High-temperature kiln heating process for preparing black ash glass

Abstract

The application discloses a high-temperature kiln heating process for preparing black ash glass and relates to the technical field of glass production. The application comprises the steps of powder pretreatment, spiral dynamic melting, automatic unloading of a deposition pool and tail gas waste heat recovery. Glass powder flows along the blast air flow in a spiral preheating pipe, and heating flames are sprayed into the pipe wall in a tangential direction to form a vortex cover, so that efficient melting is realized; the molten liquid is automatically deposited at the bottom and falls into the main heating pool through a controllable blocking block mechanism at regular time, so that continuous liquid discharge to the float method pool is realized; exhaust gas is sealed after filtration in a recovery pool and drives a steam turbine to generate power by carrying steam. The process has the characteristics of flow type heating, efficient deposition control and energy recovery integration and is suitable for a continuous glass production line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass production, in particular to a high-temperature furnace heating process for preparing black ash glass. BACKGROUND

[0002] The existing glass melting process mainly relies on large pool furnace structure, and the block or granular glass raw materials are heated as a whole into the melting pool. The outstanding problems of this method are: the heating method is mostly one-way radiation or bottom heating, the heat transfer path is long, the contact area of powder with flame or heat source is limited, which leads to low heating efficiency and uneven heating, and part of the raw materials is always in a semi-molten state, which requires longer heating time to melt all the glass. SUMMARY

[0003] In order to overcome the defects of the prior art, the present application provides the following technical scheme: a high-temperature furnace heating process for preparing black ash glass, comprising the following steps: S1, using a glass screening machine to remove impurities and purify waste glass; S2, grinding the waste glass and / or glass raw materials into powder with a diameter of 0.5-1.5mm; S3, vacuum drying the powder in step S2 to remove residual moisture; S4, conveying the dried glass powder into a furnace assembly for heating and melting; the furnace assembly comprises a spiral preheating pipe, two rows of flame nozzle mounting pipes are symmetrically arranged in the middle section of the spiral preheating pipe, each flame nozzle mounting pipe is arranged along the tangent direction of the spiral preheating pipe, and the rotational directions of all the flame nozzle mounting pipes from the outside to the inside of the spiral preheating pipe are consistent (clockwise or counterclockwise; depending on the rotational direction of the spiral preheating pipe; that is, by feeding air into the spiral preheating pipe through all the flame nozzle mounting pipes, the gas inside the spiral preheating pipe will flow in the same direction); each flame nozzle mounting pipe is provided with a gas nozzle; S5, the melted glass is introduced into the subsequent float bath to form a flat continuous glass ribbon.

[0004] Preferably, the bottom of each pitch of the spiral preheating pipe is fixedly connected with a deposition tank, each deposition tank is slidably sealed with a blocking block, and the blocking block is flush with the inner wall of the spiral preheating pipe; all the deposition tanks are fixedly connected with a main heating tank, the bottom surface of the main heating tank is inclined, and the low end of the inclined bottom surface of the main heating tank is provided with a drainage port communicating with the inside of the main heating tank.

[0005] Preferably, the spiral preheating pipe comprises an air inlet end and an air outlet end, wherein the air outlet end is fixedly communicated with an air outlet pipeline, the bottom end of the air outlet pipeline extends to the inside of the filtering recovery tank, water is arranged in the inside of the filtering recovery tank, and the bottom end of the air outlet pipeline is below the water surface in the inside of the filtering recovery tank. The distance between the bottom end of the air outlet pipeline and the water surface in the filtering recovery tank is 20-25 cm. The bottom of the filtering recovery tank can be provided with a spiral blowdown pipe, and a spiral rod is arranged in the pipeline for periodically removing the glass particles deposited in the filtering recovery tank.

[0006] Preferably, the upper surface of the filtering recovery tank is fixedly communicated with a waste heat recovery pipe away from the air outlet pipeline, and a steam wheel is rotatably arranged in the waste heat recovery pipe, and the rotating shaft of the steam wheel is in transmission connection with the input shaft of the generator assembly.

[0007] Preferably, the spiral preheating pipe and the main heating tank are fixedly installed on the base frame through the rack, the frame-type base is fixedly arranged at the position below the main heating tank, four parallel vertical sliding rods are fixedly installed on the frame-type base, a support column mounting seat is slidingly installed on the four vertical sliding rods through a support beam frame, the same number of linkage rods as the blocking blocks are fixedly installed on the support column mounting seat, and all the linkage rods are fixedly matched with the main heating tank and the blocking blocks. The linkage rods and the main heating tank are in sliding sealing cooperation.

