Glass kiln flue gas waste heat recovery system and process with purification function

Abstract

The invention provides a glass kiln flue gas waste heat recovery system and process with a purification function. The glass kiln flue gas waste heat recovery system comprises a waste heat boiler system, a desulfurization tower, dust and nitrate integrated equipment, an induced draft fan and a chimney. The waste heat boiler system comprises a first-section waste heat boiler and a second-section waste heat boiler; a flue gas inlet is formed in the bottom of the first-section waste heat boiler, a flue gas outlet is formed in the top of the first-section waste heat boiler and connected with an inlet of the desulfurizing tower through a pipeline, the first-section waste heat boiler and the desulfurizing tower are combined to form an inverted-U-shaped structure, and an outlet of the desulfurizing tower is connected with an inlet of the dust and nitrate integrated device. An outlet of the dust-nitrate integrated equipment is connected with an inlet of the second-section waste heat boiler, and an outlet of the second-section waste heat boiler is connected with the chimney through the induced draft fan. According to the glass kiln flue gas waste heat recovery system and process with the purification function, the problem that temperature and pressure losses are large due to the fact that a flue gas waste heat recovery system in the related technology is complex and tedious in process is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue gas waste heat recovery, and in particular relates to a glass kiln flue gas waste heat recovery system and process with a purification function. Background Art

[0002] Glass melting furnaces are the thermal equipment that consumes the most fuel in a glass factory, generally accounting for about 80-85% of the factory's total energy consumption. The furnace's thermal efficiency is only 20-25%, and the flue gas temperature can reach as high as 400-500°C. This results in a huge waste of energy.

[0003] Currently, the primary energy sources used in my country's glass industry are coal, oil, and natural gas. Due to rising fuel prices, fuel costs for companies have increased annually, leading to a sharp decline in profitability. The flue gases produced by fuel combustion significantly pollute the air. The main pollutants, such as dust, sulfides, and nitrogen oxides, are also the primary components of air pollution. Long-term pollution not only damages the ecological environment but also poses a significant threat to human health and safety.

[0004] Comprehensively utilizing the high-temperature exhaust gases from glass kiln production lines to generate waste heat for power generation, lowering exhaust temperatures, reducing production costs, and improving the company's economic benefits. This system also removes pollutants such as dust, sulfides, and nitrogen oxides from the flue gas, achieving ultra-low emission standards and reducing thermal and environmental pollution. To actively respond to environmental protection needs, we strive to tackle the challenges of air pollution control and contribute to the management and reduction of atmospheric pollutants.

[0005] At present, although my country's glass kiln production line pure waste heat power generation technology and desulfurization, dust removal, and denitrification technology are very mature, the flue gas waste heat recovery system in the relevant technology is complex and the process is cumbersome, resulting in large temperature and pressure losses. In addition, the flue gas waste heat recovery system occupies a large area and has a high investment cost, resulting in increased investment costs and waste of resources. Summary of the Invention

[0006] In view of this, the present invention aims to solve one of the related technical problems at least to a certain extent.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0008] A glass kiln flue gas waste heat recovery system with purification function, including a waste heat boiler system, a desulfurization tower, a dust and saltpeter integrated equipment, an induced draft fan and a chimney;

[0009] The waste heat boiler system includes a first-stage waste heat boiler and a second-stage waste heat boiler;

[0010] A flue gas inlet is provided at the bottom of the first-section waste heat boiler, and a flue gas outlet is provided at the top of the first-section waste heat boiler. The flue gas outlet is connected to the inlet of the desulfurization tower through a pipeline. The first-section waste heat boiler and the desulfurization tower are combined to form an inverted "U"-shaped structure. The outlet of the desulfurization tower is connected to the inlet of the dust and nitrate integrated equipment, and the outlet of the dust and nitrate integrated equipment is connected to the inlet of the second-section waste heat boiler. The outlet of the second-section waste heat boiler is connected to the chimney through the induced draft fan.

[0011] Furthermore, the first-stage waste heat boiler includes a first boiler shell, a boiler drum, a waste heat boiler evaporator and a waste heat boiler superheater. The waste heat boiler evaporator and the waste heat boiler superheater are arranged inside the first boiler shell, and the waste heat boiler evaporator and the waste heat boiler superheater are both connected to the boiler drum.

[0012] Furthermore, an ash outlet is provided at the bottom of the first boiler shell, and an ash pool is provided directly below the ash outlet.

