Process waste heat recovery and heat utilization combined supply system and method based on copper foil production

Abstract

The invention discloses a process waste heat recovery and heat utilization combined supply system and method based on copper foil production. The system comprises a first workshop copper sulfate solution cooling plate heat exchanger, a second workshop copper sulfate solution cooling plate heat exchanger, a medium-temperature heat pump, a high-temperature heat pump, a cooling water heat removal plate heat exchanger, a medium-temperature energy storage tank, a high-temperature energy storage tank, a heating water supply pipeline, a high-temperature heat pump water inlet heating plate heat exchanger, a domestic hot water heating plate heat exchanger and a first workshop copper sulfate solution heating plate heat exchanger. And a workshop copper sulfate solution heating plate heat exchanger, a standby heat source plate heat exchanger for a medium-temperature energy storage tank, a standby heat source plate heat exchanger for a high-temperature energy storage tank, an ultrasonic frequency water-based treatment unit and an ultrasonic exhaust unit. Waste of process waste heat of a copper foil factory is avoided, and the problem that the process heat is not matched with the recycled waste heat grade is solved; full-link optimization of copper foil production from energy recovery to process heat consumption is achieved, the operation load of a cooling tower is reduced, the heat exchange efficiency is improved, and the energy consumption cost of a whole plant is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery and recycling in the copper foil industry, in particular to a process waste heat recovery and heat supply system and method based on copper foil production. BACKGROUND

[0002] In the existing copper foil production process, the commonly used equipment is a copper dissolving tank, a waste liquid tank, a filter and a foil maker. The role of the copper dissolving tank is to dissolve copper plates or copper wires into copper sulfate solution. In order to improve the efficiency of copper dissolution, steam is often used to heat the solution, and the copper sulfate solution generally needs to be heated to 65-70℃. The fully dissolved copper sulfate solution will pass through the waste liquid tank, the filter, the cooling plate exchanger and the foil maker in turn under the action of the pump set. Before entering the foil maker, the copper sulfate solution needs to be cooled and then can continue to be used, and generally needs to be cooled to about 54℃. The commonly used cooling method is to use circulating cooling water to absorb the heat of the copper sulfate solution and then dissipate it to the atmosphere through a cooling tower. This cooling method not only wastes a large amount of waste heat, but also consumes a large amount of electricity and water. Especially in places where the water quality is poor, the scaling of the cooling plate exchanger will also seriously affect the cooling effect of the copper sulfate solution.

[0003] In addition, the heating and domestic hot water of the copper foil factory will also consume a large amount of energy, especially in places where the heating period is long, the energy cost of heating per year is also very high.

[0004] At present, the large waste of waste heat and the high energy cost are common phenomena in the copper foil industry. How to recover waste heat without affecting the process production and reduce energy cost is a problem that needs to be solved urgently. SUMMARY

[0005] Therefore, the present application aims to provide a process waste heat recovery and heat supply system and method based on copper foil production, which can not only avoid the waste of process waste heat in the copper foil factory, but also solve the problem of mismatch between process heat and recovered waste heat grade.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: In a first aspect, the present application provides a process waste heat recovery and heat supply system based on copper foil production, comprising: a first workshop copper sulfate solution cooling plate exchanger, a second workshop copper sulfate solution cooling plate exchanger, a medium temperature heat pump and a high temperature heat pump. The first workshop copper sulfate solution cooling plate exchanger and the second workshop copper sulfate solution cooling plate exchanger are respectively connected to a cooling water heat extraction plate exchanger through a cooling water circulation pipeline. An ultrasonic water treatment unit is arranged on the outlet pipe of the cooling water circulation pipeline, and a cooling tower is arranged on the return pipe of the cooling water circulation pipeline. The cooling water heat extraction plate heat exchanger is connected to the medium temperature heat pump and the high temperature heat pump through an integrated distribution unit, and the medium temperature heat pump and the high temperature heat pump are connected to the medium temperature energy storage tank and the high temperature energy storage tank through the integrated distribution unit. The medium temperature energy storage tank heating side outlet is connected to a heating water supply pipeline and a high temperature heat pump water inlet heating plate heat exchanger, a secondary side loop of the high temperature heat pump water inlet heating plate heat exchanger is connected to a water supply pipe between the cooling water heat extraction plate heat exchanger and the high temperature heat pump, and a primary side return water pipe of the high temperature heat pump water inlet heating plate heat exchanger and a heating return water pipeline are connected to a medium temperature energy storage tank heating side return. The high temperature energy storage tank is connected to a domestic hot water heating plate heat exchanger, a first workshop copper sulfate solution heating plate heat exchanger and a second workshop copper sulfate solution heating plate heat exchanger, and a secondary side of the first and second workshop copper sulfate solution heating plate heat exchangers is connected to a copper dissolving tank and a waste liquid tank.

