Steam condensate water cooling and recycling energy-saving system of air heater in tobacco processing

Abstract

The utility model discloses a steam condensate cooling and recycling energy-saving system of an air heater in tobacco processing, and belongs to the technical field of tobacco processing. The steam condensate cooling and recycling energy-saving system of the air heater in tobacco processing comprises the air heater, a preheating unit and a recycling unit, a steam heat exchange cavity and an air conveying channel are arranged in the air heater, and the preheating unit comprises an air preheater and a first liquid discharging pipeline; one end of the first liquid discharge pipeline is communicated with an outlet of a steam heat exchange cavity of the air heater, the other end of the first liquid discharge pipeline is communicated with an inlet of a condensate water heat exchange cavity of the air preheater, and a drain valve is arranged on the first liquid discharge pipeline; the recycling unit comprises a condensate water recycling pipe and a water collecting tank, one end of the condensate water recycling pipe is communicated with an outlet of the condensate water heat exchange cavity of the air preheater, and the other end of the condensate water recycling pipe is communicated with the water collecting tank. According to the utility model, steam condensate water from the air heater can be reutilized, so that the energy-saving efficiency of the cigarette production line is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of tobacco processing technology especially relates to a steam condensate water cooling and recovery energy saving system of air heater in tobacco processing. BACKGROUND

[0002] The cigarette production line as the core pillar facility in the tobacco industry system, bears the key mission of converting raw tobacco raw materials into finished product cigarettes meeting the standards. It relies on the highly automated, continuous and intelligent precision process flow, realizes the whole chain efficient operation from raw material processing to finished product packaging. In this complex and delicate production system, the drum type moisture regaining machine, the drum type feeding machine and the drum thin plate type cut tobacco machine jointly constitute the indispensable key supporting equipment matrix on the cigarette production line.

[0003] The drum type moisture regaining machine and the drum type feeding machine are the core equipment in the tobacco pretreatment stage. Inside the equipment, hot air with appropriate humidity is precisely controlled and circulated, which penetrates into the fiber structure of tobacco. In this process, the moisture content and temperature of tobacco are significantly improved, and the originally dry and brittle tobacco gradually becomes soft and loose, and its internal toughness is significantly enhanced, thereby greatly improving the tolerance and plasticity of tobacco in the subsequent processing process, laying a solid foundation for the subsequent fine processing. The drum thin plate type cut tobacco machine plays a key role in cut tobacco forming and quality setting. After the cut tobacco is preliminarily processed, it enters the cut tobacco machine, at this time, the hot and dry hot air quickly and effectively removes the excess moisture in the cut tobacco, ensuring that the cut tobacco reaches the ideal dryness. At the same time, by accurately controlling the temperature and flow rate of the hot air, the cut tobacco machine can also maintain the temperature stability of the cut tobacco during moisture removal, avoiding the quality decline of the cut tobacco due to temperature fluctuation, thereby ensuring that each cut tobacco can reach the best state of uniform color, pure aroma and mellow taste.

[0004] In the operation process of the above three key equipment, the hot air heating system is undoubtedly the core power source. The system heats the cold air that has been precisely filtered and adjusted to the precise temperature required by the process through the built-in air heater, providing a stable heat source for the equipment. The heat source of the air heater comes from the process steam, which is an efficient and clean energy form. When high-temperature steam flows through the heater, the latent heat contained in the steam is efficiently transferred to the air flowing through, causing the air temperature to rise rapidly. At the same time, after releasing latent heat, the steam gradually condenses into liquid condensate, which needs to be promptly discharged from the system to prevent damage to the equipment or affect the heating efficiency.

[0005] However, in the process of discharging the condensed water, a physical phenomenon that cannot be ignored quietly occurs - flashing. Due to the significant change of pressure before and after the trap, the internal pressure of the high-temperature condensed water drops suddenly in the moment of passing through the trap, causing part of the condensed water to vaporize instantaneously, forming secondary steam. In this process, not only a large amount of heat is released in disorder, but also the discharge pipeline and the factory environment may be threatened by high temperature, and more seriously, the heat that can be recycled is wasted with the direct discharge of the secondary steam and the high-temperature condensed water, which poses a severe challenge to the energy utilization efficiency and cost control of the enterprise.

