Waste incineration flue gas treatment system

Abstract

The utility model belongs to the technical field of waste incineration disposal, and relates to a waste incineration flue gas treatment system, a gas-gas heat exchanger is respectively communicated with a wet electric dust collector, a hot blast stove, a fan and a chimney, the hot blast stove is communicated with a CO reactor, and the CO reactor is communicated with the fan; the CO reactor comprises a second sealing shell located on the outermost layer, two CO catalyst arrangement layers located on the upper portion and a CO catalyst standby layer located on the lower portion are arranged in the second sealing shell, CO catalysts are placed on the CO catalyst arrangement layers, a reactor inlet is formed in one side of the upper portion of the second sealing shell, and a reactor outlet is formed in one side of the lower portion of the second sealing shell. And a plurality of airflow uniform distribution regulators are arranged at positions corresponding to the inlet of the reactor and are of grid structures. The device is simple in structure, convenient to install, small in investment and low in production cost, stable operation and up-to-standard emission of a waste incineration system can be achieved, and CO emission is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste incineration disposal, and in particular relates to a waste incineration flue gas treatment system. Background Art

[0002] With the continuous advancement of the country's "dual carbon" strategy, the government has also increased relevant control over CO emissions from incineration companies. Limited by the technical characteristics of existing equipment, CO emissions from existing waste incineration production lines have exceeded the standard to varying degrees, which is inconsistent with the current environmental management concept and the overall background of carbon emission reduction.

[0003] The existing CO emission control measures mainly meet the CO emission targets by stopping the waste feed, which not only has a huge impact on the waste incineration conditions, but also greatly reduces the amount of waste disposal. The existing single-function flue gas treatment environmental protection devices cannot significantly reduce CO emissions. Utility Model Content

[0004] The purpose of this utility model is to provide a waste incineration flue gas treatment system that can reduce CO emissions, so as to solve the problem of unstable CO emissions and excessive emissions in the current waste incineration production line. This utility model is achieved through the following technical solutions:

[0005] A waste incineration flue gas treatment system comprises a wet electrostatic precipitator, an air-to-air heat exchanger, a hot blast stove, a fan, a CO reactor and a chimney, wherein the air-to-air heat exchanger is respectively connected to the wet electrostatic precipitator, the hot blast stove, the fan and the chimney, the hot blast stove is connected to the CO reactor, and the CO reactor is connected to the fan; the CO reactor comprises a sealed shell II, wherein two layers of CO catalyst arrangement layers and a layer of CO catalyst standby layer are arranged inside the sealed shell II, a CO catalyst is placed on the CO catalyst arrangement layer, a reactor inlet is arranged on one side of the upper portion of the sealed shell II, a reactor outlet is arranged on one side of the lower portion of the sealed shell II, a plurality of airflow uniformity regulators are arranged at positions corresponding to the reactor inlet, and the airflow uniformity regulators are of a grid structure.

[0006] Preferably, the bottom of the CO reactor is a cone or square cone structure.

[0007] Preferably, the inlet of the wet electrostatic precipitator is arranged at the bottom of one side, and the outlet of the wet electrostatic precipitator is arranged at the upper part of the other side.

[0008] Preferably, the air-to-air heat exchanger comprises a sealed shell 1, on which are provided air inlet 1, air inlet 2, air outlet 1 and air outlet 2, air inlet 1 being connected to the outlet of the wet electrostatic precipitator, air outlet 1 being connected to the hot air furnace, air inlet 2 being connected to the fan, and air outlet 2 being connected to the chimney.

[0009] Preferably, the sealed shell one at the air outlet one and the air inlet one of the air-to-air heat exchanger is an open structure, and the sealed shell one at the air inlet two and the air outlet two is a closed structure, and a plurality of heat exchange tube bundle bodies are installed in the closed structure between the air inlet two and the air outlet two, the heat exchange tube bundle body connects the air inlet two and the air outlet two, and the inner wall of the sealed shell one and the outer wall of the heat exchange tube bundle body form a smoke return smoke box.