[0007] Further, a standby heat source plate heat exchanger for the medium temperature energy storage tank is further included, a primary side outlet of the standby heat source plate heat exchanger is connected to a heat pump side inlet of the medium temperature energy storage tank, a primary side inlet of the standby heat source plate heat exchanger is connected to a heat pump side outlet of the medium temperature energy storage tank, a secondary side loop of the standby heat source plate heat exchanger is connected to a hot water boiler circulating water pipeline for connecting a hot water boiler, and a standby medium temperature heat source circulating pump is arranged on a pipeline between the primary side inlet of the standby heat source plate heat exchanger and the heat pump side outlet of the medium temperature energy storage tank.

[0008] Further, a standby heat source plate heat exchanger for the high temperature energy storage tank is further included, a primary side outlet of the standby heat source plate heat exchanger is connected to a heat pump side inlet of the high temperature energy storage tank, a primary side inlet of the standby heat source plate heat exchanger is connected to a heat pump side outlet of the high temperature energy storage tank, a secondary side loop of the standby heat source plate heat exchanger is connected to a steam and condensate water pipeline for connecting a steam boiler, and a standby high temperature heat source circulating pump is arranged on a pipeline between the primary side inlet of the standby heat source plate heat exchanger and the heat pump side outlet of the high temperature energy storage tank.

[0009] Further, a high temperature heat pump water inlet heating plate heat exchanger primary side circulating pump is arranged on a pipeline between a medium temperature energy storage tank heating side outlet and a high temperature heat pump water inlet heating plate heat exchanger.

[0010] Further, a pipeline between a heating return water pipeline and a medium temperature energy storage tank heating side return and a pipeline between a domestic hot water heating plate heat exchanger and a medium temperature energy storage tank heating side return are connected to a system water supply pipeline.

[0011] Further, a domestic hot water heating circulating pump is arranged on a pipeline between a high temperature energy storage tank heating side outlet and a domestic hot water heating plate heat exchanger.

[0012] Further, an ultrasonic exhaust unit is arranged on the pipeline between the high-temperature energy storage tank and the copper sulfate solution heating plate exchanger of the first workshop and the copper sulfate solution heating plate exchanger of the second workshop.

[0013] Further, a three-way electromagnetic valve is arranged on the loop between the high-temperature energy storage tank and the copper sulfate solution heating plate exchanger of the first workshop and the copper sulfate solution heating plate exchanger of the second workshop, and the three-way electromagnetic valve is located downstream of the ultrasonic exhaust unit.

[0014] In a second aspect, the present application provides a process waste heat recovery and heat supply method based on copper foil production, comprising the following steps: (1) The copper sulfate solution cooling circulating water waste heat is extracted through a cooling water heat extraction plate exchanger, and the heat extraction circulating water is divided into two paths and supplied to a medium-temperature heat pump and a high-temperature heat pump through an integrated delivery and distribution unit, the medium-temperature heat pump heats the heat extraction circulating water waste heat to 60-70℃, and the heat is stored in a medium-temperature energy storage tank through the integrated delivery and distribution unit, and is supplied to heating and high-temperature heat pump water inlet preheating; wherein, The maximum heating load of the medium-temperature heat pump is: , The maximum heating load is , , The unit is kW; The water supply heating load of the medium-temperature heat pump to the high-temperature heat pump is , wherein, The water supply flow rate of the high-temperature heat pump is m 3 / h, The maximum heating temperature difference of the water supply of the high-temperature heat pump is ℃; The water supply flow rate of the medium-temperature heat pump waste heat side is: , The required waste heat load of the medium-temperature heat pump is T1 is the water supply temperature of the heat extraction circulating water, and T2 is the return water temperature of the heat extraction circulating water; The water supply flow rate of the medium-temperature heat pump water supply preheating to the high-temperature heat pump is: T3 is the water supply temperature of the medium-temperature heat pump heat supply side, and T4 is the return water temperature of the medium-temperature heat pump heat supply side; The water supply flow rate of the heating is: ; The required waste heat load of the medium-temperature heat pump is ; The required electric power of the medium-temperature heat pump during operation is: ; The energy efficiency ratio of the medium-temperature heat pump is determined by T2 and T3: ; (2) The high-temperature heat pump preheats the water to 85-95℃, and the preheated water is stored in the high-temperature energy storage tank through the integrated delivery and distribution unit, and is used to supply hot water for dormitories and to heat copper sulfate solution; wherein, The maximum heating load of the high-temperature heat pump is: Q3 is the heating load of the hot water for dormitories, Q4 is the heating load of the copper sulfate solution for a single production line in Workshop 1, and n1 is the number of production lines in Workshop 1; Q5 is the heating load of the copper sulfate solution for a single production line in Workshop 2, and n2 is the number of production lines in Workshop 2, and the units of Q3, Q4 and Q5 are kW; The water supply flow rate of the hot water for dormitories is: T5 is the water supply temperature of the high-temperature heat pump, and T6 is the return water temperature of the high-temperature heat pump; The total water supply flow rate of the copper sulfate solution for Workshop 1 is: ; The total water supply flow rate of the copper sulfate solution for Workshop 2 is: ; The electric power required for the operation of the high-temperature heat pump is: ; The energy efficiency ratio of the high-temperature heat pump is determined by T2 and T5: ; The required waste heat load of the high-temperature heat pump is: .