[0006] This part provides background information related to the present application, which may not be prior art. Practical new content

[0007] The utility model discloses a kind of steam condensed water cooling recovery energy-saving systems of air heater in tobacco processing, can be secondary utilization from the steam condensed water of air heater, reduce the consumption of energy of air heater, improve the energy-saving efficiency of cigarette production line, and avoid causing discharge pipeline and factory environment high temperature.

[0008] To achieve the above object, the following technical scheme is provided:

[0009] Steam condensed water cooling recovery energy-saving system of air heater in tobacco processing, including air heater, steam heat exchange cavity and air conveying channel are arranged in the air heater, process steam in the steam heat exchange cavity is used to heat the air in the air conveying channel, and further comprising:

[0010] Preheating unit, including air preheater and first liquid discharge pipeline, condensate heat exchange cavity and air transmission channel are arranged in the air preheater, the condensate in the condensate heat exchange cavity is used to preheat the air in the air transmission channel, the output end of the air transmission channel of the air preheater is communicated with the input end of the air conveying channel of the air heater, one end of the first liquid discharge pipeline is communicated with the outlet of the steam heat exchange cavity of the air heater, the other end of the first liquid discharge pipeline is communicated with the inlet of the condensate heat exchange cavity of the air preheater, and the first liquid discharge pipeline is provided with trap;

[0011] Recovery unit, including condensate recovery pipe and water collecting tank, one end of the condensate recovery pipe is communicated with the outlet of the condensate heat exchange cavity of the air preheater, and the other end of the condensate recovery pipe is communicated with the water collecting tank.

[0012] As optional scheme of steam condensed water cooling recovery energy-saving system of air heater in tobacco processing, first stop valve, first filter, trap and first check valve are sequentially arranged on the first liquid discharge pipeline along the extension direction of itself.

[0013] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, the preheating unit further comprises:

[0014] A three-way pipe, a first interface of the three-way pipe being in communication with the outlet of the steam heat exchange cavity of the air heater, and a second interface of the three-way pipe being in communication with the inlet of the condensate water heat exchange cavity of the air preheater;

[0015] A second liquid discharge pipeline, one end of the second liquid discharge pipeline being in communication with the third interface of the three-way pipe, and a condensate water discharge valve being arranged on the second liquid discharge pipeline.

[0016] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, the second liquid discharge pipeline is sequentially provided with a second stop valve, a second filter, the condensate water discharge valve and a second check valve along the direction of the self extension.

[0017] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, the system further comprises a process steam delivery pipeline, one end of the process steam delivery pipeline being in communication with the inlet of the steam heat exchange cavity of the air heater.

[0018] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, a vacuum breaking valve and an air discharge valve are arranged on the process steam delivery pipeline.

[0019] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, the preheating unit is provided with at least two groups, the air preheater of one group of the preheating unit being used for accessing the condensate water from the air heater through the first liquid discharge pipeline, and the air preheater of another group of the preheating unit being used for accessing the condensate water from the cabinet steam cylinder through the first liquid discharge pipeline.

[0020] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, the water collecting tank is provided with an emptying pipeline, the emptying pipeline being in communication with the containing cavity of the water collecting tank.

[0021] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, the water collecting tank is provided with a liquid level sensor and a temperature sensor, and the recovery unit further comprises a condensate water recovery electric pump, the outlet of the water collecting tank being in communication with the condensate water recovery electric pump.

[0022] As an optional solution of the steam condensate water cooling recovery energy-saving system of the air heater in tobacco processing, the recovery unit further comprises:

[0023] A control cabinet, the condensate recovery electric pump, the liquid level sensor and the temperature sensor are electrically connected with the control cabinet.

[0024] Compared with the prior art, the utility model has the advantages of:

[0025] The steam condensate water cooling and recycling energy-saving system of the air heater in the tobacco processing provided by the utility model connects the air preheater of the preheating unit to the front end of the air preheater, that is, the output end of the air transmission channel of the air preheater is communicated with the input end of the air transmission channel of the air heater, so that the air first enters the air preheater for preheating and then enters the air heater for sufficient heating, which not only can utilize the steam condensate water from the air heater twice, reduce the energy consumption of the air heater and improve the energy-saving efficiency of the cigarette production line, but also avoids causing the pollution discharge pipeline and the factory environment to be high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings without paying creative labor.

