CN209892275U - Temperature control system for eliminating expansion difference and deformation of low-pressure cylinder - Google Patents
Temperature control system for eliminating expansion difference and deformation of low-pressure cylinder Download PDFInfo
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- CN209892275U CN209892275U CN201920297748.0U CN201920297748U CN209892275U CN 209892275 U CN209892275 U CN 209892275U CN 201920297748 U CN201920297748 U CN 201920297748U CN 209892275 U CN209892275 U CN 209892275U
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Abstract
The utility model relates to the technical field of new energy power generation application, in particular to a temperature control system for eliminating low-pressure cylinder differential expansion and deformation, which cools or heats the outer wall of a low-pressure inner cylinder by leading working medium water with corresponding temperature, solves the problems of large temperature difference, large differential expansion, large deformation, open joint surface, broken cylinder body reinforcing ribs, even the secondary stage, the overtemperature of the last stage movable vane, transfinite expansion, small dynamic and static clearance collision and friction vibration and the like caused by blowing loss and heat initiation of the movable vanes at all stages under the full working condition of three low-pressure cylinder cutting working conditions including back condensation, zero power and zero steam admission reforming, realizes the cooling steam and water spraying temperature reduction after back condensation or zero reforming of the low-pressure cylinder, avoids the problems of steam turbine water impact and vane water erosion, optimizes the design and manufactures the high-efficiency low-flow cylinder with smaller axial clearance, the operation safety and the economical efficiency of the unit are improved.
Description
Technical Field
The utility model relates to a new forms of energy electricity generation application technology field, concretely relates to eliminate temperature control system of low pressure cylinder differential expansion, deformation.
Background
Along with the relative saturation of the installed capacity of the power supply, the thermal power generating unit operates at low load with the output of less than or equal to 50% of rated capacity, even the deep peak regulation of less than or equal to 30% becomes a normal state, the deep peak regulation and the thermoelectric decoupling are realized by carrying out thermal power flexibility transformation, and the method is a necessary way for absorbing new energy and improving the utilization rate of renewable energy. The major thermoelectric decoupling techniques in the industry today include: the low-pressure double-rotor high-back pressure reforming technology of the steam turbine, the low-pressure rotor optical axis reforming technology, the backpressure machine reforming technology, the bypass heat supply technology, the electric boiler technology, the heat storage tank technology, the low-pressure cylinder cutting technology and the like. The low-pressure cylinder cutting technology comprises the condensation extraction back reconstruction of a Hua-Feng power science research institute and the low-pressure cylinder near-zero power reconstruction of a Xian thermal research institute in the prior art.
When the unit operates in a working condition with the rated capacity of more than or equal to 50 percent for a long time, the steam inlet temperature of the low-pressure cylinder is generally more than or equal to 200 ℃, the temperature of the outer wall of the low-pressure inner cylinder is close to the steam exhaust temperature of the low-pressure cylinder and less than or equal to 35 ℃, and the problem of large temperature difference between the inner wall and the outer wall of the low-pressure inner cylinder exists, so that the expansion difference of the low-. Therefore, although the low-pressure cylinder has a higher wall thickness and a smaller wall thickness of the intermediate-pressure cylinder and a lower steam inlet parameter, the low-pressure cylinder has a higher expansion difference design value and even a higher actual operation value, and the intermediate-pressure cylinder has a larger expansion difference value, so that a manufacturer designs and manufactures the intermediate-pressure cylinder by taking a larger axial through-flow clearance to ensure the operation safety of the unit at the expense of economy. The high temperature difference between the inner wall and the outer wall of the low-pressure inner cylinder causes the problems of large deformation of the low-pressure cylinder, large opening of a joint surface, air leakage, frequent breakage of reinforcing ribs of the low-pressure cylinder body and the like.
When the unit runs under a long-term empty load or a low load of which the rated capacity is less than or equal to 50 percent, the coal consumption is high, the economical efficiency is poor, and simultaneously, the last stages of blades are easy to erode by water, because the steam flow is small, the heat generated by blast friction cannot be taken away, the exhaust temperature of the steam turbine is increased, the operation safety of a rotor can be endangered, the expansion difference of a low-pressure cylinder exceeds the limit, and meanwhile, the low-pressure cylinder is large in thermal deformation and easy to cause radial and axial clearance to be reduced, and dynamic and static collision.
