CN104045069B - A kind of steam used for Phosphoric Acid Concentration system carries out the method for pressure and temperature reducing - Google Patents
A kind of steam used for Phosphoric Acid Concentration system carries out the method for pressure and temperature reducing Download PDFInfo
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- CN104045069B CN104045069B CN201410249748.5A CN201410249748A CN104045069B CN 104045069 B CN104045069 B CN 104045069B CN 201410249748 A CN201410249748 A CN 201410249748A CN 104045069 B CN104045069 B CN 104045069B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention discloses a kind of method that steam used for Phosphoric Acid Concentration system carries out pressure and temperature reducing.Arrange a cogeneration steam turbine at the admission end of graphite heat exchanger, the low-pressure steam of outer tube is connected via the admission end of admission valve with cogeneration steam turbine, and the steam after pressure and temperature reducing is connected with the admission end of graphite heat exchanger via vapor cock.Cogeneration steam turbine drags 1 1000kw asynchronous generator by 1 cover 1000KW hot merit Steam Turbine and forms.The electricity that asynchronous generator sends outputs to graphite heat exchanger for propeller pump.Present invention achieves the automatic adjustment of steam cycle parameter, avoid vapor temperature and pressure surge to the infringement of graphite heat exchanger, reduce phosphoric acid production cost.Recovered steam can with can and convert high-grade electric energy to, improve efficiency of energy utilization, save energy, cuts the waste.
Description
Technical field
The invention belongs to phosphoric acid production technical field, specifically relate to a kind of method that steam used for Phosphoric Acid Concentration system carries out pressure and temperature reducing.
Background technology
In existing Phosphoric Acid Concentration system, the reduced vapor consumption of every complete equipment is 30 ~ 37T/h.Generally enter into the low-pressure steam pressure 0.6Mpa of Phosphoric Acid Concentration battery limit (BL), temperature 200 ~ 240 DEG C.According to concentrated Controlling Technology index request, the low-pressure steam pressure entering concentrated graphite heat exchanger should be reduced to 0.18 ~ 0.21MPa, and temperature is 127 ~ 133 DEG C.Traditional pressure and temperature reducing mode needs directly to be sprayed onto by de-salted water in the steam in reducing-and-cooling plant.Vapor pressure is controlled by regulating loop, and vapor pressure is too high, exceedes sour interchanger graphite tubulation withstand voltage, graphite tubulation can be caused to damage; And vapor pressure is too low, band water is serious, can impact graphite tubulation equally, graphite tubulation is damaged.Same, vapor temperature is also regulate the desalination water yield joining steam temperature reducing and pressure reducing facility to control by regulating loop, and temperature is too high or too low all can damage graphite tubulation.In addition, also there is the problem of the available loss of energy in traditional pressure and temperature reducing mode, causes energy dissipation.How to overcome these problems, in prior art, there is not yet good terms of settlement.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, provide a kind of low-pressure steam used for Phosphoric Acid Concentration system to carry out the method for pressure and temperature reducing, improve efficiency of energy utilization, save energy, protection graphite heat exchanger.
Object of the present invention is achieved by the following technical programs.
A kind of steam used for Phosphoric Acid Concentration system carries out the method for pressure and temperature reducing, it is characterized in that: at the admission end of graphite heat exchanger, a cogeneration steam turbine is set, the low-pressure steam of outer tube is connected via the admission end of admission valve with cogeneration steam turbine, and the steam after pressure and temperature reducing is connected with the admission end of graphite heat exchanger via vapor cock; Described cogeneration steam turbine drags 1 1000kw asynchronous generator by 1 cover 1000KW hot merit Steam Turbine and forms.
Cogeneration steam turbine drags asynchronous generator by parallel shafts, and the electricity that asynchronous generator sends outputs to graphite heat exchanger for propeller pump.
Relative to prior art, the present invention has the following advantages:
1, the present invention initiates while utilizing low-pressure steam differential pressure power generation, ensures that the vapor temperature entering phosphoric acid graphite heat exchanger is in normal index scope.Avoid vapor temperature and pressure surge to the infringement of graphite heat exchanger, reduce phosphoric acid production cost.
2, the method efficiently solves Phosphoric Acid Concentration system exists available loss of energy problem by traditional pressure and temperature reducing mode, recovered steam can with can and convert high-grade electric energy to, improve efficiency of energy utilization, save energy, cuts the waste.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of prior art;
Fig. 2 is the process flow diagram of the inventive method.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail, but drawings and Examples are not limitation of the invention.
