CN221347042U - Dust-containing waste heat steam recycling device for steel slag heat braising - Google Patents
Dust-containing waste heat steam recycling device for steel slag heat braising Download PDFInfo
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- 239000002918 waste heat Substances 0.000 title claims abstract description 144
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 239000002893 slag Substances 0.000 title claims abstract description 84
- 239000000428 dust Substances 0.000 title claims abstract description 43
- 238000004064 recycling Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 577
- 238000010438 heat treatment Methods 0.000 claims abstract description 85
- 238000004146 energy storage Methods 0.000 claims abstract description 54
- 230000001502 supplementing effect Effects 0.000 claims abstract description 48
- 238000010248 power generation Methods 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 239000010865 sewage Substances 0.000 claims description 14
- 238000009833 condensation Methods 0.000 claims description 10
- 230000005494 condensation Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 37
- 230000008569 process Effects 0.000 abstract description 30
- 230000008901 benefit Effects 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 description 39
- 239000000126 substance Substances 0.000 description 9
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 238000005338 heat storage Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000000746 purification Methods 0.000 description 5
- 238000003912 environmental pollution Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
A dust-containing waste heat steam recycling device for steel slag heat braising belongs to the technical field of waste heat recycling. The utility model solves the problem of disordered discharge of dust-containing waste heat steam generated in the pressure heat stewing process of steel slag. The device comprises a steam recovery heating and heat supplementing unit, a heating energy storage water tank, a primary water side circulation unit, a vacuum phase conversion heat device, a secondary water side circulation unit, a low-temperature waste heat organic Rankine cycle power generation device and the like; the heating energy storage water tank is respectively connected with the steam recovery heating and heat supplementing unit and the primary water side circulating unit; the vacuum phase heat exchange device is respectively connected with the primary water side circulation unit and the secondary water side circulation unit; the low-temperature waste heat organic Rankine cycle power generation device is connected with the secondary water side circulation unit. The advantages are that: the continuous and stable recycling of the rest hot steam is realized, the energy is saved, the running cost of enterprises is reduced, and the energy-saving and environment-friendly benefits and economic benefits are better.
Description
Technical Field
The utility model belongs to the technical field of waste heat recovery and utilization, and particularly relates to a dust-containing waste heat steam recovery and utilization device for steel slag heat braising.
Background
The steel slag rolling crushing-hot pressing technology is an advanced technology suitable for steel slag treatment at various temperatures, and is widely applied to large and medium-sized steel enterprises in China; the steel slag hot stewing process is that after the steel slag is rolled and crushed, the steel slag at about 700 ℃ enters a pressure hot stewing tank, is continuously cooled by water, and completes the processes of pulverization, slag and steel separation and the like of the steel slag, wherein the steel slag pressure hot stewing process can be divided into 3 stages: the method comprises a boosting stage, a pressure stabilizing stage and a cooling stage, wherein discontinuous dust-containing waste heat saturated steam with the pressure of 0.2MPa can be generated in a steel slag pot-type pressure heat stewing link; because the production operation of the steel slag pressure heat stewing system is discontinuous, the generated dust-containing waste heat saturated steam is also a discontinuous process, and the dust-containing waste heat saturated steam generated in the steel slag pressure heat stewing process contains a large amount of dust particles and a certain amount of acid/alkaline substances, so that the recovery of the waste heat of the steam is very difficult, and the dust-containing waste heat saturated steam generated in the current domestic steel slag pressure heat stewing process is mostly in a diffusing state, so that the surrounding environment is greatly polluted, and the energy is greatly wasted.
In summary, the main problems of the dust-containing waste heat steam recycling technology generated by the pressure heat stewing of the steel slag are as follows:
1. The dust-containing waste heat steam generated in the pressure heat stewing process of the steel slag carries a large amount of dust particles and a certain content of acid/alkaline substances, so that serious scaling phenomena are easily caused to pipelines and equipment, the stable operation of a steam recovery system is influenced, the dust-containing waste heat steam generated in the pressure heat stewing process of the steel slag is mostly in a diffusing state, the surrounding environment is greatly polluted, and the energy is greatly wasted.
2. The production operation of the steel slag pressurized heat stewing system is discontinuous, the generated dust-containing waste heat steam is also a discontinuous process, and the continuous operation difficulty of the steam waste heat recovery system is high.
Disclosure of utility model
The utility model aims to provide a dust-containing waste heat steam recycling device for steel slag heat stewing, which solves the problem of disordered emission of dust-containing waste heat steam generated in the steel slag pressure heat stewing process, realizes continuous and stable recycling of the rest of heat steam, reduces energy waste and environmental pollution, and has better economic benefit and environmental protection benefit.
The technical scheme of the utility model is as follows:
1. Introducing dust-containing waste heat steam generated in the steel slag pressure heat stewing process into a heating energy storage water tank to directly heat water for heat exchange, and simultaneously, utilizing the washing and dissolving actions of water on dust particles and a certain content of acid/alkaline substances carried in the waste heat steam to wet-purify harmful substances in the waste heat steam; in this way, the waste heat steam carrying a large amount of dust particles and a certain content of acid/alkaline substances is converted into primary waste heat water with a certain temperature; solves the problem that dust-containing waste heat steam generated in the pressure heat stewing process of the steel slag can not be recycled, and reduces energy waste and environmental pollution.
