Pre-cooling and dust-removing device for heat exchanger

Abstract

A pre-cooling and dust removal device for a heat exchanger belongs to the technical field of environmental protection and energy-saving facilities. It includes a dust collector with a liquid discharge hopper at the bottom and a perforated plate fixed inside the dust collector cavity. An exhaust port is located on the upper left side of the dust collector. A cooling tank, located inside the dust collector cavity, has an upper end cap, a lower end cap, and a set of cooling pipes fixed at intervals in the middle. An air inlet pipe is connected to the upper right side of the cooling tank, and air outlets communicating with the shell side are arranged at intervals around the lower part of the cooling tank. A liquid discharge tank is supported on the floor of the usage site or on a bracket installed on the floor, corresponding to the position below the liquid discharge hopper, and a discharge port is provided on the lower side of the liquid discharge tank. Advantages: Excellent cooling and purification effect; resource saving, reduced operating costs, and good environmental protection effect.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection and energy-saving facilities technology, specifically relating to a pre-cooling and dust removal device for a heat exchanger. Background Technology

[0002] The aforementioned pre-cooling and dust removal device for heat exchangers is primarily, but not exclusively, used in the steel industry, such as in metal pipe manufacturing enterprises. Taking metal pipe manufacturing enterprises as an example, in the production of seamless steel pipes, the DX furnace is a type of heat treatment furnace equipped with or integrated with a DX gas generator. Its core function is to provide an oxidation-free protective environment for the heat treatment of steel pipes, preventing surface oxidation due to contact with air at high temperatures, thereby obtaining high-quality products. More specifically, the DX furnace isolates the steel pipes from oxygen by filling the furnace chamber with DX gas (a weakly reducing protective atmosphere), ensuring that the steel pipes exiting the furnace have a bright surface without an oxide film. The aforementioned DX gas is a mixture of nitrogen (N2), hydrogen (H2), carbon monoxide (CO), and carbon dioxide (CO2) generated from natural gas such as methane or propane through incomplete combustion with air at high temperatures. The DX furnace system consists of: a mixed gas being introduced into a sealed furnace chamber to isolate oxygen; airflow circulating within the furnace and being extracted from the furnace chamber; pre-cooling and dust removal; a heat exchanger recovering waste heat to preheat the combustion air; purification / drying; and a circulating fan returning the gas to the furnace chamber. Thus, the entire system constitutes a closed-loop gas circulation system centered on the heat treatment furnace. Simply put, the process involves: use within the furnace, extraction for cooling and dust removal, purification and recovery, and return to the furnace for reuse.

[0003] As mentioned above, a pre-cooling and dust removal device for the heat exchanger is an indispensable supporting facility for the DX furnace. However, existing technologies often discharge the gas from the DX furnace to the outside environment, which not only impacts the environment but also wastes energy and is not conducive to resource conservation, contradicting the current societal advocacy of a conservation-oriented and energy-saving economy. Furthermore, the need for continuous fresh gas production leads to high operating costs.

[0004] With the increasing awareness of environmental protection, energy conservation, and the need to reduce production costs in a reasonable and effective manner, it is of positive significance to explore pre-cooling and dust removal devices such as the aforementioned heat exchangers that can be matched with DX furnaces. The technical solution to be introduced below is generated in this context. Utility Model Content

[0005] The objective of this invention is to provide a pre-cooling and dust removal device for a heat exchanger that effectively cools and removes dust from the gas exiting a DX furnace, thereby achieving excellent cooling and purification effects, protecting the environment, saving resources by returning the cooled and purified DX gas to the DX furnace, and reducing the operating costs of the DX furnace.

