Energy-saving heat exchange device for steam outlet of circulating water monitoring heat exchanger

Abstract

The utility model discloses a circulating water monitoring heat exchanger steam outlet energy-saving heat exchange device, steam condensate water passing through a heat exchanger enters a heat exchange box for secondary heat exchange, the temperature of the condensate water after secondary heat exchange is reduced to 30-40 DEG C from the original 80-90 DEG C, white smoke is not generated after the condensate water is discharged to an external discharge trench, and the energy-saving heat exchange device is simple in structure and convenient to operate. According to the steam trap, the influence on normal work of a sewage treatment plant is avoided, the temperature of the cold medium after heat exchange rises to 45-55 DEG C and can be recycled, a certain amount of energy is saved, and the problem that in the prior art, steam condensate remains in a heat exchanger when the steam trap works, and the primary heat exchange efficiency is reduced is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam heat recovery in sewage treatment plants, in particular to an energy-saving heat exchange device for the steam outlet of a circulating water monitoring heat exchanger. Background Art

[0002] The low-pressure steam from the sewage treatment plant needs to be heat exchanged before being discharged into the ditch. The heat exchange structure is as follows: Figure 3 As shown, it includes a heat exchanger and a circulating water supply. Low-pressure steam enters the heat exchanger shell. The pipeline inside the heat exchanger is used for circulating water circulation. The steam and the circulating water exchange heat through the pipe wall. The cooled condensed water is discharged from the outlet pipe 2 of the shell and flows to the drain valve 26 through an open ball valve 5. The drain valve continuously discharges the condensed water into the external drainage ditch. In actual use, it is found that the temperature of the condensed water after heat exchange in the heat exchanger is 80-90 degrees, and the flow rate is 35kg / h. Since the temperature of the condensed water is still very high, water mist will continuously emerge in the external drainage ditch after discharge, and white smoke will be formed when it is cooled, which affects the normal operation of the sewage treatment plant. In addition, the water at 80-90 degrees loses a certain amount of heat, which does not meet the requirements of energy saving and environmental protection. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide an energy-saving heat exchange device for monitoring the steam outlet of a circulating water heat exchanger.

[0004] The technical solution adopted by the utility model to solve the technical problem is:

[0005] A circulating water monitoring heat exchanger steam outlet energy-saving heat exchange device comprises a heat exchanger and a circulating water supply end, wherein one path of the circulating water supply end is connected to a pipeline in the heat exchanger, and is characterized in that: water flowing out of the shell outlet pipe of the heat exchanger passes through a heat exchange box as a heat medium and then is discharged to an external drainage ditch; water provided by another path of the circulating water supply end enters the heat exchange box as a cold medium and exchanges heat with the hot medium, and after completing the heat exchange, the cold medium can flow into a cooling tower sump and / or an insulation tank.

[0006] Further: the heat exchange box comprises a shell and a heat exchange part, the heat exchange part is sealed in the shell and the water inlet and the water outlet of the heat exchange part are respectively extended to the outside of the shell;

[0007] The heat medium flows into the heat exchange part from the water inlet and performs heat exchange with the cold medium between the heat exchange part and the shell. After the heat exchange, water is discharged from the water outlet to the external drainage ditch.

[0008] Further: the heat exchange part includes an outer shell and a partition, the water inlet is arranged at the upper end of one side of the outer shell, and the water outlet is arranged at the upper end or the lower end of the other side of the outer shell; a plurality of partitions spaced apart from each other are arranged between the water inlet and the water outlet, the upper ends of an odd number of partitions are connected to the inner top surface of the outer shell and the lower ends of these partitions are spaced apart from the inner bottom surface of the outer shell; the upper ends of an even number of partitions are spaced apart from the inner top surface of the outer shell and the lower ends of these partitions are connected to the inner bottom surface of the outer shell.

[0009] Furthermore: the cold medium flows into the shell and the heat exchange part from the cold medium inlet arranged at the lower end of one side of the shell and exchanges heat with the hot medium in the heat exchange part. The water after heat exchange flows from the outlet at the upper end of the other side of the shell to the cooling tower collection pool and / or the insulation tank.

[0010] Furthermore: an electrically controlled valve is connected in series on the pipeline between the outlet and the cooling tower collection tank; an electrically controlled valve is connected in series on the pipeline between the outlet and the insulation tank, and the control ends of the two electrically controlled valves are connected to a control unit, which is also connected to the output end of the liquid level meter installed on the insulation tank and the control end of the electrically controlled valve arranged in series on the insulation tank delivery pipe.

