CN201368448Y - Dry quenching steel afterheat generating set in iron and steel production technology - Google Patents
Dry quenching steel afterheat generating set in iron and steel production technology Download PDFInfo
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- CN201368448Y CN201368448Y CNU2008201841451U CN200820184145U CN201368448Y CN 201368448 Y CN201368448 Y CN 201368448Y CN U2008201841451 U CNU2008201841451 U CN U2008201841451U CN 200820184145 U CN200820184145 U CN 200820184145U CN 201368448 Y CN201368448 Y CN 201368448Y
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Abstract
The utility model provides a dry quenching steel afterheat generating set in an iron and steel production technology, which is characterized in that an outlet end (D) of high-temperature steel material (10) of a cooling air passage (1) of a dry quenching steel dry method cooling afterheat recycling part is connected with an air outlet of a high-temperature fan (9), an inlet end (C) of high-temperature steel material (10) of the cooling air passage (1) is connected with a superheater (3) by a high-temperature air passage (11); an air outlet of the superheater (3) is connected with an air inlet of combined heat source formed by an afterheat boiler (2) or the afterheat boiler (2) and the auxiliary heat source (12); the air outlet of the afterheat boiler is connected with the air inlet of the high-temperature fan (9); a water inlet of the afterheat boiler (2) or the water inlet of the combined heat source formed by the afterheat boiler (2) and the auxiliary heat source (12) is connected with circulating recycled water; a high-temperature vapor outlet of the combined heat source formed by the afterheat boiler (2) or the afterheat boiler (2) and the auxiliary heat source (12) is connected with a vapor inlet of superheater (3); a superheat vapor outlet of the superheater (3) is connected with steam turbine generators (4, 5); a low-pressure vapor outlet of the steam turbine generator (4) is connected with a vapor inlet of a condenser (6); a condensed water outlet of the condenser (6) is connected with the water inlet of the afterheat boiler (2) or the water inlet of the combined heat source formed by the afterheat boiler (2) and the auxiliary heat source (12) by devices such as a water pump and the like.
Description
Technical field
The utility model relates to the dried steel device for generating power by waste heat that puts out in a kind of process for producing steel and iron, belongs to iron and steel and produces energy-conserving and emission-cutting technology and cogeneration technology field.
Background technology
Iron and steel production belongs to highly energy-consuming, high pollution, maximum discharge industry, and the present iron and steel output of China has reached about 500,000,000 tons, other country considerably beyond the world, so energy-saving and emission-reduction pressure is huge, also exists huge energy-saving potential simultaneously.Having produced a large amount of waste heats in the steel manufacture process, how to have turned waste into wealth, effectively utilized this class used heat, is the important channel that steel industry improves efficiency of energy utilization, reduces environmental pollution.
Iron and steel production need expend a large amount of electric energy, aggravated the construction pressure of public electric wire net, steel plant are provided with power plant for self-supply usually, adopt blast furnace gas excess pressure power generating at present, the by-product gas that produces in the steel smelting procedure etc. carries out the residual air generating, reclaim a part of high-grade heat energy and carry out various power generating by remain energy measures such as cogeneration, apply at steel industry gradually, considerable energy-saving and emission-reduction benefit and economic benefit have been obtained, related power generating by remain energy is personal by steel plant usually, form the relation that is incorporated into the power networks and does not surf the Net with public electric wire net, relevant electric power application technology moves to maturity.
At present a large amount of waste heats of steel plant are to be no more than 150～200 ℃ low-grade energy form with temperature to exist; this type of thermal source is except using as heat supply, thermal de-aeration etc.; major part directly is discharged into outdoor owing to can't utilize, be unfavorable for the energy, water resource and environmental protection.
In iron and steel refining, work flow, for example after the molten steel moulding, since its temperature often up to 800～1200 ℃ about, adopt the novel dried steel dry method cooling residual heat recovery technology of putting out with heat recovery and to obtain high temperature air thermal source about 450～800 ℃, can generate electricity as the high-grade energy driving steam turbine by consumption, even can promote a large amount of low-grade energies and be used to increase generated output, to obtain more comprehensive utilization of energy benefit.
Summary of the invention
The purpose of this utility model and task are, develop a kind of steel dry method cooling system, adopt the dried steel method of putting out of air-cooled type or high-temperature phase change heat accumulation formula that the high-temperature steel material that the steel or the initial temperatures such as steel behind the high temperature rolling of steel-making aftershaping reaches about 700～1200 ℃ is carried out the dry method cooling, realize recuperation of heat simultaneously, can obtain 300～800 ℃ high temperature air thermal source, enter waste heat boiler and produce senior middle school's parameter superheated steam, driving steam turbine generating again, generating efficiency can reach more than 35～40%, thereby the purpose that realizes utilizing " used heat " in the technological process to produce high-grade energy, can also be used for generating by these a large amount of low parameter steam waste heats that exist of high-grade energy drive steel plant simultaneously, further improve steel plant's comprehensive utilization of energy efficient, reduce the public electric wire net capacity of installed generator.
