Deslagging and dust suppression device of positive-pressure direct-blowing type coal mill

Abstract

The slag discharging and dust suppression device of the positive pressure direct blowing type coal mill comprises a slag discharging assembly and a control assembly and further comprises a water sealing assembly and a slag removing assembly, the water sealing assembly is arranged below the slag discharging assembly, and the slag removing assembly is arranged in the water sealing assembly; the water seal assembly comprises a water seal tank, and a water inlet is formed in one side of the water seal tank; the bottom of the water seal tank is connected with one end of the communicating pipe, and a filter screen disc is arranged at the joint of the water seal tank and the communicating pipe; the other end of the communicating pipe is connected to an air pressure outlet of the coal mill and is used for receiving air pressure in the coal mill; a buoyancy pressing plate is attached to the inner wall of the end, close to the coal mill, of the communicating pipe, the size of the buoyancy pressing plate is consistent with the sectional size of the inner wall of the communicating pipe, and a sliding structure is formed between the buoyancy pressing plate and the inner wall of the communicating pipe. According to the utility model, the problem of operation environment pollution caused by easy dust and slag deposition at the slag discharge port of the coal mill can be improved, the slag discharge and removal work can be simpler, more convenient and faster, and the working efficiency of the slag discharge system of the coal mill is improved.

Description

Technical Field

[0001] The utility model relates to the field of positive pressure direct blowing type coal mill, in particular to a slag discharge and dust suppression device for a positive pressure direct blowing type coal mill. Background Art

[0002] At present, many power plant boilers use positive pressure direct blowing pulverizing system coal mills. Positive pressure direct blowing pulverizing system coal mills are key equipment in the pulverizing system of coal-fired power station boilers. They are mainly used to grind coal into powder for more efficient combustion. This type of coal mill is usually located before the primary fan. The fan delivers clean air, and there is no problem of coal powder wearing the blades. The coal mill works under the positive pressure state caused by the primary fan, and no cold air leaks in, which is beneficial to ensuring the dry output of the coal mill. However, this type of coal mill needs to discharge the waste and slag in the coal raw material in time when working to ensure the quality of the produced coal powder. The existing technology generally removes the waste slag and waste through the slag discharge device installed on the coal mill.

[0003] To this end, Chinese patent publication No. CN215465049U discloses a slag discharge device for a coal mill, comprising a protective box and a box door hinged to one side of the protective box, a through groove is centrally provided on the side of the top of the protective box away from the box door, and a feed pipe for connecting to the slag discharge port of the coal mill is fixedly installed in the through groove, dust removal components for dust removal are fixedly installed at positions corresponding to the feed pipes on both sides of the protective box, the dust removal component comprises a shell fixedly installed on the protective box and a dust suction hopper connected to the protective box, a slot for inserting a filter component is centrally provided at the top of one side of the shell, and the shell is divided into an air suction bin and a dust suction bin by the filter component.

[0004] However, the existing positive pressure direct blowing pulverizing system coal mill slag discharge system slag door and slag discharge door are prone to dust and slag accumulation during operation, resulting in the plug door being stuck and worn and not tightly closed, and serious air leakage and ash leakage during slag discharge, which can easily cause environmental pollution at the work site. A lot of time and manpower need to be wasted on cleaning during operation to maintain a normal working environment. At the same time, the slag discharge process of the existing design is also relatively cumbersome, and a simpler way is urgently needed to improve the efficiency of slag discharge. Utility Model Content

[0005] In view of the above problems, a positive pressure direct blowing coal mill slag discharge dust suppression device is provided. By adding a water seal component and a slag cleaning component, the problems of dust and slag accumulation on the slag discharge door of the existing coal mill during slag discharge and pollution of the working environment are solved.

