Energy-saving device for recovering exhaust steam of high-temperature condensate water system of a cut tobacco dryer

Abstract

The utility model provides an energy -conserving devices of tobacco dryer high temperature condensate water system steam exhaust recycling, pressurize the softened water into the recovery jar, even distribution in the padding section after atomizing in the top of jar, with the ascending steam exhaust reverse continuous contact, sufficient heat exchange and quality change, the mixed liquid after mixed condensation falls into the liquid storage area collection and pressurized pumping to the condensate pipe network recovery, the jar body is communicated with the outside atmosphere through the venting pipeline at the top export. The utility model can utilize after the effective recovery of steam exhaust, reduce the tobacco dryer energy consumption index, realize energy -conserving and environmental protection.

Description

Technical Field

[0001] This utility model relates to an energy-saving device for recovering and utilizing the waste steam of the high-temperature condensate system in a cigarette drying machine used in cigarette manufacturing. Background Technology

[0002] With increasing global energy consumption and intensifying global climate change, society's awareness of sustainable development and environmental protection is constantly rising, making energy conservation and emission reduction crucial for enterprise development. In cigarette manufacturing, the existing steam system of the drying machine directly discharges the waste steam generated from condensate recovery in the condensate tank into the air, resulting in wasted heat energy, hindering energy conservation and emission reduction, and negatively impacting the enterprise's economic benefits and social image. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model proposes an energy-saving device for recovering and utilizing the waste steam of the high-temperature condensate system of a wire drying machine. The waste steam can be effectively recovered and utilized, reducing the energy consumption index of the wire drying machine and achieving energy saving and environmental protection.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention proposes an energy-saving device for recovering and utilizing exhaust steam from the high-temperature condensate system of a yarn drying machine. The saturated steam, which serves as the heat source for the yarn drying machine's steam system in the yarn-making workshop, undergoes heat exchange and becomes condensate. This condensate is then separated into condensate and exhaust steam in a flash tank. The condensate is pumped to the condensate pipeline network, and the exhaust steam is discharged into the yarn drying machine's exhaust pipe. This energy-saving device includes:

[0006] The exhaust steam inlet pipeline is used to introduce the exhaust steam separated from the flash tank into the recovery tank through the middle of the tank body;

[0007] The softened water delivery pipeline is used to pump softened water into the steam inlet atomizing nozzle at the top center of the recovery tank;

[0008] The mixed liquid output pipeline is used to pressurize and pump the mixed liquid to the condensate network;

[0009] The recovery tank is connected to the outside atmosphere via a vent pipe at the top outlet. The tank is divided into an upper mixing and exchange zone and a lower liquid storage zone, with the height of the exhaust steam inlet as the boundary. The mixing and exchange zone is equipped with atomizing nozzles, a spray plate, and a packing section at intervals from top to bottom. The atomizing nozzles are centrally located at the top of the tank and are used to atomize the softened water fed into the tank, increasing the steam-water heat exchange area. The spray plate is located between the atomizing nozzles and the packing section and is used to collect the falling atomized droplets and evenly spray them onto the packing section below. The packing section has at least one layer of packing. The liquid storage zone is used to store the mixture formed by the condensation of exhaust steam and softened water.

[0010] The energy-saving device for recovering and utilizing exhaust steam in the high-temperature condensate system of the wire drying machine of this invention adopts a three-stage absorption structure of spray, water film, and packing, which uses low-temperature water to completely absorb the exhaust steam. Its structural features are as follows:

[0011] The recovery tank is an atmospheric pressure vessel made of 316L stainless steel, with a tank diameter of 800mm and dimensions of 1700mm×800mm×2600mm. It has a design pressure of 0.098Mpa, a design temperature of 150℃, and an operating temperature of 90℃. The tank is equipped with a steam inlet, exhaust steam outlet, spray water inlet, and water outlet. It also includes a drain outlet, level gauge interface, nozzle access port, tank access port, thermometer, and temperature control interface.

[0012] The exhaust steam outlet is located at the top of the tank and is connected to the vent pipe via a pipe with a shut-off valve. This shut-off valve is normally open to keep the inside of the tank connected to the outside atmosphere.