[0027] Figure 1 It is a schematic view of the steam condensate water cooling and recycling energy-saving system of the air heater in the tobacco processing in the embodiments of the utility model.

[0028] Reference signs:

[0029] 100, air heater; 200, preheating unit; 300, recycling unit; 400, process steam conveying pipeline; 500, cabinet steam cylinder;

[0030] 201, air preheater; 202, first liquid discharge pipeline; 203, drain valve; 204, first stop valve; 205, first filter; 206, first check valve; 207, three-way pipe; 208, second liquid discharge pipeline; 209, condensate discharge valve; 210, second stop valve; 211, second filter; 212, second check valve;

[0031] 301, condensate recovery pipe; 302, water collecting tank; 303, emptying pipe; 304, liquid level sensor; 305, temperature sensor; 306, condensate recovery electric pump; 307, control cabinet;

[0032] 401, vacuum breaking valve; 402, air exhausting valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0035] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0037] In order to be able to condensate water from the steam of the air heater to be used twice, reduce the energy consumption of the air heater, improve the energy efficiency of the cigarette production line, and avoid causing the exhaust pipe and the factory environment to be high temperature, the embodiment provides a steam condensate water cooling and recycling energy-saving system of an air heater in tobacco processing. Figure 1 The specific content of the embodiment is described in detail.

[0038] Referring to Figure 1 The steam condensate water cooling and recycling energy-saving system of the air heater in tobacco processing in the embodiment includes an air heater 100, a preheating unit 200 and a recycling unit 300. The air heater 100 is provided with a steam heat exchange cavity and an air conveying channel. The process steam in the steam heat exchange cavity is used to heat the air in the air conveying channel. The preheating unit 200 includes an air preheater 201 and a first liquid discharge pipeline 202. The air preheater 201 is provided with a condensate water heat exchange cavity and an air transmission channel. The condensate water in the condensate water heat exchange cavity is used to preheat the air in the air transmission channel. The output end of the air transmission channel of the air preheater 201 is in communication with the input end of the air conveying channel of the air heater 100. One end of the first liquid discharge pipeline 202 is in communication with the outlet of the steam heat exchange cavity of the air heater 100. The other end of the first liquid discharge pipeline 202 is in communication with the inlet of the condensate water heat exchange cavity of the air preheater 201. The first liquid discharge pipeline 202 is provided with a drain valve 203. The recycling unit 300 includes a condensate water recycling pipe 301 and a water collecting tank 302. One end of the condensate water recycling pipe 301 is in communication with the outlet of the condensate water heat exchange cavity of the air preheater 201. The other end of the condensate water recycling pipe 301 is in communication with the water collecting tank 302.

