CN117090655A - Dust-containing waste heat steam recycling device and method for steel slag braising - Google Patents
Dust-containing waste heat steam recycling device and method for steel slag braising Download PDFInfo
- Publication number
- CN117090655A CN117090655A CN202311187614.0A CN202311187614A CN117090655A CN 117090655 A CN117090655 A CN 117090655A CN 202311187614 A CN202311187614 A CN 202311187614A CN 117090655 A CN117090655 A CN 117090655A
- Authority
- CN
- China
- Prior art keywords
- water
- steam
- heat
- pipe
- primary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002918 waste heat Substances 0.000 title claims abstract description 165
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 239000002893 slag Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000000428 dust Substances 0.000 title claims abstract description 45
- 238000004064 recycling Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 657
- 238000010438 heat treatment Methods 0.000 claims abstract description 94
- 238000004146 energy storage Methods 0.000 claims abstract description 62
- 230000001502 supplementing effect Effects 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- 238000010248 power generation Methods 0.000 claims abstract description 45
- 230000008569 process Effects 0.000 claims abstract description 30
- 238000011084 recovery Methods 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims description 33
- 239000010865 sewage Substances 0.000 claims description 17
- 238000009833 condensation Methods 0.000 claims description 15
- 230000005494 condensation Effects 0.000 claims description 15
- 238000001704 evaporation Methods 0.000 claims description 12
- 230000008020 evaporation Effects 0.000 claims description 12
- 239000003344 environmental pollutant Substances 0.000 claims description 11
- 231100000719 pollutant Toxicity 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 10
- 238000005338 heat storage Methods 0.000 claims description 8
- 238000000746 purification Methods 0.000 claims description 6
- 238000009834 vaporization Methods 0.000 claims description 6
- 230000008016 vaporization Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 9
- 239000000126 substance Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000003912 environmental pollution Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A dust-containing waste heat steam recycling device and method for steel slag heat braising belong to the technical field of waste heat recycling. The invention 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 invention 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 and method 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 Invention
The invention aims to provide a dust-containing waste heat steam recycling device and method for steel slag heat stewing, which solve the problem of disordered emission of dust-containing waste heat steam generated in the steel slag pressure heat stewing process, realize continuous and stable recycling of the rest of heat steam, reduce energy waste and environmental pollution, and have better economic benefit and environmental benefit.
The technical scheme of the invention 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 and a method for thermally stewing steel slag comprise the following steps: 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 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 waste heat 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 steel mill regional steam pipe network, 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 pump 7 is connected with the water inlet end of the primary water supply pipe 8, the water outlet end of the primary water supply pipe 8 is connected with the 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 sewage drain 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 steel slag stewing process is in normal operation, the generated waste heat steam sequentially passes through the first steam valve 1, the steel slag stewing steam pipe 2 and the water tank to directly heat the steam pipe 3, the primary water in the tank body of the heating energy storage water tank 6 is directly heated,after primary water absorbs heat directly heated by waste heat steam in a tank body of the heating energy storage water tank 6, the water temperature gradually rises, the primary water sequentially enters a vacuum phase conversion heat exchange device 9 through a primary water supply pump 7 and a primary water supply pipe 8 to carry out vacuum phase conversion heat exchange, the primary water subjected to heat exchange and temperature reduction sequentially flows back to the tank body of the heating energy storage water tank 6 for circulating heat exchange through a primary water first water return pipe 10, a primary water return pump 11 and a primary water second water return pipe 12, and condensed water subjected to phase conversion heat exchange also flows back to the tank body of the heating energy storage water tank 6 for circulating heat exchange