[0013] Furthermore, the second-stage waste heat boiler includes a second boiler shell and a waste heat boiler economizer. The boiler drum is connected to the outlet of the waste heat boiler economizer through a pipeline. The hot water generated by the waste heat boiler economizer is transported to the boiler drum through a steam-water pipeline. A flue gas inlet is provided at the upper part of the waste heat boiler economizer, and a flue gas outlet is provided at the lower part of the waste heat boiler economizer. The flue gas inlet is connected to the flue gas outlet of the dust and saltpeter integrated equipment through a flue, and the flue gas outlet is connected to the induced draft fan through a flue.

[0014] Furthermore, the dust and saltpeter integrated equipment is a catalyst ceramic fiber filter tube dust and saltpeter integrated reactor.

[0015] Furthermore, it also includes an ash silo pump, which is used to collect ash from the ash hopper at the bottom of the desulfurization tower and the dust and saltpeter integrated equipment.

[0016] A glass kiln flue gas waste heat recovery process with purification function, when using the above flue gas waste heat recovery system, includes the following steps:

[0017] Step 1: Open the boiler inlet flue gate valve to allow the high-temperature flue gas of 400-450℃ at the glass kiln flue outlet to slowly enter the first-stage waste heat boiler. Use the induced draft fan to control the boiler inlet pressure to about 200-500Pa, and the flue gas flow rate to 18-20m / s.

[0018] The flue gas flows through the superheater and evaporator in sequence for heat exchange to generate superheated steam. The heat exchange area is designed to reduce the flue gas temperature at the outlet of the evaporator 133 to 330-350°C. The shell flow area of the first stage waste heat boiler is set to ensure a flue gas flow rate of 8-10m / s.

[0019] Step 2: When the flue gas passes through the top and turns to the horizontal short channel, ammonia water and slaked lime powder are sprayed in through the ammonia water nozzle and slaked lime nozzle respectively;

[0020] The flue gas containing slaked lime enters the desulfurization tower. The cross-sectional area inside the tower is increased to reduce the flow rate to 4m / s, and the residence time is ≥6s to ensure that SO2 fully reacts;

[0021] Adjust the amount of slaked lime injected to control the SO2 content at the outlet of the desulfurization tower to less than 50mg / m 3 ;

[0022] Step 3: The flue gas enters the dust and nitrate integrated equipment and is subjected to dust removal and denitrification treatment through ceramic fiber tubes coated with catalysts;

[0023] Control the filtration wind speed to 0.5~0.8m / s, the outlet temperature ≥300℃, and the inlet and outlet pressure difference <2000Pa.

[0024] Reasonably design the dust removal area and catalyst volume to control the outlet dust concentration and NOx concentration to less than 50mg / m 3 ;

[0025] Step 4: The clean flue gas enters the second stage waste heat boiler and exchanges heat with the evaporator, and the temperature drops to below 150°C;

[0026] After cooling, the flue gas is discharged to the chimney through the induced draft fan;

[0027] Step 5: Use the temporary ash outlet and ash pool at the bottom to flush the boiler heating surface with water 2 to 3 times a year. The flushing wastewater is collected in the ash pool and then discharged into the pit;

[0028] Step 6: The dust is collected from the ash outlet at the bottom of the desulfurization tower and the integrated dust and nitrate equipment through a plug-in valve and a silo pump positive pressure dense phase cleaning system, and the dust is transported to the ash storage by compressed air.

[0029] Compared with the prior art, the glass furnace flue gas waste heat recovery system and process with purification function described in the present invention has the following advantages:

[0030] 1. The exhaust gas from the glass kiln's main flue reaches temperatures of up to 400-450°C, offering significant heat recovery value. To address this high-temperature, high-enthalpy flue gas, the system prioritizes the installation of a first-stage waste heat boiler. This utilizes a stepped heat exchange design to efficiently recover waste heat and improve the temperature, pressure, and stability of the waste heat steam.

[0031] 2. Although the clean flue gas temperature after desulfurization, dust removal, and denitrification has dropped to approximately 300°C, it still contains considerable medium- and low-temperature waste heat (approximately 200-300 kJ / kg). By adding a second-stage waste heat boiler, the system can further tap into this low-temperature waste heat resource and achieve cascaded energy utilization.

[0032] 3. This process uses dry desulfurization technology (taking slaked lime injection as an example) to replace traditional wet desulfurization (such as the limestone-gypsum method), which can effectively avoid the negative impact of the wet process on the flue gas temperature, thereby maximizing the retention of waste heat resources and ensuring the heat recovery efficiency of the second-stage waste heat boiler.