[0039] It can be understood that the steam condensate cooling and recycling energy-saving system of the air heater in tobacco processing constructed by the embodiment is a solution integrating efficient heat utilization, water resource recycling, environmental protection and energy saving. The system mainly includes an air heater 100, a preheating unit 200 and a recycling unit 300, which form a complete and closed energy recycling and reuse system. The steam heat exchange cavity and the air conveying channel are arranged in the core component air heater 100, and efficient energy exchange is realized through heat conduction principle. The process steam flows in the steam heat exchange cavity, releases the latent heat contained therein, and accurately transfers the heat to the cold air flowing through the air conveying channel, so that the air temperature rapidly rises to the required level. This process not only ensures the strict control of the hot air temperature on the cigarette production line, but also lays the foundation for the subsequent condensate water recycling and reuse through the full release of steam latent heat. The air preheater 201 of the preheating unit 200 is internally designed with a condensate water heat exchange cavity and an air transmission channel, forming a reverse heat exchange mechanism. The high-temperature condensate water flows out of the steam heat exchange cavity of the air heater 100, is guided through the first drain pipe 202, and enters the condensate water heat exchange cavity of the air preheater 201 at a stable and controllable pressure under the accurate control of the drain valve 203. At this time, the cold air to be heated first enters the air preheater 201 through the air transmission channel, and indirectly exchanges heat with the high-temperature condensate water, pre-absorbing part of the waste heat in the condensate water, and realizing the preliminary preheating of the air. This design not only effectively reduces the heat load of the air heater 100 and reduces energy consumption, but also significantly improves the overall thermal efficiency of the system through the secondary use of condensate water. More importantly, the introduction of the preheating unit 200 fundamentally solves the series of problems caused by the direct discharge of high-temperature condensate water in the traditional cigarette production line. On the one hand, through the reverse heat exchange between the condensate water and the cold air, the temperature of the condensate water is significantly reduced, avoiding the heat pollution caused by direct discharge to the drain pipe and the factory environment, and maintaining the comfort and safety of the production environment. On the other hand, the preheated air has a relatively high initial temperature when it enters the air heater 100, reducing the demand for process steam, thereby reducing energy consumption at the source and improving the energy-saving and emission-reducing level of the cigarette production line. The recycling unit 300 is the final link of the system, responsible for the centralized recycling and reuse of the condensate water after the secondary heat exchange. After releasing the waste heat in the air preheater 201, the temperature of the condensate water is further reduced, but it still contains recyclable value. Through the condensate water recycling pipe 301, these condensate waters are safely and efficiently transported to the water collecting tank 302, realizing the recycling of water resources. This measure not only effectively reduces the waste of water resources in the production process, but also reduces the wastewater discharge cost of the enterprise through centralized treatment and reuse of condensate water.The tobacco processing air heater steam condensate cooling and recovery energy-saving system provided by the embodiment has the advantages that through the synergistic effect of the preheating unit 200 and the recovery unit 300, the waste heat of the process steam condensate water is deeply mined and efficiently utilized, the energy consumption of the cigarette production line is significantly reduced, the thermal efficiency and the water resource utilization rate are improved, and the environmental and cost problems caused by the high-temperature condensate water discharge are fundamentally solved.

[0040] Further, the first drainage pipeline 202 is sequentially provided with a first stop valve 204, a first filter 205, a trap valve 203 and a first check valve 206 in the extension direction of the first drainage pipeline 202. The first stop valve 204 serves as a “master switch” of the first drainage pipeline 202 and undertakes the safety isolation responsibility during equipment maintenance. In the normal operation of the system, the valve is kept fully open to ensure the unobstructed flow of condensate in the pipeline; when the equipment is maintained, repaired or urgently stopped, the operator can quickly close the first stop valve 204 to cut off the condensate flow path, preventing the leakage of high-temperature and high-pressure medium from causing harm to personnel and equipment. The reliable sealing performance and fast response characteristics of the first stop valve 204 provide a basic guarantee for the safe operation of the system, simplify the equipment maintenance process and reduce the time cost of shutdown maintenance. The first filter 205 serves as a “purification checkpoint” in the condensate flow path, and its core function is to intercept solid particle impurities such as pipeline rust, welding slag and scale that may be carried during the condensation process of process steam. If these impurities are not treated and directly enter the trap valve 203, they may cause valve core jamming, sealing surface wear or even blockage, thereby causing problems such as poor drainage, condensate accumulation or steam leakage, which seriously affect the thermal efficiency and equipment life of the system. Through the precise design of the filter screen structure, the first filter 205 can efficiently filter particles greater than 50 microns, ensuring that the condensate enters the downstream equipment in a clean state. The detachable filter element design of the first filter 205 facilitates regular cleaning and maintenance, avoiding system performance degradation caused by impurity accumulation and ensuring the stable operation and efficient heat exchange of the steam condensate recovery system from the source. The trap valve 203 serves as a “smart valve” in the system, and its performance directly determines the timeliness and heat utilization efficiency of condensate drainage. The valve can automatically open and close according to the density difference, temperature difference and pressure difference between condensate and steam through built-in mechanical, thermal static or thermal dynamic structures: when condensate accumulates, the valve opens; when steam approaches, the valve quickly closes. This opening and closing mechanism not only avoids the ineffective discharge of steam, but also ensures the timeliness and thoroughness of condensate drainage, thereby maintaining the optimal heat transfer conditions in the steam heat exchange chamber. By precisely controlling condensate drainage, the trap valve 203 makes the latent heat release of process steam more sufficient, indirectly reducing the steam consumption of the air heater 100, and reducing energy waste and environmental pollution caused by steam leakage. The first check valve 206 serves as a “one-way goalkeeper” at the end of the pipeline, and its core role is to prevent the reverse flow of medium during the condensate recovery process. When the downstream pipeline pressure fluctuates, the pump starts or stops or the valve is operated, causing pressure transients, the valve disc of the first check valve 206 can automatically close to block the medium backflow path, preventing condensate from flowing back to impact the trap valve 203 or entering the steam heat exchange chamber, thereby protecting the trap valve 203 from water hammer damage and maintaining the pressure stability of the steam heating system.The cooperation of the first cut-off valve 204, the first filter 205, the drain valve 203 and the first check valve 206 forms a complete technical chain of the first drain pipeline 202 from medium control, purification treatment to automatic discharge and anti-backflow protection.

