CN113236377B - A steam turbine for coke dry quenching waste heat power generation - Google Patents

Abstract

The invention discloses a steam turbine for coke CDQ waste heat power generation, which relates to the technical field of steam turbines, including a steam turbine, a bearing installed on the rotating shaft of the steam turbine, a thermostat, a lubricating oil monitoring system, a thermostat, a filter, and a thermostat. A fuel tank, a second fuel tank, a first oil pump, and a second oil pump. Intelligently identify the temperature and viscosity of the lubricating oil in the bearing oil chamber, which effectively solves the problem that the lubricating oil has high viscosity and difficult to form an oil film due to the low temperature when the steam turbine is just started, and improves the lubricating effect of the lubricating oil on the bearing. Heating without adding other heating systems reduces the manufacturing cost, the cooling water at the condenser cools down the lubricating oil, fully utilizes the energy in the CDQ waste heat power generation system, and realizes lubricating oil that must be replaced for impurities Switching with new lubricating oil improves the production efficiency and the service life of the bearing, and does not require manual monitoring and identification at all times, saving labor.

Description

A steam turbine for coke dry quenching waste heat power generation

technical field

The invention relates to the technical field of steam turbines, in particular to a steam turbine for coke dry quenching waste heat power generation.

Background technique

CDQ waste heat power generation is a coke quenching method that uses inert gas to cool red coke in an oxygen-free environment. During the CDQ process, red coke is loaded from the top of the CDQ furnace, and the low-temperature inert gas is circulated The blower blows into the red coke layer in the cooling section of the CDQ furnace, and the cooled coke is discharged from the bottom of the CDQ furnace; the inert circulating gas whose temperature rises after absorbing the latent heat of red coke is discharged from the ring flue of the CDQ furnace, and enters the CDQ The waste heat boiler performs heat exchange, and the steam generated by the boiler enters the steam turbine to drive the generator to generate electricity.

Steam enters the steam turbine through nozzles and moving blades to make the rotating shaft rotate at high speed. The rotating shaft is supported by multiple sets of bearings and installed on the casing of the steam turbine. When the rotating shaft rotates, a large amount of heat and friction will be generated, and these heat and friction need to be used Lubricating oil is used to lubricate and reduce heat, so as to reduce friction and temperature and improve the service life of bearings.

Generally speaking, the viscosity of lubricating oil decreases with the increase of temperature. Lubricating oil forms a thin oil film between friction pairs to play a lubricating role. When selecting lubricating oil, it is based on the working state of the equipment (the working temperature of the bearing) ) is selected, once the temperature is exceeded, the viscosity will drop, the stiffness of the oil film will decrease, which will affect the lubrication of the equipment, and at the same time, the lubricating oil will accelerate oxidation and generate sludge, etc.; if the temperature is too low, the viscosity will increase, the viscosity will be high, and the oil film will be difficult to form. The effect will decrease.

For example, the publication number is that CN107013266B discloses a steam turbine bearing box oil supply device, which is composed of a power cord, a power switch, a lead, a switch, an oil pipe, an oil pump, an oil tank, lubricating oil, a filter screen, a cooler, an accumulator, a liquid Pump, coolant, liquid pool, heat loss device, temperature control switch, overflow valve, oil inlet pipe, oil return pipe, bearing box, bearing box is equipped with oil inlet pipe, oil return pipe, oil inlet pipe passes through overflow device, heat loss device, The accumulator and oil pump are connected to the oil tank; the oil return pipe is connected to the oil tank, and the lubricating oil is circulated between the bearing box and the oil tank under the action of the oil pump, and the bearing The lubricating oil in the box item is always kept within the set temperature and pressure range.

The above-mentioned oil supply device can cool down the lubricating oil when the shaft rotates at high speed, but when the steam turbine is initially started, the temperature of the lubricating oil at the bearing position is in a low temperature state. At this time, the viscosity of the lubricating oil is high, and the oil film is difficult to form. The lubrication effect of the bearing will decrease, the life of the bearing will be greatly reduced, and the new cooling equipment in the bearing hydraulic system will increase the manufacturing cost, and the energy in the CDQ waste heat power generation system cannot be well utilized, resulting in a waste of part of the energy. Therefore, this application provides A steam turbine for coke CDQ waste heat power generation was developed to meet the demand.