When the unit operates under the working condition of small volume flow or the working condition of no steam flow for a long time, blast loss caused by friction heating of movable blades at all stages exists, particularly the problem that the blast friction of blades at the next and last stages is serious to show friction heating overtemperature, if three low-pressure cylinder cutting working conditions of condensed back extraction transformation, low-pressure cylinder near-zero power transformation and low-pressure cylinder zero steam admission transformation in the prior art are adopted. The heat generated by blast friction can not be taken away, so that the exhaust temperature of the steam turbine is increased, the operation safety of a rotor can be endangered, the expansion difference of the low-pressure cylinder exceeds the limit, and meanwhile, the low-pressure cylinder is large in thermal deformation and easy to cause radial and axial clearance to be reduced, and dynamic and static friction causes vibration.
As mentioned above, the unit operates under the working conditions of long-term empty load or low load with rated capacity less than or equal to 50%, small volume flow and no steam flow, and the unit operates under the working conditions of condensation extraction back reconstruction, low-pressure cylinder near-zero power reconstruction and low-pressure cylinder zero steam admission reconstruction in the prior art, and all the three low-pressure cylinder cutting-off technologies of the prior art have the problems of low cooling steam, blast loss caused by air leakage, over-temperature of the low-pressure cylinder, expansion difference increase, deformation and the like, so that the operation safety of the unit is seriously threatened. Even if the safe economic load working condition of the rated capacity of more than or equal to 50 percent normally operates, the problems of large expansion difference and large deformation caused by large temperature difference between the inner wall and the outer wall of the low-pressure cylinder still exist, and the operation safety of the unit is endangered, so that a manufacturer designs and manufactures the large axial through-flow clearance to sacrifice the economy to ensure the operation safety of the unit.
Therefore, a technical scheme is urgently needed to solve the problems of safety hazards caused by blast loss and friction heating of movable blades at all stages under the cutting conditions of three low-pressure cylinder cutting conditions including a condensed back extraction technology, a zero-power technology and a zero-admission transformation technology, large temperature difference between the inner wall and the outer wall of a low-pressure inner cylinder, large expansion difference, large deformation, opening of a joint surface, breakage of a cylinder body reinforcing rib, low load and even three low-pressure cylinder cutting conditions, over-temperature of movable blades at last stage and last stage, over-limit expansion difference, small dynamic and static clearance, friction vibration and the like, the investment of a cooling steam and water spraying temperature reduction system required after the condensed back extraction or the low-pressure cylinder is cut off after zero-force transformation is avoided, the problems of water impact and blade water erosion caused by water spraying temperature reduction are solved, and a high-efficiency low-pressure cylinder with a smaller axial through-flow clearance is.
SUMMERY OF THE UTILITY MODEL
Therefore, the embodiment of the utility model provides an eliminate temperature control system that low pressure cylinder expands poor, warp to solve above-mentioned problem.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a temperature control system for eliminating expansion difference and deformation of a low-pressure cylinder comprises: a demineralized water tank, an inlet pipeline, a demineralized water pump, an outlet pipeline, a first demineralized water regulating valve, a second demineralized water regulating valve, a demineralized water main pipe, a first demineralized water branch pipe, a second demineralized water branch pipe, a third demineralized water branch pipe, a condenser, a first condensate pipe, a condensate booster pump, a condensate regulating valve, a condensate main pipe, a second condensate pipe, a third condensate pipe, a fourth condensate pipe, a fifth condensate pipe, a sixth condensate pipe, a low-pressure water supply pipe, a low-temperature section mixed water main pipe, a medium-temperature section mixed water main pipe, a high-temperature section mixed water main pipe, a reverse-rotation side low-temperature section mixed water pipe, a normal-rotation side low-temperature section mixed water pipe, a reverse-rotation side medium-temperature section mixed water pipe, a normal-rotation side medium-temperature section mixed water pipe, a reverse-rotation side high-temperature section mixed water pipe, a normal-rotation side high-temperature section mixed water pipe,
import and export that the demineralized water pump was connected respectively to inlet line and outlet pipe, first condensate pipe and condensate booster pump access connection, the second condensate pipe is connected in low temperature section shaft seal heater upper reaches, the third condensate pipe is with the low exit linkage that adds of moderate temperature section No. three, the fourth condensate pipe is with the low temperature section No. four low exit linkage that adds, the fifth condensate pipe is with the low exit linkage that adds of moderate temperature section No. four, the sixth condensate pipe is with the high temperature section No. four low exit linkage that adds, the oxygen-eliminating device is connected to the low pressure water supply pipe.
