CN117029373A - High Wen Zhaliao cooling and heat energy recycling method and device - Google Patents

Abstract

The invention relates to a method and device for cooling high-temperature slag and recycling heat energy. The method for cooling high-temperature slag and recycling heat includes the following steps: S1. Indirect exchange of high-temperature slag and cooling water under air-isolated conditions. Heat to obtain the first slag material, flash evaporate the heat-exchanged cooling water to obtain saturated steam; S2. Perform air-cooling heat exchange on the first slag material obtained in step S1 to obtain the second slag material and the heat-exchanged cooling water. The wind; S3, spray and cool down the second slag material obtained in step S2 and then send it to the slag bin, and recycle the hot air. The invention can avoid secondary combustion of high-temperature slag materials during the cooling process. It adopts a heat exchange method that combines indirect heat exchange with cooling water and air-cooling heat exchange. It has high heat exchange efficiency and reduces the consumption of cooling water. After heat exchange, The cooling water and hot air are recycled to achieve the purpose of energy saving and emission reduction.

Description

A method and device for cooling high-temperature slag and recycling heat energy

Technical field

The present invention relates to the technical field of high-temperature slag cooling and waste heat recovery and utilization, and in particular to a method and device for high-temperature slag cooling and heat energy recovery and utilization.

Background technique

There are large amounts of high-temperature slag in non-ferrous metallurgy, steel, building materials and other industries. At present, most of the process solutions for cooling high-temperature slag materials are: (1) direct cold water quenching process. First of all, this process uses cold water in direct contact with high-temperature slag materials, resulting in unorganized water vapor emissions on site and serious white pollution; secondly, a large amount of wastewater will be produced, and the environmental protection costs for sewage treatment in enterprises are high; most importantly, the temperature of high-temperature slag materials is mostly 1000°C Above, a large amount of heat is wasted, which is contrary to the national energy and environmental protection policy; in addition, the high-temperature slag contains matte, which will explode and splash when in direct contact with water, causing safety accidents. (2) Use slag cooler technology. This method uses cold water to indirectly exchange heat with the slag material. The temperature of the slag material decreases and the heat is transferred to the cold water. This method has relatively low working fluid side pressure and temperature parameters, and low energy utilization efficiency.

Chinese utility model patent CN203963960U discloses a water-cooled wall-type material cooler. The equipment includes a water-cooled wall-type rotating cylinder. A slag feeding device is installed at the front end of the rotating cylinder, and a slag discharge device is installed at the rear end. The rotating cylinder is water-cooled. Wall structure, the water-cooling wall has multiple baffles arranged in a spiral shape; in order to increase the heat exchange area, fins are also installed on the water-cooling wall, and the front and rear ends are connected to the front annular header and the rear annular header respectively; An inlet jellyfish pipe and an outlet jellyfish pipe are also installed on the axis of the rotating cylinder. The inlet jellyfish pipe is sleeved outside the outlet jellyfish pipe. The inlet jellyfish pipe and the outlet jellyfish pipe are connected to the water inlet and outlet device; the outlet jellyfish pipe is connected to The front part of the rotating cylinder is connected to the front annular header through the water outlet elbow; the rear annular header is connected to the jellyfish inlet pipe through the water distribution pipe. The equipment cools the material and also recycles the heat of the high-temperature material, reducing heat energy loss. However, cooling high-temperature slag with a temperature above 1000°C to below 100°C requires a large amount of cooling water, resulting in a waste of water resources. In addition, during the process of transferring high-temperature slag material to the cooler, the high-temperature slag material is often in a molten or softened state, which easily forms sticky spots and sticks to the conveying channel. In addition, high-temperature slag usually contains incompletely burned coal or coke. For high-temperature slag with combustible components, how to prevent secondary combustion of high-temperature slag during the cooling process is also an urgent problem that needs to be solved by existing technology.

Contents of the invention

In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method for cooling high-temperature slag and recycling heat energy, which avoids secondary combustion of high-temperature slag during the cooling process, efficiently recycles heat energy, and saves water at the same time.