[0041] Further, the preheating unit 200 further comprises a tee pipe 207 and a second drain pipeline 208. The first interface of the tee pipe 207 is in communication with the outlet of the steam heat exchange cavity of the air heater 100, and the second interface of the tee pipe 207 is in communication with the inlet of the condensed water heat exchange cavity of the air preheater 201. One end of the second drain pipeline 208 is in communication with the third interface of the tee pipe 207, and the condensed water discharge valve 209 is arranged on the second drain pipeline 208. The tee pipe 207, the second drain pipeline 208 and the condensed water discharge valve 209 of the preheating unit 200 realize directional diversion and pollution risk control of the steam condensed water. The first interface of the tee pipe 207 is directly in communication with the outlet of the steam heat exchange cavity of the air heater 100, the second interface is connected to the inlet of the condensed water heat exchange cavity of the air preheater 201 to form a main path of condensed water transportation, and the third interface is connected to the second drain pipeline 208 as a bypass interface to constitute an emergency discharge branch. During the operation of the equipment, the process steam enters the air heater 100 to complete air heating and is condensed into high-temperature condensed water, which flows into the tee pipe 207 through the outlet of the steam heat exchange cavity. Under normal conditions, the condensed water directly enters the air preheater 201 for waste heat recovery through the first interface→the second interface. During the starting stage, a large amount of low-temperature condensed water is generated in the air heater 100 due to the low initial temperature of the steam system, and impurities or initial condensed water corrosion products may be mixed in the pipeline during this stage, which may cause pollution. At this time, the following mechanisms are used to realize safe discharge: emergency discharge control: the condensed water discharge valve 209 on the second drain pipeline 208 is kept open during the starting stage, so that the low-temperature condensed water that may be contaminated is directly discharged into the waste water system through the third interface of the tee pipe 207; working condition switching: after the temperature of the steam system is stabilized, the condensed water discharge valve 209 is closed, and the condensed water is recovered for waste heat recovery through the air preheater 201.

[0042] Further, the second liquid discharge pipeline 208 is sequentially provided with a second stop valve 210, a second filter 211, a condensate water discharge valve 209 and a second check valve 212 along the direction of its own extension. The second liquid discharge pipeline 208 is an emergency discharge channel for contaminated condensate water in the starting stage, and is sequentially provided with the second stop valve 210, the second filter 211, the condensate water discharge valve 209 and the second check valve 212 along the direction of the medium flow, forming a four-level technical barrier of "cut-off-purification-discharge-prevent reverse", to ensure the safety and reliability of the contaminated condensate water treatment. The condensate water discharge valve 209 is the "master switch" of the second liquid discharge pipeline 208, and undertakes the responsibility of rapid switching of the discharge path in the starting stage and system isolation in daily operation. In the starting stage, the condensate water discharge valve 209 is automatically opened in the initial stage of the steam system temperature rise, to provide an independent discharge channel for contaminated and low-temperature condensate water; in normal operation, when the internal steam pressure of the heater reaches 0.1 MPa, the condensate water discharge valve 209 is automatically closed to cut off the waste water discharge path, to prevent qualified condensate water from being discharged to cause heat loss; in maintenance, the second stop valve 210 can be closed alone to isolate the second liquid discharge pipeline 208, to facilitate the maintenance operation of the downstream condensate water discharge valve 209 and the second filter 211. The second filter 211 provides secondary filtration protection against impurities (particle size usually >100 μm) such as pipeline rust, welding slag and silicate deposits that may be mixed in the condensate water in the starting stage, to prevent the impurities from entering the waste water system or contaminating the downstream equipment. The second check valve 212 is a "one-way safety valve" of the second liquid discharge pipeline 208, to prevent the medium from flowing backward due to pressure fluctuation or siphon effect of the waste water system, and to ensure the stability of the main system pressure.

