Steel slag disintegrating system

Abstract

The invention relates to the field of environmental protection in the iron and steel industry, and discloses a system for disintegrating steel slag. The system comprises a washing device, a second heat exchanger and a plurality of slag disintegrating units, a slag disintegrating device and a gas collecting device covering the slag disintegrating device are arranged in each slag disintegrating unit; the gas collecting device is used for collecting waste gas and dust generated in the slag disintegrating device; the washing device is used for mixing and contacting the waste gas and dust from the gas collecting device with slurry to obtain purified waste gas and treated slurry, and the treated slurry is conveyed into the slag disintegrating device for use; a first heat exchanger is arranged in the gas collecting device and used for conducting heat exchange on a heat exchange medium and waste gas in the slag disintegrating device, and the heat exchange medium after heat exchange exchanges heat with the purified waste gas in a second heat exchanger. According to the system, dust and steam in the steel slag disintegrating process can be treated, regulated and controlled, the water consumption and energy consumption of the steel slag disintegrating system can be further reduced, and the operation cost of the system is reduced.

Description

Technical Field

[0001] The invention relates to the field of environmental protection in the steel industry, and in particular to a steel slag suffocating system. Background Art

[0002] Slag pit suffocation is a process for separating and recovering scrap steel and other recyclable materials from slag. One ton of slag contains about 12% scrap steel. Liquid slag at 1600℃ is sprayed into 10mm slag with high-pressure water, and the temperature is reduced from 1600℃ to 800℃. It is then poured into the slag suffocation pool, where the temperature can be reduced to 320℃ and the pressure is 0.3MP. After 8 to 12 hours of hot suffocation, it becomes 8 to 10mm slag. Scrap steel is recovered through magnetic separation, and the tailings are used to produce slag powder and cement. This treatment process opens up new ways for the comprehensive utilization of converter slag.

[0003] The specific description of the steel slag smoldering is as follows: after the converter slag is discharged, it is placed in a slag basin, and is lifted by a crane to the slag smoldering pool to dump the slag. When the slag in the smoldering pool meets the requirements (the upper free space is more than 500mm), the smoldering pool cover is closed and the slag is smoldered by spraying water. After the smoldering treatment, the steel slag is cooled to 50℃, the smoldering pool cover is lifted, and the slag is grabbed by an excavator and transported to a car. The smoldering process is: converter slag dumping → slag basin → slow cooling → pit loading → water spraying → lid closing → water spraying → lid opening → slag discharge.

[0004] However, during the steel slag smoldering process, there are serious unorganized atmospheric emissions, mainly in two conditions: first, when the slag basin is tipped over the slag pool to dump slag, 20 to 30 tons of high-temperature steel slag are poured into the slag pool within a few seconds, causing a large amount of high-temperature dust to be instantly raised from the slag pool; second, during the water spraying process, a large amount of steam is released and carries a small amount of dust.

[0005] Although the steel slag hot stuffing process can realize the resource utilization of steel slag and generate huge social and economic benefits, the steam and dust generated during the steel slag hot stuffing process will corrode the factory building and roof, and the roof needs to be replaced regularly. The visibility in the factory building is very low, the working environment is poor, and pollutants are easily emitted from the factory building, becoming one of the key unorganized emission sources of steel enterprises. At the same time, a large amount of water needs to be added during the slag stuffing process, which eventually evaporates and becomes steam and is discharged, which also causes a waste of water resources.

[0006] There is no good way to control the dust and steam emissions during the slag-smothering process. At present, roof-type dust collectors are usually used, that is, dust collection devices are installed on the roof of the slag-smothering pool workshop to suck away the dust and steam in the workshop from the top for treatment. However, this process can only solve the problem of preventing the pollution in the closed factory from escaping. The pollution inside the factory is still serious, and the operating environment cannot be improved. A monorail mobile dust collection hood can also be used to absorb and treat the steam in the slag-smothering process, but this process can only solve the problem of steam emission from the slag-smothering process, but cannot solve the serious dust when the slag basin is tipped over. Summary of the invention

[0007] The purpose of the present invention is to overcome the problems of dust and steam pollution in the steel slag stifling process in the prior art, and to provide a steel slag stifling system, which can seal the dust in the system and prevent it from being discharged. At the same time, the steam generated in the slag stifling process and the waste heat of the steam can be recycled to achieve the control and regulation of dust and steam in the steel slag stifling process, and can further save the water consumption and energy consumption of the steel slag stifling system, thereby saving the system operating costs.