In order to solve the above technical problems, the technical solutions of the present invention are as follows:

A method for cooling high-temperature slag and recycling heat energy, including the following steps:

S1. Perform indirect heat exchange between high-temperature slag and cooling water under air-isolated conditions to obtain the first slag, and perform a flash evaporation operation on the heat-exchanged cooling water to obtain saturated steam;

S2. Perform air-cooling and heat exchange on the first slag obtained in step S1 to obtain the second slag and the heat-exchanged hot air;

S3. Spray and cool down the second slag material obtained in step S2, then send it to the slag bin, and recycle the hot air.

In this way, the high-temperature slag material and the cooling water are first indirectly heat-exchanged under the condition of isolating the air. The high-temperature slag material is cooled while avoiding the secondary combustion of the high-temperature slag material. After the heat exchange, the temperature of the cooling water is increased, and the temperature of the cooling water is increased through flash. The steaming operation turns the cooling water after heat exchange into saturated steam and recycles the heat energy; the temperature of the high-temperature slag is greatly reduced after indirect heat exchange, and then the first slag is air-cooled and heat exchanged. When the first slag is cooled down, At the same time, a large amount of hot air is obtained and recycled to achieve the purpose of energy conservation and emission reduction, and save water; the slag is further cooled through the spray device to avoid spontaneous combustion reactions caused by long-term accumulation of slag in the slag bin.

Further, the cooling water described in step S1 is desalted and deoxygenated water, and the temperature of the cooling water is 90-95°C; the temperature of the cooling water described in step S1 reaches 150-170°C after heat exchange, and the obtained product after flash evaporation The saturated vapor pressure is 3-5 kg pressure. In this way, it is convenient to perform flash evaporation operation after heat exchange of cooling water. In addition, the steam parameters can be adjusted according to the demand for steam and the steam pipe network. The cooling temperature of the slag material at the water-cooling outlet can be adjusted according to the different demands for steam parameters and steam consumption.

Further, the high-temperature slag material includes non-ferrous metal smelting slag and steel smelting slag. In some embodiments of the present invention, the high-temperature slag mainly contains various combinations of carbon, zinc, silicon, iron, copper, sulfur, sulfur, calcium, and magnesium, resulting in great differences in the physical parameters of the slag. , therefore, the elemental composition and proportion of high-temperature slag obtained from different non-ferrous metallurgy and steel smelting processes are different, resulting in different melting points and softening points of high-temperature slag. Combined with the different needs for steam parameters and steam consumption, the first slag is adjusted The cooling temperature of the material.

Further, the temperature of the first slag material is 500-700°C, and the temperature of the second slag material is below 100°C. Since high-temperature slag materials usually contain matte components, matte is in a semi-molten state at 800-900°C, has high viscosity and is easy to hang on the wall. In order to achieve long-term safe and stable operation of the equipment, the temperature of the first slag material at the outlet of the water-cooled cylinder is controlled at 500-700℃, which is lower than the softening temperature of the slag, and the viscosity of the slag is greatly reduced, which is beneficial to subsequent air-cooling heat exchange. At the same time, the temperature of the first slag material is basically lower than the conditions for the temperature to reach the ignition point among the three elements of combustion, which can avoid secondary combustion of the slag material due to the entry of oxygen in the air during the subsequent air-cooling heat exchange process. It is conducive to the safe and stable performance of subsequent air-cooled heat exchange.

Further, the hot air is sent to the non-ferrous metal smelting or steel smelting process. In some embodiments of the present invention, the hot air formed after heat exchange is sent through a pipeline into the leaching slag volatilization kiln in the leaching slag zinc smelting process, and participates in the combustion process of slag and fuel. Due to the increase in air temperature, it can reduce The amount of anthracite or coke used when the physical and chemical reaction of the leaching residue material occurs, the physical and chemical reaction of the slag material and the fuel proceeds more fully, which is conducive to energy saving and emission reduction.

Further, during the air cooling heat exchange process in step S2, the temperature of the cold air is 20-30°C, the temperature of the hot air after heat exchange is above 200°C, and the flow rate of the cold air is 20000m ³ -35000 m ³ / hour, which is the same as the main process. The air volume matches. In this way, the flow rate of the cold air is too small and the heat exchange efficiency is low. If the flow rate of the cold air is too large, not only will a small amount of slag be brought into the hot air duct, but it will also cause the temperature of the hot air to decrease, which is not conducive to the subsequent use of the hot air.