[0015] The water supply flow rate of the high-temperature heat pump on the waste heat side is:

[0016] Further, the medium-temperature heat pump adopts a screw heat pump, and the high-temperature heat pump adopts a centrifugal heat pump, and the cooperative operation of the medium-temperature heat pump and the high-temperature heat pump satisfies: P m，p + P h，p ≤0.9P 总电网容量 .

[0017] Further, the maximum heating temperature difference of the water supply of the high-temperature heat pump is dynamically adjusted according to the following formula: Δt m =min(15,T3−max(T2,40)).

[0018] Further, the standby heat source linkage control is as follows: when the temperature of the medium-temperature energy storage tank is less than 65℃, start the hot water boiler; when the temperature of the high-temperature energy storage tank is less than 85℃ and the following conditions are met, start the steam boiler: ; Further, the number N of water pumps of the integrated delivery and distribution unit satisfies: , Q 总max is the maximum design flow rate of the system.

[0019] Further, during the extraction of copper sulfate solution cooling circulating water waste heat by the cooling water heat extraction plate, the circulating water in the circulating pipeline is treated by the ultrasonic frequency water treatment unit, the operation frequency f of the ultrasonic frequency water treatment unit satisfies: , the unit of f is kHz, is the concentration of calcium ions, the unit is mg / L.

