Paper machine and thermoelectric waste heat mutual using system
By designing a paper machine and a thermoelectric waste heat interoperability system, using low-pressure steam to heat the condensate and cooling water of the paper machine, preheated warm water of 70-80℃ is prepared and returned to the thermoelectric system, the problem of difficult to effectively utilize condensate and warm water in large paper mills is solved, and efficient energy utilization and operational cost reduction are achieved.
Patent Information
- Application Number
- CN202421401736.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The condensate water generated by large paper mills during the production process and the warm water of the thermoelectric system are difficult to effectively utilize, resulting in increased energy consumption and increased operating costs.
Design a paper machine and thermoelectric waste heat interoperability system. Through the combination of condensate tank, warm water tank and hot water supply parts, low-pressure steam heating paper machine condensed water and cooling water, prepare preheated warm water of 70-80℃, and return it to the boiler used in the thermoelectric system to reduce the cooling cost of the thermoelectric system.
By effectively utilizing the waste heat of paper machine systems and thermoelectric systems, energy consumption during the preparation and reuse of warm water is reduced, cooling costs of thermoelectric systems are saved, and operating costs are reduced.
Smart Images
Figure CN222666409U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of papermaking, and in particular relates to a paper machine and thermoelectric waste heat mutual use system. Background Art
[0002] For large paper mills, due to their large electricity consumption, in order to reduce production costs, they need to equip themselves with thermal power generating sets (thermal power systems). For thermal power systems, they will produce warm water and steam, and the paper machine system will produce a large amount of condensed water. At present, the condensed water of the paper machine system will be cooled by clean water with a temperature of about 15°C after being heated by low-pressure steam from the thermal power system. Due to the low temperature of the clean water, the temperature of the warm water after cooling is relatively low. When it is reused later, energy needs to be consumed again for heating. The circulating water of the thermal power system is more than 30°C. Under normal circumstances, it needs to be cooled before being reused. At this time, energy needs to be consumed for cooling, which leads to higher papermaking operating costs. Utility Model Content
[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a paper machine and thermoelectric waste heat mutual use system which has a simple structure and can fully utilize the waste heat of the paper machine system and the thermoelectric system to reduce costs.
[0004] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a paper machine and thermal power waste heat mutual use system, comprising a condensate tank, a warm water tank and a hot water supply part, the condensate tank having a condensate inlet, a hot water addition inlet and a hot water discharge outlet, the warm water tank having a cooling water inlet, a cooling water outlet and a heat exchange tube arranged therein, both ends of the heat exchange tube both pass out of the warm water tank, the hot water supply part having a warm water inlet, a low-pressure steam inlet and a hot water outlet, the condensate inlet of the condensate tank is used to pass the condensate of the paper machine, the hot water outlet of the hot water supply part is connected with the hot water addition inlet of the condensate tank, the hot water discharge outlet of the condensate tank is connected with one end of the heat exchange tube, the other end of the heat exchange tube is used to supply hot water to the boiler of the thermal power system, the warm water tank is used to pass cooling water, and the cooling water outlet of the warm water tank is connected with the warm water inlet of the hot water supply part.
[0005] The beneficial effect of the above technical solution is that low-pressure steam is used to heat the condensate water and cooling water of the paper machine to prepare warm water with a temperature of 70-80°C, thereby supplying preheated warm water to the boiler of the thermal power system, wherein the cooling water can come from the warm water that needs to be cooled in the thermal power system, which can save the cooling cost of the thermal power system and also reduce the preparation cost of warm water.
[0006] In the above technical solution, the two ends of the heat exchange tube are vertically spaced apart on the side wall of the warm water tank, and the end of the heat exchange tube with a lower horizontal height is connected to the hot water outlet of the condensed water tank.
[0007] The beneficial effect of the above technical solution is that the hot water in the condensate tank is cooled in the heat exchange tube to finally obtain warm water of 70-80°C, while the condensate introduced into the warm water tank is heated to 50-60°C and sent to the hot water heating element to cool the low-pressure steam so that the low-pressure steam is condensed into hot water, and the hot water after the condensation of the low-pressure steam is sent to the condensate tank and mixed with the condensate of the paper machine to obtain hot water.
[0008] The cooling water inlet of the warm water tank in the above technical solution is connected to the circulating water pipe of the thermoelectric system.
[0009] The beneficial effect of the above technical solution is that the circulating water of the thermoelectric system at a temperature between 30-40°C is sent to the warm water tank as cooling water, thereby eliminating the cost of cooling the circulating water in the thermoelectric system.
[0010] The heat exchange tube described in the above technical solution is a spiral heat exchange coil.
[0011] The beneficial effects of the above technical solution are: it has a large heat exchange area and a good heat exchange effect.
[0012] The hot water supply component in the above technical solution includes a heat exchanger and a hot water storage tank, the heat exchanger has a refrigerant inlet, a refrigerant outlet, a heat medium inlet and a heat medium outlet, the hot water storage tank has a water inlet, the refrigerant inlet, the heat medium inlet and the heat medium outlet of the heat exchanger respectively constitute the warm water inlet, low-pressure steam inlet and hot water outlet of the hot water supply component, and the refrigerant outlet of the heat exchanger is connected to the water inlet of the hot water storage tank.
[0013] The beneficial effect of the above technical solution is that the low-pressure steam can be cooled by the heat exchanger using the warm water discharged from the warm water tank, while the warm water is heated to 70-80°C and stored in the hot water storage tank.
[0014] Water temperature monitoring elements are provided on the side walls of the condensed water tank, warm water tank and hot water storage tank in the above technical solution.
[0015] The beneficial effect of the above technical solution is that the water temperature in the condensate tank, the warm water tank and the hot water storage tank can be monitored by the water temperature monitoring element respectively, so as to quickly know the water temperature in each tank.
[0016] In the above technical solution, a first flow valve is provided at the connection point between the hot water outlet of the hot water supply component and the hot water inlet of the condensed water tank.
[0017] The beneficial effect of the above technical solution is that the water temperature in the condensing water tank can be adjusted by controlling the amount of hot water delivered into the condensing water tank by the hot water supply component.
[0018] A second flow valve is provided at the cooling water inlet of the warm water tank in the above technical solution.
[0019] The beneficial effect of the above technical solution is that the temperature of the warm water delivered by the heat exchange pipe can be adjusted by adjusting the supply amount of cooling water in the warm water tank, thereby adjusting the heat exchange effect of the hot water supply component.
[0020] The water temperature monitoring element in the above technical solution is a temperature sensor, and the first flow valve and the second flow valve are both electric flow valves.
[0021] The beneficial effect of the above technical solution is that it makes the operation convenient.
[0022] The above technical solution also includes a controller, and the first flow valve, the second flow valve and a plurality of water temperature monitoring elements are all electrically connected to the controller.
[0023] The beneficial effect of the above technical solution is that it can improve the automation level of the entire paper machine and the thermal power waste heat mutual use system. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic diagram of the structure of the paper machine and the thermoelectric waste heat mutual use system according to an embodiment of the utility model;
[0025] Figure 2 This is a structural schematic diagram of a paper machine and a thermoelectric waste heat mutual use system according to an embodiment of the utility model, in which a first flow valve, a second flow valve and a water temperature monitoring element are provided;
[0026] Figure 3 Schematic diagram of electrical connection of the controller in the embodiment of the utility model.
[0027] In the figure: 1 condensate water tank; 2 warm water tank; 3 hot water supply component; 31 heat exchanger; 32 hot water storage tank; 4 heat exchange pipe; 5 water temperature monitoring element; 6 first flow valve; 7 second flow valve; 8 controller. DETAILED DESCRIPTION
[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0029] like Figure 1 As shown, this embodiment provides a paper machine and thermal power waste heat mutual use system, including a condensate tank 1, a warm water tank 2 and a hot water supply part 3, the condensate tank 1 has a condensate inlet, a hot water addition inlet and a hot water discharge outlet, the warm water tank 2 has a cooling water inlet, a cooling water outlet and a heat exchange tube 4 arranged therein, both ends of the heat exchange tube 4 are passed out of the warm water tank 2, the hot water supply part 3 has a warm water inlet, a low-pressure steam inlet and a hot water outlet, the condensate inlet of the condensate tank 1 is used to pass the condensate of the paper machine, the hot water outlet of the hot water supply part 3 is connected to the hot water addition inlet of the condensate tank 1, The hot water outlet of the condensate tank 1 is connected to one end of the heat exchange tube 4, and the other end of the heat exchange tube 4 is used to supply hot water to the boiler of the thermoelectric system. The warm water tank 2 is used to pass cooling water, and the cooling water outlet of the warm water tank 2 is connected to the warm water inlet of the hot water supply part 3. The condensate water and cooling water of the paper machine are heated by low-pressure steam to prepare warm water with a temperature of 70-80°C, thereby supplying preheated warm water to the boiler of the thermoelectric system. The cooling water can come from the warm water that needs to be cooled in the thermoelectric system, which can save the cooling cost of the thermoelectric system and reduce the preparation cost of warm water.
