A glaze preparation, automatic glazing system and process for coke oven door prefabricated blocks

Abstract

The invention relates to a glaze preparation and automatic glazing system and process for a coke oven door prefabricated block. The system comprises a ball mill, a glaze powder collector, a stirrer, a glaze storage tank, a glazing cabinet, a water-gas separator, a filtering device, a first fan and a second fan. The invention realizes automatic control of the entire glazing process by reasonably designing the glazing production process and replacing the existing manual operation, thereby improving production efficiency and product quality. The production process is a fully enclosed operation, thereby realizing closed-loop use of materials, pollution-free external discharge, protecting the environment, and saving resources.

Description

Technical Field

[0001] The invention relates to the technical field of glaze preparation and glazing, and in particular to a glaze preparation, automatic glazing system and process for a coke oven door prefabricated block. Background Art

[0002] At present, the prefabricated blocks of coke oven doors used in my country are mostly made of mullite and cordierite as the main raw materials, that is, mullite-cordierite is used as the basic material of the prefabricated blocks of coke oven doors, silica fume and alumina are added as the matrix part, and aluminate cement is used as the binder. After mixing and vibration molding, the prefabricated blocks with a length of 630-1060mm, a width of 580-630mm, and a height of 400-500mm are made. After curing, drying at 450-600℃, and sintering at 1250-1350℃, the finished products are made. Mullite-cordierite prefabricated blocks have high compressive strength (≥45MPa), good thermal shock stability (1100℃-water cooling ≥50 times) and low thermal conductivity (1000℃, ≤1.2W / MK), which can adapt to the harsh production conditions of coke oven doors (25-1000℃).

[0003] However, during the coke oven production process, the coking products such as tar adhere to the surface of the prefabricated blocks of the coke oven door. As the use time increases, the carbon deposit layer gradually thickens, which can easily lead to air leakage and fire due to the door not being closed tightly. In addition, harmful substances such as carbon can easily penetrate into the prefabricated parts, reducing the physical properties of the prefabricated parts. At the same time, the cleaning of the carbon deposit layer will also damage the prefabricated blocks of the furnace door. The production cost of the prefabricated blocks of the furnace door is high, and it is difficult to replace them after local damage. Therefore, in addition to having good wear resistance, thermal shock resistance and high temperature stability, the prefabricated blocks of the coke oven door also need to have chemical corrosion resistance and carbon resistance.

[0004] The main method to improve the chemical erosion resistance and carbonization resistance of the coke oven door prefabricated block is to apply glaze on the working surface of the prefabricated block, and the glaze thickness should be ≥1mm. The main raw materials of the glaze are feldspar, spodumene, fused quartz powder, alumina powder, and zinc oxide, which can form a glaze surface after melting at a firing temperature of 1300℃. The smooth glaze surface improves the chemical erosion resistance and carbonization resistance of the coke oven door prefabricated block, avoids the formation of carbon deposition layer, prolongs the service life of the furnace door, reduces the labor intensity of workers cleaning the furnace door, and achieves the purpose of increasing production, saving consumption, and improving environmental protection efficiency.

[0005] At present, refractory material factories mostly use manual production methods in the processes of glaze preparation and glazing. The production environment is poor, full of dust and gasified glaze slurry, which seriously affects the health of workers and cannot guarantee the quality of glazing. The poor environment makes it difficult to recruit workers in the industry, and the labor cost increases, which brings a burden to the operating costs of enterprises.

[0006] A Chinese patent with application number 201710398266.X (application date May 31, 2017) discloses a "high-temperature ceramic glaze for large-scale cast and sintered furnace door bricks and its preparation method", which mentions a preparation method for high-temperature ceramic glaze for furnace door bricks. However, the batching, ball milling, glazing and other processes require a lot of manual operation and fail to reflect intelligent manufacturing. During the glazing process, glaze slurry overflow and uneven glazing will occur, causing environmental pollution and unqualified glaze quality.

