CN108203748B - Slag treatment process and device by explosion method - Google Patents

Abstract

The invention provides a novel method and a novel device for treating metallurgical slag and utilizing heat. The method utilizes the phenomenon that slag frequently explodes in water in the production process of a blast furnace, combines the process principle of the phenomenon with the slag treatment process principle of a steam method, utilizes the explosion process of slag in water to carry out slag treatment and heat utilization, cools the slag by the vaporization of water and the overheating process of steam, directly outputs high-temperature slag and steam, and carries out heat utilization after the slag and the steam are output. The method changes the on-site single explosion process into the slag treatment explosion process of continuous slag feeding in the closed container, realizes the slag treatment process of continuous explosion, realizes two work contents of slag granulation and heat exchange in one set of system device, has the advantages of water saving, energy saving, environmental protection, simple equipment, small occupied area, investment saving, high heat utilization efficiency and the like, creates convenient conditions for subsequent heat utilization, and has practical popularization and application values.

Description

Slag treatment process and device by explosion method

Technical Field

The invention belongs to the metallurgical slag granulation and slag treatment processes, and particularly relates to a metallurgical liquid slag granulation method, and a waste heat utilization process and device thereof.

Background

A large amount of metallurgical slag is generated in China every year, and the existing slag treatment methods which are tested or prepared to be tested mainly comprise a water quenching method, an air quenching method, a mechanical granulation air-adding method or a water-adding granulation method. The water quenching method mainly comprises a plurality of methods such as a Lasa method (RASA), an INBA method, a round method, a Mingte method, a sedimentation tank, a slag soaking method, a hot splashing method, a hot stewing method and the like, the methods are all classified into a water quenching and water cooling process, the slag is granulated and cooled by adopting a water spraying or water feeding mode, the slag heat is completely fed into water, the water consumption is large due to low enthalpy heat of the water, and the slag-water ratio is generally 1: about 6-12, and the biggest problem of the water quenching method is that the sensible heat resource of the blast furnace slag is not utilized, a large amount of heat resource is wasted, the water consumption is large, and the environment is polluted.

The air quenching method cools slag by high-pressure air, because the specific heat of the air is low, slag granulation can be carried out by external input power energy, the required air quantity and fan power are large, the equipment is large due to large air quantity, the energy consumption is high, the economic benefit is poor, and meanwhile, the environment is polluted, and the popularization and the application are difficult. The mechanical granulation and air-adding or water-adding granulation process is still in the theoretical research and test stage, a plurality of key technical problems need to be solved at present, and breakthrough development is difficult to achieve in a short period.

At present, the utilization rate of residual heat of slag is low, so-called utilization is that hot water generated in the water quenching and cooling process of blast furnace slag by part of northern iron and steel enterprises is used for heating in winter, and the utilization rate of the heat energy of the slag is less than 3 percent due to the limitation of conditions such as heat supply areas, flow and the like. And the solar energy heat collector can not be used in spring, summer and autumn, a large amount of heat is discharged through a fan or outside water, so that the environment is polluted and energy is wasted.

At present, the research patents of the utilization of sensible heat of slag at home and abroad are few, and the methods are also many. The theory of utilizing the vaporization and overheating processes of water to take away slag heat in a closed container is firstly proposed by the inventor at home and abroad, and although the patent market at present has a plurality of patents similar to the principle and the method, the patent market is an infringing behavior. Application No. 200710157873 discloses a blast furnace slag treatment and slag heat energy utilization method and an implementation device; the application No. 200810229364 applies for a steam circulation method blast furnace slag heat energy utilization and slag treatment implementation device, the application No. 201510557647.9 applies for a boiler steam-water circulation method slag treatment process, the application No. 201510557648.3 applies for an overheated steam circulation method slag treatment process, the core of the several patents adopts a water quenching and water cooling process, slag is cooled by using the vaporization of water and the steam overheating process, steam is generated by water quenching of slag in a closed container, and steam output is utilized for heat.

The slag treating process and apparatus by explosion method features that the principle of explosion and part of apparatus structure are applied to the slag treating process, the slag is treated and thermally used in the explosion process, the slag is cooled by the vaporization of water and the overheat of steam, and the high-temp slag and steam are directly output. The new slag granulation process combines the steam slag treatment process principle with the explosion slag treatment process principle, utilizes the explosion process of slag entering water to carry out slag treatment heat utilization, cools the slag by the vaporization of water and the overheating process of steam, directly outputs high-temperature slag and steam, and outputs the slag and the steam for heat utilization after heat exchange. The process has the advantages that one set of device realizes the heat exchange process while realizing slag granulation, can realize high exergy steam output, has a unique process technical method, has no relevant data report at home and abroad at present, and belongs to a brand new slag granulation and heat utilization method and device.

Description of the existence of explosive granulation and heat exchange phenomena:

the blast energy exists in the slag water quenching granulation process, the energy is very large, if the blast energy generated by water quenching steam can be used for carrying out the slag granulation and heat exchange process, the equipment and the process for slag granulation and heat exchange are greatly simplified and shortened, unnecessary external energy input in the slag granulation process is reduced or eliminated, and a series of problems caused by external energy input in granulation by additionally adding a mechanical granulation device and the like are avoided.

When a blast furnace of a certain iron-making plant is on duty, the inventor comes to an example that about 5-10kg of water is sprayed into a blast furnace slag tank in rainy days, the blast furnace slag tank is found after slag is discharged by a stokehole worker, the stokehole worker knows that water in the tank can explode and hide quickly, the slag is blown to the tank by a clattering sound after the slag enters the tank, the slag is rapidly granulated and thrown into the air by the stokehole worker, the height of the slag is 10 m, the slag is specially picked up and granulated after the blast furnace slag is shot, the effect of granulating the two kinds of slag is specially broken, and the effect of granulating the slag is found after the slag is shot, and the difference between the slag and water-quenched slag is not great.

This process can be described simply as: the slag is quenched with water to generate a large amount of steam, the steam rapidly expands in a limited explosion space to form explosion (the production is also called water explosion and steam explosion), and the explosion can further granulate the slag and push the slag out of the tank; the heat exchange process is that the slag in the tank exchanges heat by utilizing the processes of water vaporization and steam overheating, and the slag outside the tank exchanges heat by air cooling; the slag crushing and granulating are realized by water quenching and explosion processes. Specifically, the slag water quenching process has steam expansion explosion energy, if slag treatment and heat exchange processes can be carried out by using the explosion energy, the simultaneous heat exchange of the slag treatment can be realized, high pressure is formed by using the explosion process, the rapid heat exchange can be realized, and the heat exchange rate is improved.

The slag granulation process by the novel explosion method is to simulate the actual phenomenon that slag explodes in water, carry out slag treatment and heat utilization by utilizing the principle of the phenomenon, cool the slag by the vaporization of water and the overheating process of steam, directly output high-temperature slag and steam, and carry out heat utilization after the slag and the steam are output.