Further, still include that the side low temperature section that turns round mixes warm water pipe, the side low temperature section that just revolves mixes warm water pipe, and the side moderate temperature section that turns round mixes warm water pipe, and the side moderate temperature section that just revolves mixes warm water pipe, and the side high temperature section that turns round mixes warm water pipe, is provided with a plurality of governing valves on the side high temperature section that just revolves mixes warm water pipe respectively.
Preferably, the upstream and downstream of the plurality of regulating valves are respectively provided with a front shutoff valve and a rear shutoff valve, and the plurality of regulating valves are in bypass connection with a bypass valve. Therefore, when the regulating valves are damaged, the front shutoff door and the rear shutoff door which are connected with the regulating valves can be closed, and the bypass door which is connected with the regulating valves in a bypass mode can be opened, so that the system cannot be influenced, and the damaged regulating valves can be conveniently replaced.
The pipelines behind the plurality of regulating valves are respectively connected with a counter-rotating side upper cylinder temperature mixing water pipe, a counter-rotating side upper cylinder temperature mixing water annular pipe, a counter-rotating side lower cylinder temperature mixing water annular pipe, a plurality of water nozzles symmetrically arranged on the upper outer cylinder and the lower outer cylinder of the low-pressure inner cylinder, a temperature measuring point of an inner cavity of the low-pressure inner cylinder and a temperature measuring point of a wall of the low-pressure inner cylinder.
Further, preferred low-pressure inner cylinder chamber temperature measuring points include, but are not limited to, a last-stage movable blade inlet steam temperature measuring point, a last-stage stationary blade partition plate inlet steam temperature measuring point, a last-stage regenerative steam extraction chamber steam temperature measuring point, a next-last-stage regenerative steam extraction chamber steam temperature measuring point, and a low-pressure cylinder steam inlet chamber steam temperature measuring point.
Further, the preferable low-pressure inner cylinder wall temperature measuring point is configured in a mode of synchronously measuring the inner wall temperature, the outer wall temperature and the middle wall temperature of the low-pressure inner cylinder at three points, and the measuring positions include, but are not limited to, the low-pressure inner cylinder wall temperature measuring point at the last stage partition plate, the low-pressure inner cylinder wall temperature measuring points at the last stage and the next last stage back-heating steam extraction chamber partition plates, and the low-pressure inner cylinder wall temperature measuring points at the first stage back-heating steam extraction chamber and the low-pressure cylinder steam inlet chamber partition plate.
Furthermore, first demineralized water branch pipe, second demineralized water branch pipe, third demineralized water branch pipe, second condensate pipe, third condensate pipe, fifth condensate pipe, sixth condensate pipe, low pressure feed pipe are connected with first isolation door, first check valve.
Furthermore, the desalting water pump and the condensed water booster pump are connected with the inlet of the water feeding pump through a second isolating door, and the outlet of the water feeding pump is connected with a third isolating door and a second check valve.
Furthermore, the condensate mother pipe is connected with a shaft seal heater, a first low-pressure heater, a second low-pressure heater, a third low-pressure heater, a fourth low-pressure heater and a deaerator.
Furthermore, the shaft seal heater, a low-pressure heater, a second low-pressure heater, a third low-pressure heater, a fourth isolation door is connected to the inlet of the fourth low-pressure heater, a fifth isolation door is connected to the outlet of the fourth low-pressure heater, a bypass door is arranged, and a sixth isolation door is connected to the inlet of the deaerator.
Furthermore, the outlet pipeline and the condensed water main pipe are respectively provided with an adjusting valve.
Preferably, the upstream and downstream of the regulating valve are respectively provided with a front shutoff door and a rear shutoff door, and the regulating valve is connected with a bypass door in a bypass mode. Thus, when the regulating valve is damaged, the front shutoff door and the rear shutoff door which are connected with the regulating valve can be closed, and the bypass door which is connected with the bypass can be opened, so that the system can not be influenced, the damaged regulating valve can be conveniently replaced,
furthermore, a pressure measuring point and a temperature measuring point are respectively arranged on the low-temperature-section warm water mixing main pipe, the medium-temperature-section warm water mixing main pipe and the high-temperature-section warm water mixing main pipe.