through a condensed water pipe 18; 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 total heat Σq absorbed by the secondary water in the vacuum phase conversion means 9 during the whole operating time of the device 2 (i.e., the total heat provided by the low-temperature waste heat organic Rankine cycle power generation device 14) and the total heat Sigma Q released by the primary water in the vacuum phase conversion heat device 6 1 And total heat Sigma Q directly heated and released by waste heat steam in the tank body of the heating energy storage water tank 6 0 Equal, sigma Q 2 ＝∑Q 1 ＝∑Q 0 According to the calculation of the heat balance theory, the main operation parameters of the device are determined as follows: sigma Q 0 ＝L Waste heat steam *1000*γ Waste heat steam *T kJ，∑Q 1 ＝C Water and its preparation method *1000*L Steam 1 (t 1gp -t 1n )*T+L Steam 1 *1000*γ Steam 1 * Primary water vapor evaporation amount in the vacuum phase change heat transfer device 9: l (L) Steam 1 ＝∑Q 1 /(C Water and its preparation method *ρ Water and its preparation method *(t 1gp -t 1n )*T+1000*γ Steam 1 * T) T/h, primary water side water supply flow: l (L) Water 1g ＝∑Q 1 /(C Water and its preparation method *ρ Water and its preparation method (t 1gp -t 1h )*T)m 3 And/h, primary water side backwater flow: l (L) Water for 1h ＝L Water 1g -L Condensation water 1 ，∑Q 2 ＝C Water and its preparation method *ρ Water and its preparation method *L Water 2 (t 2gp -t 2h )*T m 3 And/h, secondary water side circulating water flow rate: l (L) Water 2 ＝∑Q 2 /(C Water and its preparation method *ρ Water and its preparation method (t 2gp -t 2h )*T)m 3 /h, wherein C Water and its preparation method Specific heat capacity kJ/kg.K, ρ of water Water and its preparation method Is the volume weight of water kg/m 3 ，L Water 2 Is the secondary water side circulating water flow m 3 /h，L Water 1g For supplying water flow m to the primary water side 3 /h，L Water for 1h Is the primary water side backwater flow m 3 /h，L Waste heat steam Is the flow t/h of waste heat steam, L Steam 1 Is the primary steam evaporation t/h, t 1gp Water is supplied to primary water at the average temperature of T DEG C 1n Is the temperature of primary water vapor condensed water, t 1h Is the temperature of the primary water backwater at the temperature of gamma Waste heat steam Is the vaporization latent heat kJ/kg of residual heat vapor, gamma Steam 1 Is the primary steam vaporization latent heat kJ/kg, t 2gp Water is supplied to secondary water at the average temperature of T DEG C 2h The temperature of the secondary water backwater is the temperature, T is the annual operation time h of the device, 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 Condensation water 1 Steam =l Steam turbine 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 waste heat of the steel slag heat stewing processThe annual energy production of steam recovery is: Σn= Σq 2 * a/1000kWh, the electric quantity recovered by converting the slag into ton is as follows: n= Σn/P, where Σq 2 The total heat kJ provided for the secondary water by the low-temperature waste heat organic Rankine cycle power generation device 14, a is the low-temperature waste heat power generation coefficient, generally a=0.057-0.061 kWh/MJ, and P is the annual yield t/a of the steel slag heat stewing production line.
The invention 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 and a method for thermally stewing steel slag comprise the following steps: 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 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 waste heat 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 steel mill regional steam pipe network, 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 pump 7 is connected with the water inlet end of the primary water supply pipe 8, the water outlet end of the primary water supply pipe 8 is connected with the 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 sewage drain 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 steel slag braising process is in normal operation, the generated waste heat steam sequentially passes through the first steam valve 1, the steel slag braising 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 absorbs heat directly heated by the waste heat steam in the tank body of the heating energy storage water tank 6, the water temperature is gradually increased, the primary water sequentially passes through the primary water supply pump 7 and the primary water supply pipe 8 to enter the vacuum phase change heat exchange device 9 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 to return to the tank body of the heating energy storage water tank 6 for circulation heat exchange, and the condensed water after the phase change heat exchange also flows back to the tank body of the heating energy storage water tank 6 for circulation heat exchange through the condensed water pipe 18; 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 requirement of the secondary