阅读说明：本技术 一种高温钢渣风淬造粒热回收系统 (High temperature slag air quenching granulation heat recovery system ) 是由 张世才 于 2021-09-17 设计创作，主要内容包括：本发明涉及节能环保技术领域,且公开了一种高温钢渣风淬造粒热回收系统,包括热回收车间,余热锅炉、颚式破碎机、回转式冷却筒,热回收车间包括倾翻台、热回收床、挡板,倾翻台下方设置有超音速喷嘴,热回收床底部设置有高压风机,热回收床尾部设置有颚式破碎机,颚式破碎机下游设置有回转式冷却筒,回转式冷却筒外壁圆周侧设置有冷却水管,冷却水管内部接入有冷却水。该一种高温钢渣风淬造粒热回收系统,每吨钢渣中的回收的余热可以发50度电,大大降低了碳排放,为我国碳中和做出一定贡献；且采用急冷的风淬钢渣处理工艺,可以显著增加钢渣的活性和易磨性,有利用钢渣的高质化利用。(The invention relates to the technical field of energy conservation and environmental protection, and discloses a high-temperature steel slag wind quenching granulation heat recovery system which comprises a heat recovery workshop, a waste heat boiler, a jaw crusher and a rotary cooling cylinder, wherein the heat recovery workshop comprises a tipping platform, a heat recovery bed and a baffle plate, a supersonic nozzle is arranged below the tipping platform, a high-pressure fan is arranged at the bottom of the heat recovery bed, the jaw crusher is arranged at the tail of the heat recovery bed, the rotary cooling cylinder is arranged at the downstream of the jaw crusher, a cooling water pipe is arranged on the circumferential side of the outer wall of the rotary cooling cylinder, and cooling water is connected into the cooling water pipe. According to the high-temperature steel slag wind quenching granulation heat recovery system, the recovered waste heat in each ton of steel slag can generate 50-degree electricity, so that the carbon emission is greatly reduced, and certain contribution is made to carbon neutralization in China; and the quenching air quenching steel slag treatment process is adopted, so that the activity and the grindability of the steel slag can be obviously improved, and the high-quality utilization of the steel slag is facilitated.)

1. The utility model provides a high temperature slag air quenching granulation heat recovery system which characterized in that: including the heat recovery workshop, exhaust-heat boiler, jaw breaker, rotation cooling cylinder, the heat recovery workshop is including tipping platform, heat recovery bed, baffle, the tipping platform below is provided with the supersonic nozzle, heat recovery bed bottom is provided with high pressure positive blower, heat recovery bed afterbody is provided with jaw breaker, jaw breaker low reaches are provided with the rotation cooling cylinder, rotation cooling cylinder outer wall circumference side is provided with condenser tube, condenser tube inside access has the cooling water.

2. The high-temperature steel slag wind quenching granulation heat recovery system as claimed in claim 1, is characterized in that: the supersonic nozzle is externally connected with an air storage tank.

3. The high-temperature steel slag wind quenching granulation heat recovery system as claimed in claim 1, is characterized in that: the number of the high-pressure fans is a plurality, and the high-pressure fans are distributed below the heat recovery bed.

4. The high-temperature steel slag wind quenching granulation heat recovery system as claimed in claim 1, is characterized in that: and the cooling water pipe is communicated with the waste heat boiler through a pipeline.