[0008] Preferably, a tension spring is sleeved around each vertical sliding rod, and the two ends of the tension spring are fixedly matched with the support beam frame and the frame-type base. A support column is in contact and lapping between the support beam frame and the frame-type base, and the support column is used for supporting the support beam frame.

[0009] Preferably, the filtering recovery tank is fixedly installed on the base frame, the outer side of the spiral preheating pipe is sleeved with a heat preservation cover, the heat preservation cover is fixedly arranged on the base frame, and a sliding chute is fixedly and obliquely arranged on the base frame below the liquid outlet.

[0010] Preferably, a blower is also fixedly installed on the base frame, an air outlet of the blower is fixedly communicated with a blast pipeline, the blast pipeline is fixedly and communicatively arranged with the air inlet end of the spiral preheating pipe through a mixed air pipe. The middle part of the mixed air pipe is fixedly communicated with an inclined material inlet pipe, one end of the material inlet pipe away from the mixed air pipe is fixedly communicated with a material hopper. The material inlet pipe is fixedly installed on a trapezoidal frame, and the trapezoidal frame is fixedly arranged on the base frame.

[0011] Compared with the prior art, the present application has the following beneficial effects: (1) the present application realizes vortex type covering heating of high-temperature flame and airflow by tangential gas injection inside the spiral preheating pipe, so that the glass powder can be melted during the flowing process. The powder continuously tumbles under the pushing of the rotating airflow, the heating surface area is multiplied, and the heat utilization efficiency per unit energy is much higher than that of the pool furnace type heating; (2) the present application introduces a filtering recovery tank at the exhaust end, recovers the un-melted glass particles in the gas by using a water seal structure, and simultaneously converts the high-temperature tail gas into steam to drive a steam turbine to generate electricity, realizing dust removal + cooling + energy recovery, and greatly reducing the operation energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0013] Figure 2 It is a schematic diagram of the structure of the inlet pipe of the present application.

[0014] Figure 3 It is a schematic diagram of the structure of the filtering recovery tank of the present application.

[0015] Figure 4 It is a schematic diagram of the installation position of the support column of the present application.

[0016] Figure 5 It is a schematic diagram of the installation position structure of the flame nozzle mounting pipe of the present application.

[0017] Figure 6 It is a schematic diagram of the main heating tank structure of the present application.

[0018] Figure 7 It is a stepped sectional view of the spiral preheating pipe of the present application.

[0019] In the figure: 101-spiral preheating pipe; 102-flame nozzle mounting pipe; 103-plug; 104-deposition tank; 105-main heating tank; 106-linkage rod column; 107-support column mounting seat; 108-support beam frame; 109-drainage port; 110-air inlet end; 111-air outlet end; 112-vertical sliding rod; 113-tension spring; 114-frame base; 115-support column; 116-exhaust pipe; 117-filtering recovery tank; 118-waste heat recovery pipe; 119-steam turbine; 120-blower; 121-blower pipe; 122-mixed air pipe; 123-inlet pipe; 124-inlet hopper; 125-sliding chute; 126-heat preservation and insulation cover; 127-base frame; 128-ladder frame. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be further described below in combination with the accompanying drawings. Figures 1-7 , and the technical solutions of the present application will be further described below in combination with the accompanying drawings.

[0021] The application provides a high-temperature kiln heating process for preparing black ash glass, which comprises the following steps: S1, using a glass screening machine to remove impurities and purify waste glass; S2, grinding the waste glass and / or glass raw materials into powder with a diameter of 0.5-1.5 mm; S3, vacuum drying the powder in step S2 to remove residual moisture; S4, conveying the dried glass powder into a kiln assembly for heating and melting; the kiln assembly comprises a spiral preheating pipe 101, two rows of flame nozzle mounting pipes 102 are symmetrically arranged in the middle section of the spiral preheating pipe 101, each flame nozzle mounting pipe 102 is arranged along the tangent direction of the spiral preheating pipe 101, and the rotational directions of all the flame nozzle mounting pipes 102 from the outside to the inside of the spiral preheating pipe 101 are consistent (clockwise or counterclockwise; depending on the rotational direction of the spiral preheating pipe 101; that is, by feeding air into the spiral preheating pipe 101 through all the flame nozzle mounting pipes 102, the gas inside the spiral preheating pipe 101 will flow in the same direction); a gas nozzle is mounted in each flame nozzle mounting pipe 102; S5, the melted glass is introduced into a subsequent float bath to form a flat continuous glass ribbon.