Furthermore, the temperature of the high-temperature slag after indirect heat exchange is adjusted according to the different hot air requirements for the softening temperature of the high-temperature slag and the raw material and fuel reactions of non-ferrous metal smelting or steel smelting main process equipment, so that the heat energy can be fully recovered and utilized.

A device for implementing the above-mentioned high-temperature slag cooling and heat energy recycling method, including a chute, a water-cooling cylinder, and an air-cooling cylinder. The outer wall of the chute is provided with a water-cooling jacket; the water-cooling cylinder is provided with a number of cooling water channels. One end of the cylinder is provided with a first feed pipe and a seal, and the other end is provided with a first discharge pipe. The chute is sealingly connected to the first feed pipe; one end of the air-cooled cylinder is provided with a second feed pipe. The other end of the feed pipe and the air outlet is provided with a second feed pipe and an air inlet. The second feed pipe is connected to the first feed pipe. A belt conveyor system is provided below the second feed pipe. The belt conveyor system is provided with a spray device; the water-cooled cylinder is provided with a first feed pipe and one end of the cylinder is provided with a feeding air interface; the water-cooled cylinder and the air-cooled cylinder are both provided with rotating components.

In this way, when the high-temperature slag is transferred into the water-cooled cylinder through the chute, it suddenly cools down after contacting the water-cooled wall surface of the water-cooling jacket, preventing the high-temperature slag from hanging on the wall and sticking to the conveying channel; the rotating assembly can rotate the water-cooled cylinder, making the high-temperature slag After the slag material enters the water-cooled cylinder from the first feed pipe, it moves toward the first discharge pipe as the water-cooled cylinder rotates. The high-temperature slag material exchanges heat with the cooling water circuit while moving in the water-cooled cylinder. During the heat exchange process The hot water generated can be recycled; then the high-temperature slag material is discharged from the first discharge pipe and enters the air-cooled cylinder through the second feed pipe. The rotating assembly can rotate the air-cooled cylinder so that the high-temperature material flows to the second discharge pipe. The tube moves in the direction, and at the same time, cold air enters from the air inlet to exchange heat for high-temperature materials. The hot air generated during the heat exchange process is discharged from the air outlet for recycling; inert gas is introduced into the water-cooled cylinder through the feed air interface and discharged from the water-cooled cylinder. The sealing member can seal the first discharge pipe and the water-cooling cylinder to prevent air from entering the water-cooling cylinder through the gap between the first discharge pipe and the water-cooling cylinder, and the high-temperature slag material in the chute is also It can prevent air from entering the water-cooled cylinder through the chute, so that high-temperature slag materials can avoid secondary combustion during the cooling process of the water-cooled cylinder; the cooled materials in the air-cooled cylinder are discharged from the second discharge pipe and passed through the belt conveyor system After being sent to the slag bin, the spray device can further cool the slag to avoid spontaneous combustion reactions caused by long-term accumulation of the slag.

Further, a plurality of first spiral sheets are spirally arranged on the inner wall of the water-cooled cylinder along the axis of the water-cooled cylinder, and a plurality of first slag pockets are arranged between adjacent first spiral sheets. The first slag pockets are Arranged perpendicularly to the first spiral sheet; a number of third spiral sheets are spirally arranged in the air-cooling cylinder along the axis of the air-cooling cylinder, and a number of third slag pockets are arranged between adjacent third spiral sheets, so The third slag pocket piece and the third spiral piece are arranged vertically. In this way, the first spiral piece and the third spiral piece have a flow guiding function, and the first slag pocket piece and the third slag pocket piece have a slag lifting function. Through the rotation of the water-cooled cylinder and the flow diversion of the first spiral piece, the high-temperature slag is removed. The material is pushed from the first feed pipe of the water-cooled cylinder to the first discharge pipe; through the rotation of the air-cooled cylinder and the diversion of the third spiral blade, the second slag material is pushed from the second feed pipe of the air-cooled cylinder. to the second discharge pipe. In addition, through the slag lifting function of the third spiral blade and the third slag pocket, the first slag material is fully contacted with the cold air, ensuring sufficient heat exchange area and heat exchange time, and improving heat exchange efficiency.

