CN215628047U - Normal-pressure hot-disintegrating steel slag and waste heat recovery system by reverse water immersion method - Google Patents
Normal-pressure hot-disintegrating steel slag and waste heat recovery system by reverse water immersion method Download PDFInfo
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- CN215628047U CN215628047U CN202121830455.8U CN202121830455U CN215628047U CN 215628047 U CN215628047 U CN 215628047U CN 202121830455 U CN202121830455 U CN 202121830455U CN 215628047 U CN215628047 U CN 215628047U
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Abstract
The utility model relates to a reverse water immersion method normal pressure hot disintegrating steel slag and waste heat recovery system, which comprises a slag disintegrating device and a waste heat recovery device connected with the slag disintegrating device; the slag disintegrating device comprises a solid slag tank, a water supply and drainage device communicated with the bottom of the solid slag tank and a water-cooling dust hood arranged above the solid slag tank; the waste heat recovery device comprises a waste heat boiler connected with the water-cooling dust hood through a water-cooling flue, a spray tower, a dehydrator, a wet electronic dust removing tower, a dust removing fan and a clean gas emission tower which are sequentially connected are communicated with a low-temperature flue gas pipeline of the waste heat boiler, the dust removing fan is dragged through a steam turbine, and the saturated steam pipeline of the waste heat boiler is connected with the steam turbine. The utility model can improve the temperature of the steel slag entering the tank, fully utilizes the waste heat of the hot steel slag, effectively treats and recycles combustible gas generated in the slag smoldering process, and is safe and energy-saving.
Description
Technical Field
The utility model relates to a normal-pressure hot stuffy steel slag and waste heat recovery system by a reverse water immersion method.
Background
The steel slag is a byproduct in the steel smelting process, the yield of the steel slag is about 12-14% of the yield of crude steel, and the annual yield of the steel slag in China currently reaches about 1.5 hundred million tons. The steel slag contains a certain amount of iron metal elements, and the recovered metal iron has great economic value for metallurgical enterprises. The steel slag also contains a large amount of unstable substances such as free magnesium oxide (f-MgO) and free calcium oxide (f-CaO), and the characteristic that the volume can be seriously expanded when the steel slag reacts with water is not favorable for recycling the steel slag. The temperature of the liquid steel slag is as high as 1400-1600 ℃, and the waste heat recovery value is high.
The hot smoldering steel slag is the main mode for pretreating the steel slag, namely, the steel slag is put into a containerThe high-temperature steel slag is injected with water to pulverize the steel slag, so that the aim of separating iron from slag is fulfilled. At the same time, free f-CaO and f-MgO form stable Ca (OH) through hydration reaction2And Mg (OH)2And conditions are created for recovering the metallic iron and secondarily utilizing the tailings.
At present, the hot stuffiness steel slag mode in China mainly comprises tank type hot stuffiness and tank type pressure hot stuffiness, the water injection mode is upper spraying, and an effective collecting means for sensible heat of high-temperature steel slag is lacked.
1. Pool type hot stuffy
The hot stuffy pool is the main process equipment for pool stuffy treatment of the steel slag, and the existing hot stuffy pool has the following problems:
(i) in the process of pouring the liquid steel slag, a crown block is needed to hoist the liquid steel slag tank to the upper part of the hot stuffy pool to pour the liquid steel slag, then a small amount of water is pumped to cool the liquid steel slag to form a solid state, and in order to accelerate the cooling speed of the liquid steel slag, the water is pumped while an excavator is needed to mix, turn and smash the steel slag poured into the pool. Because the overhead traveling crane and the excavator participate in the operation, a small-range closed space is not easily formed above the hot stuffy pool, and a large amount of steam and smoke dust generated in the process are difficult to effectively collect.
(ii) The slag pouring and the slag discharging time are long. At present, the slag pouring and the slag filling into a pool need 9 hours, the slag sealing is carried out for more than 24 hours, the slag discharging needs 2-3 hours by using an excavator, and the whole slag sealing process needs about 36 hours.
