External cooling device for dynamic wave washing circulating liquid

Abstract

The utility model relates to an external cooling device for dynamic wave washing circulation liquid. The external cooling device comprises a heat circulation system, a cold circulation system and a water cooling plate heat exchanger used for connecting the heat circulation system and the cold circulation system. The heat circulation system comprises an outer circulation liquid pipeline, an outer circulation pump and a filter press, an inlet and an outlet of the outer circulation liquid pipeline are communicated with the same circulation tank, and the outer circulation pump and the filter press are sequentially arranged on the outer circulation liquid pipeline; the cold circulating system comprises an outer circulating water pipeline, a cooling water circulating pump, a cooling water pool and a cooling tower, the outer circulating water pipeline is connected with an outer circulating liquid pipeline through a water cooling plate heat exchanger, and liquid in the outer circulating water pipeline and liquid in the outer circulating liquid pipeline are subjected to heat exchange in the water cooling plate heat exchanger; and a cooling water circulating pump, a cooling water tank and a cooling tower are sequentially arranged on the outer circulating water pipeline. The cooling effect of the dynamic wave washing circulating liquid is obvious, the discharge amount of waste acid is reduced, and the advancement of online filtration of smoke dust particles is reflected.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting flue gas cooling and washing, in particular to an external cooling device for the circulating liquid of a dynamic wave washer. Background Art

[0002] The process flow of the dynamic wave washer is as follows: High-temperature process flue gas enters from the top of the tower and flows downward along the air inlet pipe. The circulating pump sprays the circulating liquid used for washing upward from the bottom in the air inlet pipe through a nozzle, so as to collide with the high-temperature dusty flue gas reversely, forming a turbulent foam layer with heat transfer and mass transfer effects. In this foam layer, the gas-liquid two phases are in close contact, and then the flue gas is washed, cooled and dedusted. The high-temperature process flue gas after washing and purification leaves from the top outlet of the liquid collecting tank, while the circulating liquid flows downward into the liquid collecting tank.

[0003] After the high-temperature process flue gas is washed and cooled, the dust and water vapor with higher heat content therein will precipitate and accumulate in the liquid collecting tank, thereby increasing the dust content and temperature of the circulating liquid in the liquid collecting tank. Therefore, it is necessary to filter and cool the circulating liquid. As Figure 1 shown, conventionally, a settling tank is generally arranged below the liquid collecting tank, and the circulating liquid can flow into the settling tank. The settled sludge is pumped to a filter press by a pump. The filter press is a solid-liquid separation device, and the separated liquid enters the filtration pool and can be discharged externally by a pump.

[0004] Meanwhile, the liquid separated in the settling tank enters the circulating tank. The circulating liquid in the circulating tank is still at a relatively high temperature. Therefore, the method of replenishing water and draining water is adopted in the circulating tank to reduce the temperature of the circulating liquid, and then the circulating liquid is pumped to the nozzle by the circulating pump.

[0005] Since the used circulating liquid has a high temperature and is generally acidic sewage, after discharging a part of the circulating liquid and then adding new circulating liquid, although the temperature can be reduced, the discharged circulating liquid will increase the load of the sewage treatment system and the pressure of treating acidic sewage, and the water consumption is also significantly increased. And if the amount of water replaced is small, the temperature of the circulating liquid will still rise (the high-temperature FRP washer can withstand a maximum of 75°C for a long time), seriously restricting the increase of the feeding amount of the smelting furnace. Even in summer when the temperature is relatively high, the feeding amount has to be reduced to maintain production. Summary of the Invention

[0006] In order to solve the problems that the conventional method of cooling the circulating liquid by replenishing water and draining water not only increases the pressure of sewage treatment but also has a large water consumption and a poor cooling effect, the utility model provides an external cooling device for the circulating liquid of a dynamic wave washer, and a separate independent external circulation cooling device is arranged on the circulating tank, which not only does not affect the operation of the conventional flue gas cooling system, but also can achieve a fast and efficient cooling effect. At the same time, it can also reduce the amount of externally discharged acidic sewage and reduce the pollution treatment cost.

