Hot water combined supply process system

Abstract

The utility model discloses a hot water combined supply process system which comprises a large water tank and a small water tank, water outlets of the large water tank and the small water tank are connected with a production equipment circulating water pump, and water inlets of the large water tank and the small water tank are connected with a water outlet of a hot water heat exchanger. A water inlet of the hot water heat exchanger is connected with the other water outlet of the small water tank and the other water outlet of the large water tank, a production equipment water return circulating pipeline is arranged between the other water inlet of the large water tank and the other water inlet of the small water tank, and the small water tank is connected with the gas-fired hot water boiler through a boiler circulating water supply pipeline and a boiler circulating water return pipeline. The gas-water heat exchanger is added to exhaust smoke of the RTO heat storage combustion device for heat energy recovery, the combination of the large water tank and the small water tank and an electric three-way regulating valve switching pipeline system achieve sufficient heat storage, meanwhile, the hot water boiler is matched, when recovered heat is insufficient, rapid temperature rise is achieved, and the heat energy is saved. The process requirements of production equipment are met; the heat energy utilization rate is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery of RTO thermal storage combustion devices and relates to a hot water joint supply process system. Background Art

[0002] At present, the VOCs emitted by the production equipment in the flexible packaging industry are burned in the RTO heat storage combustion device, and the flue gas emitted is used to recover high-temperature hot water for oven heating of the production equipment. After heating, the water temperature drops and flows back to the hot water heating system. It is heated by the RTO exhaust gas heat exchanger and then recycled. The design temperature of the supply and return water in the flexible packaging industry is 90 / 70℃.

[0003] Due to production process requirements, the flexible packaging industry needs to set up an oven to dry the solvent on the printed film. According to environmental protection requirements, the VOCs waste gas generated by drying must be burned in the RTO thermal storage combustion device before it can be discharged into the atmosphere. The temperature of the flue gas after combustion is about 100-200℃.

[0004] In the prior art, the flue gas after burning VOCs is directly discharged into the atmosphere, or a simple hot water recovery device is added, which does not fully recover the heat energy and causes heat energy waste. At the same time, the hot water temperature rises slowly, affecting the user's production heat demand. Utility Model Content

[0005] The utility model aims to provide a hot water joint supply process system, which solves the problem of low thermal energy utilization rate in the prior art.

[0006] The technical solution adopted by the utility model is a hot water joint supply process system, comprising a large water tank and a small water tank, the water outlets of the large water tank and the small water tank are connected to a circulating water pump of production equipment, the water inlets of the large water tank and the small water tank are connected to a water outlet of a hot water heat exchanger, the water inlet of the hot water heat exchanger is respectively connected to another water outlet of the small water tank and another water outlet of the large water tank, a return water circulation pipeline of production equipment is arranged between another water inlet of the large water tank and another water inlet of the small water tank, and the small water tank is respectively connected to a gas hot water boiler through a boiler circulating water supply pipeline and a boiler circulating water return pipeline.

[0007] The utility model is also characterized in that:

[0008] The hot water heat exchanger is connected to the RTO through the RTO exhaust pipe, and the hot water heat exchanger is also connected to a chimney and a cooling fan.

[0009] The large water tank is connected with a large water tank supporting water softening device, and the small water tank is connected with a small water tank supporting water softening device.

[0010] A water outlet of the large water tank is connected to a circulating water pump of the production equipment through a water supply circulation pipeline of the production equipment. An electric three-way regulating valve for water supply of the production equipment is arranged on the water supply circulation pipeline of the production equipment. The electric three-way regulating valve for water supply of the production equipment is connected to a water outlet of the small water tank through a pipeline.

[0011] The other water outlet of the large water tank is connected to the hot water heat exchanger through a hot water circulation water supply pipeline. The hot water circulation water supply pipeline is sequentially provided with a water supply electric three-way regulating valve and a hot water circulation water pump from the large water tank to the hot water heat exchanger. The water supply electric three-way regulating valve is connected to the other water outlet of the small water tank through a pipeline.

[0012] An electric three-way regulating valve for production equipment return water is provided on the return water circulation pipeline of the production equipment.

[0013] The hot water heat exchanger outlet is connected to the water inlet of the small water tank through a hot water circulation return pipeline. A return water electric three-way regulating valve is arranged on the hot water circulation return pipeline. The return water electric three-way regulating valve is connected to the water inlet of the large water tank through a pipeline.