Further, the temperature measuring point of the inner cavity of the low-pressure inner cylinder, the temperature measuring point of the wall of the low-pressure inner cylinder and the temperature measuring point equipment are selected from one or more of thermal resistors, thermocouples and in-situ metal thermometers.
The temperature value of a cavity temperature measuring point and a wall temperature measuring point of a low-pressure inner cylinder is monitored, the working medium water quantity is adjusted through a plurality of adjusting valves, the heating or cooling of the outer wall of a low-pressure cylinder at a medium-temperature section and a high-temperature section is realized, the outer wall of the low-temperature section and the low-pressure cylinder is cooled as required, the wall temperature of each section of low-pressure cylinder is adjusted and maintained, the temperature difference between the inner wall and the outer wall of the low-pressure inner cylinder is eliminated to the maximum extent, the wall temperature of the low-pressure inner cylinder is ensured to be close to the temperature of a rotor, the expansion difference of the low-pressure cylinder is eliminated, the problems that the deformation of the low-pressure inner cylinder is large due to the large wall temperature difference, a joint surface is open, a cylinder body reinforcing rib is broken and the like are solved, the forced cooling water takes away the heat generated by blast loss. The problem that the operation safety of the unit is seriously endangered is solved, further, the design and the manufacture are optimized, the efficiency of the low-pressure cylinder for lifting the axial through-flow gap of the low-pressure cylinder is reduced, and the safety and the economical efficiency of the operation of the low-pressure cylinder are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is the schematic diagram of the temperature control system for eliminating the expansion difference and deformation of the low-pressure cylinder of the present invention.
In the figure:
1-a desalted water tank, 2-an inlet pipeline, 3-a desalted water pump, 4-an outlet pipeline, 5-a first desalted water regulating valve, 6-a second desalted water regulating valve, 7-a desalted water main pipe, 8-a first desalted water branch pipe, 9-a second desalted water branch pipe, 10-a third desalted water branch pipe, 11-a condenser, 12-a first condensate pipe, 13-a condensate booster pump, 14-a condensate main pipe, 15-a second condensate pipe, 16-a third condensate pipe, 17-a fourth condensate pipe, 18-a fifth condensate pipe, 19-a sixth condensate pipe, 20-a low pressure water supply pipe, 21-a first isolating door, 22-a first check door, 23-a low temperature section mixed warm water main pipe, 24-a medium temperature section mixed warm water main pipe, 25-high temperature section mixed water mother pipe, 26-counter-rotating side low temperature section mixed water pipe, 27-forward rotating side low temperature section mixed water pipe, 28-counter-rotating side middle temperature section mixed water pipe, 29-forward rotating side middle temperature section mixed water pipe, 30-counter-rotating side high temperature section mixed water pipe, 31-forward rotating side high temperature section mixed water pipe, 32-counter-rotating side upper cylinder mixed water pipe, 33-counter-rotating side upper cylinder mixed water annular pipe, 34-counter-rotating side lower cylinder mixed water pipe, 35-counter-rotating side lower cylinder mixed water annular pipe, 36-water spray nozzle, 37-low pressure inner cylinder, 38-low pressure inner cylinder inner chamber temperature measuring point, 39-low pressure inner cylinder wall temperature measuring point, 40-low pressure shaft seal heater, 41-first low pressure heater, 42-second low pressure heater, 43-third low pressure heater, 44-fourth low pressure heater, 45-deaerator, 46-water feed pump, 47-second isolation door, 48-third isolation door, 49-second check valve, 50-fourth isolation door, 51-fifth isolation door, 52-bypass door, 53-sixth isolation door, 54-condensed water regulating valve, 55-first regulating valve, 56-second regulating valve, 57-third regulating valve, 58-fourth regulating valve, 59-fifth regulating valve, 60-sixth regulating valve, 61-front shutoff door, 62-rear shutoff door, 63-bypass door, 64-pressure measuring point, 65-temperature measuring point
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present embodiment discloses a temperature control system for eliminating differential expansion and deformation of a low-pressure cylinder, including: a demineralized water tank 1, an inlet pipeline 2, a demineralized water pump 3, an outlet pipeline 4, a first demineralized water regulating valve 5, a second demineralized water regulating valve 6, a demineralized water main pipe 7, a first demineralized water branch pipe 8, a second demineralized water branch pipe 9, a third demineralized water branch pipe 10, a condenser 11, a first condensate pipe 12, a condensate booster pump 13, a condensate regulating valve 54, a condensate main pipe 14, a second condensate pipe 15, a third condensate pipe 16, a fourth condensate pipe 17, a fifth condensate pipe 18, a sixth condensate pipe 19, a low-pressure water supply pipe 20, a low-temperature section mixed warm water main pipe 23, a medium-temperature section mixed warm water main pipe 24, a high-temperature section mixed warm water main pipe 25, a reverse-rotation side low-temperature section mixed water pipe 26, a forward-rotation side low-temperature section mixed water pipe 27, a reverse-rotation side medium-temperature section mixed water pipe 28, a forward-rotation side medium-temperature section mixed water pipe 29, a reverse-rotation side high-temperature section mixed water pipe 30, a forward-side high-temperature section mixed water pipe 31, further, a counter-rotating side low-temperature section temperature mixing water pipe 26, a forward-rotating side low-temperature section temperature mixing water pipe 27, a counter-rotating side intermediate-temperature section temperature mixing water pipe 28, a forward-rotating side intermediate-temperature section temperature mixing water pipe 29, a counter-rotating side high-temperature section temperature mixing water pipe 30 and a forward-rotating side high-temperature section temperature mixing water pipe 31 are respectively provided with a plurality of adjusting valves 55, 56, 57, 58, 59 and 60.
Preferably, in the present embodiment, a front shutoff door 61 and a rear shutoff door 62 are respectively provided upstream and downstream of the plurality of regulating valves 55, 56, 57, 58, 59, 60, and a bypass door 63 is bypass-connected to the plurality of regulating valves 55, 56, 57, 58, 59, 60. Thus, when the plurality of regulating valves 55, 56, 57, 58, 59, 60 are damaged, the front and rear shutoff doors 61, 62 connected thereto can be closed and the bypass door 63 connected by-pass thereto can be opened, and at this time, the system is not affected, and the damaged regulating valves can be replaced easily.
The pipelines behind the regulating valves 55, 56, 57, 58, 59 and 60 are respectively connected with a reverse-rotation side upper cylinder temperature mixing water pipe 32, a reverse-rotation side upper cylinder temperature mixing water annular pipe 33, a reverse-rotation side lower cylinder temperature mixing water pipe 34, a reverse-rotation side lower cylinder temperature mixing water annular pipe 35, a plurality of water nozzles 36 which are symmetrically arranged on the upper and lower outer cylinders of the low-pressure inner cylinder, the low-pressure inner cylinder 37, a low-pressure inner cylinder inner cavity temperature measuring point 38 and a low-pressure inner cylinder wall temperature measuring point 39.
Further, the preferred low-pressure inner cylinder chamber temperature measuring point 38 in this embodiment includes, but is not limited to, a last stage moving blade inlet steam temperature measuring point, a last stage stationary blade partition plate inlet steam temperature measuring point, a last stage regenerative steam extraction chamber steam temperature measuring point, a next last stage regenerative steam extraction chamber steam temperature measuring point, and a low-pressure cylinder steam inlet chamber steam temperature measuring point.
Further, in the preferred low-pressure inner cylinder wall temperature measuring point 39 in this embodiment, the measuring points are configured in a manner of synchronously measuring the inner wall temperature, the outer wall temperature, and the middle wall temperature of the low-pressure inner cylinder at three points, and the measuring points include, but are not limited to, the low-pressure inner cylinder wall temperature measuring point at the last stage partition plate, the low-pressure inner cylinder wall temperature measuring points at the last and last stage back-heating steam extraction chamber partition plates, and the low-pressure inner cylinder wall temperature measuring points at the first stage back-heating steam extraction chamber and the low-pressure cylinder steam inlet chamber partition plate.
Furthermore, the first demineralized water branch pipe 8, the second demineralized water branch pipe 9, the third demineralized water branch pipe 10, the second condensate pipe 15, the third condensate pipe 16, the fifth condensate pipe 18, the sixth condensate pipe 19 and the low-pressure water supply pipe 20 are connected with a first isolating valve 21 and a first check valve 22.
