CN219910887U - Steam turbine low pressure cylinder admission adjusting and cooling system - Google Patents
Steam turbine low pressure cylinder admission adjusting and cooling system Download PDFInfo
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- CN219910887U CN219910887U CN202320230396.3U CN202320230396U CN219910887U CN 219910887 U CN219910887 U CN 219910887U CN 202320230396 U CN202320230396 U CN 202320230396U CN 219910887 U CN219910887 U CN 219910887U
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- 229910052799 carbon Inorganic materials 0.000 description 4
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- 238000006386 neutralization reaction Methods 0.000 description 1
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Abstract
The utility model discloses a steam turbine low pressure cylinder steam inlet regulating and cooling system, which comprises a steam turbine medium and low pressure communicating pipe, a communicating pipe isolating valve, a low pressure cylinder steam inlet bypass, a steam inlet bypass isolating valve, a steam inlet bypass regulating valve and a temperature reducing device. The two ends of the medium-low pressure communicating pipe are connected with a medium-pressure cylinder steam exhaust pipeline and a low-pressure cylinder steam inlet pipeline, and the low-pressure cylinder steam inlet bypass is connected with the medium-low pressure communicating pipe in parallel. The temperature reducing water device is also provided with a temperature reducing water pipe, a temperature reducing water regulating valve and a temperature reducing water isolating valve. The utility model can realize the accurate adjustment and control of the steam inlet parameters of the low-pressure cylinder of the steam turbine, thereby avoiding the problem of air blast overtemperature which is easy to occur when the low-pressure cylinder is used for micro-admission, ensuring the safe and reliable operation of the steam turbine when the steam turbine is used for micro-admission (micro-output or zero-output), not only realizing the adjustment of the output of the low-pressure cylinder of the steam turbine, but also being used for solving the problem of lower operation efficiency of the low-pressure cylinder under the working condition of low load in summer.
Description
Technical Field
The utility model belongs to the field of turbo generator sets, and particularly relates to a low-pressure cylinder steam inlet regulating and cooling system of a steam turbine.
Background
Under the double-carbon target that carbon neutralization is realized before year 2060 when carbon dioxide emission in China reaches the peak of carbon in year 2030, the national requirements on the energy consumption level of the coal motor group are more and more strict.
Meanwhile, under the conditions that the gas power generation is not in climate, the hydropower response is performed under the condition of low-carbon high-load operation, the randomness of wind and light new energy sources is not adjustable, and the energy storage power station cannot be applied on a large scale temporarily, the coal power takes on the main role of peak regulation of the power grid. Under the background, the conventional heating units which follow the principle of 'thermoelectric fixing', namely 'thermoelectric decoupling', namely, heat needs to be supplied, power needs to be adjustable, and the thermoelectric ratio can be greatly adjusted.
However, when a heating unit is subjected to a lower electrical load, the conflict in thermoelectric regulation tends to be more pronounced. In this regard, researchers have proposed low pressure cylinder zero force (cut cylinder) techniques. The technology is operated by cutting off the steam inlet of the low-pressure cylinder (a small amount of steam still leaks into the low-pressure cylinder) through a butterfly valve of a medium-low pressure communicating pipe and matching with a water spraying method of the low-pressure cylinder. However, this approach can lead to backflow in the last stages of the turbine and consequently erosion of the last stage blades. In this regard, a low-pressure cylinder cooling device (patent number: CN 211975079U) for the cut-cylinder reformation of a cogeneration turbo generator set is provided, and a temperature reducing device is arranged on a medium-low pressure communicating pipe, so that the temperature and pressure of steam discharged from the medium-pressure cylinder are reduced by the temperature reducing device, and then the steam is supplied to the low-pressure cylinder, thereby ensuring the quality of the cooling steam supplied to the low-pressure cylinder and effectively reducing the erosion of cooling water to the final stage blade of the steam turbine. However, if the caliber of the medium-low pressure communicating pipe is larger and the regulating valve and the temperature reducing device are arranged, on one hand, during normal operation, the regulating valve can bring larger steam inlet resistance loss, so that the economical efficiency is reduced; on the other hand, when the valve needs to be adjusted, the valve is usually provided with a butterfly valve due to the large caliber of the medium-low pressure communicating pipe, the adjustment precision is poor in the case of small flow, when the micro-output or zero-output of the low-pressure cylinder needs to be realized, the low-pressure cylinder can only enter the steam in a micro amount, and because the butterfly valve is too poor in adjustment precision under the working condition, the precise control cannot be realized, and great hidden danger is brought to the running economy and safety of the low-pressure cylinder.
