Waste heat recovery system for tail chute of sintering machine

Abstract

The utility model relates to a sintering machine tail chute waste heat recovery system which structurally comprises a trolley conveying device, a crusher arranged at the tail end of the trolley conveying device, a tail chute arranged at the tail end of the trolley conveying device and below the crusher, and a waste heat recovery water tank arranged below the tail chute. The waste heat recovery water tank is communicated with a water inlet pipe, and the waste heat recovery water tank is communicated with a sintering raw material mixer of a mixing workshop through a water outlet pipe. Sensible heat of sintering ore is recycled to the maximum extent, normal-temperature water is heated into hot water, the hot water is conveyed to a sintering raw material mixer of a sintering mixing workshop to be added into raw materials, the temperature of the sintering raw materials is increased, fuel consumption of sintering production is reduced, the quality of sintered ore is improved, the environment temperature of a tail chute is improved, and the service life of the sintering ore is prolonged. And energy wasted in sintering production is recycled.

Description

Technical Field

[0001] The utility model relates to a sintering machine, in particular to a waste heat recovery system of a tail chute of a sintering machine. Background Art

[0002] The steel industry mainly uses blast furnaces for ironmaking. The blast furnace charge is mainly sintered ore with a certain proportion of pelletized ore and lump ore added. The proportion of sintered ore in the charge exceeds 70%, so the sintering process is an indispensable part of the steel industry.

[0003] During the sintering process, the hot sinter cake is unloaded from the tail of the sintering machine, crushed to less than 150mm by a single roller crusher, and then transported to the ring cooler through the tail chute to cool it. After cooling, it becomes a transportable sintered ore. The temperature of the sintered ore is as high as 800℃ before entering the ring cooler, causing the temperature of the tail chute to be about 400℃.

[0004] Due to heat conduction, the tail chute itself has a temperature of about 400°C, but this part of the heat is not effectively recovered. In sintering production, there are still a lot of places where heat is needed. For example, sintering raw materials need heat to increase the material temperature to improve the quality of sintered ore and reduce fuel consumption.

[0005] When the temperature of the sintering raw materials is low, water vapor condenses in the material layer, forming an over-humidification phenomenon, which makes the air permeability of the sintering material layer worse; if the raw material temperature is increased to a dew point temperature of more than 60°C, the condensation of water vapor in the material layer can be significantly reduced or eliminated, the resistance of the over-humidified layer to the air flow can be reduced, and the air permeability of the material layer can be improved. When the raw materials are sintered on the sintering machine, the amount of air drawn through the material layer increases, creating good conditions for heat exchange in the material layer, accelerating the combustion speed and reducing fuel consumption.

[0006] At present, adding hot water to the raw materials is one of the means to increase the temperature of the raw materials. The hot water added to the raw materials is provided by the hot water tank of the hot water pump station. The hot water tank is heated by steam. The water temperature after heating is 80℃ and is used in the mixing workshop. The steam is generated from the waste heat boiler of the sintering plant's ring cooler. The generated steam should be used for power generation. However, the hot water pump station consumes 5% of the steam produced by the waste heat boiler to produce hot water, which reduces the power generation by about 5%, which is very unfavorable to reducing the energy consumption of sintering. Utility Model Content

[0007] The utility model aims to provide a waste heat recovery device for a tail chute of a sintering machine, so as to solve the problem of waste of sintering waste heat in the existing sintering production process.

[0008] The utility model is implemented as follows: a sintering machine tail chute waste heat recovery system includes a trolley conveying device, a crusher is arranged at the end of the trolley conveying device, a machine tail chute is arranged at the end of the trolley conveying device and below the crusher, a waste heat recovery water tank is arranged below the machine tail chute, a water inlet pipe is connected to the waste heat recovery water tank, and the waste heat recovery water tank is connected to the sintering raw material mixer in the mixing workshop through a water outlet pipe.

[0009] As a further improvement of the sintering machine tail chute waste heat recovery system of the utility model, the waste heat recovery water tank includes a hopper with a bucket-shaped structure, and a jacket is arranged on the outer wall of the hopper, and the jacket is used to hold water.

[0010] As a further improvement of the waste heat recovery system of the tail chute of the sintering machine of the utility model, a first valve is arranged on the water inlet pipe, and a second valve is arranged on the water outlet pipe.

[0011] As a further improvement of the waste heat recovery system of the sintering machine tail chute of the utility model, a sewage pipe is connected to the bottom of the waste heat recovery water tank, and a sewage valve is arranged on the sewage pipe.

[0012] As a further improvement of the sintering machine tail chute waste heat recovery system of the utility model, the water inlet pipe is connected to the lower part of the waste heat recovery water tank, and the water outlet pipe is connected to the upper part of the waste heat recovery water tank.

[0013] As a further improvement of the waste heat recovery system of the sintering machine tail chute of the utility model, there are two tail chutes, and the two tail chutes correspond to the end of the trolley conveying device and the crusher respectively.