[0007] The Chinese patent application number 201510767867.4 (application date November 11, 2015) discloses "an automatic glazing device", which only involves a glazing device, and there are no environmentally friendly recycling measures during the glazing process, causing environmental pollution and waste of resources. Summary of the invention

[0008] The present invention provides a glaze preparation and automatic glazing system and process for coke oven door prefabricated blocks. By reasonably designing the glazing and glazing production processes, automatic control of the entire glazing and glazing process is achieved, replacing existing manual operations and improving production efficiency and product quality. The production process is a fully enclosed operation, achieving closed-loop use of materials, no pollution discharge, protecting the environment, and saving resources.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A glaze preparation and automatic glazing system for prefabricated blocks of coke oven doors, comprising a ball mill, a glaze powder collector, a mixer, a glaze storage tank, a glazing cabinet, a water-gas separator, a filtering device, a first fan and a second fan; a weighing feeder is arranged at the inlet of the ball mill, the outlet of the ball mill is connected to the inlet of the glaze powder collector through a pneumatic feeding pipeline, the outlet of the glaze powder collector is connected to the inlet of a glaze hopper and a hopper scale in turn, the outlet of the hopper scale is connected to the glaze powder inlet of the mixer, the mixer is also provided with a water inlet, the water inlet is connected to a water inlet pipeline, and a liquid metering device is arranged on the water inlet pipeline; the outlet of the mixer is connected to the inlet of the glaze storage tank, the outlet of the glaze storage tank is connected to a plurality of spray guns arranged in the glazing cabinet through a glaze slurry conveying pipeline; the two ends of the glazing cabinet are respectively provided with a prefabricated block inlet and a prefabricated block outlet, and the prefabricated An inlet sealing valve and an inlet conveying chain are arranged at the inlet of the block, and an outlet sealing valve and an outlet conveying chain are arranged at the outlet of the prefabricated block; a glaze turntable is arranged in the glazing cabinet, spray guns are arranged above the glazing turntable and on the glazing cabinets on both sides, and a tray collector is arranged below the glazing turntable; an exhaust gas outlet is arranged on the top of the glazing cabinet and is connected to the water-gas separator, and the gas phase outlet of the water-gas separator is connected to the filtering device, the fan 1 and the wind power feeding pipeline in sequence through the exhaust gas pipeline; the liquid phase outlet of the water-gas separator and the waste liquid outlet of the tray collector are connected to the glaze storage tank through the glaze slurry recovery pipeline; a dust gas outlet is arranged on one side of the upper part of the mixer and one side of the hopper scale, which is connected to the feed port on the glaze powder collector through the dust gas collection pipeline; a circulating air outlet is also arranged on the glaze powder collector, which is connected to the feed port of the ball mill through the circulating air pipeline, and the fan 2 is arranged on the circulating air pipeline.

[0011] An iron remover is provided at the discharge port of the ball mill.

[0012] The mixer is a sealed mixer, and the glaze storage tank is a stainless steel storage tank with a built-in stirrer. There are two glaze storage tanks, which serve as backup for each other.

[0013] A system for preparing glaze for a coke oven door prefabricated block and automatically glazing the door also includes a glazing control system; the switch valve of the spray gun and the driving device of the glazing turntable are respectively connected to the glazing control system.

[0014] The tray collector is made of stainless steel and is tilted with a slope of 3% to 5% relative to the horizontal plane.

[0015] The filtering device is provided with a honeycomb activated carbon adsorption material.

[0016] The glaze hopper is a steel hopper with a ceramic wear-resistant lining plate on the inner surface.

[0017] The glaze preparation and automatic glazing process for the prefabricated block of the coke oven door based on the system includes the following steps:

[0018] (1) The glaze raw materials with a particle size of less than 3 mm are weighed by a weighing feeder and then enter a ball mill to obtain a glaze powder with a particle size of 100 mesh. The glaze powder is deironed by a deironing device and then sent to a glaze powder collector by fresh air from a blower. The collected glaze powder is stored in a glaze hopper;

[0019] (2) The glaze powder in the glaze hopper is weighed by the hopper scale and then enters the mixer. At the same time, water measured by the liquid metering device is added to the mixer according to 40% to 50% of the weight of the glaze, and stirred to form a glaze slurry; the glaze powder dust in the hopper scale and the mixer is sent to the glaze powder collector through the circulating air of the fan 2 for collection and utilization;

[0020] (3) The glaze slurry flows into the glaze storage tank through the pipeline, and is stirred by the agitator in the glaze storage tank for 12 to 24 hours. After the glaze slurry is homogenized and aged, it is transported to the spray gun through the glaze slurry transport pipeline;