[0007] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0008] A power wave washing circulating liquid external cooling device, comprising a hot circulation system, a cold circulation system, and a water-cooled plate heat exchanger for connecting the hot circulation system and the cold circulation system;

[0009] The hot circulation system includes an external circulation liquid pipeline, an external circulation pump, and a filter press. Both the inlet and outlet of the external circulation liquid pipeline are connected to the same circulation tank. The circulating liquid in the circulation tank enters the external circulation liquid pipeline and finally returns to the circulation tank. The external circulation pump and the filter press are sequentially arranged on the external circulation liquid pipeline. The external circulation pump facilitates pumping the circulating liquid into the filter press, reducing the scaling of the sludge at the bottom of the circulation tank in the water-cooled plate heat exchanger and affecting the heat exchange effect of the water-cooled plate heat exchanger;

[0010] The cold circulation system includes an external circulation water pipeline, a cooling water circulation pump, a cooling water tank, and a cooling tower. The external circulation water pipeline and the external circulation liquid pipeline are connected by one of the water-cooled plate heat exchangers. The liquids in the external circulation water pipeline and the external circulation liquid pipeline exchange heat in the water-cooled plate heat exchanger. The cooling water circulation pump, the cooling water tank, and the cooling tower are sequentially arranged on the external circulation water pipeline. The water flowing through the cooling tower flows into the cooling water tank and is sent to the water-cooled plate heat exchanger by the cooling water circulation pump.

[0011] Further, the inlet of the external circulation liquid pipeline is connected to the circulation tank below the liquid level, and the outlet of the external circulation liquid pipeline is connected to the circulation tank above the liquid level. The external circulation liquid pipeline is made of a steel-lined fluorine pipeline to improve the strength and corrosion resistance of the pipeline. The liquid return port of the pipeline is above the liquid level to ensure that the return liquid flows back into the circulation tank smoothly, minimizing the operating load of the external circulation pump.

[0012] Further, the external circulation pump, the filter press, and the water-cooled plate heat exchanger are sequentially connected in series through an external circulation pipeline. The filter press is arranged in parallel with two units for convenient one-for-one standby. When cleaning the filter cake of the filter press, the bypass pipeline is used to switch the operation of the filter press without affecting the normal operation of the cooling device.

[0013] Further, the two filter presses are respectively a filter press one and a filter press two. The filter press one is connected in series on the external circulation pipeline. The liquid inlet and outlet of the filter press two are respectively connected to a water inlet pipe and a water outlet pipe. One end of the water inlet pipe and one end of the water outlet pipe are both connected to the external circulation liquid pipeline. Three-way valves one are arranged at the connections of the water inlet pipe, the water outlet pipe, and the external circulation liquid pipeline to facilitate the switching between the filter press one and the filter press two.

[0014] Further, the cooling water circulation pump, the cooling water tank, the cooling tower, and the water-cooled plate heat exchanger are sequentially connected in series through an external circulation water pipeline. Both the inlet and outlet of the external circulation water pipeline are connected to the same water-cooled plate heat exchanger.

[0015] Further, the external circulation liquid pipeline is connected to the hot fluid inlet and outlet of the water-cooled plate heat exchanger, and the external circulation water pipeline is connected to the cold fluid inlet and outlet of the water-cooled plate heat exchanger. The water-cooled plate heat exchanger is a plate heat exchanger.

[0016] Further, an acid inlet pipe is connected between the hot fluid inlet and the cold fluid inlet of the water-cooled plate heat exchanger, and a second three-way valve is arranged between the acid inlet pipe and the cold fluid inlet, which facilitates the introduction of the circulating liquid into the cold fluid inlet of the water-cooled plate heat exchanger through the acid inlet pipe for scale removal.

