Hazardous waste incineration flue gas combined purification device based on waste heat recovery treatment

Abstract

The invention discloses a hazardous waste incineration flue gas combined purification device based on waste heat recovery treatment, which is used for improving a flue gas flowing process in hazardous waste flue gas treatment and mainly comprises an assembly gas tank, the assembly gas tank is used as a flue gas transfer structure in treatment equipment, capillary combination in the assembly gas tank is mainly used, and the assembly gas tank is used as a flue gas transfer structure in the treatment equipment. A communicating structure between air inlet and air outlet of smoke is achieved through the independent smoke pipes, the smoke temperature can be changed through the smoke or low-temperature water in the flowing process of the smoke in the convection bin, on the basis, the flowing process of each strand of smoke relative to the flowing process of the smoke in the assembly air box is achieved for the whole smoke treatment system, and therefore the smoke treatment efficiency is improved. The flue gas in one assembly gas tank is used as a temperature'supplement source 'of the flue gas in the other assembly gas tank, dual functions of cooling and heating are realized, and further improvement is performed aiming at the independent flue gas pipes, so that the flowing mode of the flue gas during heat exchange is limited by the gas blocking blocks, and a stable flue gas environment in the whole system is maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas purification, and particularly to a combined purification device for hazardous waste incineration flue gas based on waste heat recovery treatment. Background Art

[0002] There are a large number of highly polluting substances in hazardous waste incineration flue gas. Corresponding treatment equipment needs to be selected according to the types of pollutants. The relevant technical content disclosed in relevant documents such as the publication numbers CN112843977A, CN107376639A, and CN112870946A can be referred to, and further combined with the flue gas waste heat recovery process. The relevant content in the publication numbers CN113776061A and CN105864799A can be referred to.

[0003] The temperature of hazardous waste incineration flue gas is not lower than 850 °C, and there are differences in the flue gas temperature in different treatment processes. For example, the temperature required in SCR denitrification is 280 - 400 °C, the temperature required in wet desulfurization is 150 - 250 °C, and the temperature required in dust removal is lower than 200 °C, etc. There will be the following problems if the temperature gets out of control during the overall purification process: 1. Problems such as damage to the equipment base material (such as dust removal filter bags), accelerated equipment corrosion, energy consumption, and operating costs due to excessive temperature; 2. If the flue gas temperature is too low, it will directly affect the denitrification efficiency and even cause irreversible activity loss; It can be directly understood that the temperature of each process section must be strictly controlled during flue gas treatment, and the waste heat recovery utilization rate also needs to be improved. For this, the present invention proposes a solution. Summary of the Invention

[0004] The purpose of the present invention is to provide a combined purification device for hazardous waste incineration flue gas based on waste heat recovery treatment, which is for the process of hazardous waste incineration flue gas treatment, including waste heat recovery of flue gas and multiple treatment steps. There are differences in the requirements for flue gas temperature in each treatment step. During the overall purification process, if the temperature gets out of control, it will cause varying degrees of impact on the overall treatment equipment line, such as problems like reduced treatment efficiency and equipment loss.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A combined purification device for hazardous waste incineration flue gas based on waste heat recovery treatment is applied in a flue gas treatment system and uses a total gas tank. A capillary combination is arranged in the total gas tank. The capillary combination includes a partition plate, independent smoke pipes, and heat exchange water pipes. The independent smoke pipes are arranged in a circular array along the center point of the partition plate, and the independent smoke pipes are fixed in the partition plate along the length direction parallel to the total gas tank. The heat exchange water pipe is located inside the independent smoke pipe, and both ends of the heat exchange water pipe penetrate through to both sides of the total gas tank. The total gas tank is provided with a ventilation smoke port and an external connection smoke port, and a flue gas purification device, an external connection flue gas combination, and a water pump combination are respectively connected to the ventilation smoke port, the external connection smoke port, and both ends of the heat exchange water pipe.