(iii) In order to shorten the slag disintegrating time, tank type hot disintegrating generally needs to be covered, and combustible gas formed in the water injection process is easy to aggregate to generate explosion through water seal sealing.
2. Pot-type hot stuffy bag with pressure
Each slag smoldering tank consists of a solid tank on the inner layer and an autoclave on the outer layer, the solid tank is a steel slag container and is placed in the autoclave on the outer layer, the autoclave is sealed by a cover, water vapor is kept in the autoclave at a pressure of 0.2-0.4 MPa after water is injected, and saturated steam with a certain pressure can accelerate the digestion reaction of the steel slag. The existing pot type pressure hot stuffiness has the following problems:
(i) the investment is huge. The pressure kettle belongs to a pressure container, and has high manufacturing difficulty and high operation cost.
(ii) AnThe whole hidden danger is prominent, and the pressure kettle has the danger of explosion. After the process is put into the market, a plurality of pressure kettle explosion accidents occur. The explosion causes two kinds: firstly, the pressure in the kettle is controlled too much, which causes the pressure vessel to burst. Secondly, the temperature of the steel slag filled into the slag tank is too high, and CO and H generated by water in the water injection process2When the combustible gas is accumulated to a certain concentration in the closed container, the temperature reaches the ignition point of the combustible gas and explosion is generated. Therefore, the temperature of the steel slag at 1200-1400 ℃ needs to be reduced to below 600 ℃ in the previous process, which causes large dust-generating smoke in the previous process, large dust-removing energy consumption, long treatment time and low treatment efficiency.
(iii) Cooling water is sprayed from the upper part of the solid slag tank, water is naturally drained from a drain hole at the lower part, cooling water needs to be continuously supplemented to ensure that enough steam is generated, steel slag is rapidly cooled due to continuous injection of cold water, the generation amount of water vapor is reduced along with the cooling of the steel slag, pressure maintaining in the high-pressure kettle is not facilitated, and the pressure maintaining time in the high-pressure kettle in actual production is only 60-90 minutes. The effect of the steam pressure is not fully exerted.
(iv) The cooling water at the initial stage of spraying can not reach the bottom of the slag pot, and the steel slag at the bottom can not generate digestion reaction. Meanwhile, the temperature difference exists between the water temperature in the high-pressure kettle from top to bottom, the slag smoldering effect is not uniform, and the slag smoldering effect is particularly obvious in a large-volume slag tank.
(v) Steam generated by slag smoldering contains a large amount of combustible gas such as hydrogen, carbon monoxide and the like and particulate matters, and is difficult to collect and utilize.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide the normal-pressure hot stuffy steel slag and the waste heat recovery system which can improve the temperature of steel slag entering a tank, fully utilize the waste heat of hot steel slag, effectively treat and recycle combustible gas generated in the slag stuffy process, and are safe and energy-saving by a reverse water immersion method.
The utility model adopts the following technical scheme:
a reverse water immersion method normal pressure hot disintegrating steel slag and waste heat recovery system comprises a slag disintegrating device and a waste heat recovery device connected with the slag disintegrating device; the slag disintegrating device comprises a solid slag tank, a water supply and drainage device communicated with the bottom of the solid slag tank and a water-cooling dust hood arranged above the solid slag tank; the waste heat recovery device comprises a waste heat boiler connected with the water-cooling dust hood through a water-cooling flue, a spray tower, a dehydrator, a wet electronic dust removing tower, a dust removing fan and a clean gas emission tower which are sequentially connected are communicated with a low-temperature flue gas pipeline of the waste heat boiler, the dust removing fan is dragged through a steam turbine, and the saturated steam pipeline of the waste heat boiler is connected with the steam turbine.
The solid slag tank comprises a tank body with an opening at the top, a water supply and drainage port arranged at the bottom of the tank body, and a spherical overflow cover which is arranged at the upper part of the water supply and drainage port and is fixedly connected with the bottom surface of the tank body, wherein the spherical overflow cover is provided with long holes, the long holes are arranged in a circular array, and the top of the spherical overflow cover is provided with a screen.