[0030] In this embodiment, warm water refers to water at 30° C.-90° C., and hot water refers to water at a temperature of 90° C. or above.
[0031] In this embodiment, the circulating water (temperature of more than 30°C) of the thermoelectric system can be directly used in the warm water tank as cooling water, so that the temperature of the warm water delivered by the heat exchange tube is relatively high, while the temperature of the clean water is about 15°C. The clean water is directly delivered to the thermoelectric system as circulating water, which can save energy consumption costs and improve the utilization efficiency of thermal energy.
[0032] In the above technical solution, the two ends of the heat exchange tube 4 are vertically spaced on the side wall of the warm water tank 2, and the end of the heat exchange tube 4 with a lower horizontal height is connected to the hot water outlet of the condensate water tank 1, so that the hot water in the condensate water tank is cooled in the heat exchange tube, and finally warm water of 70-80°C is obtained, and the condensed water introduced into the warm water tank is heated to 50-60°C and sent to the hot water heating element to cool the low-pressure steam so that the low-pressure steam is condensed into hot water, and the hot water after the low-pressure steam is condensed is sent to the condensate water tank and mixed with the condensate water of the paper machine to obtain hot water.
[0033] The cooling water inlet of the warm water tank 2 in the above technical solution is connected to the circulating water pipe of the thermoelectric system, so that the circulating water between 30-40°C of the thermoelectric system is sent to the warm water tank as cooling water, which can avoid the cooling cost of the circulating water in the thermoelectric system.
[0034] The heat exchange tube 4 in the above technical solution is a spiral heat exchange coil, which has a large heat exchange area and a good heat exchange effect.
[0035] The hot water supply component 3 in the above technical solution includes a heat exchanger 31 and a hot water storage tank 32, the heat exchanger 31 has a refrigerant inlet, a refrigerant outlet, a heat medium inlet and a heat medium outlet, the hot water storage tank 32 has a water inlet, the refrigerant inlet, the heat medium inlet and the heat medium outlet of the heat exchanger 31 respectively constitute the warm water inlet, the low-pressure steam inlet and the hot water outlet of the hot water supply component 3, the refrigerant outlet of the heat exchanger 31 is connected to the water inlet of the hot water storage tank 32, so that the heat exchanger can use the warm water discharged from the warm water tank to cool the low-pressure steam, and the warm water is heated to 70-80°C and stored in the hot water storage tank.
[0036] like Figure 2 As shown, water temperature monitoring elements 5 are provided on the side walls of the condensing water tank 1, the warm water tank 2 and the hot water storage tank 32 in the above technical solution, so that the water temperature in the condensing water tank, the warm water tank and the hot water storage tank can be monitored by the water temperature monitoring elements respectively, so as to quickly know the water temperature in each tank.
[0037] In the above technical solution, a first flow valve 6 is provided at the connection point between the hot water outlet of the hot water supply component 3 and the hot water inlet of the condensate water tank 1, so that the water temperature in the condensate water tank can be adjusted by controlling the amount of hot water delivered into the condensate water tank by the hot water supply component.
[0038] In the above technical solution, a second flow valve 7 is provided at the cooling water inlet of the warm water tank 2, so that the temperature of the warm water delivered by the heat exchange pipe can be adjusted by adjusting the supply amount of cooling water in the warm water tank, thereby adjusting the heat exchange effect of the hot water supply component.
[0039] The water temperature monitoring element 5 in the above technical solution is a temperature sensor, and the first flow valve 6 and the second flow valve 7 are both electric flow valves, which makes them easy to operate.
[0040] like Figure 3 As shown, the above technical solution also includes a controller 8, and the first flow valve 6, the second flow valve 7 and multiple water temperature monitoring elements 5 are all electrically connected to the controller 8, so that the degree of automation of the entire paper machine and thermal power waste heat interchange system can be improved. The controller can use an ARM series single-chip microcomputer.
