CN204827878U - Large -scale thermal power unit vacuum keeps system - Google Patents
Large -scale thermal power unit vacuum keeps system Download PDFInfo
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- CN204827878U CN204827878U CN201520433961.1U CN201520433961U CN204827878U CN 204827878 U CN204827878 U CN 204827878U CN 201520433961 U CN201520433961 U CN 201520433961U CN 204827878 U CN204827878 U CN 204827878U
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Abstract
The utility model discloses a large -scale thermal power unit vacuum keeps system belongs to thermal power control field. A large -scale thermal power unit vacuum keeps system includes that two evacuation unit lines and two vacuum maintain the unit line, evacuation unit line and vacuum maintain unit line parallel connection of each other, condenser (11) export maintain the unit line connection through air inlet pipeline (1) and the evacuation unit line unit line and the vacuum of connecting in parallel mutually, the vacuum keep the unit solenoid and draw together admit air manual valve (2), admit air quick -break solenoid valve (3), roots's water ring formula vacuum unit (4), the pipeline of giving vent to anger (5) and air outlet valve (6) that connect gradually. It has ultra -supercritical generating unit vacuum system low energy consumption, advantage that vacuum is high.
Description
Technical field
The utility model relates to thermal power generation control field, more particularly, relates to a kind of large-scale thermal power machine group vacuum keeping system.
Background technique
Thermal power plant generally need apply the vaccum-pumping equipment such as water jet air ejector or Nash hytor aborning and set up vacuum at the unit starting initial stage, and maintains vacuum in normal operation.But the efficiency of these vaccum-pumping equipments is lower, generally only has about 30%, therefore, its power consumption is higher; On the other hand, the rising of the restricted working water temperature of pumping performance of these vaccum-pumping equipments, special in higher water temperature in summer, its pumping performance is off-design value far away, causes the vacuum of vapour condenser to decline further, reduce the Economy of unit, add gross coal consumption rate, meanwhile, because gasification problem causes Nash hytor inside to be cavitated, cause device damage, even have an accident.
At present, the vaccum-pumping equipment type selecting of domestic overcritical thermal power generation unit is all generally arrange 3 cover 50% capacity ordinary water ring vacuum pumps in Steam Side of Condenser pumped vacuum systems.During normal operation, a set of vacuum pump is as subsequent use.When unit starting, all vacuum pumps can put into operation together, can set up required degree of vacuum quickly like this, thus shorten the unit starting time.
Chinese patent application, application number 201310006450.7, publication date on April 17th, 2013, disclose the devices and methods therefor maintaining thermal power plant condenser vacuum, the invention discloses a kind of devices and methods therefor with energy-efficient maintenance thermal power plant condenser vacuum, comprising: air inlet pneumatic valve, preposition condenser, Roots pump, rear condenser, check valve, water ring vaccum pump, moisture trap; At inlet end, one pneumatic valve is set, in this pneumatic valve rear end, one condenser is set, end arranges Roots pump after the condenser, compress for bleeding, arrange the second condenser again in Roots pump rear end, after the second condenser, arrange safety check, its effect is when this equipment failure is stopped transport, after check valve, connect a Nash hytor, be connected at moisture trap and Nash hytor.The present invention can substitute conventional highly energy-consuming vaccum-pumping equipment under thermal power plant's generator set accidental conditions, there is energy-efficient effect (fractional energy savings reaches 50 ~ 90%), simultaneously because it is subject to the impact of temperature and water temperature hardly, compared with conventional vaccum-pumping equipment, the vacuum of vapour condenser can be improved, thus play a part to reduce gross coal consumption rate.But this programme is simple vacuum system, be not the maintenance scheme of system, and a Roots pump degree of vacuum is lower, vacuum effectiveness is bad, and fragile.
Summary of the invention
1. the technical problem that will solve
For the problem of the supercritical generating sets vacuum system high energy consumption existed in prior art, low vacuum, the utility model provides a kind of large-scale thermal power machine group vacuum keeping system, and it has the low energy consumption of supercritical generating sets vacuum system, advantage that degree of vacuum is high.
2. technological scheme
The purpose of this utility model is achieved through the following technical solutions.