[0006] It is further set that: the ventilation smoke port includes an air inlet channel and an air outlet channel, and a first-stage gas chamber and a second-stage gas chamber corresponding to the air inlet channel and the air outlet channel are respectively arranged inside the total gas tank through a partition plate.

[0007] It is further set that: a heat exchange chamber is arranged at the middle position corresponding to the two partition plates inside the total gas tank, and an intermediate partition plate is installed at the middle position corresponding to the heat exchange chamber inside the total gas tank. The heat exchange chamber is divided into two convection chambers corresponding to the external connection smoke port through the intermediate partition plate.

[0008] It is further set that: the outer diameter of the heat exchange water pipe is smaller than the inner wall diameter of the independent smoke pipe, and both ends of the heat exchange water pipe are open. The first-stage gas chamber and the second-stage gas chamber are in a communicating state through the independent smoke pipe.

[0009] It is further set that: a gas limiting part is arranged on the independent smoke pipe, the cross section of the gas limiting part is in a frustum shape along the direction from the second-stage gas chamber to the first-stage gas chamber, and a gas blocking block is installed at the external position of the heat exchange water pipe corresponding to the gas limiting part.

[0010] It is further set that: the installation position of the gas limiting part is close to the second-stage gas chamber, the installation direction of the external connection smoke port is perpendicular to the installation direction of the independent smoke pipe, and a thermocouple unit is installed at the position of the independent smoke pipe close to the first-stage gas chamber corresponding to the gas limiting part.

[0011] It is further set that: the water flow direction in the heat exchange water pipe is opposite to the direction from the air inlet channel to the air outlet channel.

[0012] It is further set that: an independent gas sleeve corresponding to the heat exchange water pipe is installed on the outer wall position of the total gas tank corresponding to the second-stage gas chamber, and the heat exchange water pipe is slidably connected with the independent gas sleeve.

[0013] It is further set that: a magnetic transmission structure is arranged at the position of the heat exchange water pipe inside the independent gas sleeve.

[0014] The present invention has the following beneficial effects: 1. The present invention improves the flue gas flow process in hazardous waste flue gas treatment. Specifically, it mainly focuses on the total gas tank, which serves as the transfer structure of the flue gas in the overall treatment system, and the independent flue pipe serves as the flow structure of the flue gas in the intake and exhaust channels. The key lies in that the flue gas in the independent flue pipe can exchange heat with the flue gas in the convection chamber to achieve the heating or cooling of the flue gas in the first-stage gas tank, or can be significantly cooled by the low-temperature water in the heat exchange water pipe. Its purpose is to change the temperature of the flue gas discharged from the second-stage gas tank to ensure that the temperature of this part of the flue gas meets the treatment temperature requirements in the treatment equipment. 2. Based on the above content for supplementary explanation, in the overall treatment system, the total gas tanks corresponding to each treatment device can be coordinated. The purpose is to ensure the flow process of each flue gas relative to the total gas tank. Its essence is: using the flue gas in a certain total gas tank as the temperature "supplementary source" for the heating / cooling of the flue gas in another total gas tank, and based on this, making local improvements to the independent flue pipe. Based on the air-blocking block in the air-limiting part, specifically, according to the temperature value in the first-stage gas tank, the temperature requirement in the second-stage gas tank, and the real-time temperature in the thermocouple unit, restricting the flow process of the flue gas in the independent flue pipe to maintain the temperature change, specifically for maintaining the stable environment of the flue gas in the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of a combined purification device for hazardous waste incineration flue gas based on waste heat recovery treatment proposed by the present invention; Figure 2 It is a sectional view of the total gas tank in the present invention; Figure 3 It is a schematic structural diagram of the capillary combination in the present invention; Figure 4 It is a schematic structural diagram of the independent flue pipe in the present invention; Figure 5 In the present invention Figure 4 sectional view; Figure 6 It is a connection schematic diagram of the total gas tank in the present invention.

[0017] In the figure: 1. Total gas tank; 2. Hot water exchange pipe; 3. External smoke outlet; 4. Ventilation smoke outlet; 5. Control assembly; 6. Intermediate partition; 7. Independent smoke pipe, 701. Gas limiting part; 702. Thermocouple unit; 703. Gas blocking block; 8. Partition board; 9. Independent gas sleeve; 10. Magnetic drive structure. Detailed implementation mode

[0018] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.

[0019] Embodiment 1: For the treatment process of hazardous waste incineration flue gas, it includes flue gas waste heat recovery and multiple treatment steps. There are differences in the requirements for flue gas temperature in each treatment step. During the overall purification process, if the temperature gets out of control, it will cause varying degrees of impact on the overall treatment equipment line, such as problems like reduced treatment efficiency and equipment loss. For this, the following technical solutions are proposed: Refer to Figures 1 - 6 , the combined purification device for hazardous waste incineration flue gas based on waste heat recovery treatment in this embodiment is applied in the flue gas treatment system. The total gas tank 1 is used, and a capillary combination is arranged in the total gas tank 1. The capillary combination includes a partition board 8, an independent smoke pipe 7, and a hot water exchange pipe 2. The independent smoke pipes 7 are arranged in a circular array along the center point of the partition board 8, and the independent smoke pipes 7 are fixed in the partition board 8 along the length direction parallel to the total gas tank 1; The hot water exchange pipe 2 is located inside the independent smoke pipe 7, and both ends of the hot water exchange pipe 2 penetrate to both sides of the total gas tank 1. The ventilation smoke outlet 4 and the external smoke outlet 3 are arranged on the total gas tank 1. The ventilation smoke outlet 4, the external smoke outlet 3, and both ends of the hot water exchange pipe 2 are respectively connected to a flue gas purification device, an external flue gas combination, and a water pump combination. The ventilation smoke outlet 4 includes an intake channel and an outlet channel. Inside the total gas tank 1, a first-order gas chamber and a second-order gas chamber corresponding to the intake channel and the outlet channel are respectively arranged through the partition board 8.

[0020] Basic principle: For the treatment process of hazardous waste flue gas, different specifications or types of treatment equipment will be used, such as denitration equipment, desulfurization equipment, etc. In this embodiment, a total gas tank 1 is added according to each treatment equipment. The total gas tank 1 is mainly used to transfer the flue gas between each treatment equipment. Taking Figure 6 as an example, each treatment equipment is arranged according to the flue gas treatment process sequence. For example, the flue gas after passing through the waste heat recovery equipment from the industrial boiler enters the total gas tank 1 from the intake channel and then is discharged from the outlet channel and enters the denitration equipment. This part is the conventional technology in the flue gas treatment process, but refer to Figure 2 for supplementary description: When the flue gas flows through the assembly gas tank 1, it specifically flows through the independent flue pipes 7. The flue gas first enters the first-stage gas chamber and gradually enters the second-stage gas chamber through the independent flue pipes. When the flue gas flows through the independent flue pipes, it will not directly enter the two convection chambers. During this process, the flue gas flowing out of other treatment equipment or heat exchangers can also flow into the two convection chambers through the external flue gas inlet 3. The flow directions of the two flue gases are perpendicular to each other, so that heat exchange can be carried out using the temperature difference. For example, if the temperature of the flue gas along the intake channel - outlet channel is higher than the temperature of the flue gas in the external flue gas inlet 3, then the flue gas in the external flue gas inlet 3 can be heated by heat exchange, thereby reducing the temperature of the flue gas in the second-stage gas chamber. Conversely, reverse heat exchange can also be carried out to increase the temperature of the flue gas in the second-stage gas chamber; Based on the above content, low-temperature water can be injected into the internal heat exchange water pipe 2. According to the process requirements, it is necessary to ensure that the temperature in the first-stage gas chamber is quickly reduced, so that the temperature of the first-stage flue gas can be reduced by using the low-temperature water. Specifically, taking the Figure 6 water pump combination as an example, the main function of the water pump combination is to continuously pump low-temperature water into the heat exchange water pipe 2 and ensure that the low-temperature water is pumped in the direction from the second-stage gas chamber to the first-stage gas chamber.

