CN103344124A - Lime kiln waste gas waste heat electricity generating system with by-product coal gas afterburning function - Google Patents
Lime kiln waste gas waste heat electricity generating system with by-product coal gas afterburning function Download PDFInfo
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Abstract
The invention discloses a lime kiln waste gas waste heat electricity generating system with a by-product coal gas afterburning function. The lime kiln waste gas waste heat electricity generating system comprises a smoke valve, a waste heat boiler, a steam pocket, a turbine, a boiler water feeding pump, a condenser, a condensate water pump, a cooling tower, a deaerator, an electricity generator, an induced draft fan, an air blower, and a chimney. A combustion hearth, a high temperature super-heater, a low temperature super-heater, an evaporator and a coal economizer are sequentially arranged in the waste heat boiler from top to bottom, an outlet of the high temperature super-heater is connected with a steam inlet of the turbine through a pipeline, the waste heat boiler is provided with a lime kiln waste gas inlet and a by-product coal gas inlet, and an air blowing opening is additionally formed in an air inlet smoke pipe so as to provide oxygen needed by coal gas burning. The lime kiln waste gas waste heat electricity generating system with the by-product coal gas afterburning function can greatly increase smoke temperature, so that the temperature and the pressure of superheated steam at the inlet of the turbine are increased, and electricity generating capacity is improved.
Description
Technical field
The present invention relates to a kind of afterheat generating system, particularly a kind of limekiln exhaust gas afterheat generating system with the by-product gas afterburning.
Background technology
Existing limekiln exhaust gas afterheat generating system as shown in Figure 1, comprise gas fume valve 2, waste heat boiler 6, boiler feed pump 15, oxygen-eliminating device 14, steam turbine 9, condenser 11, drum 8, be provided with high temperature superheater 17, evaporimeter 19 and economizer 20 in the waste heat boiler 6 from top to bottom successively.
Waste heat boiler 6 import waste gas are from the limekiln preheater, about 350～400 ℃ of intake air temperature, this waste gas enters waste heat boiler 6, by being arranged in superheater, evaporimeter, the economizer in the boiler, progressively be cooled to 160～180 ℃, these waste gas are discharged in the atmosphere by chimney 1 through air-introduced machine 7.
Enter drum 8 get to the economizer heating of waste heat boiler 6 through boiler feed pump 15 from the boiler feedwater of oxygen-eliminating device 14 after, water in the drum 8 is got back in the drum 8 after evaporimeter heat absorption boiling by natural circulation mode, the saturated vapor of separating in the drum 8 becomes superheated steam after through the high temperature superheater heat absorption, enter steam turbine 9 expansion actings then, after condenser 11 coolings, become condensate water, get to oxygen-eliminating device 14 by condensate pump 13.
There is following problem in existing this limekiln exhaust gas afterheat generating system:
1, the limekiln exhaust gas temperature is low, so the superheated steam parameter is low, system thermal efficiency is low, and generated energy is few.
2, the attached limekiln production line of general steel plant has blast furnace gas more than needed or coal gas of converter in gaspipe network, can utilize these surplus gas to increase generated energy.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art with not enough, a kind of raising EGT is provided, make the temperature and pressure of steam turbine import superheated steam be improved, can increase the limekiln exhaust gas afterheat generating system of the band by-product gas afterburning of generating capacity.
Purpose of the present invention is achieved through the following technical solutions:
The limekiln exhaust gas afterheat generating system of band by-product gas afterburning of the present invention, comprise gas fume valve, waste heat boiler, drum, boiler feed pump, condenser, condensate pump, cooling tower, oxygen-eliminating device, steam turbine, generator, air-introduced machine and chimney, be provided with burner hearth in the described waste heat boiler, high temperature superheater, low temperature superheater, evaporimeter and economizer, described burner hearth is provided with an exhaust gas inlet, also be provided with a gas inlet on the described burner hearth, described boiler feed pump links to each other with the import of economizer, the outlet of described economizer links to each other with the water inlet of drum, the water inlet of described evaporimeter links to each other with the delivery port of drum, the outlet of described evaporimeter links to each other with the vapour-liquid two-phase import of drum, described low temperature superheater air intake links to each other with the venthole of drum, the venthole of described low temperature superheater links to each other with the air intake of high temperature superheater, and the venthole of described high temperature superheater links to each other with the air intake of steam turbine.