[0033] 4. Use integrated dust and nitrate removal equipment to replace the traditional split process of "bag dust collector + independent denitrification tower". Through equipment integration and material innovation, coordinated dust removal and denitrification treatment can be achieved, which greatly reduces investment and operation and maintenance costs.

[0034] 5. By optimizing the flue gas flow between the waste heat boiler and the desulfurization, dust removal and denitrification systems, the process becomes smoother, the system resistance and temperature loss are greatly reduced, the equipment layout is reasonable and compact, and the floor space is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 This is a schematic diagram of a glass kiln flue gas waste heat recovery system with purification function according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Waste heat boiler system; 2. Desulfurization tower; 3. Integrated dust and nitrate removal equipment; 4. Ash silo pump; 5. Induced draft fan; 6. Chimney; 11. First-stage waste heat boiler; 12. Second-stage waste heat boiler; 21. Hydrated lime nozzle; 31. Ammonia nozzle; 131. Waste heat boiler economizer; 132. Boiler drum; 133. Waste heat boiler evaporator; 134. Waste heat boiler superheater. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0043] A glass kiln flue gas waste heat recovery system with purification function, such as Figure 1 As shown, the system comprises a waste heat boiler system 1, a desulfurization tower 2, a dust removal and denitrification integrated device 3, an induced draft fan 5, and a chimney 6. The waste heat boiler system 1 comprises a first-stage waste heat boiler 11 and a second-stage waste heat boiler 12. The first-stage waste heat boiler 11 has a flue gas inlet at its bottom and a flue gas outlet at its top. The flue gas outlet is connected to the inlet of the desulfurization tower 2 via a pipeline. The first-stage waste heat boiler 11 and the desulfurization tower 2 form an inverted "U"-shaped structure. The outlet of the desulfurization tower 2 is connected to the inlet of the dust removal and denitrification integrated device 3, which in turn is connected to the inlet of the second-stage waste heat boiler 12. The outlet of the second-stage waste heat boiler 12 is connected to the chimney 6 via an induced draft fan 5. The induced draft fan provides power for the entire flue gas process. After waste heat recovery, desulfurization, dust removal, and denitrification, the flue gas from the glass kiln becomes clean gas and is discharged into the atmosphere through the chimney. The flue gas inlet of the induced draft fan 5 is connected to the flue gas outlet of the second stage waste heat boiler 12 through a flue, and an electric flue gas valve is installed on the flue. The flue gas outlet of the induced draft fan 5 is connected to the flue gas inlet of the chimney 6, and an electric flue gas valve is also installed on its flue.

[0044] The function of the desulfurization tower 2 is to remove SOx from the flue gas. The desulfurization process of this system adopts slaked lime dry desulfurization technology, that is, the flue gas and the injected slaked lime are fully mixed and reacted to generate calcium sulfate (CaSO4), completing the task of flue gas desulfurization. The desulfurization tower 2 is provided with a flue gas inlet and a flue gas outlet, and the flue gas inlet is connected to the flue gas outlet of the first stage waste heat boiler 11 through a horizontal short channel. In this way, the distance between the desulfurization tower 2 and the first stage waste heat boiler 11 can be shortened in layout, and in structure, the desulfurization tower 2 and the first stage waste heat boiler 11 can share a steel frame to save investment. A slaked lime injection port 21 and an ammonia water injection port 31 are also provided on the horizontal short channel. The slaked lime that has been powdered and tempered enters the horizontal short channel through the slaked lime injection port 21, and then enters the desulfurization tower 2 with the airflow. A 20% ammonia solution enters the flue gas flow through the ammonia water spray port 31 and is thoroughly mixed in the desulfurization tower and the outlet flue, providing a reducing agent for the subsequent denitrification of the dust and nitrate integrated equipment 3. An ash discharge port is also provided at the bottom of the desulfurization tower 2, connected to the ash silo pump 4 via a gate valve and ash discharge piping. The flue gas flow of the desulfurization tower 2 is top-in and bottom-out, connected to the air outlet of the first-stage waste heat boiler 11, smoothing the process flow and reducing system resistance.

[0045] The first-stage waste heat boiler 11 includes a first boiler shell, a boiler drum 132, a waste heat boiler evaporator 133, and a waste heat boiler superheater 134. The waste heat boiler evaporator 133 and the waste heat boiler superheater 134 are disposed within the first boiler shell and are connected to the boiler drum 132. An ash outlet is provided at the bottom of the first boiler shell, and an ash pool is located directly below the ash outlet.