Contents of the invention

The purpose of this application is to provide a steam turbine for CDQ waste heat power generation, which can intelligently identify the temperature and viscosity of the lubricating oil in the bearing oil chamber, effectively solving the problem of high viscosity and difficult oil film due to the low temperature of the lubricating oil when the steam turbine is just started. Form a problem, improve the lubricating effect of the lubricating oil on the bearing, and heat it through steam, without adding other heating systems, which reduces the manufacturing cost, and cools the lubricating oil through the cooling water at the condenser, making full use of CDQ The energy in the waste heat power generation system realizes the switching between the lubricating oil that must be replaced and the new lubricating oil when there are many impurities. On the one hand, it improves the production efficiency and the service life of the bearing. On the other hand, it does not need manual monitoring and identification at all times, saving Labor volume.

In order to achieve the above purpose, this application provides the following technical solutions: a steam turbine for coke CDQ waste heat power generation, including a steam turbine, a bearing installed on the shaft of the steam turbine, a thermostat, a lubricating oil monitoring system, a filter, a first Oil tank, second oil tank, first oil pump, second oil pump;

The steam input end of the steam turbine is connected to the CDQ waste heat boiler through a steam injection pipe, the steam discharge end of the steam turbine is connected to the condenser through a steam discharge pipe, and the CDQ waste heat boiler and the condenser are connected through a circulation pipe Connected to the circulating water system;

The first oil tank is connected to the first oil pump through a first oil injection pipe, and the first oil injection pipe is fixedly connected with a first section of oil injection main pipe, and one end of the first section of oil injection main pipe is fixedly connected with a thermostat, The second oil tank is connected to the second oil pump through a second oil injection pipe, one end of the second oil injection pipe is fixedly connected to the first oil injection main pipe, and the thermostat and the bearing oil chamber are connected through a second oil injection pipe. section oil injection main pipe, the filter and the bearing oil chamber are connected through the first section oil return main pipe, the oil outlet end of the filter is fixedly connected with the second section oil return main pipe, and the second section return One end of the oil main pipe is fixedly connected with an oil return branch pipe and an oil return side branch pipe through a tee, one end of the oil return branch pipe is fixedly connected to the first oil tank, and one end of the oil return side branch pipe is fixedly connected to the second oil return pipe. On the second fuel tank;

The steam injection pipe is connected with the thermostat through a steam branch pipe, the steam discharge pipe is connected with the thermostat through a steam return pipe, and the cold water end of the condenser is connected with the thermostat through a cooling water injection pipe, The circulation pipe communicates with the thermostat through a cooling water return pipe;

The lubricating oil monitoring system is used to monitor whether the temperature and viscosity of the hydraulic oil in the oil chamber are within the normal working setting value of the bearing when the bearing is working. When the temperature exceeds the normal working setting value, the thermostat is used to lubricate The oil returns to the normal work set value, and when the viscosity exceeds the set value, the second oil tank and the second oil pump are used to inject new lubricating oil into the lubricating oil cavity of the bearing.

Preferably, the lubricating oil monitoring system includes a temperature sensor and a viscometer, the temperature sensor is used to monitor the current temperature in the bearing oil cavity, and the viscometer is used to monitor the lubricating oil in the bearing oil cavity viscosity;

When T1≤T≤T2, it is judged whether Δη is greater than Δη1, wherein, the T is the current temperature of the lubricating oil in the bearing oil chamber, and the T1 and T2 are when the bearing 2 is working normally The set value of lubricating oil temperature, and T1<T2, Δη is the viscosity change value of the lubricating oil in the bearing oil chamber at present, and Δη1 is the set value of the lubricating oil viscosity change value when the bearing is in normal operation;

