A structure and method for preventing clogging of a vertical mill inlet system

Abstract

The invention discloses a structure and method for preventing a vertical mill inlet system from being blocked, and relates to the field of cement raw material grinding, including a vertical mill system, wherein the vertical mill system includes a small bin box, a chain plate scale and a mill inlet chute, and further includes: a wind and heat main line, wherein an air outlet of the wind and heat main line is connected with a hot air induced air duct, one end of the hot air induced air duct is provided with a three-way valve, and an air outlet of the three-way valve is respectively connected with a first induced air duct and a second induced air duct, the first induced air duct is connected with the bottom of the small bin box, and the second induced air duct is connected with the chain plate scale; an air outlet duct, wherein an air outlet duct is provided at the back of the small bin box, and one end of the air outlet duct passes through the small bin box and is connected with the mill inlet chute, and the pressure at the mill inlet pipeline and the pressure difference at the mill inlet chute are used to make the sealed small bin into a box-type through structure, so as to form circulating hot air, and the circulating hot air dries the materials in the inlet bin, the scale body and the mill inlet chute.

Description

Technical Field

[0001] The invention relates to the field of cement raw material grinding, in particular to a structure and method for preventing clogging of a vertical mill inlet system. Background Art

[0002] Cement clinker is made of limestone, clay and iron as main raw materials, which are prepared into raw meal in appropriate proportions, burned until partially or completely melted, and then cooled to obtain semi-finished products. Raw meal vertical mill system is usually used in the cement production process. In order to effectively solve the problem of air leakage in raw meal vertical mill system, most cement clinker production lines have modified the mill inlet part and adopted sealed small silos and sealed chain plate scales, and the air leakage problem has been effectively solved.

[0003] Due to weather reasons, high moisture content of incoming materials, and the use of highly viscous materials in the batching, after the equipment had been running for a long time, problems such as material sticking and clogging in the small bin vertebrae, sticking and clogging in the grinding chute, and sticking and clogging in the sealed scale body occurred. These problems required the equipment to be stopped for processing, which was time-consuming and labor-intensive, and posed a safety risk, which had a certain impact on the normal production of cement. Summary of the invention

[0004] The object of the present invention is to provide a structure and method for preventing a vertical mill inlet system from being blocked, so as to solve the problem of production stoppage caused by blockage of the vertical mill inlet system.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A structure for preventing the clogging of a vertical mill inlet system includes a vertical mill system, wherein the vertical mill system includes a small bin box, a chain plate scale and an inlet chute, and further includes:

[0007] A main air-heating line, wherein the air outlet of the main air-heating line is connected to a hot air induced air duct, a three-way valve is provided at one end of the hot air induced air duct, and the air outlet of the three-way valve is respectively connected to a first induced air duct and a second induced air duct, wherein the first induced air duct is connected to the bottom of the small warehouse box, and the second induced air duct is connected to a chain plate scale;

[0008] An air outlet pipe is arranged on the back of the small storage box body, and one end of the air outlet pipe passes through the small storage box body and is connected to the grinding wheel.

[0009] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0010] In an optional solution: a temperature measuring thermal resistor is installed on the second air duct.

[0011] In an optional solution: a negative pressure gauge is installed on the air outlet pipe.

[0012] In an optional solution, butterfly valves are installed on the first air duct, the second air duct and the air outlet duct.

[0013] In an optional solution: the hot air induced air duct, the first induced air duct, the second induced air duct and the air outlet duct are all round tubes, and the diameter of the round tubes is 200 mm.

[0014] In an optional solution: the diameter of the butterfly valve is 200 mm.

[0015] In an optional solution: a method for preventing blockage of a vertical mill inlet system, the method comprising the following operations:

[0016] 1) Change the small warehouse structure to a box-through structure for drying hot air storage containers;

[0017] 2) A 200mm diameter round pipe is used to connect the main air heat pipe entering the mill and the bottom of the small warehouse box. A three-way valve is installed in the middle of the round pipe. A set of pipes connected to the chain plate scale is added through the three-way valve. A 200mm diameter butterfly valve is installed on the pipes connected to the small warehouse box and the chain plate scale. The butterfly valve is used to control the drying air volume and air temperature.

