阅读说明：本技术 一种汽轮机湿冷机组的乏汽加热系统 (Exhaust steam heating system of steam turbine wet cooling unit ) 是由 介智华 于 2021-09-09 设计创作，主要内容包括：本申请涉及湿冷机组的领域,尤其是涉及一种汽轮机湿冷机组的乏汽加热系统,其与汽轮机相连接,汽轮机包括高压缸、中压缸和低压缸,低压缸上连通有主机凝汽器,乏汽加热系统包括连接热网循环水的乏汽凝汽器、增汽机凝汽器和引射乏汽的增汽机,热网循环水依次流入乏汽凝汽器和增汽机凝汽器,低压缸与乏汽凝汽器相连通,中压缸与增汽机凝汽器相连通,增汽机分别与中压缸、低压缸和增汽机凝汽器相连通。本申请的乏汽加热系统,可以逐级对热网循环水进行加热,高效的、最大限度的利用了乏汽的热量,减少了乏汽热量的浪费,提高了经济效益。(The utility model belongs to the technical field of the wet cooling unit and specifically relates to a steam exhaust heating system of steam turbine wet cooling unit is related to, it is connected with the steam turbine, the steam turbine includes high pressure jar, intermediate pressure jar and low pressure jar, the intercommunication has the host computer condenser on the low pressure jar, steam exhaust heating system is including the steam exhaust condenser of connecting the heat supply network circulating water, the turbine condenser with draw the turbine that draws the steam exhaust, the heat supply network circulating water flows into steam exhaust condenser and turbine condenser in proper order, the low pressure jar is linked together with the steam exhaust condenser, the intermediate pressure jar is linked together with the turbine condenser, the turbine is linked together with the turbine condenser with intermediate pressure jar, low pressure jar and turbine condenser respectively. The utility model provides a steam exhaust heating system can heat the heat supply network circulating water step by step, and efficient, furthest has utilized the heat of steam exhaust, has reduced the thermal waste of steam exhaust, has improved economic benefits.)

1. The utility model provides a steam exhaust heating system of turbine wet cooling unit, it is connected with the steam turbine, the steam turbine include high pressure cylinder, intermediate pressure cylinder (1) and low pressure jar (2), low pressure jar (2) on the intercommunication have host computer condenser (3), its characterized in that: the exhaust steam heating system comprises an exhaust steam condenser (4) connected with heat supply network circulating water, a steam booster condenser (5) and a steam booster (6) for injecting exhaust steam, wherein the heat supply network circulating water sequentially flows into the exhaust steam condenser (4) and the steam booster condenser (5), a low pressure cylinder (2) is communicated with the exhaust steam condenser (4), an intermediate pressure cylinder (1) is communicated with the steam booster condenser (5), and the steam booster (6) is respectively communicated with the intermediate pressure cylinder (1), the low pressure cylinder (2) and the steam booster condenser (5).

2. The exhaust steam heating system of a steam turbine wet cooling unit according to claim 1, wherein: low pressure cylinder (2) include two low pressure blade group (21), main shaft (22) and two disk groups, low pressure blade group (21) correspond with the disk group and set up and interconnect, two disk group suit on main shaft (22), two low pressure blade group (21) are with main shaft (22) ascending mid point extension line symmetry setting of length direction, every low pressure blade group (21) including leading movable blade group (211) and time final stage movable blade group (213), time final stage movable blade group (213) tip that is close to main shaft (22), leading movable blade group (211) be located time final stage movable blade group (213) one side of keeping away from main shaft (22) tip.

3. The exhaust steam heating system of a steam turbine wet cooling unit according to claim 2, wherein: the wheel disc set comprises a plurality of wheel discs (23), each low-pressure blade set (21) further comprises a last-stage moving blade set (212), the last-stage moving blade set (212) is positioned on one side, close to the end part of the main shaft (22), of the next-to-last-stage moving blade set (213), the last-stage moving blade set (212) comprises a plurality of last-stage moving blades, the last-stage moving blades are circumferentially inserted into the edge of the wheel disc (23) corresponding to the last-stage moving blade set (212), and the length of each last-stage moving blade is 900-1280 mm.

