Rotary jet cyclone preheater waste gas dust cleaning device

Abstract

The present application relates to cement production equipment field, specifically to a kind of rotary jet cyclone preheater waste gas dust cleaning device, including box, dust collector, filter dust belt, steam generating device, driving device, water storage tank;The box is symmetrically provided with air inlet pipe air outlet pipe at both ends;The right end of the box is equipped with dust collector;Filter dust belt is rotatably installed in the inside of the box;The present application is heated by setting steam generating device, using the waste heat in flue gas to heat the water inside steam generating device, so that it produces water vapor, then high-pressure water vapor is used to clean dust on filter dust belt, make full use of the waste heat inside flue gas, and can effectively clean dust on filter dust belt;By setting water storage tank, water pressure valve can be used to supplement water in spiral heat pipe in time, and two spiral heat pipes are set to be communicated with each other, so that flue gas and water in spiral heat pipe have higher heat transfer efficiency.

Description

Technical Field

[0001] This invention relates to the field of cement production equipment, specifically to a dust removal device for exhaust gas from a rotary jet cyclone preheater. Background Technology

[0002] Cement production can be divided into two types based on the raw meal preparation method: dry process (including semi-dry process) and wet process (including semi-wet process). I. Dry process production: This involves simultaneously drying and grinding the raw materials, or drying them first, grinding them into raw meal powder, and then feeding them into a dry kiln for calcination into clinker. However, there is also a method where raw meal powder is mixed with an appropriate amount of water to form raw meal balls, which are then fed into a Lepol kiln for calcination into clinker; this is called the semi-dry process, which is still a type of dry process production. II. Wet process production: This involves adding water to the raw materials, grinding them into a raw meal slurry, and then feeding it into a wet kiln for calcination into clinker. There is also a method where the raw meal slurry prepared in the wet process is dehydrated, formed into raw meal blocks, and then calcined into clinker in a kiln; this is called the semi-wet process, which is still a type of wet process production.

[0003] The new dry process cement production technology was developed in the 1950s. The new dry process cement production line refers to cement produced using the new precalciner process. Its production is based on suspension preheater and precalciner technology, and adopts new raw material and fuel homogenization and energy-saving grinding technology and equipment. The entire line adopts computer distributed control to realize the automation of the cement production process and achieve high efficiency, high quality, low consumption and environmental protection.

[0004] The suspension preheater preheats the materials, but there are two problems: first, the exhaust gas contains a large amount of limestone dust and calcination smoke, which would cause serious air pollution if directly discharged; second, the exhaust gas also contains a large amount of heat, which would waste energy if directly discharged. Summary of the Invention

[0005] Therefore, this invention was made in view of the above problems. The purpose of this invention is to heat the water inside the steam generating device by setting up a steam generating device and a driving device, so as to generate water vapor by using the waste heat in the flue gas. The water vapor is used to drive the dust filter belt to rotate, so that the dust attached to the dust filter belt at the air inlet can be transferred in time and cleaned away by high-pressure water vapor. This solves the problems of dust emission, smoke pollution and waste heat waste in the exhaust gas of existing suspension preheaters. The invention achieves the above objectives through the following technical solutions.

[0006] A dust removal device for exhaust gas from a rotary jet cyclone preheater includes a housing, a dust collection box, a filter belt, a steam generating device, a drive device, and a water storage tank. The housing has symmetrically arranged inlet and outlet pipes at both ends. A dust collection box is located at the right end of the housing. A filter belt is rotatably installed inside the housing. The steam generating device consists of a spiral heat transfer tube, a steam box, a guide pipe, a pressure valve, a rotating rod, and an impeller. The steam box is located in the middle of the spiral heat transfer tube. A guide pipe is located on one side of the top of the steam box, and the vertical section of the guide pipe has multiple jet holes. A rotating rod is rotatably installed inside the vertical section of the guide pipe, and an impeller is fixedly installed at the lower end of the rotating rod. A gear is fixedly installed at the upper end of the rod; the driving device consists of a transmission shaft, a gear, and a drive gear; the transmission shaft is rotatably installed at the top of the housing; a gear is fixedly installed at the upper end of the transmission shaft, and the gear meshes with a gear on the steam generating device; a drive gear is fixedly installed at the lower end of the transmission shaft; the water storage tank is a semi-circular housing, and the water storage tank is fixedly installed on the opposite side of the dust collection box on the housing; the upper end of the water storage tank is provided with a water inlet pipe for adding water, and the lower end of the water storage tank is provided with a water outlet pipe for draining water. The other end of the water outlet pipe is connected to the bottom of the spiral heat transfer tube on the steam generating device, and the water in the water outlet pipe can enter the spiral heat transfer tube.