[0020] Compared with the prior art, the beneficial technical effects of the present application are: (1) The present application constructs a closed-loop system of "waste heat grade improvement-multi-stage heat energy distribution-dynamic load response", which not only avoids the waste of copper foil factory process waste heat, but also solves the problem of mismatch between process heat and recovered waste heat grade; realizes the full-link optimization of copper foil production from energy recovery to process heat, which not only recovers the cooling water waste heat of the copper foil factory, but also heats the copper sulfate solution, supplies heating and domestic hot water, reduces the operation load of the cooling tower, improves the heat exchange efficiency, and reduces the energy consumption cost of the whole factory. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a process waste heat recovery and combined heat supply system based on copper foil production of the present application; The drawing label: 1-cooling tower of workshop 1, 2-copper sulfate solution cooling plate of workshop 1, 3-copper sulfate solution cooling plate of workshop 2, 4-cooling tower of workshop 2, 5-ultrasonic frequency water treatment unit, 6-cooling water heat extraction plate, 7-integrated delivery unit, 8-back-up medium-temperature heat source circulating pump, 9-high-temperature heat pump water inlet heating plate primary side circulating pump, 10-medium-temperature energy storage tank with back-up heat source plate, 11-medium-temperature energy storage tank, 12-system water supply pipeline, 13-high-temperature heat pump water inlet heating plate, 14-hot water boiler circulating water pipeline, 15-high-temperature heat pump, 16-high-temperature energy storage tank with back-up heat source plate, 17-steam and condensate water pipeline, 18-back-up high-temperature heat source circulating pump, 19-high-temperature energy storage tank, 20-heating water supply pipeline, 21-domestic hot water heating circulating pump, 22-domestic hot water heating plate, 23-ultrasonic exhaust unit, 24-three-way electromagnetic valve, 25-copper sulfate solution heating plate of workshop 1, 26-copper sulfate solution heating plate of workshop 2, 27-copper dissolving tank, 28-polluted liquid tank, 29-medium-temperature heat pump. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0023] Example 1 like Figure 1 As shown, this embodiment provides a process waste heat recovery and heat supply system based on copper foil production, including: a copper sulfate solution cooling plate exchanger 2 in the first workshop, a copper sulfate solution cooling plate exchanger 3 in the second workshop, a medium-temperature heat pump 29, and a high-temperature heat pump 15; the copper sulfate solution cooling plate exchanger 2 in the first workshop and the copper sulfate solution cooling plate exchanger 3 in the second workshop are respectively connected to the cooling water heat exchanger 6 through a cooling water circulation pipeline, an ultrasonic frequency aqueous treatment unit 5 is provided on the outlet pipe of the cooling water circulation pipeline, and a cooling tower is provided on the return pipe of the cooling water circulation pipeline; the cooling water heat exchanger 6 is respectively connected to the medium-temperature heat pump 29 and the high-temperature heat pump 15 through an integrated transmission and distribution unit 7, and the medium-temperature heat pump 29 and the high-temperature heat pump 15 are respectively connected to the medium-temperature energy storage tank 11 and the high-temperature heat pump 15 through the integrated transmission and distribution unit 7. high-temperature energy storage tank 19; the water outlet end on the heating side of the medium-temperature energy storage tank 11 is respectively connected to the heating water supply pipeline 20 and the high-temperature heat pump water inlet heating plate exchange 13, and the secondary side circuit of the high-temperature heat pump water inlet heating plate exchange 13 is connected to the water supply pipe between the cooling water heat plate exchange 6 and the high-temperature heat pump 15, and the primary side return pipe and the heating return pipe of the high-temperature heat pump water inlet heating plate exchange 13 are both connected to the return water end on the heating side of the medium-temperature energy storage tank 11; the high-temperature energy storage tank 19 is respectively connected to the domestic hot water heating plate exchange 22, the copper sulfate solution heating plate exchange 25 of the first workshop, and the copper sulfate solution heating plate exchange 26 of the second workshop, and the secondary sides of the copper sulfate solution heating plate exchange 25 of the first workshop and the copper sulfate solution heating plate exchange 26 of the second workshop are respectively connected to the copper dissolving tank 27 and the sewage tank 28.

[0024] Since the temperature of the cooling circulating water used to cool the copper sulfate solution in the copper foil factory is relatively high, the upper tower temperature of the cooling tower is 50°C and the lower tower temperature is 40°C. However, the temperature of the cooling circulating water used to cool other equipment (such as rectifier cabinets) is relatively low, generally at 30°C. To ensure a relatively high heat extraction temperature, the system of this embodiment extracts heat from the cooling circulating water main pipeline used to cool the copper sulfate solution.

[0025] Considering the poor water quality of the open cooling tower, it cannot directly enter the high-temperature heat pump 15; at the same time, the copper sulfate solution exchanges heat with the cooling circulating water through the copper sulfate solution cooling plate exchanger. In order to avoid the risk of acid cross-contamination to a greater extent, heat is taken out through the cooling water heat exchanger 6.

[0026] By installing the ultrasonic frequency aqueous treatment unit 5, scaling of the copper sulfate solution cooling plate exchanger and the cooling water heat extraction plate exchanger 6 is avoided, which affects the heat exchange efficiency.

[0027] Specifically, the system further comprises a standby heat source plate exchanger 10 for the medium-temperature energy storage tank, a primary side outlet of the standby heat source plate exchanger 10 for the medium-temperature energy storage tank is connected with a heat pump side inlet of the medium-temperature energy storage tank 11, a primary side inlet of the standby heat source plate exchanger 10 for the medium-temperature energy storage tank is connected with a heat pump side outlet of the medium-temperature energy storage tank 11, a secondary side loop of the standby heat source plate exchanger 10 for the medium-temperature energy storage tank is connected with a hot water boiler circulating water pipeline 14 for connecting a hot water boiler, and a standby medium-temperature heat source circulating pump 8 is arranged on a pipeline between the primary side inlet of the standby heat source plate exchanger 10 for the medium-temperature energy storage tank and the heat pump side outlet of the medium-temperature energy storage tank 11. Considering that the heating load fluctuates greatly during the heating period, the hot water boiler is used as the standby heat source. When the heat load of the medium-temperature energy storage tank 11 suddenly increases or the waste heat load is small, the standby heat source starts to work, so that the temperature of the hot water in the medium-temperature energy storage tank 11 is always greater than or equal to a set value (60-70℃).