Further, the cooling water path includes a first water path and a second water path. The first water path is spirally arranged on the first spiral sheet along the axis of the water-cooling cylinder. The second water path is provided on the outer wall of the water-cooling cylinder. Above; a plurality of second spiral sheets are provided on the first waterway, and a plurality of second slag pocket sheets are arranged between adjacent second spiral sheets, and the second slag pocket sheets are arranged perpendicularly to the second spiral sheets. In this way, using spiral water pipes as heat exchange surfaces can increase the heat exchange area.

Further, an annular water chamber is provided at one end of the water-cooled cylinder away from the first feed pipe, a conversion joint is provided on the annular water chamber, and a water inlet and a water return port are provided on the conversion joint; the annular water chamber There is an inner ring water chamber and an outer ring water chamber indoors; one end of the inner ring water chamber is connected to the first waterway, and the other end is connected to the water return port; one end of the outer ring water chamber is connected to the second waterway, and the other end is connected to the second waterway. It is connected with the water inlet; the water-cooling cylinder is provided with a water chamber at one end of the first feed pipe, and the water chamber is connected with the first water path and the second water path.

Further, a water chamber is provided on the inner wall of one end of the water-cooled cylinder provided with the first feed pipe, and the water chamber is connected to the first water channel and the second water channel. In this way, the cooling water enters the water chamber through the first water path, is distributed in the water chamber, and then enters the second water path.

Further, a first refractory castable layer is provided on the inner wall of one end of the water-cooled cylinder provided with the first feed pipe. In this way, damage to the inner wall of the water-cooled cylinder caused by the high temperature generated after the high-temperature slag material enters the water-cooled cylinder from the first feed pipe is avoided.

Further, the air-cooled cylinder is provided with a high-temperature-resistant layer on the inner wall of one end of the second feed pipe. The high-temperature-resistant layer is a plastic casting layer and a second refractory castable layer along the radial direction of the air-cooled cylinder. , aluminum silicate fiber felt layer. In this way, damage to the inner wall of the air-cooled cylinder caused by the high temperature generated after the high-temperature slag material enters the air-cooled cylinder from the second feed pipe is avoided.

In some embodiments of the present invention, inert gas is introduced into the water-cooled cylinder through the feed air interface. When materials appear to stick, feed air (inert gas) is introduced through the feeding air interface to prevent slag from clogging the channel. In addition, the feeding air can discharge the air in the water-cooled cylinder, creating an oxygen-free environment in the water-cooled cylinder, and preventing secondary combustion of high-temperature materials in the water-cooled cylinder.

Further, the rotating assembly includes a first rotating assembly arranged on the water-cooling cylinder and a second rotating assembly arranged on the air-cooling cylinder. The first rotating component is a transmission device in the prior art. The first rotating component includes a first motor and a first reducer. A first sprocket is provided on the first reducer, and a second sprocket is provided in the middle of the water-cooled cylinder. The sprocket, the first motor is connected to the first reducer, and drives the barrel of the water-cooled cylinder to rotate through the chain drive. In addition, support retaining rings are provided at both ends of the water-cooling cylinder, and the support retaining rings are rollingly connected to the water-cooling cylinder base through rotating wheels.

Further, the second rotating component is a transmission device known in the prior art, including a second motor, a second reducer, a third sprocket, and an air-cooled cylindrical sprocket. The air-cooled cylindrical sprocket Set on the barrel of the air-cooled cylinder, the second motor drives the second reducer to rotate through a belt, the output shaft end of the second reducer drives the third sprocket to rotate through the coupling, and the third sprocket passes through the transmission chain. The air-cooled cylinder sprocket is driven to rotate, thereby realizing the rotation of the air-cooled cylinder through the chain drive.

Further, the air-cooled cylinder is rollingly connected to the air-cooled cylinder support base through an air-cooled cylinder rotating wheel.

Compared with the prior art, the beneficial effects of the present invention are as follows:

(1) The present invention cools the high-temperature slag in the water-cooled cylinder in an oxygen-free environment through the seal and the feeding air interface, which can avoid secondary combustion of the high-temperature slag, thereby avoiding an increase in the emission of pollutants and without increasing the environmental protection of the original process. Facility load.

(2) In the present invention, a water-cooling jacket is provided on the chute, so that when the high-temperature slag material is transferred into the water-cooled cylinder through the chute, it contacts the water-cooled wall of the water-cooling jacket and suddenly cools down, and the high-temperature slag material on the wall is separated from the bonding condition, thereby preventing hanging wall phenomenon.