5. The high-temperature steel slag wind quenching granulation heat recovery system as claimed in claim 1, is characterized in that: the heat recovery process of the high-temperature steel slag wind quenching granulation heat recovery system comprises the following steps,

s1, conveying the slag car driven out from the steel-making workshop to a heat recovery workshop along a rail, hoisting the slag car to a tipping platform by using an electric travelling crane, forming supersonic jet flow by high-pressure air in a gas storage tank below the supersonic jet flow through a supersonic nozzle, crushing the steel slag and granulating;

s2, sprinkling the granulated steel slag on a heat recovery bed, blowing high-pressure cold air continuously below the heat recovery bed, continuously cooling the high-temperature material in the advancing process, continuously solidifying the surface, continuously heating the cold air, enabling the heated high-temperature air to reach about 700 ℃, sending the heated high-temperature air into a waste heat boiler, absorbing heat by hot water in the waste heat boiler, then changing the heat into steam, sending the steam to a steam turbine for power generation, and sending the cooled air to a dust collector for purification and then discharging the air outside;

s3, crushing some agglomerated materials by a jaw crusher arranged at the tail of the heat recovery bed, enabling the temperature of the materials after jaw breakage to be between 400 ℃ and 500 ℃, entering a rotary cooling cylinder for further cooling, enabling the outer ring of the cooling cylinder to be a cooling water pipe, introducing cooling water into the cooling water pipe, absorbing heat of the wall of the rotary cooling cylinder, and delivering heated hot water into a waste heat boiler for use.

6. The system for wind quenching, granulating and heat recovering of high-temperature steel slag according to claim 5 and step S1, wherein the system comprises: the grain size of the granulated steel slag is 80% less than 2 mm.

7. The system for wind quenching, granulating and heat recovering of high-temperature steel slag according to claim 5 and step S2, wherein the system comprises: the heat recovery bed is arranged in a pushing rod type structure, and the heat recovery bed is arranged in a small inclination angle.

8. The system for wind quenching, granulating and heat recovering of high-temperature steel slag according to claim 5 and step S3, wherein the system comprises: the temperature of the material discharged from the rotary cooling cylinder is approximately within 100 ℃, the material is sent to a steel slag warehouse for use, and the temperature of cold air leaking into the cooling cylinder is about 200 ℃ after heat exchange with hot material, and the cold air is sent to a waste heat boiler of a medium-low temperature boiler for use.

Technical Field

The invention relates to the technical field of energy conservation and environmental protection, in particular to a high-temperature steel slag wind quenching granulation heat recovery system.

Background

At present, the annual steel yield of China is about 10 hundred million tons, one ton of steel generates about 0.1 ton of steel slag, the annual steel slag yield is about 1 hundred million tons, the temperature of the steel slag is about 1200 ℃, the enthalpy of the steel slag is about 1260MJ/t, and the steel slag belongs to high-quality waste heat resources, so that the recovery of the waste heat energy of the high-temperature steel slag is an important way for energy conservation and emission reduction of steel enterprises. The generated steam causes certain pollution to a factory building, the processed steel slag contains certain moisture, subsequent heating and drying are needed, heat energy is wasted, and the activity of the steel slag of the current processing technologies is poor.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a high-temperature steel slag wind quenching granulation heat recovery bed and rotary cooling cylinder system, which is used for recovering waste heat in high-temperature steel slag, wherein in the first process, the heat recovery bed is used for rapidly cooling materials, the temperature of the steel slag is cooled from 1200 ℃ to 500 ℃, the heat recovery efficiency is high, and the heat efficiency of the recovered waste heat generating high-temperature supersaturated steam is high; the activity of the quenched steel slag is good, but the investment and operation cost are high; the steel slag in the second procedure is cooled from 500 ℃ to 200 ℃, the waste heat replaced in the middle temperature section is only suitable for producing hot water, in order to reduce the investment and the operation cost of heat recovery, the rotary cooling cylinder is utilized to continuously cool the steel slag, the hot water after cooling the steel slag is sent to a waste heat boiler for use, the gas production of the waste heat boiler is favorably improved, and the total waste heat recovered per ton of steel slag can generate 50-DEG electricity; at present, 0.5 million tons of steel slag with good fluidity in China can be treated by adopting a wind quenching granulation and waste heat recovery method, 25 million DEG electricity can be generated by the waste heat recovered every year, 9925 million tons of standard coal can be saved in 1 year, and the method can make an important contribution to carbon neutralization in China.