Furthermore, the demineralized water pump 3, the condensed water booster pump 13 and the feed water pump 46 are connected with a second isolation door 47 at the inlet, and connected with a third isolation door 48 and a second check door 49 at the outlet.
Further, the condensate header 14 is connected with a shaft seal heater 40, a first low pressure heater 41, a second low pressure heater 42, a third low pressure heater 43, a fourth low pressure heater 44 and a deaerator 45.
Further, the shaft seal heater 40, the first low-pressure heater 41, the second low-pressure heater 42, the third low-pressure heater 43 and the fourth low-pressure heater 44 are connected with a fourth isolation door 50 at the inlet, connected with a fifth isolation door 51 at the outlet and provided with a bypass door 52, and a sixth isolation door 53 at the inlet of the deaerator.
Further, the outlet pipe 4 and the condensate header 14 are respectively provided with regulating valves 5, 6 and 54.
Preferably, in the present embodiment, the upstream and downstream of the regulator valves 5, 6, and 54 are provided with a front shutoff gate 61 and a rear shutoff gate 62, respectively, and the regulator valves 5, 6, and 54 are bypass-connected with a bypass gate 63. Thus, when the regulating valves 5, 6 and 54 are damaged, the front shutoff door 61 and the rear shutoff door 62 connected with the regulating valves can be closed, and the bypass door 63 connected with the regulating valves can be opened in a bypass mode, so that the system cannot be influenced, and the damaged regulating valves can be conveniently replaced.
Further, a pressure measuring point 64 and a temperature measuring point 65 are respectively arranged on the low-temperature-section warm water mixing main pipe 23, the medium-temperature-section warm water mixing main pipe 24 and the high-temperature-section warm water mixing main pipe 25.
Further, the low-pressure inner cylinder inner cavity temperature measuring point 38, the low-pressure inner cylinder wall temperature measuring point 39 and the temperature measuring point 65 are selected from one or more of thermal resistors, thermocouples and in-situ metal thermometers.
By monitoring the temperature value of a chamber temperature measuring point 38 in the low-pressure inner cylinder and a temperature value of a wall temperature measuring point 39 of the low-pressure inner cylinder, adjusting the water quantity of a working medium through a plurality of adjusting valves 55, 56, 57, 58, 59 and 60, the purpose of gradually cooling or heating the outer walls of the low-temperature section, the middle-temperature section and the high-temperature section of the low-pressure cylinder is realized to the greatest extent and uniformly, the wall temperature of each section of the low-pressure cylinder is adjusted and kept, the temperature difference between the inner wall and the outer wall of the low-pressure inner cylinder is eliminated, the wall temperature of the low-pressure inner cylinder is ensured to be close to the temperature of a rotor, the expansion difference of the low-pressure cylinder is eliminated, the problems of large deformation, opening of a joint surface, breakage of a cylinder body reinforcing rib and the like caused by the large wall temperature difference are solved, the forced cooling water cooling brings heat generated by blowing loss of movable blades under, the problems of friction heating and over-temperature of the secondary-final-stage movable blades and the final-stage movable blades, expansion difference and over-limit of the low-pressure cylinder, reduction of dynamic and static gaps caused by aggravation of deformation, friction vibration and the like are solved, cooling steam and the investment of a water spraying temperature reduction system of the cooling steam which are required by the low-pressure cylinder cutting technology after condensate back extraction transformation or low-pressure cylinder zero-force transformation can be cut off finally, the problem of blade water erosion can be greatly improved, and the steam turbine water impact risk caused by the investment of the water spraying temperature reduction system is effectively avoided. The problem that the operation safety of the unit is seriously endangered is solved, further, the design and the manufacture are optimized, the efficiency of the low-pressure cylinder for lifting the axial through-flow gap of the low-pressure cylinder is reduced, and the safety and the economical efficiency of the operation of the low-pressure cylinder are improved.