4. The exhaust steam heating system of a steam turbine wet cooling unit according to claim 1, wherein: and one end of the steam booster condenser (5) far away from the exhaust steam condenser (4) is communicated with a heat supply system.

5. The exhaust steam heating system of a steam turbine wet cooling unit according to claim 4, wherein: the heating system is characterized by further comprising a heating network heater (7), wherein the heating network heater (7) is located on one side, away from the exhaust steam condenser (4), of the steam turbine condenser (5), and the heating network heater (7) is communicated with the intermediate pressure cylinder (1), the steam turbine condenser (5) and the heating system respectively.

6. The exhaust steam heating system of a steam turbine wet cooling unit according to claim 5, wherein: and a heat supply network circulating pump (8) is arranged between the turbine condenser (5) and the heat supply network heater (7).

7. The exhaust steam heating system of a steam turbine wet cooling unit according to claim 6, wherein: the low-pressure steam condenser is characterized in that a first pipeline (9) is arranged between the low-pressure cylinder (2) and the exhaust steam condenser (4), a second pipeline (10) perpendicular to the first pipeline (9) is arranged on the first pipeline (9), and the second pipeline (10) is communicated with the first pipeline (9) and the steam booster (6) respectively.

8. The exhaust steam heating system of a steam turbine wet cooling unit according to claim 7, wherein: and a third pipeline (20) is arranged at an air outlet of the intermediate pressure cylinder (1), and the third pipeline (20) is respectively communicated with the steam booster (6) and the heat supply network heater (7).

Technical Field

The application relates to the field of a steam turbine wet cooling unit, in particular to a steam exhaust heating system of the steam turbine wet cooling unit.

Background

With the rapid development of urban central heating, the energy-saving and environment-friendly benefits of the cogeneration units are gradually emphasized.

The heat of the low-temperature exhaust steam of the steam turbine can be recycled through circulating water, the heat supply capacity of the system can be improved by more than 20%, so that for a wet cooling unit, a steam turbine low-pressure cylinder dual-rotor exchange circulating water heat supply technology is an effective mode, but the mode is difficult to efficiently utilize the low-pressure exhaust steam heat to heat the circulating water, so that the exhaust steam heat is greatly dissipated into cooling water, the heat of the exhaust steam is wasted, the utilization rate of the exhaust steam heat is also reduced, the exhaust steam heat loss of the wet cooling unit of the thermal power plant accounts for 50% of the total input energy consumption of the system, and the economical efficiency is poor.

Disclosure of Invention

In order to improve and be difficult to the high efficiency among the relevant art and utilize low pressure exhaust steam heat to heat the circulating water to lead to the exhaust steam heat to be lost in a large number to the cooling water, not only wasted the exhaust steam heat, still reduced the utilization ratio of exhaust steam heat, problem that economic nature worsens, this application provides a steam exhaust heating system of wet cold unit of steam turbine.

The application provides a steam exhaust heating system of wet cold unit of steam turbine adopts following technical scheme:

the utility model provides a steam exhaust heating system of turbine wet cooling unit, its is connected with the steam turbine, the steam turbine include high pressure cylinder, intermediate pressure cylinder and low pressure jar, the low pressure cylinder on the intercommunication have a host computer condenser, steam exhaust heating system including the steam exhaust condenser of connecting the heat supply network circulating water, increase the turbine condenser and draw the turbine that increases of exhaust steam, the heat supply network circulating water flow in proper order steam exhaust condenser and increase the turbine condenser, low pressure cylinder and steam exhaust condenser be linked together, intermediate pressure cylinder and turbine condenser be linked together, the turbine that increases be linked together with intermediate pressure cylinder, low pressure cylinder and turbine condenser respectively.