[0046] The first-stage waste heat boiler 11 is provided with a flue gas inlet and a flue gas outlet, and adopts a bottom-in-top-out method. The high-temperature flue gas from the glass kiln enters the flue gas inlet of the first-stage waste heat boiler 11 through the flue gas inlet flue, and performs heat exchange from bottom to top, which fully adapts to the process characteristics of the glass kiln and is beneficial to the layout of the boiler inlet flue and bracket. The pipeline elevation is reduced, saving investment costs. An electric flue gas valve is set on the inlet flue, and the flue gas outlet is connected to the subsequent desulfurization tower 2 through a horizontal short channel. No flue gas valve is set on the horizontal short channel. An ash discharge port is set at the bottom of the first-stage waste heat boiler 11, which is connected to the ash silo pump 4 through a plug-in valve and an ash discharge pipeline.

[0047] The boiler drum is connected to the outlet of the waste heat boiler economizer 131 via a pipe. The hot water generated by the waste heat boiler economizer 131 is transported to the boiler drum 132 via a steam-water pipe. The boiler drum 132 is also equipped with two ports, one connected to the inlet and the other to the outlet of the waste heat boiler evaporator 133 via steam-water pipes. This allows the water in the lower part of the boiler drum to pass through the waste heat boiler evaporator 133 to generate more steam, which is then collected into the steam space above the boiler drum. The upper space of the boiler drum 132 is also equipped with a port, which is connected to the inlet of the waste heat boiler superheater 134 via a steam-water pipe. The steam in the upper space of the boiler drum 132 is superheated by the waste heat boiler superheater 134 to produce qualified steam, which is then transported to subsequent steam-consuming equipment. The boiler drum 132, waste heat boiler evaporator 133, waste heat boiler superheater 134, and steam-water pipe complete the task of converting hot water into qualified steam. The waste heat boiler evaporator 133 can be set in 1 to 3 groups, and the waste heat boiler superheater 134 can be set in 1 to 2 groups, both of which are serpentine tube structures. The waste heat boiler evaporator 133 and the waste heat boiler superheater 134 are specifically set according to the thermal system calculation.

[0048] The second-stage waste heat boiler (HRSG) 12 includes a second boiler shell and a HRSG economizer 131. A boiler drum 132 is connected to the outlet of the HRSG economizer 131 via a pipeline. Hot water generated by the HRSG economizer 131 is transported to the boiler drum 132 via a steam-water pipeline. A flue gas inlet is located at the top of the HRSG economizer 131, and a flue gas outlet is located at the bottom. The flue gas inlet is connected to the flue gas outlet of the dust and saltpeter integrated device 3 via a flue. The flue gas outlet is located at the bottom of the HRSG 131 and is connected to the induced draft fan 5 via a flue. An electric flue gas damper is installed on the flue. The subsequent induced draft fan 5 is connected to the chimney 6 via the flue, and this flue is also equipped with an electric flue gas regulating valve.

[0049] The waste heat boiler economizer 131 can be configured in one to three groups based on thermal system calculations. Its function is to utilize the waste heat from the glass kiln's low-temperature flue gas to convert cold water into hot water. The waste heat boiler economizer 131 is equipped with a water inlet and outlet. The inlet provides water to the waste heat recovery system through the main water supply pipe, while the outlet is connected to the boiler drum 132 via a steam-water pipe, delivering the hot water generated by the economizer to the boiler drum 132.

[0050] In this example, the dust and nitrate integrated device 3 is a catalytic ceramic fiber filter tube dust and nitrate integrated reactor. The main function of the dust and nitrate integrated device 3 is to collect dust in the glass kiln flue gas and the slaked lime and calcium sulfate (CaSO4) that have not settled in the desulfurization tower and are collected and transported away by the ash hopper pump 4, thereby achieving dust removal. It also selectively catalytically reduces NOx in the flue gas to produce N2 and H2O, completing the denitrification task. It also assists in desulfurization. The dust and nitrate integrated device 3 is a catalytic ceramic fiber filter tube dust and nitrate integrated reactor. It is different from traditional bag dust collectors. It is a dry ceramic fiber filter tube installed in air pollution control equipment, which is directly installed on the orifice plate of the dust collector. The ceramic fiber filter tube replaces the filter bag, and a fiber layer containing a denitrification catalyst is applied to the inner wall of the ceramic tube. After the flue gas flows into the tube through the pores in the ceramic tube wall, it achieves the purpose of dust removal and then undergoes a denitrification reaction with the catalyst contained in the fiber layer, thereby completing the flue gas deNOx task. The integrated dust and saltpeter equipment 3 is equipped with a flue gas inlet and outlet. The flue gas inlet is connected to the flue gas outlet of the desulfurization tower 2 via a flue, which is equipped with an electric flue gas valve. The flue gas outlet is connected to the flue gas inlet of the second-stage waste heat boiler 12 via a flue, which is also equipped with an electric flue gas valve. According to design calculations, the integrated dust and saltpeter equipment 3 is equipped with at least three reaction chambers, each of which is equipped with an ash discharge port below, connected to the ash silo pump 4 via a gate valve and ash discharge pipeline.