[0017] A third three-way valve is arranged at the cold fluid outlet of the water-cooled plate heat exchanger. The third three-way valve is respectively connected to a sewage discharge pipe and the inlet of the external circulation water pipeline, which facilitates the discharge of the removed scale.

[0018] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0019] Without changing the existing dynamic wave washing circulation system, the present utility model is equipped with an external dynamic wave washing circulating liquid cooling device that matches the existing dynamic wave washing circulation volume, and completes the hot circulation system: circulation tank - external circulation pump - filter press - water-cooled plate heat exchanger - circulation tank, and the cold circulation system: cooling water pool - cooling water circulation pump - water-cooled plate heat exchanger - cooling tower - cooling water pool. Thus, the circulating liquid and the cooling water can perform heat exchange in the water-cooled plate heat exchanger, so as to dissipate the heat absorbed by the dynamic wave washing circulating liquid into the atmosphere, and achieve the purpose of quickly and efficiently cooling the washing circulating liquid.

[0020] The present utility model transfers the heat absorbed by the dynamic wave washing circulating liquid into the circulating cooling water through the water-cooled plate heat exchanger, and then dissipates the heat into the atmosphere by the evaporation of the circulating water cooling tower, which can achieve a quick and efficient cooling effect. Compared with the traditional cooling method of replenishing water and discharging water, the amount of externally discharged acidic waste can be reduced, and the relatively high pollution treatment cost can be saved.

[0021] The present utility model extracts the circulating liquid from below the liquid level of the circulation tank to the filter press, avoiding the deposition of sludge in the external circulation device in the water-cooled plate heat exchanger, ensuring the heat exchange effect of the water-cooled plate heat exchanger, and at the same time reducing the deposition and blockage of sludge in the washing circulating liquid at the nozzle. The cooled washing circulating liquid returns from above the liquid level of the circulation tank, which can reduce the operating resistance of the dynamic wave washing circulating liquid cooling device.

[0022] In the present utility model, there are also an acid inlet pipe, a second three-way valve, a third three-way valve and a sewage discharge pipe, so that a pipeline for switching between the acid / water sides of the water-cooled plate heat exchanger can be formed. When it is found that the pressure on the water side, that is, the side through which the cold circulation system flows, is relatively high, it indicates that the water side is scaled. Then, the water side scale can be soaked with the acidic circulating liquid in the acid side, that is, the side through which the hot circulation system flows, to clean the scale in the water-cooled plate heat exchanger, improve the heat exchange effect of the water-cooled plate heat exchanger, and reduce the impact of scale removal and shutdown of the water side of the water-cooled plate heat exchanger on the system. Description of the Drawings

[0023] Figure 1 It is the schematic diagram of a conventional circulating liquid cooling system.

[0024] Figure 2 It is one of the schematic diagrams of the system of an external cooling device for the power wave washing circulating liquid of the present utility model.

[0025] Figure 3 It is the second schematic diagram of the system of an external cooling device for the power wave washing circulating liquid of the present utility model.

[0026] Figure 4 It is the schematic diagram of scale cleaning in the embodiment of an external cooling device for the power wave washing circulating liquid of the present utility model.

[0027] The reference numerals in the drawings are: 1 heat circulation system, 101 external circulating liquid pipeline, 102 external circulating pump, 103 filter press, 2 cold circulation system, 201 external circulating water pipeline, 202 cooling water circulating pump, 203 cooling water tank, 204 cooling tower, 3 water-cooled plate heat exchanger, 31 hot fluid inlet, 32 hot fluid outlet, 33 cold fluid inlet, 34 cold fluid outlet, 4 circulation tank, 5 filter press 1, 6 filter press 2, 7 water inlet pipe, 8 water outlet pipe, 9 three-way valve 1, 10 acid inlet pipe, 11 three-way valve 2, 12 three-way valve 3, 13 sewage discharge pipe. Specific Embodiments

[0028] The following describes in detail the specific embodiments of the present utility model with reference to the drawings:

[0029] As Figures 2 to 4 shown, an external cooling device for the power wave washing circulating liquid includes a heat circulation system 1, a cold circulation system 2, and a water-cooled plate heat exchanger 3 for connecting the heat circulation system 1 and the cold circulation system 2. Heat exchange is carried out between the heat circulation system 1 and the cold circulation system 2 through the water-cooled plate heat exchanger 3 to achieve cooling, as Figure 2 and Figure 3 shown.