heat in the vacuum phase conversion heat device 9The heat absorbed by the secondary water and the heat required by heat accumulation and temperature rise of the primary water are used for the other part; thus, the total heat Σq absorbed by the secondary water in the vacuum phase heat transfer device 9 during the entire operating time T (h) of the device 2 (i.e., the total heat provided by the low-temperature waste heat organic Rankine cycle power generation device 14) and the total heat Sigma Q released by the primary water in the vacuum phase conversion heat device 6 1 And total heat Sigma Q directly heated and released by waste heat steam in the tank body of the heating energy storage water tank 6 0 Equal, sigma Q 2 ＝∑Q 1 ＝∑Q 0 According to the calculation of the heat balance theory, the main operation parameters of the device are determined as follows: sigma Q 0 ＝L Waste heat steam *1000*γ Waste heat steam *T kJ＝4*1000*2200*7920＝6.97x10 10 kJ，∑Q 1 ＝C Water and its preparation method *1000*L Steam 1 (t 1gp -t 1n )*T+L Steam 1 *1000*γ Steam 1 *T(kJ)＝6.97x10 10 kJ, primary water vapor evaporation amount in the vacuum phase change heat exchange device 9: l (L) Steam 1 ＝∑Q 1 /(C Water and its preparation method *ρ Water and its preparation method *(t 1gp -t 1n )*T+1000*γ Steam 1 *T)＝6.97x10 10 /(4.18×1000×90-55×7920+1000×2366×7920) =3.5 t/h, primary water side water supply flow rate: l (L) Water 1g ＝∑Q 1 /(C Water and its preparation method *ρ Water and its preparation method (t 1gp -t 1h )*T)＝6.97x10 10 /(4.18*1000*(90-55)*7920)＝60m 3 And/h, primary water side backwater flow: l (L) Water for 1h ＝L Water 1g -L Condensation water 1 ＝60-3.5＝56.5m 3 /h,∑Q 2 ＝C Water and its preparation method *ρ Water and its preparation method *L Water 2 (t 2gp -t 2h )*T(kJ)＝6.97x10 10 (kJ), secondary water side circulation water flow: l (L) Water 2 ＝∑Q 2 /(C Water and its preparation method *ρ Water and its preparation method (t 2gp -t 2h )*T)＝6.97x10 10 /(4.18*1000*(85-50)*7920)＝60m 3 /h, wherein C Water and its preparation method Specific heat capacity of water 4.18 kJ/kg.K, ρ Water and its preparation method Is 1000kg/m of water volume weight 3 ，L Water 2 Is the flow (m) of the secondary water side circulating water 3 /h)，L Water 1g Is primary waterSide water supply flow m 3 /h，L Water for 1h Is the primary water side backwater flow m 3 /h，L Waste heat steam For the average flow rate of waste heat steam of 4.0t/h (0.2 MPa), L Steam 1 Is the primary steam evaporation t/h, t 1gp The average temperature of primary water supply is 90 ℃, t 1n The temperature of the primary water vapor condensed water is 55 ℃, t 1h The return water temperature of primary water is 55 ℃, gamma Waste heat steam 2200kJ/kg (0.2 MPa) of vaporization latent heat of residual heat vapor, gamma Steam 1 2366kJ/kg (55 ℃) as latent heat of vaporization of primary water vapor, t 2gp The average temperature of secondary water supply is 85 ℃, t 2h The return water temperature of the secondary water is 50 ℃, T is 7920 hours of annual operation time of the device, 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 Condensation water 1 ＝L Steam 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＝6.97x10 10 kJ*0.059/1000≈4x10 6 kWh, the electric quantity recovered by converting the kWh into ton slag is as follows: n= Σn/p=4x10 6 /62x10 4 =6.45 kWh/t slag, where Σq 2 The total heat kJ provided for the low-temperature waste heat organic Rankine cycle power generation device 14 by secondary water 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 62 ten thousand t/a of annual output of a steel slag heat stewing production line.
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 (3)
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 condensate 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 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; when the heat quantity of the residual heat of the steel slag is unstable and the device provides insufficient heat, a steam heat supplementing pipe can be used for providing supplementary heat for 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 conversion 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 device (9) is utilized to convert primary waste heat water containing more pollutants into cleaner secondary waste heat 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 secondary water side circulating unit water supplementing device, so that 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 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 waste heat 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 water outlet of the heating energy storage water tank (6) is connected with the water inlet of the primary water 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 device (9), the water outlet end of the primary water return pipe (9) is connected with the primary water inlet end of the primary water return pipe (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 sewage draining pipe (22) is led into the sewage draining ditch (23).