2. The system assemblies such as the dust-containing waste heat steam direct heating energy storage water tank, the waste heat primary water circulation unit, the secondary water circulation unit, the low-temperature waste heat power generation device and the like are adopted, primary waste heat water containing a large amount of pollutants is converted into secondary waste heat water with good water quality by the vacuum phase conversion device, and then the secondary waste heat water is used for low-temperature heat energy of the low-temperature waste heat organic Rankine cycle power generation device, so that the heat recovery of the steel slag under-pressure stewing waste heat steam and the heat conversion between the waste heat primary water side, the secondary water side and the low-temperature waste heat power generation system are realized, the problem of discontinuous steam supply of the waste heat steam generated in the steel slag under-pressure stewing process is solved, the long-term continuous stable operation requirement of dust-containing waste heat steam recovery and utilization can be realized, the energy is further saved, and the enterprise operation cost is reduced.
A dust-containing waste heat steam recycling device for steel slag braising comprises: the device comprises a first steam valve 1, a steel slag heat stewing steam pipe 2, a water tank direct heating steam pipe 3, a supplementary steam pipe 4, a second steam valve 5, a heating energy storage water tank 6, a primary water supply pump 7, a primary water supply pipe 8, a vacuum phase conversion device 9, a primary water first return pipe 10, a primary water return pump 11, a primary water second return pipe 12, a secondary water supply pipe 13, a low-temperature waste heat organic Rankine cycle power generation device 14, a secondary water first return pipe 15, a secondary water circulation pump 16, a secondary water second return pipe 17, a condensation pipe 18, a water supplementing device 19, a water supplementing pipe 20, an electric blow-down valve 21, a blow-down pipe 22 and a drainage ditch 23;
The device comprises a dust-containing waste heat steam recovery heating and heat supplementing unit, wherein the dust-containing waste heat steam recovery heating and heat supplementing unit is composed of a first steam valve 1, a steel slag heat stewing steam pipe 2, a water tank direct heating steam pipe 3, a supplementing steam pipe 4, a second steam valve 5 and a heating energy storage water tank 6, dust-containing waste heat steam generated in the steel slag pressure heat stewing process is introduced into the heating energy storage water tank to directly heat water for heat exchange, primary waste heat water is replaced, meanwhile, dust particles carried in the waste heat steam and acid/alkaline substances with a certain content are washed and dissolved by the water, the harmful substances in the dust-containing waste heat steam are subjected to wet purification, and when the heat is insufficient due to unstable steel slag heat stewing waste heat steam, the supplementing heat can be provided for the device through the steam supplementing pipe, so that the stable operation of the device is met. The heating energy storage water tank 6, the primary water supply pump 7, the primary water supply pipe 8, the vacuum phase heat exchange device 9, the primary water first return pipe 10, the primary water return pump 11 and the primary water second return pipe 12 form a primary water side circulation unit of the device, and the primary water absorbs residual heat steam heat in the heating energy storage water tank 6 to provide a primary water heat source for the vacuum phase heat exchange device 9. The vacuum phase conversion heat device 9, the secondary water supply pipe 13, the low-temperature waste heat organic Rankine cycle power generation device 14, the secondary water first return pipe 15, the secondary water circulation pump 16 and the secondary water second return pipe 17 form a secondary water side circulation unit of the device, and the vacuum phase conversion heat device 9 is utilized to convert primary waste heat water containing more pollutants into cleaner secondary waste heat water and provide required heat for the low-temperature waste heat organic Rankine cycle power generation device 14. The water supplementing device 19 and the water supplementing pipe 20 form a water supplementing device of the secondary water side circulating unit, and the water supplementing and constant pressure requirements of the secondary water side circulating unit are met. The electric blow-down valve 21, the blow-down pipe 22 and the drain ditch 23 form a blow-down device for heating the energy storage water tank 6, and the sewage is regularly discharged according to the actual running condition of the site.