If Δη>Δη1, the control valve on the first oil injection pipe is closed, the control valve on the second oil injection pipe is opened, and the second oil pump pumps the new hydraulic oil in the second oil tank through the first The oil injection main pipe section and the second section oil injection main pipe are injected into the lubricating oil chamber of the bearing, and the lubricating oil with high viscosity in the lubricating oil chamber of the bearing passes through the first section oil return main pipe, the second section Section oil return main pipe, described oil return sub-pipe flows in the first oil tank;

When T>T2, the control valves on the cooling water injection pipe and the cooling water return pipe are opened, and the cold water on the condenser flows into the thermostat through the cooling water injection pipe. The lubricating oil in the thermostat cools down, and the lubricating oil after cooling flows into the oil chamber of the bearing through the second oil filling main pipe;

When T<T1, the control valves on the steam branch pipe and the steam return pipe are opened, and the steam branch pipe passes high-temperature steam into the thermostat to increase the temperature of the lubricating oil passing through the thermostat. The final lubricating oil flows into the oil cavity of the bearing through the second oil injection main pipe.

Preferably, the thermostat includes a box body, and a plurality of heat conducting plates are arranged in the box, and the same circulation oil pipe is installed on the plurality of heat conduction plates, and the two ends of the circulation oil pipe are connected to the first section respectively. The oil injection main pipe is fixedly connected with the second oil injection main pipe, and the same cooling water dispersion plate is arranged on the top of the plurality of heat conducting plates, and one end of the cooling water injection pipe is fixedly connected on the top of the cooling water dispersion plate, so that The bottom of the cooling water dispersing plate is provided with a plurality of uniformly distributed cooling water dispersing holes, one side of the plurality of heat conducting plates is provided with a steam dispersing plate, and one end of the steam branch pipe is fixedly connected to the steam dispersing plate One side of the steam distribution plate is provided with a plurality of evenly distributed steam distribution holes.

Preferably, a plurality of heat conduction holes are opened on the top and the bottom of the heat conduction plate.

Preferably, the heat conducting plate is a metal copper plate.

In sum, technical effect and advantage of the present invention:

1. The structure of the present invention is reasonable. When the steam turbine is just started, the temperature of the lubricating oil in the bearing oil chamber is low. When T<T1, the lubricating oil monitoring system recognizes and issues instructions. The control valves on the steam branch pipe and the steam return pipe Open, the steam in the steam injection pipe will fully heat the circulating oil pipe and the heat conduction plate through the steam branch pipe through the evenly distributed steam distribution holes on the steam distribution plate, so that the circulating oil pipe can be heated more evenly and quickly, so as to realize the circulation of oil The temperature of the lubricating oil in the pipe is increased, and when the temperature of the lubricating oil reaches the temperature within the normal working range of the bearing, it flows into the oil chamber of the bearing through the second section of the oil filling main pipe, which effectively solves the problem of low temperature and viscosity of the lubricating oil when the turbine is just started. High, the oil film is difficult to form problems, improves the lubricating effect of the lubricating oil on the bearing, greatly improves the service life of the bearing, and heats through steam without adding other heating systems, reduces manufacturing costs, and makes full use of dry Energy in coke quenching waste heat power generation system;

2. In the present invention, when the internal shaft of the steam turbine runs at high speed, the bearing bears a large force and generates a large amount of heat. At this time, the temperature of the lubricating oil in the bearing oil chamber rises sharply. When T>T2, the lubricating oil monitoring system recognizes and sends out command, the control valves on the cooling water injection pipe and the cooling water return pipe are opened, the cooling water at the condenser is injected into the cooling water dispersion plate through the cooling water injection pipe, and the cooling water passing through the cooling water dispersion plate is distributed evenly The water dispersion holes fully cool the circulating oil pipe and heat conduction plate, making the cooling of the circulating oil pipe more uniform and rapid. When the temperature of the lubricating oil drops to the temperature within the normal working range of the bearing, it flows into the oil chamber of the bearing through the second oil injection main pipe , effectively improving the service life of the bearing;