A kind of large-scale thermal power machine group vacuum keeping system, article two, vacuumize unit line and two vacuum maintenance unit lines, described unit line and the vacuum of vacuumizing maintains unit line and is connected in parallel mutually, and described vapour condenser outlet is maintained unit line be connected by vacuumize unit line unit line and the vacuum of air inlet pipeline and parallel connection mutually;
The wherein said unit line that vacuumizes comprises the air inlet manually operated valve connected successively, a butterfly valve, No. two butterfly valves, vacuum pump, steam-water separator and gas outlet valves, and wherein said air inlet manually operated valve one end is connected to vapour condenser outlet; Described steam-water separator is connected with outside by gas outlet valve;
Described vacuum maintains unit line and comprises the air inlet manually operated valve, air inlet quick-break solenoid valve, air-cooled Roots's water ring vaccum pump group, outlet pipe and the gas outlet valve that connect successively.
Further, the described unit line that vacuumizes also comprises vacuum pump, No. three butterfly valves and three-way valve, the air inlet end of described vacuum pump is connected with No. three butterfly valves, three-way valve and steam-water separators successively, the air outlet slit end of vacuum pump is connected with vacuum pump one end, and vacuum pump medium inlet end is connected between a butterfly valve and No. two butterfly valves.Vacuum pump is as fore pumping device, the aspiration vacuum level of vacuum pump group can be improved, prevent because vacuum pump sealing coolant-temperature gage raises and restrict the generation that underrun stage condenser vacuum improves situation, and the swabbing pressure in Nash hytor can be made greatly to improve, alleviate the damage of the blade caused because of cavitation erosion in pump, reduce the running noises of vacuum pump, contribute to increasing the service life, and when the blank tolerance of vacuum system is little, vacuum pump installing vacuum pump additional effect of bleeding is identical with the vacuum pump effect that two do not add vacuum pump, economize on pump, power consumption reduces.
Further, described vacuum pump is Nash hytor.
Further, described vacuum pump capacity is 50% of overall vacuum amount.The vacuum pump that effectively can carry out different capabilities for different capacity requirements is replaced.
Further, described air-cooled Roots's water ring type vacuum pump set is that Nash hytor and air-cooled Roots pump are composed in series, and Nash hytor is fore pump.Nash hytor as fore pump than other vacuum pump advantageously, which overcome ultimate pressure difference (ultimate pressure of unit improves a lot than Nash hytor) when separate unit Nash hytor uses, the shortcoming that the speed of exhaust is low under a certain pressure, remain Roots pump can work rapidly simultaneously, have the advantage of the larger speed of exhaust.
Further, described Roots's water ring type vacuum pump set also comprises gas ballasting oil-sealed rotary pump, described gas ballasting oil-sealed rotary pump and Nash hytor are connected in parallel, and the gas ballasting oil-sealed rotary pump be connected in parallel is connected with Roots pump with Nash hytor, as the fore pump of Roots pump.Make under a large amount of water vapor, ultimate vacuum is high.
Further, described Nash hytor is twin-stage Nash hytor.The ultimate vacuum of unit can be improved.
3. beneficial effect
Compared to prior art, the utility model has the advantage of:
(1), employ vacuum pump, thoroughly solve the problem of cavitation of ordinary water ring vacuum pumps, avoid Nash hytor to work under cavitation situation, reduce the possibility of impeller failure;
(2), employ vacuum pump, reduce the pollution problem of water ring vaccum pump strong noise, meet environmental requirement;
(3), employ vacuum maintenance unit line, solve the problem of water ring vaccum pump highly energy-consuming, save cooling water inflow, only 7 ~ 10 tons/hour, this programme use water;
(4), directly can transform existing equipment, after transformation, former vacuum pump is for subsequent use for a long time, thus realizes maintenance-free, reduces workload and expense;
(5), by the method for operation switch and realize energy-saving and cost-reducing, efficient vacuum pump power consumption and greatly decline, service behaviour is by the restriction that working water temperature raises, and fractional energy savings reaches high to more than 80%;
(6), Nash hytor is twin-stage Nash hytor, and improve the ultimate vacuum of unit, pumping performance is good;
(7), high-efficiency appliance substitutes inefficient equipment, minimizing maintenance workload and cost;
Accompanying drawing explanation
Fig. 1: be conventional power generation usage unit vacuum system structural representation;
Fig. 2: be the real design proposal structural representation of the utility model.
Number in the figure illustrates:
In figure: 1, air inlet pipeline; 2, air inlet manually operated valve; 3, air inlet quick-break solenoid valve; 4, Roots's water ring type vacuum pump set; 5, outlet pipe; 6, gas outlet valve; 7, a butterfly valve; 8, No. two butterfly valves; 9, No. three butterfly valves; 10, three-way valve; 11, vapour condenser; 12, vacuum pump; 13, vacuum pump; 14, steam-water separator.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the utility model is described in detail.
