Formaldehyde synthesis tail gas waste heat recycling device

Abstract

The utility model provides a kind of tail gas waste heat recycling device of formaldehyde synthesis, including base, the right side fixed mounting of base top has combustion box, the inside fixed mounting of combustion box has heat return pipe, heat return pipe top is penetrated combustion box and extends to the top of combustion box, the inside of combustion box and located below heat return pipe is provided with second annular nozzle, the top of base and located left side of combustion box is provided with waste heat recovery mechanism, waste heat recovery mechanism includes the first heat exchange box of fixed installation in the left side of base top and the second heat exchange box of fixed installation in the right side of first heat exchange box and located in the top of base.The utility model in combustion box is combusted to the tail gas of formaldehyde after removal, heat return pipe is contained to water, and then the heat generated by tail gas combustion is recycled, waste heat recovery mechanism is recycled to the tail gas generated by formaldehyde reaction, avoid the problem of heat waste caused by direct emission.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery and utilization technology, specifically to a waste heat recovery and utilization device for formaldehyde synthesis exhaust gas. Background Technology

[0002] The formaldehyde synthesis process produces exhaust gas containing formaldehyde. Direct emission of this exhaust gas not only wastes a great deal of heat but also causes pollution problems due to its formaldehyde content.

[0003] Traditional exhaust gas treatment methods often struggle to efficiently recover heat and are ineffective at removing formaldehyde from exhaust gases, failing to meet both environmental protection and energy conservation requirements.

[0004] To address this issue, a waste heat recovery and utilization device for formaldehyde synthesis exhaust gas is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat recovery and utilization device for formaldehyde synthesis exhaust gas, so as to solve the technical problems of existing exhaust gas treatments that are difficult to efficiently recover heat and have poor formaldehyde removal effects.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A waste heat recovery and utilization device for formaldehyde synthesis exhaust gas includes a base, a combustion chamber is fixedly installed on the right side of the top of the base, a heat return pipe is fixedly installed inside the combustion chamber, the top of the heat return pipe passes through the combustion chamber and extends to the top of the combustion chamber, a second annular nozzle is provided inside the combustion chamber and below the heat return pipe, and a waste heat recovery mechanism is provided on the top of the base and on the left side of the combustion chamber.

[0008] The waste heat recovery mechanism includes a first heat exchange box fixedly installed on the left side of the top of the base and a second heat exchange box fixedly installed on the top of the base and located to the right of the first heat exchange box. Both the first and second heat exchange boxes have heat exchangers fixedly installed inside. The bottom of the heat exchanger inside the first heat exchange box is connected to a first water pipe, and the end of the first water pipe is connected to the top of the heat exchanger inside the second heat exchange box. The bottom of the heat exchanger inside the second heat exchange box is connected to a water supply port, which passes through the second heat exchange box and extends to the bottom of the second heat exchange box.

[0009] As a preferred embodiment of this utility model, the bottom of the first heat exchange box is connected to an air supply interface, the top of the first heat exchange box is connected to a first air guide pipe, and the end of the first air guide pipe extends into the interior of the second heat exchange box and is located below the heat exchanger inside the second heat exchange box and connected to a first annular nozzle.

[0010] As a preferred embodiment of this utility model, a water inlet is connected to the rear side of the top of the second heat exchange box, and a water return outlet is connected to the bottom of the second heat exchange box.

[0011] As a preferred embodiment of this utility model, the top of the heat exchanger inside the first heat exchange box is connected to a second water pipe, and the end of the second water pipe is connected to the top of the heat return pipe.

[0012] As a preferred embodiment of this utility model, a second air guide pipe is connected to the front side of the top of the second heat exchange box, and the end of the second air guide pipe extends into the interior of the combustion box and is connected to the second annular nozzle.

[0013] As a preferred embodiment of this utility model, the bottom of the heat return pipe is connected to a water outlet, which extends to the bottom of the combustion chamber, and the right side of the top of the combustion chamber is connected to an exhaust pipe.

[0014] As a preferred embodiment of this utility model, an igniter is fixedly installed on the left side of the bottom of the combustion chamber, and a blower is connected to the right side of the bottom of the combustion chamber.