(3) The present invention adopts a heat exchange method that combines water-cooled cylinders and air-cooled cylinders, which has high heat exchange efficiency and achieves the purpose of energy saving and emission reduction. It also reduces the consumption of cooling water and saves water.

(4) In the present invention, the cooling water and hot air after heat exchange are recycled, and the high-temperature slag heat recovery and utilization rate is high.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is an enlarged structural schematic diagram of A in Figure 1;

Figure 3 is an enlarged structural schematic diagram of position B in Figure 1;

Figure 4 is an enlarged structural schematic diagram of position C in Figure 1;

Figure 5 is a schematic structural diagram of the water-cooled cylinder of the present invention;

Figure 6 is a schematic structural diagram of the G-G cross-section in Figure 5;

Figure 7 is a schematic structural diagram of the H-H cross-section in Figure 5;

Figure 8 is a schematic diagram of the D-D cross-sectional structure in Figure 1;

Figure 9 is a schematic structural diagram of the E-E section in Figure 1;

Figure 10 is a schematic structural diagram of the F-F section in Figure 1 .

Explanation of reference signs: 1 water-cooling jacket slag chute, 101 chute, 102 water-cooling jacket, 2 water-cooling cylinder, 201 feeding air interface, 202 first refractory castable material layer, 203 water-cooling cylinder outer wall, 204 water inlet, 205 water return port , 206 first discharge pipe, 207 first rotating component, 208 first waterway, 209 second waterway, 210 first slag pocket, 211 first spiral piece, 212 water chamber, 213 first feed pipe, 214th Two spiral plates, 215 second slag pocket plate, 216 conversion joint, 217 annular water chamber, 2171 inner ring water chamber, 2172 outer ring water chamber, 218 seals, 3 air-cooled cylinder, 301 air-cooled cylinder outer wall, 302 High temperature resistant layer, 303 air-cooled cylinder sprocket, 304 second feed pipe, 305 air outlet, 306 air inlet, 307 aluminum silicate fiber felt layer, 308 second refractory castable layer, 309 plastic cast layer, 310th 2 discharge pipes, 311 third slag pocket piece, 312 third spiral piece, 313 second rotating component, 314 air-cooled cylinder rotating wheel, 315 air-cooled cylinder support base, 4 spray devices, 5 belt conveyor system; The arrows in Figure 5 indicate the direction of cooling water flow.

Detailed ways

The present invention will be described in detail below with reference to examples. It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

Example

Referring to Figures 1 to 10, a high-temperature slag cooling and heat energy recycling device includes a water-cooled slag chute 1, a water-cooled cylinder 2, an air-cooled cylinder 3, and a belt conveyor system 5. One end of the water-cooled cylinder 2 It is sealingly connected to the water-cooled jacket slag chute 1, and the other end is sealingly connected to the air-cooled cylinder 3 through the slag pipe. The other end of the air-cooled cylinder 3 is connected to a belt conveyor system 5, and the belt conveyor system 5 is provided with There is a sprinkler device 4.

The water-cooling jacket slag chute 1 includes a chute 101 and a water-cooling jacket 102 arranged on the outer wall of the chute 101.

One end of the water-cooled cylinder 2 is provided with a first feed pipe 213 connected to the slag drop port of the water-cooled jacket slag drop chute 1, and the other end of the water-cooled cylinder 2 is provided with a first outlet connected to the air-cooled cylinder 3. The material tube 206 and the outer wall 203 of the water-cooled cylinder 2 are provided with a first rotating component 207. The first rotating component 207 includes a first motor and a first reducer. The first reducer is provided with a first sprocket. The water-cooled cylinder is A second sprocket is provided in the middle of the body. The first motor is connected to the first reducer and drives the barrel of the water-cooled cylinder to rotate through chain transmission. In addition, support retaining rings are provided at both ends of the water-cooling cylinder, and the support retaining rings are rollingly connected to the water-cooling cylinder base through rotating wheels.