[0043] Further, the steam condensate water cooling and recovery energy-saving system further comprises a process steam conveying pipeline 400, one end of the process steam conveying pipeline 400 being in communication with the inlet of the steam heat exchange cavity of the air heater 100. The process steam conveying pipeline 400 is the steam supply artery of the system, and one end thereof is directly communicated with the inlet of the steam heat exchange cavity of the air heater 100, to undertake the key function of continuously conveying stable pressure and temperature process steam to the heat exchange cavity. The process steam conveying pipeline 400 is the path of the steam from the steam source to the air heater 100, to ensure the accurate conveying of the process steam according to the set parameters (for example, pressure 0.6-0.8 MPa, temperature 170-180℃). The stable steam supply through the process steam conveying pipeline 400 enables the air heater 100 to efficiently transfer the latent heat of the process steam to the air to be heated, which is the starting end of the steam energy release in the condensate water cooling and recovery process.

[0044] Further, the process steam conveying pipeline 400 is provided with a vacuum breaking valve 401 and an air exhausting valve 402. When the condensate drainage valve is a pressure control valve, the system pressure is low when the machine is started, at this time the air heater 100 internal pressure may be lower than atmospheric pressure, the vacuum breaking valve 401 is automatically opened to introduce air to break the vacuum, and the condensate can be smoothly discharged to the trench through the condensate discharge valve 209. After the equipment runs for a period of time, the condensate temperature rises, at this time the air heater 100 internal pressure also rises, the condensate discharge valve 209 is closed, and the air exhausting valve 402 is opened to exhaust the air in the system. By adding the vacuum breaking valve 401, the vacuum in the air heater 100 during the starting stage is prevented, and the normal discharge of the condensate is ensured. By adding the air exhausting valve 402, the accumulated air in the pipeline is discharged in time during the steam system warming-up stage, and the steam conveying is prevented from being blocked.

[0045] Further, the preheating unit 200 is provided with at least two groups, wherein the air preheater 201 of one group of the preheating unit 200 is used to access the condensate from the air heater 100 through the first drainage pipeline 202, and the air preheater 201 of another group of the preheating unit 200 is used to access the condensate from the cabinet steam cylinder 500 through the first drainage pipeline 202. It can be understood that the number of groups of the preheating unit 200 can be determined according to the actual number of sources of high-temperature condensate, which is not limited here.

[0046] Further, the water collecting tank 302 is provided with a drainage pipe 303 in communication with the containing cavity of the water collecting tank 302, which timely discharges the secondary steam that is not condensed into liquid, avoids the formation of "back pressure" in the water collecting tank 302, and affects the drainage effect of the drain valve 203.

[0047] Further, the water collecting tank 302 is provided with a liquid level sensor 304 and a temperature sensor 305, and the recovery unit 300 further includes a condensate recovery electric pump 306, and the outlet of the water collecting tank 302 is in communication with the condensate recovery electric pump 306. By adding the liquid level sensor 304, the liquid level of the liquid in the water collecting tank 302 is monitored in real time. By adding the temperature sensor 305, the temperature of the liquid in the water collecting tank 302 is monitored in real time. By adding the condensate recovery electric pump 306, the liquid in the water collecting tank 302 can be quickly discharged.

[0048] Further, the recovery unit 300 further comprises a control cabinet 307, the condensate water recovery electric pump 306, the liquid level sensor 304 and the temperature sensor 305 are electrically connected with the control cabinet 307. The condensate water passing through the air preheater 201 is collected to the water collecting tank 302 through the condensate water recovery pipe 301, the water collecting tank 302 is provided with the emptying pipe 303, connected with the atmosphere, at this time, the absolute pressure in the water collecting tank 302 is zero, ensuring that the condensate water can be recovered to the water collecting tank 302 smoothly, the control cabinet 307 collects the signals from the liquid level sensor 304 and the temperature sensor 305, displays the condensate water liquid level and temperature in real time, and according to the liquid level setting parameter, outputs the signal to the condensate water recovery electric pump 306, controls the start and stop of the condensate water recovery electric pump 306, achieves the purposes of air preheating, condensate water and secondary steam cooling, and condensate water recovery.