[0028] Specifically, the system further comprises a standby heat source plate exchanger 16 for the high-temperature energy storage tank, a primary side outlet of the standby heat source plate exchanger 16 for the high-temperature energy storage tank is connected with a heat pump side inlet of the high-temperature energy storage tank 19, a primary side inlet of the standby heat source plate exchanger 16 for the high-temperature energy storage tank is connected with a heat pump side outlet of the high-temperature energy storage tank 19, a secondary side loop of the standby heat source plate exchanger 16 for the high-temperature energy storage tank is connected with a steam and condensate water pipeline 17 for connecting a steam boiler, and a standby high-temperature heat source circulating pump 18 is arranged on a pipeline between the primary side inlet of the standby heat source plate exchanger 16 for the high-temperature energy storage tank and the heat pump side outlet of the high-temperature energy storage tank 19.

[0029] During the operation of the first workshop and the second workshop, the following situations may exist: (1) The first workshop and the second workshop are restarted after a period of complete shutdown, and there is no waste heat of cooling water in a short time; (2) Some production lines of the first workshop and the second workshop are in operation, and some production lines are shut down. The copper sulfate solution in the shut-down production line does not need to be cooled by cooling water, but it still needs to be heated in order to prevent the crystallization of the residual copper sulfate solution in the pipeline. At this time, the waste heat of the cooling water is small; (3) The production capacity of the first workshop and the second workshop suddenly increases, but the waste heat of the cooling water is small in a short time; In order to cope with the above situations and ensure the stability of the system, the steam boiler is used as the standby heat source of the high-temperature energy storage tank 19. When the waste heat is small and the heat load is large, the standby heat source starts to work, so that the temperature of the water supply in the high-temperature energy storage tank 19 is always higher than or equal to a set value, thereby ensuring the stability of the process production.

[0030] Specifically, a high-temperature heat pump water inlet heating plate heat exchanger first side circulating pump 9 is arranged on a pipeline between the heat supply side outlet water end of the medium-temperature energy storage tank 11 and the high-temperature heat pump water inlet heating plate heat exchanger 13; a pipeline between a heating return water pipeline and the heat supply side return water end of the medium-temperature energy storage tank 11 and a pipeline between the domestic hot water heating plate heat exchanger 22 and the heat supply side return water end of the high-temperature energy storage tank 19 are connected with the system water supplement pipeline 12; a domestic hot water heating circulating pump 21 is arranged on a pipeline between the heat supply side outlet water end of the high-temperature energy storage tank 19 and the domestic hot water heating plate heat exchanger 22.

[0031] Specifically, an ultrasonic exhaust unit 23 is arranged on a pipeline between the heat supply side outlet water end of the high-temperature energy storage tank 19 and a first workshop copper sulfate solution heating plate heat exchanger 25 and a second workshop copper sulfate solution heating plate heat exchanger 26; a three-way electromagnetic valve 24 is arranged on a loop between the high-temperature energy storage tank 19 and the first workshop copper sulfate solution heating plate heat exchanger 25 and the second workshop copper sulfate solution heating plate heat exchanger 26, and the three-way electromagnetic valve 24 is located downstream of the ultrasonic exhaust unit 23.

[0032] Because the water supply temperature of the first workshop and the second workshop is high, and the system is a closed circulation system, in order to avoid problems such as heat transfer efficiency reduction, water pump cavitation, pipeline oxidation corrosion, and operation cost increase caused by the system being unable to exhaust in time, an ultrasonic exhaust unit 23 is arranged in the main pipeline of the closed circulation system of the first workshop and the second workshop.

