A condensate discharge system

Abstract

The present invention provides a condensate discharge system, wherein a steam-water separator is arranged on a saturated steam supply pipeline, the steam-water separator is connected to a steam inlet pipe on a rotary joint of a thin plate drum type wire drying machine through a first branch, the steam-water separator is connected to a steam pipeline of a hot air radiator through a second branch; the steam-water separator is connected to an ejection port of a steam ejector through a third branch; the condensate outlet pipe is connected to a first condensate inlet of a flash tank, the condensate outlet of the hot air radiator is connected to a second condensate inlet of the flash tank; the steam outlet of the flash tank is connected to an ejection port, the mixed gas outlet of the steam ejector is connected to a saturated compensation steam supply pipeline; the bottom of the flash tank is connected to a condensate recovery pipeline through a first tank bottom pipeline; the condensate outlet of the steam-water separator is connected to a condensate recovery pipeline through a first branch. The present invention can facilitate the discharge of condensate and avoid energy waste.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco equipment, and in particular relates to a condensed water discharge system. Background Art

[0002] In the tobacco industry, the tobacco drying process is an important production link in the tobacco making process, and the moisture and temperature of tobacco are strictly controlled. At present, the tobacco drying process usually uses heating and humidifying equipment to heat and rehydrate tobacco first, and then expands and dries tobacco with a thin plate drum type tobacco drying machine. When the thin plate drum type tobacco drying machine is working, the saturated steam is divided into two paths. One path enters the cylinder through the rotary joint to heat the cylinder and the thin plate on the cylinder. The other path enters the hot air radiator to heat the air. The hot air is sent into the drum by the fan. The moisture of the tobacco in the drum evaporates under the combined action of these two drying heat sources and is extracted by the dehumidification fan, so that the moisture content of the tobacco reaches the required set value; after the two saturated steam heat exchange, condensed water is formed. After the condensed water is drained by the float trap, it enters the open condensed water recovery tank. The recovery tank is equipped with a high and low liquid level switch to control the condensed water pump to transport the condensed water to the boiler room for recycling.

[0003] Since the production of cigarette factories is not continuous, they will be shut down and started up every day. When the equipment is shut down, the steam valve is closed, and the steam accumulated in the cylinder and hot air radiator will condense into condensed water, and the volume will drop suddenly, causing a local vacuum phenomenon in the equipment and pipelines. A large amount of air, carbon dioxide and other non-condensable gases will be sucked in from the loose seal. Therefore, when the equipment is started again, the inside of the equipment and pipelines are always filled with a large amount of condensed water and non-condensable gases. Since non-condensable gases have a strong insulation effect and a large thermal resistance, they seriously affect the heat transfer efficiency. If these condensed water and non-condensable gases are not discharged in time, the steam heat exchange capacity will decrease, and the heat output will also decrease, which may lead to a long drying wire preheating time and fluctuations in tobacco temperature and moisture content. At the same time, when there is condensed water accumulation in the equipment and pipelines, water hammer is also prone to occur, affecting the normal service life of the equipment. However, during the production process, the silk drying drum uses steam pressure to press the condensed water generated during the production process to the drain valve through the siphon tube, so that the condensed water can be discharged from the drum. This condensed water discharge method will cause air lock phenomenon, which is not conducive to the discharge of condensed water in the silk drying machine.

[0004] At the same time, the open condensate recovery tank only recovers the condensate entering the tank, while the steam that enters the tank along with the condensate and the secondary steam generated after the high-temperature condensate in the tank is depressurized are directly discharged into the atmosphere, causing energy waste. Summary of the invention