The inlet end of the first steam valve 1 is connected with the waste heat steam outlet of the steel slag braising device 100, the outlet end of the first steam valve 1 is connected with the inlet end of the steel slag braising steam pipe 2, the outlet end of the steel slag braising steam pipe 2 is connected with the inlet end of the direct heating steam pipe 3, the direct heating steam pipe 3 is arranged above a primary water inlet of the heating energy storage water tank 6, the outlet end of the supplementing steam pipe 4 is connected on the pipe section of the steel slag braising steam pipe 2, the inlet end of the supplementing steam pipe 4 is connected with the outlet end of the second steam valve 5, the inlet end of the second steam valve 5 is connected with a steel mill regional steam pipe network, a primary water outlet of the heating energy storage water tank 6 is connected with a water inlet of the primary water supply pump 7, a water outlet of the primary water supply pump 7 is connected with a water inlet end of the primary water supply pipe 8, a water outlet end of the primary water supply pipe 8 is connected with a primary water inlet of the vacuum phase heat exchange device 9, the primary water outlet of the vacuum phase conversion heat device 9 is connected with the water inlet end of a primary water first return pipe 10, the water outlet end of the primary water first return pipe 10 is connected with the water inlet end of a primary water return pump 11, the water outlet end of the primary water return pump 11 is connected with the water inlet end of a primary water second return pipe 12, the water outlet end of the primary water second return pipe 12 is connected with the primary water inlet end of a heating energy storage water tank 6, the secondary water outlet of the vacuum phase conversion heat device 9 is connected with the water inlet end of a secondary water supply pipe 13, the water outlet end of the secondary water supply pipe 13 is connected with the water inlet end of a low-temperature waste heat organic Rankine cycle power generation device 14, the water outlet end of the low-temperature waste heat organic Rankine cycle power generation device 14 is connected with the water inlet end of a secondary water first return pipe 15, the water outlet end of the secondary water first return pipe 15 is connected with the water inlet of a secondary water circulation pump 16, the water outlet of the secondary water circulating pump 16 is connected with the water inlet end of a secondary water second return pipe 17, the water outlet end of the secondary water second return pipe 17 is connected with the secondary water inlet of the vacuum phase conversion device 9, the condensed water outlet of the vacuum phase conversion device 9 is connected with the water inlet end of a condensed water pipe 18, the water outlet end of the condensed water pipe 18 is connected with the condensed water inlet of the heating energy storage water tank 6, the water outlet of the water supplementing device 19 is connected with the water inlet end of a water supplementing pipe 20, the water outlet end of the water supplementing pipe 20 is connected on the section of a secondary water first return pipe 15, the inlet of the electric blow-down valve 21 is connected with the sewage outlet of the heating energy storage water tank 6, the outlet of the electric blow-down valve 21 is connected with the water inlet end of the sewage pipe 22, and the water outlet end of the sewage pipe 22 is led into the drainage ditch 23.
Further, according to the specific operation condition of the steel slag heat stewing process, when the device provides insufficient heat due to unstable steam quantity of the waste heat of the steel slag heat stewing process and the like, the second steam valve 5 is opened, the first steam valve 1 is closed, and the steam of a steam pipe network in a steel plant area can be used for providing a supplementary steam heat source for the device through the second steam valve 5 and the supplementary steam pipe 4, so that the device can continuously and stably operate, and the best operation parameters and operation effects of waste heat utilization are achieved.
The application method of the device comprises the following specific steps and parameters:
1. Firstly, after the primary water side circulation unit and the secondary water side circulation unit are filled with water, the vacuum phase heat exchange device 9 is kept at a necessary vacuum degree, then the primary water supply pump 7, the primary water return pump 11 and the secondary water circulation pump 16 are started in sequence, the primary water side circulation unit and the secondary water side circulation unit are kept to continuously operate, and when the secondary water supply temperature is more than or equal to 80 ℃, the low-temperature waste heat organic Rankine cycle power generation device 14 is started to operate.
2. The device is operated in a heating working condition operation stage when steam is directly heated and a heat storage working condition operation stage when no steam is directly heated, after the device is normally operated, the temperature of primary water supply is increased from 85 ℃ to 95 ℃, the temperature of primary water return is controlled to be about 55 ℃, the temperature of secondary water supply is controlled to be increased from 80 ℃ to 90 ℃, and the temperature of secondary water return is controlled to be about 50 ℃ in each heating working condition operation time; in the operation time of each heat storage working condition, the water supply temperature of the primary water is reduced from 95 ℃ to 85 ℃, the water return temperature of the primary water is controlled to be about 55 ℃, the water supply temperature of the secondary water is controlled to be reduced from 90 ℃ to 80 ℃, and the water return temperature of the secondary water is controlled to be about 50 ℃; When the device is in normal operation, the first steam valve 1 is opened, the second steam valve 5 is closed, after the operation of the steel slag stewing process is normal, the generated waste heat steam sequentially passes through the first steam valve 1, the steel slag stewing steam pipe 2 and the water tank direct heating steam pipe 3 to directly heat primary water in the tank body of the heating energy storage water tank 6, the primary water gradually rises after absorbing the heat of the direct heating of the waste heat steam in the tank body of the heating energy storage water tank 6, the primary water sequentially enters the vacuum phase change heat exchange device 9 through the primary water supply pump 7 and the primary water supply pipe 8 for vacuum phase change heat exchange, the primary water after heat exchange and temperature reduction sequentially passes through the primary water first water return pipe 10, the primary water return pump 11 and the primary water second water return pipe 12 for circulation heat exchange in the tank body of the heating energy storage water tank 6, the condensed