated and then transported to the second heat exchanger 122. At the same time, the superheated steam located in the superheated steam cooling channel 1212 is cooled into liquid hot water and transported to an external water storage device.

[0081] In the present application, the superheated steam formed by heating the acrylic acid waste gas after the catalytic oxidation reaction is used to preliminarily heat the acrylic acid waste gas after cooling and dehydration by the dehydration unit 110, so as to further realize the reuse of heat in the acrylic acid waste gas after the catalytic oxidation reaction, further prevent heat loss, and reduce production costs.

[0082] In one embodiment, in the present application, the first heat exchanger 121 includes: a shell and a connecting pipe, the connecting pipe is passed through the shell, the internal space of the connecting pipe constitutes a superheated steam cooling channel 1212, and the space between the shell and the connecting pipe constitutes a first exhaust gas heating channel 1211.

[0083] At the same time, due to the low temperature of acrylic acid waste gas, the organic matter in the acrylic acid waste gas is prone to low-temperature reaction on the inlet side of the heat exchanger, and then sticks to the heat exchanger plates, causing blockage and corrosion of the traditional plate heat exchanger.

[0084] Exemplarily, in the present application, the connecting pipe near the input port of the superheated steam cooling channel 1212 is a plain pipe, and the connecting pipe near the output port of the superheated steam cooling channel 1212 is a finned tube, so as to prevent the organic matter in the acrylic acid waste gas at the input port of the superheated steam cooling channel 1212 from adhering to the connecting pipe near the input port of the superheated steam cooling channel 1212, thereby preventing the first heat exchanger 121 from being blocked and corroded; at the same time, since the temperature of the acrylic acid waste gas rises after the initial heating at the input port of the superheated steam cooling channel 1212, the organic matter in the acrylic acid waste gas will not adhere to the connecting pipe. In the present application, the connecting pipe near the output port of the superheated steam cooling channel 1212 is set to a finned tube to increase the contact area with the acrylic acid waste gas and enhance the heating effect of the acrylic acid waste gas.

[0085] The first heat exchanger 121 adopts a shell and tube structure heated by superheated steam, which can effectively alleviate the blockage and corrosion problems at the inlet of the first exhaust gas heating channel 1211, and help to improve the life and operation stability of the acrylic acid exhaust gas treatment device.

[0086] Specifically, in the present application, the first heat exchanger 121 heats the cooled acrylic acid waste gas to a temperature of 190°C.

[0087] In one embodiment, the second heat exchanger 122 includes: a second exhaust gas heating channel 1221 and a second flue gas cooling channel 1222 which are separated from each other, the input port of the second exhaust gas heating channel 1221 is connected to the output port of the first exhaust gas heating channel 1211, the output port of the second exhaust gas heating channel 1221 is connected to the input port of the electric heater 123, the input port of the second flue gas cooling channel 1222 is connected to the output port of the first flue gas cooling channel 1412, and the output port of the second flue gas cooling channel 1222 is connected to the chimney 180.

[0088] Wherein, the second heat exchanger 122 is a high-temperature plate heat exchanger.

[0089] It can be understood that the acrylic acid waste gas after preliminary heating by the first heat exchanger 121 is transported to the second waste gas heating channel 1221, and part of the flue gas after preliminary cooling in the steam superheater 141 is transported to the second flue gas cooling channel 1222 to exchange heat with the acrylic acid waste gas in the second waste gas heating channel 1221. The acrylic acid waste gas in the second waste gas heating channel 1221 is further heated and then transported to the electric heater 123. At the same time, the flue gas in the second flue gas cooling channel 1222 is further cooled and discharged.

[0090] In the present application, the flue gas generated after catalytic oxidation is used to heat the acrylic acid waste gas that has not been catalytically oxidized, so as to further realize the reuse of the heat in the flue gas generated after the catalytic oxidation reaction, further prevent heat loss, and reduce production costs.