[0015] Compared with existing technologies, the waste heat recovery and utilization device for formaldehyde synthesis exhaust gas provided by this utility model has the following beneficial effects:

[0016] 1. High-efficiency heat recovery: Through the heat exchangers in the first and second heat exchange boxes and the heat return pipe in the combustion box, multi-stage heat recovery of exhaust gas is achieved, which greatly improves the heat recovery rate and reduces heat waste.

[0017] 2. Effective removal of formaldehyde: By fully mixing the formaldehyde absorption liquid in the second heat exchange box with the exhaust gas sprayed from the first annular nozzle, the formaldehyde in the exhaust gas can be effectively eliminated, reducing emission pollution.

[0018] 3. Improve energy efficiency: The recovered heat can be used to heat water, which can then be applied to other production processes, thus realizing the recycling of energy and improving the overall energy efficiency of production.

[0019] 4. Reasonable structure: The arrangement of various components, such as the first annular nozzle and the second annular nozzle, ensures uniform mixing of exhaust gas and absorbent liquid, and gas and oxygen, thereby improving heat exchange efficiency and combustion effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the waste heat recovery mechanism in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the combustion chamber in an embodiment of the present invention.

[0025] Reference numerals: 1. Base; 2. Combustion chamber; 3. Waste heat recovery mechanism; 301. First heat exchanger; 302. Second heat exchanger; 303. First water pipe; 304. Second water pipe; 305. Gas supply interface; 306. First air pipe; 307. Second air pipe; 308. Water inlet; 309. Water return outlet; 310. Water supply outlet; 311. Heat exchanger; 312. First annular nozzle; 4. Exhaust pipe; 5. Blower; 6. Water outlet; 7. Igniter; 8. Heat return pipe; 9. Second annular nozzle. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0027] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0029] See Figures 1-4As shown in the figure, an embodiment of the present invention discloses a waste heat recovery device for formaldehyde synthesis exhaust gas, including a base 1. A combustion chamber 2 is fixedly installed on the right side of the top of the base 1. A heat return pipe 8 is fixedly installed inside the combustion chamber 2. The top of the heat return pipe 8 passes through the combustion chamber 2 and extends to the top of the combustion chamber 2. A second annular nozzle 9 is arranged inside the combustion chamber 2 and below the heat return pipe 8. A waste heat recovery mechanism 3 is arranged on the top of the base 1 and on the left side of the combustion chamber 2. The combustion chamber 2 is used to burn the exhaust gas after formaldehyde removal. The heat return pipe 8 is used to contain water, thereby recovering the heat generated by the combustion of the exhaust gas. The waste heat recovery mechanism 3 is used to recover the exhaust gas generated by the formaldehyde reaction, avoiding the problem of heat waste caused by direct emission.

[0030] The waste heat recovery mechanism 3 includes a first heat exchange box 301 fixedly installed on the left side of the top of the base 1 and a second heat exchange box 302 fixedly installed on the top of the base 1 and located to the right of the first heat exchange box 301. Both the first and second heat exchange boxes 301 and 302 have heat exchangers 311 fixedly installed inside. The bottom of the heat exchanger 311 inside the first heat exchange box 301 is connected to a first water pipe 303, and the end of the first water pipe 303 is connected to the top of the heat exchanger 311 inside the second heat exchange box 302. The bottom of the heat exchanger 311 inside the second heat exchange box 302 is connected to a water supply port 310. The water supply port 310 passes through the second heat exchange box 302 and extends to the bottom of the second heat exchange box 302. The first heat exchange box 301 and the heat exchanger 311 are used to exchange heat with the exhaust gas generated in the production process. The first heat exchange box 301 and the heat exchanger 311 are used to transfer heat to the water in which formaldehyde is dissolved during the water dissolution process, and then exchange heat with the water again, further removing heat and increasing the heat recovery rate.