water after phase change heat exchange also flows back to the tank body of the heating energy storage water tank 6 through the condensed water pipe 18 for circulating heat exchange; The secondary water after heat absorption of the vacuum phase conversion device 9 enters the low-temperature waste heat organic Rankine cycle power generation device 14 through the secondary water supply pipe 13, exchanges heat with the internal power generation cycle working medium of the low-temperature waste heat organic Rankine cycle power generation device 14, and flows back to the vacuum phase conversion device 9 for cycle heat exchange through the first water return pipe 15, the secondary water circulation pump 16 and the secondary water second water return pipe 17 after heat exchange and cooling, and the generated energy of the low-temperature waste heat organic Rankine cycle power generation device 14 is integrated into a regional power grid of a steel plant for use; the heat released by directly heating the primary water by the waste heat steam in the heating energy storage water tank 6 is partially used for meeting the heat absorbed by the secondary water in the vacuum phase conversion heat device 9, and the other part is used for carrying out heat storage and temperature rise on the primary water; Thus, the device is capable of operating for the whole operating time, The total heat Sigma Q 2 absorbed by the secondary water in the vacuum phase conversion heat device 9 (namely, the total heat provided by the secondary water is the low-temperature waste heat organic Rankine cycle power generation device 14) is equal to the total heat Sigma Q 1 emitted by the primary water in the vacuum phase conversion heat device 6 and the total heat Sigma Q 0 emitted by the waste heat steam directly heated in the tank body of the heating energy storage water tank 6, Sigma Q 2＝∑Q1＝∑Q0, according to the calculation of heat balance theory, determines that the main operation parameter of the device is ：∑Q0＝L Waste heat steam *1000*γ Waste heat steam *T kJ,∑Q1＝C Water and its preparation method *1000*L water vapor 1(t1gp-t1n)*T+L water vapor 1*1000*γ water vapor 1*T kJ, primary steam evaporation amount in the vacuum phase conversion device 9: l water vapor 1＝∑Q1/(C Water and its preparation method *ρ Water and its preparation method *(t1gp-t1n)*T+1000*γ water vapor 1 x T) T/h, primary water side water supply flow: l Water and its preparation method 1g＝∑Q 1/(C Water and its preparation method *ρ Water and its preparation method (t1gp-t1h)*T)m3 and/h, Primary water side backwater flow ：L Water and its preparation method 1h＝L Water and its preparation method 1g-L condensed water 1,∑Q 2＝C Water and its preparation method *ρ Water and its preparation method *L Water and its preparation method 2(t2gp-t2h)*T m3/h, secondary water side circulating water flow: l Water and its preparation method 2＝∑Q 2/(C Water and its preparation method *ρ Water and its preparation method (t2gp-t2h)*T)m3/h, wherein C Water and its preparation method is the specific heat capacity kJ/kg.K of water, ρ Water and its preparation method is the volume weight kg/m3 of water, L Water and its preparation method 2 is the secondary water side circulating water flow m 3/h,L Water and its preparation method 1g is the primary water side water supply flow m 3/h,L Water and its preparation method 1h is the primary water side backwater flow m 3/h,L Waste heat steam is the waste heat steam flow t/h, l water vapor 1 is the evaporation capacity of primary water vapor t/h, t 1gp is the average temperature of primary water supply, t 1n is the temperature of primary water vapor condensation water, t 1h is the temperature of primary water return water, Gamma Waste heat steam is the latent heat of vaporization kJ/kg of waste heat steam, gamma water vapor 1 is the latent heat of vaporization kJ/kg of primary steam, t 2gp is the average temperature of secondary water supply, t 2h is the temperature of secondary water return, And T is the annual operation time h of the device, and the evaporation condensation water quantity of the primary water in the vacuum phase heat exchange device 6 is equal to that of the primary water, namely L condensed water 1＝L Water and its preparation method steam 1.
3. When the dust-containing waste heat steam directly heats water in the heating energy storage water tank 6, the primary water side circulation unit carries out wet purification on pollutants in the waste heat steam, so that the pollutants in the primary water side circulation unit can be gradually deposited at the bottom of the tank body of the heating energy storage water tank 6, the electric blow-down valve 21 can be periodically opened according to actual running conditions, and sewage is discharged into the drainage ditch 23 through the blow-down pipe 22.
4. After the device is operated according to the steps of the method, the annual energy generation of the waste heat steam recovery of the steel slag heat braising process is as follows: Σn= Σq 2 a/1000kWh, calculated as ton slag recovery power: n= Σn/P, where Σq 2 is total heat kJ provided by the secondary water for the low temperature waste heat organic rankine cycle power generation device 14, a is a low temperature waste heat power generation coefficient, generally a=0.057-0.061 kWh/MJ, and P is annual output t/a of the steel slag braising production line.
The utility model has the advantages that: 1. waste heat steam generated in the steel slag pressure heat stewing process is introduced into the heating energy storage water tank to directly heat water for heat exchange, so that the heat exchange efficiency is high, the purification effect is good, the problem that dust-containing waste heat steam generated in the steel slag pressure heat stewing process cannot be recycled is solved, and the energy waste and the environmental pollution are reduced; 2. the waste heat steam is used for directly heating the energy storage water tank, the waste heat primary water circulation unit, the secondary water circulation unit, the low-temperature waste heat power generation device and other unit assemblies, the vacuum phase conversion device is used for converting primary waste heat water containing a large amount of pollutants into secondary waste heat water with good water quality, and the secondary waste heat water is used for a low-temperature heat source of the low-temperature waste heat organic Rankine cycle power generation device, so that the heat recovery of the steel slag under pressure heat stewing waste heat steam and the heat conversion between the waste heat primary water side, the secondary water side and the low-temperature waste heat power generation unit are realized, the problem of discontinuous steam supply of the waste heat steam generated in the steel slag under pressure heat stewing process is solved, the long-term continuous stable operation requirement of dust-containing waste heat steam recovery and utilization can be realized, the energy is saved, and the enterprise operation cost is reduced.