The main innovation points of the novel explosive slag granulation and heat utilization process are as follows:

the new blast method slag granulation and heat utilization process method is that according to the phenomenon that slag often explodes in water in production, the blast process is utilized to process and utilize the slag, the slag is cooled by the vaporization of water and the overheating process of steam, high temperature slag and steam are directly output, the slag and the steam are output and then utilized, no relevant data report is found at present when the blast method is adopted and the blast process of slag entering water is utilized to process and utilize the slag, and the invention belongs to the original invention, and the main innovation points of the invention are that:

a. the principle of the phenomenon that slag explodes in water and part of devices are applied to a new slag treatment process, the principle of the slag treatment process by a steam method is combined with the actual phenomenon that the slag explodes in water, the slag treatment heat utilization is carried out in the explosion process of the slag entering water, the slag treatment is carried out in a closed container by the principle of the slag treatment process by the steam method, the slag is cooled by the vaporization of water and the overheating process of steam, the slag heat is taken away by the steam, high-temperature slag and steam are directly output, and the slag and the steam are output for heat utilization after heat exchange;

b. the difficulty of adopting the slag granulation process by the explosion method is the problem of fractional and quantitative feeding in the closed slag treatment tank, the novel slag granulation process by the explosion method adopts a unique quantitative feeding method and a unique quantitative feeding device to change continuous blast furnace production feeding into the quantitative and fractional feeding meeting the requirements of the slag treatment process by the explosion method, and change the single explosion phenomenon process frequently generated in production into the continuous explosion slag treatment process meeting the requirements of the blast furnace production process, and the important innovation point of the invention is to solve the problem of the quantitative feeding of the explosion tank, the function of the quantitative feeding device is simply equivalent to that of a revolver ' rotating wheel system ' or an automatic rifle ' bullet feeding ' cartridge clip system ', the continuous shooting of the gun and the bullet is realized through the rotating wheel and the bullet clip, and the technological process of continuous slag treatment heat utilization by utilizing the explosion energy is realized through the quantitative feeding device;

c. the process further comprises the steps of moving a slag tank which is exploded on site into a new closed slag treatment device through improvement, changing the continuous feeding of blast furnace slag into step-by-step and quantitative feeding meeting the requirements of the explosion process by arranging a quantitative feeding system device, solving the difficult problems of step-by-step and quantitative slag feeding and water feeding into the closed slag treatment tank and the explosion tank by arranging a quantitative water supply device and a coordinated working system of slag feeding and water feeding, further realizing the continuous slag treatment heat utilization by utilizing the explosion process and the explosion energy, and realizing the new explosion-method slag treatment and heat utilization process;

d. the novel blast-process slag treatment process still adopts water as a cooling medium, and continues a water quenching steam cooling process of a steam method, so that the property of slag is not changed in the whole slag treatment process, and the subsequent utilization of the slag is not influenced; the process utilizes the principle of the slag treatment process by a steam method, utilizes the characteristics of large specific heat of water and steam, and much heat absorption in the process of water vaporization and steam overheating to carry out slag heat exchange, and takes away the slag heat by the steam, so the method has the advantages of water saving, energy saving, environmental protection and the like; the process breaks slag by water quenching and explosion processes in slag entering water, heat exchange is carried out while slag granulation is carried out, slag heat is carried away by steam, steam and slag output are used for heat utilization, no power input and no operating part are arranged in the main granulation and heat exchange processes of the process, and a set of system device simultaneously meets two working processes of slag granulation and heat exchange, so that the process device has the advantages of simple equipment, energy conservation, low production cost and the like;

e. the novel slag treatment process method adopts a closed container to carry out slag granulation and heat exchange, directly outputs high-temperature slag and steam, outputs the slag and the steam for heat utilization, can output superheated steam and the high-temperature slag, also can output a mixture of saturated steam, industrial exhaust steam and slag water, can generate dry slag and can also generate water slag, and a set of system devices realizes various process requirements of slag treatment, heat exchange and the like.

The further new blast method slag treatment process method is another new process method formed by combining the blast method slag treatment process and the steam method process principle, and the process method has wide practical application value.

Disclosure of Invention

The invention provides a novel slag granulation method and a novel slag granulation device, aiming at the defects that the existing metallurgical slag granulation process can not realize heat utilization, and the process methods of granulation by additional power equipment, high energy consumption, complex equipment and the like in the existing patent slag granulation process are insufficient. The technological process combines the technological principle of slag treatment with that of slag treatment with explosion method, utilizes the explosion process of slag in water to utilize heat of slag treatment, cools slag via vaporization of water and overheat of steam, and outputs high temperature slag and steam directly.

The slag treatment process principle by a steam method comprises the following steps: the slag is treated in a closed container, the slag is cooled by adopting a water quenching steam cooling process, the slag is cooled mainly by the vaporization of water and a steam overheating process, and saturated or overheated steam is directly output to realize the recycling of slag heat.

The blast method slag treatment process principle is as follows: the water is filled in the tank, the slag is put into the water, the slag is quenched and granulated with the water to generate a large amount of steam, the steam is rapidly expanded in a limited space to form explosion, and the explosion can rapidly granulate the slag and exchange heat to push the slag out of the tank.

Furthermore, the phenomenon that slag is often exploded into water in the production process of a blast furnace is simulated, the explosion process and a slag tank device thereof are moved into a closed container to be carried out, the single explosion process on site is changed into the slag treatment explosion process of continuous slag feeding in the closed container, the requirements of the metallurgical slag production process are met, the novel explosion method slag treatment process method introduces structural devices such as a swinging chute, a slag turning tank, a slag feeding device, a quantitative water feeding device and the like which are often applied in production into the novel slag treatment process, and the quantitative and step-by-step feeding is realized through a working system and a working method which are coordinated and matched with each other among the devices, so that the continuous explosion slag treatment process in the slag treatment device is realized.

The process is characterized in that the slag treatment heat utilization can be realized by utilizing the explosion process, the slag is granulated by utilizing the explosion process, the slag heat is taken away mainly by the steam, the high-temperature slag and the steam are directly output, and the high-temperature slag and the steam are output for heat utilization.

The slag treatment process system device by the explosion method mainly comprises a slag flowing groove, a buffer slag tank, a quantitative feeding device, a slag treatment tank, an explosion tank, a quantitative water supply device, a rotary driving device, a secondary heat exchanger, a slag discharging device and the like, wherein the most important parts are the quantitative feeding device and the explosion tank, the process system is shown in figure 1, figure 2 is another simple installation application example of figure 1, figure 3 is an application example of the explosion tank adopting four-tank installation of figure 1, figures 4 and 5 are installation application examples of the slag feeding device adopting a turnover valve, a turnover hopper, a rotary blanking valve or a slag turnover tank and a rotary blanking tank of figure 1, figure 6 is an application example of an installation structure of the explosion tank adopting a cover, adopting a spherical slag treatment tank, combining a swing chute and a piston slag feeding device and laterally feeding and discharging.