Embodiment 1
As shown in Figure 1, adopt the method for spray de-salted water to steam temperature reducing and pressure reducing in existing Phosphoric Acid Concentration system, owing to needing directly to be sprayed onto by de-salted water in the steam in reducing-and-cooling plant, cause that graphite tubulation in graphite heat exchanger breaks, booster.
As shown in Figure 2, existing Phosphoric Acid Concentration system is transformed, replace traditional spray de-salted water reducing-and-cooling plant with cogeneration steam turbine.
The environment for use of graphite heat exchanger requires that steam flow is stable, do not allow fluctuation.Although graphite heat exchanger corrosion resistance and good, heat transfer property is good, the easy fouling of heat-transfer surface, and the easy embrittlement of graphite, bending resistance and tensile strength low, thus can only be used for low pressure, the operating pressure of graphite is generally also only 0.6Mpa ~ 0.2Mpa.The vapor pressure of graphite heat exchanger is at 0.18 ~ 0.21MPa.
In transformation, Phosphoric Acid Concentration system often overlap have 30 ~ 37t/h steam need from 0.65MPa be down to 0.18 ~ 0.21MPa use, difficult point maximum in transformation process is to ensure that turbine discharge meets that the vapor temperature entering graphite heat exchanger remains between 127 ~ 133 DEG C, pressure at 0.18 ~ 0.21MPa, and definitely can not be with water.
Modification scheme: the steam output end being connected cogeneration steam turbine at the admission end of graphite heat exchanger by valve, cogeneration steam turbine admission end connects steam outer tube by valve.
Often overlap concentration systems and increase steam turbine admission pipeline (DN350) 15 meters, increase steam turbine admission end pneumatil control valve (DN350, PN1.6) 1 and be incorporated to; Increase steam turbine by-pass (short valve of hot merit Steam Turbine) pipeline (DN250) about 10 meters simultaneously, increase steam turbine by-pass pneumatil control valve (DN300, PN1.6) 1 and be incorporated to.Increase turbine discharge pipeline (DN450) 40 meters, increase turbine discharge end pneumatil control valve (DN450, PN1.0) 1 and be incorporated to.1 1000KW hot merit steam turbine is adopted to drag 1 1000KW asynchronous generator.This Steam Turbine admission pressure is 0.65 ~ 0.9MPa, temperature 200-240 DEG C, exhaust steam pressure 0.18 ~ 0.21MPa, exhaust temperature 130 ~ 140 DEG C, saturation steam steam being down between 127 ~ 133 DEG C through hot merit Steam Turbine equipment uses for graphite heat exchanger (design use temperature 127 ~ 133 DEG C, design pressure 0.18 ~ 0.21MPa); Steam turbine throttle flow 30 ~ 37T/H, design power 1000KW, steam turbine specified speed 3000 revs/min.
Steam Turbine utilizes the heat energy of steam to drag asynchronous generator generating, reaches again the object reclaiming heat energy and carry out generating electricity, also protect graphite heat exchanger simultaneously while steam regulation processing parameter.And the adjustment of steam cycle parameter can also control automatically.Namely turbine speed steam regulation pressure is used, by steam discharge by-pass steam regulation temperature.Specifically: after cogeneration steam turbine design temperature, its exhaust temperature is determined by by-pass self-regulated valve, and exhaust temperature its by-pass self-regulated valve high just closes a little, and exhaust temperature its by-pass self-regulated valve low is just made war, and reaches the temperature-stable entering graphite heat exchanger.The vapor temperature of graphite heat exchanger remains on 127 ~ 133 DEG C of scopes.And its meeting of steam outer tube fluctuation automatic adjustment rotating speed carry out balance row steam pressure after cogeneration steam turbine power generation equipment setting pressure, namely outer its faster rotational speed of pipe pressure height, outer pipe pressure its spin down low, thus ensure exhaust steam pressure, reach the pressure-stabilisation entering graphite heat exchanger.
Phosphoric Acid Concentration system sets up energy-conservation comparison before and after steam turbine power generation unit:
1, reduced vapor consumption is not affected.
2, be there is the problem of the available loss of energy by traditional pressure and temperature reducing mode by energy-conservation technological transformation solution Phosphoric Acid Concentration system, improve comprehensive utilization rate of energy source, save energy, cuts the waste.