[0091] At the same time, the present application preliminarily heats the acrylic acid waste gas by setting a first heat exchanger 121, and further heats the acrylic acid waste gas by setting a second heat exchanger 122, so as to ensure that the acrylic acid waste gas entering the second heat exchanger 122 will not have a low-temperature reaction, thereby ensuring that the acrylic acid waste gas will not be blocked in the second heat exchanger 122 and corrode the second heat exchanger 122, thereby extending the service life of the second heat exchanger 122 and ensuring the heating efficiency and heating effect of the acrylic acid waste gas in the second heat exchanger 122.

[0092] Specifically, in the present application, the second heat exchanger 122 heats the acrylic acid waste gas preliminarily heated by the first heat exchanger 121 to 300°C.

[0093] In one embodiment, the heating unit 120 also includes: a first temperature sensor (not shown), which is arranged at the output port of the second exhaust gas heating channel 1221, and is used to sense the temperature of the acrylic acid exhaust gas at the output port of the second exhaust gas heating channel 1221.

[0094] In one embodiment, the acrylic acid waste gas treatment device 100 further includes: a controller (not shown in the figure), which is electrically or wirelessly connected to the first temperature sensor and the electric heater 123 .

[0095] Among them, the controller can be a conventional product or a conventional control chip or other conventional products that can realize the control function in this application. There is no specific limitation in this application. The controller is installed on the second heat exchanger 122, but it is not limited to this.

[0096] When the first temperature sensor detects that the temperature of the acrylic acid waste gas at the output port of the second waste gas heating channel 1221 does not reach the reaction temperature of the catalytic reactor 130, the first temperature sensor sends a sensing signal to the controller. After receiving the sensing signal, the controller sends a control instruction to the electric heater according to the feedback result to control the electric heater to further heat the acrylic acid waste gas to reach the reaction temperature of the catalytic reactor 130.

[0097] In one embodiment, the electric heater 123 is started to heat the acrylic acid waste gas only when the acrylic acid waste gas treatment device 100 starts to work. After the acrylic acid waste gas is catalytically oxidized, the treated acrylic acid waste gas can be used to heat the untreated acrylic acid waste gas, and the electric heater 123 no longer performs heating.

[0098] In one embodiment, the temperature at the inlet of the catalytic reactor 130 is 250° C. to 350° C., that is, the temperature at the inlet of the catalytic reactor 130 can be controlled within the range of 250° C. to 350° C. For example, the temperature at the inlet of the catalytic reactor 130 can be one of 250° C., 260° C., 270° C., 280° C., 290° C., 300° C., 310° C., 320° C., 330° C., 340° C. or 350° C. The above specific values ​​of the temperature at the inlet of the catalytic reactor 130 are only given as examples, and any value within the range of 250° C. to 350° C. is within the protection scope of the present application. The present application controls the temperature at the input port of the catalytic reactor 130 within the range of 250°C to 350°C to facilitate the performance of the catalyst, thereby improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor 130, thereby ensuring that the acrylic acid waste gas is completely catalytically oxidized, and ultimately improving the waste gas treatment effect and treatment efficiency of the acrylic acid waste gas treatment device 100.

[0099] The temperature at the inlet of the catalytic reactor 130 can be obtained by measuring the temperature multiple times with a thermometer and calculating the average value.

[0100] The temperature of the output port of the catalytic reactor 130 is 350°C to 650°C. That is, the temperature of the output port of the catalytic reactor 130 can be controlled within the range of 350°C to 650°C. Exemplarily, the temperature of the output port of the catalytic reactor 130 can be one of 350°C, 375°C, 400°C, 425°C, 450°C, 475°C, 500°C, 525°C, 550°C, 575°C, 600°C, 625°C or 650°C. The above specific values ​​of the temperature of the output port of the catalytic reactor 130 are only given by way of example, and any value within the range of 350°C to 650°C is within the protection scope of the present application. The present application controls the temperature of the output port of the catalytic reactor 130 within the range of 350°C to 650°C to further facilitate the performance of the catalyst, thereby improving the catalytic oxidation reaction efficiency and catalytic oxidation effect of the acrylic acid waste gas in the catalytic reactor 130, thereby ensuring that the acrylic acid waste gas is completely catalytically oxidized, and ultimately improving the waste gas treatment effect and efficiency of the acrylic acid waste gas treatment device 100.