[0005] The object of the present invention is to provide a condensate discharge system to solve the above-mentioned technical problems in the prior art, to facilitate the discharge of condensate, to make use of the waste heat of the condensate and to avoid energy waste.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A condensate discharge system, comprising a thin-plate drum type wire drying machine, a heating and humidifying device, a steam ejector, a flash tank, a saturated steam supply pipeline, and a saturated compensating steam supply pipeline for communicating with the heating and humidifying device, wherein a steam-water separator is arranged on the saturated steam supply pipeline, the steam-water separator is communicated with a steam inlet pipe on a rotary joint of the thin-plate drum type wire drying machine through a first branch, the steam-water separator is communicated with a steam pipeline of a hot air radiator of the thin-plate drum type wire drying machine through a second branch; the steam-water separator is communicated with the steam ejector through a third branch, and the steam-water separator is communicated with the steam ejector through a third branch. The condensate outlet pipe on the rotary joint is connected to the first condensate inlet of the flash tank, and the condensate outlet of the hot air radiator is connected to the second condensate inlet of the flash tank; the steam outlet of the flash tank is connected to the ejected port of the steam ejector, and the mixed gas outlet of the steam ejector is connected to the saturated compensating steam supply pipeline; the bottom of the flash tank is connected to the condensate recovery pipeline through the first tank bottom pipeline; the condensate outlet of the steam-water separator is connected to the condensate recovery pipeline through the first branch road.

[0008] Preferably, the bottom of the flash tank is also connected to the trench through a second tank bottom pipeline, and a stop valve is provided on the second tank bottom pipeline.

[0009] Preferably, it also includes a steam trap group A arranged between the condensate outlet pipe on the rotary joint and the first condensate inlet, and the steam trap group A includes a filter, a steam trap fault sensing chamber, a steam trap, and a one-way check valve arranged in sequence.

[0010] Preferably, a bypass pipeline is provided between the condensate outlet pipe on the rotary joint and the first condensate inlet, the bypass pipeline is provided in parallel with the steam trap group A, and a pneumatic angle valve is provided on the bypass pipeline.

[0011] Preferably, it also includes a steam trap group B arranged between the condensate outlet of the hot air radiator and the second condensate inlet, and the steam trap group B includes a filter, a steam trap fault sensing chamber, a steam trap, and a one-way check valve arranged in sequence.

[0012] Preferably, it further comprises a steam trap group C arranged on the first branch road, and the steam trap group C comprises a filter, a steam trap fault sensing chamber, a steam trap, and a one-way check valve which are arranged in sequence.

[0013] Preferably, the condensate outlet of the steam-water separator is also connected to the ditch through a second branch road, and a stop valve is provided on the second branch road.

[0014] Preferably, a filter, a condensate pump and a one-way check valve are provided on the first tank bottom pipe; a magnetic flap level gauge is provided on one side of the flash tank, and a ventilation pipeline is provided on the upper part of the flash tank, and a pneumatic control valve and a pressure transmitter are provided on the ventilation pipeline.

[0015] Preferably, the first branch and the second branch are respectively provided with a pneumatic diaphragm regulating valve and a pressure transmitter, and the pipeline at the condensate outlet pipe on the rotary joint is respectively provided with a temperature transmitter and a pressure transmitter; the third branch is respectively provided with a differential pressure controller and a pressure transmitter, and the pipeline at the mixed gas outlet of the steam ejector is also provided with a pressure transmitter.

[0016] Preferably, the saturated compensating steam supply pipeline is sequentially provided with a pneumatic diaphragm regulating valve, a one-way check valve, a pressure transmitter, and a temperature transmitter; the mixed gas outlet of the steam ejector is connected to the pipeline between the pneumatic diaphragm regulating valve and the one-way check valve.

[0017] The beneficial effects of the present invention are:

[0018] The condensed water discharge system provided by the present invention comprises a flash tank and a steam ejector. The steam ejector uses steam as an ejection source to extract and utilize the secondary steam generated in the flash tank, so that the flash tank always maintains a negative pressure state, which is more conducive to the discharge of condensed water in the tobacco drying drum, the hot air radiator and the pipeline; at the same time, the secondary steam generated in the flash tank is extracted and transported to the heating and humidification equipment for heating and humidifying the tobacco, so that the waste heat energy of the condensed water is effectively utilized, thus avoiding energy waste and also reducing the temperature of the condensed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present invention in detail in conjunction with the drawings, wherein

[0020] Figure 1 A schematic diagram of a condensate discharge system provided in an embodiment of the present invention.