[0014] The beneficial effects of the utility model are:

[0015] The utility model relates to a hot water combined supply process system, which adds an air-water heat exchanger to the exhaust gas of the RTO thermal storage combustion device to recover heat energy. The large and small water tank combinations and the electric three-way regulating valve switching pipeline system realize sufficient heat storage and heat accumulation. At the same time, a hot water boiler is provided to realize rapid heating when the recovered heat is insufficient, thereby meeting the process requirements of the production equipment and improving the utilization rate of thermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the hot water combined supply process system of the utility model.

[0017] In the figure, 1. RTO exhaust duct; 2. hot water heat exchanger; 3. cooling fan; 4. hot water circulation water supply pipeline; 5. hot water circulation return pipeline; 6. hot water circulation water pump; 7. water supply electric three-way regulating valve; 8. return water electric three-way regulating valve; 9. small water tank; 10. large water tank; 11. large water tank supporting softening device; 12. small water tank supporting softening device; 13. boiler circulation water pump; 14. gas hot water boiler; 15. boiler circulation water supply pipeline; 16. boiler circulation return pipeline; 17. production equipment circulation water pump; 18. production equipment water supply electric three-way regulating valve; 19. production equipment return water electric three-way regulating valve; 20. production equipment water supply circulation pipeline; 21. production equipment return circulation pipeline; 22. chimney. DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0019] Example 1

[0020] This embodiment provides a hot water co-supply process system, such as Figure 1 As shown, it includes a large water tank 10 and a small water tank 9, the water outlets of the large water tank 10 and the small water tank 9 are connected to the production equipment circulating water pump 17, the water inlets of the large water tank 10 and the small water tank 9 are connected to the water outlet of the hot water heat exchanger 2, the water inlet of the hot water heat exchanger 2 is respectively connected to the other water outlet of the small water tank 9 and the other water outlet of the large water tank 10, a production equipment return water circulation pipeline 21 is arranged between the other water inlet of the large water tank 10 and the other water inlet of the small water tank 9, and the production equipment A production equipment return water electric three-way regulating valve 19 is provided on the spare return water circulation pipeline 21, the small water tank 9 is connected to the gas hot water boiler 14 through the boiler circulation water supply pipeline 15 and the boiler circulation return water pipeline 16 respectively, a boiler circulation water pump 13 is provided on the boiler circulation water supply pipeline 15, the hot water heat exchanger 2 is connected to the RTO through the RTO exhaust pipe 1, the hot water heat exchanger 2 is also connected to the chimney 22 and the cooling fan 3, and the smoke of the hot water heat exchanger 2 is discharged to the chimney 22.

[0021] Example 2

[0022] This embodiment provides a hot water co-supply process system. Based on Embodiment 1, the large water tank 10 is connected to a large water tank supporting softening device 11, and the small water tank 9 is connected to a small water tank supporting softening device 12.

[0023] Example 3

[0024] This embodiment provides a hot water co-supply process system. On the basis of Embodiment 1-2, a water outlet of a large water tank 10 is connected to a production equipment circulating water pump 17 through a production equipment water supply circulation pipeline 20. A production equipment water supply electric three-way regulating valve 18 is provided on the production equipment water supply circulation pipeline 20. The production equipment water supply electric three-way regulating valve 18 is connected to a water outlet of a small water tank 9 through a pipeline.

[0025] The other water outlet of the large water tank 10 is connected to the hot water heat exchanger 2 through the hot water circulation water supply pipeline 4. The hot water circulation water supply pipeline 4 is provided with a water supply electric three-way regulating valve 7 and a hot water circulation water pump 6 in sequence from the large water tank 10 to the hot water heat exchanger 2. The water supply electric three-way regulating valve 7 is connected to the other water outlet of the small water tank 9 through a pipeline.

[0026] The water outlet of the hot water heat exchanger 2 is connected to the water inlet of the small water tank 9 through the hot water circulation return pipe 5. The hot water circulation return pipe 5 is provided with a return electric three-way regulating valve 8. The return electric three-way regulating valve 8 is connected to the water inlet of the large water tank 10 through a pipeline. The water in the small water tank 9 is sent to the water side of the hot water heat exchanger 2 through the hot water circulation water pump 6 and the water supply electric three-way regulating valve 7, and indirectly exchanges heat with the RTO exhaust flue gas. The water is returned to the small water tank 9 after being heated.

[0027] A circulation loop is formed between the large water tank 10 , the small water tank 9 and the hot water heat exchanger 2 via a hot water circulation water supply pipeline 4 and a hot water circulation water return pipeline 5 .

[0028] The working process of the utility model hot water joint supply process system is as follows:

[0029] A temperature detection instrument T1 is set in the high temperature area of ​​the small water tank 9, and the temperature setting value is 80℃ / 90℃; when the T1 detection value reaches 90℃, the hot water circulation supply pipeline 4 and the hot water circulation return pipeline 5 are switched to the large water tank 10 for circulation heating, and when the T1 detection value drops to 80℃, the hot water circulation supply pipeline 4 and the hot water circulation return pipeline 5 are switched back to the small water tank 9 for circulation heating.