[0051] It also includes an ash bin pump 4, which is used to collect the ash from the ash hopper at the bottom of the desulfurization tower 2 and the dust and saltpeter integrated equipment 3, and transport it to the ash bin for storage through subsequent pneumatic ash conveying, hoisting equipment and other equipment.

[0052] How this example works

[0053] A glass kiln flue gas waste heat recovery process with purification function, when using the above flue gas waste heat recovery system, includes the following steps:

[0054] Step 1: Open the boiler inlet flue gate valve to allow the high-temperature flue gas of 400-450°C at the glass kiln flue outlet to slowly enter the first-stage waste heat boiler 11. Control the boiler inlet pressure to about 200-500 Pa through the induced draft fan 5, and control the flue gas flow rate to 18-20 m / s.

[0055] The flue gas flows through the superheater and evaporator in sequence for heat exchange to generate superheated steam. The heat exchange area is designed to reduce the flue gas temperature at the outlet of the evaporator 133 to 330-350°C. The shell flow area of the first stage waste heat boiler 11 is set to ensure a flue gas flow rate of 8-10m / s.

[0056] Step 2: When the flue gas passes through the top and turns to the horizontal short channel, ammonia water and slaked lime powder are sprayed in through the ammonia water nozzle 31 and slaked lime nozzle 21 respectively;

[0057] The flue gas containing slaked lime enters desulfurization tower 2. The cross-sectional area inside the tower is increased to reduce the flow rate to 4m / s, and the residence time is ≥6s to ensure that SO2 fully reacts;

[0058] Adjust the amount of slaked lime injected to control the SO2 content at the outlet of desulfurization tower 2 to less than 50mg / m 3 ;

[0059] Step 3: The flue gas enters the dust and nitrate integrated equipment 3 and is subjected to dust removal and denitration treatment through a ceramic fiber tube coated with a catalyst;

[0060] Control the filtration wind speed to 0.5~0.8m / s, the outlet temperature ≥300℃, and the inlet and outlet pressure difference <2000Pa.

[0061] Reasonably design the dust removal area and catalyst volume to control the outlet dust concentration and NOx concentration to less than 50mg / m 3 ;

[0062] Step 4: The clean flue gas enters the second stage waste heat boiler 12 and exchanges heat with the evaporator, and the temperature drops to below 150°C;

[0063] After cooling, the flue gas is discharged to the chimney 6 through the induced draft fan 5;

[0064] Step 5: Use the temporary ash outlet and ash pool at the bottom to flush the boiler heating surface with water 2 to 3 times a year. The flushing wastewater is collected in the ash pool and then discharged into the pit;

[0065] Step 6: The dust is collected from the ash outlet at the bottom of the desulfurization tower 2 and the integrated dust and nitrate equipment through a plug-in valve and a silo pump positive pressure dense phase cleaning system, and the dust is transported to the ash storage by compressed air.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A glass kiln flue gas waste heat recovery system with purification function, characterized by: It includes a waste heat boiler system (1), a desulfurization tower (2), a dust and saltpeter integrated device (3), an induced draft fan (5) and a chimney (6); The waste heat boiler system (1) comprises a first-stage waste heat boiler (11) and a second-stage waste heat boiler (12); A flue gas inlet is provided at the bottom of the first-stage waste heat boiler (11), and a flue gas outlet is provided at the top of the first-stage waste heat boiler (11). The flue gas outlet is connected to the inlet of the desulfurization tower (2) through a pipeline. The first-stage waste heat boiler (11) and the desulfurization tower (2) are combined to form an inverted "U"-shaped structure. The outlet of the desulfurization tower (2) is connected to the inlet of the dust and nitrate integrated equipment (3), and the outlet of the dust and nitrate integrated equipment (3) is connected to the inlet of the second-stage waste heat boiler (12). The outlet of the second-stage waste heat boiler (12) is connected to the chimney (6) through the induced draft fan (5).

