Flue gas catalytic oxidation and desulfurization integrated device

Abstract

The utility model discloses a flue gas catalytic oxidation desulfurization integrated device, which belongs to the technical field of flue gas purification, and comprises a desulfurization tank and a catalytic oxidation tank which are arranged in parallel, the top of the desulfurization tank is provided with a flue gas inlet, and an inner cavity is provided with a desulfurization layer, a heat exchange layer and a heating layer; the desulfurization tank is communicated with the bottom of the catalytic oxidation tank through a lower flue gas channel; an exhaust port is formed in the top of the catalytic oxidation tank, a catalytic oxidation layer is arranged on the lower portion of an inner cavity of the catalytic oxidation tank, a baffle plate is arranged on the upper portion of the inner cavity of the catalytic oxidation tank, and an upper smoke channel and a middle smoke channel communicated with the upper portion and the lower portion of a shell pass of the heat exchange layer are arranged above and below the baffle plate respectively. Flue gas enters the catalytic oxidation tank after being desulfurized and heated through the desulfurization tank, the flue gas is subjected to catalytic oxidation through the catalytic oxidation layer, the flue gas is in an S shape through the baffle plate, and waste heat can be transmitted to flue gas to be treated through the heat exchange layer. The flue gas is desulfurized through the desulfurization layer to reduce the influence on the catalyst, and the flue gas is heated through the heat exchange layer and the heating layer, so that the removal effect of carbon monoxide can be improved, and the recycling of heat is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flue gas purification technical field, especially related to a flue gas catalytic oxidation desulfurization integrated device. BACKGROUND

[0002] Carbon monoxide is a common atmospheric pollutant, which is flammable, toxic and one of the causes of photochemical smog, causing serious harm to the ecological environment. Carbon monoxide in the atmosphere mainly comes from steel sintering flue gas. At present, catalytic oxidation method is an important method to realize carbon monoxide emission reduction.

[0003] However, the existing flue gas purification technology requires high temperature and high energy consumption, and has poor adaptability to the environment. Moreover, the removal effect is not good. Therefore, there is an urgent need to develop a flue gas purification equipment with better CO catalytic oxidation effect. UTILITY MODEL CONTENT

[0004] In order to solve the above problems, the utility model provides a flue gas catalytic oxidation desulfurization integrated device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A flue gas catalytic oxidation desulfurization integrated device, comprising a desulfurization tank and a catalytic oxidation tank connected in parallel, the top of the desulfurization tank is provided with a flue gas inlet, the inner cavity of the desulfurization tank is sequentially provided with a desulfurization layer, a heat exchange layer and a heating layer from top to bottom; the bottom of the desulfurization tank and the catalytic oxidation tank are communicated through a flue gas downward channel; the top of the catalytic oxidation tank is provided with an exhaust port, the inner cavity of the catalytic oxidation tank is provided with a catalytic oxidation layer at the lower part, and the inner cavity of the catalytic oxidation tank is provided with a baffle at the upper part; the baffle is provided with a flue gas upward channel and a flue gas middle channel which are respectively communicated with the upper part and the lower part of the shell side of the heat exchange layer.

[0007] Further, the desulfurization layer is provided with a grid filled with desulfurizing agent, and the bottom of the desulfurization layer is provided with a screen; the side wall of the desulfurization tank is provided with an access door at the position corresponding to the desulfurization layer.

[0008] Further, the heat exchange layer is provided with a heat exchanger, the top of the heat exchanger is connected with the desulfurization layer, and the side wall of the desulfurization tank between the bottom of the heat exchanger and the heating layer is provided with a temperature measuring element; the flue gas penetrating through the desulfurization layer can pass through the tube side of the heat exchanger from top to bottom.

[0009] Further, the heating layer is provided with an electric heater, the control part of the electric heater is arranged outside the desulfurization tank, and the heating part of the electric heater extends into the desulfurization tank.

[0010] Further, the heating layer is provided with a dust cleaning area below, and a dust cleaning door is arranged on the sidewall of the desulfurization tank of the dust cleaning area; the flue gas lower passage is communicated with the dust cleaning area of the desulfurization tank and the bottom buffer cavity of the catalytic oxidation tank, and a temperature measuring element is arranged on the sidewall of the heat preservation cavity.

[0011] Further, the catalytic oxidation layer is arranged above the buffer cavity, and the catalytic oxidation layer is provided with a grid filled with catalyst, and the top of the grid is provided with a ceramic saddle ring, and the bottom is provided with a screen mesh; and a manhole door is arranged on the sidewall of the catalytic oxidation tank and corresponds to the position of the catalytic oxidation layer.