[0008] In order to achieve the above-mentioned object, the present invention provides a steel slag stagnation system on one hand, the system comprising a washing device, a second heat exchanger and a plurality of slag stagnation units;

[0009] The slag-smothering unit is provided with a slag-smothering device and a gas collecting device covering the slag-smothering device;

[0010] The gas collecting device is used to collect the waste gas and dust generated in the slag-suppressing device;

[0011] The washing device is used to mix and contact the waste gas and dust from the gas collecting device with the slurry to obtain purified waste gas and treated slurry, and the treated slurry is transported to the slag suffocating device for use;

[0012] A first heat exchanger is provided in the gas collecting device for exchanging heat between a heat exchange medium and the exhaust gas in the slag simmering device, and the heat exchange medium after heat exchange exchanges heat with the purified exhaust gas in the second heat exchanger.

[0013] Preferably, the slag-smothering unit further includes an exhaust gas fan which is arranged in one-to-one correspondence with the slag-smothering device, and is used to transport the exhaust gas and dust from the gas collecting device to the washing device.

[0014] Preferably, a spray layer is provided in the washing device for spraying slurry to treat the waste gas and dust from the gas collecting device.

[0015] Preferably, the system further comprises a heat exchange medium circulation pump for conveying the heat exchange medium in the second heat exchanger to the first heat exchanger for circulation.

[0016] Preferably, the system is further provided with a blower, and a wind box connected to the blower via an air inlet line;

[0017] The wind box is arranged on the air collecting device and is used to form a downward wind curtain to seal the dust in the slag sealing device within the wind curtain.

[0018] Preferably, a damper corresponding to the wind box is provided on the air inlet pipeline to adjust the flow rate of gas delivered to the wind box by the fan.

[0019] Preferably, the system further comprises a first slurry pump, and a slurry pool is provided at the bottom of the washing device;

[0020] The first slurry pump is used to transport the slurry in the slurry pool to the spray layer for use.

[0021] Preferably, the washing device is provided with an air inlet, so that the exhaust gas and dust from the air collecting device are collected and enter the washing device through the air inlet to be mixed and contacted with the slurry.

[0022] Preferably, the system further comprises a second slurry pump for conveying the treated slurry from the washing device to the slag settling device for use.

[0023] Preferably, the system further comprises a waste slurry control device arranged in one-to-one correspondence with the slag-stifling device, for regulating the flow rate of the treated slurry transported to the slag-stifling device.

[0024] The system described in the present invention is provided with a gas collecting device on the slag-stifling device, so as to collect all the waste gas and dust generated in the slag-stifling process, so as to avoid the dust and waste gas from leaking out and causing pollution, and at the same time, the collected dust and waste gas are transported to the washing device, and the slurry is circulated in the washing device for washing treatment, and the slurry washes and purifies the particulate matter and dust in the waste gas, and the purified gas is obtained after the treatment, and then the treated slurry is returned to the slag-stifling device for use as slag-stifling water, thereby reducing the water consumption in the steel slag-stifling process. At the same time, a first heat exchanger is provided in the gas collecting device, and a heat exchange medium is used to recover the heat carried by the waste gas in the slag-stifling device, and a part of the steam in the waste gas after cooling is condensed into droplets and returned to the slag-stifling device to continue to be used as steel slag-stifling water, further saving water consumption. In addition, the heat exchange medium heated up by heat exchange in the first heat exchanger is continuously transported to the second heat exchanger to exchange heat with the purified gas, so that the temperature of the purified gas is increased and the humidity is reduced, thereby preventing the "white smoke phenomenon" caused by condensation due to high moisture content during gas emission, and at the same time facilitating the rapid dissipation of the gas after emission, further reducing the possibility of local pollution.