3, power savings highly significant, the first half of the year in 2013, actual amount of electricity saving was as follows:
Phosphoric acid 200,000 tons concentrated A series steam turbine power generation amount: 3171950Kwh
Phosphoric acid 200,000 tons concentrated B series steam turbine power generation amount: 1116180Kwh
The concentrated steam turbine power generation amount of phosphoric acid 80,000 tons: 332136Kwh
Add up to amount of electricity saving: 4620266Kwh,
Brownout cost (calculating by 0.38 yuan/Kwh): 1755701.08 yuan
4, guarantee that graphite heat exchanger is full, excellent, long running, often overlap Phosphoric Acid Concentration system long-term operation and extend to 30 days by original 25-27 days.Thus ensure that the output of phosphoric acid and follow-up chemical fertilizer products is unaffected, this measure is obviously better than level of the same trade.
Embodiment 2
Modification scheme is with embodiment 1.When the fluctuation of outer tube vapor pressure is comparatively up to arriving 0.9MPa, before transformation, pressure reducing mode is undertaken by spray de-salted water pressure and temperature reducing, vapour technic index is used for ensureing to concentrate, want continuous controlling opening of valve to meet and concentrated use vapour index, cause valve decline in work-ing life, and frequent operation, require higher to operator, steam is easily with water.After modification, after setting up generating set, turbine rotor tachyphylaxis is very fast, and steam turbine rises to 4200 revs/min by specified speed 3000 revs/min, causes concentrated steam consumption slight fluctuations.This is because unnecessary ability is converted into electric energy.Exhaust steam pressure is 0.21MPa, stabilizes the low-pressure steam pressure into graphite heat exchanger, stabilizes concentrated production.Often overlap Phosphoric Acid Concentration long-term operation and reach 30 days.
Embodiment 3
Modification scheme is with embodiment 1.0.65MPa is reached when the fluctuation of outer tube vapor pressure is lower, before transformation, voltage regulation way is undertaken by spray de-salted water pressure and temperature reducing, vapour technic index is used for ensureing to concentrate, want continuous controlling opening of valve to meet and concentrated use vapour index, cause valve decline in work-ing life, and frequent operation, require higher to operator, steam is easily with water.After modification, after setting up generating set, turbine rotor tachyphylaxis is very fast, and steam turbine drops to 2600 revs/min by specified speed 3000 revs/min, causes concentrated steam consumption slight fluctuations.This is because reduce the energy being converted into electric energy.Exhaust steam pressure is 0.18MPa, stabilizes the low-pressure steam pressure into graphite heat exchanger, stabilizes concentrated production.Often overlap Phosphoric Acid Concentration long-term operation and reach 30 days.
Embodiment 4
Modification scheme is with embodiment 1.When the fluctuation of outer tube vapor temperature is comparatively up to 240 DEG C, before transformation, desuperheat mode is undertaken by spray de-salted water pressure and temperature reducing, vapour technic index is used for ensureing to concentrate, want continuous controlling opening of valve to meet and concentrated use vapour index, cause valve decline in work-ing life, and frequent operation, require higher to operator, steam is easily with water.After modification, the by-pass of adjustment generating set controls, and by-pass valve opening reduces to 4% by 8%, unnecessary thermal energy is allowed to be electric energy, stabilize the low-pressure steam temperature into graphite heat exchanger, the low-pressure steam temperature entering graphite heat exchanger, at 133 DEG C, stabilizes concentrated production.Often overlap Phosphoric Acid Concentration long-term operation and reach 30 days.
Embodiment 5
Modification scheme is with embodiment 1.When the fluctuation of outer tube vapor temperature is lower, reach 200 DEG C, before transformation, steady temperature mode is undertaken by spray de-salted water pressure and temperature reducing, for ensureing concentratedly use vapour technic index, continuous controlling opening of valve to meet to concentrate to use vapour index, valve is caused to decline work-ing life, and frequent operation, require higher to operator, steam is easily with water.After modification, the by-pass of adjustment generating set controls, and by-pass valve opening is added to 9% by 4%, decrease the ability being converted into electric energy, stabilize the low-pressure steam temperature into graphite heat exchanger, the low-pressure steam temperature entering graphite heat exchanger, at 127 DEG C, stabilizes concentrated production.Often overlap Phosphoric Acid Concentration long-term operation and reach 30 days.
Embodiment 6
Modification scheme is with embodiment 1.When outer tube vapor pressure, temperature fluctuate higher simultaneously, pressure reaches 0.9MPa, temperature reaches 240 DEG C, before transformation, decompression, desuperheat mode are undertaken by spray de-salted water pressure and temperature reducing, for ensureing concentratedly use vapour technic index, continuous controlling opening of valve to meet to concentrate to use vapour index, valve is caused to decline work-ing life, and frequent operation, require higher to operator, steam is easily with water.After modification, by setting up generating set, turbine rotor tachyphylaxis is very fast, and steam turbine rises to 4100 revs/min by specified speed 3000 revs/min, causes concentrated steam consumption slight fluctuations.This is because unnecessary ability is converted into electric energy.Exhaust steam pressure is 0.21MPa, stabilizes the low-pressure steam pressure into graphite heat exchanger, stabilizes concentrated production.After modification, preferentially adjust vapor pressure, then adjust vapor temperature.Stabilize the low-pressure steam temperature into graphite heat exchanger, the low-pressure steam temperature entering graphite heat exchanger, at 130 DEG C, stabilizes concentrated production.Often overlap Phosphoric Acid Concentration long-term operation and reach 30 days.