Specific descriptions of the present utility model are:
The dried steel device for generating power by waste heat that puts out in a kind of process for producing steel and iron, put out steel method cooling residual heat recovery section and cogeneration part two parts are formed by dry air cooled or high-temperature phase change heat accumulation formula are dried, the wherein dried steel dry method cooling residual heat recovery section of putting out comprises cooling air channel 1, high-temperature blower 9, the heating surface of high temperature air channel 11 and superheater 3 that is used for recuperation of heat and waste heat boiler 2 is formed, after being heated to about 300～800 ℃ by high-temperature steel material 10, the cooling air is sent to superheater 3 and waste heat boiler 2 in cooling air channel, recirculated water is heated to be the superheated steam of HTHP, the pressure limit of superheated steam is 1～12MPa, temperature range is 300 ℃～550 ℃, be sent to steam turbine 4, and drive generator 5 generatings.
The inside that superheater 3 both can be arranged at waste heat boiler 2 consists of one, and the outside that also can be arranged at waste heat boiler 2 becomes stand-alone configuration.
Air-cooled type is dried to put out high-temperature steel material 10 and the direct contact heat-exchanging of high temperature circulation air in the steel device, the high-temperature phase change heat accumulation formula then is earlier with 14 heating of high-temperature phase change heat accumulation module by high-temperature steel material 10, by high-temperature phase change heat accumulation module 14 and high temperature circulation air contact heat-exchanging, be sent to superheater 3 and waste heat boiler 2 then again.
For the dried steel method of putting out of air-cooled type, because the generation of superheated steam depends on the cooling process of high-temperature steel material, when the cooling procedure of high-temperature steel material is continuous, therefore cogeneration also just can constantly continue, if but because the influence of various factors causes the cooling of high-temperature steel material to be interrupted, because waste heat can't store, so cogeneration also is forced to interrupt.Avoid the appearance of this state can consider to adopt auxiliary thermal source 12, this kind auxiliary thermal source both can adopt coal gas or coal-burning boiler to generate electricity as afterburning, also can adopt the waste-heat recovery device of a large amount of low parameter thermals source such as 0.2～0.6MPa low-pressure steam that exist in the process for producing steel and iron flow process, drive the low parameter heat resource power generation to increase generated energy.As the optimal design of power generation cycle, can consider to be provided with air vent pipework 13 and the low-pressure steam of auxiliary thermal source 12 be sent into the low-pressure stage of steam turbine 4 to improve efficiency of utilization.If certainly production line can keep oepration at full load for a long time, also can auxiliary thermal source 12 be set and only adopt waste heat boiler 2 to generate electricity as single steam source driving steam turbine.
For the high-temperature phase change heat accumulation formula, then can avoid the shortcoming of above-mentioned air-cooled type, carry out cogeneration separately, also can with other auxiliary thermal source cooperation.But high-temperature phase change heat accumulation formula initial cost is higher.
Steel plant adopt trunk to put out the steel cogeneration technology, different according to concrete iron and steel production and processing process, 1 ton of steel of every production about 25～60kWh that can generate electricity, on average about 40kWh, if according to 0.8 yuan of calculating of average electricity price, promptly can be steel plant and save about 32 yuan of electricity charge.For the medium steel plant of about 5,000,000 tons of annual productions, adopt the dried steel cogeneration technology that puts out can generate electricity about 200,000,000 kWh every year, can save about 1.6 hundred million yuan of the electricity charge every year.As promote this new technique system in the whole nation, if half iron and steel adopts in producing, can generate electricity about 10,000,000,000 kWh every year, can be steel industry and save 8,000,000,000 yuan of the electricity charge, and be equivalent to build less the coal-fired firepower power station of 4 500,000 kW.According to measuring and calculating, build a dried investment payback time of putting out steel cogeneration project usually to be about about 2～3 years.Therefore, this new technique has huge energy-conservation, reduction of discharging benefit, has good and economic and practicality simultaneously.
Description of drawings
Fig. 1 is that the utility model adopts the dried system schematic of putting out the steel method of air-cooled type, and Fig. 2 adopts the dried system schematic of putting out the steel method of high-temperature phase change heat accumulation formula.
Each unit number and title are as follows among Fig. 1,2:
Cooling air channel 1, waste heat boiler 2, superheater 3, steam turbine 4, generator 5, condenser 6, water pump 7, air-return duct 8, high-temperature blower 9, high-temperature steel material 10, high temperature air channel 11, auxiliary thermal source 12, air vent pipework 13, high-temperature phase change heat accumulation module 14, condenser coolant intake A, condenser cooling water outlet B, the entrance point C of high-temperature steel material, the port of export D of high-temperature steel material
The specific embodiment
Fig. 1, the 2nd, system schematic of the present utility model.