[0012] Further, the catalytic oxidation layer and the baffle are provided with a heat preservation cavity, a temperature measuring element is arranged on the sidewall of the catalytic oxidation tank and extends to the heat preservation cavity, the baffle is arranged at the middle position of the heat exchanger, one end of the baffle is connected with the inner wall of the catalytic oxidation tank, and the other end of the baffle extends to the middle position of the heat exchanger of the desulfurization tank; the flue gas middle passage is communicated with the tube side inlet of the heat exchanger, and the flue gas upper passage is communicated with the tube side outlet of the heat exchanger.

[0013] Further, the inner wall of the cavity surrounded by the sidewall of the catalytic oxidation tank corresponding to the heat preservation cavity and the bottom surface of the baffle is provided with an inner heat preservation layer, and the outer part of the desulfurization tank and the catalytic oxidation tank is provided with an outer heat preservation layer.

[0014] Further, the desulfurization tank and the catalytic oxidation tank are arranged on the base.

[0015] The technical progress achieved by the utility model compared with the prior art is that:

[0016] The utility model discloses a desulfurization tank, heat exchanger and catalytic oxidation tank are arranged in the desulfurization tank in sequence from top to bottom, and the flue gas is desulfurized and heated, and then enters the catalytic oxidation tank, the carbon monoxide in the flue gas is catalytically oxidized through the catalytic oxidation layer, and the flue gas is passed through the shell side of the heat exchanger in S shape through the baffle after processing, so that the waste heat of the flue gas is transferred to the flue gas to be processed. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings are used to provide further understanding of the utility model and constitute a part of the specification, are used to explain the utility model together with the embodiments of the utility model, and do not constitute the limitation on the utility model.

[0018] In the drawings:

[0019] Figure 1A schematic diagram of the internal structure of an integrated flue gas catalytic oxidation desulfurization device provided in an embodiment of this utility model;

[0020] Figure 2 This is an external view of the integrated flue gas catalytic oxidation desulfurization device in an embodiment of this utility model.

[0021] In the picture:

[0022] 100-Desulfurization tank; 101-Lower flue gas passage; 102-Middle flue gas passage; 103-Upper flue gas passage; 104-Cleaning area; 200-Catalytic oxidation tank; 201-Buffer chamber; 202-Insulation chamber; 1-Flue gas inlet; 2-Desulfurization layer; 3-Heat exchange layer; 4-Heating layer; 5-Cleaning door; 6-Catalytic oxidation layer; 7-Exhaust port; 8-Inspection door; 9-Manhole; 10-Temperature measuring element; 11-Base; 12-Inner insulation layer; 13-Outer insulation layer; 14-Screen; 15-Baffle plate; 16-Ceramic saddle ring. Detailed Implementation

[0023] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0024] like Figure 1 , Figure 2 As shown, an integrated flue gas catalytic oxidation desulfurization device includes a desulfurization tank 100 and a catalytic oxidation tank 200 connected in parallel. The top of the desulfurization tank 100 is provided with a flue gas inlet 1. The inner cavity of the desulfurization tank 100 is provided with a desulfurization layer 2, a heat exchange layer 3, and a heating layer 4 from top to bottom. The bottom of the desulfurization tank 100 and the catalytic oxidation tank 200 are connected by a lower flue gas channel 101. The top of the catalytic oxidation tank 200 is provided with an exhaust port 7. The lower part of the inner cavity of the catalytic oxidation tank 200 is connected to the catalytic oxidation layer 6. The upper part of the inner cavity of the catalytic oxidation tank 200 is provided with a baffle plate 15. The upper and lower parts of the baffle plate 15 are respectively provided with an upper flue gas channel 103 and a middle flue gas channel 102 that are connected to the upper and lower parts of the shell side of the heat exchange layer 3. The flue gas to be treated first undergoes desulfurization in the desulfurization layer of the desulfurization tank to avoid catalyst poisoning. The pretreated flue gas then enters the heat exchange layer to exchange heat with the discharged flue gas, achieving the purpose of preheating. After being heated by the heating layer, the flue gas enters the catalytic oxidation layer of the catalytic oxidation tank to react with the catalyst. The treated flue gas transfers the residual heat to the flue gas to be treated through the heat exchange layer and is finally discharged through the exhaust port. Figure 1 The red arrow in the middle indicates the direction of the smoke flow.

[0025] As a preferred structure, such as Figure 1 , 2As shown, the desulfurization layer 2 is provided with a grid filled with desulfurizer, and the bottom of the desulfurization layer is provided with a screen 14 to avoid desulfurizer leakage; the side wall of the desulfurization tank 100 is provided with an access door 8 corresponding to the position of the desulfurization layer 2 to facilitate replacement of the desulfurizer. The desulfurizer can be selected from several common desulfurizers such as calcium oxide and magnesium oxide, which can remove sulfur oxides (SO2 and SO3) in flue gas. The grid supports the desulfurizer, allowing flue gas to fully contact the desulfurizer and improving desulfurization efficiency. Desulfurization of flue gas by desulfurizer avoids catalyst poisoning and affects subsequent catalytic efficiency.

