Technology of using kiln body heat dissipation to increase combustion-supporting air temperature and horizontal flame glass kiln

Abstract

The present invention belongs to the technical field of glass kilns, and specifically relates to a process for increasing the temperature of combustion-supporting wind by heat dissipation from a kiln body and a horizontal flame glass kiln, wherein the process is as follows: the area below the kiln body and between two heat storage chambers is closed, and a vent is left in the closed area; when the kiln is in operation, the heat dissipated from the kiln body is concentrated in the closed area below the kiln body, and the air in the closed area below the kiln body is extracted, and the air in the closed area is used as a source of combustion-supporting wind to increase the temperature of the combustion-supporting wind and transport it into the kiln body. In the glass kiln of the present invention, a left heat storage chamber and a right heat storage chamber are respectively provided on both sides of the kiln body, and a closed area is provided below the kiln body and between the two heat storage chambers, one end of the main induced air duct is placed in the closed area, and the other end is connected to the air intake port of the combustion-supporting fan, and the exhaust port of the combustion-supporting fan is connected to the combustion-supporting air main pipe, and the combustion-supporting air main pipe is connected to the kiln body. By utilizing the heat dissipated from the bottom of the kiln body as the source of the combustion-supporting wind, the temperature of the combustion-supporting wind is significantly increased, thereby reducing the melting unit consumption of the kiln.

Description

Technical Field

[0001] The invention relates to a process for increasing the temperature of combustion-supporting wind by utilizing kiln body heat dissipation and a transverse flame glass kiln, belonging to the technical field of glass kilns. Background Art

[0002] Glass melting furnace is the thermal equipment that consumes the most fuel in the glass factory, generally accounting for about 80-85% of the total energy consumption of the factory. At present, the main energy sources used in the glass industry are coal, oil, electricity and natural gas. The energy consumption of glass production is mainly consumed in the melting process of glass. The purpose of melting glass is to transform multiple solid phase batch materials into a single uniform glass liquid through melting at high temperature. The effective thermal energy utilization rate of glass furnace is only 18-38% on average, and 82-62% cannot be effectively utilized.

[0003] The combustion-supporting fan of the kiln is set up on the ground outside the kiln. The kiln combustion-supporting air is taken from the atmosphere. The four seasons of spring, summer, autumn and winter have a great impact on the air environment temperature. The combustion-supporting fan of large float kilns and photovoltaic kilns is located on the front side of the kiln. Like other fans of the kiln (such as the kiln pool cooling fan), it takes the surrounding air. Generally, no heating device or other facilities are installed. In this way, the change of ambient temperature will directly affect the inlet temperature of the combustion-supporting air. Similarly, the temperature lost by the kiln is diluted in the surrounding air, resulting in a great waste. When the kiln burns, the combustion-supporting air enters the kiln through the regenerator to assist combustion. The regenerator is set in pairs and symmetrically arranged on both sides of the melting furnace. The main function is to keep warm and store heat, preheat the combustion-supporting air passing through, and save the fuel consumption of the kiln. When the combustion-supporting air passes through the regenerator, the regenerator preheats the combustion-supporting air while the regenerator cools the regenerator. Therefore, the temperature of the combustion-supporting air has a key influence on the unit consumption of the kiln. The higher the temperature of the combustion-supporting air, the smaller its cooling capacity for the heat storage chamber, the higher the temperature of the combustion-supporting air entering the kiln, the weaker its ability to cool the kiln temperature, the better the combustion-supporting effect, and the lower the melting unit consumption of the kiln; conversely, if the temperature of the combustion-supporting air decreases, the cooling of the heat storage chamber is enhanced, the temperature of the combustion-supporting air entering the kiln will decrease, and the unit consumption of the kiln will increase.