[0041] in, Figure 1 and Figure 2Among them, a, b and c respectively indicate that the condensate tank 1 has a condensate inlet, a hot water inlet and a hot water outlet; d and e respectively indicate that the warm water tank 2 has a cooling water inlet and a cooling water outlet; f, g, h and i respectively indicate the heat medium inlet, heat medium outlet, refrigerant inlet and refrigerant outlet of the heat exchanger; j indicates the water inlet of the hot water pipe.
[0042] Since the temperature of low-pressure steam is relatively high, its temperature is still relatively high after condensing into liquid, so the temperature of the water in the condensation water tank will be close to boiling state, reaching above 98°C, and the temperature of the circulating water entering the warm water tank is more than 30°C. At this time, the temperature of the warm water discharged from the heat exchange tube can reach more than 70°C, and the water temperature in the warm water tank can be more than 50°C, and the water temperature in the hot water storage tank can reach about 70°C. The hot water in the hot water storage tank can supply hot water to the paper machine system, and the hot water sent out by the heat exchange tube can supply hot water to the boiler of the thermal power system.
[0043] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.
Claims
1. A paper machine and thermal power waste heat mutual use system, characterized by: The invention comprises a condensate tank (1), a warm water tank (2) and a hot water supply component (3), wherein the condensate tank (1) has a condensate inlet, a hot water inlet and a hot water outlet, the warm water tank (2) has a cooling water inlet, a cooling water outlet and a heat exchange tube (4) arranged therein, both ends of the heat exchange tube (4) are passed out of the warm water tank (2), the hot water supply component (3) has a warm water inlet, a low-pressure steam inlet and a hot water outlet, the condensate inlet of the condensate tank (1) is used to pass condensate from a paper machine, the hot water outlet of the hot water supply component (3) is connected to the hot water inlet of the condensate tank (1), the hot water outlet of the condensate tank (1) is connected to one end of the heat exchange tube (4), the other end of the heat exchange tube (4) is used to supply hot water to the boiler of the thermoelectric system, the warm water tank (2) is used to pass cooling water, and the cooling water outlet of the warm water tank (2) is connected to the warm water inlet of the hot water supply component (3).
2. The paper machine and thermal power waste heat mutual utilization system according to claim 1, characterized in that: The two ends of the heat exchange tube (4) are vertically spaced apart on the side wall of the warm water tank (2), and the end of the heat exchange tube (4) with a lower horizontal height is connected to the hot water outlet of the condensed water tank (1).
3. The paper machine and thermal power waste heat mutual utilization system according to claim 1, characterized in that: The cooling water inlet of the warm water tank (2) is connected to the circulating water pipe of the thermoelectric system.
4. The paper machine and thermal power waste heat mutual utilization system according to claim 1, characterized in that: The heat exchange tube (4) is a spiral heat exchange coil.
5. The paper machine and thermal power waste heat mutual utilization system according to claim 1, characterized in that: The hot water supply component (3) comprises a heat exchanger (31) and a hot water storage tank (32); the heat exchanger (31) has a refrigerant inlet, a refrigerant outlet, a heat medium inlet and a heat medium outlet; the hot water storage tank (32) has a water inlet; the refrigerant inlet, the heat medium inlet and the heat medium outlet of the heat exchanger (31) respectively constitute the warm water inlet, the low-pressure steam inlet and the hot water outlet of the hot water supply component (3); the refrigerant outlet of the heat exchanger (31) is connected to the water inlet of the hot water storage tank (32).
6. The paper machine and thermal power waste heat mutual utilization system according to claim 5, characterized in that: Water temperature monitoring elements (5) are provided on the side walls of the condensed water tank (1), the warm water tank (2) and the hot water storage tank (32).
7. The paper machine and thermal power waste heat mutual utilization system according to claim 6, characterized in that: A first flow valve (6) is provided at the connection point between the hot water outlet of the hot water supply component (3) and the hot water inlet of the condensed water tank (1).
8. The paper machine and thermal power waste heat mutual utilization system according to claim 7, characterized in that: A second flow valve (7) is provided at the cooling water inlet of the warm water tank (2).
9. The paper machine and thermal power waste heat mutual utilization system according to claim 8, characterized in that: The water temperature monitoring element (5) is a temperature sensor, and the first flow valve (6) and the second flow valve (7) are both electric flow valves.
10. The paper machine and thermal power waste heat mutual utilization system according to claim 9, characterized in that: It also includes a controller (8), and the first flow valve (6), the second flow valve (7) and a plurality of water temperature monitoring elements (5) are all electrically connected to the controller (8).