As shown in FIG. 5 , a first slag pocket piece 210 and a first spiral piece 211 are provided on the inner wall of the water-cooled cylinder 2 . The water-cooled cylinder 2 is provided with an annular water chamber 217 at one end of the first discharge pipe 206. One end of the annular water chamber 217 is connected to a conversion joint 216, and the other end is connected to a number of cooling water channels. The cooling water channels are arranged in on the body of the water-cooled cylinder. The other end of the conversion joint 216 is provided with a water inlet 204 and a water return port 205. The cooling water passage includes a second water passage 209 provided on the outer wall of the water-cooling cylinder 2 and a first water passage 208 spirally provided along the axis of the water-cooling cylinder 2 . The first water channel is a spiral water pipe, and the spiral water pipe is provided with a second spiral piece 214 and a second slag pocket piece 215.

The water-cooling cylinder 2 is provided with a water chamber 212 at one end of the first feed pipe 213. The water chamber 212 is connected to the second water path 209. The cooling water is pressurized by a water pump and enters the annular water chamber 217 through the water inlet 204. , and enters the water chamber 212 through the second water path 209, and then flows from the water chamber 212 into the first water path 208. Finally, the cooling water is heat exchanged and returns to the annular water chamber 217, and is drained from the water return port 205. The annular water chamber 217 is provided with an inner annular water chamber 2171 and an outer annular water chamber 2172; one end of the inner annular water chamber 2171 is connected to the first waterway 208, and the other end is connected to the water return port 205; the outer annular water chamber 2171 is connected to the water return port 205. One end of the chamber 2172 is connected to the second waterway 209, and the other end is connected to the water inlet 204; the water-cooling cylinder 2 is provided with a first feed pipe 213 and a water chamber 212 is provided at one end, and the water chamber 212 is connected to the first waterway. 208 is connected to the second waterway 209.

The water-cooling cylinder 2 is provided with a seal 218 at one end of a first feed pipe 213, and the first feed pipe 213 is sealingly connected to the water-cooling jacket slag chute 1.

The water-cooling cylinder 2 is also provided with a feeding air interface 201. When materials appear to stick, the feeding air is introduced to prevent clogging of the channel. The feeding air is nitrogen.

As shown in FIG. 2 , a first refractory castable layer 202 is provided on the inner wall of the water-cooled cylinder 2 at one end of the cylinder facing the first feed pipe 213 .

The air-cooled cylinder 3 is provided with a second feed pipe 304 and an air outlet 305 at one end, and is provided with a second discharge pipe 310 and an air inlet 306 at the other end.

As shown in Figures 8 and 10, an air-cooled cylinder sprocket 303 is provided on the outer wall 301 of the air-cooled cylinder. The second rotating component 313 is rollingly connected to the air-cooled cylinder sprocket 303 through a transmission chain. Component 313 includes a second motor, a second reducer, and a third sprocket. The second motor drives the second reducer to rotate through a belt. The output shaft end of the second reducer drives the third sprocket to rotate through a coupling. The three sprockets drive the air-cooled cylinder sprocket 303 to rotate through the transmission chain, and the air-cooled cylinder body rotates through the chain transmission. In addition, the air-cooling cylinder is rollingly connected to the air-cooling cylinder support base 315 through the air-cooling cylinder rotating wheel 314.

As shown in Figure 3, the air-cooled cylinder 3 is provided with a high-temperature resistant layer 302 at one end close to the second feed pipe 304. The high-temperature resistant layer 302 includes silicon silicon from the outer wall 301 of the air-cooled cylinder to the interior of the cylinder. Aluminum fiber felt layer 307, second refractory castable material layer 308, plastic castable layer 309.

As shown in FIG. 9 , a third slag pocket piece 311 and a third spiral piece 312 are provided at one end of the air-cooled cylinder 3 near the second discharge pipe 310 .

As shown in FIG. 4 , the high-temperature slag cooling and heat energy recovery and utilization device also includes a spray device 4 , which is arranged above the belt conveyor system 5 . The belt conveyor system 5 is connected to the slag bin, and transfers the spray-cooled slag material into the slag bin.

A method for cooling high-temperature slag and recycling heat energy, which is carried out using the above device and includes the following steps:

S1. Perform indirect heat exchange between high-temperature slag at a temperature of 1000°C and desalted and deoxygenated cooling water at 95°C under air-isolated conditions. The addition amount of high-temperature slag is 20 tons/hour to obtain a temperature of 500°C. For the first slag material, the cooling water temperature after heat exchange is 165°C, and flash evaporation is performed to obtain saturated steam with a steam pressure of 4 kg;

S2. Directly exchange heat between the first slag material and the cold air at 25°C. The input volume of the cold air is 20000m ³ /hour, so that the temperature of the second slag material drops below 100°C. After the cold air heat exchange, the temperature of the hot air at the air outlet is 260℃;

S3. The second slag material is sprayed and cooled and sent to the slag bin, and the hot air is sent through the pipeline to the leaching slag volatilization kiln in the leaching slag zinc smelting process.