[0025] The system of the present invention can effectively reduce the emission of dust and steam in the process of steel slag slagging, and can also reduce the consumption of water resources in the process of steel slag slagging, thereby saving the operating cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1is a schematic diagram of the process flow of the steel slag stagnation system;

[0027] Figure 2 It is a process flow diagram of the air curtain system adopted by the steel slag smothering system.

[0028] Description of Reference Numerals

[0029] 11 slag-suppressing device; 12 gas-collecting device;

[0030] 21 exhaust gas fan; 22 exhaust gas control device;

[0031] 31 air inlet; 32 washing device;

[0032] 33 exhaust pipe of washing device; 41 first slurry pump;

[0033] 42 spray layer; 51 second slurry pump;

[0034] 52 waste slurry control device; 61 first heat exchanger;

[0035] 62 heat exchange medium circulation pump; 63 first heat medium control device;

[0036] 64 second heat exchanger; 65 second heat medium control device;

[0037] 71 fan; 72 damper;

[0038] 73 bellows. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0040] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0041] The process flow chart of the steel slag stagnation system of the present invention can be referred to in conjunction with Figure 1, the steel slag stagnation system includes a washing device 32, a second heat exchanger 64 and a plurality of slag stagnation units. Each of the slag stagnation units is provided with a slag stagnation device 11 and a gas collecting device 12 covering the slag stagnation device 11. The slag stagnation device 11 is used to stagnate the steel slag. Therefore, the slag stagnation device 11 is provided with a material inlet and outlet. The steel slag used for stagnation is fed into the slag through the material inlet and outlet. After the slag stagnation is completed, the slag-stagnated material is discharged through the material inlet and outlet. In particular, in the system described in the present invention, in order to ensure the stable operation of the system, the slag stagnation devices in a plurality of slag stagnation units cannot all be in the slag feeding or discharging state at the same time. When one of the slag stagnation devices 11 is in the slag feeding or discharging state, the remaining slag stagnation devices 11 are in the slag stagnation state.

[0042] In the present invention, the gas collecting device 12 is used to prevent the dust or waste gas in the slag-smothering device 11 from escaping during operation. Specifically, the gas collecting device 12 is used to collect the waste gas and dust generated in the slag-smothering device 11, and then transport the collected waste gas and dust to the washing device 32 for purification.

[0043] In a specific embodiment, when the slag stifling device 11 is in a slag stifling state, the gas collecting device 12 tightly covers the material inlet and outlet of the slag stifling device 11 to prevent dust and waste gas generated during the slag stifling process from escaping and causing pollution; when the slag stifling device 11 needs to load or discharge slag, the gas collecting device 12 is opened to expose the material inlet and outlet of the slag stifling device 11, so as to facilitate the slag stifling device 11 to load or discharge slag from the material inlet and outlet.

[0044] In a preferred embodiment, the slag-smothering unit further includes an exhaust gas fan 21 which is arranged one-to-one with the slag-smothering device 11, and the exhaust gas and dust from the gas collecting device 12 are transported to the washing device 32 for purification through the exhaust gas fan 21. In particular, in the present invention, the exhaust gas and dust from several gas collecting devices 12 are transported by the exhaust gas fan 21, and then aggregated into one stream and transported to the washing device 32 for purification. It can be understood that the number of the exhaust gas fans 21 is equal to the number of the slag-smothering devices 11, and the exhaust gas fans 21 are connected to the slag-smothering devices 11.