2. The glass furnace flue gas waste heat recovery system with purification function according to claim 1, characterized in that: The first-stage waste heat boiler (11) comprises a first boiler shell, a boiler drum (132), a waste heat boiler evaporator (133) and a waste heat boiler superheater (134); the waste heat boiler evaporator (133) and the waste heat boiler superheater (134) are arranged inside the first boiler shell, and the waste heat boiler evaporator (133) and the waste heat boiler superheater (134) are both connected to the boiler drum (132).

3. The glass furnace flue gas waste heat recovery system with purification function according to claim 2, characterized in that: An ash outlet is provided at the bottom of the first boiler shell, and an ash pool is provided directly below the ash outlet.

4. The glass furnace flue gas waste heat recovery system with purification function according to claim 2, characterized in that: The second section waste heat boiler (12) includes a second boiler shell and a waste heat boiler economizer (131), the boiler drum (132) is connected to the outlet of the waste heat boiler economizer (131) through a pipeline, the hot water generated by the waste heat boiler economizer (131) is transported to the boiler drum (132) through a steam-water pipeline, the waste heat boiler economizer (131) is provided with a flue gas inlet at the top, and the waste heat boiler economizer (131) is provided with a flue gas outlet at the bottom, the flue gas inlet is connected to the flue gas outlet of the dust and saltpeter integrated equipment (3) through a flue, and the flue gas outlet is connected to the induced draft fan (5) through a flue.

5. A glass furnace flue gas waste heat recovery system with purification function according to any one of claims 1 to 4, characterized in that: The dust and saltpeter integrated equipment (3) is a catalyst ceramic fiber filter tube dust and saltpeter integrated reactor.

6. The glass furnace flue gas waste heat recovery system with purification function according to claim 5, characterized in that: It also includes an ash conveying silo pump (4), which is used to collect ash from the ash hopper at the bottom of the desulfurization tower (2) and the dust and saltpeter integrated equipment (3).

7. A glass kiln flue gas waste heat recovery process with purification function, characterized by: When using the flue gas waste heat recovery system according to claim 6, the following steps are included: Step 1: Open the boiler inlet flue gate valve to allow the high-temperature flue gas of 400-450°C at the glass kiln flue outlet to slowly enter the first stage waste heat boiler (11). The boiler inlet pressure is controlled to about 200-500 Pa by the induced draft fan (5), and the flue gas flow rate is controlled to 18-20 m / s. The flue gas flows through the superheater and evaporator in sequence for heat exchange to generate superheated steam. The heat exchange area is designed so that the flue gas temperature at the outlet of the evaporator 133 is reduced to 330-350°C. The shell flow area of the first stage waste heat boiler (11) is set to ensure that the flue gas flow rate is 8-10m / s. Step 2: When the flue gas passes through the top and turns to the horizontal short channel, ammonia water and slaked lime powder are sprayed in through the ammonia water nozzle (31) and the slaked lime nozzle (21) respectively; The flue gas containing slaked lime enters the desulfurization tower (2). The cross-sectional area inside the tower is increased to reduce the flow rate to 4 m / s, and the residence time is ≥ 6 s to ensure that SO2 fully reacts; Adjust the amount of slaked lime injected to control the SO2 content at the outlet of the desulfurization tower (2) to less than 50mg / m 3 ; Step 3: The flue gas enters the dust and nitrate integrated equipment (3) and is subjected to dust removal and denitration treatment through a ceramic fiber tube coated with a catalyst; Control the filtration wind speed to 0.5~0.8m / s, the outlet temperature ≥300℃, and the inlet and outlet pressure difference <2000Pa. Reasonably design the dust removal area and catalyst volume to control the outlet dust concentration and NOx concentration to less than 50mg / m 3 ; Step 4: The clean flue gas enters the second stage waste heat boiler (12) and exchanges heat with the evaporator, and the temperature drops to below 150°C; After cooling, the flue gas is discharged to the chimney (6) through the induced draft fan (5); Step 5: Use the temporary ash outlet and ash pool at the bottom to flush the boiler heating surface with water 2 to 3 times a year. The flushing wastewater is collected in the ash pool and then discharged into the pit; Step 6: The dust is collected from the ash outlet at the bottom of the desulfurization tower (2) and the dust and nitrate integrated equipment through a plug-in valve and a silo pump positive pressure dense phase cleaning system, and the dust is transported to the ash storage by compressed air.

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