[0021] Markings in the accompanying drawings:

[0022] 1. Thin plate drum type silk drying machine 2. Heating and humidifying equipment 3. Steam ejector

[0023] 4. Flash tank 5. Condensate pump 11. Rotary joint 12. Hot air radiator DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the solution will be further described in detail below in conjunction with specific embodiments.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a condensate discharge system, which includes a thin plate drum type wire drying machine 1, a heating and humidifying device 2, a steam ejector 3, a flash tank 4, a saturated steam supply pipeline, and a saturated compensation steam supply pipeline for communicating with the heating and humidifying device. A steam-water separator 64 is arranged on the saturated steam supply pipeline. The steam-water separator 64 is connected to the steam inlet pipe on the rotary joint of the thin plate drum type wire drying machine 1 through a first branch, and the steam-water separator 64 is connected to the steam pipeline of the hot air radiator of the thin plate drum type wire drying machine 1 through a second branch; the steam-water separator 64 is connected to the steam pipe of the hot air radiator of the thin plate drum type wire drying machine 1 through a second branch; the steam-water separator 64 is connected to the steam pipe of the hot air radiator of the thin plate drum type wire drying machine 1 through a second branch. The three branches are connected with the injection port of the steam ejector 3; the condensate outlet pipe on the rotary joint is connected with the first condensate inlet of the flash tank 4, and the condensate outlet of the hot air radiator is connected with the second condensate inlet of the flash tank 4; the steam outlet of the flash tank 4 is connected with the ejected port of the steam ejector 3, and the mixed gas outlet of the steam ejector 3 is connected with the saturated compensating steam supply pipeline; the bottom of the flash tank 4 is connected with the condensate recovery pipeline through the first tank bottom pipeline; the condensate outlet of the steam-water separator is connected with the condensate recovery pipeline through the first branch road.

[0026] The condensate discharge system provided in the embodiment of the present invention comprises a flash tank 4 and a steam ejector 3. The steam ejector 3 uses steam as an ejection source to extract and utilize the secondary steam generated in the flash tank, so that the flash tank 4 always maintains a negative pressure state, which is more conducive to the discharge of condensate in the tobacco drying drum, the hot air radiator and the pipeline; at the same time, the secondary steam generated in the flash tank 4 is extracted and transported to the heating and humidification equipment for heating and humidifying the tobacco, so that the waste heat energy of the condensate is effectively utilized, thus avoiding energy waste and also reducing the temperature of the condensate.

[0027] Furthermore, the bottom of the flash tank 4 is also connected to the ditch through a second tank bottom pipe, and a stop valve is provided on the second tank bottom pipe, so that the condensed water can enter the condensed water recovery network through the first tank bottom pipe 44, the filter 72, the condensed water pump 5, and the one-way check valve 74, and be recovered to the boiler room for reuse, or be discharged into the ditch through the second tank bottom pipe 45 and the stop valve 75.

[0028] Furthermore, it also includes a steam trap group A arranged between the condensate outlet pipe on the rotary joint and the first condensate inlet, and the steam trap group A includes a filter A1, a steam trap fault sensing chamber A2, a steam trap A3, and a one-way check valve A4 arranged in sequence. Among them, the steam trap fault sensor A2 is used to detect whether the steam trap A3 has a fault.

[0029] Specifically, a bypass pipeline is provided between the condensate outlet pipe on the rotary joint and the first condensate inlet, the bypass pipeline is provided in parallel with the steam trap group A, and a pneumatic angle valve 77 is provided on the bypass pipeline. With this solution, during normal operation, the pneumatic angle valve 77 is closed, and when the steam trap fault sensing chamber A2 detects that the steam trap A3 is faulty, the control system controls the pneumatic angle valve 77 to open, and the bypass pipeline is unblocked; when the steam trap A3 returns to normal, the pneumatic angle valve 77 is controlled to close.