[0006] In order to solve the problems of the prior art, the utility model provides a positive-pressure direct-blowing coal mill slag discharge and dust suppression device, comprising a slag discharge component and a control component, and also comprising a water seal component and a slag cleaning component, the water seal component is arranged below the slag discharge component, and the slag cleaning component is arranged inside the water seal component; the water seal component comprises a water seal pool, and a water inlet is installed on one side of the water seal pool; the bottom of the water seal pool is connected to one end of a connecting pipe, and a filter mesh plate is provided at the connection between the two; the other end of the connecting pipe is connected to the air pressure outlet of the coal mill for receiving the air pressure inside the coal mill; a buoyancy pressure plate is attached to the inner wall of the connecting pipe close to one end of the coal mill, the size of the buoyancy pressure plate is consistent with the cross-sectional size of the inner wall of the connecting pipe, and a sliding structure is formed between the buoyancy pressure plate and the inner wall of the connecting pipe.

[0007] Preferably, the slag cleaning assembly includes a slag cleaning car, the surface of the slag cleaning car is provided with small holes penetrating therethrough, and the bottom of the slag cleaning car is slidably connected to the inner wall of the water seal pool through a pulley; a material unloading flap is provided on one side of the slag cleaning car, and the material unloading flap forms an opening and closing structure with the slag cleaning car through an axle rod; a self-locking rod is installed at the bottom of one side of the outer wall of the slag cleaning car, and the self-locking rod is rotatably connected to the slag cleaning car, and the self-locking rod is used to provide a limiting structure for the material unloading flap.

[0008] Preferably, one end of the bottom of the water seal pool is connected to a discharge channel for the slag cleaning vehicle to enter and exit the water seal pool; one end of the discharge channel is provided with a driving platform for installing a driving device for the operation of the slag cleaning vehicle; the surface of the discharge channel is provided with a discharge baffle, which runs through the surface of the discharge channel, and the middle part of the two sides of the discharge baffle forms a rotating structure with the discharge channel through an axle rod, and the discharge baffle is used to cooperate with the slag cleaning vehicle to discharge materials.

[0009] Preferably, the slag cleaning component also includes a winding roller, which is installed on the surface of the driving platform; winding ropes are respectively connected to the two ends of the surface of the winding roller, and the winding roller is connected to one end of the surface of the slag cleaning vehicle through the winding rope; a fixed pulley is installed parallel to the surface of the driving platform on one side of the winding roller, and the winding rope is attached to the rotating wheel surface of the fixed pulley, and the fixed pulley is used to change the running direction of the winding rope.

[0010] Preferably, the slag discharge assembly includes a slag storage box, one end of which is connected to the slag discharge door of the coal mill, and the other end of the slag storage box is connected to a slag discharge pipe; a slag discharge door is provided at the bottom of the slag discharge pipe, the slag discharge door is arranged above the slag cleaning vehicle, and the height of the slag discharge door is set to be lower than the top of the water seal pool.

[0011] Preferably, the control component includes a controller, a liquid level sensor and an electromagnetic air release valve; the liquid level sensor is installed on the upper part of one side of the water seal pool to monitor the liquid level in the water seal pool; the electromagnetic air release valve is installed on the pipe wall of the connecting pipe close to one end of the coal mill, and the electromagnetic air release valve is arranged on the buoyancy pressure plate; the controller is communicated with the liquid level sensor and the electromagnetic air release valve.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model adds structures such as a water seal pool, a connecting pipe and a buoyancy pressure plate, so that the slag discharge door can be immersed below the liquid level of the water seal pool for discharge, so that the waste slag and waste materials in the slag discharge port will not evaporate and fly everywhere, thereby improving the working environment during operation. At the same time, the liquid level in the water seal pool can be adjusted in real time by introducing the pressure in the coal mill, so that the slag discharge port can always be kept below the liquid level inside the water seal pool, and the slag discharge port can be kept clean, which is convenient for its smooth operation.

[0014] 2. The utility model ensures easy and convenient unloading of materials when the slag cleaning vehicle is full and unloaded by adding structures such as a slag cleaning vehicle, a material unloading flap, a self-locking rod and a material unloading baffle, reduces manual assistance, saves labor costs, and ensures that waste slag will not roll everywhere during unloading, thereby improving the working environment.

