A waste heat utilization device for glass manufacturing processes

Abstract

This utility model belongs to the field of waste heat recovery in the glass manufacturing process, and relates to a device for efficient utilization of waste heat in glass manufacturing. It includes a glass melting furnace, a tin bath, an annealing furnace A zone, an annealing furnace B zone, a large waste heat steam boiler, a small waste heat steam boiler, a steam-type lithium bromide unit A, a steam turbine, a generator, a flue gas desulfurization, denitrification, and dust removal device, a gas-water heat exchanger, a hot water-type lithium bromide unit, a flue gas-type lithium bromide unit A, a flue gas-type lithium bromide unit B, and connecting pipelines. This utility model achieves efficient waste heat recovery by repeatedly utilizing the high-temperature flue gas and hot air generated in the glass melting furnace.

Description

Technical Field

[0001] This utility model belongs to the field of process waste heat recovery, and relates to a device for efficient utilization of waste heat in glass manufacturing processes. Background Technology

[0002] The glass industry, being a resource- and energy-dependent high-energy-consuming industry, generates a large amount of waste heat from flue gas during its production process. However, the recovery and utilization of this waste heat is insufficient; the vast majority of it enters waste heat boilers, and the temperature of the flue gas finally released into the atmosphere is around 150°C, resulting in energy waste. Therefore, how to utilize the waste heat from the glass manufacturing process has become an urgent issue to be addressed. Utility Model Content

[0003] To address the above problems, this utility model provides a waste heat utilization device for glass manufacturing processes. It includes a glass melting furnace, a tin bath, an annealing furnace, a waste heat steam boiler, a steam-type lithium bromide unit, a steam turbine, a generator, a flue gas desulfurization, denitrification, and dust removal device, a steam-water heat exchanger, a hot water-type lithium bromide unit, a flue gas-type lithium bromide unit, and connecting pipelines. High-temperature flue gas generated in the glass melting furnace is fed into the waste heat boiler; the generated steam enters the steam turbine to generate electricity. The remaining flue gas, after desulfurization, denitrification, and dust removal treatment, enters the heat exchanger to generate hot water, which is then supplied to the hot water-type lithium bromide unit for cooling and power supply to the factory. Steam is also drawn from the steam turbine to supply cooling to the steam-type lithium bromide unit. High-temperature hot air generated in the annealing furnace is fed into the flue gas-type lithium bromide unit for cooling and power supply to the factory. Another portion of the high-temperature hot air generated in the annealing furnace enters the small waste heat steam boiler; the generated steam is used to supplement the steam turbine for power generation, and the remaining portion is used to supply cooling to the steam-type lithium bromide unit. By repeatedly utilizing the high-temperature flue gas and hot air generated in the glass manufacturing process, the goal of efficiently recovering waste heat can be achieved.

[0004] The technical solution adopted by this utility model to achieve the above-mentioned objectives is: a waste heat high-efficiency utilization device for glass manufacturing process, including a glass melting furnace, a tin bath, an annealing furnace A zone, an annealing furnace B zone, a large waste heat steam boiler, a small waste heat steam boiler, a steam-type lithium bromide unit A, a steam turbine, a generator, a flue gas desulfurization, denitrification and dust removal device, a gas-water heat exchanger, a hot water-type lithium bromide unit, a flue gas-type lithium bromide unit A, a flue gas-type lithium bromide unit B, and connecting pipelines;

[0005] The glass melting furnace is connected to the large waste heat steam boiler via flue gas pipeline A. The large waste heat steam boiler is connected to the flue gas desulfurization, denitrification and dust removal device via flue gas pipeline E. The flue gas desulfurization, denitrification and dust removal device is connected to the gas-water heat exchanger via flue gas pipeline F. The gas-water heat exchanger is connected to the hot water type lithium bromide unit via hot water pipeline. The large waste heat steam boiler is connected to the steam turbine via steam pipeline C. The steam turbine is connected to the generator via a connecting device. The large waste heat steam boiler and the steam type lithium bromide unit A are connected sequentially via steam pipeline A and steam pipeline B.