To sum up, the utility model provides an eliminate temperature control system of low-pressure cylinder differential expansion, deformation draws to connect and corresponds temperature working medium water and cools off or heats low-pressure inner cylinder outer wall segmentation for solve the full operating mode scope including congealing and taking out back of the body, zero power, three kinds of low-pressure jar excision techniques of zero admission transformation, low-pressure inner cylinder inner and outer wall difference in temperature is big, differential expansion is big, the deflection is big, faying face opening, cylinder body strengthening rib fracture and low-load and even three kinds of low-pressure jar excision operating mode movable vane blast loss friction heat rises, secondary stage, last movable vane overtemperature, differential expansion transfinite, the dynamic and static clearance diminishes and bumps the problem of rubbing vibration etc. and endangers the safety, realize cutting off congealing and taking out the back of the body or low-pressure jar and exert oneself the input of essential cooling steam and water spray temperature reduction system, stop the water spray temperature reduction and lead to steam turbine water impact and aggravation blade water, The high-efficiency low-pressure cylinder with the smaller axial through-flow gap is manufactured, and the operation safety and the economical efficiency of the unit are improved. Specially, adopt the technical scheme of the utility model afterwards, can implement optimal design, make the high efficiency low pressure jar that has less axial through-flow clearance, predict and promote low pressure jar efficiency at least 5%, will promote the competitiveness of steam turbine manufacturing industry greatly.
In this embodiment, the preferred internal temperature of the low-pressure internal cylinder is high and low, and the low-pressure internal cylinder is divided into three sections along the axial direction, that is, a low-temperature section, a medium-temperature section and a high-temperature section, and if the factors of fine control, investment, system complexity and the like are considered, the control can be performed in four sections, even in five sections, six sections or two sections, and the like. Meanwhile, according to the operating condition of the low-pressure cylinder and the temperature of the cylinder wall, local segmented independent heating or cooling can be implemented to achieve the purposes of adjusting and controlling the wall temperature of the low-pressure cylinder and the expansion difference and deformation of the low-pressure cylinder, and the details are not repeated.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. The utility model provides an eliminate temperature control system that low pressure jar expands poor, warp, a serial communication port, temperature control system includes, demineralized water tank (1), inlet pipeline (2), demineralized water pump (3), outlet pipeline (4), first demineralized water governing valve (5), second demineralized water governing valve (6), female pipe of demineralized water (7), first demineralized water branch pipe (8), second demineralized water branch pipe (9), third demineralized water branch pipe (10), condenser (11), first condensate pipe (12), condensate booster pump (13), condensate regulating valve (54), female pipe of condensate (14), second condensate pipe (15), third condensate pipe (16), fourth condensate pipe (17), fifth condensate pipe (18), sixth condensate pipe (19), low pressure water feed pipe (20), female pipe of low temperature section temperature mixing water (23), female pipe of medium temperature mixing water (24), A high-temperature section mixed warm water main pipe (25),
the import and the export of desalination water pump (3) are connected respectively to inlet tube (2) and outlet tube (4), first condensate pipe (12) and condensate booster pump (13) access connection, second condensate pipe (15) are connected in low temperature section shaft seal heater upper reaches, third condensate pipe (16) and No. three low exit linkage that adds of moderate temperature section, fourth condensate pipe (17) and No. four low exit linkage that adds, fifth condensate pipe (18) and No. four low exit linkage that adds, sixth condensate pipe (19) and No. four low exit linkage that adds, the oxygen-eliminating device is connected to low pressure feed pipe (20),
the temperature control system further comprises a reverse-rotation side low-temperature section mixed temperature water pipe (26), a forward-rotation side low-temperature section mixed temperature water pipe (27), a reverse-rotation side middle-temperature section mixed temperature water pipe (28), a forward-rotation side middle-temperature section mixed temperature water pipe (29), a reverse-rotation side high-temperature section mixed temperature water pipe (30), a forward-rotation side high-temperature section mixed temperature water pipe (31) and a plurality of adjusting valves (55, 56, 57, 58, 59 and 60) arranged on the forward-rotation side high-temperature section mixed temperature water pipe.
2. The temperature control system according to claim 1, wherein a front shutoff gate (61) and a rear shutoff gate (62) are provided respectively upstream and downstream of the plurality of regulating valves (55, 56, 57, 58, 59, 60), and a bypass gate (63) is connected by bypass to the plurality of regulating valves (55, 56, 57, 58, 59, 60).