[0031] The bottom of the first heat exchange box 301 is connected to a gas supply port 305, and the top of the first heat exchange box 301 is connected to a first gas guide pipe 306. The end of the first gas guide pipe 306 extends into the interior of the second heat exchange box 302 and is located below the heat exchanger 311 inside the second heat exchange box 302, connected to a first annular nozzle 312. The gas supply port 305 is connected to the pipe discharged from formaldehyde production. The first gas guide pipe 306 sends the exhaust gas after gas heat exchange inside the first heat exchange box 301 to the interior of the second heat exchange box 302. The first annular nozzle 312 evenly sprays the exhaust gas after preliminary heat exchange into the interior of the second heat exchange box 302 to mix with the formaldehyde absorption liquid and thus eliminate the formaldehyde in the exhaust gas.

[0032] The rear side of the top of the second heat exchange box 302 is connected to a water inlet 308, and the bottom of the second heat exchange box 302 is connected to a water return outlet 309. The water inlet 308 is used to inject formaldehyde absorption liquid into the interior of the second heat exchange box 302, and the water return outlet 309 discharges the formaldehyde-absorbing absorption liquid to remove formaldehyde from the exhaust gas.

[0033] The top of the heat exchanger 311 inside the first heat exchange box 301 is connected to the second water pipe 304. The end of the second water pipe 304 is connected to the top of the heat return pipe 8. The second water pipe 304 sends the water from the two heat exchanges to the inside of the heat return pipe 8 for further heating and absorption of the heat from the exhaust gas combustion.

[0034] The front side of the top of the second heat exchange box 302 is connected to the second air guide pipe 307. The end of the second air guide pipe 307 extends into the interior of the combustion box 2 and is connected to the second annular nozzle 9. The second air guide pipe 307 sends the exhaust gas that removes formaldehyde into the interior of the combustion box 2 for combustion of combustibles.

[0035] The bottom of the heat return pipe 8 is connected to the water outlet 6, which extends to the bottom of the combustion chamber 2. The right side of the top of the combustion chamber 2 is connected to the exhaust pipe 4. The water outlet 6 is connected to the conduit to discharge the water that has absorbed heat, and the exhaust pipe 4 discharges the exhaust gas after combustion.

[0036] An igniter 7 is fixedly installed on the left side of the bottom of the combustion chamber 2, and a blower 5 is connected to the right side of the bottom of the combustion chamber 2. The igniter 7 is used to ignite the gas inside the combustion chamber 2, and the blower 5 sends outside air into the interior to provide oxygen for the combustible gas to facilitate combustion.

[0037] This embodiment of the invention achieves waste heat recovery and formaldehyde removal from exhaust gas through a combination of multi-stage heat exchange and combustion treatment. The exhaust gas emitted from formaldehyde production enters the first heat exchange box 301 via the gas supply interface 305, where it exchanges heat with the internal heat exchanger 311, transferring some heat to the water within the heat exchanger 311. After preliminary heat exchange, the exhaust gas is sent through the first air guide pipe 306 to the first annular spray pipe 312 within the second heat exchange box 302, where it is evenly sprayed and mixed with the formaldehyde absorbent liquid injected through the water inlet 308. This process eliminates formaldehyde from the exhaust gas while transferring heat to the absorbent liquid, which then exchanges heat with the heat exchanger 311 within the second heat exchange box 302, further heating the water within the heat exchanger 311. The water in the heat exchanger 311 circulates between the two boxes via the first water guide pipe 303, continuously absorbing heat.

[0038] The exhaust gas, after formaldehyde removal treatment, enters the second annular nozzle 9 inside the combustion chamber 2 through the second air guide pipe 307 and is evenly sprayed into the combustion chamber 2. At the same time, the blower 5 sends in oxygen, which is ignited by the igniter 7 and then burned. The heat generated by the combustion heats the water in the heat return pipe 8, and finally the hot water is discharged from the outlet 6. The exhaust gas after combustion is discharged through the exhaust pipe 4.

[0039] How to use:

[0040] 1. Connect the relevant pipes: Connect the pipe from formaldehyde production to the gas supply interface 305, the water supply pipe to the water supply port 310, the hot water pipe to the water outlet 6, and the supply and return pipes of the formaldehyde absorption liquid to the water inlet 308 and the return port 309, respectively.

