A cascade heat recovery heat exchanger for converter industrial waste gas

Abstract

The utility model discloses a kind of for converter industrial smoke waste gas's cascade waste heat recovery heat exchanger, belong to waste heat recovery technical field, a kind of for converter industrial smoke waste gas's cascade waste heat recovery heat exchanger, including heat exchange box, with the heat exchange box lead-through connection's desulfurizing tower and install the heat recovery tower above the desulfurizing tower, the front end of the heat exchange box is equipped with air inlet, the inside of the heat exchange box is equipped with the finned tube of continuous S shape structure arrangement, and both ends of the finned tube are extended to the outside of the heat exchange box, lead-through connection has the communicating pipe between the desulfurizing tower with the heat recovery tower, the lateral wall root of the heat recovery tower is lead-through connection with hot water outlet pipe, the inner chamber of the heat recovery tower is installed with first shower head, and the first shower head longitudinal equidistance is provided with multiple, it can maximumly recover the heat in flue gas by ladder type heat energy recovery, reduce the waste of heat.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and more specifically, to a cascade waste heat recovery heat exchanger for converter industrial flue gas. Background Technology

[0002] Converter flue gas is a mixture of furnace gas and dust discharged during the converter blowing process. Its main components are carbon monoxide (86%), carbon dioxide (10%), and trace gases. The temperature reaches 1400-1600℃, and the dust content is 80-150 g / m³. 3 It is characterized by high temperature, toxicity, flammability, and explosiveness. Its collection methods are divided into combustion and non-combustion methods: the combustion method utilizes waste heat to generate electricity; the non-combustion method uses a movable fume hood to isolate the air, recovers the flue gas, and then purifies it. Mainstream technologies include the OG method and the LT method.

[0003] Existing methods for recovering heat from converter flue gas mainly employ spray heat recovery, which results in a low heat recovery rate. To maximize the recovery of heat from the flue gas, we propose a cascade waste heat recovery heat exchanger for converter industrial flue gas to address the aforementioned problems. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a stepped waste heat recovery heat exchanger for converter industrial flue gas. It can recover heat from the flue gas to the maximum extent through stepped heat energy recovery, thereby reducing heat waste.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A cascade waste heat recovery heat exchanger for converter industrial flue gas includes a heat exchange box, a desulfurization tower connected in communication with the heat exchange box, and a heat recovery tower installed above the desulfurization tower. The front end of the heat exchange box is provided with an air inlet, and the inner side of the heat exchange box is equipped with finned tubes arranged in a continuous S-shaped structure, with both ends of the finned tubes extending to the outer side of the heat exchange box.

[0009] A connecting pipe is provided between the desulfurization tower and the heat recovery tower;

[0010] A hot water outlet pipe is connected to the root of the side wall of the heat recovery tower. A first spray head is installed in the inner cavity of the heat recovery tower, and multiple first spray heads are arranged longitudinally at equal intervals. A filter grid is installed below the first spray head. A first booster pump is installed on the outside of the heat recovery tower, and a connecting pipe connected to the first spray head is installed at the output end of the first booster pump.

[0011] Furthermore, a water supply pipe that is electrically connected to the connecting pipe is fixedly connected to the top of the heat exchange box;

[0012] The top of the inner cavity of the heat exchange box is equipped with a main pipe that is connected to the water supply pipe. A branch pipe is connected to the main pipe, and multiple branch pipes are equidistantly arranged at the axial position of the main pipe.

[0013] The branch pipe is equipped with flushing nozzles, and multiple flushing nozzles are arranged at equal intervals.

[0014] Furthermore, a second shut-off valve and a first shut-off valve are respectively installed on the water supply pipe and the connecting pipe.

[0015] Furthermore, a drain pipe connected in communication with the heat exchange box is provided below the air inlet, and a control valve is installed on the drain pipe.

[0016] Furthermore, a second spray head is installed on the inner side of the desulfurization tower.

[0017] Furthermore, a second booster pump is installed on the outside of the desulfurization tower, and the output end of the second booster pump is connected to the second spray head through a pipeline.

[0018] Furthermore, a recovery pipe is conductively connected to the root of the side wall of the desulfurization tower.

[0019] 3. Beneficial effects

[0020] Compared with existing technologies, the advantages of this utility model are:

[0021] (1) In this scheme, the continuous S-shaped structure of the finned tubes can effectively increase the time for cold water to flow in the heat exchange box, thereby effectively improving the heat exchange efficiency. After the flue gas enters the desulfurization tower through the heat exchange box for desulfurization treatment, it enters the inner side of the heat recovery tower through the connecting pipe. The intermediate water is transported to the first spray head through the connecting pipe by the first booster pump to spray the flue gas. Multiple first spray heads are arranged longitudinally at equal intervals so that the spray water can fully exchange heat with the heat in the flue gas. At the same time, the filter grid is used to filter the particles mixed in the intermediate water. Finally, the heated water flows out through the hot water outlet pipe to supply the heating network. Through the step-type heat energy recovery, the heat in the flue gas can be recovered to the maximum extent and the waste of heat can be reduced.