[0022] The bottom of each pitch of the spiral preheating pipe 101 is fixedly connected with a deposition tank 104, a blocking block 103 is slidably sealed in each deposition tank 104, and the blocking block 103 is flush with the inner wall of the spiral preheating pipe 101; all the deposition tanks 104 are fixedly connected with a main heating tank 105, the bottom surface of the main heating tank 105 is inclined, and a drainage port 109 is arranged at the low end position of the inclined bottom surface of the main heating tank 105 and is in communication with the inside of the main heating tank 105. The spiral preheating pipe 101 comprises an air inlet end 110 and an air outlet end 111, wherein the air outlet end 111 is fixedly connected with an exhaust pipe 116, the bottom end of the exhaust pipe 116 extends into the inside of a filtration recovery tank 117, water is arranged in the inside of the filtration recovery tank 117, and the bottom end of the exhaust pipe 116 is below the water surface in the inside of the filtration recovery tank 117. The distance between the bottom end of the exhaust pipe 116 and the water surface in the filtration recovery tank 117 is 20-25 cm. A spiral drain pipe can be arranged at the bottom of the filtration recovery tank 117, a spiral rod is arranged in the pipe for regularly removing the deposited glass particles in the filtration recovery tank 117. A waste heat recovery pipe 118 is fixedly connected with the upper surface of the filtration recovery tank 117 away from the exhaust pipe 116, a steam wheel 119 is rotatably arranged in the waste heat recovery pipe 118, and the rotating shaft of the steam wheel 119 is in transmission connection with an input shaft of a generator assembly.

[0023] The spiral preheating pipe 101 and the main heating pool 105 are fixedly installed on the base frame 127 through the rack overhead, the base frame 127 is fixedly arranged below the main heating pool 105, the frame-shaped base 114 is fixedly arranged on the base frame 127, four parallel arranged vertical sliding rods 112 are fixedly installed on the frame-shaped base 114, the support column mounting seat 107 is slidingly installed on the four vertical sliding rods 112 through the support beam frame 108, the same number of linkage rods 106 as the block plug 103 are fixedly installed on the support column mounting seat 107, and all the linkage rods 106 are fixedly matched with the main heating pool 105 and the block plug 103. The linkage rods 106 are slidingly and sealingly matched with the main heating pool 105. The pull spring 113 is sleeved around each vertical sliding rod 112, the two ends of the pull spring 113 are fixedly matched with the support beam frame 108 and the frame-shaped base 114, the support column 115 is in contact and lapped between the support beam frame 108 and the frame-shaped base 114, and the support column 115 is used for supporting the support beam frame 108. The filtering and recycling pool 117 is fixedly installed on the base frame 127, the outer side of the spiral preheating pipe 101 is sleeved with the heat preservation cover 126, the heat preservation cover 126 is fixedly arranged on the base frame 127, the base frame 127 is fixedly and obliquely arranged below the liquid outlet 109 and is provided with the sliding material groove 125. The base frame 127 is also fixedly provided with the air blower 120, the exhaust port of the air blower 120 is fixedly and communicatively provided with the air blowing pipeline 121, the air blowing pipeline 121 is fixedly and communicatively provided with the mixed air pipe 122 at the gas inlet end 110 of the spiral preheating pipe 101; the mixed air pipe 122 is fixedly and communicatively provided with the inclined material inlet pipe 123 at the middle portion, the material inlet pipe 123 is fixedly and communicatively provided with the material hopper 124 at the end away from the mixed air pipe 122; the material inlet pipe 123 is fixedly installed on the trapezoidal frame 128, and the trapezoidal frame 128 is fixedly arranged on the base frame 127.

[0024] The working principle is as follows: the glass screening machine is used to remove impurities from waste glass; the waste glass and / or glass raw materials are ground into powder with a diameter of 0.5-1.5 mm; the powder is vacuum dried to remove residual moisture; the dried glass powder is transported to the kiln assembly for heating and melting; the kiln assembly includes a spiral preheating pipe 101, two rows of flame nozzle mounting pipes 102 are symmetrically arranged in the middle of the spiral preheating pipe 101, each flame nozzle mounting pipe 102 is arranged along the tangent direction of the spiral preheating pipe 101, and the rotational directions of all the flame nozzle mounting pipes 102 from the outside to the inside of the spiral preheating pipe 101 are consistent (clockwise or counterclockwise; depending on the rotational direction of the spiral preheating pipe 101); each flame nozzle mounting pipe 102 is internally provided with a gas nozzle; the melted glass is introduced into the subsequent float bath to form a flat and continuous glass ribbon.