[0101] The temperature of the outlet of the catalytic reactor 130 can be obtained by measuring the temperature multiple times with a thermometer and calculating the average value.

[0102] In a preferred embodiment, in the present application, the temperature at the input port of the catalytic reactor 130 is 300°C, and the temperature at the output port of the catalytic reactor 130 is 535°C.

[0103] In one embodiment, the catalytic reactor 130 includes a shell 131 , a containing bed 132 , and an expansion seal 133 .

[0104] Specifically, the shell 131 has a height direction Z, and the shell 131 extends along the height direction Z; multiple containing beds 132 are arranged in the shell 131, and the multiple containing beds 132 are connected to the shell 131, and the multiple containing beds 132 are arranged at intervals in the height direction Z, and the containing beds 132 are used to contain catalysts 134; the expansion seal 133 is arranged on the containing bed 132, and the expansion seal 133 is arranged between the inner wall of the shell 131 and the catalyst to seal the inner wall of the shell 131 and the catalyst 134.

[0105] The expansion seal 133 is filled with ceramic wool.

[0106] It can be understood that the present application accommodates the catalyst 134 in a plurality of accommodating beds 132 arranged at intervals in the height direction Z in the shell 131, so as to facilitate the loading of the catalyst 134 and improve the loading efficiency of the catalyst 134, and at the same time facilitate the catalyst 134 on each accommodating bed 132 to catalytically oxidize the acrylic acid waste gas respectively, and each layer of catalyst and acrylic acid waste gas will be mixed and evenly contacted again, so as to better ensure the effect of catalytic oxidation; at the same time, the present application sets an expansion seal 133 between the inner wall of the shell 131 and the catalyst to seal the inner wall of the shell 131 and the catalyst 134, so as to ensure that the acrylic acid waste gas can only flow in one direction in the shell 131, prevent the acrylic acid waste gas from flowing back between two adjacent accommodating beds 132, further ensure that each layer of catalyst and acrylic acid waste gas will be mixed and evenly contacted again, so as to better ensure the effect of catalytic oxidation and ensure that the flue gas emissions after the catalytic oxidation reaction are qualified; at the same time, the expansion seal 133 can adapt to the expansion of the shell 131 of the catalytic reactor 130 at high temperature to prevent the catalyst from being expanded, squeezed and crushed at high temperature.

[0107] In one embodiment, along the height direction Z, the spacing between two adjacent accommodating beds 132 is H mm, satisfying: 300≤H≤500. That is, the spacing H mm between two adjacent accommodating beds 132 can be controlled within the range of 300mm to 500mm. Exemplarily, the spacing H mm between two adjacent accommodating beds 132 can be 300mm, 310mm, 320mm, 330mm, 340mm, 350mm, 360mm, 370mm, 380mm, 390mm, 400mm, 420mm, 440mm, 460mm, 480mm or one of 500mm. The above specific values ​​of the spacing H mm are only given by way of example, and any value within the range of 300mm to 500mm is within the protection scope of the present application.

[0108] The present application controls the distance H mm between two adjacent containing beds 132 within the range of 300 mm to 500 mm to ensure that there is enough space between two adjacent containing beds 132, thereby ensuring that each layer of catalyst and acrylic acid waste gas are mixed and contacted evenly, thereby better ensuring the effect of catalytic oxidation and ensuring that the flue gas emissions after the catalytic oxidation reaction are qualified.

[0109] The distance H mm between two adjacent accommodating beds 132 along the height direction Z can be obtained by disassembling the catalytic reactor 130, measuring the distance between two adjacent accommodating beds 132 in the height direction Z multiple times with a measuring tool, and calculating the average value. The measuring tool can be a ruler or a vernier caliper, but is not limited thereto.

[0110] In one embodiment, the catalytic reactor 130 also includes: multiple second temperature sensors (not shown in the figure), the multiple second temperature sensors are all connected to the inner wall of the shell 131, the second temperature sensors are used to monitor the temperature inside the shell 131, and each second temperature sensor is arranged corresponding to a corresponding containing bed 132, that is, each second temperature sensor is arranged next to a corresponding containing bed 132, so as to better monitor the catalytic oxidation operation status in the catalytic reactor 130, which is beneficial to the automatic control and risk control of the catalytic oxidation reaction in the catalytic reactor 130.