[0030] The heat circulation system 1 includes an external circulating liquid pipeline 101, an external circulating pump 102, and a filter press 103. Both the inlet and outlet of the external circulating liquid pipeline 101 are connected to the same circulation tank 4, and the circulation tank 4 is filled with circulating liquid. When arranging the external circulating liquid pipeline 101, the inlet of the external circulating liquid pipeline 101 is connected below the liquid level of the circulation tank 4, and the outlet of the external circulating liquid pipeline 101 is connected above the liquid level of the circulation tank 4.

[0031] An external circulation liquid pipeline 101 is successively provided with an external circulation pump 102 and a filter press 103. The external circulation pump 102 can pump the liquid in the circulation tank 4 to the filter press 103. A water-cooled plate heat exchanger 3 is also provided on the external circulation liquid pipeline 101. The water-cooled plate heat exchanger 3 is a plate heat exchanger, and the water-cooled plate heat exchanger 3 is provided with a hot fluid inlet 31, a hot fluid outlet 32, a cold fluid inlet 33 and a cold fluid outlet 34.

[0032] When the external circulation liquid pipeline 101 is installed with the water-cooled plate heat exchanger 3, the external circulation liquid pipeline 101 communicates with the hot fluid inlets and outlets of the water-cooled plate heat exchanger 3. The external circulation pump 102, the filter press 103 and the water-cooled plate heat exchanger 3 are successively connected in series through the external circulation pipeline. Thus, the liquid separated by the filter press 103 enters the water-cooled plate heat exchanger 3 and then returns to the circulation tank 4.

[0033] In this embodiment, there are two filter presses 103 arranged in parallel, one for standby. The two filter presses 103 are respectively a first filter press 5 and a second filter press 6. The first filter press 5 is connected in series on the external circulation pipeline. The liquid inlets and outlets of the second filter press 6 are respectively communicated with a water inlet pipe 7 and a water outlet pipe 8. One end of the water inlet pipe 7 and one end of the water outlet pipe 8 are both communicated with the external circulation liquid pipeline 101. Three-way valves 9 are provided at the connections of the water inlet pipe 7, the water outlet pipe 8 and the external circulation liquid pipeline 101 to control the flow direction of the circulating liquid.

[0034] The cold circulation system 2 includes an external circulation water pipeline 201, a cooling water circulation pump 202, a cooling water tank 203 and a cooling tower 204. The external circulation water pipeline 201 is successively provided with the cooling water circulation pump 202, the cooling water tank 203 and the cooling tower 204. At the same time, the external circulation water pipeline 201 and the external circulation liquid pipeline 101 are connected through a water-cooled plate heat exchanger 3, that is, a water-cooled plate heat exchanger 3 is also provided on the external circulation water pipeline 201, and the water-cooled plate heat exchanger 3 on the external circulation water pipeline 201 is the same as the water-cooled plate heat exchanger 3 on the external circulation liquid pipeline 101.

[0035] When the external circulation water pipeline 201 is installed with the water-cooled plate heat exchanger 3, the inlets and outlets of the external circulation water pipeline 201 are both communicated with the same water-cooled plate heat exchanger 3, that is, the external circulation water pipeline 201 communicates with the cold fluid inlets and outlets of the water-cooled plate heat exchanger 3. In this way, the cooling water circulation pump 202, the cooling water tank 203, the cooling tower 204 and the water-cooled plate heat exchanger 3 are successively connected in series through the external circulation water pipeline 201. The cooling water tank 203 is filled with cooling water. The cooling water is pumped into the water-cooled plate heat exchanger 3 by the cooling water circulation pump 202 for heat exchange, and then the cooling water flows to the cooling tower 204. The cooling tower 204 cools it and then returns it to the cooling water tank 203.