[0025] Glass powder is poured into the hopper 124 in batches, before which the gas pipeline is connected with all the flame nozzle mounting pipes 102 (including oxygen), at this time the inside of the spiral preheating pipe 101 has gas, the gas inside the spiral preheating pipe 101 at each flame nozzle mounting pipe 102 is ignited, the flame nozzle mounting pipe 102 at one end inside the spiral preheating pipe 101 will spray fire, play a heating role (the ignition process, the fire is thrown from the hopper 124, the air blower 120 is started, the air blower 120 injects airflow into the spiral preheating pipe 101 through the air blowing pipe 121 and the mixed air pipe 122, at this time the fire will be ignited under the action of the airflow. The alcohol is selected as the fire, poured into the spiral preheating pipe 101, so that the spiral preheating pipe 101 and the inner wall of the feeding pipe 123 are all coated with alcohol, the alcohol is ignited with a flame, the flame will move along the path of the alcohol adhered to the inner wall of the spiral preheating pipe 101 and the feeding pipe 123, thereby igniting the gas inside the spiral preheating pipe 101; or directly use a match, the match will be moved by the airflow to contact the gas inside the spiral preheating pipe 101, and then be ignited, the remaining match will be ejected from the 101 under the action of the airflow, it should be noted that at this time the melting work of the glass powder has not formally started, only the ignition step, so the glass powder will not be contaminated). By default, the blocking block 103 is located at the topmost position.

[0026] Glass powder entering the hopper 124 will be guided into the mixing air pipe 122 through the inlet pipe 123, and then flow into the spiral preheating pipe 101 under the action of the air flow supplied by the air blower 120, and follow the air flow in the spiral preheating pipe 101. During this process, the glass powder will be heated by the flame. When the glass powder is melted, the believed glass melt will adhere together, so that the overall weight increases and the viscosity also increases. At this time, it will be deposited (under the combined action of gravity and centrifugal force) at the bottom of the spiral preheating pipe 101 (that is, the position of the blocking block 103). With the passage of time, a layer of glass melt will be deposited at the bottom of the spiral preheating pipe 101, and the subsequent melted glass will adhere to the glass melt, or part of the glass powder will adhere to the glass melt (the glass powder that does not adhere will follow the gas to the exhaust end 111 and continue to be heated and melted, and the glass powder adhered to the glass melt will be heated and melted into the glass melt). The main heating pool 105 is also provided with a heating unit (using heating wire or flame, which needs to be heated separately from the glass melt), and the drain port 109 is provided with a valve body for adjusting the flow rate of the glass melt (which can be used to control the liquid level position of the glass melt in the main heating pool 105, the deposition pool 104, and the spiral preheating pipe 101). After the glass powder in the spiral preheating pipe 101 is heated for a certain period of time (that is, a layer of glass melt is deposited in the spiral preheating pipe 101), and the main heating pool 105 is preheated, the drain port 109 is blocked, the user uses the rope previously tied on the support column 115, and two people pull it outwards, so that the support column 115 is separated from the support beam frame 108 and the frame-shaped base 114. Under the action of the tension spring 113, the support beam frame 108 will move downward (when resetting, use the jack to lift the support beam frame 108 from the frame-shaped base 114, and then put the support column 115 back; only when starting and stopping do you need to reset, and normally you don't). The support beam frame 108 drives the support column mounting seat 107 to move, the support column mounting seat 107 drives all the connecting rod columns 106 to move, the connecting rod columns 106 drive the blocking block 103 to move, so that the blocking block 103 no longer blocks the deposition pool 104. At this time, the glass melt in the spiral preheating pipe 101 will fall into the main heating pool 105, and then accumulate in the main heating pool 105, until the liquid level height of the glass melt in the main heating pool 105 and the deposition pool 104 reenters the bottom of the spiral preheating pipe 101, then open the drain port 109, and control the opening degree of the drain port 109 to ensure that the flow rate of the glass melt and the deposition rate of the glass melt in the spiral preheating pipe 101 are consistent. The glass melt flowing out of the drain port 109 will slide down to the float bath through the sliding chute 125.At the same time, the glass powder that follows the gas flow in the spiral preheating tube 101 can be mixed with un-melted glass particles (so a longer spiral preheating tube 101 is provided to fully melt), if there are still solid glass particles, they will enter the exhaust duct 116 through the exhaust end 111, and then enter the water in the filter recovery tank 117, this part of water will filter the glass particles in the gas, and this part is high-temperature gas, the gas will also heat the water in the filter recovery tank 117, the water vapor will drive the steam turbine 119 in the waste heat recovery pipe 118 to rotate, the steam turbine 119 drives the generator set to generate electricity, thereby recovering the waste heat energy. At the same time, new water needs to be continuously supplemented into the filter recovery tank 117 (the steam sprayed at the waste heat recovery pipe 118 can be condensed and then returned to the filter recovery tank 117).