On the other hand, under the design working condition, the general turbine can keep the best efficiency of the through flow of the turbine, and once the through flow deviates from the design working condition, such as summer working condition, the volume flow of the exhaust steam of the low-pressure cylinder is obviously reduced due to high temperature of circulating water and high back pressure of the unit, so that the residual speed loss is obviously increased. Especially, when the unit is in a low-load operation working condition under high back pressure, the volume flow of the exhaust steam of the actual low-pressure cylinder is seriously smaller than that of the actual low-pressure cylinder in comparison with the design working condition, so that the exhaust steam residual speed loss of the low-pressure cylinder is sharply increased, and the efficiency is obviously reduced. Therefore, it is necessary to study how to maintain higher operating efficiency during low load operation of the summer unit.
Accordingly, a person skilled in the art is dedicated to developing a steam turbine low pressure cylinder steam inlet regulating and cooling system, so as to realize accurate regulation and control of steam turbine low pressure cylinder steam inlet parameters, thereby avoiding the problem of air blast overtemperature which is easy to occur when the low pressure cylinder is used for micro-admission, ensuring safe and reliable operation of the steam turbine when the low pressure cylinder is used for micro-admission (micro-output or zero output), realizing safe operation of the low pressure cylinder of the steam turbine under the working condition of small micro-admission flow, and ensuring that part of the low pressure cylinder safely enters the micro-admission to operate under the working condition of high back pressure and low load in summer of a plurality of low pressure cylinders of the steam turbine, which is equivalent to cutting off part of the low pressure cylinder on line, reducing the effective steam exhaust area of the steam turbine, and further solving the problem of low efficiency of the low pressure cylinder of the steam turbine generator set when the low load is used in summer.
Disclosure of Invention
In order to achieve the above object, the present utility model provides a low pressure cylinder admission adjustment cooling system for a steam turbine, at least comprising: the device comprises a steam turbine medium-low pressure communicating pipe, a communicating pipe block valve, a low pressure cylinder steam inlet bypass, a steam inlet bypass block valve, a steam inlet bypass regulating valve and a temperature reducing device. The two ends of the medium-low pressure communicating pipe are connected with a medium-pressure cylinder steam exhaust pipeline and a low-pressure cylinder steam inlet pipeline, and the low-pressure cylinder steam inlet bypass is connected with the medium-low pressure communicating pipe in parallel. The temperature reducing water device is also provided with a temperature reducing water pipe, a temperature reducing water regulating valve and a temperature reducing water isolating valve.
According to the steam turbine low-pressure cylinder steam inlet regulating and cooling system, the steam inlet bypass of the medium-low pressure communicating pipe is arranged, and the regulating valve and the temperature reducing device are arranged on the bypass pipeline, so that the accurate control of the steam inlet parameters of the low-pressure cylinder under the small and micro steam inlet flows including the steam inlet pressure and the temperature can be realized, the operation safety of the low-pressure cylinder under the small and micro steam inlet conditions (the low-pressure cylinder micro-output or zero-output state) is ensured, and the problem of low-pressure cylinder blast temperature rise caused by the high superheat degree of the low-pressure cylinder micro steam inlet and the low cooling effect is avoided.
Because the low-pressure cylinder steam inlet bypass pipeline system is arranged, the utility model needs to keep a hot standby state in the operation process, namely, the steam inlet bypass pipeline can be opened or slightly opened in the normal starting or operation process of the unit, thereby ensuring the hot standby state. And once the micro-amount of steam inlet is needed, the low-pressure cylinder steam inlet can be cut into the bypass pipeline system, and the low-pressure cylinder steam inlet parameters can be accurately controlled according to the low-pressure cylinder steam outlet temperature.