3. In the present invention, when T1≤T≤T2, and Δη>Δη1, the lubricating oil in the bearing oil chamber is at the normal working temperature, and the viscosity of the lubricating oil exceeds the set viscosity value, which means The reason is that the lubricating oil in the bearing oil chamber has a lot of residue and is relatively sticky. The lubricating oil in the first oil tank is always supplied to the bearing oil chamber through the first oil pump, and the lubricating oil is kept in the working state of the bearing through the thermostat. During the lubricating oil circulation process, the impurities in the lubricating oil are discharged through filtering through the filter, but the viscosity of the lubricating oil still exceeds the set viscosity value at this time, which means that the lubricating oil supplied by the first oil tank and the first oil pump has relatively low impurities. If there is too much, new lubricating oil needs to be replaced. At this time, the control valve on the second oil injection pipe is opened, and the second oil pump injects the new hydraulic oil in the second oil tank into the lubricating oil of the bearing through the first section of oil injection main pipe and the second section of oil injection main pipe. In the oil chamber, the lubricating oil with a lot of impurities is collected into the first oil tank for centralized replacement. Therefore, the viscosity of the lubricating oil can be intelligently identified without stopping the turbine, and the lubricating oil that must be replaced with a lot of impurities can be realized. Switching with new lubricating oil, on the one hand, improves the production efficiency and the service life of the bearing, on the other hand, it does not need manual monitoring and identification at all times, which saves labor.

4. In the present invention, by setting circulating oil pipes and multiple heat conduction plates, the multiple heat conduction plates are metal copper plates, which have better thermal conductivity, and multiple heat conduction plates are provided with multiple heat conduction holes, which further improves the heat conduction effect , so that it is convenient to heat or cool down the lubricating oil in the circulating oil pipe, and the heating or cooling speed is fast.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative work.

Fig. 1 is a schematic diagram of a steam turbine system for coke CDQ waste heat power generation;

Fig. 2 is a schematic diagram of a three-dimensional structure of a thermostat;

Fig. 3 is a schematic diagram of the internal three-dimensional structure of the thermostat;

FIG. 4 is a schematic diagram of the three-dimensional structure of the heat conducting fin assembly.

In the figure: 1. Steam turbine; 2. Bearing; 3. Steam injection pipe; 4. Steam discharge pipe; 5. First oil tank; 6. Second oil tank; 7. First oil pump; 8. Second oil pump; 9. No. One section of oil injection main pipe; 10. Second oil injection pipe; 11. Thermostat; 12. First oil return main pipe; 13. Oil return side pipe; 14. Oil return pipe; 15. Filter; 16. Condenser; 17 1. Cooling water injection pipe; 18. Cooling water return pipe; 19. Steam branch pipe; 20. Steam return pipe; 21. First oil injection pipe; 22. Second oil injection main pipe; 23. Cooling water dispersion plate; 24. Steam dispersion plate; 25, heat conduction plate; 26, circulating oil pipe; 27, box body.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment: Refer to a steam turbine for coke CDQ waste heat power generation shown in Figures 1-4, including a steam turbine 1, a bearing 2 installed on the rotating shaft of the steam turbine 1, and the bearing 2 is installed on the cylinder body of the steam turbine 1 through a bearing bush and a bearing seat , also including a thermostat 11, a lubricating oil monitoring system, a filter 15, a first oil tank 5, a second oil tank 6, a first oil pump 7, and a second oil pump 8;

The steam input end of the steam turbine 1 is connected to the CDQ waste heat boiler through the steam injection pipe 3, the steam discharge end of the steam turbine 1 is connected to the condenser 16 through the steam discharge pipe 4, and the CDQ waste heat boiler and the condenser 16 are connected to the circulation pipe through the circulation pipe. The water system is connected, and the steam is used to drive the rotating shaft in the steam turbine 1 to rotate, and the discharged steam is cooled by the condenser 16, and then used for water circulation;

