Tail gas heat energy recovery system of multi-stage centrifugal pump of papermaking machine turbine

Abstract

The utility model relates to the technical field of tail gas heat energy utilization of turbine fans of paper mills, in particular to a tail gas heat energy recovery system of a turbine multistage centrifugal pump of a paper machine. The system comprises a waste gas filtering device, a heat energy recycling device, a clear water circulating device and a waste gas treatment device, the heat energy recycling device comprises a heat exchanger, the waste gas treatment device comprises a spraying tower, the waste gas treatment device comprises a filtering box and a turbine multi-stage centrifugal pump, the turbine multi-stage centrifugal pump is connected to the filtering box through a pipeline, and the spraying tower is connected to the spraying tower. The bottom end of the heat exchanger is connected to the filter box, the top end of the heat exchanger is connected to the bottom end of the spray tower through a pipeline, and the clear water circulating device is connected to the heat exchanger through a water pipe. According to the utility model, the turbine multistage centrifugal pump exhausts air to heat the clear water of the paper machine, so that the waste heat is effectively utilized, the temperature of the papermaking clear water is increased, the energy consumption is saved, the exhaust temperature is reduced, the amount of water exhausted into the atmosphere is reduced, and the environment protection is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of heat energy utilization of tail gas of turbine blowers in paper mills, in particular to a heat energy recovery system for tail gas of turbine multi-stage centrifugal pumps of paper mills. Background Art

[0002] In the traditional papermaking process, the papermaking machine needs to be equipped with a turbine multistage centrifugal pump to provide the necessary vacuum. The temperature of the wet air discharged by the pump is about 170℃, containing a small amount of water and paper hair. These gases are directly discharged into the atmosphere without treatment, which not only causes energy waste, but also may have adverse effects on the environment. At present, most papermaking companies around the world use cooling towers to supply water when cooling turbine multistage centrifugal pumps during production. Cooling towers will cause noise pollution and consume a lot of water. Especially in winter, due to the abnormal operation of the cooling tower caused by low temperature, the hot water needed to dissolve the medicine is provided by a dedicated person through boiler heating water. This requires two sets of equipment, which not only increases the initial investment, but also increases the operating costs. Therefore, using the heat in the exhaust gas of the turbine multistage centrifugal pump to heat clean water and achieve heat energy recovery will have good economic and social benefits. Utility Model Content

[0003] In order to solve the above-mentioned problems, the utility model provides a paper machine turbine multi-stage centrifugal pump tail gas heat energy recovery system.

[0004] In the first aspect, the utility model provides a paper machine turbine multi-stage centrifugal pump tail gas heat energy recovery system, which adopts the following technical solutions:

[0005] A paper machine turbine multistage centrifugal pump tail gas heat energy recovery system, comprising an exhaust gas filtering device, a heat energy recovery device, a clean water circulation device and an exhaust gas treatment device, wherein the heat energy recovery device comprises a heat exchanger, the exhaust gas treatment device comprises a spray tower, the exhaust gas treatment device comprises a filter box and a turbine multistage centrifugal pump, the turbine multistage centrifugal pump is connected to the filter box through a pipeline, the bottom end of the heat exchanger is connected to the filter box, the top end of the heat exchanger is connected to the bottom end of the spray tower through a pipeline, and the clean water circulation device is connected to the heat exchanger through a water pipe.

[0006] Furthermore, the filter box includes an air inlet end, an air outlet end and a sewage outlet, the turbine multistage centrifugal pump is connected to the air inlet end of the filter box through a pipeline, and the air outlet end of the filter box is connected to the bottom end of the heat exchanger.

[0007] Furthermore, the heat exchanger includes a heat exchanger shell side and a heat exchanger tube side, the heat exchanger tube side includes a heat exchanger water inlet pipe and a heat exchanger water outlet pipe, the heat exchanger water inlet pipe is arranged at the upper part of the heat exchanger, and the heat exchanger water outlet pipe is arranged at the lower part of the heat exchanger.

[0008] Furthermore, the water inlet pipe of the heat exchanger includes a water inlet valve, and the water outlet pipe of the heat exchanger includes a water outlet valve, and the water inlet valve and the water outlet valve are respectively installed on the water inlet and water outlet pipes.