By adopting the technical scheme, one part of the exhaust steam discharged by the low-pressure cylinder enters the main machine condenser, the other part of the exhaust steam enters the exhaust steam condenser, the exhaust steam in the exhaust steam condenser heats the circulating water of the heat supply network flowing into the exhaust steam condenser, the heated circulating water of the heat supply network enters the steam booster condenser, the steam booster takes the steam discharged by the intermediate pressure cylinder as a power source and injects the exhaust steam in the low-pressure cylinder, the two kinds of exhaust steam are mixed and then enter the steam booster condenser, the exhaust steam in the steam booster condenser heats the circulating water of the heat supply network flowing into the steam booster condenser, the exhaust steam in the exhaust steam condenser and the exhaust steam in the steam booster condenser realize the step-by-step heating of the circulating water of the heat supply network, the steam booster not only introduces the exhaust steam into the steam booster condenser, but also raises the temperature of the exhaust steam, further raises the temperature of the circulating water of the heat supply network, and the heated circulating water of the heat supply network is reused subsequently, the waste steam heat can be efficiently utilized to the maximum extent, the waste of the waste steam heat is reduced, and the economic benefit is improved.

Optionally, the low pressure cylinder includes two low pressure blade groups, main shaft and two rim plate groups, low pressure blade group and rim plate group correspond to set up and interconnect, two rim plate group suit on the main shaft, two low pressure blade groups with the ascending mid point extension line symmetry of main shaft length direction set up, every low pressure blade group including leading movable blade group and penultimate stage movable blade group, penultimate stage movable blade group be close to the tip of main shaft, leading movable blade group be located penultimate stage movable blade group and keep away from one side of main shaft tip.

By adopting the technical scheme, after the superheated steam enters the low pressure cylinder of the steam turbine, the superheated steam directly contacts the penultimate movable blade set, so that the exhaust steam back pressure is improved, the back pressure is increased, the temperature of the corresponding exhaust steam is also improved, the saturation temperature corresponding to the exhaust steam is improved, and higher heat is provided for the heating heat supply network circulating water of the subsequent exhaust steam condenser and the steam booster condenser.

Optionally, the wheel disc set includes a plurality of wheel discs, each low-pressure blade set further includes a last-stage moving blade set, the last-stage moving blade set is located on one side of the next-stage moving blade set close to the end of the main shaft, the last-stage moving blade set includes a plurality of last-stage moving blades, the last-stage moving blades are circumferentially inserted into edges of the wheel discs corresponding to the last-stage moving blade set, and the length of each last-stage moving blade is 900 plus 1280 mm.

By adopting the technical scheme, the last-stage moving blade group is added in the low-pressure cylinder, the length of each last-stage moving blade is 900-1280mm, the back pressure is improved, the temperature of the corresponding exhaust steam is also improved, and the saturation temperature corresponding to the exhaust steam is further improved.

Optionally, one end of the turbine condenser, which is far away from the exhaust steam condenser, is communicated with a heat supply system.

By adopting the technical scheme, the exhaust steam entering the steam booster condenser heats the circulating water of the heat supply network flowing into the steam booster condenser, the heated circulating water of the heat supply network enters the heat supply system to supply heat to the area needing heat supply, and the heat of the exhaust steam is fully utilized, so that the heat supply requirement is met, the loss of the heat of the exhaust steam is reduced in the heat supply period, the heat is supplied by utilizing low-quality steam, the utilization rate of the heat of the exhaust steam is improved, the resource is saved, and the cost is saved.

Optionally, the exhaust steam heating system of the turbine wet cooling unit further comprises a heat supply network heater, the heat supply network heater is located on one side, away from the exhaust steam condenser, of the steam booster condenser, and the heat supply network heater is respectively communicated with the intermediate pressure cylinder, the steam booster condenser and the heat supply system.

By adopting the technical scheme, the exhaust steam in the heat supply network heater heats the heat supply network circulating water flowing into the heat supply network heater again, so that the temperature of the heat supply network circulating water is improved, and the heat supply requirement is ensured.

Optionally, a heat supply network circulating pump is arranged between the turbine condenser and the heat supply network heater.