Preferably, described burner hearth, high temperature superheater, low temperature superheater, evaporimeter and economizer set gradually in waste heat boiler from top to bottom.
Preferably, described evaporimeter is high pressure evaporator, described economizer comprises high-temperature economizer and low temperature province coal gas, also be provided with high-pressure superheater in the waste heat boiler, low-pressure superheater, low pressure evaporator and low-level (stack-gas) economizer, described drum is divided into high pressure drum and low-pressure drum, described boiler feed pump links to each other with the import of low-level (stack-gas) economizer, the outlet of described low-level (stack-gas) economizer links to each other with the water inlet of the import of high-temperature economizer and low-pressure drum, the water inlet of described low pressure evaporator links to each other with the delivery port of low-pressure drum, the outlet of described low pressure evaporator links to each other with the vapour-liquid two-phase import of low-pressure drum, the air intake of described low-pressure superheater links to each other with the venthole of low-pressure drum, the venthole of described low-pressure superheater links to each other with the low pressure admission mouth of steam turbine, also link to each other with the oxygen-eliminating device steam inlet, the delivery port of described high-temperature economizer links to each other with the water inlet of high pressure drum, the water inlet of described high pressure evaporator links to each other with the delivery port of high pressure drum, the delivery port of described high pressure evaporator links to each other with the vapour-liquid two-phase import of high pressure drum, the import of described high-pressure superheater links to each other with the venthole of high pressure drum, and the outlet of described high-pressure superheater links to each other with the high-pressure admission mouth of steam turbine.
Preferably, described burner hearth, high-pressure superheater, high pressure evaporator, high-temperature economizer, low-pressure superheater, low pressure evaporator and low-level (stack-gas) economizer set gradually in waste heat boiler from top to bottom.
Preferably, described exhaust gas inlet is positioned at the side of burner hearth, and described gas inlet is positioned at the top of burner hearth.
Preferably, described waste heat boiler bottom is provided with waste gas outlet, connects chimney after described waste gas outlet and air-introduced machine join and is discharged into atmosphere.
Preferably, electricity generation system of the present invention also comprises generator, and described generator is connected with steam turbine.
Preferably, electricity generation system of the present invention also comprises condensing mechanism, described condensing mechanism comprises condenser, condensate pump and cooling tower, described condenser one end connects steam turbine, the other end connects condensate pump, the recirculated water entrance of described cooling tower is connected with the circulating water outlet of condenser, and the circulating water outlet of cooling tower is connected with the recirculated water entrance of condenser.
Preferably, electricity generation system of the present invention also is provided with oxygen-eliminating device between boiler feed pump and condensing mechanism.
Preferably, electricity generation system of the present invention also comprises air blast, before described air blast is arranged on exhaust gas inlet.
The present invention has following advantage and effect with respect to prior art:
1, waste heat boiler top employing by-product gas afterburning of the present invention significantly improves flue-gas temperature, has increased steam parameter, has improved the acting ability of steam, has increased generated energy.In addition, through after the low-level (stack-gas) economizer heat absorption, major part enters high-temperature economizer and continues heat absorption, enters the high pressure drum then earlier in the feedwater that boiler feed pump comes out, fraction enters low-pressure drum, the water of low-pressure drum and steam are in the heat absorption of low-temperature flue gas section, and the water of high pressure drum and steam have reduced heat transfer temperature difference in the heat absorption of high-temperature flue gas section, reduced the entropy product, increase the high steam parameter simultaneously, improved the acting ability of steam, increased generated energy.
2, the present invention increases the afterburning exhaust gas volumn under the situation that limekiln exhaust gas breaks down, and can keep afterheat generating system and continue operation, avoids afterheat generating system to shut down because of the limekiln fault, thereby improves the reliability of afterheat generating system.
Description of drawings
Fig. 1 is existing limekiln exhaust gas afterheat generating system structural representation.
Fig. 2 is the structural representation of the embodiment of the invention one.
Fig. 3 is the structural representation of the embodiment of the invention two.