Embodiment 1
The purpose of this utility model solves current supercritical generating sets vacuum system high energy consumption, the utility model content is except being increase by two cover high efficiency low energy consumption air-cooled Roots's water ring type vacuum pump set on original vacuum system basis, the performance of this unit is better than the performance of air-water ring vaccum pump group, current thermal power plant can be substituted with air-cooled Roots's water ring type vacuum pump set 4 and widely use inefficient vaccum-pumping equipment, effectively can save the energy.
As shown in Figure 1, the vaccum-pumping equipment type selecting of existing overcritical thermal power generation unit is all generally arrange in vapour condenser 11 side pumped vacuum systems that 3 cover 50% capacity are common vacuumizes unit line.During normal operation, two covers run, and a set of unit line that vacuumizes is as subsequent use.Vacuumize unit line and comprise air inlet manually operated valve 2, butterfly valve 7, No. two butterfly valves 8, vacuum pump 12, steam-water separator 14 and gas outlet valves 6 of connecting successively, wherein said air inlet manually operated valve 2 one end is connected to vapour condenser 11 and exports; Described steam-water separator 14 is connected with outside by gas outlet valve 6; On basis, some equipment also comprises vacuum pump 13, No. three butterfly valves 9 and three-way valve 10, the air inlet end of described vacuum pump 13 is connected with No. three butterfly valves 9, three-way valve 10 and steam-water separator 14 successively, one end of three-way valve 10 can be connected with outside air valve, the air outlet slit end of vacuum pump 13 is connected with vacuum pump 12 one end, and vacuum pump 13 medium inlet end is connected between a butterfly valve 7 and No. two butterfly valves 8.
There are the following problems in this vacuum system configuration:
(1) vacuum pump design unreasonable, by set up vacuum, maintain vacuum lump together;
(2) operation energy consumption is higher, efficiency low (about 30%)---highly energy-consuming;
(3) vacuum pump problem of cavitation can not be solved, work under cavitation for a long time---noise large (more than 100 decibel), rotor failure;
(4) cannot meet vacuum at high temperature season to maintain, cause the vacuum of some unit to reduce, add gross coal consumption rate, reduce unit economy, pumping performance is limited by the temperature variation of working solution (water)---and suction performance declines.
The technical program is in vapour condenser 11 side, what arrange 2 cover 50% capacity vacuumizes unit line and 2 cover vacuum maintenance unit lines, unit line pulling vacuum is vacuumized with 2 cover 50% capacity during unit starting, unit operation is normal, start 2 cover vacuum and maintain unit line, 2 cover 50% capacity of stopping using vacuumize unit line and do emergency duty.
Concrete setting as shown in Figure 2, comprise two and vacuumize unit line and two vacuum maintenance unit lines, vacuumize unit line and the vacuum that amount to four maintain unit line and are connected in parallel mutually, and described vapour condenser 11 exports and maintained unit line be connected by vacuumize unit line unit line and the vacuum of air inlet pipeline 1 and parallel connection mutually;
The wherein said unit line that vacuumizes comprises air inlet manually operated valve 2, butterfly valve 7, No. two butterfly valves 8, vacuum pump 12, steam-water separator 14 and gas outlet valves 6 of connecting successively, and vacuum pump 12 is Nash hytor, and capacity is 50% of overall vacuum amount.Wherein said air inlet manually operated valve 2 one end is connected to vapour condenser 11 and exports; Described steam-water separator 14 is connected with outside by gas outlet valve 6; Vacuumize unit line and also comprise vacuum pump 13, No. three butterfly valves 9 and three-way valve 10, the air inlet end of described vacuum pump 13 is connected with No. three butterfly valves 9, three-way valve 10 and steam-water separator 14 successively, the air outlet slit end of vacuum pump 13 is connected with vacuum pump 12 one end, and vacuum pump 13 medium inlet end is connected between a butterfly valve 7 and No. two butterfly valves 8.Vacuum pump 13 is as fore pumping device, the aspiration vacuum level of vacuum pump group can be improved, prevent because vacuum pump sealing coolant-temperature gage raises and restrict the generation that underrun stage condenser vacuum improves situation, and the swabbing pressure in Nash hytor can be made greatly to improve, alleviate the damage of the blade caused because of cavitation erosion in pump, reduce the running noises of vacuum pump, contribute to increasing the service life, and when the blank tolerance of vacuum system is little, water ring vaccum pump installing vacuum pump 13 additional effect of bleeding is identical with the water ring vaccum pump effect that two do not add vacuum pump 13, economize on pump, power consumption reduces.