The first oil tank 5 is connected with the first oil pump 7 through the first oil injection pipe 21. The first oil injection pipe 21 is fixedly connected with the first oil injection main pipe 9, and one end of the first oil injection main pipe 9 is fixedly connected with the thermostat 11. The second oil tank 6 and the second oil pump 8 are connected through the second oil injection pipe 10, one end of the second oil injection pipe 10 is fixedly connected to the first oil injection main pipe 9, and the thermostat 11 and the bearing 2 oil chamber pass through the second oil injection main pipe 22 The filter 15 is connected with the oil chamber of the bearing 2 through the first oil return main pipe 12, the oil outlet end of the filter 15 is fixedly connected with the second oil return main pipe, and one end of the second oil return main pipe passes through a tee An oil return branch pipe 14 and an oil return side branch pipe 13 are fixedly connected, one end of the oil return branch pipe 14 is fixedly connected to the first oil tank 5, and one end of the oil return side branch pipe 13 is fixedly connected to the second oil tank 6;

The steam injection pipe 3 communicates with the thermostat 11 through the steam branch pipe 19, the steam discharge pipe 4 communicates with the thermostat 11 through the steam return pipe 20, the cold water end of the condenser 16 communicates with the thermostat 11 through the cooling water injection pipe 17, and circulates The pipe communicates with the thermostat 11 through the cooling water return pipe 18;

The lubricating oil monitoring system is used to monitor whether the temperature and viscosity of the hydraulic oil in the oil chamber of the bearing 2 are within the normal working setting value of the bearing 2. When the temperature exceeds the normal working setting value, the thermostat 11 is used to restore the normal working of the lubricating oil Set value, when the viscosity exceeds the set value, the second oil tank 6 and the second oil pump 8 are used to inject new lubricating oil into the lubricating oil cavity of the bearing 2.

As an implementation in this embodiment, the lubricating oil monitoring system includes a temperature sensor and a viscometer, the temperature sensor is used to monitor the current temperature in the oil chamber of the bearing 2, and the viscometer is used to monitor the lubricating oil in the oil chamber of the bearing 2 viscosity;

When T1≤T≤T2, it is judged whether △η is greater than Δη1, where T is the current temperature of lubricating oil in the oil chamber of bearing 2, T1 and T2 are the set values of lubricating oil temperature when bearing 2 is working normally, and T1 <T2, Δη is the viscosity change value of the lubricating oil in the oil chamber of the bearing 2, and Δη1 is the set value of the viscosity change value of the lubricating oil when the bearing 2 is working normally;

If Δη>Δη1, the control valve on the first oil injection pipe 21 is closed, the control valve on the second oil injection pipe 10 is opened, and the second oil pump 8 passes the new hydraulic oil in the second oil tank 6 through the first oil injection main pipe 9 1. The second oil injection main pipe 22 is injected into the lubricating oil chamber of the bearing 2, and the lubricating oil with high viscosity in the lubricating oil chamber of the bearing 2 passes through the first oil return main pipe 12, the second oil return main pipe, and the oil return branch pipe 14 It flows into the first oil tank 5. What needs to be explained here is that the lubricating oil in the oil chamber of the bearing 2 is at the normal working temperature, and the viscosity of the lubricating oil exceeds the set viscosity value, which means that the lubricating oil in the oil chamber of the bearing 2 The lubricating oil has a lot of residue and is relatively sticky. The lubricating oil in the first oil tank 5 always supplies oil to the oil chamber of the bearing 2 through the first oil pump 7, and the lubricating oil maintains the temperature of the bearing 2 in working state through the thermostat 11 range, the lubricating oil is filtered through the filter 15 during the circulation process, and the impurities in the lubricating oil are discharged. At this time, the viscosity of the lubricating oil still exceeds the set viscosity value, indicating that the lubricating oil supplied by the first oil tank 5 and the first oil pump 7 There are many impurities, and new lubricating oil needs to be replaced. At this time, the control valve on the second oil injection pipe 10 is opened, and the second oil pump 8 transfers the new hydraulic oil in the second oil tank 6 through the first oil injection main pipe 9 and the second oil injection pipe. The main pipe 22 is injected into the lubricating oil chamber of the bearing 2, and the lubricating oil with a lot of impurities is collected into the first oil tank 5 for centralized replacement, so the viscosity of the lubricating oil can be intelligently identified without stopping the steam turbine 1, and Realize the switch between lubricating oil that must be replaced due to impurities and new lubricating oil. On the one hand, it improves the production efficiency and the service life of the bearing 2. On the other hand, it does not need manual monitoring and identification at all times, which saves labor;