In order to achieve the purpose of the high-temperature steel slag wind quenching granulation heat recovery system, the invention provides the following technical scheme: the utility model provides a high temperature slag air quenching granulation heat recovery system, includes the heat recovery workshop, exhaust-heat boiler, jaw breaker, rotation cooling cylinder, the heat recovery workshop is including tipping platform, heat recovery bed, baffle, the tipping platform below is provided with the supersonic speed nozzle, heat recovery bed bottom is provided with high pressure positive blower, heat recovery tailstock portion is provided with jaw breaker, jaw breaker low reaches are provided with the rotation cooling cylinder, rotation cooling cylinder outer wall circumference side is provided with condenser tube, the inside access of condenser tube has the cooling water.

Preferably, the supersonic nozzle is externally connected with an air storage tank.

Preferably, the number of the high-pressure fans is a plurality, and the high-pressure fans are distributed below the heat recovery bed.

Preferably, the cooling water pipe is in through connection with the waste heat boiler through a pipeline.

Further, the heat recovery process of the high-temperature steel slag wind quenching granulation heat recovery system comprises the following steps,

s1, conveying the slag car driven out from the steel-making workshop to a heat recovery workshop along a rail, hoisting the slag car to a tipping platform by using an electric travelling crane, forming supersonic jet flow by high-pressure air in a gas storage tank below the supersonic jet flow through a supersonic nozzle, crushing the steel slag and granulating;

s2, sprinkling the granulated steel slag on a heat recovery bed, blowing high-pressure cold air continuously below the heat recovery bed, continuously cooling the high-temperature material in the advancing process, continuously solidifying the surface, continuously heating the cold air, enabling the heated high-temperature air to reach about 700 ℃, sending the heated high-temperature air into a waste heat boiler, absorbing heat by hot water in the waste heat boiler, then changing the heat into steam, sending the steam to a steam turbine for power generation, and sending the cooled air to a dust collector for purification and then discharging the air outside;

s3, crushing some agglomerated materials by a jaw crusher arranged at the tail of the heat recovery bed, enabling the temperature of the materials after jaw breakage to be between 400 ℃ and 500 ℃, entering a rotary cooling cylinder for further cooling, enabling the outer ring of the cooling cylinder to be a cooling water pipe, introducing cooling water into the cooling water pipe, absorbing heat of the wall of the rotary cooling cylinder, and delivering heated hot water into a waste heat boiler for use.

Preferably, the particle size of the granulated steel slag in the step S1 is 80% smaller than 2 mm.

Preferably, the heat recovery bed arrangement in step S2 is a push rod type arrangement, and the heat recovery bed is a low tilt angle arrangement.

Preferably, the temperature of the material discharged from the rotary cooling cylinder in the step S3 is approximately within 100 ℃, the material is sent to a steel slag warehouse for use, and the temperature of cold air leaking into the cooling cylinder is about 200 ℃ after heat exchange with hot material, and the cold air is sent to a waste heat boiler of a medium-low temperature boiler for use.

Compared with the prior art, the invention provides a high-temperature steel slag wind quenching granulation heat recovery system, which has the following beneficial effects:

1. according to the high-temperature steel slag air quenching granulation heat recovery system, seamless connection is carried out between the steel slag treatment process and a steel-making workshop, the system is built behind the steel-making workshop, after a furnace is smelted, a slag tank car is immediately taken out, the slag tank car is hoisted to an electric tilting mechanism by an electric vehicle to be tilted, the continuity of steel slag treatment is ensured, the temperature of the steel slag is ensured as far as possible, and the fluidity of the steel slag is favorably ensured;