The water supply and drainage device comprises a water supply and drainage pipeline connected with the water supply and drainage port, a quick connector is arranged at the end part of the water supply and drainage pipeline and is connected with a water supply pipe through a hose, and the water supply pipe is communicated with a drainage branch pipe.
The water supply system comprises a water supply pipe, a water discharge branch pipe, a water supply pipe, a water discharge pipe, a water supply pipe and a water supply pipe, wherein the water supply pipe is provided with a pipeline pump and a water discharge electric butterfly valve and communicated with the water discharge tank, the water supply pipe is sequentially provided with an electric adjusting valve, a ball valve, an electromagnetic flow meter, a water supply electric butterfly valve, a check valve and a horizontal water pump, and the horizontal water pump is communicated with the water supply tank.
Wherein, be provided with radar level gauge and far infrared thermoscope on the jar body.
Wherein, the disintegrating slag device of more than 4 is connected waste heat recovery device jointly.
The utility model has the beneficial effects that:
1. for the vexed sediment of pond formula, realized whole slag treatment process's airtight operation, realized that whole flue gas discharges in order, cooperate dust pelletizing system to accomplish the ultralow emission standard of particulate matter completely.
2. Compared with the pressure hot stuffiness, the pressure vessel is cancelled, and the equipment investment and the equipment operating cost are greatly reduced.
3. Compared with two modes of tank type slag smoldering and pressure hot smoldering, the potential explosion hazard is thoroughly eliminated.
4. The heat of the chemical reaction of combustible gas combustion is fully utilized, and the power consumption of the system is reduced.
5. Because combustible gas explosion hidden danger does not exist, the temperature of the steel slag entering the solid-state tank does not need to be controlled deliberately, the production capacity of cooling and crushing the steel slag in the previous procedure is liberated, and the production efficiency of the whole slag smoldering workshop is improved. Moreover, the higher temperature of the steel slag can ensure that the digestion reaction is more thorough.
6. Compared with the pressure hot stuffiness, the temperature of the steel slag entering the solid tank can be increased by more than 200 ℃, the dust generation smoke gas quantity of the cooled and crushed steel slag in the previous procedure is greatly reduced, the power consumption and the water consumption of dust removal in the previous procedure are reduced, and the heat recovery rate of the utility model is increased.
On the basis of fundamentally solving the problem of environment-friendly discharge in the slag smoldering process, the temperature of the steel slag entering the tank is increased, the waste heat of hot steel slag is more fully utilized, and simultaneously, combustible gas generated in the slag smoldering process is effectively treated and recycled, so that not only is the potential explosion hazard eliminated, but also the effects of energy conservation and consumption reduction are obvious.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic structural diagram of a solid slag tank and a water supply and drainage device.
FIG. 3 is a flowchart of the method of example 2.
Wherein, 1 water-cooling dust collecting hood, 2 water-cooling flue, 3 exhaust-heat boiler, 4 low-temperature flue gas pipeline, 5 spray tower, 6 dehydrator, 7 wet-type electronic dust removing tower, 8 dust removing blower, 9 purified gas discharging tower, 10 steam turbine, 11 saturated steam pipeline, 12 tank body, 13 water supply and drainage port, 14 spherical overflow cover, 15 long hole, 16 screen, 17 water supply and drainage pipeline, 18 quick joint, 19 hose, 20 water supply pipe, 21 water drainage branch pipe, 22 pipeline pump, 23 water drainage electric butterfly valve, 24 water drainage pool, 25 electric regulating valve, 26 ball valve, 27 electromagnetic flowmeter, 28 water supply electric butterfly valve, 29 check valve, 30 horizontal water pump, 31 water supply pool, 32 radar liquid level meter, 33 far infrared thermometer, 34 smoke collecting pump.