[0030] Furthermore, it also includes a steam trap group B arranged between the condensate outlet of the hot air radiator and the second condensate inlet, and the steam trap group B includes a filter B1, a steam trap fault sensing chamber B2, a steam trap B3, and a one-way check valve B4 arranged in sequence. Among them, the steam trap fault sensor B2 is used to detect whether the steam trap B3 is faulty. It can be understood that a bypass can be set in parallel with the steam trap group B, and a pneumatic angle valve 78 is set on the bypass. When working normally, the pneumatic angle valve 78 is closed. When the steam trap fault sensing chamber B2 detects that the steam trap B3 is faulty, the control system controls the pneumatic angle valve 78 to open and the bypass is unblocked; when the steam trap A3 returns to normal, the pneumatic angle valve 78 is controlled to close.

[0031] Furthermore, it also includes a steam trap group C arranged on the first branch road, and the steam trap group C includes a filter C1, a steam trap fault sensing chamber C2, a steam trap C3, and a one-way check valve C4 arranged in sequence. The steam trap fault sensor C2 is used to detect whether the steam trap C3 has a fault.

[0032] Specifically, the condensate outlet of the steam-water separator 64 is also connected to the ditch through a second branch road, and a stop valve is provided on the second branch road. With this solution, after the main steam passes through the steam-water separator 64, the condensate formed passes through the steam trap group C, enters the pipeline between the condensate pump 5 and the one-way check valve 74, enters the condensate recovery network, and is recovered to the boiler room for reuse, or is discharged into the ditch through the stop valve 76.

[0033] Furthermore, a filter, a condensate pump, and a one-way check valve are arranged on the first tank bottom pipeline 44; a magnetic flap level gauge is arranged on one side of the flash tank, and a ventilation pipeline is arranged on the upper part of the flash tank, and a pneumatic control valve 42 and a pressure transmitter 43 are arranged on the ventilation pipeline. With this solution, the discharge of condensate in the flash tank 4 is mainly controlled by the magnetic flap level gauge 41; when the magnetic flap level gauge 41 detects a high liquid level signal, the control system controls the condensate pump 5 to open, and the condensate is discharged along the pipeline 44; when the magnetic flap level gauge detects a low liquid level signal, the condensate pump 5 is closed; during the operation of the condensate pump, the pressure transmitter 43 detects that the pressure in the tank is lower than the set alarm value for a long time, and the control system controls the pneumatic control valve 42 to open for a period of time, so that the pressure in the tank returns to the normal value range.

[0034] Furthermore, the first branch and the second branch are provided with pneumatic diaphragm regulating valves and pressure transmitters in sequence, and the pipeline at the condensate outlet pipe on the rotary joint is provided with a temperature transmitter and a pressure transmitter in sequence; the third branch is provided with a pressure difference controller and a pressure transmitter in sequence, and the pipeline at the mixed gas outlet of the steam ejector is also provided with a pressure transmitter. With this scheme, the control system adjusts the opening of the pneumatic diaphragm regulating valve 65 in real time according to the steam pressure measured by the pressure transmitter 66 to control the steam flow rate entering the wire drying machine sheet; at the same time, the control system adjusts the opening of the pneumatic diaphragm regulating valve 67 in real time according to the steam pressure measured by the pressure transmitter 68 to control the steam flow rate entering the hot air radiator 12 of the wire drying machine; and the pressure difference controller 69 adjusts the valve opening of the pressure difference controller 69 in real time according to the pressure difference measured by the pressure transmitter 70 and the pressure transmitter 71, thereby controlling the compression capacity of the steam ejector 3 to ensure that too much secondary steam is extracted from the flash steam, causing The condensate pump cannot work normally; and, on the pipeline connecting the condensate outlet pipe on the rotary joint 11 of the thin-plate drum-type wire drying machine 1 and the condensate inlet of the steam trap group A, a pressure transmitter 79 and a temperature transmitter 80 are installed, which are used to transmit the measured pressure and temperature signals to the control system. When the thin-plate drum-type wire drying machine is just preheated, the system controls to reduce the opening of the pneumatic diaphragm regulating valve 67, so that a small amount of steam enters the thin plate of the wire drying machine. When the system detects that the pressure transmitter 79 and the temperature transmitter 80 have reached the system preset values, the system defaults to the end of the preheating stage, and the system controls to increase the opening of the pneumatic diaphragm regulating valve 67.