[0013] The atomizing nozzle is made of 316L stainless steel and includes a fixed cylinder and a movable cylinder coaxially mounted. Softened water is received through the inlet side shaft end. The fixed cylinder is axially continuous, and the movable cylinder is slidably fitted inside the fixed cylinder along the axial direction, with a radial gap between them to form an annular cavity. A spring is built into the annular cavity, coaxially fitted on the movable cylinder and tensioned axially between the movable cylinder and the fixed cylinder. The inlet side shaft end of the movable cylinder is open, and the outlet side shaft end is sealed by a blind plate. The cylinder body is divided into an inlet section and an outlet section along the axial direction from the inlet side to the outlet side. The length of the inlet section is greater than that of the outlet section. The outer peripheral wall of the inlet section is closed, and several atomizing holes are evenly distributed on the outer peripheral wall of the outlet section. When the spring is in its natural state, the two shaft ends of the movable cylinder and the fixed cylinder are flush. After softened water is introduced into the movable cylinder from the inlet side, the movable cylinder can slide towards the outlet side under the pressure of the softened water until some or all of the atomizing holes in the outlet section are exposed outside the fixed cylinder. Several atomizing holes are evenly spaced around the circumference and layered evenly spaced along the axial direction. This atomizing nozzle has a simple design, reliable performance, long service life, and self-adjusting function. It can output water at a constant speed under low pressure drop and all operating conditions, thus achieving good atomization of water under any operating condition from zero to full load.

[0014] The inner wall of the fixed cylinder has a lower plug protruding radially at the end of the water outlet side, and the outer wall of the movable cylinder has an upper plug flaring out radially at the end of the water inlet side. The upper plug maintains sliding contact with the inner wall of the fixed cylinder as the movable cylinder moves. The two ends of the annular cavity are sealed by the upper plug and the lower plug, respectively.

[0015] A vertical mounting port is pre-installed at the center of the top of the tank. The lower end of this mounting port houses the atomizing nozzle, while the upper end serves as a nozzle inspection port for maintenance and repair. The side connects to the spray inlet. The atomizing nozzle's inlet side is mounted to the mounting port via a flange attached to the end of the fixed cylinder shaft, secured with bolts and a pressure strip. This allows for easy disassembly and maintenance from the outside of the tank.

[0016] The rinsing plate is a plate-shaped structure that is horizontally separated inside the tank. Several short channels are formed on the plate, which are regularly distributed around the center line of the tank and vertically connected. The softened water is atomized by the atomizing nozzle and falls evenly into the packing section through each short channel.

[0017] Furthermore, the tray is equipped with several vertically penetrating short pipes, which are centrally symmetrically distributed around the center line of the tank, serving as short channels. Multiple DN50 stainless steel short pipes, each 60mm long, are threaded through the tray. These short pipes are arranged in groups, with equidistant spacing along a hexagonal outline. The distance between adjacent short pipes in each group is 150mm. These groups are radially offset from the center line of the tank, with an offset interval of 150mm. An additional short pipe is centrally located at the center line of the tank. The tray is made of 6mm thick 316L stainless steel plate with an outer diameter of 798mm.

[0018] The packing section has two layers of packing, each 100mm thick. Each layer consists of circular stainless steel mesh sheets arranged within an annular support ring plate. These sheets are then positioned on the inner circumferential wall of the tank via the support ring plate, horizontally spaced within the tank. Multiple layers of packing sheets are spaced apart along the height of the tank to form one layer of packing. The support ring plate has an outer diameter of 798mm and an inner diameter of 698mm, and the outer diameter of the stainless steel mesh sheets matches the inner diameter of the support ring plate.

[0019] The softened water pumped to the recovery tank is atomized through atomizing nozzles and sprayed onto the shower tray and the area above the shower tray. As it falls, the atomized liquid drips onto the shower tray and gradually accumulates. Then it falls through the short channels on the shower tray and is evenly distributed on the packing section below, forming a water film on the packing section.

[0020] The exhaust steam entering the recovery tank rises; in the packing section, the packing increases the contact area and contact time between the steam and liquid, promoting heat transfer and exchange, fully exchanging heat and mass, and cooling the exhaust steam; the remaining exhaust steam that continues to rise after passing through the shower plate has already been cooled in the packing section, and after further mixing and condensing with the atomized droplets in the atomization zone above the shower plate, it falls back to the shower plate, then falls through the short channels of the shower plate, and after passing through the packing section, it falls into the liquid storage area.