[0111] In one embodiment, the acrylic acid waste gas treatment device 100 also includes: a flue gas circulation oxygen supply fan 170; the input port of the flue gas circulation oxygen supply fan 170 is connected to the external atmosphere, and the output port of the flue gas circulation oxygen supply fan 170 is connected to the input port of the first waste gas heating channel 1211.

[0112] Specifically, the acrylic acid waste gas treatment device 100 also includes: an air muffler 150 and an air regulating valve 160, the input port of the air muffler 150 is connected to the external atmosphere, the output port of the air muffler 150 is connected to the input port of the air regulating valve 160, and the input port of the flue gas circulation oxygen supply fan 170 is connected to the output port of the air regulating valve 160.

[0113] It can be understood that when the flue gas circulation oxygen supply fan 170 is started, the air is transported to the flue gas circulation oxygen supply fan 170 through the air silencer 150 and the air regulating valve 160, and then transported to the first exhaust gas heating channel 1211 of the first heat exchanger 121 through the flue gas circulation oxygen supply fan 170 to mix with the acrylic acid waste gas to supplement the amount of oxygen required for the catalytic oxidation reaction, so that the catalytic oxidation reaction in the catalytic reactor 130 can be carried out efficiently, better guaranteeing the effect of catalytic oxidation, and ensuring that the flue gas emissions after the catalytic oxidation reaction are qualified.

[0114] In the embodiments of the present application, refer to Figure 1 The waste heat utilization unit 140 further includes: a steam drum 143, a fire tube boiler 144 and an economizer 142, but is not limited thereto.

[0115] Specifically, the economizer 142 includes: a desalted water heating channel 1421 and a third flue gas cooling channel 1422 which are separated and arranged.

[0116] Specifically, the steam drum 143 is thermally connected to the fire tube boiler 144, the input port of the fire tube boiler 144 is connected to the output port of the first flue gas cooling channel 1412, the input port of the third flue gas cooling channel 1422 is respectively connected to the output port of the fire tube boiler 144 and the output port of the second flue gas cooling channel 1222, the input port of the third flue gas cooling channel 1422 is connected to the chimney 180, the input port of the desalted water heating channel 1421 is connected to an external desalted water equipment, the output port of the desalted water heating channel 1421 is respectively connected to the input port of the steam drum 143 and an external water storage equipment, and the output port of the steam drum 143 is connected to the input port of the steam heating channel 1411.

[0117] In one embodiment, the output port of the fire tube boiler 144 and the output port of the second flue gas cooling channel 1222 are also connected to the input port of the flue gas circulation oxygen supply fan 170, so as to transport part of the cooled flue gas to the first waste gas heating channel 1211 of the first heat exchanger 121 through the flue gas circulation oxygen supply fan 170 to mix with the untreated acrylic acid waste gas, so as to control the concentration of organic matter in the untreated acrylic acid waste gas, prevent the untreated acrylic acid waste gas from undergoing catalytic oxidation reaction at the input port of the catalytic reactor 130 from causing the temperature at the input port of the catalytic reactor 130 to be too high, thereby better ensuring the effect of catalytic oxidation and ensuring that the flue gas emissions after the catalytic oxidation reaction are qualified.

[0118] It can be understood that another part of the high-temperature flue gas after the preliminary cooling in the steam superheater 141 is transported to the fire tube boiler 144, and after being discharged from the fire tube boiler 144 and merging with the flue gas further cooled in the second flue gas cooling channel 1222 of the second heat exchanger 122, the partially cooled flue gas is transported to the third flue gas cooling channel 1422, and the external desalted water equipment transports the desalted water to the desalted water heating channel 1421 to exchange heat with the flue gas in the third flue gas cooling channel 1422. The cooled flue gas is further After the first step of cooling, the water is transported to the chimney 180 and discharged into the atmosphere through the chimney 180. At the same time, the desalted water is heated, and part of the heated desalted water is transported to an external water storage device for recovery, and the other part of the heated desalted water is transported to the steam drum 143. Since the steam drum 143 is thermally connected to the fire tube boiler 144, the desalted water in the steam drum 143 exchanges heat with the flue gas in the fire tube boiler 144 that has completed preliminary cooling, and the desalted water is heated to saturated steam. The saturated steam is transported to the steam heating channel 1411 of the steam superheater 141 for reuse.