2. A dust-containing waste heat steam recycling method for steel slag heat stewing is characterized in that,
step one: after the primary water side circulation unit and the secondary water side circulation unit are filled with water, maintaining the necessary vacuum degree for the vacuum phase heat exchange device (9), and then sequentially starting a primary water supply pump (7), a primary water return pump (11) and a secondary water circulation pump (16), keeping the primary water side circulation unit and the secondary water side circulation unit continuously running, and when the secondary water supply temperature is more than or equal to 80 ℃, restarting the low-temperature waste heat organic Rankine cycle power generation device (14) to run;
step two: the recycling method is divided into 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 recycling device is normally operated, the primary water supply temperature is increased from 85 ℃ to 95 ℃, the primary water return temperature is controlled to be about 55 ℃, the secondary water supply temperature is controlled to be increased from 80 ℃ to 90 ℃, and the secondary water return temperature 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 recycling device normally operates, a first steam valve (1) is opened, a second steam valve (5) is closed, after the steel slag braising process operates normally, waste heat steam generated sequentially passes through the first steam valve (1), a steel slag braising steam pipe (2) and a water tank direct heating steam pipe (3), primary water in a tank body of the heating energy storage water tank (6) is directly heated, the primary water absorbs heat directly heated by the waste heat steam in the tank body of the heating energy storage water tank (6), the water temperature gradually rises, the primary water sequentially passes through a primary water supply pump (7) and a primary water supply pipe (8) to enter a vacuum phase conversion heat device (9) for vacuum phase conversion heat exchange, primary water after heat exchange and temperature reduction sequentially passes through a primary water first return pipe (10), a primary water return pump (11) and a primary water second return pipe (12) to flow back to the tank body of the heating energy storage water tank (6) for circulation heat exchange, and condensed water after phase conversion heat exchange also flows back to the tank body of the heating energy storage water tank (6) for circulation heat exchange through a condensation water pipe (18); 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 a 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) through a first water return pipe (15), a secondary water circulation pump (16) and a secondary water second water return pipe (17) for circulation heat exchange 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;
when the heat quantity of the residual heat of the steel slag is unstable and the heat provided by the recycling device is insufficient, the device can be provided with supplementary heat through a steam supplementary heat pipe;
thus, the total heat Sigma Q absorbed by the secondary water in the vacuum phase conversion heat device (9) is recovered and utilized in the whole operation time 2 Total heat Sigma Q released from primary water in vacuum phase change heat exchanger (6) 1 And total heat Sigma Q directly heated and released by waste heat steam in a tank body of a heating energy storage water tank (6) 0 Equal, sigma Q 2 ＝∑Q 1 ＝∑Q 0 ；
According to the calculation of the heat balance theory, the main operation parameters of the device are determined as follows: sigma Q 0 ＝L Waste heat steam *1000*γ Waste heat steam *T kJ，∑Q 1 ＝C Water and its preparation method *1000*L Steam 1 (t 1gp -t 1n )*T+L Steam 1 *1000*γ Steam 1 *T kJ；
Primary water vapor evaporation amount in the vacuum phase heat exchange device (9): l (L) Steam 1 ＝∑Q 1 /(C Water and its preparation method *ρ Water and its preparation method *(t 1gp -t 1n )*T+1000*γ Steam 1 *T)t/h；
Primary water side water supply flow rate: l (L) Water 1g ＝∑Q 1 /(C Water and its preparation method *ρ Water and its preparation method (t 1gp -t 1h )*T)m 3 /h；
Primary water side backwater flow rate: l (L) Water for 1h ＝L Water 1g -L Condensation water 1 ，∑Q 2 ＝C Water and its preparation method *ρ Water and its preparation method *L Water 2 (t 2gp -t 2h )*Tm 3 /h；
Secondary water side circulation water flow: l (L) Water 2 ＝∑Q 2 /(C Water and its preparation method *ρ Water and its preparation method (t 2gp -t 2h )*T)m 3 /h；
Wherein C is Water and its preparation method Specific heat capacity kJ/kg.K, ρ of water Water and its preparation method Is the volume weight of water kg/m 3 ，L Water 2 Is the secondary water side circulating water flow m 3 /h，L Water 1g For supplying water flow m to the primary water side 3 /h，L Water for 1h Is the primary water side backwater flow m 3 /h，L Waste heat steam Is the flow t/h of waste heat steam, L Steam 1 Is the primary steam evaporation t/h, t 1gp Water is supplied to primary water at the average temperature of T DEG C 1n Is the temperature of primary water vapor condensed water, t 1h Is the temperature of the primary water backwater at the temperature of gamma Waste heat steam Is the vaporization latent heat kJ/kg of residual heat vapor, gamma Steam 1 Is the primary steam vaporization latent heat kJ/kg, t 2gp Water is supplied to secondary water at the average temperature of T DEG C 2h The temperature of the secondary water backwater is the temperature, T is the annual operation time h of the device, and the primary time is in the vacuum phase change heat exchanger (6)The evaporation condensation amount of water is equal to the evaporation amount of primary water and is L Condensation water 1 ＝L Steam 1 ；
Step three: 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), an electric blow-down valve (21) can be periodically opened according to actual running conditions, and sewage is discharged into a drainage ditch (23) through a blow-down pipe (22).