Further, among the system devices:

the quantitative feeder is a system device which changes the continuous blast furnace slag feeding into step-by-step and quantitative feeding according to the slag treatment process requirement of an explosion method, and is generally composed of 1-3 devices or devices to realize the function requirement, and the device and the devices are mutually matched by a coordination system and a method, the mature quantitative feeder is currently considered to be a swing chute, a slag turning tank, a slag runner and a combination form of the swing chute, the slag turning tank, the slag runner, the turning hopper, a rotary tank, a blanking valve and a combination form of a working system matched with the swing chute, the slag turning tank, the slag runner, the turning hopper, the rotary tank and the blanking valve, the slag feeder has various structural forms, a piston type slag feeder is adopted, a slag turning tank dumping device is adopted, a specially designed rotary hopper, a tank and a valve type slag feeder, a conveyor, a valve and the like are adopted, the requirement of the step-by-step slag conveying process is realized by the equipment or the device. The example of the figure 1 shows a configuration form of a combination of a slag turning tank, a swinging chute and a piston slag conveying device, wherein the swinging chute can be a swinging chute which is applied to the existing blast furnace production and can swing left and right in a rotating way or a swinging chute which is designed by special improvement and can swing up and down in a fluctuating way, when the configuration form of the swinging chute and the piston slag conveying device in figures 3 and 6 is adopted, the piston slag conveying device is generally used in pairs, the piston slag conveying device can realize the continuous explosive slag treatment working process of an explosive tank by the left and right swinging feeding of the swinging chute and the intermittent slag conveying feeding of the slag conveying device, when the configuration form of the slag turning tank and the piston slag conveying device is adopted, the piston slag conveying device can also adopt single operation according to the requirement, when 2-8 explosive tanks are installed in one slag treatment tank, the slag conveying device generally adopts 2-8 configurations, the specific number is determined according to the number of the explosive tanks. In the example of figure 2, a working form of combination of a slag pot and a piston slag conveying device is adopted, meanwhile, the system device combines a slag treatment pot and an explosion pot into a whole, a rotary driving device of the explosion pot is omitted, and in order to meet the requirement of continuous material conveying, the slag pot has the functions of tipping and deslagging, and the slag conveying device can adopt 1-2 configurations as required. Fig. 3, 4 and 5 show different structural combinations of the swing chute and the slag tank with a piston, a turning hopper or a tank, a rotary blanking valve and other slag conveying devices.

The explosion tank is a place where slag and water are mixed and exploded, is a semi-closed tank body container with an opening at one side, and is a structure which is formed by improving the existing blast furnace slag tank in order to meet the new slag treatment process requirements, the installation quantity of the explosion tank can be generally arranged by 1-8 blast furnace slag tanks according to the size of a blast furnace and the production requirements, the tank openings can be arranged upwards, horizontally or in an up-and-down symmetrical arrangement mode or in a certain inclined angle according to the production process requirements, or in a rotating wheel of a 'revolver' or in a piston type of an engine, the tank generally has the functions of overturning and rotating according to the requirements, the slag dumping process is realized by overturning and rotating, and the problems of slag cleaning and dumping can be solved by adopting other simpler methods, such as adopting a switch valve, a rotary valve and the like, and the problem of material cleaning and residue can be solved by adopting a water-cooled wall outside the, The water-cooled tube is also allowed to be covered according to the requirements, if a ball valve type cover and an overturning type cover are additionally arranged, the pressure-building process of closing the cover after feeding is realized by additionally arranging the covers, the high-pressure strong explosion process in the tank is realized by the aid of the pressure-building in the tank and the quick cover-opening process of the quick cover-opening device, and the purposes of strengthening granulation and heat exchange are realized by the aid of the high-pressure strong explosion process The explosion tank in the figure 6 adopts a mode of two tanks, horizontal installation and symmetrical arrangement of tank opening capping, realizes pressure building through capping, and realizes the purposes of enhanced granulation and heat exchange by means of pressure building.

The buffer slag pot is a slag storage pot, the pot is convenient for slag storage and transportation, or convenient for uniform flow slag pouring, slag processing requirements and the like, and the adopted temporary slag containing device is adopted, the buffer slag pot can be taken as a part of a quantitative feeding device to be understood and applied in a system device, and can also be taken as a temporary slag containing container independent of the quantitative feeding device to be understood and applied, and when slag is directly connected into a slag ditch or indirectly connected into the slag processing pot through other conveying devices, the buffer slag pot can be cancelled.

The slag processing tank is a tank body container for sealing the slag processing explosion process and storing slag, belongs to a pressure container and is manufactured by a pressing force container, and can adopt a spherical shape, a cylindrical shape or other special structural shapes, the upper part of the container is provided with a feeding device for step-by-step quantitative feeding, the interior of the container is provided with an explosion tank, the lower part of a discharge port is provided with a secondary heat exchanger, a slag discharging device and the like, structures or devices such as a dust catcher, a silencer and the like can be arranged between the discharge port and the heat exchanger according to the production and process requirements, the interior or exterior of the slag processing tank can be additionally provided with structures or devices such as a slag baffle plate, a material homogenizing plate, a wear-resistant lining plate, a material flow regulating valve, a water cooling pipe, a water cooling wall, an anti-explosion structure, a heat preservation structure or a device according to the production and process requirements, the functions of the slag processing tank can, in order to meet various production process requirements, namely the slag treatment tank is not a simple tank, other structures, devices or functions and the like can be added according to needs so as to meet various production process requirements, and when the device with the structure shown in figure 2 is adopted, the slag treatment tank is combined with the explosion tank.

The quantitative water supply device is a quantitative water supply system of the slag tank, can be a piston and water gun type water supply device, is a quantitative pump water supply system, is a water tank quantitative water supply system, meets the step-by-step quantitative water supply requirement in the slag treatment water quenching explosion process through the device, and can be adjusted at any time according to the quantity of the explosion tanks and the process requirement.

The rotary driving device is a driving device for turning the explosion tanks with a deslagging process, and the device can be a motor, a hydraulic driving device, a pneumatic driving device or a gravity driving device, the installation number of the rotary driving device is determined according to the number of the explosion tanks, generally 1/2 or 1/4, and the rotary driving device is cancelled when the structure of FIG. 2 is adopted.

The secondary heat exchanger is a place for further heat exchange of slag and steam after slag granulation, and is a heat exchange process with the prior slag granulation, the heat exchanger is called as the secondary heat exchanger temporarily, the heat exchanger converts output slag and steam into clean steam or hot water for output, the device is a steam, liquid and solid heat exchange boiler commonly used in the existing market or other improved heat exchange devices, can be vertically or horizontally arranged, can be in the structural forms of a fixed tank type, a rotary tank type, a fixed box type, a movable belt type and the like, a heat exchange bed can be a fixed bed, a fluidized bed, a vibrating bed and the like, the heat exchange mode can be direct or indirect heat exchange, a water wall, a water cooling pipe and a wear-resistant lining plate can be arranged in the heat exchange device according to requirements, and the device can also be combined with equipment devices such as a slag treatment tank, a dust remover, a silencer and the like to form a multifunctional composite device, the device can also be an improved heat exchange boiler with a secondary heating device or a low-temperature medium heat exchange boiler adopting refrigerant for heat exchange, and the device can also introduce other waste heat, such as flue gas waste heat of a hot blast stove, into the heat exchange device to participate in the secondary heat exchange process of slag steam so as to realize the purpose of recycling the waste heat.