[0006] The annealing kiln A area is connected to the small waste heat steam boiler via flue gas pipeline B, the small waste heat steam boiler is connected to the steam turbine via steam pipeline D, and the small waste heat steam boiler is connected to the steam-type lithium bromide unit A via steam pipeline E; the annealing kiln A area is connected to the flue gas-type lithium bromide unit A via flue gas pipeline C, and the annealing kiln B area is connected to the flue gas-type lithium bromide unit B via flue gas pipeline D.

[0007] A cold water pipeline A is installed after the hot water type lithium bromide unit.

[0008] A steam control valve A is installed on the steam pipeline C, and a circuit is installed after the generator.

[0009] A steam control valve B is installed on the steam pipeline B, and a cold water pipeline B is installed after the steam-type lithium bromide generator unit A.

[0010] A steam control valve C is installed on the steam pipeline D, and a steam control valve D is installed on the steam pipeline E.

[0011] A cooling water pipeline D is installed after the flue gas type lithium bromide unit A, and a cooling water pipeline C is installed after the flue gas type lithium bromide unit B.

[0012] In operation, this invention involves a glass melting furnace melting glass raw materials and generating high-temperature flue gas at 450-500°C. This high-temperature flue gas enters a large waste heat steam boiler through flue gas pipeline A. The resulting superheated steam at 2.2-2.5 MPa enters a steam-type lithium bromide generator unit through steam pipelines A and B. A steam control valve B is installed on steam pipeline B. Another portion of the superheated steam enters a steam turbine through steam pipeline C, driving the turbine to generate electricity via a connecting device. A steam control valve A is installed on steam pipeline C. The flue gas, at 160-180°C after passing through the large waste heat steam boiler, enters a flue gas desulfurization, denitrification, and dust removal device through flue gas pipeline D. After desulfurization, denitrification, and dust removal, relatively clean flue gas at 140-150°C is generated and enters a gas-water heat exchanger through flue gas pipeline E. Hot water at 95°C is then fed into a hot water-type lithium bromide generator unit to produce chilled water. The resulting chilled water is supplied for use through chilled water pipeline A.

[0013] The 550°C high-temperature hot air generated in zone A3 of the annealing furnace is partially fed into the flue gas-fired lithium bromide unit for cooling via flue gas pipeline C, with the resulting cooling capacity supplied by chilled water pipeline D. Another portion of the high-temperature flue gas is fed into a small waste heat steam boiler via flue gas pipeline B to produce superheated steam at 2.2-2.5 MPa. Part of this superheated steam is fed into the steam turbine via steam pipeline D, while the other part is fed into the steam-fired lithium bromide unit A for cooling via steam pipeline E. A steam control valve C is installed on steam pipeline D, and a steam control valve D is installed on steam pipeline E.

[0014] Hot air at 390°C generated in zone B of the annealing furnace enters the flue gas-fired lithium bromide unit via steam pipeline D to produce chilled water. The produced chilled water is then supplied for use via chilled water pipeline C.

[0015] This invention utilizes the high-temperature flue gas and hot air generated in the glass melting furnace multiple times through the above process to achieve efficient waste heat recovery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the waste heat utilization component for the glass melting furnace section of this utility model.

[0018] Figure 3 This is a schematic diagram of the waste heat utilization component for section A of the annealing kiln according to this utility model.

[0019] Figure 4 This is a schematic diagram of the waste heat utilization component for the B zone of an annealing kiln according to the present invention.

[0020] In the diagram: 1-Glass melting furnace, 2-Tin bath, 3-Annealing furnace A zone, 4-Annealing furnace B zone, 5-Large waste heat steam boiler, 6-Steam type lithium bromide unit A, 7-Steam turbine, 8-Generator, 9-Small waste heat steam boiler, 10-Flue gas type lithium bromide unit A, 11-Flue gas type lithium bromide unit B, 12-Flue gas desulfurization, denitrification and dust removal device, 13-Gas-water heat exchanger, 14-Hot water type lithium bromide unit, 15-Flue gas pipeline A, 16-Steam pipeline A, 17-Steam pipeline B, 18- 19-Steam pipe C, 20-Connecting device, 21-Steam control valve A, 22-Flue gas pipe B, 23-Flue gas pipe C, 24-Steam pipe D, 25-Steam pipe E, 26-Flue gas pipe E, 27-Flue gas pipe F, 28-Hot water pipe, 29-Cold water pipe A, 30-Electric circuit, 31-Cold water pipe B, 32-Cold water pipe C, 33-Cold water pipe D, 34-Steam control valve B, 35-Steam control valve C, 36-Steam control valve D. Detailed Implementation