[0015] 3. The utility model provides a discharge channel, a driving platform, a winding roller, a winding rope and other structures, so that the slag cleaning vehicle can smoothly enter and exit the water seal pool along the discharge channel, making the slag cleaning process simpler and more convenient, reducing labor costs, and improving the working efficiency of the coal mill slag discharge system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the slag discharge and dust suppression device of a positive pressure direct blowing coal mill.

[0017] Figure 2 It is the front view of the slag discharge and dust suppression device of the positive pressure direct blowing coal mill.

[0018] Figure 3 This is a cross-sectional view at point A of the front view of the slag discharge and dust suppression device of a positive pressure direct blowing coal mill.

[0019] Figure 4 It is a three-dimensional diagram of the water seal assembly of the slag discharge and dust suppression device of a positive pressure direct blowing coal mill.

[0020] Figure 5 It is a three-dimensional diagram of the slag cleaning components of the slag discharge and dust suppression device of a positive pressure direct blowing coal mill.

[0021] Figure 6 This is an enlarged view of the slag cleaning vehicle of the positive pressure direct blowing coal mill slag discharge and dust suppression device when it is started to unload.

[0022] The numbers in the figure are: 1. Slag discharge assembly; 11. Slag storage box; 12. Slag discharge pipe; 13. Slag discharge door; 2. Water seal assembly; 21. Water seal pool; 22. Connecting pipe; 23. Buoyancy pressure plate; 24. Filter mesh plate; 25. Water inlet; 26. Discharge channel; 27. Driving platform; 28. Unloading baffle; 3. Slag cleaning assembly; 31. Slag cleaning vehicle; 32. Unloading flap; 33. Self-locking rod; 34. Winding roller; 35. Winding rope; 36. Fixed pulley; 4. Control assembly; 41. Controller; 42. Liquid level sensor; 43. Solenoid vent valve. DETAILED DESCRIPTION

[0023] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] like Figure 1 , 2 As shown in Figures 3 and 4, a positive pressure direct blowing coal mill slag discharge and dust suppression device includes a slag discharge component 1 and a control component 4, and also includes a water seal component 2 and a slag cleaning component 3. The water seal component 2 is arranged below the slag discharge component 1, and the slag cleaning component 3 is arranged inside the water seal component 2; the water seal component 2 includes a water seal pool 21, and a water inlet 25 is installed on one side of the water seal pool 21; the bottom of the water seal pool 21 is connected to one end of a connecting pipe 22, and a filter screen 24 is provided at the connection between the two; the other end of the connecting pipe 22 is connected to the air pressure outlet of the coal mill for receiving the air pressure inside the coal mill; a buoyancy pressure plate 23 is attached to the inner wall of the connecting pipe 22 close to one end of the coal mill, and the size of the buoyancy pressure plate 23 is consistent with the cross-sectional size of the inner wall of the connecting pipe 22, and a sliding structure is formed between the buoyancy pressure plate 23 and the inner wall of the connecting pipe 22.

[0025] The slag discharge and dust suppression device can discharge the waste slag removed by the coal mill in the process of making coal powder from the coal mill through the slag discharge component 1, so as to ensure that the quality of coal powder produced by the coal mill is higher. The water seal component 2 arranged below the slag discharge component 1 fills the water seal pool 21 with water through the water inlet 25, so that the liquid level in the water seal pool 21 reaches a preset height, and through the principle of communicating vessels, the liquid level in the connecting pipe 22 on one side of the water seal pool 21 is also raised at the same time; the liquid level in the connecting pipe 22 simultaneously raises the buoyancy pressure plate 23, and one end of the connecting pipe 22 is connected to the air pressure outlet of the coal mill, and the air pressure generated inside the coal mill enters the connecting pipe 22 through the air pressure outlet, and the air pressure generates pressure on the buoyancy pressure plate 23, and pushes the buoyancy pressure plate 23 to squeeze the liquid level in the connecting pipe 22 downward, and raises the liquid level in the water seal pool 21 through the principle of communicating vessels, so as to ensure that the water in the water seal pool 21 can cover the bottom of the slag discharge component 1 and have a dust suppression effect.