[0035] Furthermore, the saturated compensating steam supply pipeline is provided with a pneumatic diaphragm regulating valve, a one-way check valve, a pressure transmitter, and a temperature transmitter in sequence; the mixed gas outlet of the steam ejector is connected to the pipeline between the pneumatic diaphragm regulating valve 81 and the one-way check valve 82. With this solution, the pneumatic diaphragm regulating valve 81 adjusts the amount of saturated compensating steam entering the heating and humidifying device 2 according to the steam pressure and temperature measured by the pressure transmitter 83 and the temperature transmitter 84, so that the outlet temperature of the tobacco in the heating and humidifying device meets the process requirements.

[0036] The condensate discharge system provided by the embodiment of the present invention is divided into three branches after the saturated main steam passes through the stop valve 61, the filter 62, the pressure reducing valve 63, and the steam-water separator 64 during use. The steam of the first branch enters the roller thin plate through the steam inlet pipe on the rotary joint 11 of the thin plate roller type wire drying machine 1, and is used to heat the thin plate; the steam of the second branch enters the steam pipeline of the hot air radiator 12 of the thin plate roller type wire drying machine 1, and is used to heat the cold air entering the hot air radiator; the steam of the third branch enters the ejection port of the steam ejector 3 as the ejected steam, and the secondary steam generated in the flash tank 4 enters the ejection port of the steam ejector 3 as the ejected gas. After the ejected steam and the ejected gas are mixed, they are ejected from the mixing outlet of the steam ejector 3 and enter the steam pipeline of the heating and humidification device 2, and are used to heat and humidify the tobacco in the heating and humidification device 2. After the steam heat exchange in the first branch, the formed condensed water enters the flash tank 4 through the condensed water outlet pipe on the rotary joint 11 of the thin-plate drum type tobacco drying machine 1 and the steam trap group A; after the steam heat exchange in the second branch, the formed condensed water also enters the flash tank 4 through the condensed water outlet of the hot air radiator and the steam trap group B; after the steam heat exchange in the third branch, part of the condensed water is attached to the surface of the tobacco, part of it evaporates into the air, and part of it is discharged through the condensed water pipeline inside the heating and humidification equipment; after the main steam passes through the steam-water separator 64, the formed condensed water passes through the steam trap group C, enters the pipeline between the condensed water pump 5 and the one-way check valve 74, enters the condensed water recovery pipeline network, is recovered to the boiler room for reuse, or is discharged into the ditch through the stop valve 76. After the high-temperature condensed water formed by the heat exchange between the steam of the first branch and the steam of the second branch passes through the steam trap group and the flash tank, secondary steam will be generated. There will usually be a small amount of non-condensable gas and air in the saturated steam. The flash tank 4 usually contains a large amount of condensed water, a large amount of secondary steam, a small amount of non-condensable gas and air. The internal structure of the flash tank 4 is similar to that of a steam-water separator, which can separate gas and water. The secondary steam is extracted and compressed by the steam ejector 3 and transported to the heating and humidification equipment 2 for heating and humidification of tobacco. The condensed water passes through the tank bottom pipe 44, the filter 72, the condensate pump 5, and the one-way check valve 74 and enters the condensate recovery pipe network, and is recovered to the boiler room for reuse, or is discharged into the ditch through the tank bottom pipe 45 and the stop valve 75. A pressure transmitter 73 is installed on the pipeline between the condensate pump 5 and the one-way check valve to measure the back pressure behind the condensate pump 5. During the production process, only when the back pressure behind the condensate pump is too high and the system alarms, the stop valve 75 is manually opened to discharge the condensate that cannot be discharged into the ditch.

[0037] The condensate discharge system provided by the embodiment of the present invention has the following technical effects: when working normally, it can maintain a negative pressure in the flash tank for a long time, which is beneficial to the discharge of condensate in the wire drying drum, hot air radiator and pipeline, improves the steam heat exchange efficiency, reduces the preheating time, and saves energy waste; the secondary steam generated by the flash tank is sucked and transported to the heating and humidification equipment for heating and humidifying tobacco, thereby improving the effective utilization of the waste heat energy of the condensate, avoiding waste, and reducing the consumption of steam; after the secondary steam of the flash tank is discharged in time, the condensate in the flash tank is quickly cooled, avoiding the generation of a large number of bubbles in the flash tank, reducing the cavitation damage of the bubbles to the condensate pump, and increasing the life of the condensate pump, while making it easier to discharge the condensate in the flash tank.