Embodiment 7
Modification scheme is with embodiment 1.When outer tube vapor pressure, temperature fluctuate lower simultaneously, pressure reaches 0.7MPa, temperature reaches 205 DEG C, before transformation, decompression, desuperheat mode are undertaken by spray de-salted water pressure and temperature reducing, for ensureing concentratedly use vapour technic index, continuous controlling opening of valve to meet to concentrate to use vapour index, valve is caused to decline work-ing life, and frequent operation, require higher to operator, steam is easily with water.After modification, by setting up generating set, turbine rotor tachyphylaxis is very fast, and steam turbine rises to 2500 revs/min by specified speed 3000 revs/min, causes concentrated steam consumption slight fluctuations.This is because unnecessary ability is converted into electric energy.Exhaust steam pressure is 0.22MPa, stabilizes the low-pressure steam pressure into graphite heat exchanger, stabilizes concentrated production.After modification, preferentially adjust vapor pressure, then adjust vapor temperature.Stabilize the low-pressure steam temperature into graphite heat exchanger, the low-pressure steam temperature entering graphite heat exchanger, at 135 DEG C, stabilizes concentrated production.Often overlap Phosphoric Acid Concentration long-term operation and reach 30 days.
Claims (1)
1. the steam used for Phosphoric Acid Concentration system carries out the method for pressure and temperature reducing, it is characterized in that: at the admission end of graphite heat exchanger, a cogeneration steam turbine is set, the low-pressure steam of outer tube is connected via the admission end of admission valve with cogeneration steam turbine, and the steam after pressure and temperature reducing is connected with the admission end of graphite heat exchanger via vapor cock; Described cogeneration steam turbine drags 1 1000kw asynchronous generator by 1 cover 1000KW hot merit Steam Turbine and forms, and the electricity that asynchronous generator sends outputs to graphite heat exchanger for propeller pump.
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| CN201410249748.5A CN104045069B (en) | 2014-06-06 | 2014-06-06 | A kind of steam used for Phosphoric Acid Concentration system carries out the method for pressure and temperature reducing |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774558A (en) * | 2009-12-25 | 2010-07-14 | 中国海洋石油总公司 | Method for improving yield of concentrated phosphoric acid |
| CN103523763A (en) * | 2013-10-11 | 2014-01-22 | 徐州天正活性炭厂 | Energy saving apparatus and method for rapid concentration of dilute phosphoric acid |
| CN203545683U (en) * | 2013-10-11 | 2014-04-16 | 徐州天正活性炭厂 | Energy-saving device for rapidly concentrating diluted phosphoric acid |
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- 2014-06-06 CN CN201410249748.5A patent/CN104045069B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774558A (en) * | 2009-12-25 | 2010-07-14 | 中国海洋石油总公司 | Method for improving yield of concentrated phosphoric acid |
| CN103523763A (en) * | 2013-10-11 | 2014-01-22 | 徐州天正活性炭厂 | Energy saving apparatus and method for rapid concentration of dilute phosphoric acid |
| CN203545683U (en) * | 2013-10-11 | 2014-04-16 | 徐州天正活性炭厂 | Energy-saving device for rapidly concentrating diluted phosphoric acid |
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Effective date of registration: 20200827 Address after: 650228 No. 1417, Dianchi Road, Xishan District, Yunnan, Kunming Patentee after: YUNNAN YUNTIANHUA Co.,Ltd. Address before: 650228 No. 1417, Dianchi Road, Kunming, Yunnan Patentee before: YUNNAN YUNTIANHUA INTERNATIONAL CHEMICAL Co.,Ltd. |
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Effective date of registration: 20220221 Address after: 655000 Yunfeng company, Banqiao street, Xuanwei City, Qujing City, Yunnan Province Patentee after: Yunnan Yuntianhua Yunfeng Chemical Co.,Ltd. Address before: 650228 No. 1417, Dianchi Road, Xishan District, Yunnan, Kunming Patentee before: YUNNAN YUNTIANHUA Co.,Ltd. |