[0009] Furthermore, the bottom end of the heat exchanger is connected to a filter box, including the bottom end of the heat exchanger shell being connected to the filter box, and the top end of the heat exchanger is connected to the bottom end of a spray tower through a pipe, including the top end of the heat exchanger shell being connected to the bottom end of a spray tower through a pipe.

[0010] Furthermore, the clean water circulation device includes a clean water tank and a clean water filter, wherein the clean water tank includes a water outlet and a water inlet, the clean water filter includes a water outlet and a water inlet, the water outlet of the clean water tank is connected to the water inlet of the clean water filter, the water outlet of the clean water filter is connected to the water inlet pipe of the heat exchanger, and the water outlet pipe of the heat exchanger is connected to the water inlet of the clean water tank.

[0011] Furthermore, the clean water circulation device also includes a water pump and a flow control valve, and the water pump and the flow control valve are installed on the water pipe between the clean water filter and the clean water tank.

[0012] Furthermore, the clean water filter is provided with a water flow detection device, which includes a first water flow detector and a second water flow detector, and the first water flow detector and the second water flow detector are installed on the water pipe of the water inlet and the water pipe of the water outlet of the clean water filter.

[0013] Furthermore, the exhaust gas treatment device includes a spray tower, an exhaust gas pipe and a spraying device. The exhaust gas pipe is installed at the top of the spray tower. The exhaust gas in the shell side of the heat exchanger is transported to the spray tower. The exhaust gas in the spray tower is transported to the outdoors through the spray tower and the exhaust gas pipe.

[0014] Furthermore, the spray equipment comprises a spray pump, a spray pipe and a spray head. The spray pump is arranged outside the spray tower, the spray head is arranged in the upper part of the spray tower, and the two ends of the spray pipe are respectively connected to the spray pump and the spray head.

[0015] In summary, the utility model has the following beneficial technical effects:

[0016] The heat energy recovery system of the vacuum pump of a paper machine of the utility model can effectively improve the energy utilization efficiency of the papermaking process and reduce the impact on the environment.

[0017] The utility model provides a paper machine vacuum pump tail gas heat energy recovery system, the system includes a turbine multistage centrifugal pump, a spray tower, a heat exchanger and other components, the heat exchanger is installed in front of the spray tower, the heat exchanger realizes the preheating of the paper machine clean water through the heat exchange between the shell side and the tube side. The clean water of the paper machine is heated by exhausting the turbine multistage centrifugal pump, which not only effectively utilizes the waste heat, increases the temperature of the papermaking clean water, reduces the steam consumption of the paper machine, saves energy consumption, but also reduces the exhaust temperature of the turbine multistage centrifugal pump, reduces the water content of the spray tower and the amount of water discharged into the atmosphere, which is beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural block diagram of a paper machine turbine multi-stage centrifugal pump tail gas heat energy recovery system according to an embodiment of the utility model;

[0019] Figure 2 It is a block diagram of a heat recovery device according to an embodiment of the utility model;

[0020] Figure 3 This is a block diagram of a clean water circulation device according to an embodiment of the utility model;

[0021] Figure 4 This is a block diagram of the waste gas treatment device of the embodiment of the utility model;

[0022] Figure 5 The utility model is a schematic diagram of a paper machine turbine multi-stage centrifugal pump tail gas heat energy recovery system according to an embodiment of the present invention.

[0023] Among them, 1. turbine multi-stage centrifugal pump; 2. filter box; 3. heat exchanger outlet pipe; 4. spray pump; 5. outlet valve; 6. spray pipe; 7. spray tower; 8. nozzle; 9. exhaust pipe; 10. heat exchanger; 11. water inlet valve; 12. heat exchanger inlet pipe; 13. clean water filter; 14. first water flow detector; 15. flow control valve; 16. second water flow detector; 17. clean water tank; 18. water pump. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0025] Example 1

[0026] Reference Figure 1, a paper machine turbine multistage centrifugal pump tail gas heat energy recovery system of this embodiment includes an exhaust gas filtering device, a heat energy recovery device, a clean water circulation device and an exhaust gas treatment device, the heat energy recovery device includes a heat exchanger 10, the exhaust gas treatment device includes a spray tower 7, the exhaust gas treatment device includes a filter box 2 and a turbine multistage centrifugal pump 1, the turbine multistage centrifugal pump 1 is connected to the filter box 2 through a pipeline, the bottom end of the heat exchanger 10 is connected to the filter box 2, the top end of the heat exchanger 10 is connected to the bottom end of the spray tower 7 through a pipeline, and the clean water circulation device is connected to the heat exchanger 10 through a water pipe.