[0021] The present patent will be further described below with reference to the accompanying drawings and specific embodiments:

[0022] Example 1

[0023] like Figure 1 The device shown is a waste heat utilization device for glass manufacturing process, including a glass melting furnace 1, a tin bath 2, an annealing furnace A zone 3, an annealing furnace B zone 4, a large waste heat steam boiler 5, a small waste heat steam boiler 9, a steam-type lithium bromide unit A6, a steam turbine 7, a generator 8, a flue gas desulfurization, denitrification and dust removal device 12, a gas-water heat exchanger 13, a hot water-type lithium bromide unit 14, a flue gas-type lithium bromide unit A10, a flue gas-type lithium bromide unit B11, and connecting pipelines.

[0024] The glass melting furnace 1 is connected to the large waste heat steam boiler 5 via flue gas pipeline A15. The large waste heat steam boiler 5 is connected to the flue gas desulfurization, denitrification and dust removal device 12 via flue gas pipeline E26. The flue gas desulfurization, denitrification and dust removal device 12 is connected to the gas-water heat exchanger 13 via flue gas pipeline F27. The gas-water heat exchanger 13 is connected to the hot water type lithium bromide unit 14 via hot water pipeline 28. The large waste heat steam boiler 5 is connected to the steam turbine 7 via steam pipeline C18. The steam turbine 7 is connected to the generator 8 via connecting device 19. The large waste heat steam boiler 5 is connected to the steam type lithium bromide unit A6 via steam pipeline A16 and steam pipeline B17 in sequence.

[0025] Annealing kiln A zone 3 is connected to small waste heat steam boiler 9 via flue gas pipeline B21, small waste heat steam boiler 9 is connected to steam turbine 7 via steam pipeline D23, and small waste heat steam boiler 9 is connected to steam-type lithium bromide unit A6 via steam pipeline E25; annealing kiln A zone 3 is connected to flue gas-type lithium bromide unit A10 via flue gas pipeline C22, and annealing kiln B zone 4 is connected to flue gas-type lithium bromide unit B11 via flue gas pipeline D24.

[0026] The hot water type lithium bromide unit 14 is equipped with a cold water pipeline A29.

[0027] A steam control valve A20 is installed on the steam pipeline C18, and a circuit 30 is installed after the generator 8.

[0028] A steam control valve B34 is installed on the steam pipeline B17, and a cold water pipeline B31 is installed after the steam-type lithium bromide generator A6.

[0029] A steam control valve C35 is installed on the steam pipeline D23, and a steam control valve D36 is installed on the steam pipeline E25.

[0030] A cooling water pipeline D33 is installed after the flue gas type lithium bromide unit A10, and a cooling water pipeline C32 is installed after the flue gas type lithium bromide unit B11.

[0031] Example 2

[0032] The specific working process of the waste heat utilization device for glass manufacturing process described in Example 1 is as follows:

[0033] Glass raw materials are melted in glass melting furnace 1, generating high-temperature flue gas at 450-500℃. The high-temperature flue gas enters the large waste heat steam boiler 5 through flue gas pipeline A15. The generated superheated steam at 2.2-2.5MPa enters the steam-type lithium bromide unit 6 through steam pipeline A16 and steam pipeline B17. A steam control valve B34 is installed on steam pipeline B17. Another part of the superheated steam enters the steam turbine 7 through steam pipeline C18, driving the steam turbine to run and generating electricity through the generator 8 via connecting device 19. A steam control valve A20 is installed on steam pipeline C18. The flue gas, at 160-180℃, from the large waste heat steam boiler 5 enters the flue gas desulfurization, denitrification, and dust removal device 12 through flue gas pipeline D24. After desulfurization, denitrification, and dust removal treatment, relatively clean flue gas at 140-150℃ is generated and enters the gas-water heat exchanger 13 through flue gas pipeline E26, obtaining hot water at 95℃. This hot water then enters the hot water type lithium bromide unit 14 through hot water pipeline 28 to produce chilled water. The resulting chilled water is supplied for use through chilled water pipeline A29.

