CN212340001U - Multistage coupling condenser vacuum pumping system of coal-fired power plant - Google Patents
Multistage coupling condenser vacuum pumping system of coal-fired power plant Download PDFInfo
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- CN212340001U CN212340001U CN202020724124.5U CN202020724124U CN212340001U CN 212340001 U CN212340001 U CN 212340001U CN 202020724124 U CN202020724124 U CN 202020724124U CN 212340001 U CN212340001 U CN 212340001U
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Abstract
The utility model discloses a coal fired power plant multistage coupling condenser evacuation system, it includes condenser (1), two single-stage plain disc vacuum pump package (2) that 50% were exerted oneself, two 25% bipolar centrum vacuum pump package (3), vacuum stop valve (4) and pneumatic stop valve (5) of exerting oneself. When the condenser is vacuumized, all two single-stage plain disc type vacuum pump sets (2) are started, and the vacuum is rapidly built. And when the vacuum of the condenser reaches a design value, only 1 bipolar vertebral body vacuum pump set (3) is started to maintain vacuum with low power consumption. The utility model overcomes the defects that when the unit of the coal-fired power plant is started in the prior art, the condenser needs to rely on the vacuum pump to quickly establish vacuum; after the designed vacuum is achieved, the condenser has the defect that only a small number of interfaces have air leakage, and has the advantages of adopting a single-stage pump to establish vacuum and adopting a two-stage cone pump to maintain the vacuum operation principle and fully utilizing the performance of different pump types in different intervals.
Description
Technical Field
The utility model relates to energy, chemical industry technical field, more specifically are a coal fired power plant multistage coupling condenser evacuation system.
Background
When a unit of the coal-fired power plant is started, the condenser needs to rely on a vacuum pump to quickly establish vacuum. When the vacuum pump establishes vacuum, the pressure in the condenser is gradually reduced from the atmospheric pressure of 101.3kPa to the design pressure of 5-10 kPa. After the designed vacuum is achieved, only a small number of interfaces in the condenser have the air leakage phenomenon, and at the moment, part of vacuum pumps are required to continue working so as to maintain the vacuum of the condenser.
The vacuum pumps are various, and the coal-fired power plant is mainly provided with a single-stage plain disk vacuum pump and a double-pole cone vacuum pump. The two pumps have advantages in establishing and maintaining the vacuum phase. Fig. 1 and 2 are performance curves of a single-stage pump and a double-stage cone pump of the same grade provided by a certain manufacturer.
As shown in fig. 1 (fig. 1 is a single stage pump)The pumping performance changes along with the inlet pressure), the peak value of the pumping capacity of the single-stage pump can reach 3730m in the working range of 101.3kPa to 5kPa3H, but when the inlet pressure is reduced from 10kPa to 5kPa, the pumping capacity of the single-stage pump is changed from 3620m3The/h rapidly drops to 3190m3The suction capacity is reduced by about 11.8%.
As shown in FIG. 2 (FIG. 2 is the curve of the pumping performance of the dual-stage centrum pump along with the inlet pressure), the ultimate pumping capacity of the dual-stage centrum pump is 3510m3H is less than 3730m of single-stage pump3H, but when the inlet pressure is reduced from 10kPa to 5kPa, the pumping capacity of the single-stage pump is reduced from 3550m3The flow rate/h is reduced to 3380m3The suction capacity is only reduced by about 4.8%.
In summary, a single-stage pump has certain advantages in air pumping speed and air pumping amount, but the air pumping performance of the single-stage pump is obviously reduced in a low vacuum region (inlet pressure is 5-10kPa), and a bipolar cone pump has certain performance advantages.
The coal-fired power plant requires the unit to be started quickly (namely, the vacuum of the condenser is established within 30 minutes), so that the single-stage pump has large air extraction amount, and other pump types with the characteristic of establishing the vacuum quickly are difficult to replace. However, the working efficiency is reduced in a low vacuum interval (the inlet pressure is 5-10kPa), the energy consumption is increased, and even a single-stage pump of part of engineering has cavitation problems in the pressure interval, thereby causing serious safety accidents. Therefore, the vacuum pump simultaneously meets the two requirements of quickly establishing vacuum and maintaining vacuum with low power consumption, and the reasonable design of the vacuum pumping system becomes an urgent priority.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a first aim at overcomes above-mentioned background art's weak point, and provides a coal fired power plant multistage coupling condenser evacuation system.