[0022] (2) In this scheme, by closing the first shut-off valve and opening the second shut-off valve, the intermediate water in the connecting pipe is transported to the main pipe through the water supply pipe and then distributed to each branch pipe. Finally, the finned tube is sprayed with water through the flushing nozzle to ensure its heat exchange effect. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a side view of the heat exchange box and heat recovery tower of this utility model;

[0025] Figure 3 This is a cross-sectional schematic diagram of the heat exchange box and heat recovery tower AA of this utility model;

[0026] Figure 4 This is a structural schematic diagram of the present invention from another perspective.

[0027] Explanation of the labels in the diagram:

[0028] 1. Heat exchanger; 2. Desulfurization tower; 3. Heat recovery tower; 4. Air inlet; 5. Finned tube; 6. Sewage pipe; 7. Water supply pipe; 8. Main pipe; 9. Branch pipe; 10. Flushing nozzle; 11. Connecting pipe; 12. Hot water outlet pipe; 13. First spray head; 14. Filter grid; 15. Connecting pipe; 16. First booster pump; 17. First shut-off valve; 18. Second shut-off valve; 19. Second booster pump; 20. Second spray head; 21. Recovery pipe. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0030] Example:

[0031] Please see Figure 1-4 A cascade waste heat recovery heat exchanger for converter industrial flue gas includes a heat exchange box 1, a desulfurization tower 2 connected in conduction to the heat exchange box 1, and a heat recovery tower 3 installed above the desulfurization tower 2. The front end of the heat exchange box 1 is provided with an air inlet 4, and the inner side of the heat exchange box 1 is provided with a finned tube 5 arranged in a continuous S-shaped structure, and both ends of the finned tube 5 extend to the outer side of the heat exchange box 1.

[0032] A connecting pipe 11 is provided between the desulfurization tower 2 and the heat recovery tower 3;

[0033] A hot water outlet pipe 12 is connected to the root of the side wall of the heat recovery tower 3. A first spray head 13 is installed in the inner cavity of the heat recovery tower 3, and multiple first spray heads 13 are arranged longitudinally at equal intervals. A filter grid 14 is installed below the first spray head 13. A first booster pump 16 is installed on the outside of the heat recovery tower 3. A connecting pipe 15 connected to the first spray head 13 is installed at the output end of the first booster pump 16.

[0034] It should be noted that when the cascade waste heat recovery heat exchanger for converter industrial flue gas is in use, the purified converter flue gas is transported to the heat exchange box 1 through the air inlet 4, and cold water is injected into the finned tubes 5 at the same time. The continuous S-shaped structure of the finned tubes 5 can effectively increase the flow time of the cold water in the heat exchange box 1, thereby effectively improving the heat exchange efficiency.

[0035] After passing through heat exchange box 1, the flue gas enters desulfurization tower 2 for desulfurization treatment. Then, it enters the inner side of heat recovery tower 3 through connecting pipe 11. The first booster pump 16 delivers intermediate water through connecting pipe 15 to the first spray head 13 to spray the flue gas. Multiple first spray heads 13 are arranged longitudinally at equal intervals to ensure that the spray water can fully exchange heat with the flue gas. At the same time, the filter grid 14 filters the particles mixed in the intermediate water. Finally, the heated water flows out through hot water outlet pipe 12 to supply the heating network. Through step-by-step heat recovery, the heat in the flue gas can be recovered to the maximum extent and the waste of heat can be reduced.

[0036] like Figure 1 , Figure 4 As shown, a water supply pipe 7 is fixedly connected to the top of the heat exchange box 1 and is connected to the connecting pipe 15. A main pipe 8 connected to the water supply pipe 7 is installed at the top of the inner cavity of the heat exchange box 1. A branch pipe 9 is connected to the main pipe 8 and multiple branch pipes 9 are equidistantly arranged at the axial position of the main pipe 8. A flushing nozzle 10 is installed on the branch pipe 9 and multiple flushing nozzles 10 are equidistantly arranged.

[0037] A second shut-off valve 18 and a first shut-off valve 17 are respectively installed on the water supply pipe 7 and the connecting pipe 15;

[0038] It should be noted that by closing the first shut-off valve 17 and simultaneously opening the second shut-off valve 18, the intermediate water in the connecting pipe 15 is transported to the main pipe 8 through the water supply pipe 7, and then distributed to each branch pipe 9. Finally, the finned tube 5 is sprayed by the flushing nozzle 10 to ensure its heat exchange effect.