[0119] The present application further realizes the reuse of heat in the flue gas generated after the catalytic oxidation reaction by providing a steam drum 143, a fire tube boiler 144 and an economizer 142, thereby further preventing heat loss and reducing production costs.

[0120] In summary, the working process of the acrylic acid waste gas treatment device 100 in the present application is as follows:

[0121] When the acrylic acid waste gas treatment device 100 is just started, the flue gas circulation oxygen supply fan 170 is started, and the air is transported to the flue gas circulation oxygen supply fan 170 through the air silencer 150 and the air regulating valve 160, and then transported to the first heat exchanger 121, the second heat exchanger 122 and the electric heater 123 through the flue gas circulation oxygen supply fan 170, and then enters the electric heater 123 to be heated to 300°C and then transported to the catalytic reactor 130.

[0122] The acrylic acid waste gas generated by the acrylic acid production device is transported to the waste gas channel 1112, and the cooling water supply device supplies cooling water to the cooling water channel 1111. The acrylic acid waste gas in the waste gas channel 1112 exchanges heat with the cooling water in the cooling water channel 1111, and the acrylic acid waste gas is cooled. At the same time, the water vapor in the acrylic acid waste gas is condensed into liquid condensed water. The cooled acrylic acid waste gas and the liquid condensed water are transported to the waste gas separator 112. After the separation action of the waste gas separator 112, ≥5 00μm droplets will be separated to complete gas-liquid separation. At this time, the water content of the gaseous acrylic acid waste gas is reduced to 10%, and the temperature is reduced to 45°C. The gaseous acrylic acid waste gas is transported to the first heat exchanger 121, the second heat exchanger 122 and the electric heater 123. After being heated to 300°C by the electric heater 123, it is transported to the catalytic reactor 130, and the liquid condensed water is transported to the condensate discharge equipment for recovery. At the same time, the cooling water that completes the heat exchange in the cooling water channel 1111 is transported to the return water device for recovery.

[0123] In the catalytic reactor 130 , the organic matter in the acrylic acid waste gas is decomposed into carbon dioxide, water and other substances through the action of the catalyst 134 , releasing heat. The acrylic acid waste gas is heated to 535° C. and discharged from the output port of the catalytic reactor 130 to the steam superheater 141 .

[0124] The high-temperature flue gas generated after the catalytic oxidation reaction in the catalytic reactor 130 is transported to the first flue gas cooling channel 1412. At the same time, the external saturated steam equipment transports the saturated steam to the steam heating channel 1411 to exchange heat with the high-temperature flue gas in the first flue gas cooling channel 1412. The saturated steam is heated to superheated steam, and the superheated steam is respectively transported to the first heat exchanger 121 and the external superheated steam equipment. At the same time, the high-temperature flue gas in the first flue gas cooling channel 1412 is transported to the second heat exchanger 122 and the fire tube boiler 144 after preliminary cooling.

[0125] At this time, the acrylic acid waste gas that has been cooled and dehydrated by the dehydration unit 110 is transported to the first waste gas heating channel 1211 of the first heat exchanger 121. At the same time, part of the superheated steam in the steam superheater 141 is transported to the superheated steam cooling channel 1212 to exchange heat with the acrylic acid waste gas in the first waste gas heating channel 1211. The acrylic acid waste gas in the first waste gas heating channel 1211 is initially heated and then transported to the second heat exchanger 122. At the same time, the superheated steam in the superheated steam cooling channel 1212 is cooled into liquid hot water and transported to an external water storage device.

[0126] The acrylic acid waste gas preliminarily heated by the first heat exchanger 121 is transported to the second waste gas heating channel 1221 of the second heat exchanger 122, and part of the flue gas preliminarily cooled in the steam superheater 141 is transported to the second flue gas cooling channel 1222 to exchange heat with the acrylic acid waste gas in the second waste gas heating channel 1221. The acrylic acid waste gas in the second waste gas heating channel 1221 is further heated and then transported to the electric heater 123. Meanwhile, the flue gas in the second flue gas cooling channel 1222 is further cooled and then discharged.