[0038] The above are only preferred embodiments of the present invention. It should be pointed out that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, after reading the contents of the present invention, relevant technical personnel in the field may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A condensate discharge system, characterized in that: The invention comprises a thin plate roller type wire drying machine, a heating and humidifying device, a steam ejector, a flash tank, a saturated steam supply pipeline, and a saturated compensating steam supply pipeline for connecting with the heating and humidifying device. A steam-water separator is arranged on the saturated steam supply pipeline. The steam-water separator is connected with the steam inlet pipe on the rotary joint of the thin plate roller type wire drying machine through a first branch. The steam-water separator is connected with the steam pipeline of the hot air radiator of the thin plate roller type wire drying machine through a second branch. The steam-water separator is connected with the ejection port of the steam ejector through a third branch. The condensate outlet pipe on the rotary joint is connected to the first condensate inlet of the flash tank, and the condensate outlet of the hot air radiator is connected to the second condensate inlet of the flash tank; the steam outlet of the flash tank is connected to the ejected port of the steam ejector, and the mixed gas outlet of the steam ejector is connected to the saturated compensating steam supply pipeline; the bottom of the flash tank is connected to the condensate recovery pipeline through the first tank bottom pipeline; the condensate outlet of the steam-water separator is connected to the condensate recovery pipeline through the first branch road; The bottom of the flash tank is also connected to the trench through a second tank bottom pipeline, and a stop valve is provided on the second tank bottom pipeline; It also includes a steam trap group A arranged between the condensate outlet pipe on the rotary joint and the first condensate inlet, and the steam trap group A includes a filter, a steam trap fault sensing chamber, a steam trap, and a one-way check valve arranged in sequence.

2. The condensate discharge system according to claim 1, characterized in that: A bypass pipeline is arranged between the condensate outlet pipe on the rotary joint and the first condensate inlet, the bypass pipeline is arranged in parallel with the steam trap group A, and a pneumatic angle valve is arranged on the bypass pipeline.

3. The condensate discharge system according to claim 1, characterized in that: It also includes a steam trap group B arranged between the condensate outlet of the hot air radiator and the second condensate inlet, and the steam trap group B includes a filter, a steam trap fault sensing chamber, a steam trap, and a one-way check valve arranged in sequence.

4. The condensate discharge system according to claim 1, characterized in that: It also includes a steam trap group C arranged on the first branch road, and the steam trap group C includes a filter, a steam trap fault sensing chamber, a steam trap, and a one-way check valve arranged in sequence.

5. The condensate discharge system according to claim 1, characterized in that: The condensate outlet of the steam-water separator is also connected to the ditch through a second branch road, and a stop valve is arranged on the second branch road.

6. The condensate discharge system according to claim 1, characterized in that: A filter, a condensate pump and a one-way check valve are arranged on the bottom pipe of the first tank; a magnetic flap level gauge is arranged on one side of the flash tank, a ventilation pipeline is arranged on the upper part of the flash tank, and a pneumatic control valve and a pressure transmitter are arranged on the ventilation pipeline.

7. The condensate discharge system according to claim 1, characterized in that: The first branch and the second branch are respectively provided with a pneumatic diaphragm regulating valve and a pressure transmitter, and the pipeline at the condensate outlet pipe on the rotary joint is respectively provided with a temperature transmitter and a pressure transmitter; the third branch is respectively provided with a pressure difference controller and a pressure transmitter, and the pipeline at the mixed gas outlet of the steam ejector is also provided with a pressure transmitter.

8. The condensate discharge system according to any one of claims 1 to 7, characterized in that: The saturated compensating steam supply pipeline is sequentially provided with a pneumatic diaphragm regulating valve, a one-way check valve, a pressure transmitter, and a temperature transmitter; the mixed gas outlet of the steam ejector is connected to the pipeline between the pneumatic diaphragm regulating valve and the one-way check valve.

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