[0018] 3) A 200mm diameter round tube is connected to the back of the upper part of the small warehouse, and the other end of the round tube is connected to the side of the grinding slide. A 200mm diameter butterfly valve is used in the middle of the round tube to control the air temperature and air volume;

[0019] 4) Utilize the pressure at the mill inlet pipe and the pressure difference of about 2000Pa at the mill inlet chute to form circulating hot air, and use the circulating hot air to temporarily dry the materials entering the warehouse, the scale body, and the mill inlet chute. At the same time, use the micro bubbles generated by the instantaneous contact between high temperature and low temperature materials to form a diaphragm between the inner wall of the small warehouse and the material to prevent blockage accidents.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] It effectively solves a series of process problems caused by material adhesion on the cement production line. By utilizing the pressure at the inlet pipe and the pressure difference at the inlet chute in the mill, the sealed small warehouse is made into a box-type through structure to form circulating hot air. The circulating hot air temporarily dries the materials entering the warehouse, inside the scale body, and at the inlet chute. At the same time, micro bubbles generated by the instantaneous contact between high temperature and low temperature materials form a diaphragm between the inner wall of the small warehouse and the material to prevent blockage accidents. It basically completely solves the blockage and production stoppage problems caused by adhesion and excessive moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the circulating hot air structure.

[0023] Figure 2 It is the left view of the circulating hot air structure.

[0024] Notes on the accompanying figures: 1-small warehouse box, 2-hot air induced draft duct, 3-first induced draft duct, 4-second induced draft duct, 5-butterfly valve, 6-three-way valve, 7-air outlet duct, 8-grinding slide, 9-temperature measuring thermal resistor, 10-negative pressure gauge. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] like Figure 1-2 As shown, a structure for preventing the blocking of a vertical mill inlet system provided by an embodiment of the present invention includes a vertical mill system, wherein the vertical mill system includes a small bin box 1, a chain plate scale and an inlet mill chute 8, and further includes:

[0028] The hot air main line, the outlet of which is connected to a hot air induction pipe 2, one end of which is provided with a three-way valve 6, the outlet of which is respectively connected to a first induction pipe 3 and a second induction pipe 4, the first induction pipe 3 is connected to the bottom of the small warehouse box 1, and the second induction pipe 4 is connected to a chain plate scale;

[0029] An air outlet pipe 7 is provided on the back of the small storage box 1 , and one end of the air outlet pipe 7 passing through the small storage box 1 is connected to a grinding slide 8 .

[0030] like Figure 1 As shown, as a preferred embodiment of the present invention, a temperature measuring thermal resistor 9 is installed on the second air duct 4 to prevent excessive temperature from affecting the internal lubrication system.

[0031] like Figure 2 As shown, as a preferred embodiment of the present invention, a negative pressure gauge 10 is installed on the air outlet pipe 7 to ensure smooth ventilation in the pipe.

[0032] like Figure 1 As shown, as a preferred embodiment of the present invention, the hot air induced draft duct 2, the first induced draft duct 3, the second induced draft duct 4 and the air outlet duct 7 are all round tubes with a diameter of 200 mm. The first induced draft duct 3, the second induced draft duct 4 and the air outlet duct 7 are all installed with a butterfly valve 5 with a diameter of 200 mm. The butterfly valve 5 is temperature-resistant above 200°C to prevent deformation due to high temperature during use.

[0033] 1. If Figure 1As shown, as a preferred embodiment of the present invention, a method for preventing a vertical mill inlet system from being blocked includes the following operations:

[0034] 1) Change the small warehouse structure to a box-through structure for drying hot air storage containers;

[0035] 2) A 200mm diameter round pipe is used to connect the main air heat pipe entering the mill and the bottom of the small storage box 1. A three-way valve 6 is installed in the middle of the round pipe. A set of pipes connected to the chain plate scale is added through the three-way valve 6. A 200mm diameter butterfly valve 5 is installed on the pipes connected to the small storage box 1 and the chain plate scale. The butterfly valve 5 is used to control the drying air volume and air temperature.