The lower part or the tail part of the heat exchanger is provided with a slag discharging device which can be a valve, and the discharging device is a combined device formed by the valve and a tank, the valve and a conveyor, the valve and a transport vehicle and the like, and the purpose of slag discharging is realized through the device.

The novel explosive slag treatment process and the novel explosive slag treatment device are combined with a steam slag treatment process device, the slag treatment heat utilization is carried out by utilizing the explosive process of slag entering water, the slag is cooled by the vaporization of water and the overheating process of steam, the slag granulation and the slag heat exchange process are carried out by utilizing the explosion energy while water quenching granulated slag is utilized, the slag granulation is realized, and the heat exchange process of the slag is also realized.

The new slag treatment device is characterized in that the existing slag tank of the blast furnace is improved and put into a closed slag treatment container tank, in order to meet the process requirement of continuous slag treatment, the upper part and the side part of the tank are provided with quantitative feeding devices, the lower part or the middle part of the tank is provided with a quantitative water supply device, the lower part is provided with a secondary heat exchange device, a slag discharging device and the like, and the slag treatment process of continuous input and output is realized through a coordinated and matched working system and method among the devices.

The quantitative feeding device can be combined in various structures, can be combined by a swing chute, a slag turning tank, a slag runner and a slag conveying device, and can be combined by the swing chute, the slag turning tank and the slag runner and then combined with the slag conveying device; the slag conveying device can also adopt various structural forms, such as piston type, turnover bucket type, turnover tank type and rotary valve type, or adopts specially designed feeder, conveyer, rotary tank, rotary groove and the like, and the step-by-step slag conveying process requirements are realized through different structures and configuration forms of the equipment or the device.

The invention has the advantages that:

the novel blast-method slag granulation and heat utilization process combines the blast-method slag granulation principle with the steam-method slag treatment process, utilizes water quenching of slag and crushing of slag in the explosion process, utilizes high pressure in the explosion process to realize rapid heat exchange, realizes the heat exchange process simultaneously in the slag granulation process, has high heat exchange speed and efficiency, simple process equipment, has no direct power input in the whole granulation and heat exchange process, has no transmission part, is convenient to maintain, maintain and use, completes the whole slag granulation and heat exchange process by a set of system devices and a process flow, directly outputs pressurized superheated steam and high-temperature slag, and creates favorable conditions for subsequent heat utilization; the slag granulation and heat exchange processes are carried out in a closed container, and the whole slag treatment process has no input and output of wastes and no environmental pollution; the process utilizes the process principle of a steam method, adopts water as a cooling medium, cools the slag by the processes of water vaporization and steam superheating, mainly takes away the slag heat by superheated steam, does not change the slag property in the slag treatment process, and has no influence on the subsequent utilization of the slag; the process utilizes the vaporization and overheating processes of water to cool the slag, slag heat is discharged by steam, the output steam and slag can exchange heat in various heat exchange modes, the subsequent utilization is convenient, the slag can directly output clean steam for power generation after the heat exchange of a boiler, the steam output with a high exergy value is realized, and the process has the advantages of water saving, energy saving, environmental protection and the like; the device can be installed in front of the blast furnace on site, and can also be installed by a remote special slag treatment plant, so that the installation and the use are convenient; the process device can produce dry slag and granulated slag, can produce superheated steam and saturated steam or slag-water mixture, can be applied to blast furnace slag treatment and steel slag and other metallurgical slag treatment, opens up a new way for metallurgical slag granulation and heat exchange, realizes the full utilization of the waste heat of the metallurgical slag, and has good practical application value.

Further specific advantages are:

1. water conservation: the existing slag treatment methods such as the Lassa method, the INBA method, the round method, the Mingte method, the slag flushing method and the like cool the slag by absorbing heat by water quenching water. The water consumption is large, actual statistical data show that 4000kg of cooling water is needed for smelting one ton of iron by the existing slag treatment method, 1000kg of new water is needed for supplementing each ton of slag, and the slag-water ratio is 1: about 10; the slag granulation process of the explosion method absorbs slag heat by steam and directly changes water into steam, the method has less water consumption, and the ratio of slag to water is 1: less than 0.6, and less than 200kg/t of water consumed by per ton of iron;

2. the energy consumption is low: the existing slag treatment method has the disadvantages that the water consumption is large, the power of a water pump for adding water, circulating, cooling and the like is increased by times, the power of a 2500m3 blast furnace for adding water, circulating, cooling, slag treatment and the like in a certain steel mill is known to be more than 1000kw, the power of the slag treatment process by an explosion method is below 100kw, if the heat utilization part is also taken into consideration, the total power is less than 500kw, and the energy-saving effect is very obvious;

3. the high-efficiency heat utilization of the blast furnace slag is realized: the whole slag treatment process of the process has little other heat loss except the heat dissipation loss of the system, partial heat brought by the slag and the effluent, so the heat efficiency is very high, the total heat efficiency calculated at present is not high because the adopted gas-solid secondary heat exchanger has low efficiency, if the heat efficiency of the secondary heat exchanger can be obviously improved, the total heat efficiency can be obviously improved, the heat efficiency of the slag granulation part is about 95 percent through preliminary calculation, the efficiency of the heat exchange boiler is calculated according to 65 percent, and the total heat exchange efficiency is more than 60 percent;

4. the corrosion to surrounding equipment and the pollution to the atmosphere caused by the existing slag treatment method are avoided:

in the existing slag treatment method, the generated slag water is partially discharged, meanwhile, water is directly contacted with red slag to generate a large amount of steam containing alkaline materials and a large amount of CO2 gas, and the gases are simultaneously mixed with harmful substances such as sulfur dioxide, hydrogen sulfide and the like, so that the gases are freely discharged to cause atmospheric pollution and corrosion to nearby equipment; and the technological process of slag treatment by the explosion method is completely controlled in a closed system, and no environmental pollution is caused by secondary dust removal, so that the method is very suitable for the current situation of energy conservation and emission reduction.

Drawings

FIG. 1 is a schematic view of the explosive slag treatment process and apparatus of the present invention; FIG. 2 is an example of a simple installation application of FIG. 1; FIG. 3 is an exemplary application of the slag handling vessel of FIG. 1 installed with 4 explosive tanks and a dosing device with a combination of a swing chute and a slag delivery device; FIG. 4 is a side-mounted application example of the slag conveyor of FIG. 1 employing a rotating hopper, valve or tank; FIG. 5 is an example of an upper mounting application of the slag conveyor of FIG. 1 using a rotary baiting valve or a rotary baiting bucket; FIG. 6 shows an application example of a slag treatment tank with a circular shape, an explosion tank with two tanks, horizontal installation and symmetrical installation with a tank opening covered.