Claims

1. A high-temperature furnace heating process for preparing black-gray glass, characterized in that, Includes the following steps: S1. Use a glass screening machine to remove impurities and purify waste glass; S2. Grind waste glass and / or glass raw materials into powder with a diameter of 0.5-1.5mm; S3. Vacuum dry the powder from step S2 to remove residual moisture; S4. The dried glass powder is conveyed to the furnace assembly for heating and melting; the furnace assembly includes a spiral preheating tube (101), and two rows of flame nozzle mounting tubes (102) are symmetrically arranged in the spiral middle section of the spiral preheating tube (101). Each flame nozzle mounting tube (102) is arranged along the tangent direction of the spiral preheating tube (101), and a gas nozzle is installed inside each flame nozzle mounting tube (102); the spiral preheating tube (101) includes an inlet end (110) and an exhaust end (111), wherein the exhaust end (111) is fixed. An exhaust pipe (116) is connected to the filter recovery tank (117), the bottom end of which extends into the interior of the filter recovery tank (117), which is filled with water, and the bottom end of the exhaust pipe (116) is located below the water surface inside the filter recovery tank (117); a waste heat recovery pipe (118) is fixedly connected to the upper surface of the filter recovery tank (117) away from the exhaust pipe (116), and a steam turbine (119) is rotatably installed inside the waste heat recovery pipe (118), and the shaft of the steam turbine (119) is connected to the input shaft of the generator assembly for transmission. S5. The molten glass is diverted to the subsequent float glass tank to form a flat, continuous glass strip.

2. The high-temperature furnace heating process for preparing black and gray glass according to claim 1, characterized in that: Each section of the spiral preheating tube (101) has a fixedly connected sedimentation tank (104) at its bottom. Each sedimentation tank (104) has a slidingly sealed blocking block (103) installed inside. The blocking block (103) is flush with the inner wall of the spiral preheating tube (101). All sedimentation tanks (104) are fixedly connected to the main heating tank (105). The bottom surface of the main heating tank (105) is inclined, and the lower end of the inclined bottom surface of the main heating tank (105) is equipped with a drain port (109) that communicates with the inside of the main heating tank (105).

3. The high-temperature furnace heating process for preparing black and gray glass according to claim 2, characterized in that: The spiral preheating tube (101) and the main heating pool (105) are fixedly mounted on the base frame (127) via the frame. The base frame (127) is fixed with a frame base (114) below the main heating pool (105). Four parallel vertical sliding rods (112) are fixedly installed on the frame base (114). Support column mounting seats (107) are slidably installed on the four vertical sliding rods (112) via the support beam frame (108). The same number of linkage rods (106) as the blockage block (103) are fixedly installed on the support column mounting seats (107). All linkage rods (106) pass through the main heating pool (105) and are fixedly engaged with the blockage block (103).

4. The high-temperature furnace heating process for preparing black and gray glass according to claim 3, characterized in that: Each vertical sliding rod (112) is surrounded by a tension spring (113), and the two ends of the tension spring (113) are fixedly engaged with the support beam frame (108) and the frame base (114). A support column (115) is connected between the support beam frame (108) and the frame base (114), and the support column (115) is used to support the support beam frame (108).

5. The high-temperature furnace heating process for preparing black and gray glass according to claim 4, characterized in that: The filter recovery tank (117) is fixedly installed on the base frame (127). The outer side of the spiral preheating tube (101) is covered with a heat insulation cover (126). The heat insulation cover (126) is fixed on the base frame (127). The base frame (127) is located below the drain port (109) and is fixedly installed with a sliding material chute (125).

6. The high-temperature furnace heating process for preparing black and gray glass according to claim 5, characterized in that: A blower (120) is also fixedly installed on the base frame (127). The exhaust port of the blower (120) is fixedly connected to the blower pipe (121). The blower pipe (121) is fixedly connected to the air inlet (110) on the spiral preheating pipe (101) through the mixing pipe (122). The middle part of the mixing pipe (122) is fixedly connected to the inclined feed pipe (123). The end of the feed pipe (123) away from the mixing pipe (122) is fixedly connected to the feed hopper (124). The feed pipe (123) is fixedly installed on the trapezoidal frame (128), and the trapezoidal frame (128) is fixed on the base frame (127).

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