Detailed Description
The utility model will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1-2, a reverse water immersion method normal pressure hot disintegrating steel slag and waste heat recovery system comprises a slag disintegrating device and a waste heat recovery device connected with the slag disintegrating device; the slag disintegrating device comprises a solid slag tank, a water supply and drainage device communicated with the bottom of the solid slag tank and a water-cooling dust cage 1 arranged above the solid slag tank; waste heat recovery device include with waste heat boiler 3 that water-cooling dust cage 1 passes through water-cooling flue 2 and connects, spray column 5, dehydrator 6, wet-type electron gas wash tower 7, dust exhausting fan 8 and the clean gas emission tower 9 that the low temperature flue gas pipeline 4 intercommunication of waste heat boiler 3 connected gradually, dust exhausting fan 8 drags through steam turbine 10, steam turbine 10 is connected to waste heat boiler 3's saturated steam conduit 11. And a smoke collecting pump is arranged on the water-cooling flue and pumps the high-temperature smoke collected by the water-cooling dust collecting cover into the waste heat boiler through the water-cooling flue.
The utility model is different from the traditional water injection mode of spraying hot stuffy steel slag from the upper part of the slag tank, and realizes water injection at the bottom of the slag tank through the device. The method does not need an external pressure container, and achieves the purpose of accelerating the digestion reaction of free calcium oxide and free magnesium oxide in the steel slag by using steaming and water boiling modes. The solid slag pot is not covered and not sealed, so that combustible gas can be completely combusted on the surface of the steel slag, and the explosion hidden trouble is eliminated. The combustible gas can generate high-temperature flue gas with the temperature of over 800 ℃ by combustion, and clean supersaturated steam is produced by the waste heat recovery device and is used for pneumatic dragging of the dust removal fan, so that the energy-saving purpose is achieved.
The solid slag tank comprises a tank body 12 with an opening at the top, a water supply and drainage port 13 arranged at the bottom of the tank body 12, and a spherical overflow cover 14 arranged at the upper part of the water supply and drainage port 13 and fixedly connected with the bottom surface of the tank body 12, wherein the spherical overflow cover 14 is provided with long holes 15, the long holes 15 are arranged in a circular array, and the top of the spherical overflow cover 14 is provided with a screen 16. After the solid steel slag is filled into the tank body, the spherical overflow cover supports the bottom of the tank body, so that the water supply is facilitated to be uniformly distributed during water supply, and local uneven cooling and heating are prevented. When draining, can prevent that local slag from falling into to cause the jam for water drainage pipeline.
The water supply and drainage device comprises a water supply and drainage pipeline 17 connected with the water supply and drainage port 13, wherein a quick joint 18 is arranged at the end part of the water supply and drainage pipeline 17, a water supply pipe 20 is connected with the water supply pipeline through a hose 19, and a drainage branch pipe 21 is communicated with the water supply pipe 20. The water supply and drainage pipe is fixedly connected with the solid slag tank, and the quick connector and the hose can conveniently and quickly connect the water supply pipe with the water supply slag tank.
The water discharging branch pipe 21 is provided with a pipeline pump 22 and a water discharging electric butterfly valve 23 and communicated with a water discharging pool 24, the water feeding pipe 20 is sequentially provided with an electric adjusting valve 25, a ball valve 26, an electromagnetic flowmeter 27, a water feeding electric butterfly valve 28, a check valve 29 and a horizontal water pump 30, and the horizontal water pump 30 is communicated with a water feeding pool 31. The tank body 12 is provided with a radar liquid level meter 32 and a far infrared temperature measuring instrument 33. The devices can be automatically controlled by a single chip microcomputer or a PLC. The pipeline pump is arranged on the drainage branch pipe, so that quick drainage can be realized.
More than 4 slag disintegrating devices are connected with the waste heat recovery device together. Pure steam generated by the slag smoldering devices can completely drive the dust removal fan to do work.
Example 2
As shown in fig. 3, the method for recovering normal-pressure hot smoldering steel slag and waste heat by using the system of embodiment 1 comprises the following steps:
(a) the crushed steel slag with the temperature of over 800 ℃ is filled into a solid slag tank.
On the premise that molten steel slag forms a solid state, the higher the temperature is, the more favorable the slag smoldering and waste heat recovery effects are improved; the bottom of the solid slag pot is provided with a water supply and drainage device which is anti-blocking and leak-proof, and can ensure that the cooling water is not blocked in the process of entering and discharging the solid slag pot.