The invention is further illustrated with reference to the accompanying drawings and the detailed description.

Detailed Description

As shown in fig. 1, the device mainly comprises a slag flowing groove 1, a quantitative feeding device 2, a slag processing tank 3, an explosion tank 4, a quantitative water supply device 5, a rotary driving device 6, a secondary heat exchanger 7, a slag discharging device 8 and the like, wherein the quantitative feeding device 2 generally comprises more than two devices, mainly comprises a slag turning tank 2.1, a swinging chute 2.2 and a slag conveying device 2.3, and belongs to a system device, wherein the quantitative feeding device in fig. 1 adopts a combined form of a buffer slag turning tank, a swinging chute and a piston slag conveying device; the quantitative feeding device in fig. 3 and 6 adopts a combination form of a swinging chute and a piston slag feeding device; the quantitative feeding device in fig. 2, 4 and 5 adopts an application example of a combined structure of a slag turning tank and a slag conveying device such as a piston, a turning bucket, a rotary blanking valve or a turning tank.

The technological process is summarized:

the working process is as follows: among various configuration forms of the slag treatment process and the slag treatment device by the explosion method, the difference between the explosion process and the working process after the explosion tank is small, and the main working process is as follows: the method comprises the steps of firstly adding water into a tank through a quantitative water supply device before tank explosion at each time, enabling blast furnace slag to flow into a quantitative feeding device through a slag channel, feeding the slag into the tank through the quantitative feeding device step by step and quantitatively, enabling the slag to fall into an explosion tank, enabling the slag and the water to be mixed and exploded, enabling slag granulation and heat exchange to be realized by utilizing high pressure in the explosion process, generating high-temperature slag and steam to be output, enabling the slag and the steam to enter a secondary heat exchanger for heat exchange, generating clean steam to be output for heat utilization after the heat exchange of the secondary heat exchanger, changing continuous blast furnace slag feeding into step by step and quantitative feeding meeting the requirements of a slag treatment tank through the step by step and quantitative feeding of the quantitative feeding device and the continuous explosion slag treatment process of the explosion tank, and realizing continuous slag and steam output.

The important point of the description of the explosive slag treatment process and the working process of the device is the working process of the quantitative feeding device, and the working process is slightly different along with the different configuration forms of the quantitative feeding device.

When the structure of fig. 1 is adopted, that is, 2 explosive tanks are adopted, and the vertical and opening are arranged up and down symmetrically, the specific working process is as follows:

the blast furnace slag flows into a buffering slag turning tank through a slag channel, is turned over and poured into a swinging chute through the slag tank, is quantitatively fed in a left-right (or up-down) timing swing mode through the swinging chute, the slag respectively flows into two different cylinder bodies of a piston slag feeding device, is fed into a slag treatment tank through a slag pushing piston and falls into an explosion tank, water is added into the explosion tank through a quantitative water supply device before each explosion according to a specified slag-water ratio, the slag and the water are mixed and exploded to generate an explosion method slag treatment process principle process, the slag can be pushed out of the tank through explosion, the lower slag tank is driven to turn over by a rotary driving device after the explosion for 180 degrees, one tank is turned over, the other tank is turned over to wait for receiving the slag for the next explosion working process, and the slag treatment and the slag turning over are realized along with the left-right swing of the swinging chute, the alternate slag feeding and pushing of the slag feeding device and the continuous explosion and, The steam output process, further speaking, the swinging of the chute, the alternate slag feeding and pushing of the slag feeding device, the continuous explosion and tipping process of the explosion tank and the timed water adding process realize the continuous slag treatment process through a working system of the mutual coordination and coordination of the devices.

In the configuration of fig. 1, the explosion tank opening may also be arranged all the way up, with the same working procedure as above, except that the tank rotation after explosion becomes 360 °. When the structure of FIG. 1 is adopted and the opening of the explosion tank is arranged upwards, the explosion tank can also adopt a single-tank operation mode, namely, one explosion tank is adopted for working, and two slag conveying devices are configured for working.

In the structure of fig. 3, the explosive tank adopts a 4-tank symmetrical arrangement mode, namely two tanks are arranged with openings facing upwards and downwards, the slag feeding device adopts 4 configurations, the driving device can adopt 2 or 4 configurations according to requirements, when the driving device adopts 2 configurations, the working mode is that the explosive tank adopts two tanks for slag feeding and explosion, the two tanks rotate 180 degrees after explosion, and other working modes are the same. Of course, the opening of the explosion tank can be arranged in an upward mode, and the rotation process of the tank after explosion is changed into 360 degrees.

When the structure of fig. 2 is adopted, the structure cancels a rotary driving device, the slag processing tank is combined with the explosion tank, the quantitative feeding device adopts a combination form of tilting the slag tank, pouring slag and sending slag device, and the specific working process is as follows:

the blast furnace comes the sediment through the slag runner to buffering slag ladle, weigh through the slag ladle and overturn and carry out the ration feed, the sediment is to going into in the piston send the sediment device, in pushing away the sediment piston and sending into the sediment treatment tank, fall into the explosion jar, the sediment, the water mixing carries out the explosion sediment processing procedure, one send sediment device work to accomplish the back, the slag ladle is changeed to another and is sent the sediment device feed, send the sediment device into the explosion jar again, carry out sediment processing and heat transfer process, so reciprocating rotation, overturn and send the sediment process, realize continuous sediment processing explosion process. When the tipping slag pot is used for slag separation, the slag conveying device can also adopt 1 setting or one-use one-standby setting according to the requirement.

When the mounting structure of fig. 4 and 5 is adopted, the specific working process is as follows:

the slag from blast furnace is fed into buffer slag tank through slag channel, and is weighed and tilted to make quantitative feeding, the slag is fed into the tilting hopper, tilting valve, rotating blanking valve or tilting tank and blanking tank, and is turned over by means of rotating power device of tank, hopper and valve, and fed into explosion tank, and the slag and water are mixed to make explosion slag treatment process, and after the operation of one slag-feeding device is completed, the explosion tank is turned over for 180 deg. or 360 deg. to make slag-pouring process.

When the installation structure of fig. 6 is adopted, the specific working process is as follows:

the slag from blast furnace is fed into swinging chute via slag channel, and fed quantitatively via the timing swing of swinging chute, the slag is fed into two different cylinders of piston slag feeder, and fed into horizontal explosion tank via telescopic slag pushing piston, the slag pushing piston is retracted, the upper cover of the explosion tank is closed and locked automatically, water is fed into the explosion tank via water feeder, the explosion tank is rotated to mix slag with water to produce great amount of steam, and when the tank reaches preset pressure, the upper cover is opened quickly to release pressure for treating slag with strong explosion The steam output is specifically in this mounting structure, and its explosion jar, push away the installation quantity and the opening orientation of sediment device not fixed, and its specific installation quantity and opening orientation can adjust as required at any time.

In the novel slag treatment process device by the explosion method, the quantitative feeding device, the slag treatment tank and the explosion tank have various configuration forms according to production and process requirements, and when other configuration structural forms are adopted, the working process is similar to that described above, and the process is not repeated too much.

The high-temperature slag and steam output after the slag treatment explosion process further enter a secondary heat exchanger for heat exchange, the pressure is gradually reduced along with the increase of the volume of a flow passage of a heat exchange chamber and the heat exchange and cooling of the slag and the steam, the steam is gradually condensed, condensed water enters the slag, only a small amount of steam is discharged through an outlet, when the temperature of the slag is reduced to be below 200 ℃, the produced water-containing slag is output through a discharging device, and redundant condensed water and steam are emptied or discharged into a water pool after being sprayed with water and condensed through a chimney. The heat loss of the whole system is the heat loss of the system, except the heat dissipation loss, slag discharge and steam loss, and all the blast furnace slag heat is changed into clean steam heat to be output, so the heat efficiency is higher.

The specific slag granulating and heat exchanging process comprises the following steps: the granulation of the slag is mainly finished in an explosion tank and mainly depends on the processes of water quenching and explosion for granulation; the slag heat exchange process is divided into two processes, one is a heat exchange process of granulation of red slag and water and steam, and the other is a secondary heat exchange process of output of high-temperature slag and steam, wherein the first heat exchange process is mainly realized by directly exchanging heat between slag and steam in the water quenching and explosion processes, the second heat exchange process is the heat exchange process of the existing boiler, and the working process of the heat exchange process is the same as that of the heat exchange process of the existing boiler, so the process is not repeated.

The novel slag treatment process by the explosion method is characterized in that slag treatment and heat utilization are carried out by simulating the slag treatment explosion process generated in the existing production, the slag treatment process is carried out in a closed container, the discontinuous explosion process in the production is changed into the continuous explosion process meeting the production requirement, steam is directly generated in the slag treatment process, the slag heat is taken away by virtue of the vaporization and steam overheating processes of water, and the high-temperature steam and the slag are output for heat utilization.

Furthermore, the water adding amount and the slag feeding amount of the explosion tank are matched each time, that is, the water adding amount and the slag feeding amount have a constant proportional relationship, and the water adding amount is generally required to be smaller than the water adding amount when the slag heat is completely converted into saturated steam under the pressure state, that is, the output steam is superheated steam and high-temperature slag, although the water adding amount can also be increased, saturated steam, industrial exhaust steam and water slag are generated at the time, so that the subsequent heat utilization efficiency is influenced, and the water adding amount is generally not used. However, even if saturated steam and industrial exhaust steam are output by the process device and generate hot water through heat exchange of the heat exchange device, the heat utilization efficiency of the process device is much higher than that of the existing slag water heat exchange heating mode, and the process device is worthy of application.

Further, the temperature of the steam and slag output after explosion is determined by the water addition amount, the larger the water addition amount is, the lower the temperature of the slag and the steam is, the faster the cooling heat exchange rate of the slag is, and conversely, the higher the water addition amount is, the slower the slag is, generally speaking, the water addition amount is required to be relatively less and better, so that the temperature of the output superheated steam and the slag can be improved, further the value of secondary heat exchange steam exergy is improved, the total thermal efficiency is improved, but the water addition amount is not too small, the too small amount directly influences the explosion generation process of the slag and the slag granulation effect, generally speaking, the general temperature of the slag and the steam output after explosion is required to be controlled below 800 ℃.

The slag treatment and heat exchange device can be arranged at the front part of the blast furnace as required, and can also be arranged at the far position of the blast furnace as required, when the slag treatment device is arranged at the front part of the blast furnace, slag can directly enter the quantitative feeding device through a slag runner or be poured into the slag conveying device through an intermediate tank for slag treatment; when the slag treatment device is arranged at a far field of the blast furnace, slag is conveyed by a conveying device such as a tank car and the like, the slag is poured into the slag treatment device through an intermediate tank for slag granulation and heat utilization, and generated steam is gathered by the heat accumulator and then enters a generator set for power generation.

Furthermore, under the normal production condition, each blast furnace slag hole is at least provided with one slag processing and granulating device, each two slag holes are at least provided with one secondary heat exchanger device according to the size of the blast furnace and the requirement, and when the slag processing devices are arranged on a far field of the blast furnace, one secondary heat exchanger device can be provided with 1-4 slag processing and granulating devices according to the requirement.

Claims (11)

1. A metallurgical slag granulation and heat utilization device is characterized in that: the device is including flowing slag groove, buffering slag ladle, dosing device, sediment processing jar, explosion jar, ration water supply installation, rotary drive device, secondary heat exchanger and slag discharging device, wherein:

the quantitative feeding device is a system device for changing continuous blast furnace slag feeding into step-by-step and quantitative feeding according to the slag treatment process requirement of an explosion method, and comprises a swing chute, a slag turning tank, a turning hopper, a turning valve, a slag runner and a combination form of the swing chute, the slag turning tank, the turning hopper, the turning valve, the slag runner and the combination form, and the step-by-step quantitative feeding process requirement to the inside of the explosion tank is met through the device and the combination of the device;

the explosion tank is a place for slag-water mixed explosion, is a semi-closed tank body container with an opening at one side, and is a structure formed by improving the prior blast furnace slag tank in order to meet the new metallurgical slag treatment process requirements, the installation quantity of the explosion tank can be determined according to the size of a blast furnace and the production requirements, the tank opening of the explosion tank adopts an upward, horizontal or up-and-down symmetrical arrangement mode or an inclined certain angle for arrangement according to the production process requirements, or adopts a rotating wheel of a 'revolver' and an engine piston type arrangement mode, the explosion tank has the functions of turning over and rotating as required, the slag pouring process is realized by turning over and rotating, the material pouring process is realized in a non-turning way, a valve is arranged at the lower part of the explosion tank for carrying out material discharging, a water cooling wall, a water cooling pipe and a heat insulating layer are arranged at the outer part of the explosion tank according to the production process requirements, the tank opening is also allowed to be covered as required, a valve type cover is additionally arranged, the process of closing the cover to generate sealed water quenching pressure build-up is realized after feeding is realized by additionally arranging the cover, the high-pressure explosion process in the tank is realized by the high-pressure build-up in the tank and the rapid cover opening process of the rapid cover opening device, and the purposes of enhanced granulation and heat exchange are realized by the high-pressure explosion process;

the buffer slag tank is a slag storage tank which is a temporary slag storage device adopted for facilitating slag storage and transportation, or facilitating uniform flow slag pouring and slag treatment processes, the buffer slag tank can be used as a part of a quantitative feeding device for understanding and application in a system device, and can also be used as a temporary slag container independent of the quantitative feeding device for understanding and application, and when a slag runner is directly connected into or indirectly connected into a slag treatment device through other devices, the buffer slag tank can be cancelled;