The dried specific embodiment of putting out the steel device for generating power by waste heat of the present utility model is identical with aforementioned specific descriptions of the present utility model, and this does not give unnecessary details.It is pointed out that the influence that in actual engineering, should take into full account aspects such as iron and steel production cycle and initial cost, the practical application mode is selected.Simultaneously, produce and the reality of using based on present State Grid, institute of steel plant generated energy usually can only be self-produced personal by steel plant, form the interface mode that is incorporated into the power networks and does not surf the Net with public electric wire net, bear stable power loads such as blower fan by cogeneration, insufficient section is replenished by public electric wire net, and when the cogeneration part because of maintenance needs etc. when out of service, but system's automatic seamless switches to public electric wire net.
Claims (4)
1, the dried steel device for generating power by waste heat that puts out in a kind of process for producing steel and iron, put out by air-cooled type or high-temperature phase change heat accumulation formula are dried that steel dry method cooling residual heat reclaims and cogeneration two parts are formed, it is characterized in that described dried high-temperature steel material (10) port of export (D) that puts out the cooling air channel (1) of steel dry method cooling residual heat recovery section links to each other with the air outlet of high-temperature blower (9), high-temperature steel material (10) entrance point (C) of cooling air channel (1) links to each other with superheater (3) by high temperature air channel (11), the air outlet of superheater (3) links to each other with the air inlet of the associating thermal source of auxiliary thermal source (12) composition with waste heat boiler (2) or waste heat boiler (2), the air outlet of waste heat boiler links to each other with the air inlet of high-temperature blower (9), the water inlet of waste heat boiler (2) or waste heat boiler (2) link to each other with circulating backwater with the water inlet of the associating thermal source that auxiliary thermal source (12) is formed, waste heat boiler (2) or waste heat boiler (2) link to each other with the steam inlet of superheater (3) with the high-temperature steam outlet of the associating thermal source that auxiliary thermal source (12) is formed, the superheated steam outlet and the steam turbine generator (4 of superheater (3), 5) link to each other, the low-pressure steam outlet of steam turbine (4) links to each other with the steam inlet of condenser (6), and the condensation-water drain of condenser (6) links to each other with the water inlet of the associating thermal source of auxiliary thermal source (12) composition with the water inlet or the waste heat boiler (2) of waste heat boiler (2) by equipment such as water pumps.
2, the dried steel device for generating power by waste heat that puts out in the process for producing steel and iron as claimed in claim 1, it is characterized in that the described cooling medium that carries out heat exchange with high-temperature steel material (10) cooling air channel (1) is the high temperature circulation air, wherein the dried steel device that puts out of air-cooled type is both direct ways of contact, the high-temperature phase change heat accumulation formula is the mediate contact mode, high-temperature steel material (10) contacts with high-temperature phase change heat accumulation module (14) earlier, and high-temperature phase change heat accumulation module (14) contacts with the high temperature circulation air again.
3, the dried steel device for generating power by waste heat that puts out in the process for producing steel and iron as claimed in claim 1, it is characterized in that the inside that described superheater (3) both can be arranged at waste heat boiler (2) consists of one, the outside that also can be arranged at waste heat boiler (2) becomes stand-alone configuration.
4, the dried steel device for generating power by waste heat that puts out in the process for producing steel and iron as claimed in claim 1, it is characterized in that described auxiliary thermal source (12) can be provided with or not be provided with air vent pipework (13) low-pressure steam of auxiliary thermal source (12) is sent into the low-pressure stage of steam turbine (4), also auxiliary thermal source (12) can be set and waste heat boiler (2) only be set as single steam source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201841451U CN201368448Y (en) | 2008-12-31 | 2008-12-31 | Dry quenching steel afterheat generating set in iron and steel production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201841451U CN201368448Y (en) | 2008-12-31 | 2008-12-31 | Dry quenching steel afterheat generating set in iron and steel production technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201368448Y true CN201368448Y (en) | 2009-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201841451U Expired - Fee Related CN201368448Y (en) | 2008-12-31 | 2008-12-31 | Dry quenching steel afterheat generating set in iron and steel production technology |
Country Status (1)
| Country | Link |
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| CN (1) | CN201368448Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107264A (en) * | 2010-12-30 | 2011-06-29 | 中国第一重型机械股份公司 | System for recycling ingot casting waste heat and working method thereof |
-
2008
- 2008-12-31 CN CNU2008201841451U patent/CN201368448Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107264A (en) * | 2010-12-30 | 2011-06-29 | 中国第一重型机械股份公司 | System for recycling ingot casting waste heat and working method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20101231 |