[0036] The principle of this utility model is as follows: The circulating liquid after washing flows from the liquid collecting tank and the sedimentation tank to the circulation tank 4. In the initial state, the three-way valve 1 9 is controlled to connect the first filter press 5 and the external circulating liquid pipeline 101. The thermal circulation system 1 is started, and the external circulation pump 102 extracts the circulating liquid in the circulation tank 4 and pumps it into the first filter press 5. After solid-liquid separation by the first filter press 5, the circulating liquid enters the water-cooled plate heat exchanger 3 and finally returns to the circulation tank 4 along the external circulating liquid pipeline 101.

[0037] Meanwhile, the cold circulation system 2 is also started. The cooling water circulation pump 202 extracts the cooling water in the cooling water tank 203 and enters the water-cooled plate heat exchanger 3. Then, the heated cooling water is cooled by the cooling tower 204 and then returns to the cooling water tank 203. During this process, the high-temperature circulating liquid flows in the water-cooled plate heat exchanger 3, and the low-temperature cooling water also flows in the water-cooled plate heat exchanger 3, so heat exchange is carried out, and thus the circulating liquid is cooled down, realizing the cooling of the circulating liquid in the circulation tank 4. Although the temperature of the cooling water rises, it can be cooled by the subsequent cooling tower 204.

[0038] This utility model is an independent external circulation system, which does not affect the operation of the original flue gas cooling system, and the equipment configuration design is relatively convenient. By using the water-cooled plate heat exchanger 3, the heat absorbed by the power wave washing circulating liquid is transferred to the circulating cooling water, and the cold circulation system 2 dissipates the heat into the atmosphere through the cooling tower 204, solving the industry problems of large sludge at the bottom of the traditional power wave circulation tank 4, high temperature of the circulating liquid, and large amounts of makeup water, drainage, cooling, and sewage discharge.

[0039] After the first filter press 5 has been running for a long time and needs to clean the filter cake, the three-way valve 1 9 is controlled to connect the second filter press 6 and the external circulating liquid pipeline 101, so as to connect the second filter press 6 to the thermal circulation system 1, and the first filter press 5 temporarily exits the thermal circulation system 1. In this way, the two filter presses 103 can be switched and used as spares for each other, that is, one is in use and the other is in standby, without affecting the normal operation of the entire cooling device.

[0040] The circulating liquid has an independent flow channel in the water-cooled plate heat exchanger 3, and the cooling water also has an independent flow channel in the water-cooled plate heat exchanger 3. After the entire cooling device has been running for a long time, scale may appear in the flow channels of the cooling water in the water-cooled plate heat exchanger 3, affecting the normal circulation flow of the cooling water.

[0041] Therefore, it is necessary to clean the water scale. Here, an acid inlet pipe 10 is connected between the hot fluid inlet 31 and the cold fluid inlet 33 of the water-cooled heat exchanger 3. A second three-way valve 11 is arranged between the acid inlet pipe 10 and the cold fluid inlet 33. The second three-way valve 11 can control the connection between the cold fluid inlet 33 and the acid inlet pipe 10 or the external circulation water pipe 201. Thus, the circulating liquid can enter the acid inlet pipe 10. After operating the second three-way valve 11, the circulating liquid in the acid inlet pipe 10 can be introduced into the cooling water flow channel in the water-cooled heat exchanger 3, as Figure 4 shown. At the same time, a third three-way valve 12 is arranged at the cold fluid outlet 34 of the water-cooled heat exchanger 3. The third three-way valve 12 is respectively connected to a sewage discharge pipe 13 and the inlet of the external circulation water pipe 201. Operating the third three-way valve 12 can control the connection between the cold fluid outlet 34 and the sewage discharge pipe 13 or the external circulation water pipe 201.