Further, for a unit with 2 or 3 low pressure cylinders, each low pressure cylinder is sequentially connected with a middle pressure cylinder, the unit is called a first low pressure cylinder close to the middle pressure cylinder, the rest is sequentially called a second low pressure cylinder and a third low pressure cylinder, a low pressure cylinder steam inlet bypass is arranged and is respectively connected with a middle and low pressure communicating pipe steam discharge end of the first low pressure cylinder and steam inlet ends of the second low pressure cylinder and the third low pressure cylinder, and a partition valve is respectively arranged at the steam inlet ends of the second low pressure cylinder and the third low pressure cylinder, so that the output of the third low pressure cylinder and the output of the second low pressure cylinder can be sequentially regulated according to the running season and the load condition of the unit until zero output, the running safety of the unit is ensured, and the running efficiency of the first low pressure cylinder is ensured.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model is provided with the low-pressure cylinder steam inlet bypass pipeline which is much smaller than the caliber of the original medium-low pressure communicating pipe, so that the regulating valve is much higher in regulating precision under small and micro flow, and meanwhile, the steam inlet temperature of the low-pressure cylinder can be further accurately controlled by arranging the temperature reducing device, thereby avoiding the problem of steam exhaust overtemperature of the low-pressure cylinder under small and micro flow on the steam inlet parameter source head of the low-pressure cylinder;
2. because the low-pressure cylinder steam inlet bypass is connected with the original medium-low pressure connecting pipe in parallel, the steam inlet bypass can always keep the running state as the original medium-low pressure connecting pipe as long as the medium-pressure cylinder works normally, and thus the steam source safety of the low-pressure cylinder can be ensured.
3. Because the safe and reliable operation of the steam turbine in the process of micro steam admission (micro output or zero output) is realized, the safety of the low-pressure cylinder of the steam turbine can be ensured under the working condition of large-scale heat supply of the steam turbine and small flow steam admission of the low-pressure cylinder, and the problem that the efficiency of the low-pressure cylinder of a large-sized steam turbine generator unit with multiple low-pressure cylinders is low in summer can be solved.
The conception, specific structure, and technical effects of the present utility model will be further described below to fully understand the objects, features, and effects of the present utility model.
Drawings
Figures 1-3 are schematic illustrations of specific embodiments of the present utility model.
Wherein, 1 is a medium pressure cylinder; 2- -a low pressure cylinder; 2 a-a first low pressure cylinder; 2 b-a second low pressure cylinder; 2 c-a third low pressure cylinder; 3- -medium-low pressure communicating tube; 4- -a communication pipe isolating valve; 4a- -a communication pipe block valve I; 4b- -a communication pipe shutoff valve II; 5-a low pressure cylinder steam inlet bypass; 6- -an admission bypass block valve; 7- -an admission bypass regulator valve; 8- -a temperature reducing device; 9- -a temperature reducing water pipe; 10- -a desuperheating water regulating valve; 11- -a desuperheating water isolation valve; 12a- -a block valve; 12b- -a block valve;
Detailed Description
The utility model will be described in further detail with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical scheme of the present utility model, and a detailed implementation mode is given, but the protection scope of the present utility model is not limited to the following embodiments.
Example 1:
as shown in fig. 1, the low-pressure cylinder steam inlet regulating and cooling system of the steam turbine comprises a medium-pressure cylinder 1, a low-pressure cylinder 2, a medium-low pressure communicating pipe 3, a communicating pipe isolating valve 4, a low-pressure cylinder steam inlet bypass 5, a steam inlet bypass isolating valve 6, a steam inlet bypass regulating valve 7 and a temperature reducing water device 8. Wherein, the two ends of the medium-low pressure communicating pipe 3 are connected with the steam exhaust pipeline of the medium-pressure cylinder 1 and the steam inlet pipeline of the low-pressure cylinder 2. The low-pressure cylinder steam inlet bypass 5 is connected with the medium-low pressure communicating pipe 3 in parallel. The temperature reducing device 8 is also provided with a temperature reducing water pipe 9, a temperature reducing water regulating valve 10 and a temperature reducing water isolating valve 11.
When the unit needs low-pressure cylinder micro-output or zero-output operation, the communicating pipe isolating valve 4 can be gradually closed, steam entering the low-pressure cylinder from the middle-pressure communicating pipe is cut off, the steam inlet bypass isolating valve 6 on the low-pressure cylinder steam inlet bypass 5 is simultaneously opened, and the steam inlet bypass regulating valve 7 and the temperature reducing device 8 are regulated to ensure that the steam inlet pressure and the temperature parameters of the low-pressure cylinder are controlled even under the condition of small and trace steam inlet, so that the high steam exhaust temperature of the low-pressure cylinder is avoided, and the operation safety of the low-pressure cylinder is ensured.
In order to maintain the hot standby state of the low-pressure cylinder steam inlet bypass pipeline system, the low-pressure cylinder steam inlet bypass regulating valve can be opened or kept at a certain opening degree in the starting or normal operation process of the unit, and can be regulated according to the requirement when the low-pressure cylinder steam inlet bypass pipeline system needs to be switched.