the slag processing tank is a tank body container for sealing the slag processing explosion process and storing slag, belongs to a pressure container and is manufactured by a pressing force container, and adopts a spherical shape and a cylindrical shape, the upper part or the side surface of the container is provided with a feeding device for step-by-step and quantitative feeding, the interior of the container is provided with an explosion tank, the lower part discharge port is provided with a secondary heat exchanger and a slag discharging device, a dust remover and a silencer are arranged between the discharge port and the heat exchanger according to the production and process requirements, the interior or the exterior of the slag processing tank is provided with a slag baffle plate, a material homogenizing plate, a wear-resistant lining plate, a material flow regulating valve, a water cooling pipe, a water cooling wall and an anti-explosion and heat-insulation structure according to the production and process requirements, or the functions of the slag processing tank are further expanded, the slag processing tank is combined with the structures or the functions, the slag treatment tank can be adjusted according to the production process requirements so as to meet the requirements of the closed slag treatment explosion process and other auxiliary functions, and the tank also allows the slag treatment tank and the explosion tank to be combined into a simple structure device;

the quantitative water supply device is a quantitative water supply system of the slag tank, the quantitative water supply device comprises a piston, a water gun type water supply device, a quantitative pump water supply system and a water tank quantitative water supply system, the device meets the step-by-step quantitative water supply requirement in the slag treatment water quenching explosion process, and the installation quantity of the device can be adjusted at any time according to the quantity of the explosion tanks and the process requirement;

the rotary driving device is a driving device which enables the explosion tank to turn over and rotate and has a slag dumping process, the device is a motor, hydraulic, pneumatic or gravity device, the installation number of the rotary driving device is determined according to the number of the explosion tanks, and when the slag treatment tank and the explosion tanks are combined, the rotary driving device is cancelled when a simple structure device is adopted;

the secondary heat exchanger is a place for further heat exchange of slag and steam after slag granulation, high-temperature slag and steam are output by the heat exchanger and are converted into clean steam or hot water for output, the device is a steam, liquid and solid heat exchange boiler commonly applied in the existing market or other improved heat exchange devices, the structure of the device is a fixed tank type, a rotary tank type, a fixed tank type or a movable belt type, a heat exchange bed of the device is a fixed bed, a fluidized bed or a vibrating bed, the heat exchange mode is direct or indirect heat exchange, a water wall, a water cooling pipe and a wear-resistant lining plate and a cleaning and cleaning structure are arranged in the heat exchange device according to requirements, or a secondary heating device is additionally arranged, the device is also allowed to be combined with a slag treatment tank, a dust remover and a silencer equipment device to form a multifunctional composite device, or a low-temperature medium heat exchange boiler adopting refrigerant for heat exchange, or other waste heat is introduced into the heat exchange device, so as to realize the reutilization of waste heat;

the lower part or the tail part of the heat exchanger is provided with a slag discharging device which is a valve or consists of a valve and a tank, a valve and a conveyor, and a valve and a transport vehicle, and the purpose of slag discharging is realized through the device.

2. The metallurgical slag granulation and heat utilization device as defined in claim 1, wherein the slag conveying device in the device adopts various structural forms, including a piston type slag conveying device, a separately designed rotating hopper, a rotating tank, a rotating groove and a valve type slag conveying device, the requirements of the step-by-step slag conveying process are realized through the devices, and the installation number of the slag conveying devices is determined according to the number of the explosion tanks; when the rear part of the slag runner is provided with a buffer slag pot, namely, the slag runner flows slag into the slag pot, and the slag conveying device operates singly when the slag pot is tipped for deslagging; the swing chute in the device has two structural forms, one is a swing chute which is applied to the existing blast furnace production and can swing in a left-right rotating mode, and the other is a swing chute which is designed through special improvement and can swing up and down in an up-and-down fluctuating mode.

3. A metallurgical slag granulating and heat utilizing apparatus as claimed in claim 1, wherein the apparatus is a combination of an explosion slag treatment process and some apparatuses with a steam slag treatment process apparatus, the slag treatment heat utilization is carried out by using an explosion process of slag in water, the slag is cooled by vaporization of water and a superheating process of steam, the slag granulation and slag heat exchange process is carried out by using explosion energy while the water granulated slag is used, the slag granulation is realized while the heat exchange process of the slag is also realized, the apparatus can output superheated steam and high-temperature slag, and can also output saturated steam, industrial exhaust steam and water slag, the output slag can be dry slag or water slag, or a slag-water mixture, and the slag and steam are converted into steam with a high value of exergy and hot water through boiler heat exchange to be output.

4. The metallurgical slag granulation and heat utilization apparatus as claimed in claim 1, wherein the slag tank of the existing blast furnace is modified and put into a closed slag treatment container tank for slag treatment heat utilization, in order to meet the requirements of the continuous metallurgical slag treatment process, a quantitative feeding device is installed at the upper part or the side part of the tank, a quantitative water supply device is installed at the lower part or the middle part, a secondary heat exchange device and a slag discharging device are installed at the lower part, and the continuous input and output slag treatment process is realized through a coordinated and matched working system and method among the devices.

5. The metallurgical slag granulation and heat utilization device as claimed in claim 1, which is suitable for the field of metallurgical slag granulation and waste heat utilization, when used for blast furnace slag treatment, the slag treatment device can be arranged at the lower part of the blast furnace slag spout according to requirements, and slag can be directly connected into the slag treatment device through a slag runner or poured into the slag treatment device through a buffer tank, and the slag treatment and heat exchange processes are directly carried out in front of the furnace; the slag treatment device can also be arranged in a special slag treatment field far away from the blast furnace according to the requirement, and slag is transported by a tank truck and then poured into the slag treatment device by an intermediate tank for slag treatment and heat utilization.

6. A method of slag granulation and waste heat utilization using the metallurgical slag granulation and heat utilization device of claim 1, the method comprising:

a. the principle of the phenomenon that slag explodes in water and part of devices are applied to a new slag treatment process, the principle of the slag treatment process by a steam method is combined with the actual phenomenon that the slag explodes in water, the slag treatment heat utilization is carried out in the explosion process of the slag entering water, the slag treatment is carried out in a closed container by the principle of the slag treatment process by the steam method, the slag is cooled by the vaporization of water and the overheating process of steam, the slag heat is taken away by the steam, high-temperature slag and steam are directly output, and the slag and the steam are subjected to heat exchange for heat utilization after being output;

b. the slag which often occurs in the production process is exploded in water, the phenomenon process and part of devices are moved into a closed slag treatment tank, the slag treatment heat utilization is carried out by utilizing the explosion process, the method is provided with a quantitative feeding device, the continuous metallurgical slag production feeding is changed into the step-by-step and quantitative feeding which meets the slag treatment process requirement of the explosion method through the quantitative feeding device, the single explosion phenomenon process which often occurs in the production is changed into the continuous explosion slag treatment process which meets the slag treatment process requirement of the metallurgy method, the continuous high-temperature granulated slag and steam output are realized, and the favorable condition is created for the subsequent slag heat utilization;