Drawings
Fig. 1 is a schematic system flow diagram of the present apparatus. The device comprises a first steam valve 1, a steel slag heat stewing steam pipe 2, a water tank direct heating steam pipe 3, a supplementing steam pipe 4, a second steam valve 5, a heating energy storage water tank 6, a primary water supply pump 7, a primary water supply pipe 8, a vacuum phase conversion heat device 9, a primary water first return pipe 10, a primary water return pump 11, a primary water second return pipe 12, a secondary water supply pipe 13, a low-temperature waste heat organic Rankine cycle power generation device 14, a secondary water first return pipe 15, a secondary water circulation pump 16, a secondary water second return pipe 17, a condensation pipe 18, a water supplementing device 19, a water supplementing pipe 20, an electric blow-down valve 21, a blow-down pipe 22 and a drainage ditch 23, wherein the first steam valve is provided with a first water inlet pipe 8, a steel slag heat stewing steam pipe 2, a water tank direct heating steam pipe 3, a supplementing steam pipe 4, a second steam valve 5, a heating energy storage water tank 6, a primary water supply pipe 20, a vacuum phase conversion heat pipe 9, a primary water first return pipe 10, a blow-down pipe 22 and a drainage ditch 23;
The steel slag heat stewing device 100.
Detailed Description
A dust-containing waste heat steam recycling device for steel slag braising comprises: the device comprises a first steam valve 1, a steel slag heat stewing steam pipe 2, a water tank direct heating steam pipe 3, a supplementary steam pipe 4, a second steam valve 5, a heating energy storage water tank 6, a primary water supply pump 7, a primary water supply pipe 8, a vacuum phase conversion device 9, a primary water first return pipe 10, a primary water return pump 11, a primary water second return pipe 12, a secondary water supply pipe 13, a low-temperature waste heat organic Rankine cycle power generation device 14, a secondary water first return pipe 15, a secondary water circulation pump 16, a secondary water second return pipe 17, a condensation pipe 18, a water supplementing device 19, a water supplementing pipe 20, an electric blow-down valve 21, a blow-down pipe 22 and a drainage ditch 23;
The device comprises a dust-containing waste heat steam recovery heating and heat supplementing unit, wherein the dust-containing waste heat steam recovery heating and heat supplementing unit is composed of a first steam valve 1, a steel slag heat stewing steam pipe 2, a water tank direct heating steam pipe 3, a supplementing steam pipe 4, a second steam valve 5 and a heating energy storage water tank 6, waste heat steam generated in the steel slag pressure heat stewing process is introduced into the heating energy storage water tank to directly heat water for heat exchange, the waste heat water is replaced once, meanwhile, dust particles carried in the waste heat steam and acid/alkaline substances with a certain content are washed and dissolved by the water, harmful substances in the waste heat steam are subjected to wet purification, and when the heat quantity of the steel slag heat stewing waste heat steam is unstable to cause the device to provide insufficient heat, the supplementing heat can be provided for the device through the steam supplementing pipe, so that the stable operation of the device is met. The heating energy storage water tank 6, the primary water supply pump 7, the primary water supply pipe 8, the vacuum phase heat exchange device 9, the primary water first return pipe 10, the primary water return pump 11 and the primary water second return pipe 12 form a primary water side circulation unit of the device, and the primary water absorbs residual heat steam heat in the heating energy storage water tank 6 to provide a primary water heat source for the vacuum phase heat exchange device 9. The vacuum phase conversion heat device 9, the secondary water supply pipe 13, the low-temperature waste heat organic Rankine cycle power generation device 14, the secondary water first return pipe 15, the secondary water circulation pump 16 and the secondary water second return pipe 17 form a secondary water side circulation unit of the device, and the vacuum phase conversion heat device 9 is utilized to convert primary waste heat water containing more pollutants into cleaner secondary waste heat water and provide required heat for the low-temperature waste heat organic Rankine cycle power generation device 14. The water supplementing device 19 and the water supplementing pipe 20 form a water supplementing device of the secondary water side circulating unit, and the water supplementing and constant pressure requirements of the secondary water side circulating unit are met. The electric blow-down valve 21, the blow-down pipe 22 and the drain ditch 23 form a blow-down device for heating the energy storage water tank 6, and the sewage is regularly discharged according to the actual running condition of the site.