[0045] In a specific embodiment, in order to control the flow rate of the exhaust gas and dust delivered to the washing device 32 by the gas collecting device 12, an exhaust gas regulating device 22 is provided on the connecting pipeline between the exhaust gas fan 21 and the washing device 32, and the flow rate of the exhaust gas and dust delivered to the washing device 32 can be adjusted by adjusting the exhaust gas regulating device 22 according to the working conditions. Preferably, in order to facilitate the adjustment of the flow rate of the exhaust gas and dust delivered to the washing device 32 by each gas collecting device 12, the exhaust gas regulating device 22 is limited to be set in a one-to-one correspondence with the exhaust gas fan 21, and the number of the two is equal.

[0046] In the present invention, the washing device 32 is used to mix and contact the waste gas and dust from the gas collecting device 12 with the slurry to obtain purified waste gas and treated slurry, and the treated slurry is transported to the slag suffocating device 11 for use. Specifically, the washing device 32 can be a washing tower, and a slurry pool is provided at the bottom of the washing device 32.

[0047] Specifically, a spray layer 42 is provided in the washing device 32, and a plurality of spray devices are provided on the spray layer 42 for spraying slurry. The sprayed slurry is used to wash and purify particulate matter and dust in the exhaust gas from the gas collecting device 12 to obtain purified gas.

[0048] More specifically, a washing device exhaust pipe 33 is provided on the top of the washing device 32 for discharging the gas purified in the washing device 32 .

[0049] In a preferred embodiment, an air inlet 31 is provided on the washing device 32, so that the exhaust gas and dust from the gas collecting device 12 are collected and enter the washing device 32 through the air inlet 31 to mix and contact with the slurry sprayed by the spray layer 42, so that the slurry absorbs the particulate matter in the powder and exhaust gas to obtain purified gas.

[0050] In a preferred embodiment, the system further comprises a first slurry pump 41, and the first slurry pump 41 is used to transport the slurry in the slurry pool to the spray layer 42 for use.

[0051] In a specific embodiment, in the washing device 32, the slurry in the slurry pool is pumped into the spray layer 42 through the first slurry pump 41 to treat the waste gas and dust. The treated slurry will continue to fall into the slurry pool, and then continue to be circulated through the first slurry pump 41. After the system runs for a period of time, when the solid content of the treated slurry in the slurry pool increases, the washing and purification effect is weakened, and the treated slurry can be selected to be transported in whole or in part to the slag-smothering device 11 for use as slag-smothering water. When it is selected to transport part of the treated slurry to the slag-smothering device 11 for use, the remaining part of the treated slurry is mixed with the fresh slurry input from the outside and then continues to be transported to the spray layer 42 for circulated use through the first slurry pump 41. When it is selected to transport all the treated slurry to the slag-smothering device 11 for use as slag-smothering water, the fresh slurry input from the outside is injected into the slurry pool, and then transported to the spray layer 42 for use through the first slurry pump 41.

[0052] In a specific embodiment, the system also includes a second slurry pump 51, which is used to transport the treated slurry in the slurry pool to the slag stewing device 11 for use as slag stewing water, thereby further saving the water consumption of the system. At the same time, the treated slurry transported to the slag stewing device 11 undergoes the slag stewing process, and the particulate matter contained therein becomes one with the steel slag. Therefore, it also avoids the secondary pollution caused by the discharge of the treated slurry and sludge, ensures that no pollutants are discharged during the steel slag stewing process, and further reduces the pollution risk of steel slag stewing.

[0053] Specifically, the treated slurry from the slurry pool is pressurized by the second slurry pump 51 and then divided into several streams which are respectively transported to several slag sterilizing devices 11 for use.

[0054] In the present invention, the system further includes a waste slurry control device 52, which is arranged one-to-one with the slag-stifling device 11 and is arranged on the connecting pipeline between the second slurry pump 51 and the slag-stifling device 11, and is used to control the flow rate of the treated slurry transported to any of the slag-stifling devices 11. It can be understood that the number of the waste slurry control devices 52 is equal to the number of the slag-stifling devices 11.