[0010] Preferably, a manhole door is provided at the lower portion of the sealed shell 1 of the air-to-air heat exchanger.

[0011] Preferably, the heat source used by the hot blast furnace includes but is not limited to oil, gas or electricity.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] It has a simple structure, is easy to install, requires little investment, and has low production costs. It can achieve stable operation of the waste incineration system, ensure that the incineration flue gas meets emission standards under normal operating conditions, and can also effectively reduce CO emissions under unconventional operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the structure of a waste incineration flue gas treatment system according to an embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of an air-to-air heat exchanger according to an embodiment of the utility model;

[0017] Figure 3 This is a structural front view of a CO reactor according to an embodiment of the utility model;

[0018] Figure 4 for Figure 3 Left view of;

[0019] In the figure, 1 is a wet electrostatic precipitator, 2 is an air-to-air heat exchanger, 3 is a hot blast furnace, 4 is a fan, 5 is a CO reactor, 6 is a chimney, 7 is an air outlet 1, 8 is an air inlet 1, 9 is an air outlet 2, 10 is an air inlet 2, 11 is a heat exchange tube bundle body, 12 is a flue gas return box, 13 is a manhole door, 14 is a reactor inlet, 15 is an air flow uniformity regulator, 16 is a CO catalyst, and 17 is a reactor outlet. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The following embodiments are only exemplary and can only be used to explain and illustrate the technical solution of the utility model, and cannot be interpreted as limiting the technical solution of the utility model.

[0021] like Figure 1 As shown, the utility model provides a waste incineration flue gas treatment system, including a wet electrostatic precipitator 1, an air-to-air heat exchanger 2, a hot blast furnace 3, a fan 4, a CO reactor 5 and a chimney 6. The air-to-air heat exchanger 2 is connected to the wet electrostatic precipitator 1, the hot blast furnace 3, the fan 4 and the chimney 6 through a closed pipeline, the hot blast furnace 3 is connected to the CO reactor 5 through a closed pipeline, and the CO reactor 5 is connected to the fan 4 through a closed pipeline.

[0022] The inlet of the wet electrostatic precipitator 1 is arranged at the bottom of one side, and the outlet of the wet electrostatic precipitator 1 is arranged at the upper part of the other side. The wet electrostatic precipitator 1 is a dust removal device for the flue gas generated after the incineration of waste. After the flue gas passes through the wet electrostatic precipitator 1, the dust content in the flue gas can be reduced to 5mg / m 3 , meeting the conditions for entering the rear-end CO reactor 5 and reducing the risk of blockage of the CO reactor 5.

[0023] The gas-to-gas heat exchanger 2 is a flue gas-to-flue gas heat exchange device that adopts a convection heat exchange form. Figure 2 As shown, the air-to-air heat exchanger 2 includes a sealed shell 1 located at the outermost layer, and the sealed shell 1 is provided with an air inlet 1 8, an air inlet 2 10, an air outlet 1 7 and an air outlet 2 9. The air inlet 1 8 is connected to the outlet of the wet electrostatic precipitator 1, the air outlet 1 7 is connected to the hot air furnace 3, the air inlet 2 10 is connected to the fan 4, and the air outlet 2 9 is connected to the chimney 6. Among them, the sealed shell 1 at the air outlet 1 7 and the air inlet 1 8 is an open structure, and the sealed shell 1 at the air inlet 2 10 and the air outlet 2 9 is a closed structure. A plurality of heat exchange tube bundle bodies 11 are fixedly installed at the closed structure of the shell between the air inlet 2 10 and the air outlet 2 9. The heat exchange tube bundle body 11 is connected to the air inlet 2 10 and the air outlet 2 9. The inner wall of the sealed shell 1 and the outer wall of the heat exchange tube bundle body 11 form a flue gas return smoke box 12. A manhole door 13 is provided at the lower right side of the sealed housing 1, and the manhole door 13 is used for daily maintenance of the gas-to-gas heat exchanger 2.