[0004] Optimizing and increasing the combustion air temperature can reduce the unit consumption of the kiln. Therefore, it is very necessary to optimize and solve the impact of temperature difference on combustion air. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a process and a horizontal flame glass kiln for utilizing kiln body heat dissipation to increase the temperature of combustion-supporting air, absorb and utilize the heat dissipated by the kiln body, increase the temperature of the combustion-supporting air, reduce energy consumption, and improve thermal energy utilization.

[0006] The process of utilizing kiln body heat dissipation to increase the combustion-supporting air temperature described in the present invention includes: sealing the area below the kiln body and between two heat storage chambers, and leaving ventilation holes in the sealed area; when the kiln is in operation, the heat dissipated by the kiln body is concentrated in the sealed area below the kiln body, and the air in the sealed area below the kiln body is extracted and used as a combustion-supporting air source to increase the combustion-supporting air temperature and transport it into the kiln body.

[0007] Due to the heat dissipation of the kiln itself, the temperature under the kiln is higher than the external environment temperature. The lower part of the kiln body is the glass melting pool (such as Figure 5 As shown in the figure, the heat it emits will be concentrated in the space below the kiln body. Closing this space as the source of combustion-supporting air can greatly increase the combustion-supporting air temperature.

[0008] Among them, the ways of conveying combustion-supporting air into the kiln body are as follows: the combustion-supporting air enters the kiln body from the right regenerator to participate in combustion, and the smoke enters the left regenerator from the kiln body and is discharged through the left main flue; after the flame is reversed, the combustion-supporting air enters the kiln body from the left regenerator to participate in combustion, and the smoke enters the right regenerator from the kiln body and is discharged through the right main flue. The combustion-supporting air enters the kiln body along the direction of the flame, so the above two methods are carried out alternately. This can prevent the flame from continuously burning the kiln wall on one side of the kiln body, and prevent the temperature of the kiln wall on one side from being too high, which will affect the life of the kiln.

[0009] A horizontal flame glass kiln that utilizes kiln body heat dissipation to increase combustion-supporting air temperature, with a left heat storage chamber and a right heat storage chamber provided on both sides of the kiln body, a closed area provided below the kiln body and between the two heat storage chambers, one end of the main induced draft pipe placed in the closed area, and the other end connected to the air intake of the combustion-supporting fan, the exhaust port of the combustion-supporting fan connected to the combustion-supporting air main pipe, and the combustion-supporting air main pipe is connected to the kiln body. The combustion-supporting fan extracts air in the closed area below the kiln body through the main induced draft pipe, and transports the air in the closed area into the kiln body as a combustion-supporting air source, so as to significantly increase the combustion-supporting air temperature.

[0010] Among them, the part of the main air duct placed in the closed area is provided with a plurality of air suction ports along its length direction, which can absorb heat from various places in the closed area, which is conducive to the full utilization of thermal energy.

[0011] The left and right sides of the combustion-supporting air main pipe of the present invention are respectively connected to the left regenerator and the right regenerator, the tops of the left regenerator and the right regenerator are both connected to the kiln body, and the combustion-supporting air enters the kiln body through the regenerator.

[0012] The kiln body of the present invention is provided with a left main flue and a right main flue below. The left main flue is provided with a plurality of left branch flues along its length, and the left main flue is connected to the bottom of the left regenerator through the plurality of left branch flues; the right main flue is provided with a plurality of right branch flues along its length, and the right main flue is connected to the bottom of the right regenerator through the plurality of right branch flues. The flue gas enters the flue after passing through the regenerator to retain a portion of the heat in the flue gas.

[0013] Specifically, a number of left combustion-supporting air branch pipes and right combustion-supporting air branch pipes are respectively arranged on the left and right sides of the combustion-supporting air main pipe along its length direction. The left combustion-supporting air branch pipe is connected to the left flue, and the right combustion-supporting air branch pipe is connected to the right flue. The combustion-supporting air main pipe transports combustion-supporting air to the left heat storage chamber and the right heat storage chamber through the left flue and the right flue respectively.