The first purpose of the utility model is implemented by the following technical scheme: a coal-fired power plant multistage coupling condenser vacuum pumping system comprises a condenser, a single-stage plain disc type vacuum pump set, a bipolar centrum vacuum pump set, a vacuum stop valve and a pneumatic stop valve; the device comprises two single-stage plain disc type vacuum pump sets and two bipolar centrum vacuum pump sets, wherein the single-stage plain disc type vacuum pump sets and the two bipolar centrum vacuum pump sets are arranged in parallel and are connected with a condenser on one side through a main pipe, each single-stage plain disc type vacuum pump set and a branch pipe of each bipolar centrum vacuum pump set are respectively provided with a vacuum stop valve and a pneumatic stop valve, and each air water outlet of the condenser is provided with a vacuum stop valve.
In the above technical scheme: the total output of the two single-stage plain disc vacuum pump sets which are arranged in parallel is 100 percent of the system requirement, and each single-stage plain disc vacuum pump set is 50 percent, and the total output of the two bipolar cone vacuum pump sets is 50 percent of the system requirement, and each double-stage cone vacuum pump set is 25 percent.
The utility model discloses a second aim at provides an evacuation method: a coal-fired power plant multistage coupling condenser vacuumizing method comprises the following steps;
opening a vacuum stop valve arranged at an outlet of a condenser, and a vacuum stop valve and a pneumatic stop valve which are connected with a single-stage plain disc type vacuum pump set in series, and keeping all pipelines smooth.
And secondly, starting the two single-stage plain disc type vacuum pump sets, extracting air from the condenser through a pipeline and starting to establish vacuum.
Thirdly, when the condenser in the second step reaches the required vacuum degree, stopping the whole running single-stage plain disc type vacuum pump set, and closing the vacuum stop valve and the pneumatic stop valve which are connected in series with the single-stage plain disc type vacuum pump set; meanwhile, a vacuum stop valve and a pneumatic stop valve which are connected with the bipolar centrum vacuum pump set in series are opened, and one or two bipolar centrum vacuum pump sets are started according to the requirement; the total air extraction amount of the opened bipolar centrum vacuum pump set is larger than the air leakage amount of the condenser;
and fourthly, keeping the bipolar centrum vacuum pump set in the third step to operate, and enabling the condenser to continuously keep a vacuum state.
In the above technical scheme: when one single-stage plain disc type vacuum pump set is damaged, the two double-stage vertebral body vacuum pump sets can be opened for replacement, so that the continuity and the stability of the vacuum process are ensured.
In the above technical scheme: the number and the capacity of the pump sets configured by the single-stage plain disc type vacuum pump set and the bipolar vertebral body vacuum pump set meet the requirements that the single-stage plain disc type vacuum pump set establishes vacuum and the bipolar vertebral body vacuum pump set can maintain vacuum.
In the above technical scheme: in the step I, the process of vacuumizing the condenser by the single-stage plain disc type vacuum pump set is finished within 30 minutes.
The utility model has the advantages of as follows:
1. the utility model provides a two single-stage plain disc vacuum pump package only use when the unit starts, the condenser establishes the vacuum, and it is big, fast, the high advantage of efficiency of pumping rate, the interval performance of ordinary pressure.
2. Under general conditions, the bipolar centrum vacuum pump set in the utility model is only started when vacuum is maintained, and the advantages of high limit vacuum and high energy efficiency can be exerted when the bipolar centrum vacuum pump set runs in a low-pressure region; emergency, when a single-stage pump breaks down, the utility model provides a two bipolar centrum pumps open simultaneously and can carry out the function to the single-stage pump of damage and replace.
3. The utility model provides a single-stage plain disc vacuum pump package and bipolar centrum vacuum pump package accessible vacuum stop valve and pneumatic stop valve realize independent control, can adjust in good time according to the operational aspect.
4. The utility model discloses utilize two single-stage pumps that 50% were exerted oneself to establish the vacuum, satisfy the condenser and establish vacuum demand fast, maintain the condenser vacuum with 1 bipolar centrum pump that 25% were exerted oneself simultaneously, satisfy the low-power consumption and maintain vacuum tangible demand.