[0042] When cleaning the water scale, use the circulating liquid containing acid to clean. Control one second three-way valve 11 to realize the connection between the acid inlet pipe 10 and the cold fluid inlet 33, and control the other third three-way valve 12 to realize the connection between the cold fluid outlet 34 and the sewage discharge pipe 13. In this way, the circulating liquid enters the cooling water flow channel from the acid inlet pipe 10 to clean the water scale, and the cleaned liquid is discharged through the sewage discharge pipe 13.

[0043] The above embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent should be included in the scope of the patent application of the present invention.

Claims

1. A power wave washing circulating liquid external cooling device, characterized in that: It comprises a heat circulation system (1), a cold circulation system (2), and a water cooling plate exchanger (3) for connecting the heat circulation system (1) and the cold circulation system (2); The thermal circulation system (1) comprises an external circulation liquid pipeline (101), an external circulation pump (102) and a filter press (103); the inlet and outlet of the external circulation liquid pipeline (101) are both connected to the same circulation tank (4); the external circulation pump (102) and the filter press (103) are sequentially arranged on the external circulation liquid pipeline (101); The cold circulation system (2) comprises an external circulation water pipeline (201), a cooling water circulation pump (202), a cooling water pool (203) and a cooling tower (204); the external circulation water pipeline (201) and the external circulation liquid pipeline (101) are connected via a water cooling plate exchanger (3); and the cooling water circulation pump (202), the cooling water pool (203) and the cooling tower (204) are sequentially arranged on the external circulation water pipeline (201).

2. The external cooling device for the power wave washing circulating liquid according to claim 1 is characterized in that: The inlet of the external circulation liquid pipeline (101) is connected to the circulation tank (4) below the liquid level, and the outlet of the external circulation liquid pipeline (101) is connected to the circulation tank (4) above the liquid level.

3. The external cooling device for the power wave washing circulating liquid according to claim 1 is characterized in that: The external circulation pump (102), the filter press (103) and the water-cooled plate exchanger (3) are sequentially connected in series via an external circulation pipeline, and the filter press (103) comprises two units arranged in parallel.

4. The external cooling device for the power wave washing circulating liquid according to claim 3 is characterized in that: The two filter presses (103) are filter press one (5) and filter press two (6), respectively. Filter press one (5) is connected in series to the external circulation pipeline. The liquid inlet and outlet of filter press two (6) are respectively connected to an inlet pipe (7) and an outlet pipe (8). One end of the inlet pipe (7) and one end of the outlet pipe (8) are both connected to the external circulation liquid pipeline (101). Three-way valve one (9) is provided at the connection between the inlet pipe (7), the outlet pipe (8) and the external circulation liquid pipeline (101).

5. The external cooling device for the power wave washing circulating liquid according to claim 1 is characterized in that: The cooling water circulation pump (202), the cooling water pool (203), the cooling tower (204) and the water-cooled plate exchanger (3) are sequentially connected in series via an external circulating water pipeline (201), and the inlet and outlet of the external circulating water pipeline (201) are both connected to the same water-cooled plate exchanger (3).

6. The external cooling device for the power wave washing circulating liquid according to claim 1, characterized in that: The external circulation liquid pipeline (101) is connected to the hot fluid inlet and outlet of the water-cooled plate heat exchanger (3), and the external circulation water pipeline (201) is connected to the cold fluid inlet and outlet of the water-cooled plate heat exchanger (3). The water-cooled plate heat exchanger (3) is a plate heat exchanger.

7. The external cooling device for the power wave washing circulating liquid according to claim 6, characterized in that: An acid inlet pipe (10) is connected between the hot fluid inlet (31) and the cold fluid inlet (33) of the water-cooled plate exchanger (3), and a three-way valve (11) is provided between the acid inlet pipe (10) and the cold fluid inlet (33); The cold fluid outlet (34) of the water-cooled plate exchanger (3) is provided with a three-way valve (12), and the three-way valve (12) is respectively connected to a sewage pipe (13) and an inlet of the external circulating water pipeline (201).

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