[0026] like Figure 1 , 3As shown in Figures 5 and 6, the slag cleaning component 3 includes a slag cleaning car 31. The surface of the slag cleaning car 31 is provided with a small hole penetrating therethrough. The bottom of the slag cleaning car 31 is slidably connected to the inner wall of the water seal pool 21 through a pulley; a material unloading flap 32 is provided on one side of the slag cleaning car 31, and the material unloading flap 32 forms an opening and closing structure with the slag cleaning car 31 through an axle rod; a self-locking rod 33 is installed at the bottom of one side of the outer wall of the slag cleaning car 31, and the self-locking rod 33 is rotatably connected to the slag cleaning car 31, and the self-locking rod 33 is used to provide a limiting structure for the material unloading flap 32.

[0027] The slag cleaning car 31 is arranged just below the slag discharge assembly 1 and can receive the waste slag discharged by the coal mill through the slag discharge assembly 1. A rotatable unloading flap 32 is installed on one side of the tail of the slag cleaning car 31 through an axle rod, and the bottom side of the unloading flap 32 is connected to the slag cleaning car 31 through a magnetic bead. When there is no waste material inside the slag cleaning car 31, the unloading flap 32 can automatically fit the slag cleaning car 31 to achieve a closed state; a self-locking rod 33 installed on the slag cleaning car 31 is controlled to rotate by a waterproof servo motor. When the slag cleaning car 31 receives the waste slag, the self-locking rod 33 is driven to rotate by the servo motor to provide a stable limiting structure for the unloading flap 32, so that the unloading flap 32 will not rotate and displace, ensuring that the waste slag received by the slag cleaning car 31 does not leak. At the same time, when it is necessary to open the unloading flap 32, the servo motor controls the self-locking rod 33 to contact the limiting structure, and the gravity of the waste slag causes the unloading flap 32 to open, so that the slag cleaning car 31 can quickly discharge the waste slag.

[0028] like Figure 1 , 2 As shown in Figures 3 and 4, a discharge channel 26 is connected to one end of the bottom of the water seal pool 21 for the slag cleaning vehicle 31 to enter and exit the water seal pool 21; a driving platform 27 is provided at one end of the discharge channel 26 for installing a driving device for the operation of the slag cleaning vehicle 31; a discharge baffle 28 is provided on the surface of the discharge channel 26, and the discharge baffle 28 runs through the surface of the discharge channel 26, and the middle parts of both sides of the discharge baffle 28 form a rotating structure with the discharge channel 26 through the shaft rod, and the discharge baffle 28 is used to cooperate with the slag cleaning vehicle 31 to discharge materials.

[0029] A discharge channel 26 is installed at one end of the top of the water seal pool 21. The discharge channel 26 provides a channel for the slag cleaning vehicle 31 to move up and down. When the slag cleaning vehicle 31 needs to unload the internal waste slag, it runs upward along the discharge channel 26, leaves the water surface inside the water seal pool 21, and runs all the way to the top of the discharge baffle 28. During the process, the discharge baffle 28 can smoothly allow the slag cleaning vehicle 31 to pass through the rotating structure between it and the discharge channel 26, and form a shielding structure at the tail of the slag cleaning vehicle 31. When the slag cleaning vehicle 31 opens the discharge flap 32 to unload the waste slag, the discharge baffle 28 can prevent the waste slag from splashing onto the discharge channel 26, and cooperate with the slag cleaning vehicle 31 to smoothly unload the waste.

[0030] like Figure 1 ,3 As shown in Figures 5 and 6, the slag cleaning component 3 also includes a winding roller 34, which is installed on the surface of the driving platform 27; winding ropes 35 are respectively connected to the two ends of the surface of the winding roller 34, and the winding roller 34 is connected to one end of the surface of the slag cleaning vehicle 31 through the winding rope 35; a fixed pulley 36 is installed parallel to the surface of the driving platform 27 on one side of the winding roller 34, and the winding rope 35 is attached to the rotating wheel surface of the fixed pulley 36, and the fixed pulley 36 is used to change the running direction of the winding rope 35.

