CN216815067U - Low-temperature flue gas waste heat recycling device for glass kiln - Google Patents

Abstract

The utility model belongs to the technical field of waste heat recovery equipment, and particularly relates to low-temperature flue gas waste heat recovery and utilization equipment for a glass kiln. The equipment is used for recovering the waste heat of the flue gas discharged by the kiln, and comprises a desulfurization, denitrification and dust removal device, a flue gas treatment device and a flue gas treatment device, wherein the desulfurization, denitrification and dust removal device is connected to the kiln and is used for desulfurization, denitrification and dust removal; the primary recovery device is connected to the desulfurization, denitrification and dust removal device and is used for recovering sensible heat in waste heat; the secondary recovery device is used for recovering latent heat in the waste heat and discharging flue gas; the hot water pipe network respectively flows through the primary recovery device and the secondary recovery device and is used for utilizing the waste heat of the primary recovery device and the waste heat of the secondary recovery device. The device can reduce the temperature of the flue gas to about 40 ℃, breaks through the limitation of the traditional concept that the flue gas emission temperature is not lower than 120 ℃, and realizes energy conservation and emission reduction.

Description

Low-temperature flue gas waste heat recycling device for glass kiln

Technical Field

The utility model belongs to the technical field of waste heat recovery equipment, and particularly relates to low-temperature flue gas waste heat recovery and utilization equipment for a glass kiln.

Background

The fuel consumed by glass production accounts for more than 80% of the total energy consumption cost, and 25% -40% of the heat released by the fuel is discharged into the atmosphere along with the glass kiln smoke. The kiln exhaust gas not only takes away a large amount of waste heat resources, but also releases waste heat pollution and atmospheric pollutants such as sulfur dioxide (SO 2), nitrogen oxide (NOx), total suspended particulate matters (TSP) and the like.

Because the kiln flue gas contains the acid gas, if the indirect contact heat exchange mode of the falling film type flue gas heat exchanger is adopted, the recovery and the utilization of waste heat resources are limited, and the metal heat exchange surface of the falling film type flue gas heat exchanger can be corroded, so that the service life of the heat exchanger is greatly reduced.

Accordingly, there is a need for improvement and development in the art.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a low-temperature flue gas waste heat recycling device for a glass kiln, which can fully recycle waste heat in flue gas and prolong the service life of a heat exchanger.

In order to solve the technical problem, the application provides a glass kiln low temperature flue gas waste heat recovery utilizes equipment for retrieve the waste heat of the flue gas that the kiln discharged, include:

the desulfurization, denitrification and dust removal device is connected to the kiln and is used for desulfurization, denitrification and dust removal;

the primary recovery device is connected to the desulfurization, denitrification and dust removal device and is used for recovering sensible heat in waste heat;

the secondary recovery device is used for recovering latent heat in waste heat and discharging flue gas, and comprises a spray heat exchanger, a caustic soda tank and a liquid-liquid heat exchanger, wherein the spray heat exchanger is sequentially provided with an air inlet and an air outlet along the flowing direction of the flue gas, a liquid inlet and a liquid outlet, a nozzle is arranged in the spray heat exchanger, the air inlet of the spray heat exchanger is connected to the primary recovery device, the liquid inlet of the spray heat exchanger is communicated to the caustic soda tank, the liquid-liquid heat exchanger comprises a hot side and a cold side, and the liquid outlet of the spray heat exchanger, the cold side of the liquid-liquid heat exchanger and the nozzle are sequentially communicated through a pipeline;

and the hot water pipe network respectively flows through the primary recovery device and the secondary recovery device and is used for utilizing the waste heat of the primary recovery device and the waste heat of the secondary recovery device.

This application is used for the SOx/NOx control dust removal through SOx/NOx control dust collector, and one-level recovery unit is arranged in retrieving the sensible heat in the waste heat, and second grade recovery unit is arranged in retrieving the latent heat in the waste heat and discharges the flue gas, and the hot-water pipe network is used for utilizing one-level recovery unit and second grade recovery unit's waste heat.