By adopting the technical scheme, the heating network circulating pump can circularly convey heated heating network circulating water, so that the heating network circulating water flowing into the heating network heater keeps a fixed temperature.

Optionally, a first pipeline is arranged between the low-pressure cylinder and the exhaust steam condenser, a second pipeline perpendicular to the first pipeline is arranged on the first pipeline, and the second pipeline is respectively communicated with the first pipeline and the steam booster.

Through adopting above-mentioned technical scheme, the exhaust steam is drawn through first pipeline and second pipeline to the turbo charger, can reduce the thermal loss of exhaust steam that flows to the exhaust steam condenser by the host computer condenser, avoids causing the thermal waste of exhaust steam.

Optionally, a third pipeline is arranged at an exhaust port of the intermediate pressure cylinder, and the third pipeline is respectively communicated with the steam booster and the heat supply network heater.

By adopting the technical scheme, the exhaust steam discharged by the intermediate pressure cylinder enters the steam booster and the heat supply network heater through the third pipeline, the steam booster injects the exhaust steam into the steam booster condenser, so that the exhaust steam in the steam booster condenser heats the heat supply network circulating water flowing into the steam booster condenser, and then the exhaust steam entering the heat supply network heater heats the heat supply network circulating water flowing into the heat supply network heater, thereby improving the temperature of the heat supply network circulating water.

In summary, the present application includes at least one of the following beneficial technical effects:

1. one part of the exhaust steam discharged by the low-pressure cylinder enters a main machine condenser, the other part of the exhaust steam enters an exhaust steam condenser, the exhaust steam in the exhaust steam condenser heats the circulating water of a heat supply network flowing into the exhaust steam condenser, the heated circulating water of the heat supply network enters a steam booster condenser, the steam booster uses the steam discharged by the intermediate pressure cylinder as a power source and injects the exhaust steam in the low-pressure cylinder, the two kinds of exhaust steam are mixed and then enter the steam booster condenser, the exhaust steam in the steam booster condenser heats the circulating water of the heat supply network flowing into the steam booster condenser, the exhaust steam in the exhaust steam condenser and the exhaust steam in the steam booster condenser realize the step-by-step heating of the circulating water of the heat supply network, the steam booster not only introduces the exhaust steam into the steam booster condenser, but also raises the temperature of the exhaust steam, the temperature of the circulating water of the heat supply network is further raised, and the heated circulating water of the heat supply network is subsequently recycled, so that the exhaust steam can be efficiently, The heat of the dead steam is utilized to the maximum extent, the waste of the heat of the dead steam is reduced, and the economic benefit is improved;

2. after the superheated steam enters a low-pressure cylinder of the steam turbine, the superheated steam directly contacts the penultimate movable blade group, so that the exhaust steam back pressure is improved, the back pressure is increased, the temperature of the corresponding exhaust steam is also improved, the saturation temperature corresponding to the exhaust steam is improved, and higher heat is provided for heating circulating water of a heat supply network by a subsequent exhaust steam condenser and a steam booster condenser;

3. the exhaust steam entering the steam booster condenser heats the circulating water of the heat supply network flowing into the steam booster condenser, the heated circulating water of the heat supply network enters the heat supply system to supply heat to the area needing heat supply, and the heat of the exhaust steam is fully utilized, so that the heat supply requirement is met.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a low-pressure cylinder according to the present application.

Fig. 2 is a schematic structural diagram of the present application.

Fig. 3 is a schematic structural diagram of a second embodiment of the low pressure cylinder according to the present application.