[0006] The present invention achieves its objective as follows: a pre-cooling and dust removal device for a heat exchanger includes a dust collection box, which is supported on the ground by a set of support legs or on a bracket set on the ground during use. A liquid discharge hopper communicating with the dust collection box cavity is connected to the bottom of the dust collection box. A perforated plate is fixed inside the dust collection box cavity at its lower part, and an exhaust port is provided on the upper left side of the dust collection box. A cooling tank is located inside the dust collection box cavity, with an upper end cap at the top and a lower end cap at the bottom. A longitudinally fixed component is positioned between the upper and lower end caps in the middle of the cooling tank at intervals. A set of cooling pipes, the upper end cap protruding from the top of the dust collector and connected to the coolant supply pipe, the bottom of the lower end cap extending from the lower end cap outlet to below the perforated plate and communicating with the liquid discharge hopper, an air inlet pipe connected to the upper right side of the cooling tank, the air inlet pipe communicating with the shell side formed between the outer wall of the set of cooling pipes and the inner wall of the cooling tank, and air outlets communicating with the shell side are arranged at intervals around the lower part of the cooling tank; a liquid discharge tank, the liquid discharge tank being supported on the floor of the usage site or on a bracket set on the floor at a position corresponding to below the liquid discharge hopper, and a discharge port is provided on the lower side of the liquid discharge tank.

[0007] In a specific embodiment of this utility model, dust collector baffles are provided at intervals on each inner wall of the dust collector and along the height direction of the inner wall of the dust collector, and cooling tank baffles are provided at intervals around the outer wall of the cooling tank and along the height direction of the cooling tank.

[0008] In another specific embodiment of this utility model, the dust collector baffle and the cooling tank baffle are arranged in an interlocking position.

[0009] In another specific embodiment of this utility model, the dust collector baffle is inclined downward toward the cooling tank, while the cooling tank baffle is inclined downward toward the inner wall of the dust collector.

[0010] In another specific embodiment of this utility model, dust exhaust holes are densely arranged on the perforated plate.

[0011] In another specific embodiment of this utility model, a liquid discharge hopper opening and closing valve is provided on the liquid discharge hopper and at the upper open position of the liquid tank. The liquid discharge hopper opening and closing valve is connected to an opening and closing valve actuator, which is fixed on the outer wall of the liquid discharge hopper and electrically connected to an electrical controller in use.

[0012] In a further specific embodiment of this utility model, the liquid discharge hopper opening and closing valve is a butterfly valve, and the opening and closing valve actuator is a pneumatic actuator.

[0013] In a further specific embodiment of this utility model, the coolant supply pipe is connected to the outlet of the coolant circulation supply device in use, and the coolant circulation supply device is a circulation pump, the inlet of which is connected to the collection tank via a pipeline; the coolant is water.

[0014] In yet another specific embodiment of this utility model, the upper end cap interface of the upper end cap is connected to the upper end cap cavity of the upper end cap, and the upper end cap cavity is connected to the tube side of the set of cooling pipes. The lower end cap outlet of the lower end cap is connected to the lower end cap cavity of the lower end cap, and the lower end cap cavity is also connected to the tube side.

[0015] In another specific embodiment of this utility model, the gas introduced by the air inlet pipe is the exhaust gas discharged from the DX furnace, and the air extraction port is connected to the air extraction device through a pipeline in the use state. The air extraction device is a fan or an air pump; there are four air outlets, which are distributed at equal intervals around the cooling tank.

[0016] The technical advantages of this invention are as follows: Waste gas from the DX furnace is introduced into the shell side via the inlet pipe, cooled by a set of cooling pipes, and then exits the shell side through the outlet and is extracted through the extraction port for reuse in the DX furnace. Under the action of the dust collector baffle and the cooling tank baffle, the airflow of the dust-containing DX gas exiting the outlet is forced to suddenly change direction, generating violent turbulence and impact, separating the dust from the gas. Under gravity, the dust enters the liquid sludge tank below through the perforated plate and liquid sludge outlet hopper, and is discharged into the collection pool, ensuring the cleanliness of the reused DX gas and demonstrating excellent cooling and purification effects. Because the cooled and purified DX gas can be returned to the DX furnace for use, resources are saved, and it is easier to reduce the operating cost of the DX furnace and demonstrate good environmental protection effects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of the present utility model; Figure 2 for Figure 1 AA sectional view.