Described vacuum maintains unit line and comprises the air inlet manually operated valve 2, air inlet quick-break solenoid valve 3, Roots's water ring type vacuum pump set 4, outlet pipe 5 and the gas outlet valve 6 that connect successively.Described Roots's water ring type vacuum pump set 4 is composed in series for Nash hytor and Roots pump, and Nash hytor is fore pump.Nash hytor as fore pump than other vacuum pump advantageously, which overcome ultimate pressure difference (ultimate pressure of unit improves a lot than Nash hytor) when separate unit Nash hytor uses, the shortcoming that the speed of exhaust is low under a certain pressure, remain Roots pump can work rapidly simultaneously, have the advantage of the larger speed of exhaust.
Especially can adapt to extract a large amount of coercibility steam, particularly when gas ballasting oil-sealed rotary pump, to get rid of coercibility steam ability inadequate, or the solvent used can make pump oil worsen and affect performance, or more obvious time vacuum system does not allow oil pollution.Under also observing corresponding safety regulations when being furnished with anti-explosion motor and electrical equipment, also can extract inflammable and explosive gas.Ordinary circumstance, single-stage water-ring vacuum pump ultimate vacuum is not high, and the forevacuum that the Roots pump that China produces at present requires is higher, therefore in fact without the fore pump of single-stage water-ring vacuum pump as Roots pump, and use as fore pump with the twin-stage Nash hytor that can improve ultimate vacuum, the Nash hytor adopted is twin-stage Nash hytor, can also improve the ultimate vacuum of unit.
The ultimate vacuum of an air-cooled Roots pump is lower, particularly when it and Nash hytor combined running, using scope is restricted, the ultimate vacuum of whole unit may be lower, if but combine with Nash hytor again with two Roots pump series connection, just greatly can improve the ultimate vacuum of unit.This unit is mainly used in needing to process a large amount of water vapor, and ultimate vacuum requires higher pumped vacuum systems, such as, in vacuum drying.
Require process a large amount of water vapor vacuum system in, use Nash hytor be more suitable, but due to its ultimate vacuum not high, cause the ultimate vacuum of whole unit lower.Although in the pumped vacuum systems requiring degree of vacuum higher, the oil-sealed rotary pump needing limiting vacuum higher uses as fore pump.But because the power consumption of Nash hytor is large, efficiency is very low, and noise is high, in the long vacuum drying system of needs, very uneconomical as Roots pump fore pump with Nash hytor.In these cases, can by parallel with Nash hytor for gas ballasting oil-sealed rotary pump, as the fore pump of Roots pump.Described Roots's water ring type vacuum pump set 4 also comprises gas ballasting oil-sealed rotary pump, described gas ballasting oil-sealed rotary pump and Nash hytor are connected in parallel, the gas ballasting oil-sealed rotary pump be connected in parallel is connected with Roots pump with Nash hytor, as the fore pump of Roots pump.During vacuum drying, first take out in advance with Nash hytor, until when water vapor reduces in a large number, then start gas ballasting oil-sealed rotary pump, cut off Nash hytor.As needed the long period just can complete dry occasion, required cooling water and power are all less.
The vacuum pump group of native system aspirates condensation step by step by two-stage system, and by front level suction with after being cooled, most of water vapor condensation, reduces rear class pump load, substitute conventional powerful vacuum pump, thus reach object energy-conservation further.
The utility model design concept is used to new-built unit, will its better effects if.
Below be schematically described the invention and mode of execution thereof, this description does not have restricted, when not deviating from spirit of the present invention or essential characteristic, can realize the present invention in other specific forms.One of mode of execution of the also just the invention shown in accompanying drawing, actual structure is not limited thereto, and any reference character in claim should not limit involved claim.So, if those of ordinary skill in the art enlightens by it, when not departing from this creation aim, designing the mode of structure similar to this technological scheme and embodiment without creationary, the protection domain of this patent all should be belonged to.In addition, " comprising " one word do not get rid of other elements or step, " one " word before element is not got rid of and is comprised " multiple " this element.