When the internal shaft of steam turbine 1 runs at high speed, bearing 2 bears a large force and generates a lot of heat. At this time, the temperature of the lubricating oil in the oil chamber of bearing 2 rises sharply. When T>T2, the lubricating oil monitoring system recognizes and issues instructions to cool down The control valves on the water injection pipe 17 and the cooling water return pipe 18 are opened, and the cold water on the condenser 16 flows into the thermostat 11 through the cooling water injection pipe 17, cooling the lubricating oil passing through the thermostat 11, and the temperature of the lubricating oil When the temperature drops to the normal working range of the bearing 2, it flows into the oil cavity of the bearing 2 through the second oil filling main pipe 22, effectively improving the service life of the bearing 2;

When the steam turbine 1 is just started, the temperature of the lubricating oil in the oil chamber of the bearing 2 is low at this time, and when T<T1, the lubricating oil monitoring system recognizes and issues an instruction to open the control valves on the steam branch pipe 19 and the steam return pipe 20, The steam branch pipe 19 passes high-temperature steam into the thermostat 11 to increase the temperature of the lubricating oil passing through the thermostat 11. When the temperature of the lubricating oil reaches the temperature within the normal working range of the bearing 2, it flows to the bearing 2 through the second section of the oil filling main pipe 22. In the oil chamber, it effectively solves the problem that the lubricating oil is difficult to form due to low temperature, high viscosity and oil film when the steam turbine 1 is just started, improves the lubricating effect of the lubricating oil on the bearing 2, and greatly improves the service life of the bearing 2. In addition, the steam is used for heating without adding other heating systems, which reduces the manufacturing cost and fully utilizes the energy in the coke CDQ waste heat power generation system.

As an implementation in this embodiment, the thermostat 11 includes a box body 27, and a plurality of heat conduction plates 25 are arranged inside the box body 27, and the same circulation oil pipe 26 is installed on the plurality of heat conduction plates 25, and the two circulation oil pipes 26 The ends are fixedly connected with the first oil injection main pipe 9 and the second oil injection main pipe 22 respectively, and the same cooling water dispersion plate 23 is arranged on the top of multiple heat conduction plates 25, and one end of the cooling water injection pipe 17 is fixedly connected to the cooling water dispersion plate 23, the bottom of the cooling water dispersing plate 23 is provided with a plurality of evenly distributed cooling water dispersing holes, one side of the plurality of heat conducting plates 25 is provided with a steam dispersing plate 24, and one end of the steam branch pipe 19 is fixedly connected to the steam dispersing plate 24, one side of the steam distribution plate 24 is provided with a plurality of evenly distributed steam distribution holes, by setting a plurality of heat conduction plates 25, and the circulation oil pipe 26 is located on the plurality of heat conduction plates 25, and the plurality of heat conduction plates 25 Full contact, when the lubricating oil in the circulating oil pipe 26 is heated, the steam in the steam branch pipe 19 can fully heat the circulating oil pipe 26 and the heat conduction plate 25 through a plurality of evenly distributed steam distribution holes on the steam dispersing plate 24, The circulating oil pipe 26 is heated more evenly and quickly; when the lubricating oil in the circulating oil pipe 26 is cooled, the cold water in the cooling water injection pipe 17 passes through a plurality of evenly distributed cooling water dispersing holes on the cooling water dispersing plate 23 to fully Cool down the circulating oil pipe 26 and the heat conduction plate 25, so that the cooling of the circulating oil pipe 26 is more uniform and rapid.