[0021] (4) The coke oven door prefabricated block is delivered to the prefabricated block entrance of the glazing cabinet through the inlet conveyor chain, the inlet sealing valve on the glazing cabinet is opened, and the outlet sealing valve is closed. The inlet conveyor chain delivers the coke oven door prefabricated block to the glazing turntable in the glazing cabinet. After the inlet conveyor chain exits, the inlet sealing valve is closed to form a closed glazing environment;

[0022] (5) According to the glazing thickness, the glazing control system automatically sets the glazing flow rate, glazing time and rotation speed of the glazing turntable of the spray gun; the glazing turntable rotates at a constant speed, and glazing is applied through the spray gun;

[0023] (6) After the glazing is completed, the outlet sealing valve is opened, and the outlet conveyor chain takes out the glazed coke oven door prefabricated block. The coke oven door prefabricated block is naturally dried for 6 to 12 hours and then fired at high temperature to become a prefabricated block finished product;

[0024] (7) The waste gas in the glazing cabinet is treated by a water-gas separator, and the harmful substances in the gas phase are adsorbed and filtered by a filter device and then returned to the fresh air for the glaze powder, and the liquid glaze slurry is recovered into the glaze storage tank;

[0025] (8) The waste glaze slurry in the glazing cabinet is collected by a tray collector and then returned to the glaze storage tank.

[0026] The invention discloses a glaze preparation and automatic glazing process for a coke oven door prefabricated block, wherein the whole production process adopts a fully closed cycle operation.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The glaze is finely ground to 100 mesh, the glaze slurry is mixed more evenly, and the melting temperature required for high-temperature firing of the glaze is reduced, which can effectively reduce energy consumption;

[0029] (2) During the glaze preparation process, the glaze powder is transported by air. The ball mill, glaze powder collector, fan, hopper scale, mixer and other equipment are connected to the wind conveying pipeline through a chute or pipeline, and there is no dust leakage; the dust in the hopper scale and mixer is returned to the glaze powder collector for recycling;

[0030] (3) The glazing cabinet is a closed structure, and there is no glaze slurry overflow during the glazing process; the glaze slurry and glaze slurry waste liquid are transported and recycled through pipelines, which is safe and hygienic; the exhaust gas is filtered to absorb harmful substances and then returned to the wind power transmission pipeline as fresh air, without any irritating odor overflowing;

[0031] (4) During the glazing process, the glazing turntable rotates at a constant speed, the machine automatically forms, the glaze surface of the prefabricated block is more uniform, smooth and flat, the glaze cracks are small, the number of glaze bubbles is small, the scrap rate is low, and the service life is long;

[0032] (5) The glazing time can be automatically adjusted through the glazing control system to achieve the required glazing thickness of the prefabricated block.

[0033] (6) The entire production process adopts a fully closed circulation method, using fresh air and circulating air delivery. The system is well sealed, with less dust leakage and waste during the production process, no pollution discharge, environmental protection, and resource conservation;

[0034] (7) The entire production process has a high degree of automation, which can effectively improve production efficiency, improve product quality, reduce manual jobs with poor environment and high workload, and reduce the burden on enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The invention discloses a structural schematic diagram of a glaze preparation and automatic glazing system for a coke oven door prefabricated block.

[0036] Figure 2 The invention discloses a schematic flow chart of a glaze preparation and automatic glazing process for a coke oven door prefabricated block.

[0037] In the figure: 1. Weighing feeder 2. Ball mill 3. Iron remover 4. Glaze powder collector 5. Fan 2 6. Glaze hopper 7. Hopper scale 8. Liquid metering device 9. Mixer 10. Glaze storage tank 11. Inlet conveyor chain 12. Inlet sealing valve 13. Glazing cabinet 14. Spray gun 15. Glazing turntable 16. Outlet sealing valve 17. Outlet conveyor chain 18. Tray collector 19. Water-gas separator 20. Filter device 21. Fan 1 DETAILED DESCRIPTION