[0026] In the specific embodiments of the present application, as shown in Figure 1 As shown, the heat exchange layer 3 is provided with a heat exchanger, the top of the heat exchanger is connected with the desulfurization layer 2, and the bottom of the heat exchanger is provided with a temperature measuring element 10 on the side wall of the desulfurization tank 100 between the desulfurization layer 2 and the heating layer 4 to measure the temperature of flue gas in real time; the flue gas passing through the desulfurization layer 2 can pass through the tube side of the heat exchanger from top to bottom. During installation, the upper and lower support frames of the heat exchanger can be connected with the inner wall of the desulfurization tank, and the heat exchange tubes of the heat exchanger are open at the top and bottom to facilitate the flow of flue gas from top to bottom; the outer wall of the heat exchange tube is covered with heat exchange fins, which facilitates heat exchange between the flue gas passing through the gap between the heat exchange tubes and the flue gas inside the heat exchange tube.

[0027] In specific design, the heating layer 4 is provided with an electric heater, the control part 41 of the electric heater is arranged outside the desulfurization tank 100, and the heating part 42 of the electric heater extends into the desulfurization tank 100. The control part 41 is connected with a power supply, and the heating part 42 is composed of a plurality of parallel heating rods, which are arranged horizontally to facilitate heating of flue gas. Adjusting the power of the electric heater can adjust the heating temperature of the flue gas. At the same time, the temperature measuring element below the heat exchange layer and the catalytic oxidation layer is used to monitor the temperature of the incoming gas and the temperature reaching the catalyst, to improve the reaction efficiency and make the reaction more complete. According to the needs of the catalyst for temperature, adjustments can be made at any time.

[0028] Further optimization of the above scheme, as shown in Figure 1 The heating layer 4 is provided with a dust cleaning area 104, and the side wall of the desulfurization tank 100 of the dust cleaning area 104 is provided with a dust cleaning door 5; the flue gas lower passage 101 communicates the dust cleaning area 104 of the desulfurization tank 100 and the bottom buffer cavity 201 of the catalytic oxidation tank 200, and the side wall of the heat preservation cavity 202 is provided with a temperature measuring element 10. Since the flue gas changes direction and speed when passing through the flue gas lower passage, dust will accumulate at the bottom of the desulfurization tank. The dust cleaning door is opened regularly to facilitate cleaning of the accumulated dust and reduce the impact of dust accumulation on the entire device.

[0029] In the specific embodiments of the present application, as shown in Figure 1 ,2 As shown, the catalytic oxidation layer 6 is arranged above the buffer cavity 201, a temperature measuring element 10 extending to the buffer cavity 201 is arranged on the side wall of the catalytic oxidation tank 200; the catalytic oxidation layer 6 is provided with a grid filled with catalyst, the top of the grid is provided with a ceramic saddle ring 16, and the bottom is provided with a screen 14; a manhole door 9 is arranged on the side wall of the catalytic oxidation tank 200 corresponding to the position of the catalytic oxidation layer 6, facilitating maintenance and replacement. The catalyst can be selected from a noble metal catalyst, especially a catalyst based on platinum (Pt) and palladium (Pd). The solid catalyst filled in the grid can make the flue gas fully contact and react with the catalyst, and catalytically oxidize the carbon monoxide in the flue gas to carbon dioxide to the maximum extent, thereby improving the catalytic oxidation effect; meanwhile, the ceramic saddle ring is beneficial to the smooth passage of the flue gas.

[0030] In specific design, the catalytic oxidation layer 6 and the baffle plate 15 are provided with a heat preservation cavity 202, the baffle plate 15 is arranged at the middle position of the heat exchanger, one end of the baffle plate 15 is connected with the inner wall of the catalytic oxidation tank 200, and the other end of the baffle plate 15 extends to the middle position of the heat exchanger of the desulfurization tank 100; the flue gas middle passage 102 is in communication with the tube side inlet of the heat exchanger, and the flue gas upper passage 103 is in communication with the tube side outlet of the heat exchanger. After the flue gas reacts with the catalyst, the carbon monoxide is catalytically oxidized to release heat, and the temperature of the flue gas is increased. The flue gas can pass through the heat exchange layer in an S shape through the baffle plate, so that the high-temperature flue gas after treatment can be heat-exchanged with the newly-entered flue gas in the heat exchange pipe, the waste heat of the flue gas is recycled, and the energy consumption of the electric heater is reduced.