The inlet end of the first steam valve 1 is connected with the waste heat steam outlet of the steel slag braising device 100, the outlet end of the first steam valve 1 is connected with the inlet end of the steel slag braising steam pipe 2, the outlet end of the steel slag braising steam pipe 2 is connected with the inlet end of the direct heating steam pipe 3, the direct heating steam pipe 3 is arranged above a primary water inlet of the heating energy storage water tank 6, the outlet end of the supplementing steam pipe 4 is connected on the pipe section of the steel slag braising steam pipe 2, the inlet end of the supplementing steam pipe 4 is connected with the outlet end of the second steam valve 5, the inlet end of the second steam valve 5 is connected with a steel mill regional steam pipe network, a primary water outlet of the heating energy storage water tank 6 is connected with a water inlet of the primary water supply pump 7, a water outlet of the primary water supply pump 7 is connected with a water inlet end of the primary water supply pipe 8, a water outlet end of the primary water supply pipe 8 is connected with a primary water inlet of the vacuum phase heat exchange device 9, the primary water outlet of the vacuum phase conversion heat device 9 is connected with the water inlet end of a primary water first return pipe 10, the water outlet end of the primary water first return pipe 10 is connected with the water inlet end of a primary water return pump 11, the water outlet end of the primary water return pump 11 is connected with the water inlet end of a primary water second return pipe 12, the water outlet end of the primary water second return pipe 12 is connected with the primary water inlet end of a heating energy storage water tank 6, the secondary water outlet of the vacuum phase conversion heat device 9 is connected with the water inlet end of a secondary water supply pipe 13, the water outlet end of the secondary water supply pipe 13 is connected with the water inlet end of a low-temperature waste heat organic Rankine cycle power generation device 14, the water outlet end of the low-temperature waste heat organic Rankine cycle power generation device 14 is connected with the water inlet end of a secondary water first return pipe 15, the water outlet end of the secondary water first return pipe 15 is connected with the water inlet of a secondary water circulation pump 16, the water outlet of the secondary water circulating pump 16 is connected with the water inlet end of a secondary water second return pipe 17, the water outlet end of the secondary water second return pipe 17 is connected with the secondary water inlet of the vacuum phase conversion device 9, the condensed water outlet of the vacuum phase conversion device 9 is connected with the water inlet end of a condensed water pipe 18, the water outlet end of the condensed water pipe 18 is connected with the condensed water inlet of the heating energy storage water tank 6, the water outlet of the water supplementing device 19 is connected with the water inlet end of a water supplementing pipe 20, the water outlet end of the water supplementing pipe 20 is connected on the section of a secondary water first return pipe 15, the inlet of the electric blow-down valve 21 is connected with the sewage outlet of the heating energy storage water tank 6, the outlet of the electric blow-down valve 21 is connected with the water inlet end of the sewage pipe 22, and the water outlet end of the sewage pipe 22 is led into the drainage ditch 23.
Further, according to the specific operation condition of the steel slag heat stewing process, when the device provides insufficient heat due to unstable steam quantity of the waste heat of the steel slag heat stewing process and the like, the second steam valve 5 is opened, the first steam valve 1 is closed, and the steam of a steam pipe network in a steel plant area can be used for providing a supplementary steam heat source for the device through the second steam valve 5 and the supplementary steam pipe 4, so that the device can continuously and stably operate, and the best operation parameters and operation effects of waste heat utilization are achieved.
The method for using the above-mentioned waste heat steam recycling device for braising steel slag is shown in example 1.
Example 1
Taking a steel slag heat stewing production line of a certain steel plant as an example: the steel slag has about the production capacity of heat stewing for a year: 62 ten thousand t/a, the annual working time is about 7920 hours, after the steel slag is rolled and crushed, the steel slag at about 700 ℃ enters a pressure heat stewing tank, the average waste heat steam quantity generated in the heat stewing process of the steel slag is about 4t/h, and the waste heat steam pressure is about: 0.2MPa.
The application method of the dust-containing waste heat steam recycling device for the steel slag heat braising comprises the following specific steps and parameters:
1. Firstly, after the primary water side circulation unit and the secondary water side circulation unit are filled with water, the vacuum phase heat exchange device 9 is kept at a necessary vacuum degree, then the primary water supply pump 7, the primary water return pump 11 and the secondary water circulation pump 16 are started in sequence, the primary water side circulation unit and the secondary water side circulation unit are kept to continuously operate, and when the secondary water supply temperature is more than or equal to 80 ℃, the low-temperature waste heat organic Rankine cycle power generation device 14 is started to operate.
2. The device is operated in a heating working condition operation stage when steam is directly heated and a heat storage working condition operation stage when no steam is directly heated, after the device is normally operated, the temperature of primary water supply is increased from 85 ℃ to 95 ℃, the temperature of primary water return is controlled to be about 55 ℃, the temperature of secondary water supply is controlled to be increased from 80 ℃ to 90 ℃, and the temperature of secondary water return is controlled to be about 50 ℃ in each heating working condition operation time; in the operation time of each heat storage working condition, the water supply temperature of the primary water is reduced from 95 ℃ to 85 ℃, the water return temperature of the primary water is controlled to be about 55 ℃, the water supply temperature of the secondary water is controlled to be reduced from 90 ℃ to 80 ℃, and the water return temperature of the secondary water is controlled to be about 50 ℃; When the device is in normal operation, the first steam valve 1 is opened, the second steam valve 5 