It should be noted that, the low pressure cylinder steam inlet bypass pipeline can be adjusted according to the low pressure cylinder output, the pipeline specification can be set as DN 50-DN 300 according to the requirement, the adjustable adjusting precision of the steam inlet bypass adjusting valve is relatively high, the adjusting range of the low pressure cylinder output is relatively wide, if the low pressure cylinder output is not required to be adjusted, only a low pressure cylinder zero output system is required, the low pressure cylinder steam inlet bypass can be directly set as a smaller pipeline specification, such as DN50, thus the investment can be greatly saved, and the implementation is relatively easy.
Example 2:
as shown in fig. 2, the low-pressure cylinder steam inlet regulating and cooling system of the steam turbine comprises a medium-pressure cylinder 1, a low-pressure cylinder 2, a medium-low pressure communicating pipe 3, a communicating pipe isolating valve 4, a low-pressure cylinder steam inlet bypass 5, a steam inlet bypass isolating valve 6, a steam inlet bypass regulating valve 7 and a temperature reducing water device 8. The two ends of the medium-low pressure communicating pipe 3 are connected with the steam exhaust pipeline of the medium-pressure cylinder 1 and the steam inlet pipelines of the low-pressure cylinders 2a (first low-pressure cylinder) and 2b (second low-pressure cylinder). The low-pressure cylinder steam inlet bypass 5 is connected with the medium-low pressure communicating pipe 3 in parallel. The temperature reducing device 8 is also provided with a temperature reducing water pipe 9, a temperature reducing water regulating valve 10 and a temperature reducing water isolating valve 11.
Under the working condition of low load in summer of unit operation, the volume flow of the exhaust steam of the low-pressure cylinder is obviously reduced due to the high back pressure of the exhaust steam of the low-pressure cylinder, so that the residual speed loss is increased. In particular, when the unit is in a low-load operation condition, the volume flow of the exhaust steam of the actual low-pressure cylinder is seriously smaller than that of the actual low-pressure cylinder in comparison with the design condition, so that the exhaust steam residual speed loss of the low-pressure cylinders 2a (the first low-pressure cylinder) and 2b (the second low-pressure cylinder) is relatively greatly increased, and the efficiency is obviously reduced.
In this embodiment, due to the arrangement of the low pressure cylinder steam inlet bypass, when the working condition of low load in summer is met, the communicating pipe blocking valve 4 can be gradually closed until the steam entering the low pressure cylinder 2b (the second low pressure cylinder) from the medium-low pressure communicating pipe is cut off, meanwhile, the steam inlet bypass blocking valve 6 on the low pressure cylinder steam inlet bypass 5 is opened, and the steam inlet parameters including pressure and temperature entering the low pressure cylinder 2b (the second low pressure cylinder) are accurately controlled by adjusting the steam inlet bypass adjusting valve 7 and the temperature reducing device 8, so that the steam exhaust temperature of the low pressure cylinder is still within the safe range even under the conditions of small and trace steam inlet of the low pressure cylinder 2b (the second low pressure cylinder), thereby ensuring the operation safety of the low pressure cylinder 2b (the second low pressure cylinder). In this way, the steam, which was originally split into the two low-pressure cylinders, is collected in the low-pressure cylinder 2a (first low-pressure cylinder). At this time, the steam flow of the low pressure cylinder 2a (first low pressure cylinder) is increased, the operation condition is improved, the improvement of the efficiency of the low pressure cylinder 2a (first low pressure cylinder) is realized, and the safe operation of the low pressure cylinder 2b (second low pressure cylinder) with micro-output or zero output is ensured.
Example 3
As shown in fig. 3, the low-pressure cylinder steam inlet regulating and cooling system of the steam turbine comprises a medium-pressure cylinder 1, a low-pressure cylinder 2, a medium-pressure and low-pressure communicating pipe 3, a communicating pipe isolating valve I4 a, a communicating pipe isolating valve II 4b, a low-pressure cylinder steam inlet bypass 5, a steam inlet bypass isolating valve 6, a steam inlet bypass regulating valve 7 and a temperature reducing water device 8. The two ends of the medium-low pressure communicating pipe 3 are connected with the steam exhaust pipeline of the medium-pressure cylinder 1 and the steam inlet pipelines of the low-pressure cylinders 2a (first low-pressure cylinder), 2b (second low-pressure cylinder) and 2c (third low-pressure cylinder). The low-pressure cylinder steam inlet bypass 5 is connected with the medium-low pressure communicating pipe 3 in parallel. The low-pressure cylinder intake bypass 5 is provided with block valves 12a and 12b. The temperature reducing device 8 is also provided with a temperature reducing water pipe 9, a temperature reducing water regulating valve 10 and a temperature reducing water isolating valve 11.