As an implementation in this embodiment, the top and the bottom of the heat conduction plate 25 are provided with a plurality of heat conduction holes, and the heat conduction effect can be improved by setting the heat conduction holes.

As an implementation manner in this embodiment, the heat conduction plate 25 is a metal copper plate, and the metal copper plate has better thermal conductivity.

The working principle of the present invention:

When the steam turbine 1 is just started, the temperature of the lubricating oil in the oil chamber of the bearing 2 is low, and when T<T1, the lubricating oil monitoring system recognizes and issues an instruction, and the control valves on the steam branch pipe 19 and the steam return pipe 20 are opened, and the steam The steam injected into the pipe 3 fully heats the circulating oil pipe 26 and the heat conducting plate 25 through the steam branch pipe 19 through a plurality of uniformly distributed steam distribution holes on the steam dispersing plate 24, so that the circulating oil pipe 26 is heated more evenly and quickly, thereby Realize the temperature increase of the lubricating oil in the circulating oil pipe 26. When the temperature of the lubricating oil reaches the temperature within the normal working range of the bearing 2, it flows into the oil chamber of the bearing 2 through the second oil filling main pipe 22, which effectively solves the problem that the steam turbine 1 just starts. When the lubricating oil is low in temperature, high in viscosity, and difficult to form an oil film, the lubricating effect of the lubricating oil on the bearing 2 is improved, and the service life of the bearing 2 is greatly improved, and it is heated by steam without adding other heating systems. The manufacturing cost is reduced, and the energy in the CDQ waste heat power generation system is fully utilized.

When the internal shaft of steam turbine 1 runs at high speed, bearing 2 bears a large force and generates a lot of heat. At this time, the temperature of the lubricating oil in the oil chamber of bearing 2 rises sharply. When T>T2, the lubricating oil monitoring system recognizes and issues instructions to cool down The control valves on the water injection pipe 17 and the cooling water return pipe 18 are opened, and the cooling water at the condenser 16 is injected into the cooling water dispersion plate 23 through the cooling water injection pipe 17. The distributed cooling water dispersing holes fully cool the circulating oil pipe 26 and the heat conduction plate 25, so that the circulating oil pipe 26 can cool down more evenly and quickly. 22 flows into the oil chamber of the bearing 2, effectively improving the service life of the bearing 2.

When T1≤T≤T2, and △η>△η1, the lubricating oil in the bearing 2 oil chamber is at the normal working temperature, and the viscosity of the lubricating oil exceeds the set viscosity value, indicating that the bearing 2 oil chamber The lubricating oil in the lubricating oil has a lot of residue and is relatively sticky. The lubricating oil in the first oil tank 5 always supplies oil to the oil chamber of the bearing 2 through the first oil pump 7, and keeps the lubricating oil in the working state of the bearing 2 through the thermostat 11. The lubricating oil is filtered through the filter 15 during the circulation process, and the impurities in the lubricating oil are discharged, but at this time the viscosity of the lubricating oil still exceeds the set viscosity value, indicating that the oil is supplied by the first oil tank 5 and the first oil pump 7 There are many impurities in the lubricating oil, and new lubricating oil needs to be replaced. At this time, the control valve on the second oil injection pipe 10 is opened, and the second oil pump 8 passes the new hydraulic oil in the second oil tank 6 through the first oil injection main pipe 9, the second The section oil injection main pipe 22 is injected into the lubricating oil chamber of the bearing 2, and the lubricating oil with many impurities is collected into the first oil tank 5 for centralized replacement, so the viscosity of the lubricating oil can be intelligently identified without stopping the steam turbine 1 , and realize the switching between the lubricating oil that must be replaced with more impurities and the new lubricating oil. On the one hand, the production efficiency and the service life of the bearing 2 are improved. On the other hand, manual monitoring and identification is not required at all times, which saves labor.