The drawing reference numeral explanation
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment one
The structure of present embodiment as shown in Figure 2, the limekiln exhaust gas afterheat generating system of band by-product gas afterburning, comprise gas fume valve 2, waste heat boiler 6, drum 8, steam turbine 9, generator 10, condenser 11, cooling tower 12, condensate pump 13, oxygen-eliminating device 14, boiler feed pump 15, air-introduced machine 7, air blast 3 and chimney 1, be provided with burner hearth 5 in the waste heat boiler 6 from top to bottom successively, high temperature superheater 17, low temperature superheater 18, evaporimeter 19 and economizer 20, the burner hearth 5 of waste heat boiler 6 is provided with an exhaust gas inlet 4, also be provided with a gas inlet 16, boiler feed pump 15 links to each other with the import of economizer 20, the outlet of economizer 20 links to each other with the water inlet of drum 8, the water inlet of evaporimeter 19 links to each other with the delivery port of drum 8, the outlet of evaporimeter 19 links to each other with the vapour-liquid two-phase import of drum 8, low temperature superheater 18 air intakes link to each other with the venthole of drum 8, the venthole of low temperature superheater 18 links to each other with the air intake of high temperature superheater 17, and the venthole of high temperature superheater 17 links to each other with the air intake of steam turbine 9.Waste heat boiler 6 bottoms are provided with waste gas outlet, and these waste gas are discharged in the atmosphere by chimney 1 through air-introduced machine 7.
The cold wind that air blast 3 is introduced in the environment, air-introduced machine 7 imports link to each other with waste heat boiler 6 gas outlets, and air-introduced machine 7 air-out enter in the atmosphere through chimney 1.The limekiln exhaust gas temperature is generally at 350～400 ℃, flue gas after burner hearth 5 and gas-fired mixes back (temperature is generally at 550～600 ℃), pass through high temperature superheater 17, low temperature superheater 18, evaporimeter 19 and economizer 20 from top to bottom successively, the temperature that waste gas goes out waste heat boiler 6 generally is 160～180 ℃.
Enter drum 8 got to economizer 20 heating of waste heat boiler 6 by boiler feed pump 15 from the boiler feedwater of oxygen-eliminating device 14 after.Water in the drum 8 arrives drum 8 by natural circulation mode after evaporimeter 19 heat absorption boilings, the saturated vapor of separating from drum 8 is after low temperature superheater 18 and high temperature superheater 17 are overheated, enter the acting of expanding in the steam turbine 9, exhaust steam after the acting becomes condensate water through condenser 11 coolings, by condensate pump 13 it is got to oxygen-eliminating device 14.
Owing to adopted the by-product gas afterburning to make EGT bring up to 550～600 ℃, significantly improved the flue-gas temperature that enters in waste heat boiler 6 stoves, improved the superheated steam parameter (medium temperature and medium pressure) that enters steam turbine 9, improve acting ability and the therrmodynamic system Rankine cycle efficient of steam, increased generated energy.
Under the situation about breaking down in the limekiln, increase the afterburning exhaust gas volumn, can keep afterheat generating system and continue operation, avoid afterheat generating system to shut down because of the limekiln fault, thereby improve the reliability of afterheat generating system.
Embodiment two
The structure of present embodiment as shown in Figure 3, be with the difference of embodiment one: be provided with burner hearth 5 in the waste heat boiler 6 from top to bottom successively, high-pressure superheater 17 ＇, high pressure evaporator 191, high-temperature economizer 201, low-pressure superheater 18 ＇, low pressure evaporator 192 and low-level (stack-gas) economizer 202, drum is divided into high pressure drum 82 and low-pressure drum 81, boiler feed pump 15 links to each other with the import of low-level (stack-gas) economizer 202, the outlet of low-level (stack-gas) economizer 202 links to each other with the import of high-temperature economizer 201 and the water inlet of low-pressure drum 81, the water inlet of low pressure evaporator 192 links to each other with the delivery port of low-pressure drum 81, the outlet of low pressure evaporator 192 links to each other with the vapour-liquid two-phase import of low-pressure drum 81, the air intake of low-pressure superheater 18 ＇ links to each other with the venthole of low-pressure drum 81, the venthole of low-pressure superheater 18 ＇ links to each other with the low pressure admission mouth of steam turbine 9, also the steam inlet with oxygen-eliminating device 14 links to each other, the delivery port of high-temperature economizer 201 links to each other with the water inlet of high pressure drum 82, the water inlet of high pressure evaporator 191 links to each other with the delivery port of high pressure drum 82, the delivery port of high pressure evaporator 191 links to each other with the vapour-liquid two-phase import of high pressure drum 82, the import of high-pressure superheater 17 ＇ links to each other with the venthole of high pressure drum 82, and the outlet of high-pressure superheater 17 ＇ links to each other with the high-pressure admission mouth of steam turbine 9.
