Redrying condensate water recovery system

Abstract

The utility model relates to a redrying condensate water recovery system which comprises a combined workshop, a condensate water tank and a shell-and-tube heat exchanger. The joint workshop is provided with a drain pipeline A and a drain pipeline B which are connected to the condensate water tank; the condensate water tank is provided with a water inlet and a water outlet, the water inlet is connected with a demineralized water pipeline, and the water outlet is provided with an electric pump unit capable of conveying condensate water in the condensate water tank to a boiler room; the demineralized water pipeline enters the condensate water tank after passing through the shell-and-tube heat exchanger; a flash steam pipeline is arranged on the condensate water tank and enters the condensate water tank after passing through the shell-and-tube heat exchanger; the shell-and-tube heat exchanger can perform heat exchange on the demineralized water pipeline and the flash steam pipeline which pass through; flash steam generated in the condensate water tank passes through a shell pass in the shell-and-tube heat exchanger to form countercurrent flow heat exchange with the demineralized water and then returns to the condensate water tank. And after the condensate water enters the condensate water tank, generated flash steam is eliminated by introducing normal-temperature demineralized water, and all heat of the condensate water is recovered while flash steam discharge is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of steam condensate recovery in production workshops, in particular to a re-baking condensate recovery system. Background Art

[0002] The redrying plant is responsible for processing tobacco leaves to improve their quality and taste and ensure that their quality meets the requirements of the subsequent cigarette production process. Its core equipment mainly includes hot air leaf moistening machine, leaf roasting machine, stem roasting machine, feeder, chip dryer, etc. Its operation requires steam to be heated, and high-temperature condensate will be generated after steam heat exchange. The current condensate recovery technology commonly used in redrying is to use a steam trap pump group for closed recovery, and the condensate is pumped into the high-altitude pipe network and then sent back to the boiler room for use. Due to the 0.2Mpa back pressure in the system pipeline, the process equipment is not smooth in drainage, resulting in unqualified moisture content in tobacco processing.

[0003] In order to meet the requirements of process quality indicators, some factories choose to directly discharge the condensed water generated by process equipment to eliminate back pressure, thereby ensuring that the moisture content of tobacco leaves is qualified. However, the direct discharge of condensed water not only wastes high-quality energy, but also damages the sewage network. In order to improve the core quality indicator of moisture control in tobacco processing, and at the same time recycle the high-quality condensed water generated by the equipment, a re-roasting condensed water recovery system has been developed. The condensed water generated by each device is first collected into the condensed water tank through a direct buried pipe, and then the flash steam is recovered through heat exchange. Finally, the condensed water is sent back to the boiler room for reuse through an electric pump, achieving quality improvement and consumption reduction. Utility Model Content

[0004] In order to solve the deficiencies of the above-mentioned prior art, the utility model provides a re-roasting condensate water recovery system, which uses prefabricated direct buried pipes to first collect the condensate generated by the equipment in the production workshop, and then uniformly recover it to the condensate tank for use in the boiler room, thereby avoiding the back pressure in the pipeline that hinders the discharge of condensate and also avoiding the waste of condensate. The technical solution of the utility model to achieve the above-mentioned purpose is:

[0005] A re-roasting condensate recovery system, comprising a combined workshop, a condensate water tank and a shell and tube heat exchanger; the combined workshop is provided with a drain pipe A and a drain pipe B; the top of the condensate water tank is provided with two pipe openings for receiving condensate collected by the drain pipe A and the drain pipe B respectively; the drain pipe A and the drain pipe B are both provided with a plurality of pipe drain ports; the condensate water tank is provided with a water inlet and a water outlet, the water inlet is connected with a desalted water pipeline, and the water outlet is provided with an electric pump unit The condensed water in the condensed water tank can be delivered to the boiler room; the desalted water pipeline enters the condensed water tank after passing through the shell and tube heat exchanger; a flash steam pipeline is arranged on the condensed water tank, and the flash steam pipeline enters the condensed water tank after passing through the shell and tube heat exchanger; the shell and tube heat exchanger can perform heat exchange between the desalted water pipeline and the flash steam pipeline passing through; the flash steam generated in the condensed water tank goes through the shell side in the shell and tube heat exchanger to form countercurrent heat exchange with the desalted water and then returns to the condensed water tank.

[0006] Furthermore, a stop valve and a temperature sensor are installed before the flash steam pipeline enters the shell and tube heat exchanger, and a stop valve is installed between the pipeline from the flash steam pipeline coming out of the shell and tube heat exchanger to the condensate water tank; an exhaust pipeline connected to the outside atmosphere is installed on the top of the shell side of the shell and tube heat exchanger.