Further, one-level recovery unit includes exhaust-heat boiler, vapour liquid heat exchanger, re-heater and congeals the water tank, exhaust-heat boiler is provided with flue entry, flue export, water inlet and steam outlet, vapour liquid heat exchanger includes hot side and cold side, exhaust-heat boiler's flue entry linkage to SOx/NOx control dust collector, exhaust-heat boiler's steam outlet, vapour liquid heat exchanger's cold side, re-heater, congeal the water tank and exhaust-heat boiler's water inlet circulation intercommunication, the flue export with the air inlet intercommunication of fountain heat exchanger.

The waste heat boiler is adopted to heat water into high-pressure steam, and the steam-liquid heat exchanger is matched with the water in the return pipe of the hot water pipe network for heating.

Further, the reheater is arranged at an exhaust port of the spray type heat exchanger.

The reheater changes the flue gas from a saturated state to an overheated state, thereby avoiding the corrosion of the flue gas by low-temperature flue gas emission.

Further, the vapor-liquid heat exchanger is any one of a shell-and-tube heat exchanger and a steam jet type heat pump.

Further, the vapor-liquid heat exchanger is a vapor jet heat pump.

Further, the liquid-liquid heat exchanger is any one of a plate heat exchanger, a shell-and-tube heat exchanger, a double-tube heat exchanger and a shell-and-tube heat exchanger.

Further, the liquid-liquid heat exchanger is a plate heat exchanger.

Further, second grade recovery unit still includes force (forcing) pump and pH valve sensor, the pH valve sensor set up in the liquid outlet of spray heat exchanger, the force (forcing) pump is located in the alkali lye jar, the force (forcing) pump with the pH valve sensor electrical linkage.

Furthermore, the hot water pipe network comprises a water supply pipe and a water return pipe, and the water return pipe flows through the hot side of the liquid-liquid heat exchanger and the hot side of the vapor-liquid heat exchanger and then flows into the water supply pipe.

Furthermore, an exhaust port of the spray type heat exchanger is connected to a chimney.

Therefore, the device can reduce the temperature of the flue gas to about 40 ℃, breaks through the limitation of the traditional concept that the flue gas emission temperature is not lower than 120 ℃, and realizes energy conservation and emission reduction. Compared with a falling film type flue gas heat exchanger, the spray type heat exchanger cancels a substantial heat exchange surface in a direct contact heat exchange mode, effectively avoids corrosion of a metal heat exchange surface, and greatly prolongs the service life of the heat exchanger. The spraying heat exchanger further reduces the emission concentration of pollutants in the flue gas through secondary washing of the flue gas, and the secondary treatment of the pollutants is realized, thereby achieving the purpose of environmental protection.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present application.

Description of reference numerals: 1. a kiln; 2. a desulfurization, denitrification and dust removal device; 31. a waste heat boiler; 32. a vapor-liquid heat exchanger; 33. a reheater; 34. a water condensing tank; 41. a spray-type heat exchanger; 41A, a nozzle; 42. an alkali liquor tank; 43. a liquid-liquid heat exchanger; 5. a hot water pipe network; 51. a water return pipe; 52. a water supply pipe.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the utility model. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Fig. 1 shows a schematic structural diagram of the low-temperature flue gas waste heat recycling device of the glass kiln. The waste heat recycling equipment comprises a desulfurization and denitrification dust removal device 2, a primary recovery device and a secondary recovery device. The flue gas waste heat comprises sensible heat and latent heat, wherein the sensible heat is absorbed or released heat when a substance does not undergo phase change (solid, liquid and gas conversion); latent heat is the heat absorbed or released by a substance undergoing a phase change process. In order to fully release the waste heat of the flue gas and reduce the temperature of the flue gas to a low enough temperature, in the application, the sensible heat in the flue gas is mainly recovered by the primary recovery device, the latent heat in the flue gas is mainly recovered by the secondary recovery device, the temperature of the flue gas can be reduced to about 40 ℃, the traditional concept that the emission temperature of the flue gas is not lower than 120 ℃ is broken through, and energy conservation and emission reduction are realized.