c. the swing chute, the slag turning tank, the slag runner, the combined device of the swing chute and the slag turning tank and the slag feeding device form a quantitative feeding system, and a continuous explosive slag treatment process in the slag treatment device is realized through a working system and a method of the mutual coordination among the quantitative feeding system, the quantitative water feeding device and the explosive tank, wherein the quantitative feeding device has a simple function which is equivalent to a 'rotating wheel system' of a revolver or a bullet feeding 'cartridge clip system' of an automatic rifle, the continuous shooting of bullets is realized through the 'rotating wheel' and the 'cartridge clip', and the utilization process of continuous slag treatment heat is realized by utilizing the explosion energy through the quantitative feeding device;

d. the method utilizes the explosion process, the explosion can carry out slag treatment heat utilization, utilizes the explosion process to granulate slag, and utilizes the explosion process to realize high-pressure quick heat exchange;

e. the method adopts water as a cooling medium, continues a water quenching steam cooling process of a steam method, utilizes the characteristics of large specific heat of water and steam and much heat absorption in the processes of water vaporization and steam overheating to carry out slag heat exchange, takes away slag heat by steam, directly generates saturated steam, superheated steam and high-temperature slag for output, does not change the property of the slag in the whole slag treatment process, and does not influence the subsequent utilization of the slag;

f. the process can output superheated steam and high-temperature slag, can also output a mixture of saturated steam, industrial exhaust steam and slag water, can generate dry slag and can also generate granulated slag, and one set of system device can meet various process requirements of slag treatment and heat exchange.

7. The method of claim 6, wherein the method is implemented by:

the main working process is as follows:

before the tank explodes, water is added into the tank through a quantitative water supply device, slag from a blast furnace flows to a quantitative feeding device through a slag channel, the slag and the water fall into an explosion tank through the quantitative feeding device in a stepwise and quantitative feeding manner, the slag and the water are mixed to explode, the slag treatment process by an explosion method is realized, the slag granulation and the heat exchange are realized by utilizing the high pressure in the explosion process, high-temperature slag and steam are output, the slag and the steam enter a secondary heat exchanger for heat exchange, clean steam is output for heat utilization after the heat exchange is carried out by the secondary heat exchanger, the continuous blast furnace slag feeding is changed into the stepwise and quantitative feeding meeting the requirements of the slag treatment tank through the stepwise and quantitative feeding of the quantitative feeding device and the continuous explosion slag treatment process of the explosion tank, the continuous slag and steam output is realized through the stepwise and quantitative feeding of the quantitative feeding device, and the working process of the explosion tank is taken as a part of the quantitative feeding, or may be applied separately from a separate part outside the dosing device.

8. The method according to claim 7, when the combination of the slag turning pot, the swing chute and the slag conveying device is used for feeding, the specific working process is as follows:

the blast furnace slag flows into the slag turning tank through the slag channel, is turned over and poured into the swing chute through the slag tank, and is quantitatively fed through the swing chute, the slag respectively flows into two different cylinder bodies of the piston slag feeding device, and is fed into the slag treatment tank through the slag pushing piston, and falls into the explosion tank, water is added in advance through the quantitative water supply device before each explosion according to the specified slag-water ratio in the explosion tank, the slag and the water are mixed to generate explosion, and an explosion method slag treatment process principle process is generated, the slag can be pushed out of the tank through the explosion, when the opening of the explosion tank is arranged in an up-and-down symmetrical mode, the slag tank after the explosion is overturned by 180 degrees, when the opening of the explosion tank is arranged in an up mode, the slag tank after the explosion is overturned by 360 degrees, the slag is poured and is waited to be received, and the next explosion working process is carried out, along with the left-and-right, The tipping realizes the continuous slag treatment and slag and steam output process, and realizes the continuous slag treatment process through the work of the devices and a working system of mutual coordination and coordination;

when the combined form of the swing chute and the slag conveying device is adopted for feeding, the working process is unchanged except that the process of turning over the slag tank is cancelled;

when the combined form of the slag turning tank and the slag conveying device is adopted for feeding, the working process is as follows:

the blast furnace slag flows into a buffer slag tank through a slag channel, quantitative feeding is carried out through weighing and tipping of the slag tank, the slag is poured into a tipping bucket, a tipping valve, a rotary blanking valve, a tipping tank, a blanking tank or a piston slag conveying device, the slag is conveyed into an explosion tank through a slag conveying device by power, the slag and water are mixed to carry out an explosion method slag treatment process, after one slag conveying device finishes working, the slag tank is conveyed to the other slag conveying device for feeding, and the processes of reciprocating rotation, tipping and slag conveying are carried out in such a way, so that a continuous slag treatment process is realized, and other processes are not changed;

the specific granulating and heat exchanging process comprises the following steps:

the granulation of the slag is mainly finished in an explosion tank and mainly depends on the processes of water quenching and explosion for granulation; the slag heat exchange process is divided into two processes, one is a heat exchange process of granulation of red slag and water and steam, and the other is a secondary heat exchange process of output of high-temperature slag and steam, wherein the first heat exchange process is mainly realized by directly exchanging heat between slag and steam in the processes of water quenching and explosion, slag heat is taken away by the processes of vaporization of water and overheating of steam, and the second heat exchange process is the heat exchange process of the existing boiler.

9. The method as claimed in claim 6, wherein the quantity of water added to the explosion tank at each time is matched with the quantity of slag, that is, the quantity of water added to the explosion tank has a constant proportional relationship with the quantity of slag, and the quantity of water added is required to be smaller than that of the explosion tank when the slag heat is completely converted into saturated steam under the pressure state under the normal production condition, that is, the output steam is superheated steam and high-temperature slag.

10. The method as claimed in claim 6, wherein the temperature of the output steam and slag after explosion is determined by the amount of added water, the larger the amount of added water, the lower the temperature of the discharged slag and steam, the faster the cooling and heat exchange rate of the slag, and vice versa, the higher and the slower the amount of added water is required to be relatively smaller under normal production conditions, so as to increase the temperature of the output superheated steam and slag, further increase the exergy value of the secondary heat exchange steam, and increase the total thermal efficiency, but the amount of added water is not too small, and too small directly affects the explosion generation process of the slag and the slag granulation effect.

11. The method according to claim 6, which is suitable for the fields of metallurgical slag granulation and waste heat utilization, when the method is used for blast furnace slag treatment, a slag treatment device can be arranged at the lower part of a blast furnace slag spout according to requirements, and slag can be directly accessed through a slag runner or poured into the slag treatment device through a buffer tank, and the processes of slag treatment and heat exchange are directly carried out in front of a furnace; the slag treatment device can also be arranged in a special slag treatment field far away from the blast furnace according to the requirement, and slag is transported by a tank truck and then poured into the slag treatment device by an intermediate tank for slag treatment and heat utilization.

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