[0007] Preferably, the upper end of the dust filter belt is provided with teeth; the drive gear meshes with the teeth on the dust filter belt.

[0008] Preferably, the steam box is connected to the spiral heat transfer tube.

[0009] Preferably, one end of the horizontal section of the air guide pipe can be connected to the steam box, and a gas pressure valve is provided at the connection with the steam box.

[0010] Preferably, a water pressure valve is provided at the connection between the water outlet pipe and the water storage tank.

[0011] Preferably, the spiral heat transfer tube is two spiral tubes that are connected vertically.

[0012] Beneficial effects of this invention:

[0013] 1. By setting up a steam generating device, the residual heat in the flue gas is used to heat the water inside the steam generating device to generate steam. Then, the high-pressure steam is used to clean the dust on the filter belt, making full use of the residual heat inside the flue gas and effectively cleaning the dust on the filter belt.

[0014] 2. By setting up a water storage tank, the water in the spiral heat transfer tube can be replenished in a timely manner using a water pressure valve. Furthermore, the two spiral heat transfer tubes are connected vertically to each other, which makes the heat transfer efficiency between the flue gas and the water in the spiral heat transfer tube higher.

[0015] 3. By setting up a drive device, the dust filter belt is driven to rotate by the flow of water vapor. Through the continuous rotation of the dust filter belt, the dust attached to the dust filter belt at the air inlet can be transferred and cleaned in time, realizing real-time continuous dust removal. This is lower in cost and does not require a special power unit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a rotary jet cyclone preheater exhaust gas dust cleaning device according to the present invention.

[0017] Figure 2 This is a partial structural schematic diagram of a rotary jet cyclone preheater exhaust gas dust cleaning device according to the present invention.

[0018] Figure 3 This is a top view of a rotary jet cyclone preheater exhaust gas dust cleaning device according to the present invention.

[0019] Figure 4 for Figure 3 Sectional view along line AA.

[0020] Figure 5 for Figure 3 Sectional view along the BB line.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Housing; 110. Inlet pipe; 120. Outlet pipe; 200. Dust collection box; 300. Dust filter belt; 310. Toothed belt; 400. Steam generating device; 410. Spiral heat transfer pipe; 420. Steam box; 430. Air guide pipe; 431. Jet nozzle; 440. Air pressure valve; 450. Rotating rod; 460. Impeller; 470. Gear 1; 500. Drive unit; 510. Drive shaft; 520. Gear 2; 530. Drive gear; 600. Water storage tank; 610. Water inlet pipe; 620. Water outlet pipe; 630. Water pressure valve. Detailed Implementation

[0023] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings.

[0024] like Figure 1 , 2 As shown, a rotary jet cyclone preheater exhaust gas dust cleaning device includes: a housing 100, a dust collection box 200, a dust filter belt 300, a steam generating device 400, a driving device 500, and a water storage tank 600.

[0025] like Figure 2As shown, the housing 100 is a cylindrical shell. At the front and rear ends of the housing 100, there are symmetrical air inlet pipes 110 for air intake and air outlet pipes 120 for air exhaust. At the right end of the housing 100, there is a dust collection box 200 for collecting dust. Inside the housing 100, a dust filter belt 300 for dust removal is rotatably installed. The upper end of the dust filter belt 300 is provided with teeth 310.