[0033] Embodiment 2 On the basis of embodiment 1, the embodiment provides a process waste heat recovery and heat supply method based on copper foil production, including the following steps: (1) Extracting copper sulfate solution cooling circulating water waste heat through the cooling water heat extraction plate heat exchanger 6, and supplying the extracted heat circulating water to the medium-temperature heat pump 29 and the high-temperature heat pump 15 through an integrated delivery and distribution unit 7 in two ways, wherein the medium-temperature heat pump 29 heats the extracted heat circulating water to 60-70°C, and stores the heated water in the medium-temperature energy storage tank 11 through the integrated delivery and distribution unit 7, and supplies the water to heating and preheats the water inlet of the high-temperature heat pump 15; wherein, The maximum heating load of the medium-temperature heat pump 29 is: , The maximum heating load is, , , The unit is kW; The water supply heating load of the medium-temperature heat pump 29 to the high-temperature heat pump 15 is , wherein, The water supply flow of the high-temperature heat pump 15 is m 3 / h, The maximum heating temperature difference of the water supply of the high-temperature heat pump 15 is °C; The water supply flow of the medium-temperature heat pump 29 on the waste heat side is: , The required residual heat load of the medium-temperature heat pump 29 is The water supply flow rate preheated by the medium-temperature heat pump 29 for the high-temperature heat pump 15 is , T3 is the water supply temperature on the heating side of the medium-temperature heat pump 29, and T4 is the return water temperature on the heating side of the medium-temperature heat pump 29; The water supply flow rate for heating is ; The required residual heat load of the medium-temperature heat pump 29 is ; The required electric power of the medium-temperature heat pump 29 when operating is ; The energy efficiency ratio of the medium-temperature heat pump 29 is Determined by T2 and T3: ; (2) The high-temperature heat pump 15 raises the residual heat or the preheated water of the medium-temperature heat pump 29 to 85-95℃, and stores it in the high-temperature energy storage tank through the integrated heat supply and distribution unit 7, to supply hot water and copper sulfate solution for heating in the dormitory; wherein, The maximum heating load of the high-temperature heat pump 15 is , Q3 is the heating load of the hot water in the dormitory, Q4 is the heating load of the copper sulfate solution of a single production line in the first workshop, n1 is the number of production lines in the first workshop, Q5 is the heating load of the copper sulfate solution of a single production line in the second workshop, n2 is the number of production lines in the second workshop, and the units of Q3, Q4 and Q5 are kW; The water supply flow rate of the hot water in the dormitory is , T5 is the water supply temperature on the heating side of the high-temperature heat pump 15, and T6 is the return water temperature on the heating side of the high-temperature heat pump 15; The total water supply flow rate for heating the copper sulfate solution in the first workshop is ; The total water supply flow rate for heating the copper sulfate solution in the second workshop is ; The required electric power of the high-temperature heat pump 15 when operating is ; The energy efficiency ratio of the high-temperature heat pump 15 is Determined by T2 and T5: ; The required residual heat load of the high-temperature heat pump 15 is .

[0034] The water supply flow rate on the residual heat side of the high-temperature heat pump is

[0035] Specifically, the medium-temperature heat pump 29 adopts a screw heat pump, the high-temperature heat pump adopts a centrifugal heat pump, and the cooperative operation of the medium-temperature heat pump 29 and the high-temperature heat pump 15 satisfies P m，p + Ph，p ≤0.9P 总电网容量 .

[0036] Specifically, the maximum heating temperature difference of the high-temperature heat pump 15 for water supply is dynamically adjusted according to the following formula: Δt m = min (15, T3 - max (T2, 40)).

[0037] Specifically, in order to ensure the stability of the process production, the standby heat source linkage control is started when the temperature of the medium-temperature energy storage tank 11 is <65℃, the hot water boiler is started when the temperature of the high-temperature energy storage tank 19 is <85℃ and the following conditions are met: ; Specifically, a plurality of circulating water pumps are arranged in the integrated delivery and distribution unit 7, the circulating water pump has the highest energy efficiency when it operates at 80% of its maximum load, and the specific flow of the circulating water pump is determined after detailed calculation according to the fluctuation degree of the load. The number N of circulating water pumps of the integrated delivery and distribution unit 7 satisfies: , Q 总max is the maximum design flow of the system.

[0038] Specifically, during the extraction of the copper sulfate solution cooling circulating water waste heat by the cooling water heat extraction plate 6, the circulating water in the circulating water pipeline is treated by the ultrasonic frequency water treatment unit 5, and the operating frequency f of the ultrasonic frequency water treatment unit 5 satisfies: , the unit of f is kHz, is the calcium ion concentration, the unit is mg / L.

[0039] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the technical scheme and concept of the present application shall be included in the protection scope of the present application.