[0007] Furthermore, the desalted water pipeline is provided with an electric valve group, which includes two valves arranged in parallel, one of which is provided with a stop valve, and the other is provided with a stop valve, an electric regulating valve and a stop valve in sequence.

[0008] Furthermore, a magnetic flap level gauge, a temperature sensor and a pressure sensor are arranged inside the condensate water tank. A pressure relief pipeline is arranged on the top of the condensate water tank, and the pressure relief pipeline includes a stop valve and an electric ball valve;

[0009] Furthermore, the condensate water tank is also provided with a sewage discharge pipeline, and the sewage discharge pipeline includes a ball valve and a stop valve; the condensate water tank is provided with an overflow pipeline, and the overflow pipeline includes a stop valve and a steam trap.

[0010] Furthermore, the electric pump unit comprises a stop valve, a water pump, a check valve after the pump and a stop valve which are connected in sequence; a pressure sensor, a pressure gauge and a flow meter are also arranged on the pipeline between the electric pump unit and the boiler.

[0011] Furthermore, the joint workshop includes a drum-type hot air leaf moistening machine 1RunA, a drum-type hot air leaf moistening machine 1RunB, a drum-type hot air leaf moistening machine 2RunA, a drum-type hot air leaf moistening machine 2RunB, a crushed tobacco leaf re-drying machine A, a crushed tobacco leaf re-drying machine B, a tobacco stem re-drying machine, a pre-roasting feeder A, a pre-roasting feeder B, a leaf re-drying machine A, a leaf re-drying machine B and a feeder.

[0012] Furthermore, the condensed water generated by the drum-type hot air leaf moistening machine A, drum-type hot air leaf moistening machine B, drum-type hot air leaf moistening machine A, drum-type hot air leaf moistening machine B, crushed tobacco leaf re-drying machine A, crushed tobacco leaf re-drying machine B, tobacco stem re-drying machine, pre-roasting feeder A and pre-roasting feeder B are all merged into the drain pipe A through pipes; the condensed water generated by the blade re-drying machine A, blade re-drying machine B and the feeder are all merged into the drain pipe B through pipes.

[0013] The condensate from the joint workshop enters the condensate tank 1 through the water supply management A and the drain pipe B4 to achieve vapor-liquid separation. The flash steam enters the bottom of the shell and tube heat exchanger 2 through the flash steam pipe 13 at the top of the condensate tank 1. The flash steam forms a countercurrent heat exchange with the desalted water in the shell of the shell and tube heat exchanger 2. The flash steam forms a condensate after the desalted water is heat exchanged and cooled down, and then re-enters the condensate tank 1 through the condensate discharge port at the bottom of the shell and tube heat exchanger 2; the top of the condensate tank 1 is equipped with a condensate tank 1 pressure relief pipe 17, and a stop valve and an electric ball valve are arranged on the pressure relief pipe 17. The stop valve is normally open and the electric ball valve is normally closed. When the pressure in the condensate tank 1 exceeds 20kpa, the electric ball valve is opened to complete the pressure relief. When the temperature of the condensate tank 1 is higher than 90℃, the heat exchanger desalted water electric regulating valve is opened, and the opening of the electric regulating valve is adjusted according to the temperature of the desalted water after heat exchange of 80℃. When the liquid level in the condensate tank reaches 1.2 m, the electric pump unit 7 starts to deliver the condensate in the condensate tank 1 to the boiler room 8. When the liquid level reaches 0.5 m, the electric pump unit 7 stops running.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The condensed water generated by the equipment and steam pipes is fed into the underground condensate tank by means of buried gravity through prefabricated direct buried insulated pipes. The equipment can drain smoothly, and the condensate can be recovered with zero back pressure, which effectively guarantees the process quality control. After the condensed water enters the condensate tank, the flash steam generated by the condensed water is eliminated by introducing normal temperature desalted water, avoiding flash evaporation and recovering all the heat of the condensed water, thus achieving energy conservation and emission reduction and promoting green production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the system connection of the utility model;

[0017] Figure 2 This is a schematic diagram of the connection of the combined workshop described in the utility model;

[0018] In the figure:

[0019] 1—condensate tank, 11—water inlet, 12—water outlet, 13—flash steam pipeline, 14—magnetic flap level gauge, 15—temperature sensor, 16—pressure sensor, 17—pressure relief pipeline, 18—drain pipeline, 19—overflow pipeline; 2—shell and tube heat exchanger, 21—exhaust pipeline; 3—drain pipeline A; 4—drain pipeline B; 5—pipeline drain port; 6—desalted water pipeline, 61—electric valve group; 7—electric pump unit, 71—pressure gauge, 72—flow meter; 8—boiler room. DETAILED DESCRIPTION

[0020] like Figure 1-2 As shown, the embodiments of the utility model are as follows:

[0021] A redrying condensate recovery system comprises a combined workshop, a condensate water tank 1 and a shell and tube heat exchanger 2; the combined workshop comprises a drum-type hot air leaf moistening machine 1, a drum-type hot air leaf moistening machine 1, a drum-type hot air leaf moistening machine 2, a drum-type hot air leaf moistening machine 2, a crushed tobacco sheet redrying machine A, a crushed tobacco sheet redrying machine B, a tobacco stem redrying machine, a pre-drying feeder A, a pre-drying feeder B, a leaf redrying machine A, a leaf redrying machine B and a feeder; the combined workshop is provided with a drainage pipeline A3 and drain pipe B4; the condensed water produced by drum-type hot air leaf moistening machine 1, drum-type hot air leaf moistening machine 1, drum-type hot air leaf moistening machine 2, drum-type hot air leaf moistening machine 2, crushed tobacco re-drying machine A, crushed tobacco re-drying machine B, tobacco stem re-drying machine, pre-roasting feeder A and pre-roasting feeder B are all collected into drain pipe A3 through pipes; the condensed water produced by blade re-drying machine A, blade re-drying machine B and feeder are all collected into drain pipe B4 through pipes.

[0022] The top of the condensate tank 1 is provided with two pipe openings for receiving the condensate collected by the drain pipe A3 and the drain pipe B4 respectively; the drain pipe A3 and the drain pipe B4 are both provided with a plurality of pipe drain openings 5; the condensate tank 1 is provided with a water inlet 11 and a water outlet 12, the water inlet 11 is connected with a desalted water pipe 6, the desalted water pipe 6 is provided with an electric valve group 61, the electric valve group 61 includes two valves arranged in parallel, one is provided with a stop valve, and the other is provided with a stop valve, an electric regulating valve and a stop valve in sequence. The water outlet 12 is provided with an electric pump unit 7 to deliver the condensate in the condensate tank 1 to the boiler room 8; the electric pump unit 7 includes a stop valve, a water pump, a check valve after the pump and a stop valve connected in sequence; the pipeline between the electric pump unit 7 and the boiler is also provided with a pressure sensor 16, a pressure gauge 71 and a flow meter 72.

[0023] The desalted water pipeline 6 enters the condensed water tank 1 after passing through the shell and tube heat exchanger 2, and a temperature sensor 15 is provided in between; a flash steam pipeline 13 is provided on the condensed water tank 1, and the flash steam pipeline 13 enters the condensed water tank 1 after passing through the shell and tube heat exchanger 2; a stop valve and a temperature sensor 15 are installed before the flash steam pipeline 13 enters the shell and tube heat exchanger 2, and a stop valve is installed between the flash steam pipeline 13 from the shell and tube heat exchanger 2 to the condensed water tank 1; an exhaust steam pipeline 21 connected to the outside atmosphere is installed at the top of the shell side of the shell and tube heat exchanger 2. The shell and tube heat exchanger 2 can perform heat exchange between the desalted water pipeline 6 and the flash steam pipeline 13 passing through; the flash steam generated in the condensed water tank 1 returns to the condensed water tank 1 after going through the shell side in the shell and tube heat exchanger 2 to form a countercurrent heat exchange with the desalted water.

[0024] The condensate tank 1 is provided with a magnetic flap level gauge 14, a temperature sensor 15 and a pressure sensor 16. A pressure relief pipeline 17 is installed on the top of the condensate tank 1, and the pressure relief pipeline 17 includes a stop valve and an electric ball valve. The condensate tank 1 is also provided with a sewage pipeline 18, and the sewage pipeline 18 includes a ball valve and a stop valve; the condensate tank is provided with an overflow pipeline 19, and the overflow pipeline 19 includes a stop valve and a steam trap.

[0025] The condensate from the joint workshop enters the condensate tank 1 through the water supply management A and the drain pipe B4 to achieve vapor-liquid separation. The flash steam enters the bottom of the shell and tube heat exchanger 2 through the flash steam pipe 13 at the top of the condensate tank 1. The flash steam forms a countercurrent heat exchange with the desalted water in the shell of the shell and tube heat exchanger 2. The flash steam forms a condensate after the desalted water is heat exchanged and cooled down, and then re-enters the condensate tank 1 through the condensate discharge port at the bottom of the shell and tube heat exchanger 2; the top of the condensate tank 1 is equipped with a condensate tank 1 pressure relief pipe 17, and a stop valve and an electric ball valve are arranged on the pressure relief pipe 17. The stop valve is normally open and the electric ball valve is normally closed. When the pressure in the condensate tank 1 exceeds 20kpa, the electric ball valve is opened to complete the pressure relief. When the temperature of the condensate tank 1 is higher than 90℃, the heat exchanger desalted water electric regulating valve is opened, and the opening of the electric regulating valve is adjusted according to the temperature of the desalted water after heat exchange of 80℃. When the liquid level in the condensate tank reaches 1.2 m, the electric pump unit 7 starts to deliver the condensate in the condensate tank 1 to the boiler room 8. When the liquid level reaches 0.5 m, the electric pump unit 7 stops running.

[0026] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A re-baking condensed water recovery system, characterized in that: The invention comprises a combined workshop, a condensate water tank (1) and a shell and tube heat exchanger (2); the combined workshop is provided with a drain pipe A (3) and a drain pipe B (4); the top of the condensate water tank (1) is provided with two pipe openings for receiving condensate collected by the drain pipe A (3) and the drain pipe B (4) respectively; the drain pipe A (3) and the drain pipe B (4) are both provided with a plurality of pipe drain openings (5); the condensate water tank (1) is provided with a water inlet (11) and a water outlet (12); the water inlet (11) is connected to a desalted water pipe (6); the water outlet (12) is provided with an electric pump unit (7) capable of pumping the desalted water into the condensate water tank (1). The condensed water in the condensed water tank (1) is sent to the boiler room (8); the desalted water pipeline (6) passes through the shell and tube heat exchanger (2) and then enters the condensed water tank (1); a flash steam pipeline (13) is provided on the condensed water tank (1), and the flash steam pipeline (13) passes through the shell and tube heat exchanger (2) and then enters the condensed water tank (1); the shell and tube heat exchanger (2) can perform heat exchange between the desalted water pipeline (6) and the flash steam pipeline (13) passing through; the flash steam generated in the condensed water tank (1) travels through the shell side of the shell and tube heat exchanger (2) to form countercurrent heat exchange with the desalted water and then returns to the condensed water tank (1).

2. A re-baking condensed water recovery system according to claim 1, characterized in that: A stop valve and a temperature sensor (15) are installed before the flash steam pipeline (13) enters the shell and tube heat exchanger (2); a stop valve is installed between the flash steam pipeline (13) exiting the shell and tube heat exchanger (2) and the pipeline to the condensate tank (1); and an exhaust steam pipeline (21) connected to the outside atmosphere is installed at the top of the shell side of the shell and tube heat exchanger (2).

3. A re-baking condensed water recovery system according to claim 1, characterized in that: The desalted water pipeline (6) is provided with an electric valve group (61), and the electric valve group (61) comprises two valves arranged in parallel, one of which is provided with a stop valve, and the other is provided with a stop valve, an electric regulating valve and a stop valve in sequence.

4. A re-baking condensed water recovery system according to claim 1, characterized in that: The condensate water tank (1) is provided with a magnetic flap level gauge (14), a temperature sensor (15) and a pressure sensor (16) inside, and a pressure relief pipeline (17) is installed on the top of the condensate water tank (1), and the pressure relief pipeline (17) includes a stop valve and an electric ball valve.

5. The re-baking condensed water recovery system according to claim 1, characterized in that: The condensate water tank (1) is also provided with a sewage discharge pipeline (18), and the sewage discharge pipeline (18) includes a ball valve and a stop valve; the condensate water tank is provided with an overflow pipeline (19), and the overflow pipeline (19) includes a stop valve and a drain valve.

6. A re-baking condensate recovery system according to claim 1, characterized in that: The electric pump unit (7) comprises a stop valve, a water pump, a check valve after the pump and a stop valve which are connected in sequence; a pressure sensor (16), a pressure gauge (71) and a flow meter (72) are also arranged on the pipeline between the electric pump unit (7) and the boiler.

7. The re-baking condensate recovery system according to claim 1, characterized in that: The joint workshop includes a drum-type hot air leaf moistening machine 1RunA, a drum-type hot air leaf moistening machine 1RunB, a drum-type hot air leaf moistening machine 2RunA, a drum-type hot air leaf moistening machine 2RunB, a crushed tobacco leaf re-drying machine A, a crushed tobacco leaf re-drying machine B, a tobacco stem re-drying machine, a pre-drying feeder A, a pre-drying feeder B, a leaf re-drying machine A, a leaf re-drying machine B and a feeder.

8. A re-baking condensed water recovery system according to claim 7, characterized in that: The condensed water generated by the drum-type hot air leaf moistening machine A, drum-type hot air leaf moistening machine B, drum-type hot air leaf moistening machine A, drum-type hot air leaf moistening machine B, crushed tobacco leaf re-drying machine A, crushed tobacco leaf re-drying machine B, tobacco stem re-drying machine, pre-roasting feeder A and pre-roasting feeder B are all introduced into the drain pipe A (3) through pipes; the condensed water generated by the blade re-drying machine A, blade re-drying machine B and feeder are all introduced into the drain pipe B (4) through pipes.

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