[0011] The technical effects achieved by the utility model are:

[0012] In the utility model, the steam condensed water after the heat exchanger enters the heat exchange box for the second heat exchange. The temperature of the condensed water after the second heat exchange is reduced from the original 80-90 degrees to 30-40 degrees. After being discharged to the external drainage ditch, no white smoke will be generated, avoiding the impact on the normal operation of the sewage treatment plant. The temperature of the cold medium after heat exchange rises to 45-55 degrees. These waters are directly transported to the cooling tower water collection tank and are also sent to the insulation tank for insulation storage. When the liquid level in the insulation tank reaches a high level, the electric control valve pipe wall is activated, and all the water is transported to the cooling tower water collection tank. When the water in the insulation tank is used and the liquid level is reduced to a medium-low level, the electric control valve is opened, and the heated water is transported to the insulation tank for replenishment. From the above process, it can be seen that the water finally discharged to the ditch will not produce white smoke, and the cold medium after heat exchange is reused, saving a certain amount of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 yes Figure 1 An enlarged cross-sectional view of a heat exchange box;

[0015] Figure 3 It is a schematic diagram of the prior art. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited by them.

[0017] A circulating water monitoring heat exchanger steam outlet energy-saving heat exchange device comprises a heat exchanger 1 and a circulating water supply end, one path (labeled A) of the circulating water supply end is connected to the pipeline in the heat exchanger, this path of circulating water flows from the B pipeline to the cooling tower sump, the water flowing out of the shell outlet pipe 2 of the heat exchanger passes through a heat exchange box 7 as a heat medium and then is discharged to an external drainage ditch; the water provided by another path 6 of the circulating water supply end enters the heat exchange box as a cold medium and exchanges heat with the hot medium, and after completing the heat exchange, the cold medium can flow into the cooling tower sump through the main pipeline 11 and / or flow into the insulation tank 9 through the auxiliary pipeline 13.

[0018] like Figure 2 As shown, the heat exchange box includes a shell 16 and a heat exchange part 17. The heat exchange part itself is installed in the shell in a closed manner through a supporting structure such as a bracket. Gaps are reserved around, above and below the heat exchange part and the inner wall of the shell. The water inlet 20 and the water outlet 23 of the heat exchange part are respectively extended to the outside of the shell. The hot medium flows into the heat exchange part from the water inlet and exchanges heat with the cold medium between the heat exchange part and the shell. After the heat exchange, the water is discharged from the water outlet to the external drainage ditch.

[0019] The heat exchange part includes a shell and a partition. The shell is composed of four side plates, an upper end plate and a bottom plate, which are fixedly connected to each other and form a closed cavity inside. Gaps 19 are reserved around, above and below the heat exchange part and the inner wall of the shell. A water inlet 20 is set at the upper end of one side of the shell, and the water inlet is connected to the outlet pipe 2 (connected in series with a ball valve 5) of the heat exchanger. A water outlet 23 is set at the upper or lower end of the other side of the shell, and the outlet discharges water to the external drainage ditch through a drain pipe 8 (connected in series with a ball valve 5). A plurality of partitions spaced from each other are set between the water inlet and the water outlet. The upper ends of the odd-numbered partitions 22 are connected to the inner top surface of the shell and the lower ends of these partitions are spaced from the inner bottom surface of the shell; the upper ends of the even-numbered partitions 21 are spaced from the inner top surface of the shell and the lower ends of these partitions are connected to the inner bottom surface of the shell. The odd-numbered partitions and the even-numbered partitions form a bending channel 24 that allows water to pass at a slower speed.

[0020] The cold medium flows into the shell and the heat exchange part from the cold medium inlet 25 provided at the lower end of one side of the shell and exchanges heat with the hot medium in the heat exchange part. The water after heat exchange flows from the outlet 18 at the upper end of the other side of the shell to one end of the ball valve 5 of the drain pipe 4. Then, after passing through the ball valve, the water is divided into two paths, one of which flows into the cooling tower water collection tank through the main line 11 (with the electric control valve 10 in series), and the other flows into the insulation tank 9 through the auxiliary line 13 (with the electric control valve 10 in series). The two paths can work simultaneously or one of them can work selectively.

[0021] The control ends of the two electrically controlled valves on the main pipeline and the auxiliary pipeline are connected to a control unit 15 through cables 14, and the control unit is also connected to the output end of the liquid level meter 3 installed on the insulation tank and the control end of the electrically controlled valve 10 arranged in series on the insulation tank delivery pipe 12.