[0039] like Figure 1 As shown, a drain pipe 6 is provided below the air inlet 4 and is connected to the heat exchange box 1, and a control valve is installed on the drain pipe 6.

[0040] It should be noted that by opening the control valve on the drain pipe 6, the wastewater used to flush the finned tubes 5 in the heat exchange box 1 is discharged.

[0041] like Figure 4 As shown, a second spray head 20 is installed on the inner side of the desulfurization tower 2, and a second booster pump 19 is installed on the outer side of the desulfurization tower 2. The output end of the second booster pump 19 is connected to the second spray head 20 through a pipe.

[0042] It should be noted that by using the second booster pump 19 to deliver the desulfurization solution to the second spray head 20 for spraying the flue gas, a very good desulfurization treatment can be achieved.

[0043] like Figure 2 As shown, a recovery pipe 21 is conductively connected to the root of the side wall of the desulfurization tower 2;

[0044] It should be noted that the desulfurization solution can be recycled by flowing out through the recovery pipe 21.

[0045] In use: the purified converter flue gas is delivered to the heat exchange box 1 through the air inlet 4, and cold water is injected into the finned tube 5 at the same time. The continuous S-shaped structure of the finned tube 5 can effectively increase the flow time of the cold water in the heat exchange box 1, thereby effectively improving the heat exchange efficiency.

[0046] After the flue gas passes through the heat exchange box 1, it enters the desulfurization tower 2 for desulfurization treatment. Then, it enters the inner side of the heat recovery tower 3 through the connecting pipe 11. The first booster pump 16 delivers intermediate water through the connecting pipe 15 to the first spray head 13 to spray the flue gas. Multiple first spray heads 13 are arranged longitudinally at equal intervals to ensure that the spray water can fully exchange heat with the heat in the flue gas. At the same time, the filter grid 14 filters the particles mixed in the intermediate water. Finally, the heated water flows out through the hot water outlet pipe 12 to supply the heating network.

[0047] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A cascade waste heat recovery heat exchanger for converter industrial flue gas, comprising a heat exchange box (1), a desulfurization tower (2) connected in conduction to the heat exchange box (1), and a heat recovery tower (3) installed above the desulfurization tower (2), characterized in that: The heat exchange box (1) has an air inlet (4) at the front end. The heat exchange box (1) has a finned tube (5) with a continuous S-shaped structure installed on the inner side, and both ends of the finned tube (5) extend to the outer side of the heat exchange box (1). A connecting pipe (11) is provided between the desulfurization tower (2) and the heat recovery tower (3); A hot water outlet pipe (12) is connected to the root of the side wall of the heat recovery tower (3). A first spray head (13) is installed in the inner cavity of the heat recovery tower (3), and multiple first spray heads (13) are arranged longitudinally at equal intervals. A filter grid (14) is installed below the first spray head (13). A first booster pump (16) is installed on the outside of the heat recovery tower (3), and a connecting pipe (15) connected to the first spray head (13) is installed at the output end of the first booster pump (16).

2. A cascade waste heat recovery heat exchanger for converter industrial flue gas according to claim 1, characterized in that: The top of the heat exchange box (1) is fixedly connected to a water supply pipe (7) that is in communication with the connecting pipe (15); The top of the inner cavity of the heat exchange box (1) is equipped with a main pipe (8) that is connected to the water supply pipe (7). A branch pipe (9) is connected to the main pipe (8), and multiple branch pipes (9) are equidistantly arranged at the axial position of the main pipe (8). The branch pipe (9) is equipped with flushing nozzles (10), and multiple flushing nozzles (10) are arranged at equal intervals.

3. A cascade waste heat recovery heat exchanger for converter industrial flue gas according to claim 2, characterized in that: The water supply pipe (7) and the connecting pipe (15) are respectively equipped with a second shut-off valve (18) and a first shut-off valve (17).

4. A cascade waste heat recovery heat exchanger for converter industrial flue gas according to claim 1, characterized in that: Below the air inlet (4) is a drain pipe (6) that is connected to the heat exchange box (1), and a control valve is installed on the drain pipe (6).

5. A cascade waste heat recovery heat exchanger for converter industrial flue gas according to claim 1, characterized in that: A second spray head (20) is installed on the inner side of the desulfurization tower (2).

6. A cascade waste heat recovery heat exchanger for converter industrial flue gas according to claim 5, characterized in that: A second booster pump (19) is installed on the outside of the desulfurization tower (2), and the output end of the second booster pump (19) is connected to the second spray head (20) through a pipe.

7. A cascade waste heat recovery heat exchanger for converter industrial flue gas according to claim 1, characterized in that: The desulfurization tower (2) has a recovery pipe (21) connected to the root of its side wall.

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