2. the high-temperature steel slag wind quenching granulation heat recovery system is provided with the special supersonic jet nozzle, ensures that the steel slag is crushed by enough high wind speed and kinetic energy, ensures the reliability of steel slag granulation, ensures that the grain diameter of steel slag granules granulated by the supersonic jet nozzle is less than 5mm, is favorable for magnetic separation and iron removal, does not need rod grinding in the follow-up process, reduces the intermediate process, and is favorable for saving the investment of steel slag treatment;

3. the high-temperature steel slag air-quenching granulation heat recovery system is provided with a special heat recovery bed, the gap between grid plates of the bed body can reach 0.8mm precision, the grid bed is prevented from leaking materials, longitudinal cross-shaped pushing rods are arranged on the grid bed and used for longitudinally pushing materials, and transverse pushing rods are respectively arranged on two sides of the bed body and used for transversely distributing materials, so that the uniform distribution of the materials on the grid bed is ensured; the grate bed is designed to be arranged at a small inclination angle, so that the conveying efficiency of materials is ensured; the bed body is designed by adopting a high-resistance grate plate, high-pressure air is blown into the lower part of the grate bed for cooling materials, heat in the materials is replaced, the heat recovery efficiency of the materials is ensured, the temperature of the materials discharged from the heat replacement bed is controlled below 500 ℃, the temperature of the replaced hot air is above 700 ℃, high-temperature hot air can generate high-temperature supersaturated steam, higher heat conversion efficiency is ensured, and a jaw crusher is arranged at the tail part of the heat replacement bed for crushing the bonded materials;

4. according to the high-temperature steel slag wind quenching granulation heat recovery system, a medium-temperature material is cooled by adopting a special water-cooled cooling cylinder, a cooling water pipe is arranged on the outer wall of the cooling cylinder, cold water is introduced into a feeding end to exchange heat with an internal hot material continuously, and heated hot water flows out from a discharging end and is fed into a waste heat boiler for use;

5. according to the high-temperature steel slag wind quenching granulation heat recovery system, the recovered waste heat in each ton of steel slag can generate 50-degree electricity, so that the carbon emission is greatly reduced, and certain contribution is made to carbon neutralization in China;

6. the high-temperature steel slag wind quenching granulation heat recovery system adopts a quenching wind quenching steel slag treatment process, can obviously increase the activity and the grindability of the steel slag, and is beneficial to high-quality utilization of the steel slag.

Drawings

FIG. 1 is a schematic view of the process flow structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the high-temperature steel slag air quenching granulation heat recovery system comprises a heat recovery workshop, a waste heat boiler, a jaw crusher and a rotary cooling cylinder, wherein the heat recovery workshop comprises a tipping platform, a heat recovery bed and a baffle plate, a supersonic nozzle is arranged below the tipping platform, a high-pressure fan is arranged at the bottom of the heat recovery bed, the jaw crusher is arranged at the tail of the heat recovery bed, the rotary cooling cylinder is arranged at the downstream of the jaw crusher, cooling water pipes are arranged on the circumferential side of the outer wall of the rotary cooling cylinder, and cooling water is connected into the cooling water pipes.