[0022] The working process of this utility model is:

[0023] When the heat exchanger 1 is working, steam condensed water is continuously discharged through the outlet pipe 2. The steam condensed water flows to the heat exchange part through the water inlet 20 and exchanges heat with the cold medium provided by another circuit 6 of the circulating water supply end between the heat exchange part and the heat exchange box shell. The steam condensed water after exchanging heat is discharged to the external drainage ditch through the outlet 23 and the drain pipe 8. The cold medium in the heat exchange box after exchanging heat flows to the ball valve 5 through the outlet 18 and the drain pipe 4.

[0024] The liquid level meter can be a float type liquid level meter or a probe type liquid level meter, and its output end continuously transmits the liquid level data to the control unit through the cable 14. When the liquid level in the insulation tank reaches a high level, the control unit controls the electric control valve on the auxiliary pipeline 13 to close, and the cold medium only flows to the cooling tower sump through the main pipeline 11; the water in the insulation tank is continuously used, and when the liquid level in the insulation tank reaches a medium or low level, the control unit controls the electric control valve on the auxiliary pipeline 13 to open, and the cold medium flows into the insulation tank for replenishment at the same time, and then continuously adjusts the opening of the electric control valve on the auxiliary pipeline 13 according to the liquid level data until it is completely closed.

[0025] In the utility model, the steam condensate passing through the heat exchanger enters the heat exchange box for a second heat exchange. The temperature of the condensate after the secondary heat exchange is reduced from the original 80-90 degrees to 30-40 degrees, and no white smoke is generated after being discharged to the external drainage ditch, thereby avoiding the impact on the normal operation of the sewage treatment plant. The temperature of the cold medium after the heat exchange rises to 45-55 degrees and can be reused, saving a certain amount of energy. It also solves the problem of reduced primary heat exchange efficiency caused by the steam condensate remaining in the heat exchanger when the steam trap is working in the prior art.

Claims

1. An energy-saving heat exchange device for monitoring the steam outlet of a circulating water heat exchanger, comprising a heat exchanger and a circulating water supply end, wherein one path of the circulating water supply end is connected to a pipeline in the heat exchanger, and is characterized in that: The water flowing out of the shell outlet pipe of the heat exchanger is used as a heat medium and then discharged to an external drainage ditch after passing through a heat exchange box; the water provided by another route of the circulating water supply end enters the heat exchange box as a cold medium and exchanges heat with the hot medium. After completing the heat exchange, the cold medium can flow into the cooling tower sump and / or the insulation tank.

2. The energy-saving heat exchange device for steam outlet of a circulating water monitoring heat exchanger according to claim 1, characterized in that: The heat exchange box comprises a shell and a heat exchange part, the heat exchange part is sealed in the shell and the water inlet and the water outlet of the heat exchange part are respectively extended to the outside of the shell; The heat medium flows into the heat exchange part from the water inlet and performs heat exchange with the cold medium between the heat exchange part and the shell. After the heat exchange, water is discharged from the water outlet to the external drainage ditch.

3. The energy-saving heat exchange device for steam outlet of a circulating water monitoring heat exchanger according to claim 2, characterized in that: The heat exchange part includes an outer shell and a partition, the water inlet is arranged at the upper end of one side of the outer shell, and the water outlet is arranged at the upper end or the lower end of the other side of the outer shell; a plurality of partitions spaced apart from each other are arranged between the water inlet and the water outlet, the upper ends of an odd number of partitions are connected to the inner top surface of the outer shell and the lower ends of these partitions are spaced apart from the inner bottom surface of the outer shell; the upper ends of an even number of partitions are spaced apart from the inner top surface of the outer shell and the lower ends of these partitions are connected to the inner bottom surface of the outer shell.

4. The energy-saving heat exchange device for steam outlet of a circulating water monitoring heat exchanger according to claim 2 or 3, characterized in that: The cold medium flows into the shell and the heat exchange part from the cold medium inlet arranged at the lower end of one side of the shell and exchanges heat with the hot medium in the heat exchange part. The water after heat exchange flows from the outlet at the upper end of the other side of the shell to the cooling tower collection tank and / or the insulation tank.

5. The energy-saving heat exchange device for steam outlet of a circulating water monitoring heat exchanger according to claim 4, characterized in that: An electrically controlled valve is connected in series on the pipeline between the outlet and the cooling tower sump; an electrically controlled valve is connected in series on the pipeline between the outlet and the insulation tank, and the control ends of the two electrically controlled valves are connected to a control unit, which is also connected to the output end of the liquid level meter installed on the insulation tank and the control end of the electrically controlled valve arranged in series on the insulation tank delivery pipe.

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