[0038] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0039] like Figure 1As shown, the present invention discloses a glaze preparation and automatic glazing system for a prefabricated block of a coke oven door, comprising a ball mill 2, a glaze powder collector 4, a mixer 9, a glaze storage tank 10, a glazing cabinet 13, a water-gas separator 19, a filter device 20, a fan 1 21 and a fan 2 5; a weighing feeder 1 is arranged at the inlet of the ball mill 2, the outlet of the ball mill 2 is connected to the inlet of the glaze powder collector 4 through a pneumatic feeding pipeline, and the outlet of the glaze powder collector 4 is connected to the glaze material feeding port in turn. The feed inlet of the hopper 6 and the hopper scale 7, the discharge port of the hopper scale 7 is connected to the glaze powder inlet of the mixer 9, the mixer 9 is also provided with a water inlet, the water inlet is connected to the water inlet pipe, and the water inlet pipe is provided with a liquid metering device 8; the discharge port of the mixer 9 is connected to the feed inlet of the glaze storage tank 10, and the discharge port of the glaze storage tank 10 is connected to a plurality of spray guns 14 arranged in the glazing cabinet 13 through a glaze slurry conveying pipeline; the two ends of the glazing cabinet 13 are respectively provided with a prefabricated block inlet and a prefabricated block outlet, and the prefabricated An inlet sealing valve 12 and an inlet conveying chain 11 are arranged at the inlet of the block, and an outlet sealing valve 16 and an outlet conveying chain 17 are arranged at the outlet of the prefabricated block; a glaze turntable 15 is arranged in the glazing cabinet 13, and spray guns 14 are arranged on the glazing cabinet 13 above and on both sides of the glazing turntable 15, and a tray collector 18 is arranged below the glazing turntable 15; an exhaust gas outlet is arranged on the top of the glazing cabinet 13 and is connected to the water-gas separator 19, and the gas phase outlet of the water-gas separator 19 is connected to the filter device 20, the fan 21 and the wind power feeding pipeline in sequence through the exhaust gas pipeline; the liquid phase outlet of the water-gas separator 19 and the waste liquid outlet of the tray collector 18 are connected to the glaze storage tank 10 through the glaze slurry recovery pipeline; a dust gas outlet is arranged on one side of the upper part of the mixer 9 and one side of the hopper scale 7, and is connected to the feed port on the glaze powder collector 4 through the dust gas collection pipeline; a circulating air outlet is also arranged on the glaze powder collector 4, which is connected to the feed port of the ball mill 2 through the circulating air pipeline, and a fan 2 5 is arranged on the circulating air pipeline.

[0040] An iron remover 3 is provided at the discharge port of the ball mill 2 .

[0041] The mixer 9 is a sealed mixer, and the glaze storage tank 10 is a stainless steel storage tank with a built-in stirrer. There are two glaze storage tanks 10, which serve as backup for each other.

[0042] A system for preparing glaze for a coke oven door prefabricated block and automatically glazing the door also includes a glazing control system; the switch valve of the spray gun 14 and the driving device of the glazing turntable 15 are respectively connected to the glazing control system.

[0043] The tray collector 18 is made of stainless steel and is tilted with a slope of 3% to 5% relative to the horizontal plane.

[0044] The filtering device 20 is provided with a honeycomb activated carbon adsorption material.

[0045] The glaze hopper 6 is a steel hopper, and a ceramic wear-resistant lining is arranged on the inner surface.

[0046] like Figure 2 As shown, the glaze preparation and automatic glazing process for the prefabricated block of the coke oven door based on the system of the present invention includes the following steps:

[0047] (1) The glaze raw materials with a particle size of less than 3 mm are weighed by a weighing feeder 1 and then enter a ball mill 2 to obtain a glaze powder with a particle size of 100 mesh. The glaze powder is deironed by a deironing device 3 and then sent to a glaze powder collector 4 by fresh air from a fan 5. The collected glaze powder is stored in a glaze hopper 6;

[0048] (2) The glaze powder in the glaze hopper 6 is weighed by the hopper scale 7 and then enters the mixer 9. At the same time, water measured by the liquid metering device 8 is added to the mixer 9 according to 40% to 50% of the weight of the glaze, and stirred to form a glaze slurry; the glaze powder dust in the hopper scale 7 and the mixer 9 is sent to the glaze powder collector 4 for collection and utilization through the circulating air of the fan 2 5;

[0049] (3) The glaze slurry flows into the glaze storage tank 10 through the pipeline, and is stirred by the stirrer in the glaze storage tank 10 for 12 to 24 hours. After the glaze slurry is homogenized and aged, it is transported to the spray gun 14 through the glaze slurry transport pipeline;