If the flow rate of the cold air in S2 is too small, the heat exchange efficiency is low, the temperature of the slag material in the second discharge pipe is higher than 100°C, and the material cooling is insufficient; however, the flow rate of the cold air at the air inlet will cause the temperature of the hot air at the outlet to be lower than 200℃, a small amount of slag fragments will also be brought into the hot air duct, which is not conducive to the physical and chemical reactions of the volatilization kiln in the leaching slag zinc smelting process, and is not an energy utilization optimization solution.

The temperature of high-temperature slag is calculated at 1000°C, which is equivalent to a calorific value of more than 34 kilograms of standard coal per ton of high-temperature slag, which has huge economic benefits and market. The energy saving income statistics of the present invention are shown in Table 1.

Table 1 Statistical table of energy saving benefits of the present invention

serial number name unit numerical value 1 Annual output of kiln slag t/a 150000 2 Kiln slag discharge temperature ℃ 1000 3 kiln slag cooling temperature ℃ 100 4 Kiln slag specific heat capacity (100℃) KJ/Kg·℃ 0.92 5 Kiln slag specific heat capacity (1000℃) KJ/Kg·℃ 1.32 6 Recovery enthalpy 150000*(1000*1.32-100*0.92) KJ/a 184.2*10 ⁹ 7 Equipment energy loss % 20 8 Effective recovery of heat enthalpy KJ/a 147.4*10 ⁹ 9 Converted standard coal t/a 5029 10 Standard coal unit price Yuan/t 1500 11 Estimated annual energy saving income = (10*9) Ten thousand yuan/a 754.35 12 Unit price of electricity yuan/kwh 0.51 13 Annual operating time (330 days) Hour 7920 14 Rough estimate of equipment motor power KW 63.5 15 Annual increase in electricity expenditure Ten thousand yuan/a 25.65 16 annual maintenance cost Ten thousand yuan/a 49 17 Labor cost Ten thousand yuan/a 75 18 Estimated steam production t/h 3 19 Average cost of desalination and oxygen removal Yuan/t 9 20 Water cost = (17*18*13) Ten thousand yuan/a 21.38 twenty one Estimated project income Ten thousand yuan/a 583.32 twenty two Reduce CO2 emissions t/a 13377 twenty three Reduce sulfur dioxide emissions t/a 42.7 twenty four Reduce nitrogen oxide emissions t/a 37.2

Among them, the estimated income of the project = 754.35-25.65-49-75-21.38 = 5.8332 million yuan/a.

The content illustrated in the above embodiments should be understood that these embodiments are only used to illustrate the present invention more clearly, and are not used to limit the scope of the present invention. After reading the present invention, those skilled in the art will be familiar with various equivalent forms of the present invention. All modifications fall within the scope defined by the appended claims of this application.

Claims (10)

1. The high Wen Zhaliao cooling and heat energy recycling method is characterized by comprising the following steps of:

s1, indirectly exchanging heat between high-temperature slag and cooling water under the condition of isolating air to obtain first slag, and performing flash evaporation operation on the cooling water after heat exchange to obtain saturated steam;

s2, performing air cooling heat exchange on the first slag obtained in the step S1 to obtain a second slag and heat exchanged hot air;

s3, spraying and cooling the second slag material obtained in the step S2, and then delivering the second slag material into a slag bin, and recycling hot air.

2. The method for cooling and recycling heat energy according to claim 1, wherein the cooling water in step S1 is desalted and deoxidized water, and the temperature of the cooling water is 90-95 ℃.

3. The method for high Wen Zhaliao cooling and heat energy recycling according to claim 1, wherein the temperature of the cooling water after heat exchange in step S1 is 150-170 ℃ and the saturated vapor pressure is 3-5 kg.

4. The method of claim 1, wherein the first slag temperature is 500-700 ℃ and the second slag temperature is 100 ℃ or less.