Claims

1. A process waste heat recovery and heat supply system based on copper foil production, characterized in that: include: The first workshop has copper sulfate solution cooling plate heat exchanger, the second workshop has copper sulfate solution cooling plate heat exchanger, medium temperature heat pump, high temperature heat pump; The copper sulfate solution cooling plate heat exchanger in workshop 1 and workshop 2 are connected to the cooling water heat exchanger through cooling water circulation pipelines. The outlet pipes of the cooling water circulation pipelines are equipped with ultrasonic water treatment units, and the return pipes of the cooling water circulation pipelines are equipped with cooling towers. The cooling water heat exchanger is connected to the medium-temperature heat pump and the high-temperature heat pump through the integrated transmission and distribution unit. The medium-temperature heat pump and the high-temperature heat pump are connected to the medium-temperature energy storage tank and the high-temperature energy storage tank through the integrated transmission and distribution unit respectively. The water outlet end of the heating side of the medium-temperature energy storage tank is connected to the heating water supply pipeline and the high-temperature heat pump water inlet heating plate exchanger. The secondary side circuit of the high-temperature heat pump water inlet heating plate exchanger is connected to the water supply pipe between the cooling water heat plate exchanger and the high-temperature heat pump. The primary side return pipe of the high-temperature heat pump water inlet heating plate exchanger and the heating return pipe are both connected to the return water end of the heating side of the medium-temperature energy storage tank; The high-temperature energy storage tank is respectively connected to the domestic hot water heating plate exchanger, the copper sulfate solution heating plate exchanger in the first workshop, and the copper sulfate solution heating plate exchanger in the second workshop. The secondary sides of the copper sulfate solution heating plate exchanger in the first workshop and the copper sulfate solution heating plate exchanger in the second workshop are respectively connected to the copper dissolving tank and the sewage tank.

2. The process waste heat recovery and heat supply system based on copper foil production according to claim 1 is characterized in that: It also includes replacing the medium-temperature energy storage tank with a spare heat source plate and replacing the high-temperature energy storage tank with a spare heat source plate; The primary side water outlet of the medium temperature energy storage tank replaced by the spare heat source plate is connected to the water inlet on the heat pump side of the medium temperature energy storage tank, the primary side water inlet of the medium temperature energy storage tank replaced by the spare heat source plate is connected to the water outlet on the heat pump side of the medium temperature energy storage tank, the secondary side circuit of the medium temperature energy storage tank replaced by the spare heat source plate is connected to the hot water boiler circulating water pipeline for connecting the hot water boiler, and a spare medium temperature heat source circulating pump is arranged on the pipeline between the primary side water inlet of the medium temperature energy storage tank replaced by the spare heat source plate and the water outlet on the heat pump side of the medium temperature energy storage tank ; The primary side water outlet of the high-temperature energy storage tank replaced by a spare heat source plate is connected to the water inlet on the heat pump side of the high-temperature energy storage tank, the primary side water inlet of the high-temperature energy storage tank replaced by a spare heat source plate is connected to the water outlet on the heat pump side of the high-temperature energy storage tank, the secondary side circuit of the high-temperature energy storage tank replaced by a spare heat source plate is connected with a steam and condensate pipeline for connecting to the steam boiler, and a spare high-temperature heat source circulation pump is arranged on the pipeline between the primary side water inlet of the high-temperature energy storage tank replaced by a spare heat source plate and the water outlet on the heat pump side of the high-temperature energy storage tank.

3. The process waste heat recovery and heat supply system based on copper foil production according to claim 2 is characterized in that: A high-temperature heat pump inlet heating plate exchanger primary side circulation pump is installed on the pipeline between the water outlet end on the heating side of the medium-temperature energy storage tank and the high-temperature heat pump inlet heating plate exchanger; the pipeline between the heating return pipeline and the return water end on the heating side of the medium-temperature energy storage tank, and the pipeline between the domestic hot water heating plate exchanger and the return water end on the heating side of the high-temperature energy storage tank are all connected to the system water supply pipeline; a domestic hot water heating circulation pump is installed on the pipeline between the water outlet end on the heating side of the high-temperature energy storage tank and the domestic hot water heating plate exchanger.

4. The waste heat recovery and heat supply system based on copper foil production according to claim 3 is characterized in that: Ultrasonic exhaust units are installed on the pipelines between the water outlet end on the heating side of the high-temperature energy storage tank and the copper sulfate solution heating plate exchanger in the first workshop and the copper sulfate solution heating plate exchanger in the second workshop; three-way solenoid valves are installed on the circuits between the high-temperature energy storage tank and the copper sulfate solution heating plate exchanger in the first workshop and the copper sulfate solution heating plate exchanger in the second workshop, and the three-way solenoid valves are located downstream of the ultrasonic exhaust units.