is closed, after the operation of the steel slag stewing process is normal, the generated waste heat steam sequentially passes through the first steam valve 1, the steel slag stewing steam pipe 2 and the water tank direct heating steam pipe 3 to directly heat primary water in the tank body of the heating energy storage water tank 6, the primary water gradually rises after absorbing the heat of the direct heating of the waste heat steam in the tank body of the heating energy storage water tank 6, the primary water sequentially enters the vacuum phase change heat exchange device 9 through the primary water supply pump 7 and the primary water supply pipe 8 for vacuum phase change heat exchange, the primary water after heat exchange and temperature reduction sequentially passes through the primary water first water return pipe 10, the primary water return pump 11 and the primary water second water return pipe 12 for circulation heat exchange in the tank body of the heating energy storage water tank 6, the condensed water after phase change heat exchange also flows back to the tank body of the heating energy storage water tank 6 through the condensed water pipe 18 for circulating heat exchange; The secondary water after heat absorption of the vacuum phase conversion device 9 enters the low-temperature waste heat organic Rankine cycle power generation device 14 through the secondary water supply pipe 13, exchanges heat with the internal power generation cycle working medium of the low-temperature waste heat organic Rankine cycle power generation device 14, and flows back to the vacuum phase conversion device 9 for cycle heat exchange through the first water return pipe 15, the secondary water circulation pump 16 and the secondary water second water return pipe 17 after heat exchange and cooling, and the generated energy of the low-temperature waste heat organic Rankine cycle power generation device 14 is integrated into a regional power grid of a steel plant for use; the heat released by directly heating the primary water by the waste heat steam in the heating energy storage water tank 6 is partially used for meeting the heat absorbed by the secondary water in the vacuum phase conversion heat device 9, and the other part is used for carrying out heat storage and temperature rise on the primary water; Thus, the device is operated for the whole operating time T (h), The total heat Sigma Q 2 absorbed by the secondary water in the vacuum phase conversion heat device 9 (namely, the total heat provided by the secondary water is the low-temperature waste heat organic Rankine cycle power generation device 14) is equal to the total heat Sigma Q 1 emitted by the primary water in the vacuum phase conversion heat device 6 and the total heat Sigma Q 0 emitted by the waste heat steam directly heated in the tank body of the heating energy storage water tank 6, Sigma Q 2＝∑Q1＝∑Q0, calculated according to the theory of thermal equilibrium, The main operation parameter of the device is ：∑Q0＝L Waste heat steam *1000*γ Waste heat steam *T kJ＝4*1000*2200*7920＝6.97x1010kJ,∑Q1＝C Water and its preparation method *1000*L water vapor 1(t1gp-t1n)*T+L water vapor 1*1000*γ water vapor 1*T(kJ)＝6.97x1010kJ,, the primary water vapor evaporation capacity ：L water vapor 1＝∑Q1/(C Water and its preparation method *ρ Water and its preparation method *(t1gp-t1n)*T+1000*γ water vapor 1*T)＝6.97x1010/(4.18*1000*(90-55)*7920+1000*2366*7920)＝3.5t/h, primary water side water supply flow ：L Water and its preparation method 1g＝∑Q 1/(C Water and its preparation method *ρ Water and its preparation method (t1gp-t1h)*T)＝6.97x1010/(4.18*1000*(90-55)*7920)＝60m3/h, primary water side backwater flow ：L Water and its preparation method 1h＝L Water and its preparation method 1g-L condensed water 1＝60-3.5＝56.5m3/h,∑Q 2＝C Water and its preparation method *ρ Water and its preparation method *L Water and its preparation method 2(t2gp-t2h)*T(kJ)＝6.97x1010(kJ), secondary water side circulating water flow ：L Water and its preparation method 2＝∑Q 2/(C Water and its preparation method *ρ Water and its preparation method (t2gp-t2h)*T)＝6.97x1010/(4.18*1000*(85-50)*7920)＝60m3/h, in the vacuum phase heat exchange device 9 is determined, C Water and its preparation method is the specific heat capacity of water of 4.18 kJ/kg.K, ρ Water and its preparation method is the volume weight of water of 1000kg/m3, l Water and its preparation method 2 is the secondary water side circulating water flow (m 3/h),L Water and its preparation method 1g is the primary water side water supply flow m 3/h,L Water and its preparation method 1h is the primary water side backwater flow m 3/h,L Waste heat steam is the waste heat steam average flow of 4.0t/h (0.2 MPa), L water vapor 1 is the evaporation capacity of primary water vapor t/h, t 1gp is the average temperature of primary water supply at 90 ℃, t 1n is the temperature of primary water vapor condensation water at 55 ℃, t 1h is the temperature of primary water return water at 55 ℃, Gamma Waste heat steam is 2200kJ/kg (0.2 MPa) of residual heat vapor, gamma water vapor 1 is 2366kJ/kg (55 ℃) of primary vapor, t 2gp is 85 ℃ of secondary water supply average temperature, T 2h is the return water temperature of the secondary water of 50 ℃, T is the annual running time of the device of 7920 hours, and the evaporation condensation water quantity of the primary water in the vacuum phase conversion heat device 6 is equal to the evaporation quantity of the primary water, namely L condensed water 1＝L water vapor 1 =3.5T/h.
3. When the dust-containing waste heat steam directly heats water in the heating energy storage water tank 6, the primary water side circulation unit carries out wet purification on pollutants in the waste heat steam, so that the pollutants in the primary water side circulation unit can be gradually deposited at the bottom of the tank body of the heating energy storage water tank 6, the electric blow-down valve 21 can be periodically opened according to actual running conditions, and sewage is discharged into the drainage ditch 23 through the blow-down pipe 22.
4. After the device is operated according to the steps of the method, the annual energy generation of the waste heat steam recovery of the steel slag heat braising process is as follows: Σn= Σq 2*a/1000＝6.97x1010kJ*0.059/1000≈4x106 kWh, converted into ton of slag recovery electricity as: n=Σnjp=4x 6/62x104 =6.45 kWh/t slag, where Σq 2 is total heat kJ provided by the low temperature waste heat organic rankine cycle power generation device 14, a is a low temperature waste heat power generation coefficient, generally a=0.057-0.061 kWh/MJ, a=0.059 kWh/MJ is taken, and P is annual yield of steel slag braising production line 62 ten thousand t/a.