[0055] During the slag smoldering process, the high-temperature slag evaporates water to produce a large amount of water vapor, carrying a large amount of heat. Therefore, the exhaust gas generated in the slag smoldering device 11 has a very high temperature. The prior art does not recycle the heat carried in this exhaust gas, resulting in a large degree of energy waste. Therefore, a first heat exchanger 61 is provided in the gas collecting device 12 described in the present application, which is used to exchange heat between the heat exchange medium and the exhaust gas in the slag smoldering device 11, so that the temperature of the exhaust gas is reduced and the temperature of the heat exchange medium is increased; then the heat exchange medium after heat exchange is combined and continuously transported to the second heat exchanger 64 for heat exchange with the purified gas from the washing device 32, so that the temperature of the purified gas is increased, and the heated gas is discharged into the atmosphere through the exhaust pipe 33 of the washing device. The heat exchange medium after cooling in the second heat exchanger 64 is divided into several streams and returned to the first heat exchanger 61 for recycling.

[0056] In some specific embodiments, the heat exchange medium may be a medium commonly used for heat exchange in the art, and its composition is not particularly limited herein.

[0057] In some specific embodiments, the system further includes a heat exchange medium circulation pump 62 , and the heat exchange medium after heat exchange and temperature reduction in the second heat exchanger 64 is transported to the first heat exchanger 61 through the heat exchange medium circulation pump 62 for circulation.

[0058] In a specific embodiment, the system further includes a first heat medium control device 63 for controlling the flow of the heat exchange medium delivered to the second heat exchanger 64. Specifically, the first heat medium control device 63 can be a valve commonly used in the art for controlling liquid flow.

[0059] In a specific embodiment, the system further includes a second heat medium control device 65, which is used to control the flow rate of the heat exchange medium returned to the first heat exchanger 61. Specifically, the second heat medium control device 65 can be a valve commonly used in the art to control the flow rate of liquid. It can be understood that the first heat medium control device 63 and the second heat medium control device 65 are arranged in a one-to-one correspondence, and the first heat medium control device 63 and the second heat medium control device 65 are both arranged in a one-to-one correspondence with the first heat exchanger 61.

[0060] In the present invention, the second heat exchanger 64 is disposed inside the washing device 32. Specifically, the heat exchange medium from the first heat exchangers 61 after heat exchange is collected and transported to the second heat exchanger 64 for heat exchange with the purified gas, and the heat exchange medium after heat exchange and temperature reduction in the second heat exchanger 64 is pressurized by the heat exchange medium circulation pump 62, and then divided into several streams and transported to the first heat exchanger 61 for circulation and reuse.

[0061] In a preferred embodiment, in order to further control the pollution caused by dust when slag is fed into the slag-suppressing device 11, an air curtain system is also provided in the system of the present invention. Figure 2 The air curtain system comprises a fan 71, a damper 72 and a wind box 73, and the damper 72 is arranged in a one-to-one correspondence with the wind box 73. The wind box 73 is connected to the fan 71 through an air intake line.

[0062] Specifically, the wind box 73 is arranged at the cover of the gas collecting device 12 and the slag suffocating device 11 (the specific arrangement position can be combined with reference to Figure 2 ), the wind box 73 draws air from the fan 71 through the air inlet pipeline, and then ejects the introduced air from the air outlet provided in the wind box 73 to form a downward wind curtain, so as to seal the dust raised in the slag-blocking device 11 within the wind curtain, thereby preventing the dust from leaking out. When the fan 71 is required to send air to the wind box 73 to form a wind curtain, the high-pressure airflow generated by one fan 71 can be evenly divided into several streams, and transported to the wind box of the slag-blocking device 11 after the damper 72 is opened through the corresponding air inlet pipelines to form a wind curtain.

[0063] In the present invention, the damper 72 is arranged on the air inlet line connecting the fan 71 and the wind box 73, and the damper 72 is used to adjust the size of the gas flow delivered to the wind box by the fan 71. Specifically, only when the slag-stifling device 11 is in the slag-feeding or slag-discharging state, the gas collecting device 12 is opened, and the material inlet and outlet of the slag-stifling device 11 are exposed, the damper 72 is in the open state, at which time the fan 71 will send air to the wind box 73, and the wind box 73 will spray the introduced air downward to generate a downward wind curtain, thereby sealing the dust raised in the slag-stifling device 11 during the slag-feeding or slag-discharging process in the wind curtain to avoid pollution.