[0026] like Figures 2 to 5 As shown, the steam generating device 400 comprises a spiral heat transfer tube 410, a steam box 420, a gas guide pipe 430, a gas pressure valve 440, a rotating rod 450, an impeller 460, and a gear 470. The spiral heat transfer tube 410 consists of two interconnected spiral tubes. A steam box 420 is located in the middle of the spiral heat transfer tube 410 and is connected to the spiral heat transfer tube 410. A gas guide pipe 430 is located on one side of the top of the steam box 420. The gas guide pipe 430 is a hollow inverted L-shaped pipe. One horizontal end of the gas guide pipe 430 can connect to the steam box 420, and a gas pressure valve 440 is located at the connection point with the steam box 420. The gas pressure valve 440 is a pressure-controlled valve. The gas pressure control valve 440 will open when the steam pressure inside the steam box 420 reaches the threshold. The high-pressure steam in the steam box 420 will enter the air guide pipe 430 through the gas pressure valve 440. The vertical section of the air guide pipe 430 is provided with multiple jet holes 431. The jet holes 431 can spray the high-pressure steam in the air guide pipe 430 onto the inner surface of the dust filter belt 300. A rotating rod 450 is rotatably installed in the vertical section of the air guide pipe 430. An impeller 460 is fixedly installed at the lower end of the rotating rod 450, and a gear 470 is fixedly installed at the upper end of the rotating rod 450. When the steam flows in the vertical section of the air guide pipe 430, it will drive the rotating rod 450 to rotate through the impeller 460.

[0027] The drive device 500 consists of a drive shaft 510, a second gear 520, and a drive gear 530. The drive shaft 510 is rotatably mounted on the top of the housing 100. The second gear 520 is fixedly mounted on the upper end of the drive shaft 510 and can mesh with the first gear 470 on the steam generating device 400. The drive gear 530 is fixedly mounted on the lower end of the drive shaft 510 and can mesh with the toothed 310 on the dust filter belt 300. When the first gear 470 rotates under the action of steam, the second gear 520 will drive the drive gear 530 to rotate, thereby driving the dust filter belt 300 to rotate.

[0028] The drive device 500 consists of a drive shaft 510, a second gear 520, and a drive gear 530. The drive shaft 510 is rotatably mounted on the top of the housing 100. The second gear 520 is fixedly mounted on the upper end of the drive shaft 510 and can mesh with the first gear 470 on the steam generating device 400. The drive gear 530 is fixedly mounted on the lower end of the drive shaft 510 and can mesh with the toothed 310 on the dust filter belt 300. When the first gear 470 rotates under the action of steam, the second gear 520 will drive the drive gear 530 to rotate, thereby driving the dust filter belt 300 to rotate.

[0029] The water storage tank 600 is a semi-circular box. The water storage tank 600 is fixedly installed on the box body 100 opposite the dust collection box 200. The upper end of the water storage tank 600 is provided with a water inlet pipe 610 for adding water, and the lower end of the water storage tank 600 is provided with a water outlet pipe 620 for draining water. A water pressure valve 630 is provided at the connection between the water outlet pipe 620 and the water storage tank 600. The water pressure valve 630 is a valve controlled by liquid pressure. When the water pressure inside the water outlet pipe 620 decreases, the water pressure valve 630 will open, and the water in the water storage tank 600 will enter the water outlet pipe 620 through the water pressure valve 630. The other end of the water outlet pipe 620 is connected to the bottom of the spiral heat transfer pipe 410 on the steam generating device 400, and the water in the water outlet pipe 620 can enter the spiral heat transfer pipe 410.

[0030] Working principle of this invention:

[0031] The flue gas discharged from the suspension preheater enters the housing 100 through the inlet pipe 110. As the flue gas passes through the dust filter belt 300, dust and particulate matter in the flue gas are trapped inside the filter belt 300. The cleaned flue gas is then discharged through the outlet pipe 120. During the process of the high-temperature flue gas passing through the housing 100, the high-temperature flue gas heats the water inside the spiral heat transfer tube 410. When water vapor is generated inside the spiral heat transfer tube 410, the water vapor is trapped inside the steam box 420. As more and more steam is generated, the pressure inside the steam box 420 gradually increases. When the steam pressure reaches a threshold, the pressure valve 440 will open, and the high-pressure steam inside the steam box 420 will pass through the pressure valve 440. The high-speed, high-pressure steam enters the air duct 430 and is finally sprayed through the jet nozzle 431 onto the dust filter belt 300 directly in front of the jet nozzle 431. The high-speed, high-pressure steam will carry away the dust adhering to the dust filter belt 300. After the dust leaves the dust filter belt 300, it will enter the dust collection box 200 for collection with the airflow. At the same time, when the high-pressure steam passes through the vertical section of the air duct 430, the airflow will drive the rotating rod 450 to rotate due to the presence of the impeller 460. When the rotating rod 450 rotates, it will drive the gear 2 520 to rotate through the gear 1 470. The gear 2 520 will drive the dust filter belt 300 to rotate through the drive gear 530. Since the dust filter belt 300 is constantly rotating, the dust filter belt 300 can achieve continuous dust removal.

Claims

1. A dust removal device for exhaust gas from a rotary jet cyclone preheater, comprising a housing (100), a dust collection box (200), a dust filter belt (300), a steam generating device (400), a driving device (500), and a water storage tank (600); characterized in that: The housing (100) is symmetrically equipped with an air inlet pipe (110) and an air outlet pipe (120) at both the front and rear ends; a dust collection box (200) is provided at the right end of the housing (100); a dust filter belt (300) is rotatably installed inside the housing (100); the steam generating device (400) consists of a spiral heat transfer pipe (410), a steam box (420), a guide pipe (430), a gas pressure valve (440), an impeller (460), and a rotating rod (450); the steam box (420) is located in the middle of the spiral heat transfer pipe (410); A duct (430) is provided on one side of the top of the steam box (420). The vertical section of the duct (430) is provided with multiple jet holes (431). The jet holes (431) can spray the high-pressure steam in the duct (430) onto the inner surface of the dust filter belt (300). The upper end of the dust filter belt (300) is provided with a toothed belt (310). The drive gear (530) meshes with the toothed belt (310) on the dust filter belt (300). A rotating rod (450) is rotatably installed in the vertical section of the duct (430). The lower end of the rotating rod (450) is fixedly installed. The device is equipped with an impeller (460), and a gear 1 (470) is fixedly installed on the upper end of the rotating rod (450); the drive device (500) consists of a drive shaft (510), a gear 2 (520), and a drive gear (530); the drive shaft (510) is rotatably mounted on the top of the housing (100); a gear 2 (520) is fixedly installed on the upper end of the drive shaft (510), and the gear 2 (520) meshes with the gear 1 (470) on the steam generating device (400); a drive gear (470) is fixedly installed on the lower end of the drive shaft (510). 530); The water storage tank (600) is a semi-circular box body, and the water storage tank (600) is fixedly installed on the opposite side of the dust collection box (200) on the box body (100); the upper end of the water storage tank (600) is provided with a water inlet pipe (610) for adding water, and the lower end of the water storage tank (600) is provided with a water outlet pipe (620) for draining water. The other end of the water outlet pipe (620) is connected to the bottom of the spiral heat transfer pipe (410) on the steam generating device (400), and the water in the water outlet pipe (620) can enter the spiral heat transfer pipe (410).

2. The exhaust gas dust cleaning device for a rotary jet cyclone preheater according to claim 1, characterized in that: The steam box (420) is connected to the spiral heat transfer tube (410).

3. The exhaust gas dust cleaning device for a rotary jet cyclone preheater according to claim 1, characterized in that: One end of the horizontal section of the air guide pipe (430) is connected to the steam box (420), and a gas pressure valve (440) is provided at the connection with the steam box (420).

4. The exhaust gas dust cleaning device for a rotary jet cyclone preheater according to claim 1, characterized in that: A water pressure valve (630) is provided at the connection between the water outlet pipe (620) and the water storage tank (600).

5. The exhaust gas dust cleaning device for a rotary jet cyclone preheater according to claim 1, characterized in that: The spiral heat transfer tube (410) consists of two spiral tubes that are connected vertically.

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