[0030] A temperature detection instrument T2 is set in the high temperature area of ​​the large water tank 10, and the temperature setting value is 80℃ / 90℃; when the T2 detection value reaches 90℃, the hot water circulation supply pipeline 4 and the hot water circulation return pipeline 5 are switched back to the small water tank 9 for circulation heating; when the T1 detection value is <70℃ and the T2 detection value is >80℃, the production equipment water supply circulation pipeline 20 and the production equipment return circulation pipeline 21 are switched to the large water tank 10.

[0031] When the detection values ​​of T1 and T2 are both less than 70°C, the gas hot water boiler 14 is started, and the water supply circulation pipeline 20 to the production equipment and the water return circulation pipeline 21 to the production equipment are switched to the 9 small water tanks.

[0032] When the T1 detection value is greater than 80° C., the gas hot water boiler 14 stops heating.

[0033] When the detection values ​​of T1 and T2 both reach 90°C, the hot water heat exchanger 2 is adjusted to bypass and discharge part of the hot air directly to the chimney 22.

[0034] From the above content, it can be seen that the hot water combined supply process system of the utility model, under the background of traditional direct discharge of combustion flue gas or simple hot water recovery, realizes full recovery of heat energy by adding a flue gas heat exchanger through exhaust gas, increases the combined heat storage of large and small water tanks, and sets up water tank temperature monitoring and control, and sets an electric three-way regulating valve in the pipeline to switch at any time according to the working conditions, adds a matching hot water boiler to realize rapid heating while making full use of heat energy as much as possible to improve the utilization rate of heat energy.

Claims

1. A hot water combined supply process system, characterized in that: The invention comprises a large water tank (10) and a small water tank (9), wherein the water outlets of the large water tank (10) and the small water tank (9) are both connected to a production equipment circulating water pump (17), the water inlets of the large water tank (10) and the small water tank (9) are both connected to a water outlet of a hot water heat exchanger (2), the water inlet of the hot water heat exchanger (2) is respectively connected to another water outlet of the small water tank (9) and another water outlet of the large water tank (10), a production equipment return water circulation pipeline (21) is arranged between another water inlet of the large water tank (10) and another water inlet of the small water tank (9), and the small water tank (9) is respectively connected to a gas hot water boiler (14) via a boiler circulating water supply pipeline (15) and a boiler circulating water return pipeline (16).

2. The hot water combined supply process system according to claim 1, characterized in that: The hot water heat exchanger (2) is connected to the RTO via the RTO smoke exhaust pipe (1), and the hot water heat exchanger (2) is also connected to a chimney (22) and a cooling fan (3).

3. The hot water combined supply process system according to claim 1, characterized in that: The large water tank (10) is connected to a large water tank supporting softening device (11), and the small water tank (9) is connected to a small water tank supporting softening device (12).

4. The hot water combined supply process system according to claim 1, characterized in that: A water outlet of the large water tank (10) is connected to a production equipment circulating water pump (17) via a production equipment water supply circulation pipeline (20); a production equipment water supply electric three-way regulating valve (18) is provided on the production equipment water supply circulation pipeline (20); and the production equipment water supply electric three-way regulating valve (18) is connected to a water outlet of the small water tank (9) via a pipeline; The other water outlet of the large water tank (10) is connected to the hot water heat exchanger (2) via a hot water circulation water supply pipeline (4); a water supply electric three-way regulating valve (7) and a hot water circulation water pump (6) are sequentially arranged on the hot water circulation water supply pipeline (4) from the large water tank (10) to the hot water heat exchanger (2); the water supply electric three-way regulating valve (7) is connected to the other water outlet of the small water tank (9) via a pipeline.

5. The hot water combined supply process system according to claim 1, characterized in that: The production equipment return water circulation pipeline (21) is provided with a production equipment return water electric three-way regulating valve (19).

6. The hot water combined supply process system according to claim 1, characterized in that: The water outlet of the hot water heat exchanger (2) is connected to the water inlet of the small water tank (9) via a hot water circulation return pipe (5); a return water electric three-way regulating valve (8) is provided on the hot water circulation return pipe (5); and the return water electric three-way regulating valve (8) is connected to the water inlet of the large water tank (10) via a pipe.

7. The hot water combined supply process system according to claim 1, characterized in that: The boiler circulating water supply pipeline (15) is provided with a boiler circulating water pump (13).

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