[0064] In the system described in the present invention, the gas collecting device 12 is used as the "pool cover" of the slag-stifling device 11, so as to realize the whole process of adsorption during the slag feeding, slag discharging and slag-stifling process, and prevent the environmental pollution caused by the leakage of waste gas and dust; at the same time, the system further arranges wind boxes on both sides of the slag-stifling device 11, and adopts a fan to send air into the wind boxes to form an air curtain system, so as to further avoid the pollution caused by the emission of dust and waste gas during the slag feeding and slag discharging process; in addition, in the system described in the present invention, a first heat exchanger 61 is also arranged in the gas collecting device 12 to recover the heat of the high-temperature waste gas generated in the slag-stifling process, and a second heat exchanger 64 is arranged to heat the purified gas with the recovered heat , avoiding the "white smoke" phenomenon caused by gas emissions, and recovering the waste heat of the slag-stifling process while avoiding secondary pollution; at the same time, the system described in the present invention further transports the treated slurry after washing the waste gas and dust in the washing device 32 to the slag-stifling device 11 for use as slag-stifling water, further saving the water consumption of steel slag stifling, and the treated waste water transported to the slag-stifling device 11 contains a large amount of dust and particulate matter, which can become one with the steel slag after the slag-stifling process, thereby avoiding the discharge of polluted concentrate and sludge, so that the system described in the present invention does not have any pollutant emissions, and truly achieves the goal of green environmental protection.

[0065] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto.

[0066] Example 1.

[0067] The process flow chart of the system used in Example 1 can be combined with reference to Figure 1 The adopted system contains 4 slag-stifling units, each of which is provided with a slag-stifling device 11, a gas collecting device 12, an exhaust gas fan 21 and an exhaust gas regulating device 22. The second heat exchanger 64 is arranged inside the washing device 32, and the wind box is arranged at the cover of the slag-stifling device 11 and the gas collecting device 12; the 4 slag-stifling devices 11 in the system are all in a slag-stifling state.

[0068] The operation process of the system is as follows:

[0069] The exhaust gas regulating device 22 is turned on, and the exhaust gas and dust generated by the slag suffocation in the slag suffocation device 11 are collected by the gas collecting device 12, and then the exhaust gas and dust collected in the gas collecting device 12 are transported by the exhaust gas fan 21, and then merged and enter the washing device 32 from the air inlet 31;

[0070] The slurry in the slurry pool at the bottom of the washing device 32 is pumped into the spray layer 42 through the first slurry pump 41 to treat the waste gas and dust, thereby obtaining purified waste gas and treated slurry;

[0071] The waste slurry control device 52 is turned on, the treated slurry is pressurized by the second slurry pump 51, and then split into four streams and respectively transported to four slag-suppressing devices 11 for use;

[0072] The first heat medium control device 63 and the second heat medium control device 65 are turned on. In the first heat exchanger 61 provided in the gas collecting device 12, the heat exchange medium exchanges heat with the exhaust gas in the slag suffocating device 11. The four heat exchange mediums that have been heated up by heat exchange are collected and transported to the second heat exchanger 64 for heat exchange with the purified gas. The heat exchange medium that has been cooled down by heat exchange in the second heat exchanger 64 is pressurized by the heat exchange medium circulation pump 62, and then divided into four streams and transported to the four first heat exchangers 61 respectively for recycling. The gas that has been heated up by heat exchange is discharged to the atmosphere through the exhaust pipe 33 of the washing device.