5. The method for high Wen Zhaliao cooling and heat energy recycling according to claim 1, wherein the flow rate of cold air in the cold air heat exchange process in step S2 is 20000m ³ -35000m ³ Temperature of cold air per hourThe temperature of hot air after heat exchange is over 200 ℃ and is 20-30 ℃, and the hot air after heat exchange is sent to nonferrous metal smelting or iron and steel smelting processes.

6. A device for implementing the high-temperature slag charge cooling and heat energy recycling method as claimed in any one of claims 1 to 5, which is characterized by comprising a chute (101), a water-cooling cylinder (2) and an air-cooling cylinder (3), wherein a water-cooling sleeve (102) is arranged on the outer wall of the chute (101); a plurality of cooling waterways are arranged on the water cooling cylinder (2), a first feeding pipe (213) and a sealing piece (218) are arranged at one end of the water cooling cylinder (2), a first discharging pipe (206) is arranged at the other end of the water cooling cylinder, and the chute (101) is connected with the first feeding pipe (213) in a sealing way; one end of the air cooling cylinder (3) is provided with a second feeding pipe (304) and an air outlet (304), the other end of the air cooling cylinder is provided with a second discharging pipe (310) and an air inlet (306), the second feeding pipe (304) is connected with the first discharging pipe (206), a belt conveying system (5) is arranged below the second discharging pipe (310), and a spraying device (4) is arranged on the belt conveying system (5); a feeding air interface (201) is arranged on a cylinder body at one end of the water-cooling cylinder (2) provided with the first feeding pipe (213); the water cooling cylinder (2) and the air cooling cylinder (3) are both provided with rotating assemblies.

7. The device according to claim 6, wherein the inner wall of the water-cooling cylinder (2) is spirally provided with a plurality of first spiral slices (211) along the axial direction of the water-cooling cylinder body, a plurality of first slag-pocket slices (210) are arranged between the adjacent first spiral slices (211), and the first slag-pocket slices (210) are arranged vertically to the first spiral slices (211); a plurality of third spiral sheets (312) are spirally arranged in the air cooling cylinder (3) along the direction of the axis of the air cooling cylinder, a plurality of third slag-pocket sheets (311) are arranged between every two adjacent third spiral sheets (312), and the third slag-pocket sheets (311) are perpendicular to the third spiral sheets (312).

8. The high Wen Zhaliao cooling and thermal energy recycling device according to claim 7, wherein the cooling waterway comprises a first waterway (208) and a second waterway (209), the first waterway (208) is spirally arranged on the first spiral sheet (211) along the axis direction of the water-cooled cylinder, and the second waterway (209) is arranged on the outer wall of the water-cooled cylinder; a plurality of second spiral sheets (214) are arranged on the first waterway (208), a plurality of second slag-pocket sheets (215) are arranged between the adjacent second spiral sheets (214), and the second slag-pocket sheets (215) are perpendicular to the second spiral sheets (214).

9. The high Wen Zhaliao cooling and heat energy recycling device according to claim 8, wherein an annular water chamber (217) is arranged at one end of the water cooling cylinder (2) far away from the first feeding pipe (213), an adapter (216) is arranged on the annular water chamber (217), and a water inlet (204) and a water return port (205) are arranged on the adapter (216); an inner annular water chamber (2171) and an outer annular water chamber (2172) are arranged in the annular water chamber (217); one end of the inner annular water chamber (2171) is connected with the first waterway (208), and the other end of the inner annular water chamber is connected with the water return port (205); one end of the outer ring water chamber (2172) is connected with the second waterway (209), and the other end is connected with the water inlet (204); one end of the water cooling cylinder (2) provided with a first feeding pipe (213) is provided with a water chamber (212), and the water chamber (212) is communicated with a first waterway (208) and a second waterway (209).

10. The high Wen Zhaliao cooling and heat energy recycling device according to claim 6, wherein a first refractory castable layer (202) is arranged on the inner wall of the water-cooled cylinder (2) at one end provided with a first feeding pipe (213); the inner wall of the air cooling cylinder (3) provided with one end of the second feeding pipe (304) is provided with a high-temperature resistant layer, and the high-temperature resistant layer is sequentially provided with a plastic pouring layer (309), a second refractory pouring material layer (308) and an aluminum silicate fiber felt layer (307) along the radial direction of the air cooling cylinder.