[0014] As a further improvement of the waste heat recovery system of the tail chute of a sintering machine of the utility model, the end of the water outlet pipe extends into the sintering raw material mixer, and a plurality of nozzles are arranged on the end of the water outlet pipe.

[0015] As a further improvement of the waste heat recovery system of the sintering machine tail chute of the utility model, a sintered ore discharge port is provided at the bottom of the waste heat recovery water tank, and the sintered ore discharge port is connected to the ring cooler.

[0016] The utility model arranges a waste heat recovery water tank on the tail chute of the machine to recover the heat of the sintered ore, generate hot water and reduce the ambient temperature.

[0017] At the same time, using the hot water generated by the waste heat recovery device to heat the sintering raw materials and increase the temperature of the sintering raw materials helps to reduce the over-humidification phenomenon caused by condensation of water vapor in the sintering material layer, effectively reduce the thickness of the over-humidification layer and the resistance of the over-humidification layer to the air flow, improve the permeability of the material layer, improve the quality of sintered ore and reduce fuel consumption.

[0018] During the transfer of hot sintered ore through the tail chute, the waste heat recovery water tank absorbs part of the heat, reducing the cooling load of the ring cooler in the next process, improving the cooling effect, and reducing the cooling area of ​​the original ring cooler, thereby reducing construction investment.

[0019] Using the waste heat recovery water tank at the end of the sintering machine to generate hot water can save steam consumption, increase power generation and reduce fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model.

[0021] Figure 2 It is a structural diagram of the tail chute of the utility model.

[0022] In the figure: 1. Trolley conveying device; 2. Crusher; 3. Tail chute; 4. Waste heat recovery water tank; 5. Annular cooler; 6. Sintering raw material mixer; 7. Water inlet pipe; 8. Water outlet pipe; 9. First valve; 10. Second valve; 11. Drain pipe; 12. Drain valve; 4-1. Feed hopper; 4-2. Jacket. DETAILED DESCRIPTION

[0023] The utility model will be further described below in conjunction with the accompanying drawings.

[0024] like Figure 1 , Figure 2 As shown, the utility model is a waste heat recovery system for a sintering machine tail chute 3, comprising a trolley conveying device 1, a crusher 2 is arranged at the end of the trolley conveying device 1, a machine tail chute 3 is arranged at the end of the trolley conveying device 1 and below the crusher 2, a waste heat recovery water tank 4 is arranged below the tail chute 3, a water inlet pipe 7 is connected to the waste heat recovery water tank 4, and the waste heat recovery water tank 4 is connected to the sintering raw material mixer 6 of the mixing workshop through a water outlet pipe 8.

[0025] When the sintering production reaches the tail of the sintering machine, the sintered cake is unloaded from the trolley conveyor 1, crushed to less than 150mm by the crusher 2, and then the sintered ore enters the tail chute 3. After passing through the tail chute 3, the sintered ore enters the waste heat recovery water tank 4, and the normal temperature water exchanges heat with the hot sintered ore in the waste heat recovery water tank 4. The normal temperature water is heated to form hot water, and the hot water enters the sintering raw material mixer 6 in the mixing workshop through the outlet pipe 8, and is used to add water to the sintering raw material mixer 6, thereby increasing the temperature of the sintering raw material, which can significantly reduce or eliminate the condensation of water vapor in the material layer, reduce the resistance of the over-humidified layer to the air flow, and improve the air permeability of the material layer. When the raw material is sintered on the sintering machine, the amount of air drawn through the material layer increases, creating good conditions for heat exchange in the material layer, accelerating the combustion speed, and reducing fuel consumption. It also reduces the amount of hot water heated by steam, reduces the steam required for hot water production by the hot water pump station, and saves steam for power generation, which can increase power generation. At the same time, the temperature of the tail chute 3 can be lowered to reduce the temperature of the surrounding environment.

[0026] As a further improvement of the waste heat recovery system of the sintering machine tail chute 3 of the utility model, the waste heat recovery water tank 4 includes a hopper 4-1 of a bucket-shaped structure, and a jacket 4-2 is arranged on the outer wall of the hopper 4-1, and the jacket 4-2 is used to hold water. The water inlet pipe 7 and the water outlet pipe 8 are both connected to the jacket 4-2, and new water is transported into the jacket 4-2 through the water inlet pipe 7. When the hot sintered ore passes through the hopper 4-1, the side wall of the hopper 4-1 is heated. After the water enters the jacket 4-2, it takes away the heat of the side wall of the hopper 4-1, thereby realizing the heat exchange between the sintered ore and the water.

