Efficient, energy-saving and emission-reducing glass production process system

Abstract

The invention provides an efficient, energy-saving and emission-reducing glass production process system, and relates to the technical field of glass production and energy conservation and emission reduction of combustion flue gas. The efficient, energy-saving and emission-reducing glass production process system is characterized in that a mixture of silica sand, sodium salt and other raw materials directly enters an efficient rotary kiln for preheating and decomposing by waste heat of a high-temperature glass firing kiln, and the preheated and decomposed material falls into the high-temperature glass firing kiln to complete high-temperature calcination; the flue gas enters a glass manufacturing production line to be manufactured into glass products, the flue gas subjected to high-temperature calcination is subjected to primary denitration and then enters a waste heat boiler system to recover heat for power generation and the like, the flue gas subjected to waste heat recovery enters a preheating decomposition efficient rotary kiln at a proper temperature, and then the flue gas is subjected to heat recovery, desulfurization, secondary denitration and dust removal through a waste heat boiler and then is discharged. The waste heat of the high-temperature firing kiln is used for preheating and decomposing materials in the independent rotary kiln, and the secondary waste heat boiler and the like are matched for recycling heat, so that the heat energy utilization rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of glass production and combustion smoke energy conservation and emission reduction, and in particular to a glass production process system with high efficiency, energy conservation and emission reduction. Background Art

[0002] Glass is an amorphous solid that melts at high temperatures, and the viscosity of the melt gradually increases during the cooling process, does not crystallize, and maintains the melt structure at room temperature. The glass industry has the characteristics of high energy consumption and large resource consumption. With the increasing shortage of energy and the intensification of environmental pollution, energy conservation and emission reduction have become two binding indicators for glass companies. The energy consumption of glass companies is mainly consumed in the process of melting glass. In actual production, glass companies grasp the energy conservation of melting furnaces, which means they have grasped the theme of energy conservation in the industry. At present, the focus of energy conservation in glass companies is to strengthen the sealing of melting furnaces, strengthen the insulation of melting furnaces, recycle the waste heat of flue gas, strengthen the control of chemical production processes, and adopt new combustion technologies such as full oxygen calcined glass production.

[0003] Currently, there are few production processes that systematically improve existing glass production lines. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies of the prior art, the present invention provides a glass production process system with high efficiency, energy saving and emission reduction. In addition to adopting new combustion technologies such as all-oxygen calcined glass production, improvements are also made to the production process. The energy consumption of the fuel gas and air used for preheating and decomposition in the kiln in the original glass production process is solved, and the energy consumption of heating the gas and air with the waste heat of the high-temperature kiln is reduced. By using the waste heat of the high-temperature kiln to preheat and decompose the material in an independent rotary kiln, and recovering heat with a secondary waste heat boiler, the utilization rate of thermal energy is improved. The high-temperature kiln provides an important guarantee for the stable improvement of product quality by using oxygen-enriched or all-oxygen calcination technology. Nitrogen oxide emissions can be greatly reduced by secondary denitrification of flue gas at high and medium temperatures.

[0005] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: A glass production process system with high efficiency, energy saving and emission reduction, comprising the following steps: S1. Prepare a mixture with suitable particle size by mixing silica sand, soda ash, sodium sulfate, crude salt, dolomite and limestone according to the raw materials; S2, directly putting the mixed material into a high-efficiency rotary kiln for preheating and decomposition, wherein the heat for preheating and decomposition in the rotary kiln comes from the waste heat recovered from the high-temperature glass firing kiln, and the waste heat temperature is 650°C to 1050°C; S3, the preheated and decomposed material falls into a high-temperature glass-making kiln to complete high-temperature calcination, wherein the fuel used for the high-temperature calcination is coal gas, and the combustion-supporting gas is oxygen-enriched air or full oxygen; S4, after the materials are calcined in the high-temperature glass-making kiln, they enter the glass manufacturing production line for molding and processing into glass products; S5. The flue gas after high-temperature calcination enters the first-level waste heat boiler system to recover heat after the first-level denitrification. The flue gas after waste heat recovery enters the preheating decomposition high-efficiency rotary kiln at a temperature of 650℃~1050℃, and then the flue gas recovers heat through the second-level waste heat boiler. The flue gas after the second-level waste heat boiler is desulfurized, second-level denitrified and dust removed before being discharged from the chimney.

[0006] Preferably, in S2, the mixed material is preheated in a preheating and decomposition high-efficiency rotary kiln and a decomposition reaction occurs. The liquid phase containing sodium salt and halogen is wrapped by the siliceous component. The liquid phase is reduced by controlling the appropriate ratio to prevent coking and damage to the refractory material. The main reaction formula is as follows: Na 2 CO 3 =Na 2 O+CO 2 CaCO 3 =CaO+CO 2 .

[0007] Preferably, in S2, the preheating and decomposition high-efficiency rotary kiln is produced in a closed kiln.

[0008] Preferably, in S3, the main reaction of the preheated and decomposed material in the high-temperature glass sintering furnace is as follows: Na 2 CO 3 +SiO 2 =Na 2 SiO 3 +CO 2 CaCO 3 +SiO 2 =CaSiO 3 +CO 2 Na 2 O+SiO 2 =Na 2 SiO 3 CaO+SiO 2 =CaSiO 3 .

[0009] Preferably, in S3, the oxygen content in the oxygen-enriched air is above 85%.

[0010] (III) Beneficial effects The present invention provides a glass production process system with high efficiency, energy saving and emission reduction, which has the following beneficial effects: 1. The present invention solves the problem of the original glass production process where the preheating and decomposition fuel gas and air are constantly switched in the kiln, and reduces the energy consumption of using the waste heat of the high-temperature kiln to heat the gas and air. The material is preheated and decomposed in an independent rotary kiln using the waste heat of the high-temperature kiln, and the heat is recovered by using a secondary waste heat boiler, etc., which improves the utilization rate of thermal energy.

[0011] 2. The high temperature firing kiln of the present invention provides an important guarantee for the stable improvement of product quality by using an oxygen-enriched or full oxygen calcination process.

[0012] 3. The present invention can greatly reduce nitrogen oxide emissions through high-temperature and medium-temperature secondary denitrification of flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1: like Figure 1 As shown, an embodiment of the present invention provides a glass production process system with high efficiency, energy saving and emission reduction, comprising the following steps: S1. Prepare a mixture with suitable particle size by mixing silica sand, soda ash, sodium sulfate, crude salt, dolomite, limestone and other raw materials according to the ratio; S2. Directly put the mixed material into a closed preheating and decomposition high-efficiency rotary kiln. The preheating and decomposition high-efficiency rotary kiln is produced by a closed kiln. The heat for preheating and decomposition in the rotary kiln comes from the waste heat recovered from the high-temperature glass sintering kiln. The waste heat temperature is 650°C. The mixed material is preheated and decomposed in the preheating and decomposition high-efficiency rotary kiln. The liquid phase containing sodium salts and halogens is wrapped by siliceous components. By controlling the appropriate ratio, the liquid phase can be reduced to prevent coking and damage to refractory materials. The main reaction formula is as follows: Na 2 CO 3 =Na 2 O+CO 2 CaCO 3 =CaO+CO 2 ; S3. The preheated and decomposed materials fall into a high-temperature glass-making kiln for high-temperature calcination. The fuel used for high-temperature calcination is coal gas, and the combustion-supporting gas is oxygen-enriched air. The oxygen content in the combustion-supporting oxygen-enriched air is controlled at 85% or above. The main reactions are as follows: Na 2 CO 3 +SiO 2 =Na 2 SiO 3 +CO 2 CaCO 3 +SiO 2 =CaSiO 3 +CO 2 Na 2 O+SiO 2 =Na 2 SiO 3 CaO+SiO 2 =CaSiO 3 ; S4, after the materials are calcined in the high-temperature glass-making kiln, they enter the glass manufacturing production line for molding and processing into glass products; S5. The flue gas after high-temperature calcination enters the first-level waste heat boiler system to recover heat after the first-level denitrification for power generation; the flue gas after waste heat recovery enters the preheating decomposition high-efficiency rotary kiln at a temperature of 650°C, and then the flue gas recovers heat through the second-level waste heat boiler. The recovered heat is preferentially used for power generation and energy storage for self-use; the flue gas after the second-level waste heat boiler is discharged from the chimney after desulfurization, second-level denitrification and dust removal.

[0016] Embodiment 2: like Figure 1 As shown, an embodiment of the present invention provides a glass production process system with high efficiency, energy saving and emission reduction, comprising the following steps: S1. Prepare a mixture with suitable particle size by mixing silica sand, soda ash, sodium sulfate, crude salt, dolomite, limestone and other raw materials according to the ratio; S2. Directly put the mixed material into a closed preheating and decomposition high-efficiency rotary kiln. The preheating and decomposition high-efficiency rotary kiln is produced by a closed kiln. The heat for preheating and decomposition in the rotary kiln comes from the waste heat recovered from the high-temperature glass sintering kiln. The waste heat temperature is 850°C. The mixed material is preheated and decomposed in the preheating and decomposition high-efficiency rotary kiln. The liquid phase containing sodium salts and halogens is wrapped by siliceous components. By controlling the appropriate ratio, the liquid phase can be reduced to prevent coking and damage to refractory materials. The main reaction formula is as follows: Na 2 CO 3 =Na 2 O+CO 2 CaCO 3 =CaO+CO 2 ; S3. The preheated and decomposed materials fall into a high-temperature glass-making kiln for high-temperature calcination. The fuel used for high-temperature calcination is coal gas, and the combustion-supporting gas is oxygen-enriched air or full oxygen. The oxygen content in the combustion-supporting oxygen-enriched air is controlled at 95% or above. The main reactions are as follows: Na 2 CO 3 +SiO 2 =Na 2 SiO 3 +CO 2 CaCO 3 +SiO 2 =CaSiO 3 +CO 2 Na 2 O+SiO 2 =Na 2 SiO 3 CaO+SiO 2 =CaSiO 3 ; S4, after the materials are calcined in the high-temperature glass-making kiln, they enter the glass manufacturing production line for molding and processing into glass products; S5. The flue gas after high-temperature calcination enters the first-level waste heat boiler system to recover heat after the first-level denitrification for power generation; the flue gas after waste heat recovery enters the preheating decomposition high-efficiency rotary kiln at a temperature of 850°C, and then the flue gas recovers heat through the second-level waste heat boiler. The recovered heat is preferentially used for power generation and energy storage for self-use; the flue gas after the second-level waste heat boiler is discharged from the chimney after desulfurization, second-level denitrification and dust removal.

[0017] Embodiment three: like Figure 1 As shown, an embodiment of the present invention provides a glass production process system with high efficiency, energy saving and emission reduction, comprising the following steps: S1. Prepare a mixture with suitable particle size by mixing silica sand, soda ash, sodium sulfate, crude salt, dolomite, limestone and other raw materials according to the ratio; S2. Directly put the mixed material into the closed preheating and decomposition high-efficiency rotary kiln. The preheating and decomposition high-efficiency rotary kiln is produced by a closed kiln. The heat for preheating and decomposition in the rotary kiln comes from the waste heat recovered from the high-temperature glass sintering kiln. The waste heat temperature is 1050°C. The mixed material is preheated and decomposed in the preheating and decomposition high-efficiency rotary kiln. The liquid phase containing sodium salts and halogens is wrapped by siliceous components. By controlling the appropriate ratio, the liquid phase can be reduced to prevent coking and damage to refractory materials. The main reaction formula is as follows: Na2 CO 3 =Na 2 O+CO 2 CaCO 3 =CaO+CO 2 ; S3. The preheated and decomposed materials fall into a high-temperature glass-making kiln to complete high-temperature calcination. The fuel used for high-temperature calcination is coal gas, and the combustion-supporting gas is full oxygen. The main reactions are as follows: Na 2 CO 3 +SiO 2 =Na 2 SiO 3 +CO 2 CaCO 3 +SiO 2 =CaSiO 3 +CO 2 Na 2 O+SiO 2 =Na 2 SiO 3 CaO+SiO 2 =CaSiO 3 ; S4, after the materials are calcined in the high-temperature glass-making kiln, they enter the glass manufacturing production line for molding and processing into glass products; S5. The flue gas after high-temperature calcination enters the first-level waste heat boiler system to recover heat after the first-level denitrification for power generation; the flue gas after waste heat recovery enters the preheating decomposition high-efficiency rotary kiln at a temperature of 1050℃, and then the flue gas recovers heat through the second-level waste heat boiler. The recovered heat is preferentially used for power generation and energy storage for self-use; the flue gas after the second-level waste heat boiler is discharged from the chimney after desulfurization, second-level denitrification and dust removal.

[0018] In summary, the present invention solves the problem of constant switching of fuel gas and air for preheating and decomposition in the kiln in the original glass production process, and reduces the energy consumption of using waste heat from high-temperature kilns to heat gas and air. By using waste heat from high-temperature kilns to preheat and decompose materials in an independent rotary kiln, and cooperating with secondary waste heat boilers to recover heat, the utilization rate of thermal energy is improved; Secondly, the high temperature firing kiln of the present invention provides an important guarantee for the stable improvement of product quality by using an oxygen-enriched or full oxygen calcination process; Secondly, the present invention can greatly reduce nitrogen oxide emissions through high-temperature and medium-temperature secondary denitrification of flue gas.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A glass production process system with high efficiency, energy saving and emission reduction, characterized by: The following steps are involved: S1. Prepare a mixture with suitable particle size by mixing silica sand, soda ash, sodium sulfate, crude salt, dolomite and limestone according to the raw materials; S2, directly putting the mixed material into a high-efficiency rotary kiln for preheating and decomposition, wherein the heat for preheating and decomposition in the rotary kiln comes from the waste heat recovered from the high-temperature glass firing kiln, and the waste heat temperature is 650°C to 1050°C; S3, the preheated and decomposed material falls into a high-temperature glass-making kiln to complete high-temperature calcination, wherein the fuel used for the high-temperature calcination is coal gas, and the combustion-supporting gas is oxygen-enriched air or full oxygen; S4, after the materials are calcined in the high-temperature glass-making kiln, they enter the glass manufacturing production line for molding and processing into glass products; S5. The flue gas after high-temperature calcination enters the first-level waste heat boiler system to recover heat after the first-level denitrification. The flue gas after waste heat recovery enters the preheating decomposition high-efficiency rotary kiln at a temperature of 650℃~1050℃, and then the flue gas recovers heat through the second-level waste heat boiler. The flue gas after the second-level waste heat boiler is desulfurized, second-level denitrified and dust removed before being discharged from the chimney.

2. The glass production process system with high efficiency, energy saving and emission reduction according to claim 1, characterized in that: In S2, the mixed material is preheated in a preheating and decomposition high-efficiency rotary kiln and undergoes a decomposition reaction. The liquid phase containing sodium salt and halogen is wrapped by the siliceous component. The liquid phase is reduced by controlling the appropriate ratio to prevent coking and damage to the refractory material. The main reaction formula is as follows: Na2CO3=Na2O+CO2 CaCO3=CaO+CO2.

3. The glass production process system with high efficiency, energy saving and emission reduction according to claim 2, characterized in that: In S2, the preheating and decomposition high-efficiency rotary kiln is produced by a closed kiln.

4. The glass production process system with high efficiency, energy saving and emission reduction according to claim 1, characterized in that: In S3, the main reactions of the preheated and decomposed material in the high-temperature glass sintering furnace are as follows: Na2CO3+SiO2 =Na2SiO3+CO2 CaCO3+SiO2=CaSiO3+CO2 Na2O+SiO2 =Na2SiO3 CaO+SiO2=CaSiO3.

5. The glass production process system with high efficiency, energy saving and emission reduction according to claim 4, characterized in that: In S3, the oxygen content in the oxygen-enriched air is above 85%.

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