Drawings
FIG. 1 is a graph showing the variation of the pumping performance of a single-stage pump with inlet pressure
FIG. 2 is a curve of the pumping performance of a dual stage pump with inlet pressure provided by a manufacturer
Fig. 3 is the utility model discloses multistage coupling condenser evacuation system schematic diagram.
Fig. 4 is a schematic diagram of a vacuum pumping system of a condenser of a single-stage plain disc vacuum pump.
Fig. 5 is a schematic diagram of a vacuum pumping system of a conventional bipolar cone vacuum pump condenser.
In the figure: the device comprises a condenser 1, a single-stage plain disc type vacuum pump unit 2, a bipolar centrum vacuum pump unit 3, a vacuum stop valve 4, a pneumatic stop valve 5 and a bipolar centrum vacuum pump unit 6.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, but they are not to be construed as limiting the invention, and are presented by way of example only, and the advantages of the invention will be more clearly understood and appreciated by way of illustration.
Referring to FIG. 3: the utility model relates to a coal-fired power plant multistage coupling condenser vacuum pumping system, which comprises a condenser 1, a single-stage plain disc type vacuum pump unit 2, a bipolar centrum vacuum pump unit 3, a vacuum stop valve 4 and a pneumatic stop valve 5; two single-stage plain disc vacuum pump package 2 and two bipolar centrum vacuum pump package 3 between parallel arrangement and be connected with the condenser 1 that one side set up through the female pipe, every single-stage plain disc vacuum pump package 2 and bipolar centrum vacuum pump package 3 the pipeline on all be provided with vacuum stop valve 4 and pneumatic stop valve 5, every air water outlet of condenser 1 all be provided with vacuum stop valve 4.
The total output of the two single-stage plain disc vacuum pump sets 2 which are arranged in parallel is 100 percent of the system requirement, and each single-stage plain disc vacuum pump set is 50 percent, and the total output of the two double-pole cone vacuum pump sets 3 is 50 percent of the system requirement, and each double-pole cone vacuum pump set is 25 percent. The arrangement of the single-stage plain disc type vacuum pump unit 2 and the double-pole centrum type vacuum pump unit 3 can lead the total output of the system to be freely adjusted within the range of 25-150 percent and mutually stand by, thus leading the system to be capable of coping with various working condition changes.
The utility model discloses still include a method to the condenser evacuation: a coal-fired power plant multistage coupling condenser vacuumizing method comprises the following steps;
firstly, a vacuum stop valve 4 arranged at the outlet of the condenser, and a vacuum stop valve 4 and a pneumatic stop valve 5 which are connected with a single-stage plain disc type vacuum pump unit 2 in series are opened, and all pipelines are kept smooth.
And secondly, starting all two single-stage plain disc type vacuum pump sets 2 to extract air from the condenser 1 through pipelines and start to establish vacuum.
And thirdly, stopping operating all the single-stage plain disc type vacuum pump sets 2 after the condenser 1 in the second step reaches the required vacuum degree, and closing the vacuum stop valve 4 and the pneumatic stop valve 5 which are connected in series with the condenser. Meanwhile, a vacuum stop valve 4 and a pneumatic stop valve 5 which are connected with the bipolar centrum vacuum pump unit 3 in series are opened, and 1-two bipolar centrum vacuum pump units 3 are started. The total air pumping quantity of the bipolar centrum vacuum pump set 3 which is started is larger than the air leakage quantity of the condenser 1;
and fourthly, keeping the bipolar centrum vacuum pump unit 3 in the third step to operate, and enabling the condenser 1 to continuously keep a vacuum state.
When 1 single-stage plain disc type vacuum pump unit 2 is damaged, two double-stage vertebral body vacuum pump units 3 can be opened for replacement. Continuity and stability of the vacuum establishing process can be ensured.
The method is not limited to the configuration of two single-stage plain disc type vacuum pump sets 2 and two double-pole cone vacuum pump sets 3, and the number and the capacity of the pump sets can be flexibly configured according to the actual engineering. In the step I, the principle that the single-stage plain disc type vacuum pump set 2 establishes vacuum and the double-pole vertebral body vacuum pump set 3 maintains vacuum is met. This principle can simultaneously ensure that vacuum is established quickly and maintained with low power consumption, thereby greatly reducing the energy consumption of the system.