[0031] Further optimization of the above scheme, the inner wall of the cavity surrounded by the side wall of the catalytic oxidation tank 200 corresponding to the catalytic oxidation layer 6 and the bottom surface of the baffle plate 15 is provided with an inner heat preservation layer 12; the outer part of the desulfurization tank 100 and the catalytic oxidation tank 200 is provided with an outer heat preservation layer 13. The inner heat preservation layer and the outer heat preservation layer can not only ensure the required temperature of catalytic oxidation, but also avoid affecting other parts.

[0032] In specific installation, the desulfurization tank 100 and the catalytic oxidation tank 200 are arranged on the base 11, facilitating overall movement.

[0033] In summary, the utility model has the advantages of simple and compact structure, good flue gas purification effect, pre-desulfurization of flue gas by the desulfurization layer, avoidance of catalyst poisoning and influence on catalytic efficiency, accurate control of the temperature of flue gas by the cooperation of the temperature measuring element and the electric heater, catalytic oxidation at a suitable temperature, improvement of the removal effect of carbon monoxide, combination of heat recycling, improvement of heat energy utilization rate and reduction of energy consumption. The utility model has good economic and social benefits, simple process, easy industrial implementation and application.

[0034] It should be pointed out finally that: the above only for the preferred embodiments of the present application have, and not for limiting the present application, although the present application is described in detail with reference to the foregoing embodiments, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the scope of protection of the claims of the present application.

Claims

1. An integrated flue gas catalytic oxidation desulfurization device, characterized in that: The device comprises a desulfurization tank and a catalytic oxidation tank connected in parallel, the top of the desulfurization tank is provided with a flue gas inlet, the inner cavity of the desulfurization tank is sequentially provided with a desulfurization layer, a heat exchange layer and a heating layer from top to bottom, the bottom of the desulfurization tank and the catalytic oxidation tank are connected through a flue gas lower passage, the top of the catalytic oxidation tank is provided with an exhaust port, the lower part of the inner cavity of the catalytic oxidation tank is provided with a catalytic oxidation layer, the upper part of the inner cavity of the catalytic oxidation tank is provided with a baffle, a heat preservation cavity is arranged between the catalytic oxidation layer and the baffle, the upper and lower parts of the baffle are respectively provided with a flue gas upper passage and a flue gas middle passage which are connected with the upper and lower parts of the shell side of the heat exchange layer.

2. The device according to claim 1, characterized in that: The desulfurization layer is provided with a grid filled with desulfurizer, and the bottom of the desulfurization layer is provided with a screen.

3. The device according to claim 1, characterized in that: The heat exchange layer is provided with a heat exchanger, the top of the heat exchanger is connected with the desulfurization layer, the side wall of the desulfurization tank between the bottom of the heat exchanger and the heating layer is provided with a temperature measuring element, and the flue gas passing through the desulfurization layer can pass through the tube side of the heat exchanger from top to bottom.

4. The device according to claim 3, characterized in that: The heating layer is provided with an electric heater, the control part of the electric heater is arranged outside the desulfurization tank, and the heating part of the electric heater extends into the desulfurization tank.

5. The device according to claim 4, characterized in that: The lower part of the heating layer is provided with a dust cleaning area, the side wall of the desulfurization tank of the dust cleaning area is provided with a dust cleaning door, the flue gas lower passage connects the dust cleaning area of the desulfurization tank and the bottom buffer cavity of the catalytic oxidation tank, and the side wall of the heat preservation cavity is provided with a temperature measuring element.

6. The device according to claim 5, characterized in that: The catalytic oxidation layer is arranged above the buffer cavity, the catalytic oxidation layer is provided with a grid filled with catalyst, the top of the grid is provided with a ceramic saddle ring, and the bottom of the grid is provided with a screen.

7. The device according to claim 3, characterized in that: The side wall of the catalytic oxidation tank is provided with a temperature measuring element extending into the heat preservation cavity, the baffle is arranged at the middle part of the heat exchanger, one end of the baffle is connected with the inner wall of the catalytic oxidation tank, the other end of the baffle extends to the middle part of the heat exchanger of the desulfurization tank, the flue gas middle passage is connected with the tube side inlet of the heat exchanger, and the flue gas upper passage is connected with the tube side outlet of the heat exchanger.

8. The device according to claim 1, characterized in that: The inner wall of the cavity surrounded by the side wall of the catalytic oxidation tank corresponding to the heat preservation cavity and the bottom surface of the baffle is provided with an inner heat preservation layer, and the outer part of the desulfurization tank and the catalytic oxidation tank is provided with an outer heat preservation layer.

9. The device according to any one of claims 1-8, characterized in that: The desulfurization tank and the catalytic oxidation tank are arranged on the base.

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