The using method of the dust-containing waste heat steam recycling device for the steel slag heat braising solves the problem that dust-containing waste heat steam generated in the steel slag pressure heat braising process cannot be recycled, reduces energy waste and environmental pollution, solves the problem of discontinuous steam supply of waste heat steam generated in the steel slag pressure heat braising process, can realize long-term continuous stable operation requirement of dust-containing waste heat steam recycling, saves energy sources, reduces enterprise operation cost, and has better energy-saving benefit, environmental protection benefit and economic benefit.
Claims (1)
1. The dust-containing waste heat steam recycling device for the steel slag braising is characterized by comprising a first steam valve (1), a steel slag braising steam pipe (2), a water tank direct heating steam pipe (3), a supplementing steam pipe (4), a second steam valve (5), a heating energy storage water tank (6), a primary water supply pump (7), a primary water supply pipe (8), a vacuum phase conversion device (9), a primary water first return pipe (10), a primary water return pump (11), a primary water second return pipe (12), a secondary water supply pipe (13), a low-temperature waste heat organic Rankine cycle power generation device (14), a secondary water first return pipe (15), a secondary water circulation pump (16), a secondary water second return pipe (17), a condensation water pipe (18), a water supplementing device (19), a water supplementing pipe (20), an electric sewage valve (21), a sewage pipe (22) and a drainage ditch (23);
The first steam valve (1), the steel slag braising steam pipe (2), the water tank direct heating steam pipe (3), the supplementing steam pipe (4), the second steam valve (5) and the heating energy storage water tank (6) form a dust-containing waste heat steam recovery heating and supplementing unit of the device;
the device comprises a heating energy storage water tank (6), a primary water supply pump (7), a primary water supply pipe (8), a vacuum phase conversion device (9), a primary water first return pipe (10), a primary water return pump (11) and a primary water second return pipe (12), wherein a primary water side circulation unit of the device is formed, and primary water absorbs residual heat steam heat in the heating energy storage water tank (6) to provide a primary water heat source for the vacuum phase conversion device (9);
the vacuum phase heat exchange device (9), a secondary water supply pipe (13), a low-temperature waste heat organic Rankine cycle power generation device (14), a secondary water first return pipe (15), a secondary water circulating pump (16) and a secondary water second return pipe (17) form a secondary water side circulating unit of the device;
the water supplementing device (19) and the water supplementing pipe (20) form a secondary water side circulating unit water supplementing device;
The electric blow-down valve (21), the blow-down pipe (22) and the drainage ditch (23) form a blow-down device for heating the energy storage water tank (6); the inlet end of the first steam valve (1) is connected with the waste heat steam outlet of the steel slag heat stewing device (100), the outlet end of the first steam valve (1) is connected with the inlet end of the steel slag heat stewing steam pipe (2), the outlet end of the steel slag heat stewing steam pipe (2) is connected with the inlet end of the direct heating steam pipe (3), the direct heating steam pipe (3) is arranged above a primary water inlet of the heating energy storage water tank (6), the outlet end of the supplementing steam pipe (4) is connected on the pipe section of the steel slag heat stewing steam pipe (2), the inlet end of the supplementing steam pipe (4) is connected with the outlet end of the second steam valve (5), the inlet end of the second steam valve (5) is connected with a steam pipe network in a steel mill area, the primary water outlet of the heating energy storage water tank (6) is connected with the water inlet of the primary water supply pump (7), the water outlet end of the primary water supply pipe (8) is connected with the primary water inlet of the vacuum phase conversion heat device (9), the water outlet end of the vacuum phase conversion heat device (9) is connected with the primary water inlet end of the primary water return water pump (11) and the primary water return water inlet end of the primary water pump (11, the water outlet end of the primary water second return pipe (12) is connected with the primary water inlet of the heating energy storage water tank (6), the secondary water outlet of the vacuum phase change heat device (9) is connected with the water inlet end of the secondary water supply pipe (13), the water outlet end of the secondary water supply pipe (13) is connected with the water inlet of the low-temperature waste heat organic Rankine cycle power generation device (14), the water outlet end of the low-temperature waste heat organic Rankine cycle power generation device (14) is connected with the water inlet end of the secondary water first return pipe (15), the water outlet end of the secondary water first return pipe (15) is connected with the water inlet end of the secondary water circulation pump (16), the water outlet end of the secondary water circulation pump (16) is connected with the water inlet end of the secondary water second return pipe (17), the water outlet end of the secondary water second return pipe (17) is connected with the secondary water inlet of the vacuum phase change heat device (9), the water outlet end of the vacuum phase change heat device (9) is connected with the water inlet end of the condensation pipe (18), the water outlet end of the condensation pipe (18) is connected with the water inlet end of the electric valve (20) of the electric water storage device (16), the water outlet end of the electric water storage device (20) is connected with the water inlet of the electric water inlet pipe (20) of the electric water storage device (20) and the sewage draining pipe (20) is connected with the sewage draining pipe (20), the water outlet end of the blow-down pipe (22) is led into the drainage ditch (23).
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221347042U true CN221347042U (en) | 2024-07-16 |
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