[0049] It should be noted that the above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A steam condensate cooling and recycling energy saving system for an air heater in tobacco processing, comprising an air heater (100), wherein a steam heat exchange cavity and an air conveying channel are arranged in the air heater (100), and process steam in the steam heat exchange cavity is used to heat air in the air conveying channel, characterized in that, Also comprising: a preheating unit (200) comprising an air preheater (201) and a first liquid discharge pipeline (202), the air preheater (201) is provided with a condensate water heat exchange cavity and an air transmission channel inside, the condensate water inside the condensate water heat exchange cavity is used to preheat the air inside the air transmission channel, the output end of the air transmission channel of the air preheater (201) is in communication with the input end of the air delivery channel of the air heater (100), one end of the first liquid discharge pipeline (202) is in communication with the outlet of the steam heat exchange cavity of the air heater (100), the other end of the first liquid discharge pipeline (202) is in communication with the inlet of the condensate water heat exchange cavity of the air preheater (201), and a drain valve (203) is arranged on the first liquid discharge pipeline (202); a recovery unit (300) comprising a condensate water recovery pipe (301) and a water collecting tank (302), one end of the condensate water recovery pipe (301) is in communication with the outlet of the condensate water heat exchange cavity of the air preheater (201), and the other end of the condensate water recovery pipe (301) is in communication with the water collecting tank (302).

2. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 1, characterized in that, The first liquid discharge pipeline (202) is sequentially provided with a first stop valve (204), a first filter (205), the drain valve (203) and a first check valve (206) along the extension direction of itself.

3. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 1, characterized in that, The preheating unit (200) further comprises: a tee pipe (207), a first interface of the tee pipe (207) is in communication with the outlet of the steam heat exchange cavity of the air heater (100), and a second interface of the tee pipe (207) is in communication with the inlet of the condensate water heat exchange cavity of the air preheater (201); a second liquid discharge pipeline (208), one end of the second liquid discharge pipeline (208) is in communication with a third interface of the tee pipe (207), and a condensate water discharge valve (209) is arranged on the second liquid discharge pipeline (208).

4. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 3, characterized in that, The second liquid discharge pipeline (208) is sequentially provided with a second stop valve (210), a second filter (211), the condensate water discharge valve (209) and a second check valve (212) along the extension direction of itself.

5. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 1, characterized in that, Further comprising a process steam delivery pipeline (400), one end of the process steam delivery pipeline (400) is in communication with the inlet of the steam heat exchange cavity of the air heater (100).

6. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 5, characterized in that, A vacuum breaking valve (401) and an air discharge valve (402) are arranged on the process steam delivery pipeline (400).

7. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 1, characterized in that, The preheating unit (200) is provided with at least two groups, wherein the air preheater (201) of one group of the preheating unit (200) is used to access the condensate water from the air heater (100) through the first liquid discharge pipeline (202), and wherein the air preheater (201) of another group of the preheating unit (200) is used to access the condensate water from the cabinet steam cylinder (500) through the first liquid discharge pipeline (202).

8. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to any one of claims 1-7, characterized in that, The water collecting tank (302) is provided with a venting pipe (303) in communication with the containing cavity of the water collecting tank (302).

9. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 8, characterized in that, The water collecting tank (302) is provided with a liquid level sensor (304) and a temperature sensor (305), and the recovery unit (300) further comprises a condensate water recovery electric pump (306), and an outlet of the water collecting tank (302) is communicated with the condensate water recovery electric pump (306).

10. The tobacco processing air heater steam condensate water cooling recovery energy saving system according to claim 9, characterized in that, The recovery unit (300) further comprises: A control cabinet (307), and the condensate water recovery electric pump (306), the liquid level sensor (304) and the temperature sensor (305) are all electrically connected with the control cabinet (307).

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