[0018] In the diagram: 1. Dust collector, 11. Support leg, 12. Dust collector cavity, 13. Liquid discharge hopper, 131. Liquid discharge hopper on / off valve, 1311. On / off valve actuator, 14. Perforated plate, 141. Dust discharge hole, 15. Air extraction port, 16. Dust collector baffle, 17. Transition space; 2. Cooling tank, 21. Upper head, 211. Upper head interface, 212. Upper head cavity, 22. Lower head, 221. Lower head liquid outlet, 222. Lower head cavity, 23. Cooling pipe, 231. Tube side, 24. Air inlet pipe, 25. Shell side, 26. Air outlet, 27. Cooling tank baffle; 3. Liquid discharge tank, 31. Discharge port. Detailed Implementation

[0019] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0020] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on the current position. Figure 1 The position shown is a baseline and therefore should not be construed as a specific limitation on the technical solution provided by this utility model.

[0021] Please see Figure 1The diagram shows a dust collector 1, which is supported on the ground by a set of support legs 11 or on a bracket set on the ground (the former is chosen in this embodiment). A liquid discharge hopper 13 communicating with the dust collector cavity 12 is attached to the bottom of the dust collector 1. A perforated plate 14 is fixed inside the dust collector cavity 12 and at its lower part. An exhaust port 15 is provided on the upper left side of the dust collector 1. A cooling tank 2 is shown, located inside the dust collector cavity 12. The upper part of the cooling tank 2 has an upper end cap 21, and the lower part has a lower end cap 22. A set of cooling pipes 23 (also called "tubes") is longitudinally fixed at intervals in the middle of the cooling tank 2, between the upper and lower end caps 21 and 22. The aforementioned upper end cap... 21. The upper end cap interface 211 protrudes from the top of the aforementioned dust collection box 1 and connects to the coolant supply pipe. The bottom of the aforementioned lower end cap 22 extends from the lower end cap outlet 221 to the bottom of the aforementioned hollow plate 4 and communicates with the liquid discharge hopper 13. An air inlet pipe 24 is connected to the upper right side of the cooling tank 2. The air inlet pipe 24 communicates with the shell side 25 formed between the outer wall of a set of cooling pipes 23 and the inner wall of the cooling tank 2. Air outlets 26 communicating with the aforementioned shell side 25 are provided at intervals around the lower part of the cooling tank 2. A liquid discharge tank 3 is shown. The liquid discharge tank 3 is supported on the floor of the place of use or on a bracket set on the floor at a position corresponding to the lower part of the aforementioned liquid discharge hopper 13 (the former is selected in this embodiment). A discharge port 31 is provided on the lower side of the liquid discharge tank 3.

[0022] Dust collector baffles 16 are provided at intervals on the inner walls of the aforementioned dust collector 1 along the height direction of the inner walls of the dust collector 1, and cooling tank baffles 27 are provided at intervals around the outer walls of the aforementioned cooling tank 2 along the height direction of the cooling tank 2.

[0023] The aforementioned dust collector baffle 16 and the aforementioned cooling tank baffle 27 are positioned in an interlocking manner, with the dust collector baffle 16 inclined downwards towards the aforementioned cooling tank 2, while the aforementioned cooling tank baffle 27 is inclined downwards towards the inner wall of the aforementioned dust collector 1. This structural design fully reflects the corresponding technical effects described by the applicant in the above-mentioned technical effects section.

[0024] Depend on Figure 1 As shown, dust discharge holes 141 are densely arranged on the aforementioned perforated plate 14; a liquid discharge hopper opening and closing valve 131 is provided on the aforementioned liquid discharge hopper 13 and at the upper open position of the aforementioned liquid tank 3. The liquid discharge hopper opening and closing valve 131 is connected to the opening and closing valve actuator 1311. The opening and closing valve actuator 1311 is fixed on the outer wall of the liquid discharge hopper 13 and is electrically connected to the electrical controller in the use state.