(b) Placing the solid slag tank on a station by using a crane, connecting a water supply pipe by using a quick connector hose, and supplying water from the bottom of the solid slag tank to the inside of the solid slag tank by using a water supply and drainage device according to a water supply flow curve until the water level is 100mm higher than the steel slag;
and the water supply flow curve is preset according to experimental data and corrected according to the actual production condition. The water supply flow uses an electric valve, an electromagnetic flow meter, a radar liquid level meter, a far infrared temperature measuring instrument and the like, and automatic control is realized through a central control system.
Specifically, the water supply flow curve is:
(i) the water supply flow is gradually increased from 0 to 5t/h 10 minutes before water supply;
(ii) keeping the flow rate for continuously supplying water for 50-80 minutes after the flow rate reaches 5 t/h;
(ii) after the uniform water supply is finished, the water supply flow is increased to 10-15t/h until the steel slag is submerged by the water level in the tank by about 100 mm.
(c) Keeping the water level below 100 ℃ and starting to drain.
The water supply and drainage process in the step (b) and the step (c) is a slag smoldering process, and the whole process is 3-4 hours and can be correspondingly adjusted according to the amount of slag. Generally, when the water temperature is lower than 100 ℃, the hydration reaction is obviously slowed down, and slag smoldering is finished.
In the slag smoldering process, firstly, steam rises in the tank through a steel slag gap, and certain pressure is formed in the steel slag to steam the steel slag. Along with the rise of the water level, the steel slag is immersed into water with the temperature of more than 100 ℃ to be boiled in high-temperature water. The steaming and the water boiling are both beneficial to the occurrence of hydration reaction, and the steel slag is uniformly hydrated in the whole hot smoldering process in two ways, so that the qualified slag smoldering effect is achieved.
(d) The waste heat recovery system is composed of a water-cooling dust collecting hood, a water-cooling flue, a waste heat boiler and the like, and is used for recovering waste heat of hot flue gas generated by combustible gas combustion to produce clean saturated steam for being dragged by the steam power of the dust removal fan.
In the process of hot slag smoldering, the water vapor replaces the air in the slag tank, so that oxygen molecules in the slag tank are reduced, conditions are created for the generation of CO, and CO and H are generated simultaneously2The reaction is as follows:
C+H2high temperature of O-CO + H2 (main reaction)
C+2H2High temperature of O-CO2+2H2(major minor reaction)Application)
The mixture of hydrogen and carbon monoxide, namely 'water gas', belongs to flammable and explosive gas and is the main reason of explosion in the pit sealing or pressure hot sealing process. Because the solid tank of the new process is not covered and unsealed, combustible gas which gradually rises in the tank is fully combusted on the surface of hot steel slag, not only can explosion be effectively prevented, but also a large amount of chemical reaction heat is generated.
According to data collected by factory production experiments, the temperature of mixed flue gas entering the dust hood is as high as over 800 ℃. Because the flue gas temperature is higher and the steam quantity is large, the spraying of refractory materials is not suitable, and the water-cooling dust hood and the water-cooling flue can effectively protect the dust hood and the flue. In order to avoid excessive heat loss, the cooling water flow in the dust collecting cover and the flue is required to be as small as possible on the basis of protecting the dust collecting cover and the flue. Through measurement and calculation, the temperature of the mixed flue gas is reduced to 200 ℃ after passing through the water-cooling dust collecting hood and the waste heat boiler, pure saturated steam of more than 2t/h can be generated, the discharged steam pressure is 0.8MPa, and the coaxial steam turbine drags the dust removal fan, so that the power consumption of the slag smoldering system can be greatly reduced. In the actual production, at least 4 slag tanks are simultaneously smoldered, and the generated pure saturated steam can completely replace a dust removal fan motor to do work.
Normal pressure steam generated in the slag smoldering process is dedusted along with flue gas through the dust collection hood and the flue, and water cooled by the steam is used as water supplement for water bath dedusting.