[0021] The exhaust pipe of the wire drying machine forms two branches with shut-off valves. One branch is connected to the vent pipe, and the other branch serves as the exhaust steam inlet pipe, connected to the steam inlet in the middle of the recovery tank. The shut-off valves on the two branches are open and closed respectively. When the shut-off valve on the exhaust steam inlet pipe is normally open, the shut-off valve on the other branch is normally closed. When the shut-off valve on the exhaust steam inlet pipe is closed, the shut-off valve on the other branch is open.

[0022] The softened water delivery pipeline includes a main softened water pipe and a softened water bypass connected in parallel with the main softened water pipe. The main softened water pipe connects to the spray inlet at the top center of the recovery tank. A softened water regulating valve and two butterfly valves located on either side of the softened water regulating valve are installed on the pipe section connected in parallel with the softened water bypass. A butterfly valve is also installed on the softened water bypass. The softened water comes from the sodium ion exchanger in the power workshop.

[0023] The mixed liquid output pipeline forms two parallel mixed liquid output branches. Each mixed liquid output branch is equipped with two butterfly valves and a booster pump, pressure gauge, and check valve arranged sequentially between the two butterfly valves in the direction of flow. The input ends of the two mixed liquid output branches merge to form a mixed liquid input side pipeline, which is connected to the outlet at the bottom of the recovery tank. The output ends of the two mixed liquid output branches merge to form a mixed liquid output side pipeline. The mixed liquid is sent into the condensate network through the mixed liquid output side pipeline equipped with a flow meter and butterfly valve.

[0024] It also includes a drain line with a ball valve, which is connected in parallel with the mixed liquid inlet line and leads to the outlet of the recovery tank. The drain line is used during the initial cleaning of the tank or during maintenance emptying.

[0025] The upper part of the recovery tank is equipped with a pressure gauge; the tank body is equipped with level gauges and temperature detection elements corresponding to the liquid storage area. The level gauges detect the real-time liquid level of the mixture in the tank, and the temperature detection elements detect and display the real-time temperature of the mixture in the tank. The temperature detection elements configured in the recovery tank are a resistance temperature detector (RTD) and a thermometer.

[0026] Configure a PLC automatic control cabinet and connect various electric valves, water pumps, flow meters, temperature and liquid level instruments to the PLC automatic control cabinet.

[0027] To maintain good water quality, PE pipes are used.

[0028] Compared with existing technologies, the beneficial effects of this utility model are reflected in:

[0029] This invention utilizes softened water that is pressurized by a water pump, controlled by a regulating valve, atomized by nozzles, and distributed in a spray tray. The softened water then undergoes a thorough heat and mass exchange process with the exhaust steam in the packing compartment. The mixture is then pressurized again by a water pump and recycled back into the condensate network system for reuse. This method effectively recovers exhaust steam, has strong system adaptability, reduces energy consumption and waste emissions in cigarette factories, improves resource utilization efficiency, helps enterprises reduce production costs, enhance their environmental image, and increase their competitiveness. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the internal structure of the recycling tank;

[0032] Figure 3 This is a structural diagram of the recycling tank from another perspective;

[0033] Figure 4 This is a schematic diagram of the pelvic floor disc structure;

[0034] Figure 5 This is a structural schematic diagram of the packing support component;

[0035] Figure 6 This is a schematic diagram of the atomizing nozzle;

[0036] Figure 7 This is a schematic diagram of the working state of the atomizing nozzle.

[0037] In the picture:

[0038] 1. Saturated steam header; 2. Flow meter; 3. Steam-water separator; 4. Steam trap; 5. Rotary drum; 6. Heat exchanger; 7. Flash tank; 8. Pressurized water pump; 9. Condensate network; 10. Exhaust steam pipeline for wire drying machine; 10.1 Exhaust steam inlet pipeline; 11. Vent pipeline; 12. Softened water delivery pipeline; 12.1 Softened water main pipe; 12.2 Softened water bypass; 13. Softened water regulating valve; 14. Butterfly valve; 15. Recovery tank; 16. Level gauge; 17. Pressure gauge; 18. Resistance temperature detector; 19. Thermometer; 20. Mixed liquid output branch; 21. Check valve; 22. Shut-off valve; 23. Mixed liquid input side pipeline; 24. Mixed liquid output side pipeline; 25. Ball valve; 26. Sewage discharge pipeline;