Description of reference numerals: 1. the system comprises an intermediate pressure cylinder, 2, a low pressure cylinder, 21, a low pressure blade group, 211, a front movable blade group, 212, a final movable blade group, 213, a secondary final movable blade group, 22, a main shaft, 23, a wheel disc, 3, a main machine condenser, 4, a steam exhaust condenser, 5, a steam booster condenser, 6, a steam booster, 7, a heat supply network heater, 8, a heat supply network circulating pump, 9, a first pipeline, 10, a second pipeline, 20 and a third pipeline.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

Referring to fig. 1 and 2, an exhaust steam heating system of a turbine wet cooling unit, it is connected with the turbine, the turbine includes the high pressure cylinder, intermediate pressure cylinder 1 and low pressure cylinder 2, the high pressure cylinder, intermediate pressure cylinder 1 sets up with low pressure cylinder 2 side by side, the bottom of low pressure cylinder 2 is provided with host computer condenser 3 and is linked together with host computer condenser 3, low pressure cylinder 2 includes the low pressure outer jar, two low pressure blade group 21, main shaft 22 and two wheel disc groups, main shaft 22 runs through the low pressure outer jar, two wheel disc groups and two low pressure blade group 21 all are located the low pressure outer jar, low pressure blade group 21 corresponds the setting and interconnect with the wheel disc group, two wheel disc groups suit are on main shaft 22, two wheel disc groups set up with the ascending midpoint extension line symmetry of main shaft 22 length direction, every wheel disc group includes a plurality of wheel discs 23.

The embodiment of the application discloses exhaust steam heating system of a steam turbine wet cooling unit.

Referring to fig. 2, the exhaust steam heating system of the turbine wet cooling unit comprises an exhaust steam condenser 4, a first pipeline 9 is arranged between a low pressure cylinder 2 and the exhaust steam condenser 4, the low pressure cylinder 2 is communicated with the exhaust steam condenser 4 through the first pipeline 9, the exhaust steam condenser 4 is connected with an external heat supply network circulating water pipe, the direction of the heat supply network circulating water is taken as the front, a steam booster condenser 5 is arranged in front of the exhaust steam condenser 4, a steam booster 6 is arranged on one side of the steam booster condenser 5 close to the intermediate pressure cylinder 1, a pipeline is arranged between the steam booster condenser 5 and the steam booster 6, and is communicated with the intermediate pressure cylinder 1 through a pipeline, a pipeline is also arranged between the steam booster 6 and the intermediate pressure cylinder and is communicated with the intermediate pressure cylinder through a pipeline, a second pipeline 10 is arranged between the first pipeline 9 and the steam booster 6, the second pipeline 10 is perpendicular to the first pipeline 9, and the first pipeline 9 is communicated with the steam booster 6 through the second pipeline 10.

A heat supply network circulating pump 8 and a heat supply network heater 7 are sequentially arranged in front of the turbine condenser 5, a heat supply network circulating water pipe sequentially penetrates through the turbine condenser 5, the heat supply network circulating pump 8 and the heat supply network heater 7, the heat supply network heater 7 is connected with an external heat supply system, a third pipeline 20 is arranged at an exhaust port of the intermediate pressure cylinder 1, and the third pipeline 20 is respectively communicated with the turbine 6 and the heat supply network heater 7.

The booster 6 raises the back pressure to 50KPa or more.

Referring to fig. 1, a first embodiment of the low pressure cylinder structure:

each low-pressure blade group 21 includes a leading movable blade group 211 and a penultimate movable blade group 213, the penultimate movable blade group 213 is close to one end of the main shaft 22, the leading movable blade group 211 is located on one side of the penultimate movable blade group 213 far from the end of the main shaft 22, the penultimate movable blade group 213 includes a plurality of penultimate movable blades, the leading movable blade group 211 includes four-stage regulation-stage movable blades, each stage of regulation-stage movable blades includes a plurality of regulation-stage movable blades, therefore, each low-pressure blade group 21 includes five stages of movable blades in total, each stage of regulation-stage movable blades is circumferentially inserted on the edge of the wheel disc 23 corresponding to the stage of regulation, and a plurality of penultimate movable blades are circumferentially inserted on the edge of the wheel disc 23 corresponding to the penultimate movable blade group 213.

After the superheated steam enters the low-pressure cylinder 2 of the steam turbine, the superheated steam directly contacts the penultimate movable blade group 213, so that the exhaust back pressure is improved.