The limekiln exhaust gas temperature is generally at 350～400 ℃, flue gas after burner hearth 5 and gas-fired mixes back (temperature is generally at 550～600 ℃), pass through high-pressure superheater 17 ＇, high pressure evaporator 191, high-temperature economizer 201, low-pressure superheater 18 ＇, low pressure evaporator 192 and low-level (stack-gas) economizer 202 from top to bottom successively, the temperature that waste gas goes out waste heat boiler 6 generally is 140～160 ℃.
The high-pressure superheater 17 ＇ outlet of waste heat boiler 6 links to each other with steam turbine 9 high-pressure admission mouths by pipeline, and low-pressure superheater 18 ＇ outlet links to each other with steam turbine 9 low pressure admission mouths by pipeline, and also the steam inlet with oxygen-eliminating device 14 links to each other.Divide two-way from the low-level (stack-gas) economizer 202 heating backs that the boiler feedwater of oxygen-eliminating device 14 is got to waste heat boiler 6 by boiler feed pump 15, the one tunnel enters low-pressure drum 81, and another road enters high-temperature economizer 201.Water in high pressure drum 82 and the low-pressure drum 81 is respectively hung oneself by natural circulation mode and is arrived drum separately after high pressure evaporator 191 and the low pressure evaporator 192 heat absorption boilings, the saturated vapor of separating from high pressure drum 82 and low-pressure drum 81 is after superheater separately is overheated, high pressure superheated steam and low-pressure superheated steam have been become, enter the height of steam turbine 9 respectively, the acting of in steam turbine 9, expanding of low pressure admission mouth, part low-pressure superheated steam also enters oxygen-eliminating device 14 heated feed waters, exhaust steam after the acting becomes condensate water through condenser 11 coolings, by condensate pump 13 it is got to oxygen-eliminating device 14.
Owing to adopted dual pressure system, the water of low-pressure drum 8 and steam absorb heat in the low-temperature flue gas section, the water of high pressure drum 82 and steam absorb heat in the high-temperature flue gas section, reduced heat transfer temperature difference, reduced the entropy product, increase the high steam parameter (medium temperature and medium pressure) that enters steam turbine 9 simultaneously, improved the acting ability of steam, increased generated energy.Owing to adopted the by-product gas afterburning, significantly improved the flue-gas temperature in the waste heat boiler 6, improve the temperature and pressure of steam turbine 9 import superheated steams, thereby increased generating capacity.
Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. limekiln exhaust gas afterheat generating system with the by-product gas afterburning, comprise gas fume valve (2), waste heat boiler (6), drum (8), steam turbine (9), boiler feed pump (15), air-introduced machine (7) and chimney (1), it is characterized in that: be provided with burner hearth (5) in the described waste heat boiler (6), high temperature superheater (17), low temperature superheater (18), evaporimeter (19) and economizer (20), described burner hearth (5) is provided with an exhaust gas inlet (4), also be provided with a gas inlet (16) on the described burner hearth (5), described boiler feed pump (15) links to each other with the import of economizer (20), the outlet of described economizer (20) links to each other with the water inlet of drum (8), the water inlet of described evaporimeter (19) links to each other with the delivery port of drum (8), the outlet of described evaporimeter (19) links to each other with the vapour-liquid two-phase import of drum (8), described low temperature superheater (18) air intake links to each other with the venthole of drum (8), the venthole of described low temperature superheater (18) links to each other with the air intake of high temperature superheater (17), and the venthole of described high temperature superheater (17) links to each other with the air intake of steam turbine (9).
2. the limekiln exhaust gas afterheat generating system of band by-product gas afterburning according to claim 1, it is characterized in that described burner hearth (5), high temperature superheater (17), low temperature superheater (18), evaporimeter (19) and economizer (20) set gradually from top to bottom in waste heat boiler (6).