[0027] A first valve 9 is provided on the water inlet pipe 7, and a second valve 10 is provided on the water outlet pipe 8. The openings of the first valve 9 and the second valve 10 are adjusted according to the amount of hot water required by the sintering raw material mixer 6 and the ambient temperature of the tail chute 3. When the waste heat recovery water tank 4 cannot provide enough hot water, the existing hot water pump station provides hot water for supplementation to maintain the raw material temperature to a dew point temperature above 55°C.

[0028] As a further improvement of the waste heat recovery system of the sintering machine tail chute 3 of the utility model, a sewage pipe 11 is connected to the bottom of the waste heat recovery water tank 4, and a sewage valve 12 is arranged on the sewage pipe 11. The waste heat recovery water tank 4 can be discharged regularly. When discharging sewage, it is only necessary to close the second valve 10 and open the first valve 9 and the sewage valve 12, and the dirt in the waste heat recovery water tank 4 is taken out by water flow. The operation is simple and can prevent the scale of the water tank from affecting production.

[0029] As a further improvement of the waste heat recovery system of the sintering machine tail chute 3 of the utility model, the water inlet pipe 7 is connected to the lower part of the waste heat recovery water tank 4, and the water outlet pipe 8 is connected to the upper part of the waste heat recovery water tank 4. Normal temperature water enters from the bottom and exits from the top, and the normal temperature water exchanges heat with the hot sintered ore through the waste heat recovery water tank 4, thereby improving the heat exchange efficiency.

[0030] There are two tail chutes 3, and the two tail chutes 3 correspond to the end of the trolley conveyor 1 and the crusher 2 respectively. The bulk material after the trolley of the trolley conveyor 1 is turned over and the sintered ore after being crushed by the crusher 2 is collected into the waste heat recovery water tank 4 through the tail chute 3.

[0031] Among them, the crusher 2 is a single-roll crusher 2.

[0032] As a further improvement of the waste heat recovery system of the sintering machine tail chute 3 of the utility model, the end of the water outlet pipe 8 extends into the sintering raw material mixer 6, and a plurality of nozzles are arranged on the end of the water outlet pipe 8, through which hot water is evenly sprayed into the sintering raw materials.

[0033] A sinter discharge port is provided at the bottom of the waste heat recovery water tank 4, and the sinter discharge port is connected to the ring cooler 5. The hot sintered ore enters the ring cooler 5 through the waste heat recovery water tank 4 and is cooled to below 120°C, becoming a transportable finished sintered ore. During the transportation process, the hot sintered ore exchanges heat with normal temperature water, which reduces the temperature, reduces the cooling load of the ring cooler 5, and improves the cooling effect. The cooling area of ​​the ring cooler 5 can be reduced by 4%.

[0034] The utility model recycles the sensible heat of sintered ore to the maximum extent, heats room temperature water into hot water, and transports the hot water to the sintering raw material mixer 6 in the sintering mixing workshop to be added to the raw materials, thereby increasing the temperature of the sintering raw materials, reducing the fuel consumption of the sintering production and improving the quality of the sintered ore, thereby improving the environmental temperature of the tail chute 3 and recycles the energy wasted in the sintering production.

Claims

1. A sintering machine tail chute waste heat recovery system, characterized in that: It includes a trolley conveying device, at the end of which a crusher is arranged, a tail chute is arranged at the end of the trolley conveying device and below the crusher, a waste heat recovery water tank is arranged below the tail chute, and a water inlet pipe is connected to the waste heat recovery water tank, which is connected to the sintering raw material mixer in the mixing workshop through a water outlet pipe.

2. The sintering machine tail chute waste heat recovery system according to claim 1, characterized in that: The waste heat recovery water tank comprises a hopper of a bucket-shaped structure, and a jacket is arranged on the outer wall of the hopper, and the jacket is used to hold water.

3. The sintering machine tail chute waste heat recovery system according to claim 1, characterized in that: A first valve is arranged on the water inlet pipe, and a second valve is arranged on the water outlet pipe.

4. The sintering machine tail chute waste heat recovery system according to claim 1, characterized in that: A sewage pipe is connected to the bottom of the waste heat recovery water tank, and a sewage valve is arranged on the sewage pipe.

5. The sintering machine tail chute waste heat recovery system according to claim 1, characterized in that: The water inlet pipe is communicated with the lower part of the waste heat recovery water tank, and the water outlet pipe is communicated with the upper part of the waste heat recovery water tank.

6. The sintering machine tail chute waste heat recovery system according to claim 1, characterized in that: There are two tail chutes in total, and the two tail chutes correspond to the end of the trolley conveying device and the crusher respectively.

7. The sintering machine tail chute waste heat recovery system according to claim 1, characterized in that: The end of the water outlet pipe extends into the sintering raw material mixer, and a plurality of nozzles are arranged on the end of the water outlet pipe.

8. The sintering machine tail chute waste heat recovery system according to claim 1, characterized in that: A sintered ore discharge port is provided at the bottom of the waste heat recovery water tank, and the sintered ore discharge port is connected to the ring cooler.

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