[0014] In addition, the ends of the left main flue and the right main flue are connected to the chimney, and a waste heat power generation boiler is installed at the junction. The heat in the flue gas that is not retained in the heat storage chamber will be reused through the waste heat power generation boiler, further improving the utilization rate of thermal energy.

[0015] In the present invention, the outer wall of the kiln body is provided with a plurality of pool wall cooling air blowing ports, which are used to cool the pool wall of the kiln body, ensure the normal operation of the kiln and extend the service life. The pool wall cooling air blowing ports are oriented toward the outer wall of the kiln body and tilted downward, and while cooling the pool wall, the heat of the pool wall is transferred to the closed area below the kiln body, further recovering heat energy.

[0016] The closed area is provided with a plurality of vents, the positions of which correspond to the positions of the cooling air blowing ports on the pool wall. The cooling air blown out of the cooling air blowing ports on the pool wall passes through the outer wall of the kiln body and then enters the closed area below the kiln body from the vents.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Increase the temperature of the combustion-supporting air and reduce energy consumption: By using the heat dissipated under the kiln as the source of the combustion-supporting air, the temperature of the combustion-supporting air is significantly increased. The increase in the temperature of the combustion-supporting air means that its cooling capacity on the regenerator is weakened, so the temperature of the combustion-supporting air entering the kiln is higher, the combustion-supporting effect is better, and the melting unit consumption of the kiln is reduced.

[0019] 2. Improve the utilization rate of thermal energy: The present invention not only recycles the heat dissipated under the kiln body, but also retains part of the heat in the flue gas through the heat storage chamber, and further recovers the remaining heat in the flue gas by using the waste heat power generation boiler, thereby greatly improving the overall thermal energy utilization rate. Furthermore, by setting the pool wall cooling air blowing port, the pool wall of the kiln body is effectively cooled to ensure the normal operation of the kiln. After the cooling air blown out of the pool wall cooling air blowing port passes through the outer wall of the kiln body, its heat is recovered to the closed area under the kiln body, realizing the reuse of thermal energy.

[0020] 3. Optimize the kiln operating environment and enhance the kiln operating stability: By alternately changing the way the combustion-supporting air enters, the flame in the kiln body is prevented from continuously burning one side of the kiln wall, the stable operation of the kiln is prevented from being affected by the excessive temperature of one side of the kiln wall, and the service life of the kiln is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is one of the process flow diagrams of the present invention;

[0022] Figure 2 This is the second process flow diagram of the present invention;

[0023] Figure 3 is a three-dimensional structural cross-sectional view of the glass furnace of the present invention;

[0024] Figure 4 It is one of the overall structural schematic diagrams of the glass furnace of the present invention;

[0025] Figure 5 is a planar structural sectional view of the glass furnace of the present invention;

[0026] Figure 6 This is the second schematic diagram of the overall structure of the glass furnace of the present invention;

[0027] Figure 7 It is the relationship diagram between the combustion air preheating temperature and the theoretical combustion temperature of the fuel;

[0028] Figure 8 This is a graph showing the relationship between the combustion air preheating temperature and the fuel saving rate.

[0029] In the figure: 1. kiln body; 2. left heat storage chamber; 3. right heat storage chamber; 4. closed area; 5. main induced draft duct; 51. air inlet; 6. combustion-supporting air main pipe; 61. left branch pipe of combustion-supporting air; 62. right branch pipe of combustion-supporting air; 7. left main flue; 71. left branch flue; 8. right main flue; 81. right branch flue; 9. combustion-supporting fan; 10. waste heat power generation boiler; 11. chimney; 12. gate valve; 13. pool wall cooling air outlet. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with specific embodiments.

[0031] However, the description of the present invention is merely an embodiment of structural and even functional description, and the scope of rights of the present invention is not limited by the embodiments described in the text.

[0032] For example, multiple embodiments may have various modifications and various forms, and it should be understood that the scope of rights of the present invention includes equivalents that can implement the technical concept.