In the steps I-IV, the process of vacuumizing the condenser 1 by the single-stage plain disc type vacuum pump set 2 needs to be finished within 30 minutes.
Referring to FIG. 4: in the prior art; the condenser vacuum pumping system is additionally provided with 3 single-stage plain disc type vacuum pump sets 2 with 50% output. Namely, two single-stage plain disc vacuum pump units 2 are normally used, and one single-stage plain disc vacuum pump unit 2 is reserved. When the vacuum of the condenser 1 is established, the two pump sets are simultaneously started, and when the vacuum is maintained, one pump set is stopped to reduce the power consumption. The configuration mode of the 2-use 1-device is mature in technology, stable in operation, large in air pumping quantity, capable of quickly establishing vacuum and wide in application.
However, the single-stage plain disc type vacuum pump group 2 has high power consumption and low efficiency under a low-pressure working condition, and 50% of output of a single unit is far greater than that of a condenser for maintaining vacuum. Therefore, the configuration has the advantages of large and high energy consumption, low efficiency and poor economical efficiency during operation, and the vacuum of the condenser is difficult to ensure under the low-pressure working condition, so that the configuration is not beneficial to popularization and use.
Referring to FIG. 5: namely in the prior art; in order to solve the problem of low efficiency under the working condition of low vacuum degree, a part of projects adopt a bipolar centrum vacuum pump unit 6 with 50 percent of output to replace a single-stage plain disc type vacuum pump unit 2. When the vacuum of the condenser 1 is established, two or 3 bipolar cone vacuum pump sets 6 are simultaneously started, and only 1 pump set is operated to reduce power consumption when the vacuum is maintained. Because the bipolar centrum vacuum pump unit 6 has higher air extraction efficiency under the low vacuum working condition, the problem of vacuum degree during operation can be better solved.
However, because the pump set must meet the requirement of establishing condenser vacuum within 30 minutes during model selection, the bipolar centrum vacuum pump set 6 is often large in model, high in power consumption and poor in economical efficiency, and the problems are not completely solved; therefore, is not suitable for popularization and application.
Referring to FIG. 3: the utility model provides a specific embodiment: firstly, when a unit of the coal-fired power plant is started, two single-stage plain disc type vacuum pump sets 2 with 50% output are started simultaneously to quickly establish vacuum of a condenser 1.
After the condenser 1 establishes vacuum, two single-stage plain disc type vacuum pump sets 2 are closed, and simultaneously 1 single-stage and 25% output single-stage and double-stage vertebral body vacuum pump set 3 is opened to maintain the condenser 1 to be in a continuous vacuum state.
The utility model discloses all pump packages all adopt parallel design and realize independent control by vacuum stop valve 4 and pneumatic stop valve 5. When the condenser 1 establishes vacuum, if one single-stage plain disc type vacuum pump set 2 with 50% output fails, two single-stage and double-stage cone type vacuum pump sets 3 with 25% output can be used instead. When the condenser 1 maintains vacuum, if one single-double-pole centrum vacuum pump unit 3 with 25 percent of output fails, the other single-double-pole centrum vacuum pump unit 3 can be used instead.
The bipolar centrum vacuum pump group 3 can be provided with the bipolar centrum vacuum pump group 3 of the frequency conversion device according to the working condition requirement so as to further reduce the operation power consumption. The utility model provides a single-stage plain disc vacuum pump package 2 and bipolar centrum vacuum pump package 3 can replace into its vacuum pump form when necessary, only wherein the large capacity pump body establish rapidly vacuum, the small capacity pump body maintain condenser 1's the vacuum operation principle can.
Example 2: taking a 600 MW-level unit of a certain power plant in China as an example, the utility model is compared and calculated with the investment and operation cost of a conventional system.
The designed dry gas extraction amount of the power plant condenser is 61.23kg/h, the annual utilization hours are 7000h, the price of coal is 1400 yuan/ton, and the heat consumption of a unit is 7977 kJ/kWh.
The first scheme is as follows: conventionally, 3 50% capacity single stage pumps were configured (2 with 1, as shown in fig. 4), scheme two: 3 bipolar cone vacuum pump sets with 50% capacity (2 is prepared with 1, as shown in fig. 3) are configured, and the third scheme is as follows: referring to the utility model, two 50% output single-stage plain disc vacuum pump sets 2+ two 25% output bipolar centrum vacuum pump sets 3 are provided (as shown in figure 1).