[0025] See you later Figure 1 In this embodiment, the aforementioned liquid discharge hopper opening and closing valve 131 is a butterfly valve, and the aforementioned opening and closing valve actuator 1311 is a pneumatic actuator.

[0026] The aforementioned coolant supply pipe is connected to the outlet of the coolant circulation supply device when in use. The coolant circulation supply device is a circulation pump, and the inlet of the circulation pump is connected to the collection tank (also known as a "sedimentation tank") via a pipeline. In this embodiment, the aforementioned coolant is water.

[0027] The upper end cap interface 211 of the aforementioned upper end cap 21 is connected to the upper end cap cavity 212 of the upper end cap 21, and the upper end cap cavity 212 is connected to the tube side 231 of the aforementioned set of cooling pipes 23. The lower end cap outlet 221 of the aforementioned lower end cap 22 is connected to the lower end cap cavity 222 of the lower end cap 22, and the lower end cap cavity 222 is also connected to the aforementioned tube side 231.

[0028] In this embodiment, the gas introduced by the aforementioned air inlet pipe 24 is the exhaust gas discharged from the DX furnace. The aforementioned air extraction port 15 is connected to the air extraction device through a pipeline in the use state. In this embodiment, the aforementioned air extraction device is a fan, but an air pump can also be used.

[0029] Please see Figure 2 And combined Figure 1 There are four air outlets 26, which are distributed at equal intervals around the cooling tank 2.

[0030] The applicant describes the use of this utility model as follows: With the operation of a fan on the pipeline connected to the exhaust port 15, a negative pressure is generated in the dust collector chamber 12. The exhaust gas generated in the DX furnace is introduced into the shell side 25 via the intake pipe 24 and the pipeline. Simultaneously, water (i.e., cooling water) is introduced as a coolant through the upper end cap interface 211. The cooling water sequentially passes through the upper end cap chamber 212, the tube side 231 of a set of cooling pipes 23, the lower end cap chamber 222, the lower end cap outlet 221, the liquid discharge hopper 13, and the liquid tank 3 (when the liquid discharge hopper opening / closing valve 131 is opened). During the aforementioned process, the dust-laden DX gas entering the shell side 25 is cooled, and the dust-laden DX gas, under the combined action of the dust collector baffle 16 and the cooling tank baffle 27, separates the dust, which then sequentially passes through the dust discharge hole 141, the transition space 17 of the dust settling box 1 located below the perforated plate 14, the liquid discharge hopper 13, and finally enters the liquid tank 3. The DX air from the cooling and dust removal box is drawn out through the exhaust port 15 and returned to the DX furnace.

[0031] An on / off valve is preferably installed on the discharge port 31 of the aforementioned liquid tank 3. The water containing sewage discharged from the discharge port 31 is introduced into a separate collection tank (also known as a "sedimentation tank") mentioned above through a pipeline. The water in the upper part of the collection tank can be returned to the upper end cap interface 211 by a circulation pump, and the sludge at the bottom of the collection tank is removed periodically or irregularly.