[0027] The turbine multistage centrifugal pump 1 is connected to the filter box 2 through a pipeline, and a tee is installed on the connected pipeline to play a role in emergency exhaust.

[0028] The filter box 2 includes an air inlet end, an air outlet end and a sewage outlet. The turbine multi-stage centrifugal pump 1 is connected to the air inlet end of the filter box 2 through a pipeline, and the air outlet end of the filter box 2 is connected to the bottom end of the heat exchanger 10.

[0029] The heat exchanger 10 includes a heat exchanger shell side and a heat exchanger tube side. The heat exchanger tube side includes a heat exchanger water inlet pipe 12 and a heat exchanger water outlet pipe 3. The heat exchanger water inlet pipe 12 is arranged at the upper part of the heat exchanger 10, and the heat exchanger water outlet pipe 3 is arranged at the lower part of the heat exchanger 10.

[0030] The water inlet pipe of the heat exchanger 10 includes a water inlet valve 11, and the water outlet pipe 3 of the heat exchanger includes a water outlet valve 5. The water inlet valve 11 and the water outlet valve 5 are respectively installed on the water inlet and water outlet pipes.

[0031] The bottom end of the heat exchanger 10 is connected to the filter box 2, including the bottom end of the heat exchanger shell being connected to the filter box 2, and the top end of the heat exchanger 10 is connected to the bottom end of the spray tower 7 through a pipeline, including the top end of the heat exchanger shell being connected to the bottom end of the spray tower 7 through a pipeline.

[0032] The clean water circulation device includes a clean water tank 17 and a clean water filter 13, wherein the clean water tank 17 includes a water outlet and a water inlet, and the clean water filter 13 includes a water outlet and a water inlet, the water outlet of the clean water tank 17 is connected to the water inlet of the clean water filter 13, the water outlet of the clean water filter 13 is connected to the water inlet pipe of the heat exchanger, and the heat exchanger water outlet pipe 3 is connected to the water inlet of the clean water tank 17.

[0033] The clean water circulation device further comprises a water pump 18 and a flow control valve 15 , and the water pump 18 and the flow control valve 15 are installed on the water pipe between the clean water filter 13 and the clean water tank 17 .

[0034] The clean water filter 13 is provided with a water flow detection device, which includes a first water flow detector 14 and a second water flow detector 16. The first water flow detector 14 and the second water flow detector 16 are installed on the water pipe at the water inlet and the water pipe at the water outlet of the clean water filter 13.

[0035] The exhaust gas treatment device includes a spray tower 7, an exhaust gas pipe 9 and a spray device. The exhaust gas pipe 9 is installed at the top of the spray tower 7. The exhaust gas in the shell of the heat exchanger is transported to the spray tower 7. The exhaust gas in the spray tower 7 is transported to the outdoors through the spray tower 7 and the exhaust gas pipe 9.

[0036] The spray equipment comprises a spray pump 4, a spray pipe 6 and a spray head 8. The spray pump 4 is arranged outside the spray tower 7, the spray head 8 is arranged in the upper part of the spray tower 7, and the two ends of the spray pipe 6 are connected to the spray pump 4 and the spray head 8 respectively.

[0037] The hot and humid exhaust gas discharged by the turbine multi-stage centrifugal pump is filtered through the filter box, and the filtered exhaust gas enters the shell side of the heat exchanger. At the same time, the clean water is filtered through the clean water filter from the clean water tank and enters the tube side of the air exchanger. The clean water flows from top to bottom in the heat exchanger, and the hot and humid exhaust gas flows from bottom to top in the heat exchanger. The clean water in the tube side of the heat exchanger and the hot and humid exhaust gas in the shell side of the heat exchanger complete heat exchange in the heat exchanger. The heat exchanger preheats the clean water and reduces the exhaust temperature at the same time. The clean water flows back to the clean water tank through the water outlet of the heat exchanger, and the exhaust gas is discharged to the spray tower, where the exhaust gas is treated and washed in the spray tower before being discharged into the atmosphere.