3. the limekiln exhaust gas afterheat generating system of band by-product gas afterburning according to claim 1, it is characterized in that, described evaporimeter is high pressure evaporator, described economizer comprises high-temperature economizer (201) and low temperature province coal gas (202), also be provided with high-pressure superheater (17 ＇) in the waste heat boiler (6), low-pressure superheater (18 ＇), low pressure evaporator (192) and low-level (stack-gas) economizer (202), described drum is divided into high pressure drum (82) and low-pressure drum (81), described boiler feed pump (15) links to each other with the import of low-level (stack-gas) economizer (202), the outlet of described low-level (stack-gas) economizer (202) links to each other with the import of high-temperature economizer (201) and the water inlet of low-pressure drum (81), the water inlet of described low pressure evaporator (192) links to each other with the delivery port of low-pressure drum (81), the outlet of described low pressure evaporator (192) links to each other with the vapour-liquid two-phase import of low-pressure drum (81), the air intake of described low-pressure superheater (18 ＇) links to each other with the venthole of low-pressure drum (81), the venthole of described low-pressure superheater (18 ＇) links to each other with the low pressure admission mouth of steam turbine (9), also the steam inlet with oxygen-eliminating device (14) links to each other, the delivery port of described high-temperature economizer (201) links to each other with the water inlet of high pressure drum (82), the water inlet of described high pressure evaporator (191) links to each other with the delivery port of high pressure drum (82), the delivery port of described high pressure evaporator (191) links to each other with the vapour-liquid two-phase import of high pressure drum (82), the import of described high-pressure superheater (17 ＇) links to each other with the venthole of high pressure drum (82), and the outlet of described high-pressure superheater (17 ＇) links to each other with the high-pressure admission mouth of steam turbine (9).
4. the limekiln exhaust gas afterheat generating system of band by-product gas afterburning according to claim 3, it is characterized in that described burner hearth (5), high-pressure superheater (17 ＇), high pressure evaporator (191), high-temperature economizer (201), low-pressure superheater (18 ＇), low pressure evaporator (192) and low-level (stack-gas) economizer 202) in waste heat boiler (6), set gradually from top to bottom.
5. according to the limekiln exhaust gas afterheat generating system of claim 1 or 3 described band by-product gas afterburnings, it is characterized in that: described exhaust gas inlet (4) is positioned at the side of burner hearth (5), and described gas inlet (16) is positioned at the top of burner hearth (5).
6. according to the limekiln exhaust gas afterheat generating system of claim 1 or 3 described band by-product gas afterburnings, it is characterized in that: described waste heat boiler (6) bottom is provided with waste gas outlet, connects chimney (1) after described waste gas outlet and air-introduced machine (7) join and is discharged into atmosphere.
7. according to the limekiln exhaust gas afterheat generating system of claim 1 or 3 described band by-product gas afterburnings, it is characterized in that also comprise generator (10), described generator (10) is connected with steam turbine.
8. according to the limekiln exhaust gas afterheat generating system of claim 1 or 3 described band by-product gas afterburnings, it is characterized in that, also comprise condensing mechanism, described condensing mechanism comprises condenser (11), condensate pump (13) and cooling tower (12), described condenser one end connects steam turbine, the other end connects condensate pump, and the recirculated water entrance of described cooling tower is connected with the circulating water outlet of condenser, and the circulating water outlet of cooling tower is connected with the recirculated water entrance of condenser.
9. the limekiln exhaust gas afterheat generating system of band by-product gas afterburning according to claim 8 is characterized in that, also is provided with oxygen-eliminating device (14) between boiler feed pump (15) and condensing mechanism.
10. according to the limekiln exhaust gas afterheat generating system of claim 1 or 3 described band by-product gas afterburnings, it is characterized in that also comprise air blast (3), it is preceding that described air blast is arranged on exhaust gas inlet (4).
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| CN103899365A (en) * | 2014-03-02 | 2014-07-02 | 成都成发科能动力工程有限公司 | Power generation device and method using medium-temperature and medium-pressure steam and low-pressure saturated steam in metallurgical industry |
| CN104004879A (en) * | 2014-06-11 | 2014-08-27 | 中冶南方工程技术有限公司 | Equipment and method for recovering low-temperature-section waste heat of primary converter flue gas |
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| CN108591985A (en) * | 2018-06-27 | 2018-09-28 | 江苏太湖锅炉股份有限公司 | A kind of combined type afterheat utilizing system structure |
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