[0050] (4) The coke oven door prefabricated block is delivered to the prefabricated block entrance of the glazing cabinet 13 through the inlet conveyor chain 11, the inlet sealing valve 12 on the glazing cabinet 13 is opened, and the outlet sealing valve 16 is closed. The inlet conveyor chain 11 delivers the coke oven door prefabricated block to the glazing turntable 15 in the glazing cabinet 13. After the inlet conveyor chain 11 exits, the inlet sealing valve 16 is closed to form a closed glazing environment;

[0051] (5) According to the glazing thickness, the glazing flow rate, glazing time and rotation speed of the glazing turntable 15 of the spray gun 14 are automatically set by the glazing control system; the glazing turntable 15 rotates at a constant speed to apply glaze through the spray gun 14;

[0052] (6) After the glazing is completed, the outlet sealing valve 16 is opened, and the outlet conveyor chain 17 takes out the glazed coke oven door prefabricated block. The coke oven door prefabricated block is naturally dried for 6 to 12 hours and then fired at high temperature to become a prefabricated block finished product;

[0053] (7) The exhaust gas in the glazing cabinet 13 is treated by the water-gas separator 19, and the harmful substances in the gas phase are adsorbed and filtered by the filter device 20 and then returned to the fresh air for the glaze powder, and the liquid glaze slurry is recovered into the glaze storage tank 10;

[0054] (8) The waste glaze slurry in the glazing cabinet 13 is collected by the tray collector 18 and then returned to the glaze storage tank 10.

[0055] The invention discloses a glaze preparation and automatic glazing process for a coke oven door prefabricated block, wherein the whole production process adopts a fully closed cycle operation.

[0056] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0057] [Example]

[0058] like Figure 1 As shown, in this embodiment, a glaze preparation and automatic glazing system for a prefabricated block of a coke oven door comprises a weighing feeder 1, a ball mill 2, an iron remover 3, a glaze powder collector 4, a second fan 5, a glaze hopper 6, a hopper scale 7, a liquid metering device 8, a mixer 9, a glaze storage tank 10, an inlet conveying chain 11, an inlet sealing valve 12, a glazing cabinet 13, a spray gun 14, a glazing turntable 15, an outlet sealing valve 16, an outlet conveying chain 17, a tray collector 18, a water-gas separator 19, a filter device 20, and a fan 21.

[0059] The feed port of the ball mill 2 is connected to the weighing feeder 1, the discharge port of the ball mill 2 is connected to the feed port of the iron remover 3, the discharge port of the iron remover 3, the glaze powder collector 4, the fan 2 5 and the fan 1 21 are connected through a wind conveying pipeline, the feed port of the glaze hopper 6 is connected to the glaze powder collector 4, the feed port of the hopper scale 7 is connected to the glaze hopper 6, the feed port of the mixer 9 is connected to the hopper scale 7 and the liquid metering device 8, the dust removal ports of the hopper scale 7 and the mixer 9 are connected to the glaze powder collector 4 through pipelines, the feed port of the glaze storage tank 10 is connected to the mixer 9, and the discharge port of the glaze storage tank 10 is connected to the spray gun 14 through a glaze slurry conveying pipeline.

[0060] The inlet conveying chain 11 is connected to the inlet sealing valve 12, and the inlet sealing valve 12 is arranged on the left side of the glazing cabinet 13 (in the direction shown in the figure). The spray gun 14 is arranged on the top and the front and rear sides of the glazing cabinet 13, and a total of three units are arranged; the glazing turntable 15 is arranged at the center of the glazing cabinet 13, and the outlet sealing valve 16 is arranged on the right side of the glazing cabinet 13 (in the direction shown in the figure). The outlet sealing valve 16 is connected to the outlet conveying chain 17, and the tray collector 18 is arranged at the lower part of the glazing cabinet 13. The glazing cabinet 13, the water-gas separator 19, the filter device 20 and the fan 21 are connected through pipelines.