[0038] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A paper machine turbine multi-stage centrifugal pump tail gas heat energy recovery system, characterized in that: It includes an exhaust gas filtering device, a heat energy recovery device, a clean water circulation device and an exhaust gas treatment device, wherein the heat energy recovery device includes a heat exchanger, the exhaust gas treatment device includes a spray tower, the exhaust gas treatment device includes a filter box and a turbine multistage centrifugal pump, the turbine multistage centrifugal pump is connected to the filter box through a pipeline, the bottom end of the heat exchanger is connected to the filter box, the top end of the heat exchanger is connected to the bottom end of the spray tower through a pipeline, and the clean water circulation device is connected to the heat exchanger through a water pipe.

2. The paper machine turbine multi-stage centrifugal pump tail gas heat recovery system according to claim 1, characterized in that: The filter box comprises an air inlet end, an air outlet end and a sewage outlet. The turbine multistage centrifugal pump is connected to the air inlet end of the filter box through a pipeline, and the air outlet end of the filter box is connected to the bottom end of the heat exchanger.

3. The paper machine turbine multi-stage centrifugal pump tail gas heat recovery system according to claim 1, characterized in that: The heat exchanger comprises a heat exchanger shell side and a heat exchanger tube side, the heat exchanger tube side comprises a heat exchanger water inlet pipe and a heat exchanger water outlet pipe, the heat exchanger water inlet pipe is arranged at the upper part of the heat exchanger, and the heat exchanger water outlet pipe is arranged at the lower part of the heat exchanger.

4. A paper machine turbine multi-stage centrifugal pump tail gas heat recovery system according to claim 3, characterized in that: The water inlet pipe of the heat exchanger includes a water inlet valve, and the water outlet pipe of the heat exchanger includes a water outlet valve. The water inlet valve and the water outlet valve are respectively installed on the water inlet and water outlet pipes.

5. The paper machine turbine multi-stage centrifugal pump tail gas heat recovery system according to claim 3, characterized in that: The bottom end of the heat exchanger is connected to the filter box, including the bottom end of the heat exchanger shell being connected to the filter box, and the top end of the heat exchanger is connected to the bottom end of the spray tower through a pipeline, including the top end of the heat exchanger shell being connected to the bottom end of the spray tower through a pipeline.

6. The paper machine turbine multi-stage centrifugal pump tail gas heat recovery system according to claim 3, characterized in that: The clean water circulation device includes a clean water tank and a clean water filter, wherein the clean water tank includes a water outlet hole and a water inlet hole, the clean water filter includes a water outlet hole and a water inlet, the water outlet hole of the clean water tank is connected to the water inlet hole of the clean water filter, the water outlet hole of the clean water filter is connected to the water inlet pipe of the heat exchanger, and the water outlet pipe of the heat exchanger is connected to the water inlet of the clean water tank.

7. A paper machine turbine multi-stage centrifugal pump tail gas heat recovery system according to claim 6, characterized in that: The clean water circulation device also includes a water pump and a flow control valve, and the water pump and the flow control valve are installed on the water pipe between the clean water filter and the clean water tank.

8. The paper machine turbine multi-stage centrifugal pump tail gas heat recovery system according to claim 6, characterized in that: The clean water filter is provided with a water flow detection device, which includes a first water flow detector and a second water flow detector. The first water flow detector and the second water flow detector are installed on the water pipe of the water inlet and the water pipe of the water outlet of the clean water filter.

9. The paper machine turbine multi-stage centrifugal pump tail gas heat energy recovery system according to claim 3, characterized in that: The exhaust gas treatment device includes a spray tower, an exhaust gas pipe and a spray device. The exhaust gas pipe is installed at the top of the spray tower. The exhaust gas in the shell of the heat exchanger is transported to the spray tower. The exhaust gas in the spray tower is transported to the outdoors through the spray tower and the exhaust gas pipe.

10. The paper machine turbine multi-stage centrifugal pump tail gas heat energy recovery system according to claim 9, characterized in that: The spray equipment comprises a spray pump, a spray pipe and a spray head. The spray pump is arranged outside the spray tower, the spray head is arranged in the upper part of the spray tower, and the two ends of the spray pipe are respectively connected to the spray pump and the spray head.

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