[0127] At the same time, another part of the flue gas that has completed preliminary cooling in the steam superheater 141 is transported to the fire tube boiler 144, and after being discharged from the fire tube boiler 144 and merging with the flue gas that has been further cooled in the second flue gas cooling channel 1222 of the second heat exchanger 122, part of the cooled flue gas is transported to the first exhaust gas heating channel 1211 of the first heat exchanger 121 through the flue gas circulation oxygen supply fan 170 to be mixed with the untreated acrylic acid exhaust gas; another part of the cooled flue gas is transported to the third flue gas cooling channel 1422 of the economizer 142, and the external desalted water equipment transports the desalted water to the desalted water heating channel 1421 of the economizer 142 to be mixed with the third flue gas cooling channel 1422. The flue gas in 22 undergoes heat exchange, and the flue gas is further cooled and transported to the chimney 180, and discharged into the atmosphere through the chimney 180. At the same time, the desalted water is heated, and part of the heated desalted water is transported to an external water storage device for recovery, and the other part of the heated desalted water is transported to the steam drum 143. Since the steam drum 143 is thermally connected to the fire tube boiler 144, the desalted water in the steam drum 143 exchanges heat with the flue gas in the fire tube boiler 144 that has completed preliminary cooling, and the desalted water is heated to saturated steam. The saturated steam is transported to the steam heating channel 1411 of the steam superheater 141 for reuse, and this reciprocating cycle is used to continuously catalytically oxidize the acrylic acid waste gas generated by the acrylic acid production device.

[0128] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An acrylic acid waste gas treatment device, characterized in that: include: A dewatering unit, the dewatering unit comprising: a jacket cooling element and a waste gas separator tank, the input port of the jacket cooling element being respectively connected to the exhaust port of the acrylic acid production device and the external cooling water supply device, the output port of the jacket cooling element being connected to the input port of the waste gas separator tank, the liquid output port of the waste gas separator tank being connected to the external condensate discharge device, the jacket cooling element being used to cool the acrylic acid waste gas with cooling water, and the waste gas separator tank being used to separate the cooled acrylic acid waste gas and condensed water; A heating unit, the heating unit comprising: a first heat exchanger, a second heat exchanger and an electric heater, the input port of the first heat exchanger is communicated with the gas output port of the waste gas separator, the input port of the second heat exchanger is communicated with the output port of the first heat exchanger, the input port of the electric heater is communicated with the output port of the second heat exchanger, the first heat exchanger, the second heat exchanger and the electric heater are used to heat the cooled acrylic acid waste gas; A catalytic reactor, the input port of the catalytic reactor is connected to the output port of the electric heater, and the catalytic reactor is used to perform a catalytic oxidation reaction on the heated acrylic acid waste gas; a waste heat utilization unit, the waste heat utilization unit being connected to the output port of the catalytic reactor, and the waste heat utilization unit being used to recover and reuse the heat in the flue gas generated after catalytic oxidation in the catalytic reactor; and A chimney is connected to the output port of the waste heat utilization unit, and the chimney is used to discharge the treated flue gas.

2. The acrylic acid waste gas treatment device according to claim 1, characterized in that: The jacket cooling element comprises: a cooling water channel and an exhaust gas channel which are separately arranged; The input port of the cooling water channel is connected to an external cooling water supply device, the output port of the cooling water channel is connected to an external water return device, the input port of the waste gas channel is connected to an exhaust port of an acrylic acid production device, and the output port of the waste gas channel is connected to the input port of the waste gas separator tank.

3. The acrylic acid waste gas treatment device according to claim 2, characterized in that: The temperature of the cooling water supplied by the cooling water supply device is 0-35°C; The water content of the acrylic acid waste gas at the gas outlet of the waste gas separator is 0-15%.

4. The acrylic acid waste gas treatment device according to claim 1, characterized in that: The temperature at the inlet of the catalytic reactor is 250°C to 350°C, and the temperature at the outlet of the catalytic reactor is 350°C to 650°C.