The utilization forms of the flue gas waste heat of the glass kiln are generally three types: production, preheating of the material or gas flow to the kiln: secondly, the heat exchanger is used for heat exchange, and steam or hot water is generated to be used as heat for production, heating, refrigeration and life; and thirdly, the device is used for a power station or a waste heat power station. In the application, the waste heat of the flue gas of the glass melting furnace is used for heating and domestic heat, such as hot water heating in living areas of office buildings, dormitories and the like.

The kiln 1 of the glass production line can generate atmospheric pollutants such as nitrogen oxides, sulfur dioxide, dust and the like. The nitrogen oxides in the melting furnace flue gas mainly come from combustion products of natural gas, heavy oil and coal fuel and nitrogen oxides generated by violent reaction of nitrogen and oxygen in the air at high temperature when the temperature of the glass melting furnace exceeds 1500 ℃. The main sources of sulfur dioxide in the flue gas are sulfur dioxide generated during the decomposition of mirabilite in the raw materials and sulfur dioxide converted during the combustion of sulfur in fuels (coal, heavy oil and coal tar). The smoke dust in the flue gas mainly comes from ash in fuel, fly ash generated by glass raw materials, steam condensed from combustion products and the like.

In order to avoid the interference (blockage, scaling, corrosion and the like) of pollutants such as nitrogen oxides, sulfur dioxide and dust on subsequent heat energy recovery, the desulfurization, denitrification and dust removal device 2 is firstly utilized to perform desulfurization, denitrification and dust removal treatment on high-temperature flue gas, a cloth bag dust collector can be adopted for dust removal treatment, a limestone-gypsum method desulfurization process can be adopted for desulfurization treatment, the flue gas can be introduced into an SCR reactor for denitrification treatment, the desulfurization, denitrification and dust removal treatment process is the prior art, and the process is not repeated herein.

The temperature of the flue gas after desulfurization, denitrification and dedusting treatment is approximately 250 ℃, and in order to prevent the flue gas temperature from being reduced to below an acid dew point and being atomized into acid liquid to corrode a flue, the flue gas waste heat recovery and utilization are generally controlled to enable the outlet flue gas temperature to be about 160 ℃. The temperature range of the recycled smoke is about 250-160 ℃.

The flue gas in the temperature interval contains a large amount of vaporization sensible heat, so that a primary recovery device is adopted for recovery. The primary recovery device includes a waste heat boiler 31, a vapor-liquid heat exchanger 32, a reheater 33 and a condensate tank 34. The exhaust-heat boiler 31 is a power device that transfers the heat energy of the high-temperature flue gas to water through the heat transfer function, so that the water becomes steam under certain parameters. In this embodiment, the exhaust-heat boiler 31 is a vertical water tube exhaust-heat boiler, which mainly includes the following parts: superheater, evaporator, economizer, feedwater preheater. The exhaust-heat boiler 31 is provided with a flue inlet, a flue outlet, a water inlet and a steam outlet, and high-temperature flue gas flows to the inlet of the exhaust-heat boiler 31 through the flue inlet, passes through a superheater, an evaporator, an economizer and a feed water preheater of the exhaust-heat boiler 31 in sequence, and is discharged from the flue outlet. In the process that the flue gas passes through the superheater, the heating surface pipeline of the vertical water tube waste heat boiler is horizontally arranged, the flue gas vertically flows from top to bottom or from bottom to top, the flue gas scours the outer surface of the tube to transfer heat to steam in the tube, and the steam is conveyed to the steam-liquid heat exchanger 12 through the steam outlet to be recovered. The boiler smoke throughput of the vertical water pipe waste heat boiler is larger, and the generated steam pressure is higher. The temperature of the flue gas inlet of the boiler is about 250 ℃, the temperature of the flue gas outlet is about 160 ℃ and 180 ℃, and the temperature is higher than the acid dew point temperature, so that the flue gas can not be condensed.

Because the steam heat quantity output by the waste heat boiler 31 is high, the flow is small, and the temperature rise is slow, the waste heat boiler cannot be directly used for heating, the steam heat quantity of the boiler is converted into hot water through the heat exchanger to perform heating. The vapor-liquid heat exchanger 32 is a device for transferring heat from the vapor to the water to raise the temperature of the water. The vapor-liquid heat exchanger 32 is commonly used as a shell-and-tube heat exchanger or a steam jet heat pump. The shell-and-tube heat exchanger is the most common heat exchanger, can be used for heat exchange of gas-gas, gas-steam and steam-water, and has the advantages of relatively simple structural form, firmness, durability, low manufacturing cost and strong applicability. In the flue gas heat exchange process, because the steam-water heat exchange heat transfer coefficient is small and the heat exchange efficiency is low, in the embodiment, a steam jet type heat pump is adopted.

The steam jet heat pump is used for supplying heat by consuming high-pressure steam. The steam jet type heat pump mainly comprises an ejector and an evaporator, wherein the evaporator consists of a heating chamber and an evaporation chamber. The heating chamber is used for providing heat required by evaporation to the liquid to promote boiling and vaporization of the liquid; the function of the evaporation chamber is, on the one hand, to provide a place for boiling evaporation of the liquid and, on the other hand, to provide sufficient space for separation of water vapour from the liquid and to minimise entrainment of liquid droplets by the secondary vapour. One end of the evaporation chamber of the evaporator is connected with a return pipe 51 of a hot water pipe network 5 with the water temperature of about 45 ℃, and the other end is connected with a water supply pipe 52 of the hot water pipe network 5. The high-pressure steam from the waste heat boiler 31 enters a nozzle of the ejector, is mixed with the secondary steam from the evaporation chamber of the evaporator at the outlet of the ejector, is compressed in a diffuser of the ejector and then enters a heating chamber of the evaporator. The high pressure steam releases its latent heat in the heating chamber to continue heating the water in the evaporation chamber to a temperature greater than 60 c before being returned to the water supply pipe 52. The high-pressure steam is condensed, and the condensed water flows into the reheater 33 and the condensed water tank 34 to be collected and then is pumped back to the exhaust heat boiler 31 to form a closed cycle process.

The flue gas still contains a small part of acid gas after being treated, and can be discharged after being purified. The secondary recovery device is required to recover latent heat in the waste heat and absorb part of the acid gas to reduce the emission of pollutants.

The secondary recovery device comprises a spray type heat exchanger 41, an alkali liquor tank 42 and a liquid-liquid heat exchanger 43. The shell of the spray type heat exchanger 41 is provided with an air inlet, an air outlet, a liquid inlet and a liquid outlet, the liquid inlet is arranged at the bottom of the spray type heat exchanger 41, the spray type heat exchanger 41 is of a cavity type structure, and the nozzle 41A is suspended at a certain height in the cavity. The liquid outlet is connected with the nozzle 41A through a spray pipeline, and the cooling liquid is pressurized by a water pump at the bottom of the spray heat exchanger 41, sprayed at the top and flows down, and finally flows back to the bottom for recycling. Along with the increase of the spraying height, the contact time of the spraying water and the flue gas is prolonged, so that the spraying water and the flue gas are in more sufficient contact, and the heat recovery is improved.

The heat in the waste heat recovery process in the spray type heat exchanger 41 is divided into two parts, wherein one part is low-temperature water which is sprayed out from the nozzle 41A and enters the spray type flue gas waste heat recovery heat exchanger to directly contact with flue gas with high temperature for heat exchange; the other part is the heat released by continuously introducing the acidic flue gas into the cavity of the spray heat exchanger 41 through the gas inlet, and the flue gas is partially dissolved into the low-temperature water to be acidic and then undergoes a neutralization reaction with the alkaline solution.

When the temperature of the spraying water is higher than the acid dew point temperature of the flue gas (140 ℃ and 160 ℃), only sensible heat in the flue gas can be recovered; when the temperature of spraying water is less than the acid dew point temperature of flue gas, latent heat in a large amount of flue gases is retrieved in the accessible flue gas condensation to spraying the temperature lower, the vapor partial pressure difference between flue gas and the water droplet boundary layer is big more, is favorable to wet exchange, and the moisture in the condensable flue gas is relative more, and latent heat recovery proportion is higher, consequently reduces and sprays the temperature and can show improvement heat exchange efficiency.

In order to reduce the temperature of the spray water as much as possible, a liquid-liquid heat exchanger 43 is provided between the spray pipes to exchange the heat of the spray water into the hot water pipe network 5. The liquid-liquid heat exchanger 43 is provided with a hot side and a cold side, spray water with higher temperature flows into the cold side of the liquid-liquid heat exchanger 43, and a return pipe 51 of the hot water pipe network 5 with lower temperature flows into the hot side of the liquid-liquid heat exchanger 43, so that heating water in the return pipe 51 is heated and flows back to the water supply pipe 52. In this embodiment, the liquid-liquid heat exchanger 43 is a plate heat exchanger, but may be replaced by a shell-and-tube heat exchanger, a double-tube heat exchanger, or a shell-and-tube heat exchanger.

In order to avoid the solution of fountain heat exchanger 41 bottom to be acid corrosion spray piping, install the pH valve sensor at the liquid outlet of fountain heat exchanger 41, the pH valve sensor is according to the regional pH valve of solution of liquid outlet change output signal of telecommunication, and with the force (forcing) pump electrical linkage in the lye tank 42, thereby open the supply of stopping the lye pump control alkaline solution automatically, ensure that entire system is neutral including the liquid that gets into spray piping, avoid system's pipeline and equipment corrosion phenomenon to appear, guarantee the sustainable long-term, safety, steady operation of system. Meanwhile, the neutralization process substantially reduces the emission of pollutants (nitrogen oxides, sulfur dioxide and the like) in the original flue gas, and achieves the aim of emission reduction.

Compared with a falling film type flue gas heat exchanger, the spray type heat exchanger 41 cancels a substantial heat exchange surface in a direct contact heat exchange mode, effectively avoids corrosion of a metal heat exchange surface, and greatly prolongs the service life of the heat exchanger. The spraying heat exchanger further reduces the emission concentration of pollutants in the flue gas through secondary washing of the flue gas, and the secondary treatment of the pollutants is realized, thereby achieving the purpose of environmental protection.

In order to solve the problems of corrosion of facilities and a flue gas discharge port by acid gas with large moisture content, the reheater 33 is arranged at the exhaust port of the spray heat exchanger 41, condensed water of the steam jet heat pump is used as a heat source to heat the flue gas, so that the flue gas is changed from a saturated state to a superheated state, the temperature of the flue gas is increased from about 40 ℃ to about 55 ℃, namely the temperature of the flue gas is increased while the content of water vapor in the flue gas is unchanged, and the relative moisture content of the flue gas is reduced, thereby avoiding the corrosion of the flue gas by low-temperature flue gas discharge.

The gas vent of spray heat exchanger 41 still need insert the chimney and discharge into the atmosphere with the flue gas, and the steam condensation in the flue gas when spraying the cooling makes flue gas volumetric flow reduce, and the velocity of flow reduces, and chimney on the way resistance reduces, and the reduction of chimney on the way resistance can offset because of the flue gas temperature reduces, the chimney is from the adverse effect that the pulling force descends and bring, consequently need not set up the fan alone, reduces the cost of whole equipment.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the utility model.

Claims (10)

1. The utility model provides a glass kiln low temperature flue gas waste heat recovery utilizes equipment for retrieving the waste heat of the flue gas that kiln (1) discharged, its characterized in that includes:

the desulfurization, denitrification and dust removal device (2) is connected to the kiln (1) and is used for desulfurization, denitrification and dust removal;

the primary recovery device is connected to the desulfurization, denitrification and dust removal device (2) and is used for recovering sensible heat in waste heat;

the secondary recovery device is used for recovering latent heat in waste heat and discharging flue gas, and comprises a spray type heat exchanger (41), an alkaline liquor tank (42) and a liquid-liquid heat exchanger (43), wherein the spray type heat exchanger (41) is sequentially provided with an air inlet and an air outlet along the flow direction of the flue gas, and is also provided with an liquid inlet and a liquid outlet, a nozzle (41A) is arranged in the spray type heat exchanger (41), the air inlet of the spray type heat exchanger (41) is connected to the primary recovery device, the liquid inlet of the spray type heat exchanger (41) is communicated to the alkaline liquor tank (42), the liquid-liquid heat exchanger (43) comprises a hot side and a cold side, and the liquid outlet of the spray type heat exchanger (41), the cold side of the liquid-liquid heat exchanger (43) and the nozzle (41A) are sequentially communicated through a pipeline;

and the hot water pipe network (5) respectively flows through the primary recovery device and the secondary recovery device and is used for utilizing the waste heat of the primary recovery device and the waste heat of the secondary recovery device.

2. The glass kiln low-temperature flue gas waste heat recycling device according to claim 1, wherein the primary recycling device comprises a waste heat boiler (31), a steam-liquid heat exchanger (32), a reheater (33) and a water condensing tank (34), the waste heat boiler (31) is provided with a flue inlet, a flue outlet, a water inlet and a steam outlet, the steam-liquid heat exchanger (32) comprises a hot side and a cold side, the flue inlet of the waste heat boiler (31) is connected to the desulfurization and denitrification dust removal device (2), the steam outlet of the waste heat boiler (31), the cold side of the steam-liquid heat exchanger (32), the reheater (33), the water condensing tank (34) and the water inlet of the waste heat boiler (31) are circularly communicated, and the flue outlet is communicated with the air inlet of the spray heat exchanger (41).

3. The glass kiln low-temperature flue gas waste heat recycling device as claimed in claim 2, characterized in that the reheater (33) is arranged at the exhaust port of the spray heat exchanger (41).

4. The glass kiln low-temperature flue gas waste heat recycling device as claimed in claim 2, wherein the vapor-liquid heat exchanger (32) is any one of a shell-and-tube heat exchanger and a steam jet type heat pump.

5. The glass kiln low-temperature flue gas waste heat recycling device as claimed in claim 4, characterized in that the vapor-liquid heat exchanger (32) is a steam jet heat pump.

6. The glass kiln low-temperature flue gas waste heat recycling device according to claim 1, wherein the liquid-liquid heat exchanger (43) is any one of a plate heat exchanger, a shell-and-tube heat exchanger, a double-tube heat exchanger and a shell-and-tube heat exchanger.

7. The device for recycling the low-temperature flue gas waste heat of the glass kiln as recited in claim 6, wherein the liquid-liquid heat exchanger (43) is a plate heat exchanger.

8. The glass kiln low-temperature flue gas waste heat recycling device according to claim 1, wherein the secondary recycling device further comprises a pressure pump and a pH value sensor, the pH value sensor is arranged at a liquid outlet of the spray heat exchanger (41), the pressure pump is arranged in the lye tank (42), and the pressure pump is electrically linked with the pH value sensor.

9. The device for recycling the low-temperature flue gas waste heat of the glass kiln as claimed in claim 2, wherein the hot water pipe network (5) comprises a water supply pipe (52) and a water return pipe (51), and the water return pipe (51) flows into the water supply pipe (52) after flowing through the hot side of the liquid-liquid heat exchanger (43) and the hot side of the vapor-liquid heat exchanger (32).

10. The glass kiln low-temperature flue gas waste heat recycling device as claimed in claim 1, wherein an exhaust port of the spray type heat exchanger (41) is connected to a chimney.

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