[0021] Embodiment 2: Based on Embodiment 1, the flue gas flow direction in the overall flue gas treatment system is described as follows: A heat exchange chamber is arranged at the middle position corresponding to the two partition plates 8 inside the assembly gas tank 1, and an intermediate partition plate 6 is installed at the middle position corresponding to the heat exchange chamber inside the assembly gas tank 1. The inside of the heat exchange chamber is divided into two convection chambers corresponding to the external flue gas inlet 3 by the intermediate partition plate 6. The outer diameter of the heat exchange water pipe 2 is smaller than the inner wall diameter of the independent flue pipe 7, and both ends of the heat exchange water pipe 2 are open. The first-stage gas chamber and the second-stage gas chamber are in communication through the independent flue pipe 7.

[0022] Scheme description: Taking Figure 4 and Figure 5 as examples, it is first necessary to ensure that the outer diameter of the heat exchange water pipe 2 is smaller than the inner wall diameter of the independent flue pipe 7 and the heat exchange water pipe 2 is located inside the independent flue pipe 7, so as to maintain the communication state between the first-stage gas chamber and the second-stage gas chamber by the independent flue pipe 7. During the indirect heat exchange process of the flue gas with the flue gas or low-temperature water in the convection chamber through the independent flue pipe 7, the two partition plates 8 are used to form two convection chambers. Regarding this, the convection chambers are described. The number of convection chambers set is directly related to the partition plate 6. Specifically, according to the process requirements, if the number of intermediate partition plates 6 set is one, then the number of convection chambers set is two. If the number of intermediate partition plates 6 set is two, then the number of convection chambers set is three, and each external flue gas inlet 3 only corresponds to an independent convection chamber. The purpose is to meet the requirements for heat recovery or flue gas heating of multiple groups of treatment equipment.

[0023] Embodiment 3: Combine Embodiment 2 into Embodiment 1 for the following supplementary description: A gas limiting part 701 is arranged on the independent smoke pipe 7. The cross-section of the gas limiting part 701 is frustum-shaped along the direction from the second-order air chamber to the first-order air chamber. A gas blocking block 703 is installed at the external position of the heat exchange water pipe 2 corresponding to the gas limiting part 701. The installation position of the gas limiting part 701 is close to the second-order air chamber. The setting direction of the external smoke port 3 is perpendicular to the setting direction of the independent smoke pipe 7. A thermocouple unit 702 is installed at the position of the independent smoke pipe 7 corresponding to the gas limiting part 701 close to the first-order air chamber. The water flow direction in the heat exchange water pipe 2 is opposite to the direction from the air inlet channel to the air outlet channel. An independent gas sleeve 9 corresponding to the heat exchange water pipe 2 is installed on the outer wall position of the assembly gas tank 1 corresponding to the second-order air chamber. The heat exchange water pipe 2 is slidably connected with the independent gas sleeve 9. A magnetic transmission structure 10 is arranged at the position of the heat exchange water pipe 2 corresponding to the inside of the independent gas sleeve 9.