5. The acrylic acid waste gas treatment device according to claim 1, characterized in that: The catalytic reactor comprises: a shell, the shell having a height direction, the shell extending along the height direction; a plurality of containing beds, wherein the plurality of containing beds are all disposed in the shell, the plurality of containing beds are all connected to the shell, and the plurality of containing beds are arranged at intervals in the height direction, and the containing beds are used to contain catalysts; and An expansion seal is arranged on the containing bed, and the expansion seal is arranged between the inner wall of the shell and the catalyst to seal the inner wall of the shell and the catalyst.

6. The acrylic acid waste gas treatment device according to claim 5, characterized in that: Along the height direction, the distance between two adjacent accommodating beds is H mm, satisfying: 300≤H≤500.

7. The acrylic acid waste gas treatment device according to claim 5, characterized in that: The catalytic reactor further includes: a plurality of second temperature sensors, each of which is connected to the inner wall of the shell, and each of the second temperature sensors is arranged corresponding to a corresponding accommodating bed.

8. The acrylic acid waste gas treatment device according to claim 1, characterized in that: The waste heat utilization unit includes: a steam superheater, and the steam superheater includes: a steam heating channel and a first flue gas cooling channel that are separated from each other, the input port of the steam heating channel is connected to an external saturated steam device, the output port of the steam heating channel is respectively connected to an input port of the first heat exchanger and an external superheated steam device, the input port of the first flue gas cooling channel is connected to an output port of the catalytic reactor, and the output port of the first flue gas cooling channel is respectively connected to the second heat exchanger and the chimney.

9. The acrylic acid waste gas treatment device according to claim 8, characterized in that: The first heat exchanger includes: a first exhaust gas heating channel and a superheated steam cooling channel that are separated from each other, the input port of the first exhaust gas heating channel is connected to the gas output port of the exhaust gas separator, the output port of the first exhaust gas heating channel is connected to the input port of the second heat exchanger, the input port of the superheated steam cooling channel is connected to the output port of the steam heating channel, and the output port of the superheated steam cooling channel is connected to an external water storage device.

10. The acrylic acid waste gas treatment device according to claim 9, characterized in that: The second heat exchanger includes: a second exhaust gas heating channel and a second flue gas cooling channel that are separated from each other, the input port of the second exhaust gas heating channel is connected to the output port of the first exhaust gas heating channel, the output port of the second exhaust gas heating channel is connected to the input port of the electric heater, the input port of the second flue gas cooling channel is connected to the output port of the first flue gas cooling channel, and the output port of the second flue gas cooling channel is connected to the chimney.

11. The acrylic acid waste gas treatment device according to claim 10, characterized in that: The heating unit further includes: a first temperature sensor disposed at an output port of the second exhaust gas heating channel, and the first temperature sensor is used to sense the temperature of the acrylic acid exhaust gas at the output port of the second exhaust gas heating channel.

12. The acrylic acid waste gas treatment device according to claim 10, characterized in that: Also includes: Flue gas circulation oxygen supply fan; The input port of the flue gas circulation oxygen supplementation fan is respectively connected to the external atmosphere and the output port of the second flue gas cooling channel, and the output port of the flue gas circulation oxygen supplementation fan is connected to the input port of the first exhaust gas heating channel.

13. The acrylic acid waste gas treatment device according to claim 12, characterized in that: The waste heat utilization unit further comprises: a steam drum, a fire tube boiler and an economizer, wherein the economizer comprises: a desalted water heating channel and a third flue gas cooling channel which are separated and arranged; The steam drum is thermally connected to the fire tube boiler, the input port of the fire tube boiler is connected to the output port of the first flue gas cooling channel, the input port of the third flue gas cooling channel is respectively connected to the output port of the fire tube boiler and the output port of the second flue gas cooling channel, and the output port of the fire tube boiler is also connected to the input port of the flue gas circulation oxygen supply fan, the input port of the third flue gas cooling channel is connected to the chimney, the input port of the desalted water heating channel is connected to an external desalted water equipment, the output port of the desalted water heating channel is respectively connected to the input port of the steam drum and an external water storage equipment, and the output port of the steam drum is connected to the input port of the steam heating channel.

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