Claims (7)
1. a large-scale thermal power machine group vacuum keeping system, it is characterized in that: comprise two and vacuumize unit line and two vacuum maintenance unit lines, described unit line and the vacuum of vacuumizing maintains unit line and is connected in parallel mutually, and vapour condenser (11) outlet is maintained unit line be connected by vacuumize unit line and the vacuum of air inlet pipeline (1) and parallel connection mutually;
The wherein said unit line that vacuumizes comprises the air inlet manually operated valve (2) connected successively, a butterfly valve (7), No. two butterfly valves (8), vacuum pump (12), steam-water separator (14) and gas outlet valves (6), and wherein said air inlet manually operated valve (2) one end is connected to vapour condenser (11) outlet; Described steam-water separator (14) is connected with outside by gas outlet valve (6);
Described vacuum maintains unit line and comprises the air inlet manually operated valve (2), air inlet quick-break solenoid valve (3), Roots's water ring type vacuum pump set (4), outlet pipe (5) and the gas outlet valve (6) that connect successively.
2. a kind of large-scale thermal power machine group vacuum keeping system according to claim 1, it is characterized in that: the described unit line that vacuumizes also comprises vacuum pump (13), No. three butterfly valves (9) and three-way valve (10), the air inlet end of described vacuum pump (13) successively with No. three butterfly valves (9), three-way valve (10) is connected with steam-water separator (14), the air outlet slit end of vacuum pump (13) is connected with vacuum pump (12) one end, vacuum pump (13) medium inlet end is connected between a butterfly valve (7) and No. two butterfly valves (8).
3. a kind of large-scale thermal power machine group vacuum keeping system according to claim 1 and 2, is characterized in that: described vacuum pump (12) is Nash hytor.
4. a kind of large-scale thermal power machine group vacuum keeping system according to claim 3, is characterized in that: described vacuum pump (12) capacity is 50% of overall vacuum amount.
5. a kind of large-scale thermal power machine group vacuum keeping system according to claim 1 and 2, is characterized in that: described Roots's water ring type vacuum pump set (4) is composed in series for Nash hytor and Roots pump, and Nash hytor is fore pump.
6. a kind of large-scale thermal power machine group vacuum keeping system according to claim 5, it is characterized in that: described Roots's water ring type vacuum pump set (4) also comprises gas ballasting oil-sealed rotary pump, described gas ballasting oil-sealed rotary pump and Nash hytor are connected in parallel, the gas ballasting oil-sealed rotary pump be connected in parallel is connected with Roots pump with Nash hytor, as the fore pump of Roots pump.
7. a kind of large-scale thermal power machine group vacuum keeping system according to claim 6, is characterized in that: described Nash hytor is twin-stage Nash hytor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105865219A (en) * | 2016-04-19 | 2016-08-17 | 刘子旺 | Multi-stage hot-pressing type vacuum pumping system |
| CN106014997A (en) * | 2016-07-12 | 2016-10-12 | 上海伊莱茨真空技术有限公司 | Three-level-roots-water ring intelligent frequency converting control vacuum system and control method thereof |
| CN106949753A (en) * | 2017-04-01 | 2017-07-14 | 祝凤娟 | A kind of control method of the changeable vacuum system of Air-cooled Unit full working scope |
| CN113833630A (en) * | 2021-09-29 | 2021-12-24 | 潮州深能环保有限公司 | Pipeline system of vacuum pump unit of waste incineration power plant |
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2015
- 2015-06-23 CN CN201520433961.1U patent/CN204827878U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865219A (en) * | 2016-04-19 | 2016-08-17 | 刘子旺 | Multi-stage hot-pressing type vacuum pumping system |
| CN105865219B (en) * | 2016-04-19 | 2017-03-01 | 山西爱晟特环保科技有限公司 | Multistage heat pressing type pumped vacuum systems |
| CN106014997A (en) * | 2016-07-12 | 2016-10-12 | 上海伊莱茨真空技术有限公司 | Three-level-roots-water ring intelligent frequency converting control vacuum system and control method thereof |
| CN106014997B (en) * | 2016-07-12 | 2018-07-13 | 上海伊莱茨真空技术有限公司 | A kind of three-level Roots-water ring intelligent frequency-conversion control vacuum system and its control method |
| CN106949753A (en) * | 2017-04-01 | 2017-07-14 | 祝凤娟 | A kind of control method of the changeable vacuum system of Air-cooled Unit full working scope |
| CN106949753B (en) * | 2017-04-01 | 2017-12-08 | 晟源高科(北京)科技有限公司 | A kind of control method of the changeable vacuum system of Air-cooled Unit full working scope |
| CN113833630A (en) * | 2021-09-29 | 2021-12-24 | 潮州深能环保有限公司 | Pipeline system of vacuum pump unit of waste incineration power plant |
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