3. The temperature control system according to claim 1, wherein the downstream pipelines of the plurality of regulating valves (55, 56, 57, 58, 59, 60) are respectively connected with a reverse-rotation side upper cylinder temperature mixing water pipe (32), a reverse-rotation side upper cylinder temperature mixing water annular pipe (33), a reverse-rotation side lower cylinder temperature mixing water pipe (34), a reverse-rotation side lower cylinder temperature mixing water annular pipe (35), a plurality of water nozzles (36) symmetrically arranged on the upper and lower outer cylinders of the low-pressure inner cylinder, the low-pressure inner cylinder (37), a low-pressure inner cylinder inner chamber temperature measuring point (38) and a low-pressure inner cylinder wall temperature measuring point (39).
4. The temperature control system according to claim 1, wherein a first isolation valve (21) and a first check valve (22) are connected to the first branch demineralized water pipe (8), the second branch demineralized water pipe (9), the third branch demineralized water pipe (10), the second condensate pipe (15), the third condensate pipe (16), the fifth condensate pipe (18), the sixth condensate pipe (19) and the low-pressure water supply pipe (20), respectively.
5. The temperature control system according to claim 1, characterized in that the demineralized water pump (3), the condensate booster pump (13) and the feed water pump (46) are connected with a second isolation gate (47) at the inlet and with a third isolation gate (48) and a second non-return gate (49) at the outlet.
6. The temperature control system according to claim 1, wherein the condensate header (14) is connected with a shaft seal heater (40), a first low pressure heater (41), a second low pressure heater (42), a third low pressure heater (43), a fourth low pressure heater (44) and a deaerator (45).
7. The temperature control system according to claim 6, wherein the shaft seal heater (40), the first low pressure heater (41), the second low pressure heater (42), the third low pressure heater (43) and the fourth low pressure heater (44) are connected with a fourth isolation door (50) at the inlet and a fifth isolation door (51) at the outlet, a bypass door (52) is arranged, and a sixth isolation door (53) is connected with the deaerator inlet.
8. The temperature control system according to claim 1, wherein the outlet pipe (4) and the condensate header pipe (14) are respectively provided with a first demineralized water regulating valve (5), a second demineralized water regulating valve (6) and a condensate regulating valve (54), and the upstream and downstream of the first demineralized water regulating valve (5), the second demineralized water regulating valve (6) and the condensate regulating valve (54) are respectively provided with a front shutoff door (61) and a rear shutoff door (62), and are connected with a bypass door (63) in a bypass manner.
9. The temperature control system according to claim 1, wherein the low-temperature-section mixed warm water main pipe (23), the medium-temperature-section mixed warm water main pipe (24) and the high-temperature-section mixed warm water main pipe (25) are respectively provided with a pressure measuring point (64) and a temperature measuring point (65).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920297748.0U CN209892275U (en) | 2019-03-08 | 2019-03-08 | Temperature control system for eliminating expansion difference and deformation of low-pressure cylinder |
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| CN201920297748.0U CN209892275U (en) | 2019-03-08 | 2019-03-08 | Temperature control system for eliminating expansion difference and deformation of low-pressure cylinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736904A (en) * | 2019-03-08 | 2019-05-10 | 张黎明 | It is a kind of to eliminate low pressure (LP) cylinder swollen poor, deformation temperature control system and method |
| CN115013084A (en) * | 2022-04-20 | 2022-09-06 | 华北电力科学研究院有限责任公司 | Coal burner unit monitoring method and device based on low-pressure cylinder zero output |
-
2019
- 2019-03-08 CN CN201920297748.0U patent/CN209892275U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736904A (en) * | 2019-03-08 | 2019-05-10 | 张黎明 | It is a kind of to eliminate low pressure (LP) cylinder swollen poor, deformation temperature control system and method |
| CN109736904B (en) * | 2019-03-08 | 2024-02-27 | 张黎明 | Temperature control system and method for eliminating expansion difference and deformation of low-pressure cylinder |
| CN115013084A (en) * | 2022-04-20 | 2022-09-06 | 华北电力科学研究院有限责任公司 | Coal burner unit monitoring method and device based on low-pressure cylinder zero output |
| CN115013084B (en) * | 2022-04-20 | 2024-01-26 | 华北电力科学研究院有限责任公司 | Low-pressure cylinder zero-output-based coal-fired unit monitoring method and device |
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