[0031] The winding roller 34 is provided with rotational drive by an external motor. When the slag cleaning vehicle 31 needs to start unloading waste slag, the external motor is turned on to drive the winding roller 34 to rotate, and the winding rope 35 is wound up circle by circle. The winding rope 35 is turned through the fixed pulley 36 and then connected to one end of the slag cleaning vehicle 31. When the winding rope 35 is wound, the slag cleaning vehicle 31 can be pulled out of the water seal pool 21 and pulled upward along the discharge channel 26 until the slag cleaning vehicle 31 reaches the designated unloading position.

[0032] like Figure 1 , 2 As shown in Figures 3, the slag discharge assembly 1 includes a slag storage box 11, one end of which is connected to the slag discharge door of the coal mill, and the other end of the slag storage box 11 is connected to a slag discharge pipe 12; a slag discharge door 13 is provided at the bottom of the slag discharge pipe 12, and the slag discharge door 13 is arranged above the slag cleaning vehicle 31, and the height of the slag discharge door 13 is set to be lower than the top of the water seal pool 21.

[0033] The positive pressure direct blowing coal mill grinds the larger coal raw materials into coal powder through the internal grinding structure and outputs it to the power generation equipment, while the invalid materials mixed in the coal raw materials are treated as waste slag and enter the slag storage box 11 through the slag discharge door. When the waste slag in the slag storage box 11 accumulates to a certain amount, it falls directly into the slag cleaning vehicle 31 through the slag discharge pipe 12 and the slag discharge door 13. In this structure, the slag discharge door 13 is submerged below the liquid surface inside the water seal pool 21. When the slag discharge door 13 is opened to discharge the waste slag, it can ensure that no dust is raised, and at the same time, it can ensure that the inside of the slag discharge door 13 is clean, thereby ensuring its normal operation.

[0034] like Figure 1 , 2 As shown in Figures 3 and 4, the control component 4 includes a controller 41, a liquid level sensor 42 and an electromagnetic air release valve 43; the liquid level sensor 42 is installed on the upper part of one side of the water seal pool 21, and is used to monitor the liquid level height in the water seal pool 21; the electromagnetic air release valve 43 is installed on the pipe wall of the connecting pipe 22 close to one end of the coal mill, and the electromagnetic air release valve 43 is arranged on the buoyancy pressure plate 23; the controller 41 is communicatively connected with the liquid level sensor 42 and the electromagnetic air release valve 43.

[0035] The liquid level sensor 42 is used to monitor the height of the liquid level inside the water seal pool 21 in real time, and transmit the monitoring results to the controller 41. When the liquid level is higher than the position of the liquid level sensor 42, the controller 41 controls the electromagnetic air release valve 43 to reduce the air pressure above the buoyancy pressure plate 23, so that the liquid level in the connecting pipe 22 rises and the liquid level in the water seal pool 21 decreases; when the liquid level in the water seal pool 21 is too low to submerge the slag discharge door 13, the liquid level sensor 42 transmits a signal to the controller 41, and the controller 41 closes the electromagnetic air release valve 43, so that the buoyancy pressure plate 23 is subjected to the increased air pressure, thereby lowering the liquid level in the connecting pipe 22 and raising the liquid level in the water seal pool 21, so that the slag discharge door 13 is submerged under the water again.

[0036] The above embodiments only express one or several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A positive pressure direct blowing coal mill slag discharge and dust suppression device, comprising a slag discharge component (1) and a control component (4); It is characterized in that It also includes a water seal component (2) and a slag cleaning component (3), wherein the water seal component (2) is arranged below the slag discharge component (1), and the slag cleaning component (3) is arranged inside the water seal component (2); The water seal assembly (2) comprises a water seal pool (21), and a water inlet (25) is installed on one side of the water seal pool (21); The bottom of the water seal pool (21) is connected to one end of the connecting pipe (22), and a filter screen (24) is provided at the connection between the two. The other end of the connecting pipe (22) is connected to the gas pressure outlet of the coal mill to receive the gas pressure inside the coal mill; A buoyancy pressure plate (23) is attached to the inner wall of the connecting pipe (22) near one end of the coal mill. The size of the buoyancy pressure plate (23) is consistent with the cross-sectional size of the inner wall of the connecting pipe (22), and a sliding structure is formed between the buoyancy pressure plate (23) and the inner wall of the connecting pipe (22).

2. The positive pressure direct blowing coal mill slag discharge and dust suppression device according to claim 1 is characterized in that: The slag cleaning assembly (3) comprises a slag cleaning vehicle (31), the surface of the slag cleaning vehicle (31) is provided with a through hole, and the bottom of the slag cleaning vehicle (31) is slidably connected to the inner wall of the water seal pool (21) via a pulley; A material unloading flap (32) is provided on one side of the slag cleaning vehicle (31), and the material unloading flap (32) is an opening and closing structure formed by the shaft rod and the slag cleaning vehicle (31); A self-locking rod (33) is installed at the bottom of one side of the outer wall of the slag cleaning vehicle (31), and the self-locking rod (33) is rotatably connected to the slag cleaning vehicle (31). The self-locking rod (33) is used to provide a limiting structure for the unloading flap (32).

3. The positive pressure direct blowing coal mill slag discharge and dust suppression device according to claim 1, characterized in that: One end of the bottom of the water seal pool (21) is connected to a discharge channel (26) for a slag removal vehicle (31) to enter and exit the water seal pool (21); A driving platform (27) is provided at one end of the discharge channel (26) for installing a driving device for the operation of the slag cleaning vehicle (31); A material discharge baffle (28) is provided on the surface of the material discharge channel (26). The material discharge baffle (28) penetrates the surface of the material discharge channel (26), and the middle parts of both sides of the material discharge baffle (28) form a rotating structure with the material discharge channel (26) through an axle rod. The material discharge baffle (28) is used to cooperate with the slag cleaning vehicle (31) to discharge materials.

4. The positive pressure direct blowing coal mill slag discharge and dust suppression device according to claim 1, characterized in that: The slag cleaning assembly (3) further comprises a winding roller (34), and the winding roller (34) is mounted on the surface of the driving platform (27); The two ends of the surface of the winding roller (34) are respectively connected with winding ropes (35), and the winding roller (34) is connected to one end of the surface of the slag cleaning vehicle (31) through the winding rope (35); A fixed pulley (36) is installed parallel to the surface of the driving platform (27) on one side of the winding roller (34), and the winding rope (35) is attached to the rotating wheel surface of the fixed pulley (36). The fixed pulley (36) is used to change the running direction of the winding rope (35).

5. The positive pressure direct blowing coal mill slag discharge and dust suppression device according to claim 1, characterized in that: The slag discharge assembly (1) comprises a slag storage box (11), one end of the slag storage box (11) is connected to a slag discharge door of a coal mill, and the other end of the slag storage box (11) is connected to a slag discharge pipe (12); A slag discharge door (13) is provided at the bottom of the slag discharge pipe (12). The slag discharge door (13) is arranged above the slag cleaning vehicle (31), and the height of the slag discharge door (13) is set to be lower than the top of the water seal pool (21).

6. The positive pressure direct blowing coal mill slag discharge and dust suppression device according to claim 1, characterized in that: The control component (4) includes a controller (41), a liquid level sensor (42) and an electromagnetic air release valve (43); A liquid level sensor (42) is installed on an upper side of the water seal pool (21) and is used to monitor the height of the liquid level in the water seal pool (21); The electromagnetic air release valve (43) is installed on the pipe wall of the connecting pipe (22) close to one end of the coal mill, and the electromagnetic air release valve (43) is arranged on the buoyancy pressure plate (23); The controller (41) is communicatively connected with the liquid level sensor (42) and the electromagnetic air release valve (43).

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