Claims (6)
1. A reverse water immersion normal pressure hot disintegrating steel slag and waste heat recovery system is characterized by comprising a slag disintegrating device and a waste heat recovery device connected with the slag disintegrating device; the slag disintegrating device comprises a solid slag tank, a water supply and drainage device communicated with the bottom of the solid slag tank and a water-cooling dust cage (1) arranged above the solid slag tank; waste heat recovery device include with waste heat boiler (3) that water-cooling dust cage (1) is connected through water-cooling flue (2), spray tower (5), dehydrator (6), wet-type electron gas wash tower (7), dust exhausting fan (8) and net gas emission tower (9) that connect gradually are communicate in low temperature flue gas pipeline (4) of waste heat boiler (3), dust exhausting fan (8) drag through steam turbine (10), steam turbine (10) are connected in saturated steam pipeline (11) of waste heat boiler (3).
2. The system for recovering the normal-pressure hot stuffy steel slag and the waste heat by the reverse water immersion method according to claim 1, wherein the solid slag tank comprises a tank body (12) with an open top, a water supply and drainage port (13) arranged at the bottom of the tank body (12), and a spherical overflow cover (14) arranged at the upper part of the water supply and drainage port (13) and fixedly connected with the bottom surface of the tank body (12), wherein the spherical overflow cover (14) is provided with long holes (15), the long holes (15) are arranged in a circular array, and the top of the spherical overflow cover (14) is provided with a screen (16).
3. The system for recovering the normal-pressure hot-stuffy steel slag and the waste heat by the reverse water immersion method according to claim 2, wherein the water supply and drainage device comprises a water supply and drainage pipeline (17) connected with the water supply and drainage port (13), the end of the water supply and drainage pipeline (17) is provided with a quick joint (18) and is connected with a water supply pipe (20) through a hose (19), and the water supply pipe (20) is communicated with a drainage branch pipe (21).
4. The system for recovering the normal-pressure hot stuffy steel slag and the waste heat by the reverse water immersion method according to claim 3, wherein a pipeline pump (22) and a drainage electric butterfly valve (23) are arranged on the drainage branch pipe (21) and communicated with a drainage tank (24), an electric regulating valve (25), a ball valve (26), an electromagnetic flowmeter (27), a water supply electric butterfly valve (28), a check valve (29) and a horizontal water pump (30) are sequentially arranged on the water supply pipe (20), and the horizontal water pump (30) is communicated with a water supply tank (31).
5. The reverse-immersion normal-pressure hot-smoldering steel slag and waste heat recovery system according to claim 3, characterized in that the tank body (12) is provided with a radar liquid level meter (32) and a far infrared temperature measuring instrument (33).
6. The system for recovering normal-pressure hot steel slag smoldering and waste heat by a reverse water immersion method according to claim 1, characterized in that more than 4 slag smoldering devices are connected with a waste heat recovery device together.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113736931A (en) * | 2021-08-06 | 2021-12-03 | 中钢(石家庄)工程技术有限公司 | Reverse water immersion method normal pressure hot disintegrating steel slag and waste heat recovery system and method |
| CN114774597A (en) * | 2022-04-15 | 2022-07-22 | 中钢石家庄工程设计研究院有限公司 | Method for treating various steel slags by tipping hot smoldering process |
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2021
- 2021-08-06 CN CN202121830455.8U patent/CN215628047U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113736931A (en) * | 2021-08-06 | 2021-12-03 | 中钢(石家庄)工程技术有限公司 | Reverse water immersion method normal pressure hot disintegrating steel slag and waste heat recovery system and method |
| CN114774597A (en) * | 2022-04-15 | 2022-07-22 | 中钢石家庄工程设计研究院有限公司 | Method for treating various steel slags by tipping hot smoldering process |
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Address after: 050021 No. 108 Huai'an East Road, Yuhua District, Shijiazhuang City, Hebei Province Patentee after: Hebei Antai Engineering Technology Co.,Ltd. Address before: 050021 No. 108 Huai'an East Road, Yuhua District, Shijiazhuang City, Hebei Province Patentee before: Sinosteel (Shijiazhuang) Engineering Technology Co.,Ltd. |