[0036] 3) A 200mm diameter round tube is connected to the back of the upper part of the small warehouse box 1, and the other end of the round tube is connected to the side of the grinding slide 8. A 200mm diameter butterfly valve 5 is used in the middle of the round tube to control the air temperature and air volume;

[0037] 4) Utilize the pressure at the mill inlet pipe and the pressure difference of about 2000Pa at the mill inlet chute 8 to form circulating hot air. The materials entering the warehouse, the scale body and the mill inlet chute 8 are temporarily dried by the circulating hot air. At the same time, the micro bubbles generated by the instantaneous contact between high temperature and low temperature materials form a diaphragm between the inner wall of the small warehouse and the materials to prevent blockage accidents.

[0038] The above-mentioned embodiment of the present invention provides a structure and method for solving the blockage of the vertical mill system. The small bin box body 1 is designed as a box-through structure, and a circulation loop is formed between the mill inlet pipeline and the mill inlet chute 8 through the sealed small bin to ensure continuous hot air supply; in order to prevent the influence of excessive wind temperature and excessive wind on the system inside the mill, three butterfly valves 5 are used to control the wind temperature and air volume; in order to prevent dust settling in the hot air of the system from causing pipeline blockage, a dust reduction discharge port is added, and the settled raw material powder in the pipeline is discharged regularly; in order to prolong the residence time of the hot air in the box-through sealed small bin, a bottom-in and top-out form is adopted.

[0039] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A structure for preventing the clogging of a vertical mill inlet system, comprising a vertical mill system, wherein the vertical mill system comprises a small bin box, a chain plate scale and an inlet chute, characterized in that: Also includes: A main air-heating line, wherein the air outlet of the main air-heating line is connected to a hot air induced air duct, a three-way valve is provided at one end of the hot air induced air duct, and the air outlet of the three-way valve is respectively connected to a first induced air duct and a second induced air duct, wherein the first induced air duct is connected to the bottom of the small warehouse box, and the second induced air duct is connected to a chain plate scale; An air outlet pipe is provided on the back of the small storage box, and one end of the air outlet pipe passing through the small storage box is connected to the grinding wheel; A temperature measuring thermal resistor is installed on the second air duct; A negative pressure gauge is installed on the air outlet pipe; The first air duct, the second air duct and the air outlet duct are all equipped with butterfly valves; The hot air induction pipe, the first induction pipe, the second induction pipe and the air outlet pipe are all round pipes, and the diameter of the round pipe is 200 mm; The diameter of the butterfly valve is 200 mm; The anti-blocking method of the structure of the vertical mill inlet system anti-blocking includes the following operations: 1) Change the small warehouse structure to a box-through structure for drying hot air storage containers; 2) A 200mm diameter round pipe is used to connect the main air heat pipe entering the mill and the bottom of the small warehouse box. A three-way valve is installed in the middle of the round pipe. A set of pipes connected to the chain plate scale is added through the three-way valve. Butterfly valves with a diameter of 200mm are installed on the pipes connected to the small warehouse box and the chain plate scale. The butterfly valve is used to control the drying air volume and air temperature. 3) A 200mm diameter round tube is connected to the back of the upper part of the small warehouse, and the other end of the round tube is connected to the side of the grinding slide. A 200mm diameter butterfly valve is used in the middle of the round tube to control the air temperature and air volume; 4) The pressure difference between the mill inlet pipe and the mill inlet chute is used to form circulating hot air, which can temporarily dry the materials entering the warehouse, the scale body, and the mill inlet chute. At the same time, the micro bubbles generated by the instantaneous contact between high temperature and low temperature materials form a diaphragm between the inner wall of the small warehouse and the materials to prevent blockage accidents.

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