[0039] 31 Steam inlet; 32 Exhaust steam outlet; 33 Sprayer water inlet; 34 Water outlet; 35 Sewage outlet; 36 Level gauge interface; 371 Installation pipe port; 372 Nozzle inspection port; 38 Tank body inspection port; 39 Thermometer and temperature variable interface;

[0040] 4. Atomizing nozzle; 41. Fixed cylinder; 411. Lower plug; 412. Flange; 42. Movable cylinder; 421. Blind flange; 422. Inlet section; 423. Outlet section; 424. Atomizing hole; 425. Upper plug; 43. Spring; 44. Bolt; 45. Pressure strip;

[0041] 5. Sprinkler tray; 51. Short tube;

[0042] 6. Packing section; 61. Support ring plate; 62. Stainless steel mesh. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] Figure 1 The original steam system of the wire drying machine is shown, along with the waste steam recovery system added in this embodiment. In the original steam system of the wire drying machine, the saturated steam delivered by the saturated steam header enters the steam-water separator, where its pressure is adjusted. It then enters the rotary drum to dry the material and the heat exchanger to heat the air, turning into condensate which enters the flash tank. The condensate is pressurized by the condensate pump and sent into the condensate network pipe, while the flash steam is directly discharged into the air from the roof of the plant.

[0045] This embodiment applies to the recovery of exhaust steam from the steam system of the cylindrical drying equipment in the cigarette manufacturing workshop. Softened water is discharged from the power vehicle, and the flow rate is controlled by a softened water regulating valve. It is then pressurized and pumped into the recovery tank, where it is atomized and sprayed at the top. The atomized softened water mixes with the flash steam from the condensate of the drying machine to exchange matter and heat. The temperature of the mixed liquid is controlled at around 85°C, and then it is pumped to the condensate collection system for recovery.

[0046] In practice, the waste steam recovery method of the high-temperature condensate system of the tobacco drying machine can recover 60 kg / h of waste steam, which saves water and recovers 2300 kJ / kg of heat, with a total heat of 138 MJ / h, thus reducing the unit tobacco steam consumption of the tobacco drying machine.

[0047] Regarding the softened water volume: The flash steam volume of the drying machine is 0.227 t / h, with a calorific value of 2679.6 kJ / kg. The spray softened water has a temperature of 25℃ and an enthalpy of 104.8 kJ / kg. The outlet mixed liquid has a temperature of 90℃ and an enthalpy of 376.9 kJ / kg. Therefore, the required softened water volume is 1.92 t / h. Based on this, and considering production fluctuations, operational adjustments, and safety margins, the softened water volume is calculated at 3 t / h.

[0048] The flow rate of the wire dryer can be monitored. When the average flow rate reaches the set value for more than a specified time, the energy-saving device for the waste steam recovery and utilization of the high-temperature condensate system of the wire dryer in this embodiment is started and the softened water pump is started. The softened water is used to cool the flash steam of the condensate generated during the operation of the wire dryer and recover it to the deaerator water tank in the boiler room.

[0049] After testing, it was found that the amount of flash steam generated during the operation of the wire drying machine is relatively small. Therefore, the opening degree of the butterfly valve in the softened water delivery pipeline used for heat recovery should not be too large; otherwise, the return water temperature will be too low, and water hammer may easily occur when it enters the condensate network and merges with the high-temperature condensate. Based on the test results, the opening degree of the butterfly valve in the softened water delivery pipeline was set for different conditions: recovery tank temperature less than 80℃, 80-85℃, 85-90℃, and greater than 90℃.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of a wire drying machine, characterized in that... include: The exhaust steam inlet pipeline is used to introduce the exhaust steam separated from the flash tank into the recovery tank through the steam inlet in the middle of the tank. The softened water delivery pipeline is used to pump softened water into the atomizing nozzle at the top center of the recovery tank; The mixed liquid output pipeline is used to pressurize and pump the mixed liquid in the tank to the condensate pipeline network; The recovery tank is connected to the outside atmosphere through a vent pipe at the top outlet. The tank is divided into an upper mixing and exchange zone and a lower liquid storage zone, with the height of the exhaust steam inlet as the boundary. In the mixing and exchange zone, atomizing nozzles, a spray plate, and a packing section are arranged at intervals from top to bottom. The atomizing nozzles are centrally located at the top of the tank and are used to atomize the softened water fed into the tank. The spray plate is located between the atomizing nozzles and the packing section and is used to collect the falling atomized droplets and evenly spray them onto the packing section below. The packing section has at least one layer of packing. The liquid storage zone is used to store the mixture formed by the condensation of exhaust steam and softened water.