The implementation principle of the steam exhaust heating system of the steam turbine wet cooling unit in the embodiment of the application is as follows: after the back pressure of the steam turbine is increased through the low-pressure blade group 21, a part of exhaust steam formed enters a main machine condenser 3, the other part enters an exhaust steam condenser 4 through a first pipeline 9, at the moment, the circulating water of a heat supply network firstly flows into the exhaust steam condenser 4, the exhaust steam in the exhaust steam condenser 4 heats the circulating water of the heat supply network, the temperature of the circulating water of the heat supply network is increased from 50 ℃ to 60 ℃, a steam booster 6 uses the steam discharged by an intermediate pressure cylinder 1 as a power source to inject the exhaust steam in the first pipeline 9, the two types of exhaust steam are mixed in the steam booster 6 and then enter the steam booster condenser 5, the circulating water of the heat supply network flowing into the steam booster condenser 5 is continuously heated, the circulating water of the heat supply network is increased from 60 ℃ to more than 70 ℃, a part of the exhaust steam in the intermediate pressure cylinder 1 enters a heat supply network heater 7, the circulating water of the heat supply network flowing out from the steam booster condenser 5 is circularly conveyed to the heat supply network heater 7 through a heat supply circulating pump 8, the exhaust steam in the heating network heater 7 heats the heating network circulating water again to enable the heating network circulating water to reach a proper temperature, and the heating network circulating water enters a heating system to supply heat to an area needing heat supply.

In the peak period of heat supply, the exhaust steam heats the circulating water of the heat supply network in the exhaust steam condenser 4, the steam booster condenser 5 and the heat supply network heater 7 respectively, so that the heat supply pressure of a heating system of the heating station is reduced, 90% of heat supply load is provided, and the peak regulation requirement is met.

Referring to fig. 3, a second embodiment of the low pressure cylinder structure is an improvement on the first embodiment of the low pressure cylinder structure.

Each low-pressure blade group 21 further comprises a last-stage moving blade group 212, the last-stage moving blade group 212 comprises a plurality of last-stage moving blades, the last-stage moving blade group 212 is positioned on one side of the next-stage moving blade group 213 close to the end part of the main shaft 22, a wheel disc 23 capable of being inserted with the plurality of last-stage moving blades is arranged on the main shaft 22 close to the end part of the main shaft, the plurality of last-stage moving blades are circumferentially inserted on the edge of the wheel disc 23, and the length of the last-stage moving blades is 900 mm.

In this embodiment, each low pressure vane row 21 includes six stages of moving vanes.

The third embodiment of the low pressure cylinder structure is an improvement on the second embodiment.

The length of the last stage moving blade is 1000 mm.

The fourth embodiment of the low pressure cylinder structure is an improvement on the second embodiment.

The length of the last stage moving blade is 1280 mm.

The length of the final-stage moving blade is adjusted according to the actually required temperature of the dead steam, the shorter the final-stage blade is, the less the low-pressure cylinder does work, and the higher the exhaust pressure of the low-pressure cylinder is, so that the temperature of the corresponding dead steam is improved, and the heating capacity of the dead steam is also improved.

If the final-stage moving blade group 212 is detached to meet the condition of the first low-pressure cylinder structure embodiment, the mounting opening of the final-stage moving blade group 212 is inserted into the wheel disc 23, the blade root baffle plate can be used for sealing the mounting opening, superheated steam cannot enter the mounting opening, and therefore the influence of the mounting opening on back pressure lifting is reduced.

By adopting the modes of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment of the low-pressure cylinder structure, the back pressure of the wet cooling unit can be increased by 3-5 times, and the back pressure is increased to more than 18KPa from 10 KPa.

Referring to fig. 1, in the first embodiment, when the final moving blade set 212 is not installed, a wheel disc 23 may be disposed on each side of the next final moving blade set 213 close to the end of the main shaft 22, so that when the final moving blade set 212 needs to be used later, it is convenient to install a plurality of final moving blades on the wheel disc 23.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.