[0034] The 550°C high-temperature hot air generated in zone A3 of the annealing furnace is partially cooled by flue gas through flue gas pipeline C22 into the flue gas-type lithium bromide unit 11, and the resulting cooling capacity is supplied by chilled water pipeline D33. Another portion of the high-temperature flue gas enters the small waste heat steam boiler 9 through flue gas pipeline B21 to produce superheated steam at 2.2-2.5 MPa. Part of the superheated steam is supplied to the steam turbine 7 via steam pipeline D23, and the other part enters the steam-type lithium bromide unit A6 for cooling via steam pipeline E25. A steam control valve C35 is installed on steam pipeline D23, and a steam control valve D36 is installed on steam pipeline E25.

[0035] Hot air at 390°C generated in zone B of the annealing furnace enters the flue gas-fired lithium bromide unit 11 via steam pipeline D24 to produce chilled water. The produced chilled water is then supplied for use via chilled water pipeline C32.

Claims

1. A device for efficient utilization of waste heat in glass manufacturing processes, characterized in that: Includes glass melting furnace (1), tin bath (2), annealing furnace A area (3), annealing furnace B area (4), large waste heat steam boiler (5), small waste heat steam boiler (9), steam type lithium bromide unit A (6), steam turbine (7), generator (8), flue gas desulfurization, denitrification and dust removal device (12), gas-water heat exchanger (13), hot water type lithium bromide unit (14), flue gas type lithium bromide unit A (10), flue gas type lithium bromide unit B (11) and connecting pipelines; The glass melting furnace (1) is connected to the large waste heat steam boiler (5) via flue gas pipeline A (15). The large waste heat steam boiler (5) is connected to the flue gas desulfurization, denitrification and dust removal device (12) via flue gas pipeline E (26). The flue gas desulfurization, denitrification and dust removal device (12) is connected to the gas-water heat exchanger (13) via flue gas pipeline F (27). The gas-water heat exchanger (13) is connected to the hot water type lithium bromide unit (14) via hot water pipeline (28). The large waste heat steam boiler (5) is connected to the steam turbine (7) via steam pipeline C (18). The steam turbine (7) is connected to the generator (8) via connecting device (19). The large waste heat steam boiler (5) is connected to the steam type lithium bromide unit A (6) via steam pipeline A (16) and steam pipeline B (17) in sequence. The annealing kiln A area (3) is connected to the small waste heat steam boiler (9) through flue gas pipeline B (21), the small waste heat steam boiler (9) is connected to the steam turbine (7) through steam pipeline D (23), and the small waste heat steam boiler (9) is connected to the steam type lithium bromide unit A (6) through steam pipeline E (25); the annealing kiln A area (3) is connected to the flue gas type lithium bromide unit A (10) through flue gas pipeline C (22), and the annealing kiln B area (4) is connected to the flue gas type lithium bromide unit B (11) through flue gas pipeline D (24).

2. The waste heat utilization device for glass manufacturing process according to claim 1, characterized in that: A cold water pipeline A (29) is installed after the hot water type lithium bromide unit (14).

3. The waste heat utilization device for glass manufacturing process according to claim 1, characterized in that: A steam control valve A (20) is installed on the steam pipeline C (18), and a circuit (30) is installed after the generator (8).

4. The waste heat utilization device for glass manufacturing process according to claim 1, characterized in that: A steam control valve B (34) is installed on the steam pipeline B (17), and a cold water pipeline B (31) is installed after the steam-type lithium bromide unit A (6).

5. A waste heat utilization device for glass manufacturing process according to claim 1, characterized in that: A steam control valve C (35) is installed on the steam pipeline D (23), and a steam control valve D (36) is installed on the steam pipeline E (25).

6. The waste heat utilization device for glass manufacturing process according to claim 1, characterized in that: A chilled water pipeline D (33) is installed after the flue gas type lithium bromide unit A (10), and a chilled water pipeline C (32) is installed after the flue gas type lithium bromide unit B (11).

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