[0073] When a slag-suppressing device 11 in the system is in a slag-discharging or slag-intake state, the air curtain system of the slag-suppressing device 11 is turned on. The process flow chart of the air curtain system can be combined with reference to Figure 2 ;

[0074] At this time, the waste gas control device 22, the waste slurry control device 52, the first heat medium control device 63 and the second heat medium control device 65 corresponding to the slag suffocating device 11 are turned off;

[0075] The air collecting device 12 is opened to expose the material inlet and outlet of the slag sealing device 11, and then the damper 72 corresponding to the bellows 73 is opened, and the fan 71 is started. The bellows 73 at the covering place of the air collecting device 12 and the slag sealing device 11 draw air into the fan 71, and then the air is sprayed out through the outlet of the bellows 73 to form a downward wind curtain, so that the dust raised in the slag sealing device 11 is sealed in the wind curtain to prevent leakage.

[0076] The system described in the present invention can process the dust and waste gas emissions generated in the steel slag slag stifling process, achieve "zero" emissions of dust and waste gas in the steel slag stifling process, solve the environmental pollution and other problems caused by the steel slag stifling process, and can also save water consumption in the steel slag stifling process, and better recover the waste heat in the steel slag stifling process, thereby achieving the purpose of energy saving while controlling pollution.

[0077] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A steel slag slagging system, characterized in that: The system comprises a washing device (32), a second heat exchanger (64) and a plurality of slag-simmering units; Each of the slag-smothering units is provided with a slag-smothering device (11) and a gas collecting device (12) covering the slag-smothering device (11); The gas collecting device is used to collect the waste gas and dust generated in the slag-suppressing device (11); The washing device (32) is used to mix and contact the waste gas and dust from the gas collecting device (12) with the slurry to obtain purified waste gas and treated slurry, and the treated slurry is transported to the slag suffocating device (11) for use; A first heat exchanger (61) is provided in the gas collecting device (12) for exchanging heat between a heat exchange medium and the exhaust gas in the slag simmering device (11); the heat exchange medium after heat exchange is then exchanged with the purified exhaust gas in the second heat exchanger (64).

2. The steel slag smoldering system according to claim 1, characterized in that: The slag-smothering unit also includes an exhaust gas fan (21) which is arranged in a one-to-one correspondence with the slag-smothering device (11) and is used to transport the exhaust gas and dust from the gas collecting device (12) to the washing device (32).

3. The steel slag smoldering system according to claim 1, characterized in that: The washing device (32) is provided with a spray layer (42) for spraying slurry to treat the waste gas and dust from the gas collecting device (12).

4. The steel slag smoldering system according to claim 1, characterized in that: The system further comprises a heat exchange medium circulation pump (62) for conveying the heat exchange medium in the second heat exchanger (64) to the first heat exchanger (61) for circulation.

5. The steel slag smoldering system according to claim 1, characterized in that: The system is further provided with a fan (71), and a wind box (73) connected to the fan (71) via an air intake line; The wind box (73) is arranged on the air collecting device (12) and is used to form a downward wind curtain to seal the dust in the slag-smothering device (11) within the wind curtain.

6. The steel slag smothering system according to claim 5, characterized in that: The air inlet pipeline is provided with a damper (72) corresponding one-to-one to the wind box (73) for regulating the flow rate of gas delivered by the fan (71) to the wind box (73).

7. The steel slag smoldering system according to claim 1 or 3, characterized in that: The system further comprises a first slurry pump (41), and a slurry pool is provided at the bottom of the washing device (32); The first slurry pump (41) is used to transport the slurry in the slurry pool to the spray layer (42) for use.

8. The steel slag smoldering system according to claim 1 or 7, characterized in that: The washing device (32) is provided with an air inlet (31), so that the waste gas and dust from the gas collecting device (12) are collected and enter the washing device (32) through the air inlet (31) to be mixed and contacted with the slurry.

9. The steel slag smoldering system according to claim 1, characterized in that: The system further comprises a second slurry pump (51) for conveying the treated slurry from the washing device (32) to the slag settling device (11) for use.

10. The steel slag smoldering system according to claim 9, characterized in that: The system further comprises a waste slurry control device (52) arranged in one-to-one correspondence with the slag-suppressing device (11), and used for regulating the flow rate of the treated slurry transported to the slag-suppressing device (11).

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