In this embodiment 3, on the basis of the low-load working condition in summer in embodiment 2, a set of 3 low-pressure cylinders (6 exhaust cylinders) is further considered. When the working condition of low load in summer is met, the first communicating pipe blocking valve 4a is kept open, the blocking valve 12a is closed, the second communicating pipe blocking valve 4b is gradually closed until the steam entering the low pressure cylinder 2c from the medium-low pressure communicating pipe is cut off, meanwhile, the steam inlet bypass blocking valve 6 and the blocking valve 12b on the low pressure cylinder steam inlet bypass 5 are opened, and the steam inlet parameters including pressure and temperature entering the low pressure cylinder 2c (third low pressure cylinder) are accurately controlled by adjusting the steam inlet bypass adjusting valve 7 and the temperature reducing device 8, so that the steam outlet temperature of the low pressure cylinder is still in a safe range even under the conditions of small and trace steam inlet of the low pressure cylinder 2c (third low pressure cylinder), and the operation safety of the low pressure cylinder 2c (third low pressure cylinder) is ensured.
When the load continues to decrease, the first communicating pipe blocking valve 4a can be closed to further cut off the steam entering the low pressure cylinder 2b from the medium-low pressure communicating pipe, and at the same time, the blocking valve 12a on the low pressure cylinder steam inlet bypass 5 is opened, and by adjusting the steam inlet bypass adjusting valve 7 and the temperature reducing device 8, the steam inlet parameters entering the low pressure cylinders 2b (second low pressure cylinder) and 2c (third low pressure cylinder) are precisely controlled to ensure the operation safety of the low pressure cylinders 2b (second low pressure cylinder) and 2c (third low pressure cylinder).
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (3)
1. The low-pressure cylinder steam inlet regulating and cooling system of the steam turbine is characterized by comprising a middle-pressure cylinder, a low-pressure cylinder, a middle-pressure and low-pressure communicating pipe of the steam turbine, a communicating pipe isolating valve, a low-pressure cylinder steam inlet bypass, a steam inlet bypass isolating valve, a steam inlet bypass regulating valve and a temperature reducing device, wherein two ends of the middle-pressure and low-pressure communicating pipe of the steam turbine are connected with a steam exhaust pipeline of the middle-pressure cylinder and a steam inlet pipeline of the low-pressure cylinder, and a low-pressure cylinder steam inlet bypass is connected with the middle-pressure and low-pressure communicating pipe in parallel; the low-pressure cylinder steam inlet bypass is characterized in that the steam inlet bypass block valve, the steam inlet bypass regulating valve and the temperature reducing device are all arranged on the low-pressure cylinder steam inlet bypass, the temperature reducing device is also provided with a temperature reducing water pipe, a temperature reducing water regulating valve and a temperature reducing water isolating valve, and the pipeline specification of the low-pressure cylinder steam inlet bypass is DN 50-DN 300.
2. The steam turbine low pressure cylinder admission regulating and cooling system as set forth in claim 1, wherein said low pressure cylinders are 2, namely a first low pressure cylinder and a second low pressure cylinder; the first low pressure cylinder and the second low pressure cylinder are sequentially connected with the medium pressure cylinder, and the low pressure cylinder steam inlet bypass is respectively connected with the steam exhaust end of the medium and low pressure communicating pipe of the first low pressure cylinder and the steam inlet end of the second low pressure cylinder.
3. The steam turbine low pressure cylinder admission regulating and cooling system as set forth in claim 1, wherein said low pressure cylinders are 3, namely, a first low pressure cylinder, a second low pressure cylinder and a third low pressure cylinder; the first low pressure cylinder, the second low pressure cylinder and the third low pressure cylinder are sequentially connected with the medium pressure cylinder, the low pressure cylinder steam inlet bypass is respectively connected with the steam exhaust end of the medium and low pressure communicating pipe of the first low pressure cylinder and the steam inlet ends of the second low pressure cylinder and the third low pressure cylinder, and the steam inlet ends of the second low pressure cylinder and the third low pressure cylinder are respectively provided with a block valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320230396.3U CN219910887U (en) | 2023-02-16 | 2023-02-16 | Steam turbine low pressure cylinder admission adjusting and cooling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320230396.3U CN219910887U (en) | 2023-02-16 | 2023-02-16 | Steam turbine low pressure cylinder admission adjusting and cooling system |
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