In conclusion, the air quenching granulation heat recovery process of the high-temperature steel slag air quenching granulation heat recovery system comprises the following steps of conveying a slag tank car taken out from a steel-making workshop into the heat recovery workshop along a track, hoisting the slag tank car onto a tilting platform by using an electric travelling crane, forming supersonic jet flow by high-pressure air below the supersonic jet flow through a supersonic nozzle to break and granulate the steel slag, wherein the grain diameter of the granulated steel slag is 80% or less than 2mm, the granulated steel slag is sprinkled onto a heat recovery bed, in order to prevent the leakage of the heat recovery bed, ensure the uniform distribution of the heat recovery bed and the pushing efficiency of materials of the heat recovery bed, the heat recovery bed is arranged in a pushing rod type structure, the heat recovery bed is arranged in a small inclination angle, high-pressure cold air is continuously blown into the heat recovery bed, the high-temperature materials are continuously cooled in the advancing process, the surfaces are continuously solidified, the materials are prevented from being bonded together, and the cold air is heated continuously, the heated high-temperature air is sent into a waste heat boiler, heat is absorbed by hot water in the waste heat boiler and then is changed into steam which is sent to a steam turbine for power generation, and the cooled air is sent to a dust collector for purification and then is discharged; the heat recovery bed is characterized in that a jaw crusher is arranged at the tail of the heat recovery bed, some caked materials are crushed by the jaw crusher, the temperature of the materials after the materials are discharged from the jaw crusher is about 400-500 ℃, the materials enter a rotary cooling cylinder for further cooling, a cooling water pipe is arranged on the outer ring of the cooling cylinder, cooling water is introduced into the cooling water pipe to absorb heat of the wall of the rotary cooling cylinder, heated hot water is sent into a waste heat boiler for use, the effect of a coal economizer is achieved, the steam quantity generated by the waste heat boiler is increased, the temperature of the materials discharged from the rotary cooling cylinder is about 100 ℃, the materials are sent into a steel slag warehouse for use, and cold air leaked into the cooling cylinder and the hot materials are subjected to heat exchange to reach about 200 ℃ and are sent into the waste heat boiler of the medium-low temperature boiler for use.

The working use process and the installation method of the invention are that when the high-temperature steel slag air quenching granulation heat recovery system is used, the system is in seamless connection with a steel-making workshop through a steel slag treatment process, the system is built behind the steel-making workshop, after a furnace is smelted, a slag tank car is immediately driven out, the slag tank is hoisted to an electric tipping mechanism by an electric vehicle to tip, the continuity of steel slag treatment is ensured, the temperature of the steel slag is ensured as far as possible, and the fluidity of the steel slag is favorably ensured; meanwhile, the special supersonic jet nozzle is designed, so that the steel slag is crushed by ensuring the high enough wind speed and kinetic energy, the reliability of steel slag granulation is ensured, the steel slag granules granulated by the supersonic jet nozzle have the particle size of below 5mm, the magnetic separation and iron removal are facilitated, rod grinding is not required subsequently, the intermediate process is reduced, and the investment for steel slag treatment is facilitated to be saved; meanwhile, a special heat recovery bed is designed, the gap between grid plates of the bed body can reach 0.8mm precision, the grid bed is prevented from leaking materials, longitudinal cross pushing rods are arranged on the grid bed and used for longitudinally pushing materials, and transverse pushing rods are respectively arranged on two sides of the bed body and used for transversely distributing materials, so that the uniform distribution of the materials on the grid bed is ensured; the grate bed is designed to be arranged at a small inclination angle, so that the conveying efficiency of materials is ensured; the bed body is designed by adopting a high-resistance grate plate, high-pressure air is blown into the lower part of the grate bed for cooling materials, heat in the materials is replaced, the heat recovery efficiency of the materials is ensured, the temperature of the materials discharged from the heat replacement bed is controlled below 500 ℃, the temperature of the replaced hot air is above 700 ℃, high-temperature hot air can generate high-temperature supersaturated steam, higher heat conversion efficiency is ensured, and a jaw crusher is arranged at the tail part of the heat replacement bed for crushing the bonded materials; in addition, the medium-temperature material is cooled by a special water-cooled cooling cylinder, a cooling water pipe is arranged on the outer wall of the cooling cylinder, cold water is introduced into a feeding end to exchange heat with the hot material in the cooling cylinder continuously, and the heated hot water flows out from a discharging end and is fed into a waste heat boiler for use;

according to the high-temperature steel slag wind quenching granulation heat recovery system, the recovered waste heat in each ton of steel slag can generate 50-degree electricity, so that the carbon emission is greatly reduced, and certain contribution is made to carbon neutralization in China; and the quenching air quenching steel slag treatment process is adopted, so that the activity and the grindability of the steel slag can be obviously improved, and the high-quality utilization of the steel slag is facilitated.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.