[0061] like Figure 2 As shown, in this embodiment, a process for preparing glaze for a prefabricated block of a coke oven door and automatically glazing the prefabricated block comprises the following steps:

[0062] (1) The glaze raw materials with a particle size of less than 3 mm are weighed by a weighing feeder 1 and then enter a ball mill 2 to obtain a glaze powder with a particle size of 100 mesh. The glaze powder is deironed by a deironing device 3 and then sent to a glaze powder collector 4 by fresh air from a fan 5. The collected glaze powder is stored in a glaze hopper 6;

[0063] (2) The glaze powder in the glaze hopper 6 is weighed by the hopper scale 7 and then enters the mixer 9. At the same time, the water measured by the liquid metering device 8 is added to the mixer 9 according to 45% of the weight of the glaze, and stirred to form a glaze slurry; the glaze powder dust in the hopper scale 7 and the mixer 9 is sent to the glaze powder collector 4 for collection and utilization through the circulating air 5 of the fan 2;

[0064] (3) The glaze slurry flows into the glaze storage tank 10 through the pipeline, and is stirred for 20 hours by the stirrer in the glaze storage tank 10. After the glaze slurry is homogenized and aged, it is transported to the spray gun 14 through the glaze slurry transport pipeline;

[0065] (4) The coke oven door prefabricated block is delivered to the prefabricated block entrance of the glazing cabinet 13 through the inlet conveyor chain 11, the inlet sealing valve 12 on the glazing cabinet 13 is opened, and the outlet sealing valve 16 is closed. The inlet conveyor chain 11 delivers the coke oven door prefabricated block to the glazing turntable 15 in the glazing cabinet 13. After the inlet conveyor chain 11 exits, the inlet sealing valve 12 is closed to form a closed glazing environment;

[0066] (5) According to the glazing thickness, the glazing flow rate, glazing time and rotation speed of the glazing turntable 15 of the spray gun 14 are automatically set by the glazing control system; the glazing turntable 15 rotates at a constant speed to apply glaze through the spray gun 14;

[0067] (6) After the glazing is completed, the outlet sealing valve 16 is opened, and the outlet conveyor chain 17 takes out the glazed coke oven door prefabricated block. The coke oven door prefabricated block is naturally dried for 10 hours and then fired at high temperature to become a prefabricated finished product;

[0068] (7) The exhaust gas in the glazing cabinet 13 is treated by the water-gas separator 19, and the harmful substances in the gas phase are adsorbed and filtered by the filter device 20 and then returned to the fresh air for the glaze powder, and the liquid glaze slurry is recovered into the glaze storage tank 10;

[0069] (8) The waste glaze slurry in the glazing cabinet 13 is collected by the tray collector 18 and then returned to the glaze storage tank 10.

[0070] In this embodiment, all equipment is connected by chutes or pipelines, and operates in a closed cycle throughout the process, without dust leakage, and without generating waste materials, waste gas, and waste liquid, thus saving resources and protecting the environment.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for preparing glaze for coke oven door prefabricated blocks and automatically applying glaze, characterized in that: The invention comprises a ball mill, a glaze powder collector, a mixer, a glaze storage tank, a glazing cabinet, a water-gas separator, a filtering device, a first fan and a second fan; a weighing feeder is arranged at the inlet of the ball mill, the outlet of the ball mill is connected to the inlet of the glaze powder collector through a pneumatic feeding pipeline, the outlet of the glaze powder collector is connected to the inlet of the glaze hopper and the inlet of the hopper scale in turn, the outlet of the hopper scale is connected to the glaze powder inlet of the mixer, the mixer is also provided with a water inlet, the water inlet is connected to the water inlet pipeline, and a liquid metering device is arranged on the water inlet pipeline; the outlet of the mixer is connected to the inlet of the glaze storage tank, and the outlet of the glaze storage tank is connected to a plurality of spray guns arranged in the glazing cabinet through a glaze slurry conveying pipeline; a prefabricated block inlet and a prefabricated block outlet are arranged at both ends of the glazing cabinet, and an inlet sealing valve and An inlet conveyor chain is provided, and an outlet sealing valve and an outlet conveyor chain are provided at the outlet of the prefabricated block; a glaze turntable is provided in the glazing cabinet, spray guns are provided above the glazing turntable and on the glazing cabinets on both sides, and a tray collector is provided under the glazing turntable; an exhaust gas outlet is provided on the top of the glazing cabinet and is connected to the water-gas separator, and the gas phase outlet of the water-gas separator is connected to the filtering device, the fan 1 and the wind-powered feeding pipeline in sequence through the exhaust gas pipeline; the liquid phase outlet of the water-gas separator and the waste liquid outlet of the tray collector are connected to the glaze storage tank through the glaze slurry recovery pipeline; a dust gas outlet is provided on one side of the upper part of the mixer and one side of the hopper scale, which is connected to the feed port on the glaze powder collector through the dust gas collection pipeline; a circulating air outlet is also provided on the glaze powder collector, which is connected to the feed port of the ball mill through the circulating air pipeline, and the fan 2 is provided on the circulating air pipeline.