[0024] Scheme description: Take Figure 5 as an example. The flow process of the flue gas in the independent smoke pipe 7 is restricted by the gas blocking block 703, and is specifically controlled by a control assembly arranged at the upper end position of the assembly gas tank 1, as follows: S1: First, number the assembly gas tanks 1 between every two adjacent treatment devices as i according to the flue gas treatment sequence. Then, according to the process requirements, limit the flue gas temperature requirement in the second-order air chamber of the assembly gas tank 1 numbered i. If it is required that the flue gas temperature in the second-order air chamber is higher than that in the first-order air chamber, then the flue gas flowing out of other treatment devices is needed. For example, if the flue gas temperature discharged from the second-order air chamber of the assembly gas tank 1 numbered i + n is higher than the flue gas temperature in the first-order air chamber of the assembly gas tank 1 numbered i, then the flue gas discharged from the second-order air chamber of the assembly gas tank 1 numbered i + n is injected into the convection chamber through the external smoke port 3, and the high-temperature flue gas is used to exchange heat with the flue gas in the first-order air chamber of the assembly gas tank 1 numbered i to raise its temperature; S2: Conversely, if it is required that the flue gas temperature in the second-order air chamber of the assembly gas tank 1 numbered i is lower than that in the first-order air chamber, then the flue gas in the first-order air chamber can be used as the temperature raising requirement of the assembly gas tank 1 numbered i + n. Specifically, it is manifested as follows: The flue gas entering the first-order air chamber of the assembly gas tank 1 numbered i will first enter the internal convection chamber of the assembly gas tank 1 numbered i + n through the external smoke port 3 of the assembly gas tank 1 numbered i + n to raise the temperature of the flue gas in the assembly gas tank 1 numbered i + n; S3: Combining the relevant descriptions in S1 and S2, the overall process is specifically determined according to the hazardous waste flue gas treatment process, and is not specifically limited in the present invention. It should be emphasized that: First, explain according to a single assembly gas tank 1. The control assembly 5 mainly consists of a controller and a temperature sensing structure. The temperature sensing structure mainly performs real-time temperature detection on the flue gas in the first-order air chamber, and a thermocouple unit 702 is arranged at the gas limiting part 701 to Figure 5For example, the thermocouple unit 702 is specifically arranged in the convection chamber, and it is ensured that it is arranged at a position close to the convection chamber in the air-limiting part 701. It is mainly used to detect in real time the flue gas temperature after the heat exchange process of the flue gas in the first-order gas chamber passing through the convection chamber, and the following supplementary description is made: S3-1: The heat exchange water pipe 2, as the flow structure of low-temperature water, will not interfere with the flue gas flow process. However, a gas-blocking block 703 is installed at the position corresponding to the air-limiting part 701. The flue gas temperature in the first-order gas chamber is set as T1, and the flue gas temperature in the second-order gas chamber is set as T2. According to the purification process requirements, the peak value T0 of the flue gas in the second-order gas chamber is ensured. If T1 is less than T0, heating treatment needs to be carried out through the external flue gas inlet 3. If T1 is greater than T0, the heat exchange water pipe 2 or the external flue gas inlet needs to be used for cooling treatment. The temperature value measured by the thermocouple unit 702 is set as TA. Since the first-order gas chamber and the second-order gas chamber are only connected through the independent flue pipe 7, if TA conforms to the peak value T0 of the flue gas, the magnetic drive structure 10 drives the gas-blocking block 703 to move reversely, so that the inside of the independent flue pipe 7 is connected. On the contrary, if TA does not conform to the peak value T0 of the flue gas, the inside of the independent flue pipe 7 is temporarily blocked by the gas-blocking block 703, ensuring that the flue gas cannot flow through the independent flue pipe 7 in a local position. A simple description of the magnetic drive structure 10 is as follows: Take Figure 5 as an example, it mainly consists of a permanent magnet block and an energized electromagnetic group. The permanent magnet block is installed at the internal position of the heat exchange water pipe 2 corresponding to the independent gas sleeve 9, and the energized electromagnetic group is installed at one end of the inner wall of the independent gas sleeve 9. Its essence is to utilize the attraction and repulsion in magnetism to realize the sliding process of the heat exchange water pipe 2.

[0025] In summary: The flue gas flow process in the hazardous waste flue gas treatment is improved. Taking the total gas tank as the main part, the total gas tank is used as the transfer structure of the flue gas in the treatment equipment. Taking the capillary combination in the total gas tank as the main part, the flue gas realizes the connection structure between the inlet and the outlet through the independent flue pipe. The flue gas flow process in the convection chamber can achieve the purpose of changing the flue gas temperature through the flue gas or low-temperature water. On this basis, for the overall flue gas treatment system, for each flue gas relative to the flow process in the total gas tank, the flue gas in a certain total gas tank is used as the temperature "supplementary source" of the flue gas in another total gas tank, realizing the dual functions of cooling and heating. And the independent flue pipe is further improved, and the gas-blocking block is used to limit the flow mode of the flue gas during heat exchange, maintaining the stable environment of the flue gas in the overall system.