The calculation method is as follows:
1) annual fixed fee
The cost of the system is accounted for by annual fee usage:
AC＝P(FCR)
in the formula:
AC: annual fixed cost n: the economic operation year is 15 years
P: total investment of the system, 90-135 ten thousand yuan i: the standard yield is 8 percent
FCR: fixed rate of annual charge
2) Annual operating cost
The running cost is calculated as follows:
OM1＝(PhHR/ηSC)Pc
P＝UI
in the formula:
OM1: annual operating cost η: boiler efficiency, 0.943
P: actual power consumption HR: heat consumption of the units, 7977kJ/kWh
h: annual hours of use, 7000Pc: standard coal price, 1400 yuan/ton
U: rated voltage, 380V Sc: standard coal calorific value, 29301kJ/kg
I: operating Current, 90-230A
3) Annual overhaul and maintenance costs
The annual overhaul and maintenance cost is equal to the initial investment cost multiplied by 2.5 percent
4) Annual cost
Annual fee is the annual fixed fee + annual operation fee + annual maintenance fee
| Unit of | Scheme one | Scheme two | Scheme three | |
| Initial investment | Wan Yuan | 90 | 135 | 90 |
| Benchmark rate of return | ％ | 0.08 | 0.08 | 0.08 |
| Economic operating life | Year of |
15 | 15 | 15 |
| Fixed rate of annual charge | \ | 0.117 | 0.117 | 0.117 |
| Annual fixed fee | Wan Yuan | 10.51 | 15.77 | 10.51 |
| Operating current | A | 230 | 170 | 90 |
| Annual utilization hours | h | 7000 | 7000 | 7000 |
| Heat loss of machine set | kJ/kWh | 7977 | 7977 | 7977 |
| Price of coal | Yuan/ton | 1400 | 1400 | 1400 |
| Standard coal calorific value | kJ/kg | 29301 | 29301 | 29301 |
| Operating costs | Wan Yuan | 24.73 | 18.28 | 9.68 |
| Cost of overhaul and maintenance | Wan Yuan | 2.25 | 3.375 | 2.25 |
| Annual cost | Wan Yuan | 37.49 | 31.14 | 24.76 |
| Difference of annual cost | Wan Yuan | Datum | -6.345 | -12.728 |
The above calculation results show that the utility model discloses a multistage coupling condenser evacuation system (scheme three) its working costs is the least under the same boundary condition, and annual cost is the lowest.
The above-mentioned parts not described in detail are prior art.
Claims (2)
1. The utility model provides a coal fired power plant multistage coupling condenser evacuation system which characterized in that: the device comprises a condenser (1), a single-stage plain disc type vacuum pump set (2), a bipolar cone vacuum pump set (3), a vacuum stop valve (4) and a pneumatic stop valve (5); two single-stage plain disc vacuum pump group (2) and two bipolar centrum vacuum pump group (3) between parallel arrangement and be connected with condenser (1) of one side through the female pipe, every single-stage plain disc vacuum pump group (2) and the branch pipe of bipolar centrum vacuum pump group (3) on all be provided with vacuum stop valve (4) and pneumatic stop valve (5), every gas water export of condenser (1) all is provided with vacuum stop valve (4).
2. The coal-fired power plant multistage coupling condenser vacuum pumping system of claim 1, characterized in that: the total output of the two single-stage plain disc type vacuum pump sets (2) which are arranged in parallel is 100 percent of the system requirement, each is 50 percent, and the total output of the two double-stage cone type vacuum pump sets (3) is 50 percent of the system requirement, each is 25 percent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020724124.5U CN212340001U (en) | 2020-05-06 | 2020-05-06 | Multistage coupling condenser vacuum pumping system of coal-fired power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020724124.5U CN212340001U (en) | 2020-05-06 | 2020-05-06 | Multistage coupling condenser vacuum pumping system of coal-fired power plant |
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| CN212340001U true CN212340001U (en) | 2021-01-12 |
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| CN202020724124.5U Active CN212340001U (en) | 2020-05-06 | 2020-05-06 | Multistage coupling condenser vacuum pumping system of coal-fired power plant |
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