3. The recycling method according to claim 2, wherein the recycling device is insufficient in heat supply, the second steam valve (5) is opened, the first steam valve (1) is closed, and the steam of the steam pipe network in the steel plant area can be used for supplying a supplementary steam heat source to the recycling device through the second steam valve (5) and the supplementary steam pipe (4), so that continuous and stable operation of the recycling device is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311187614.0A CN117090655A (en) | 2023-09-14 | 2023-09-14 | Dust-containing waste heat steam recycling device and method for steel slag braising |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311187614.0A CN117090655A (en) | 2023-09-14 | 2023-09-14 | Dust-containing waste heat steam recycling device and method for steel slag braising |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117090655A true CN117090655A (en) | 2023-11-21 |
Family
ID=88779229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311187614.0A Pending CN117090655A (en) | 2023-09-14 | 2023-09-14 | Dust-containing waste heat steam recycling device and method for steel slag braising |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117090655A (en) |
-
2023
- 2023-09-14 CN CN202311187614.0A patent/CN117090655A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11821637B2 (en) | Energy-saving system using electric heat pump to deeply recover flue gas waste heat from heat power plant for district heating | |
| CN100507375C (en) | Large temperature-difference central heating system | |
| CN109264914B (en) | Supercritical water oxidation energy comprehensive utilization system and energy recovery method | |
| CN201181044Y (en) | Large-temperature difference central heating unit | |
| CN106523053B (en) | Solar heat and steam power plant's coupled electricity-generation and hot energy storage combined system and implementation method | |
| CN110455088A (en) | A kind of solidifying gas formula generating set residual heat heating device and method of dry coke quenching superhigh temperature super-pressure | |
| CN203561221U (en) | Multi-functional waste heat utilization system | |
| CN102587884B (en) | Utilizing process for underground gasified gas condensate | |
| CN204678472U (en) | A kind of system of waste heat for heating reclaiming circulating cooling water of power plant | |
| CN110078904A (en) | A kind of polyester esterification steam waste heat utilizes method and device | |
| CN104213951B (en) | Waste heat of coke oven is multigroup to utilize system | |
| CN211650417U (en) | Desulfurization slurry cooling flue gas waste heat supply integrated system | |
| CN210483828U (en) | Energy-saving power generation and utilization system utilizing exhaust steam waste heat of steam turbine of thermal power plant | |
| CN109437239B (en) | Low-temperature waste heat recovery method and device for absorption process in acid making process | |
| CN116538826A (en) | System and method for recycling wet saturated flue gas waste heat of power station | |
| CN111336487A (en) | Coke oven raw gas and waste gas waste heat recycling system | |
| CN104061030B (en) | Garbage incinerating power plant low-temperature flue gas waste heat power generation system | |
| CN113175664B (en) | Recycling device and method for mixed working medium of feed water heating system | |
| CN206309434U (en) | Solar heat and steam power plant's coupled electricity-generation and hot energy storage combined system | |
| CN216342362U (en) | Solar combined heat and power system based on organic Rankine cycle and boiler auxiliary heating | |
| CN117090655A (en) | Dust-containing waste heat steam recycling device and method for steel slag braising | |
| CN2929478Y (en) | Heat conduction oil steam generator for recovering coking chemical products | |
| CN202970814U (en) | High-temperature steam waste heat electricity generation energy-saving system | |
| CN113638784A (en) | Solar combined heat and power system based on organic Rankine cycle and boiler auxiliary heating | |
| CN214666109U (en) | Waste heat recovery system capable of recycling smelting slag flushing water full heat |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |