Closed condensate water recycling system

Abstract

The application discloses a closed condensate water recycling system, which comprises a first condensate water recycling tank and a second condensate water recycling tank which are communicated at the bottom, the inlet end of the first condensate water recycling tank is connected with a condensate water pipe of a thin plate drying and cutting machine, and the second condensate water recycling tank is connected with a low-temperature cooling water pipe provided with an electric regulating valve; the steam outlet pipe at the top of the first condensate water recycling tank is connected with the throat inlet of a first water jet pump, the nozzle inlet of the first water jet pump is connected with the side water outlet pipe of the second condensate water recycling tank provided with a first water pump, and the diffuser outlet of the first water jet pump is connected with the top water inlet pipe of the second condensate water recycling tank; the bottom water outlet pipe of the second condensate water recycling tank is connected with the throat inlet of a second water jet pump, the diffuser outlet of the second water jet pump is connected with the inlet pipe of a second water pump, a self-operated pressure regulating valve is arranged on the outlet pipe of the second water pump, a backwater pipe connected with the nozzle inlet of the second water jet pump is arranged between the self-operated pressure regulating valve and the second water pump, and a throttle valve is arranged on the backwater pipe. The application can achieve the purposes of energy saving and emission reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of condensate water recovery, in particular to a closed condensate water recovery system. BACKGROUND

[0002] In the tobacco industry, a large amount of condensate water is generated during the operation of the sheet drying machine. Due to the process, the temperature of the condensate water is relatively high, usually above 90 DEG C. At present, the condensate water of the sheet drying machine is collected by configuring an open recovery tank, and then the collected condensate water is directly discharged into a ditch, resulting in a large amount of heat waste and environmental heat pollution. Secondly, the open recovery condensate water inevitably produces secondary steam, which cannot be effectively utilized and can only be discharged on site, resulting in waste of high-quality heat and increasing the consumption of steam. SUMMARY

[0003] In order to solve the above problems, the present application provides an energy-saving and emission-reducing closed condensate water recovery system, which can specifically adopt the following technical scheme:

[0004] The closed condensate water recovery system comprises a first condensate water recovery tank, a second condensate water recovery tank, a first water jet pump and a second water jet pump. The inlet end of the first condensate water recovery tank is connected with a condensate water pipe of a sheet drying machine. The inlet end of the second condensate water recovery tank is connected with a low-temperature cooling water pipe. An electric regulating valve is arranged on the low-temperature cooling water pipe. A communication pipe is arranged at the bottom of the first condensate water recovery tank and the second condensate water recovery tank. The steam outlet pipe at the top of the first condensate water recovery tank is connected with the throat inlet of the first water jet pump. The nozzle inlet of the first water jet pump is connected with a side water outlet pipe of the second condensate water recovery tank. A first water pump is arranged on the side water outlet pipe. The diffuser outlet of the first water jet pump is connected with a water inlet pipe at the top of the second condensate water recovery tank. The bottom water outlet pipe of the second condensate water recovery tank is connected with the throat inlet of the second water jet pump. The diffuser outlet of the second water jet pump is connected with the inlet pipe of the second water pump. A self-operated pressure regulating valve is arranged on the outlet pipe of the second water pump. A backwater pipe connected with the nozzle inlet of the second water jet pump is arranged between the self-operated pressure regulating valve and the second water pump. A throttling valve is arranged on the backwater pipe.

[0005] A pressure sensor and a liquid level sensor are arranged on the second condensate water recovery tank. The pressure sensor is used to send a signal to a PLC to control the opening and closing of the electric regulating valve. The liquid level sensor is used to send a signal to the PLC to control the working state of the second water pump, so as to realize the automatic elimination of flash steam and the automatic grid connection of condensate water.

[0006] The low-temperature cooling water pipe is connected with a sprayer arranged at the top of the second condensate recovery tank, which promotes the uniform distribution of the cooling water.

[0007] The outlet pipe of the second water pump is connected with the inlet pipe of the deaerated water tank through the condensate pipe network, so as to achieve the purpose of condensate recovery.

[0008] The closed condensate recovery system provided by the application has the advantages of simple structure, easy implementation and reconstruction, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a structural schematic diagram of the application. DETAILED DESCRIPTION

[0010] The embodiments of the application will be described in detail below with reference to the accompanying drawings, which are implemented on the premise of the technical scheme of the application, and give detailed implementation modes and specific working processes, but the protection scope of the application is not limited to the following embodiments.

[0011] As Figure 1As shown, the closed condensate water recycling system comprises a first condensate water recycling tank 1, a second condensate water recycling tank 2, a first hydraulic jet pump 3 and a second hydraulic jet pump 4. The first condensate water recycling tank 1 is an original equipment, and its inlet end is connected with a condensate water pipe of a sheet drying machine. The second condensate water recycling tank 2 is a newly added equipment, and its inlet end is connected with a 20℃ low-temperature cooling water pipe. An electric regulating valve 5 is installed on the low-temperature cooling water pipe, and a sprayer 6 is installed at the end of the low-temperature cooling water pipe. The sprayer 6 is located at the top of the second condensate water recycling tank 2, and can uniformly distribute the cooling water. In order to ensure the same water level, a communication pipe is installed at the bottom of the first condensate water recycling tank 1 and the second condensate water recycling tank 2. The steam outlet pipe at the top of the first condensate water recycling tank 1 is connected with the throat inlet of the first hydraulic jet pump 3. The nozzle inlet of the first hydraulic jet pump 3 is connected with a side water outlet pipe of the second condensate water recycling tank 2. A first water pump 7 is installed on the side water outlet pipe. The diffuser outlet of the first hydraulic jet pump 3 is connected with a top water inlet pipe of the second condensate water recycling tank 2. The bottom water outlet pipe of the second condensate water recycling tank 2 is connected with the throat inlet of the second hydraulic jet pump 4. The diffuser outlet of the second hydraulic jet pump 4 is connected with the inlet pipe of a second water pump 8. A self-operated pressure regulating valve 9 is installed on the outlet pipe of the second water pump 8. The outlet pipe is connected with the inlet pipe of a deoxygenated water tank through a condensate water pipe network. A backwater pipe connected with the nozzle inlet of the second hydraulic jet pump 4 is installed between the self-operated pressure regulating valve 9 and the second water pump 8. A throttling valve 10 is installed on the backwater pipe. A pressure sensor and a liquid level sensor are installed on the second condensate water recycling tank 2. The pressure sensor is used to send a signal to a PLC to control the opening and closing of the electric regulating valve 5. The liquid level sensor is used to send a signal to the PLC to control the working state of the second water pump 8, so as to realize the automatic elimination of flash steam and the automatic grid connection of condensate water in the system.

[0012] In operation, the condensate water from the sheet drying machine is sent into the first condensate water recycling tank 1. The condensate water will generate flash steam at the upper part of the first condensate water recycling tank 1 due to the sudden change of volume. The flash steam is sucked into the second condensate water recycling tank 2 through the first hydraulic jet pump 3 installed at the upper part of the first condensate water recycling tank 1. In this process, the flash steam is forced to mix into the condensate water. The power water flow required by the first hydraulic jet pump 3 is delivered by the condensate water in the second condensate water recycling tank 2 through the first water pump 7.

[0013] In order to keep the pressure in the first condensate water recycling tank 1 and the second condensate water recycling tank 2 within the set value and ensure the normal operation of the sheet drying machine, when the flash steam is excessive, the pressure in the first condensate water recycling tank 1 and the second condensate water recycling tank 2 will rise. At this time, the electric regulating valve 5 is opened and the 20℃ condensate water is introduced to absorb the heat of the flash steam, so as to rapidly condense the flash steam and reduce the pressure in the first condensate water recycling tank 1 and the second condensate water recycling tank 2.

[0014] When the condensate in the second condensate recovery tank 2 exceeds the set water level value, the anti-cavitation delivery pipeline composed of the second hydraulic jet pump 4, the second water pump 8, the self-operated pressure regulating valve 9 and the throttle valve 10 is started to deliver the condensate to the condensate pipeline network and then to the deaerated water tank inlet pipe for recycling. Specifically, the condensate in the second condensate recovery tank 2 is boosted by the second hydraulic jet pump 4 and then sent to the second water pump 8 to prevent cavitation at the inlet of the second water pump 8 due to excessively low suction pressure. The condensate delivered by the second water pump 8 is partly used to maintain the normal operation of the second hydraulic jet pump 4 after passing through the throttle valve 10, and the other part of the condensate exceeding the pressure set requirement of the self-operated pressure regulating valve 9 enters the condensate pipeline network and is delivered to the deaerated water tank for recycling.

[0015] It should be noted that in the description of the present application, the terms indicating the orientation or positional relationship such as "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application.

Claims

1. A closed condensate recovery system, characterized by: The application relates to a condensate water recovery device for a thin plate strip making machine, which comprises a first condensate water recovery tank, a second condensate water recovery tank, a first hydraulic jet pump and a second hydraulic jet pump. The bottom of the first condensate water recovery tank is connected with the second condensate water recovery tank through a communication pipe; the steam outlet pipe at the top of the first condensate water recovery tank is connected with the throat inlet of the first hydraulic jet pump; the nozzle inlet of the first hydraulic jet pump is connected with the side water outlet pipe of the second condensate water recovery tank, and the side water outlet pipe is provided with a first water pump; the diffuser outlet of the first hydraulic jet pump is connected with the top water inlet pipe of the second condensate water recovery tank; the bottom water outlet pipe of the second condensate water recovery tank is connected with the throat inlet of the second hydraulic jet pump; the diffuser outlet of the second hydraulic jet pump is connected with the inlet pipe of the second water pump; the outlet pipe of the second water pump is provided with a self-operated pressure regulating valve; a backwater pipe, which is connected with the nozzle inlet of the second hydraulic jet pump, is arranged between the self-operated pressure regulating valve and the second water pump; and a throttling valve is arranged on the backwater pipe. The second condensate water recovery tank is provided with a pressure sensor and a liquid level sensor; the pressure sensor is used for sending a signal to a PLC to control the opening and closing of the electric regulating valve; and the liquid level sensor is used for sending a signal to the PLC to control the working state of the second water pump. During operation, the condensate water from the thin plate strip making machine is sent into the first condensate water recovery tank; the flash steam generated in the upper part of the first condensate water recovery tank due to the volume mutation of the condensate water is sucked into the second condensate water recovery tank through the first hydraulic jet pump arranged on the upper part of the first condensate water recovery tank; and in the process, the flash steam is forced to mix into the condensate water; the power water flow required by the first hydraulic jet pump is transported by the condensate water in the second condensate water recovery tank through the first water pump. In order to keep the pressure in the first condensate water recovery tank and the second condensate water recovery tank within a set value and ensure the normal operation of the thin plate strip making machine, when the flash steam is excessive, the pressure in the first condensate water recovery tank and the second condensate water recovery tank is increased; at this time, the electric regulating valve is opened and the condensate water at 20 DEG C is introduced to absorb the heat of the flash steam, so that the flash steam is rapidly condensed, thereby reducing the pressure in the first condensate water recovery tank and the second condensate water recovery tank.

2. The closed condensate recovery system of claim 1, wherein: When the condensate water in the second condensate water recovery tank exceeds a set water level value, the anti-cavitation conveying pipeline composed of the second hydraulic jet pump, the second water pump, the self-operated pressure regulating valve and the throttling valve is started to transport the condensate water into the condensate water pipe network and then into the inlet pipe of the deoxidized water tank for recycling.

3. The closed condensate recovery system of claim 1, wherein: The low-temperature cooling water pipe is connected with a sprayer at the tail end, and the sprayer is arranged on the top of the second condensate water recovery tank. The outlet pipe of the second water pump is connected with the inlet pipe of the deoxidized water tank through the condensate water pipe network.

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