5. A method for recovering waste heat from copper foil production and providing heat, characterized in that: The process waste heat recovery and heat supply system based on copper foil production according to any one of claims 1 to 4 specifically comprises the following steps: (1) The waste heat of the cooling circulating water of the copper sulfate solution is extracted through the cooling water heat exchange plate. The heat circulating water is supplied to the medium-temperature heat pump and the high-temperature heat pump respectively through the integrated transmission and distribution unit. The medium-temperature heat pump heats the waste heat of the heat circulating water to 60℃-70℃ and stores it in the medium-temperature energy storage tank through the integrated transmission and distribution unit to supply heating and preheating the high-temperature heat pump inlet water; Among them, the maximum heating load of the medium-temperature heat pump is: Q m,p =Q1+Q2, Q1 is the maximum heating load, Q1, Q2, Q m,p The unit is kW; Q2 is the water heating load of the medium temperature heat pump to the high temperature heat pump, Q2=1.16q2Δt m , where q2 is the high temperature heat pump water flow rate, m 3 / h, Δt m Maximum heating temperature difference for high temperature heat pump water supply, °C; The water supply flow rate on the waste heat side of the medium temperature heat pump is: Q w,m,p is the waste heat load required by the medium temperature heat pump, T1 is the supply temperature of the heat circulation water, and T2 is the return temperature of the heat circulation water; The water flow rate of the medium temperature heat pump to preheat the high temperature heat pump is: T3 is the water supply temperature on the heating side of the medium temperature heat pump, and T4 is the return water temperature on the heating side of the medium temperature heat pump; The water flow rate for heating is: The waste heat load required by the medium temperature heat pump is Q w,m,p =Q m,p -P m,p ; The electric power required when the medium temperature heat pump is running is: Medium temperature heat pump energy efficiency ratio COP m,p Determined by T2 and T3: COP m,p =f(T2,T3); (2) The high-temperature heat pump heats the waste heat or medium-temperature heat pump preheated water to 85°C-95°C, and stores it in a high-temperature energy storage tank through an integrated transmission and distribution unit to supply hot water to the dormitory and copper sulfate solution for heating; The maximum heating load of the high temperature heat pump is: Q h,p =Q3+n1×Q4+n2×Q5, where Q3 is the heating load of dormitory hot water, Q4 is the heating load of copper sulfate solution on a single production line in workshop 1, n1 is the number of production lines in workshop 1; Q5 is the heating load of copper sulfate solution on a single production line in workshop 2, n2 is the number of production lines in workshop 2, and the units of Q3, Q4, and Q5 are all kW; The water supply flow rate of dormitory hot water is: T5 is the water supply temperature of the high-temperature heat pump on the heating side, and T6 is the return water temperature of the high-temperature heat pump on the heating side; The total water flow for heating copper sulfate solution in workshop 1 is: The total water flow for heating copper sulfate solution in workshop 2 is: The electric power required when the high temperature heat pump is running is: High temperature heat pump energy efficiency ratio COP h,p Determined by T2 and T5: COP h,p =f(T2,T5); The waste heat load required by the high temperature heat pump is: Q w,h,p =Q h,p -P h,p ; The water supply flow rate on the waste heat side of the high-temperature heat pump is:

6. The method for recovering waste heat and providing heat for copper foil production according to claim 5, characterized in that: The medium temperature heat pump adopts a screw heat pump, and the high temperature heat pump adopts a centrifugal heat pump. The coordinated operation of the medium temperature heat pump and the high temperature heat pump meets the following requirements: m，p +P h，p ≤0.9P 总电网容量 .

7. The method for recovering waste heat and providing heat for copper foil production according to claim 5, characterized in that: The maximum heating temperature difference Δt of the high-temperature heat pump water supply m Dynamic adjustment according to the following formula: Δtm=min(15,T3-max(T2,40)).

8. The method for recovering waste heat and providing heat for copper foil production according to claim 5, characterized in that: Backup heat source linkage control: When the temperature of the medium-temperature energy storage tank is less than 65°C, the hot water boiler is started; when the temperature of the high-temperature energy storage tank is less than 85°C and the following conditions are met, the steam boiler is started:

9. The method for recovering waste heat and providing heat for copper foil production according to claim 5, characterized in that: The number N of water pumps configured in the integrated transmission and distribution unit satisfies: Q 总max It is the maximum design flow of the system.

10. The method for recovering waste heat and providing heat for copper foil production according to claim 5, characterized in that: During the period when the cooling water heat exchanger extracts the waste heat of the copper sulfate solution cooling circulating water, the ultrasonic frequency water treatment unit is used to treat the circulating water in the cooling water circulation pipeline. The operating frequency f of the ultrasonic frequency water treatment unit meets the following requirements: The unit of f is kHz, and ρ is the calcium ion concentration in mg / L.

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