[0033] Due to the heat dissipation of the kiln itself, the temperature under the kiln is higher than the external environment temperature. The lower part of the kiln body 1 is a glass melting pool (such as Figure 5 As shown in the figure, the heat emitted by the kiln body 1 is mostly concentrated in the space below the kiln body 1. By sealing the space and using it as a source of combustion-supporting air, the combustion-supporting air temperature can be greatly increased.

[0034] like Figure 1 , 2As shown, the process of using kiln heat dissipation to increase the combustion-supporting air temperature in this embodiment is achieved through the following technical solutions:

[0035] The area below the kiln body 1 and between the two heat storage chambers is sealed, and a vent is left in the sealed area 4; when the kiln is in operation, the heat dissipated by the kiln body 1 is concentrated in the sealed area 4 below the kiln body 1, and the combustion-supporting blower 9 draws the air in the sealed area 4 below the kiln body 1 through the main induced draft duct 5, and uses the air in the sealed area 4 as the combustion-supporting wind source to increase the combustion-supporting wind temperature, and the combustion-supporting wind is transported to the kiln body 1 through the combustion-supporting wind main pipe 6 and the heat storage chamber on one side, and the smoke generated by the kiln body 1 is discharged from the heat storage chamber on the other side through the flue and the chimney 11.

[0036] Among them, the way of conveying combustion-supporting air into the kiln body 1 is divided into: the combustion-supporting air enters the kiln body 1 from the right regenerator 3 through the combustion-supporting air main pipe 6 to participate in combustion, and the smoke enters the left regenerator 2 from the kiln body 1, and is discharged through the left main flue 7 and the chimney 11 (at this time, the passage from the combustion-supporting air main pipe 6 to the left regenerator 2 is closed, and the right main flue 8 is closed); after the flame is reversed, the combustion-supporting air enters the kiln body 1 from the left regenerator 2 through the combustion-supporting air main pipe 6 to participate in combustion, and the smoke enters the right regenerator 3 from the kiln body 1, and is discharged through the right main flue 8 and the chimney 11 (at this time, the passage from the combustion-supporting air main pipe 6 to the right regenerator 3 is closed, and the left main flue 7 is closed); the two ways are performed alternately. By alternating the way the combustion-supporting air enters, it is avoided that the flame in the kiln body continuously burns the kiln wall on one side, and the stable operation of the kiln is prevented from being affected by the excessive temperature of the kiln wall on one side.

[0037] like Figures 3 to 6As shown, in the horizontal flame glass kiln of this embodiment, which utilizes kiln body heat dissipation to increase the temperature of combustion-supporting air, a left heat storage chamber 2 and a right heat storage chamber 3 are respectively provided on both sides of the kiln body 1, and the tops of the left heat storage chamber 2 and the right heat storage chamber 3 are both connected to the kiln body 1. A closed area 4 is set below the kiln body and between the two heat storage chambers. The specific method is to build the kiln body 1 on the first floor, with the kiln bottom below the ground, and the kiln is fully sealed except for the lighting and ventilation shaft; or the kiln body 1 is built on the second floor, and the kiln is enclosed by a door and window factory building. One end of the main induced air duct 5 is placed in the closed area 4, and the part of the main induced air duct 5 placed in the closed area 4 is provided with a plurality of air suction ports 51 along its length direction, and the air suction ports 51 are evenly arranged according to the required combustion-supporting air volume. The other end of the main induced draft pipe 5 is connected to the air inlet of the combustion-supporting fan 9, and the exhaust port of the combustion-supporting fan 9 is connected to the combustion-supporting air main pipe 6. A plurality of left branch pipes 61 and right branch pipes 62 of combustion-supporting air are arranged on the left and right sides of the combustion-supporting air main pipe 6 along its length direction. A left main flue 7 and a right main flue 8 are arranged below the kiln body 1. The left main flue 7 is provided with a plurality of left branch flues 71 along its length direction, and the left main flue 7 is connected to the bottom of the left regenerator 2 through the plurality of left branch flues 71; the right main flue 8 is provided with a plurality of right branch flues 81 along its length direction, and the right main flue 8 is connected to the bottom of the right regenerator 3 through the plurality of right branch flues 81. The left branch pipe 61 of combustion-supporting air is connected to the left branch flue 71, and the right branch pipe 62 of combustion-supporting air is connected to the right branch flue 81. The combustion-supporting air main pipe 6 transports combustion-supporting air to the left regenerator 2 and the right regenerator 3 through the left branch flue 71 and the right branch flue 81, respectively.