[0026] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific embodiments. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A combined purification device for hazardous waste incineration flue gas based on waste heat recovery treatment, which is applied in a flue gas treatment system and uses an assembly gas tank (1), is characterized in that, A capillary combination is provided in the total assembly air box (1). The capillary combination includes a partition plate (8), independent smoke pipes (7), and a heat exchange water pipe (2). The independent smoke pipes (7) are arranged in a circular array along the center point of the partition plate (8), and the independent smoke pipes (7) are fixed in the partition plate (8) along the length direction of the total assembly air box (1). The heat exchange water pipe (2) is located inside the independent smoke pipes (7), and both ends of the heat exchange water pipe (2) penetrate to both sides of the total assembly air box (1). An air vent smoke port (4) and an external connection smoke port (3) are provided on the total assembly air box (1). A flue gas purification device, an external connection flue gas combination, and a water pump combination are respectively connected to both ends of the air vent smoke port (4), the external connection smoke port (3), and the heat exchange water pipe (2).

2. The waste incineration flue gas combined purification device based on waste heat recovery treatment according to claim 1, characterized in that, The air vent smoke port (4) includes an intake channel and an outlet channel. A first-order air chamber and a second-order air chamber corresponding to the intake channel and the outlet channel are respectively provided inside the total assembly air box (1) through the partition plate (8).

3. The combined purification device for hazardous waste incineration flue gas based on waste heat recovery treatment according to claim 2, wherein, A heat exchange chamber is provided at the middle position corresponding to the two partition plates (8) inside the total assembly air box (1), and an intermediate partition plate (6) is installed at the middle position corresponding to the heat exchange chamber inside the total assembly air box (1). The heat exchange chamber is divided into two convection chambers corresponding to the external connection smoke port (3) through the intermediate partition plate (6).

4. The waste incineration flue gas combined purification device based on waste heat recovery treatment according to claim 1, characterized in that, The outer diameter of the heat exchange water pipe (2) is smaller than the inner wall diameter of the independent smoke pipes (7), and both ends of the heat exchange water pipe (2) are open. The first-order air chamber and the second-order air chamber are in a communicating state through the independent smoke pipes (7).

5. The waste incineration flue gas combined purification device based on waste heat recovery treatment according to claim 1, characterized in that, A gas limiting part (701) is provided on the independent smoke pipes (7). The cross-section of the gas limiting part (701) is in the shape of a frustum of a cone along the direction from the second-order air chamber to the first-order air chamber. A gas blocking block (703) is installed at the external position of the heat exchange water pipe (2) corresponding to the gas limiting part (701).

6. The waste incineration flue gas combined purification device based on waste heat recovery treatment according to claim 5, wherein, The gas limiting part (701) is arranged close to the second-order air chamber. The installation direction of the external connection smoke port (3) is perpendicular to the installation direction of the independent smoke pipes (7). A thermocouple unit (702) is installed at the position of the independent smoke pipes (7) close to the first-order air chamber corresponding to the gas limiting part (701).

7. The waste incineration flue gas combined purification device based on waste heat recovery treatment according to claim 2, wherein The water flow direction in the heat exchange water pipe (2) is opposite to the direction from the intake channel to the outlet channel.

8. The waste incineration flue gas combined purification device based on waste heat recovery treatment according to claim 1, wherein, An independent air sleeve (9) corresponding to the heat exchange water pipe (2) is installed at the outer wall position of the total assembly air box (1) corresponding to the second-order air chamber. The heat exchange water pipe (2) is slidably connected to the independent air sleeve (9).

9. The waste incineration flue gas combined purification device based on waste heat recovery treatment according to claim 8, characterized in that, A magnetic transmission structure (10) is provided at the position of the heat exchange water pipe (2) inside the independent air sleeve (9).

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