[0041] 2. Start-up device: Water is sent into the heat exchanger 311 in the second heat exchange box 302 through the water supply port 310. The water enters the heat exchanger 311 in the first heat exchange box 301 through the first water guide pipe 303, and finally is sent to the heat return pipe 8 through the second water guide pipe 304.

[0042] 3. Exhaust gas treatment and heat exchange: The exhaust gas undergoes two heat exchanges in the first heat exchange box 301 and the second heat exchange box 302 in sequence, while formaldehyde is removed in the second heat exchange box 302.

[0043] 4. Combustion heating: The exhaust gas after formaldehyde removal enters the combustion chamber 2 for combustion, which heats the water in the heat return pipe 8. The exhaust gas after combustion is discharged through the exhaust pipe 4, the hot water is discharged through the outlet 6, and the absorbent liquid that has absorbed formaldehyde is discharged through the return water outlet 309.

[0044] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for recovering and utilizing waste heat from formaldehyde synthesis exhaust gas, characterized in that: Includes a base (1), a combustion chamber (2) is fixedly installed on the right side of the top of the base (1), a heat return pipe (8) is fixedly installed inside the combustion chamber (2), the top of the heat return pipe (8) passes through the combustion chamber (2) and extends to the top of the combustion chamber (2), a second annular nozzle (9) is provided inside the combustion chamber (2) and below the heat return pipe (8), and a waste heat recovery mechanism (3) is provided on the top of the base (1) and on the left side of the combustion chamber (2). The waste heat recovery mechanism (3) includes a first heat exchange box (301) fixedly installed on the left side of the top of the base (1) and a second heat exchange box (302) fixedly installed on the top of the base (1) and located on the right side of the first heat exchange box (301). Both the first heat exchange box (301) and the second heat exchange box (302) are fixedly installed with heat exchangers (311). The bottom of the heat exchanger (311) inside the first heat exchange box (301) is connected to a first water pipe (303). The end of the first water pipe (303) is connected to the top of the heat exchanger (311) inside the second heat exchange box (302). The bottom of the heat exchanger (311) inside the second heat exchange box (302) is connected to a water inlet (310). The water inlet (310) passes through the second heat exchange box (302) and extends to the bottom of the second heat exchange box (302).

2. The waste heat recovery and utilization device for formaldehyde synthesis tail gas according to claim 1, characterized in that: The bottom of the first heat exchange box (301) is connected to an air supply port (305), the top of the first heat exchange box (301) is connected to a first air guide pipe (306), and the end of the first air guide pipe (306) extends into the interior of the second heat exchange box (302) and is connected to a first annular nozzle (312) below the heat exchanger (311) inside the second heat exchange box (302).

3. The waste heat recovery and utilization device for formaldehyde synthesis tail gas according to claim 1, characterized in that: The second heat exchange box (302) has a water inlet (308) connected to the rear side of the top and a water return outlet (309) connected to the bottom.

4. The waste heat recovery and utilization device for formaldehyde synthesis tail gas according to claim 1, characterized in that: The top of the heat exchanger (311) inside the first heat exchange box (301) is connected to a second water pipe (304), and the end of the second water pipe (304) is connected to the top of the heat return pipe (8).

5. The waste heat recovery and utilization device for formaldehyde synthesis tail gas according to claim 1, characterized in that: The front side of the top of the second heat exchange box (302) is connected to a second air guide pipe (307), and the end of the second air guide pipe (307) extends into the interior of the combustion box (2) and is connected to the second annular nozzle (9).

6. The waste heat recovery and utilization device for formaldehyde synthesis tail gas according to claim 1, characterized in that: The bottom of the heat return pipe (8) is connected to a water outlet (6), which extends to the bottom of the combustion chamber (2). The right side of the top of the combustion chamber (2) is connected to an exhaust pipe (4).

7. The waste heat recovery and utilization device for formaldehyde synthesis tail gas according to any one of claims 1-6, characterized in that: An igniter (7) is fixedly installed on the left side of the bottom of the combustion chamber (2), and a blower (5) is connected to the right side of the bottom of the combustion chamber (2).

Images