2. The system for preparing glaze and automatically applying glaze for prefabricated blocks of coke oven doors according to claim 1, characterized in that: An iron remover is provided at the discharge port of the ball mill.

3. The system for preparing glaze and automatically applying glaze for coke oven door prefabricated blocks according to claim 1, characterized in that: The mixer is a sealed mixer, and the glaze storage tank is a stainless steel storage tank with a built-in stirrer. There are two glaze storage tanks, which serve as backup for each other.

4. The system for preparing glaze and automatically applying glaze for prefabricated blocks of coke oven doors according to claim 1, characterized in that: It also includes a glazing control system; the switch valve of the spray gun and the driving device of the glazing turntable are respectively connected to the glazing control system.

5. The system for preparing glaze and automatically applying glaze for prefabricated blocks of coke oven doors according to claim 1, characterized in that: The tray collector is made of stainless steel and is tilted with a slope of 3% to 5% relative to the horizontal plane.

6. The system for preparing glaze and automatically applying glaze for prefabricated blocks of coke oven doors according to claim 1, characterized in that: The filtering device is provided with a honeycomb activated carbon adsorption material.

7. The system for preparing glaze and automatically applying glaze for prefabricated blocks of coke oven doors according to claim 1, characterized in that: The glaze hopper is a steel hopper with a ceramic wear-resistant lining plate on the inner surface.

8. A process for preparing glaze for prefabricated blocks of coke oven doors and for automatic glazing based on the system of any one of claims 1 to 7, characterized in that: The steps include: (1) The glaze raw materials with a particle size of less than 3 mm are weighed by a weighing feeder and then enter a ball mill to obtain a glaze powder with a particle size of 100 mesh. The glaze powder is deironed by a deironing device and then sent to a glaze powder collector by fresh air from a blower. The collected glaze powder is stored in a glaze hopper; (2) The glaze powder in the glaze hopper is weighed by the hopper scale and then enters the mixer. At the same time, water measured by the liquid metering device is added to the mixer according to 40% to 50% of the weight of the glaze, and stirred to form a glaze slurry; the glaze powder dust in the hopper scale and the mixer is sent to the glaze powder collector through the circulating air of the fan 2 for collection and utilization; (3) The glaze slurry flows into the glaze storage tank through the pipeline, and is stirred by the agitator in the glaze storage tank for 12 to 24 hours. After the glaze slurry is homogenized and aged, it is transported to the spray gun through the glaze slurry transport pipeline; (4) The coke oven door prefabricated block is delivered to the prefabricated block entrance of the glazing cabinet through the inlet conveyor chain, the inlet sealing valve on the glazing cabinet is opened, and the outlet sealing valve is closed. The inlet conveyor chain delivers the coke oven door prefabricated block to the glazing turntable in the glazing cabinet. After the inlet conveyor chain exits, the inlet sealing valve is closed to form a closed glazing environment; (5) According to the glazing thickness, the glazing control system automatically sets the glazing flow rate, glazing time and rotation speed of the glazing turntable of the spray gun; the glazing turntable rotates at a constant speed, and glazing is applied through the spray gun; (6) After the glazing is completed, the outlet sealing valve is opened, and the outlet conveyor chain takes out the glazed coke oven door prefabricated block. The coke oven door prefabricated block is naturally dried for 6 to 12 hours and then fired at high temperature to become a prefabricated block finished product; (7) The waste gas in the glazing cabinet is treated by a water-gas separator, and the harmful substances in the gas phase are adsorbed and filtered by a filter device and then returned to the fresh air for the glaze powder, and the liquid glaze slurry is recovered into the glaze storage tank; (8) The waste glaze slurry in the glazing cabinet is collected by a tray collector and then returned to the glaze storage tank.

9. The process for preparing glaze for coke oven door prefabricated block and automatically glazing according to claim 8, characterized in that: The entire production process adopts a fully closed cycle operation.

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