[0038] The ends of the left main flue 7 and the right main flue 8 merge into a main flue, which is connected to a chimney 11. A waste heat power generation boiler 10 is arranged in parallel with the main flue, and a gate valve 12 is arranged on the main flue. The flue gas generated by the kiln can be discharged directly from the chimney 11 through the main flue. The gate valve 12 on the main flue can also be closed to allow the flue gas to pass through the waste heat power generation boiler 10 and then be discharged from the chimney 11. The present invention not only recycles the heat dissipated under the kiln body 1, but also retains part of the heat in the flue gas through the heat storage chamber, and further recovers the remaining heat in the flue gas by using the waste heat power generation boiler 10, thereby greatly improving the overall thermal energy utilization rate.

[0039] The outer wall of the kiln body 1 is provided with a plurality of cooling air blowing ports 13, which face the outer wall of the kiln body 1 and are inclined downward. The closed area 4 is provided with a plurality of vents, and the positions of the vents correspond to the positions of the cooling air blowing ports 13. The cooling air blown out of the cooling air blowing ports 13 passes through the outer wall of the kiln body 1 and enters the closed area 4 below the kiln body 1 from the vents. By providing the cooling air blowing ports 13, the pool wall of the kiln body 1 is effectively cooled to ensure the normal operation of the kiln. At the same time, the cooling air blown out of the cooling air blowing ports 13 passes through the outer wall of the kiln body 1, and its heat is recovered to the closed area 4 below the kiln body 1, realizing the reuse of heat energy.

[0040] The present invention utilizes the heat dissipated from the bottom of the kiln body 1 as the wind source for the combustion-supporting air, so as to achieve a balance between the absorbed heat and the normal heat dissipation of the kiln. The heat normally dissipated by the kiln is absorbed and added to the combustion-supporting air, thereby raising the temperature of the combustion-supporting air and reducing the fuel consumption of the kiln, without affecting the production of the kiln.

[0041] 1. The present invention increases the combustion temperature to ensure the necessary furnace temperature. When the theoretical combustion temperature of the fuel is increased, the furnace temperature is also increased.

[0042] Table 1: Theoretical combustion temperature of fuel at different combustion air preheating temperatures

[0043]

[0044] Figure 7 It is a relationship diagram between the preheating temperature of the combustion-supporting air and the theoretical combustion temperature of the fuel. The theoretical combustion temperatures of several fuels after the combustion-supporting air is preheated. In the figure: 1-coke oven gas; 2-mixed gas (coke oven gas and generator gas or blast furnace gas modulated); 3-generator gas; 4-blast furnace gas.

[0045] 2. Save fuel. As the preheating temperature of the combustion air increases, the fuel saving rate also increases accordingly.

[0046] Figure 8 This is a graph showing the relationship between the combustion air preheating temperature and the fuel saving rate. In the graph: 1- fuel oil; 2- coke oven gas; 3- generator gas. It is generally believed that for every 100℃ increase in air preheating temperature, 3-5% of fuel can be saved, which is an effective means of energy saving.

[0047] 3. Reduced carbon emissions. Recovering the heat lost by the kiln can reduce the amount of fuel supplied while keeping the total heat supply unchanged, which means reducing the amount of flue gas generated and emitted. The more heat is recovered, the less flue gas emissions there are, and the more environmentally friendly it is.

[0048] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and equal changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention should all fall within the scope of the patent coverage of the present invention.