[0032] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A pre-cooling and dust removal device for a heat exchanger, characterized in that: The system includes a dust collector (1), which is supported on the ground by a set of support legs (11) or on a bracket set on the ground when in use. A liquid discharge hopper (13) communicating with the dust collector cavity (12) of the dust collector (1) is connected to the bottom of the dust collector (1). A perforated plate (14) is fixed in the lower part of the dust collector cavity (12). An exhaust port (15) is provided on the upper left side of the dust collector (1). A cooling tank (2) is located in the dust collector cavity (12). The upper part of the cooling tank (2) is formed by an upper end cap (21), and the lower part is formed by a lower end cap (22). A set of cooling pipes (23) is longitudinally fixed in the middle of the cooling tank (2) between the upper and lower end caps (21, 22) at intervals. The upper end cap (21) is formed by an upper end cap. The head interface (211) protrudes from the top of the dust collector (1) and is connected to the coolant supply pipe. The bottom of the lower end cap (22) extends from the liquid outlet (221) of the lower end cap to the bottom of the hollow plate (14) and communicates with the liquid drain hopper (13). An air inlet pipe (24) is connected to the upper right side of the cooling tank (2). The air inlet pipe (24) communicates with the shell side (25) between the outer wall of a set of cooling pipes (23) and the inner wall of the cooling tank (2). An air outlet (26) communicating with the shell side (25) is provided at intervals around the lower part of the cooling tank (2). A liquid drain tank (3) is supported on the floor of the place of use or on a bracket set on the floor at a position corresponding to the lower part of the liquid drain hopper (13). A discharge port (31) is provided on the lower side of the liquid drain tank (3).

2. The pre-cooling and dust removal device for the heat exchanger according to claim 1, characterized in that: Dust collector baffles (16) are provided at intervals on each inner wall of the dust collector (1) and along the height direction of the inner wall of the dust collector (1). Cooling tank baffles (27) are provided at intervals on the outer wall of the cooling tank (2) and around the cooling tank (2) along the height direction of the cooling tank (2).

3. The pre-cooling and dust removal device for the heat exchanger according to claim 2, characterized in that: The dust collector baffle (16) and the cooling tank baffle (27) are in an interlocking position.

4. The pre-cooling and dust removal device for the heat exchanger according to claim 2 or 3, characterized in that: The dust collector baffle (16) is inclined downward toward the cooling tank (2), while the cooling tank baffle (27) is inclined downward toward the inner wall of the dust collector (1).

5. The pre-cooling and dust removal device for the heat exchanger according to claim 1, characterized in that: Dust vents (141) are densely arranged on the perforated plate (14).

6. The pre-cooling and dust removal device for the heat exchanger according to claim 1, characterized in that: A liquid discharge hopper opening and closing valve (131) is provided on the liquid discharge hopper (13) and at the upper opening of the liquid tank (3). The liquid discharge hopper opening and closing valve (131) is connected to the opening and closing valve actuator (1311). The opening and closing valve actuator (1311) is fixed on the outer wall of the liquid discharge hopper (13) and is electrically connected to the electrical controller in the use state.

7. The pre-cooling and dust removal device for the heat exchanger according to claim 6, characterized in that: The liquid discharge hopper opening and closing valve (131) is a butterfly valve, and the opening and closing valve actuator (1311) is a pneumatic actuator.

8. The pre-cooling and dust removal device for the heat exchanger according to claim 1, characterized in that: The coolant supply pipe is connected to the outlet of the coolant circulation supply device when in use. The coolant circulation supply device is a circulation pump, and the inlet of the circulation pump is connected to the collection tank via a pipeline. The coolant is water.

9. The pre-cooling and dust removal device for the heat exchanger according to claim 1, characterized in that: The upper end cap interface (211) of the upper end cap (21) is connected to the upper end cap cavity (212) of the upper end cap (21), and the upper end cap cavity (212) is connected to the tube side (231) of the set of cooling tubes (23). The lower end cap outlet (221) of the lower end cap (22) is connected to the lower end cap cavity (222) of the lower end cap (22), and the lower end cap cavity (222) is also connected to the tube side (231).

10. The pre-cooling and dust removal device for the heat exchanger according to claim 1, characterized in that: The gas introduced by the inlet pipe (24) is the exhaust gas discharged from the DX furnace. The exhaust port (15) is connected to the exhaust device through a pipeline when in use. The exhaust device is a fan or an exhaust pump. There are four exhaust ports (26) and they are distributed at equal intervals around the cooling tank (2).

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