2. The energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of the wire drying machine according to claim 1, characterized in that: The atomizing nozzle includes a fixed cylinder and a movable cylinder coaxially mounted. Softened water is received through the inlet side axial end. The fixed cylinder is axially continuous, and the movable cylinder is slidably fitted inside the fixed cylinder along the axial direction, with a radial gap between them forming an annular cavity. A spring is built into the annular cavity, coaxially fitted onto the movable cylinder and tensioned axially between the movable and fixed cylinders. The inlet side axial end of the movable cylinder is open, and the outlet side axial end is sealed by a blind plate. The cylinder body is divided into an inlet section and an outlet section along the axial direction from the inlet side to the outlet side. The length of the inlet section is greater than that of the outlet section. The outer peripheral wall of the inlet section is closed, and several atomizing holes are evenly distributed on the outer peripheral wall of the outlet section. When the spring is in its natural state, the two axial ends of the movable cylinder and the fixed cylinder are flush. After softened water is introduced into the movable cylinder from the inlet side, the movable cylinder can slide towards the outlet side under the pressure of the softened water until some or all of the atomizing holes in the outlet section are exposed outside the fixed cylinder.

3. The energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of the wire drying machine according to claim 1, characterized in that: The rinsing plate is a plate-shaped structure that is horizontally separated inside the tank. Several short channels are formed on the plate, which are regularly distributed around the center line of the tank and vertically connected. The softened water is atomized by the atomizing nozzle and falls evenly into the packing section through each short channel.

4. The energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of the wire drying machine according to claim 1, characterized in that: The recovery tank is equipped with a level gauge and a temperature detection element corresponding to the liquid storage area. The level gauge detects the real-time liquid level of the mixture in the tank, and the temperature detection element detects and displays the real-time temperature of the mixture in the tank. The temperature detection element of the recovery tank is a thermal resistor and a thermometer.

5. The energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of the wire drying machine according to claim 1, characterized in that: The exhaust pipe of the wire drying machine forms two branches with shut-off valves. One branch is connected to the vent pipe, and the other branch serves as the exhaust steam inlet pipe, which is connected to the steam inlet in the middle of the recovery tank.

6. The energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of the wire drying machine according to claim 1, characterized in that: The softened water delivery pipeline includes a main softened water pipe and a softened water bypass connected in parallel with the main softened water pipe; the main softened water pipe is connected to the spray inlet at the middle of the top of the recovery tank, and a softened water regulating valve and two butterfly valves located on both sides of the softened water regulating valve are provided on the pipe section connected in parallel with the softened water bypass; a butterfly valve is also provided on the softened water bypass.

7. The energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of the wire drying machine according to claim 1, characterized in that: The mixed liquid output pipeline forms two parallel mixed liquid output branches. Each mixed liquid output branch is equipped with two butterfly valves and a booster pump, pressure gauge, and check valve arranged sequentially between the two butterfly valves in the direction of flow. The input ends of the two mixed liquid output branches merge to form a mixed liquid input side pipeline, which is connected to the outlet at the bottom of the recovery tank. The output ends of the two mixed liquid output branches merge to form a mixed liquid output side pipeline. The mixed liquid is sent into the condensate network through the mixed liquid output side pipeline equipped with a flow meter and butterfly valve.

8. The energy-saving device for recovering and utilizing waste steam from the high-temperature condensate system of the wire drying machine according to claim 1, characterized in that: It also includes a drain pipe with a ball valve, which is connected in parallel with the mixed liquid input side pipe and connected to the outlet of the recovery tank.

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