[0024] The CO reactor 5 is a CO catalytic oxidation device, which reacts CO in the flue gas with oxygen to generate CO through a CO catalyst 16. 2 And heat. Further, if Figure 3 , 4As shown, the CO reactor 5 includes a sealed shell 2 located at the outermost layer, and the sealed shell 2 adopts a "2+1" CO catalyst 16 arrangement form inside, including two layers of CO catalyst arrangement layers located at the upper part, plus a layer of CO catalyst standby layer located at the lower part, CO catalyst 16 is placed on the two layers of CO catalyst arrangement layers, and one layer of CO catalyst standby layer is used to add CO catalyst 16 when the emission standard needs to be improved. A reactor inlet 14 is opened on one side of the upper part of the sealed shell 2, and a reactor outlet 17 is opened on one side of the lower part of the sealed shell 2. A plurality of airflow uniformity regulators 15 are arranged at the position corresponding to the reactor inlet 14. The airflow uniformity regulator 15 is a grid structure. The main purpose of the airflow uniformity regulator 15 is to make the flue gas evenly enter the CO catalyst 16 on the CO catalyst arrangement layer, and reduce the wear of the bed layer of the CO catalyst 16 by the flue gas with scattered airflow. In addition, during the production, the position of the airflow uniformity regulator 15 and the size, shape and other parameters of the air inlet and outlet of the grid structure will be determined according to the characteristics of airflow transmission, so as to ensure that the flue gas can be evenly distributed during transmission and improve the reaction rate of CO. The purpose of the spare layer is to reduce the waste of CO catalyst 16. The spare layer is only a bracket without CO catalyst 16, which can also reduce the wind resistance of the equipment. In addition, in the subsequent operation process, if there is an upgrade or abnormal situation, the spare layer can be used to add a bed of CO catalyst 16 to reduce the cost of subsequent transformation. The bottom of the CO reactor 5 can be designed as a cone or a square cone structure. The advantage of the cone or square cone structure is that it is easy to unload ash.

[0025] The hot blast stove 3 is a device for heating up flue gas; further, the heat source used by the hot blast stove 3 includes but is not limited to oil, gas or electricity.

[0026] The fan 4 is a smoke induction device in the whole system.

[0027] The chimney 6 is a smoke exhaust device in the whole system.

[0028] The main working process of this utility model is as follows:

[0029] After preliminary treatment, the incineration flue gas enters the wet electrostatic precipitator 1, which reduces the dust in the flue gas from 30mg / m 3 Reduced to 5 mg / m 3Next, the flue gas temperature drops to about 55°C in the wet electrostatic precipitator 1, and then the flue gas at about 55°C enters the air inlet 8 of the gas-to-gas heat exchanger 2, and the flue gas at about 55°C flows through the flue gas return smoke box 12 to the outlet 7. During the flow, the flue gas at about 55°C is heat-exchanged to about 160°C through the heat exchange tube bundle body 11, and the flue gas at about 160°C flows out through the outlet 7 and enters the hot blast furnace 3. The hot blast furnace 3 heats the flue gas at about 160°C to about 230°C, and then the flue gas at about 230°C enters the CO reactor 5 through the reactor inlet 14, first rectifies the flue gas through the airflow uniformity regulator 15, and then enters the bed of the CO catalyst 16. Under the action of the CO catalyst 16, the CO in the incineration flue gas is completely oxidized to achieve the purpose of purifying the gas. Catalytic oxidation is a typical gas-solid phase catalytic reaction, and its principle is that active oxygen participates in deep oxidation. In the catalytic oxidation process, the role of the CO catalyst 16 is to reduce the activation energy of the reaction and to enrich the reactant molecules on the surface of the CO catalyst 16 to increase the reaction rate. With the help of the CO catalyst 16, CO can be flamelessly oxidized and burned at a lower ignition temperature, and oxidized to CO while releasing a large amount of heat. 2 The clean flue gas after the reaction can reach about 230°C, and then the high-temperature clean flue gas of about 230°C is discharged through the reactor outlet 17, and enters the gas-to-gas heat exchanger 2 through the air inlet 2 10 under the suction of the fan 4. After the high-temperature clean flue gas of about 230°C flows through the heat exchange tube bundle body 11, it drops from 230°C to below 160°C and then enters the chimney 6 through the air outlet 2 9 for discharge. At this temperature, the incineration flue gas can achieve the effect of "preventing white smoke" without the help of the SGH heat exchanger. Compared with the use of the SGH heat exchanger, the utility model does not use steam, but uses high-temperature flue gas instead, which can reduce costs and increase profits.