Claims

1. A process for increasing the temperature of combustion-supporting air by utilizing kiln heat dissipation, characterized in that: The area below the kiln body (1) and between the two heat storage chambers is sealed, and a vent is left in the sealed area (4); when the kiln is in operation, the heat lost by the kiln body (1) is concentrated in the sealed area (4) below the kiln body (1), and air in the sealed area (4) below the kiln body (1) is extracted and used as a combustion-supporting air source to increase the combustion-supporting air temperature and transport it into the kiln body (1); There are two ways of conveying combustion-supporting air into the kiln body (1): the combustion-supporting air enters the kiln body (1) from the right regenerator (3) to participate in combustion, and the smoke enters the left regenerator (2) from the kiln body (1) and is discharged through the left main flue (7); and the combustion-supporting air enters the kiln body (1) from the left regenerator (2) to participate in combustion, and the smoke enters the right regenerator (3) from the kiln body (1) and is discharged through the right main flue (8); the two ways are performed alternately.

2. A horizontal flame glass kiln that utilizes kiln body heat dissipation to increase the combustion air temperature, characterized in that: A left heat storage chamber (2) and a right heat storage chamber (3) are respectively provided on both sides of the kiln body (1); a closed area (4) is provided below the kiln body and between the two heat storage chambers; one end of a main air duct (5) is placed in the closed area (4) and the other end is connected to the air intake port of a combustion-supporting fan (9); the air outlet of the combustion-supporting fan (9) is connected to a combustion-supporting air main pipe (6); and the combustion-supporting air main pipe (6) is connected to the kiln body (1); a left main flue (7) and a right main flue (8) are provided below the kiln body (1); a plurality of left branch flues (71) are provided along the length direction of the left main flue (7); and the left main flue (7) is connected to the bottom of the left heat storage chamber (2) through the plurality of left branch flues (71); a plurality of right branch flues (81) are provided along the length direction of the right main flue (8); and the right main flue (8) is connected to the bottom of the right heat storage chamber (3) through the plurality of right branch flues (81); The ends of the left main flue (7) and the right main flue (8) are joined and connected to a chimney (11), and a waste heat power generation boiler (10) is provided at the junction; The outer wall of the kiln body (1) is provided with a plurality of cooling air outlets (13), which face the outer wall of the kiln body (1) and are inclined downward; the closed area (4) is provided with a plurality of ventilation openings, the positions of which correspond to the positions of the cooling air outlets (13); the cooling air blown out of the cooling air outlets (13) passes through the outer wall of the kiln body (1) and then enters the closed area (4) below the kiln body (1) from the ventilation openings.

3. The horizontal flame glass kiln for increasing the combustion-supporting air temperature by utilizing kiln body heat dissipation according to claim 2, characterized in that: The portion of the main air duct (5) placed in the closed area (4) is provided with a plurality of air suction ports (51) along its length.

4. The horizontal flame glass kiln for increasing the combustion-supporting air temperature by utilizing kiln body heat dissipation according to claim 2 or 3, characterized in that: The left and right sides of the combustion-supporting air main pipe (6) are respectively connected to the left heat storage chamber (2) and the right heat storage chamber (3), and the tops of the left heat storage chamber (2) and the right heat storage chamber (3) are both connected to the kiln body (1).

5. The horizontal flame glass kiln for increasing the combustion-supporting air temperature by utilizing kiln body heat dissipation according to claim 4, characterized in that: A plurality of left combustion-supporting air branch pipes (61) and right combustion-supporting air branch pipes (62) are arranged on the left and right sides of the combustion-supporting air main pipe (6) along its length direction. The left combustion-supporting air branch pipe (61) is connected to the left branch flue (71), and the right combustion-supporting air branch pipe (62) is connected to the right branch flue (81). The combustion-supporting air main pipe (6) transports the combustion-supporting air to the left heat storage chamber (2) and the right heat storage chamber (3) through the left branch flue (71) and the right branch flue (81), respectively.

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