[0030] In the gas-to-gas heat exchanger 2, the high-temperature flue gas of about 230°C drops to about 160°C when passing through the tube, and the low-temperature flue gas of about 55°C rises to about 160°C when passing through the shell.

[0031] In the embodiments of the utility model, the technical features not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0032] Finally, it should be noted that the above embodiments are only specific implementation methods of the present utility model, which are used to illustrate the technical solution of the present utility model, rather than to limit it, and the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solution recorded in the above embodiments within the technical scope disclosed by the present utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the present utility model, and should be covered within the protection scope of the present utility model.

Claims

1. Waste incineration flue gas treatment system, characterized in that: The invention comprises a wet electrostatic precipitator, an air-to-air heat exchanger, a hot blast stove, a blower, a CO reactor and a chimney, wherein the air-to-air heat exchanger is respectively connected to the wet electrostatic precipitator, the hot blast stove, the blower and the chimney, the hot blast stove is connected to the CO reactor, and the CO reactor is connected to the blower; the CO reactor comprises a sealed shell II, wherein two layers of CO catalyst arrangement layers and one layer of CO catalyst standby layer are arranged inside the sealed shell II, a CO catalyst is placed on the CO catalyst arrangement layer, a reactor inlet is arranged on one side of the upper part of the sealed shell II, a reactor outlet is arranged on one side of the lower part of the sealed shell II, a plurality of airflow uniformity regulators are arranged at positions corresponding to the reactor inlet, and the airflow uniformity regulators are of a grid structure.

2. The waste incineration flue gas treatment system according to claim 1, characterized in that: The bottom of the CO reactor is a cone or square cone structure.

3. The waste incineration flue gas treatment system according to claim 1, characterized in that: The inlet of the wet electrostatic precipitator is arranged at the bottom of one side, and the outlet of the wet electrostatic precipitator is arranged at the upper part of the other side.

4. The waste incineration flue gas treatment system according to claim 1, characterized in that: The air-to-air heat exchanger comprises a sealed shell 1, on which are arranged air inlet 1, air inlet 2, air outlet 1 and air outlet 2; the air inlet 1 is connected to the outlet of the wet electrostatic precipitator, the air outlet 1 is connected to the hot air furnace, the air inlet 2 is connected to the fan, and the air outlet 2 is connected to the chimney.

5. The waste incineration flue gas treatment system according to claim 4, characterized in that: The sealed shell one at the air outlet one and the air inlet one of the air-to-air heat exchanger is an open structure, and the sealed shell one at the air inlet two and the air outlet two is a closed structure. A plurality of heat exchange tube bundle bodies are installed at the closed structure between the air inlet two and the air outlet two. The heat exchange tube bundle body is connected to the air inlet two and the air outlet two. The inner wall of the sealed shell one and the outer wall of the heat exchange tube bundle body form a smoke return smoke box.

6. The waste incineration flue gas treatment system according to claim 5, characterized in that: A manhole door is provided at the lower part of the sealing shell 1 of the air-to-air heat exchanger.

7. The waste incineration flue gas treatment system according to claim 1, characterized in that: The heat source form adopted by the hot blast furnace includes but is not limited to oil, gas or electricity.

Images