By setting the circulating oil pipe 26 and a plurality of heat conducting plates 25, the plurality of heat conducting plates 25 are all metal copper plates, which have good thermal conductivity, and the plurality of heat conducting plates 25 are provided with a plurality of heat conduction holes, which further improves the heat conduction effect, thereby It is convenient to heat or cool down the lubricating oil in the circulating oil pipe 26, and the heating or cooling speed is fast.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some of the technical features may be replaced equivalently, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (5)

1. A steam turbine for CDQ waste heat power generation, comprising a steam turbine (1), a bearing (2) installed on the rotating shaft of the steam turbine (1), characterized in that it also includes a thermostat (11), a lubricating oil monitoring system , filter (15), the first oil tank (5), the second oil tank (6), the first oil pump (7), the second oil pump (8); the steam input end of the steam turbine (1) passes through the steam injection pipe (3 ) is connected with the CDQ waste heat boiler, the steam discharge end of the steam turbine (1) is connected with the condenser (16) through the steam discharge pipe (4), the CDQ waste heat boiler, the condenser (16) It is connected with the circulating water system through a circulation pipe; the first oil tank (5) is connected with the first oil pump (7) through a first oil injection pipe (21), and the first oil injection pipe (21) is fixedly connected with The first oil injection main pipe (9), one end of the first oil injection main pipe (9) is fixedly connected to the thermostat (11), the second oil tank (6) and the second oil pump (8) pass through the first Two oil injection pipes (10) are connected, one end of the second oil injection pipe (10) is fixedly connected to the first oil injection main pipe (9), and the thermostat (11) passes through the oil chamber of the bearing (2) The second section of oil injection main pipe (22) is connected, the filter (15) is connected with the bearing (2) oil chamber through the first section of oil return main pipe (12), and the oil outlet of the filter (15) One end of the oil return main pipe is fixedly connected with the second section of the oil return main pipe, and one end of the second section of the oil return main pipe is fixedly connected with the oil return branch pipe (14) and the oil return side branch pipe (13), and the oil return branch pipe (14) One end of the oil return side pipe (13) is fixedly connected to the second oil tank (6); the steam injection pipe (3) is connected with the The thermostat (11) is communicated through the steam branch pipe (19), the steam discharge pipe (4) is communicated with the thermostat (11) through the steam return pipe (20), and the cold water end of the condenser (16) is connected with the The thermostat (11) is connected through the cooling water injection pipe (17), the circulation pipe is connected with the thermostat (11) through the cooling water return pipe (18), the first oil injection pipe (21), the second Two oil injection pipes (10), cooling water injection pipes (17), cooling water return pipes (18), steam branch pipes (19) and steam return pipes (20) are provided with control valves; the lubricating oil monitoring system is used for Monitor whether the temperature and viscosity of the hydraulic oil in the oil chamber of the bearing (2) are within the normal working set value of the bearing (2), when the temperature exceeds the normal working set value, the thermostat (11) uses Return to the normal working set value with lubricating oil, when the viscosity exceeds the set value, the second oil tank (6) and the second oil pump (8) are used to inject new oil into the lubricating oil chamber of the bearing (2) lubricating oil. 2. A steam turbine for coke CDQ waste heat power generation according to claim 1, characterized in that: the lubricating oil monitoring system includes a temperature sensor and a viscosity measuring instrument, and the temperature sensor is used to monitor the bearing (2) The current temperature in the oil chamber, the viscometer is used to monitor the viscosity of the lubricating oil in the oil chamber of the bearing (2); when T1≤T≤T2, it is judged whether Δη is greater than Δη1, wherein the T is the temperature of the lubricating oil in the oil chamber of the bearing (2), the T1 and T2 are the set values of the lubricating oil temperature when the bearing (2) is working normally, T1<T2, Δη is the current The viscosity change value of the lubricating oil in the oil chamber of the bearing (2), Δη1 is the set value of the viscosity change value of the lubricating oil when the bearing (2) works normally; if Δη > Δη1, the first note The control valve on the oil pipe (21) is closed, the control valve on the second oil injection pipe (10) is opened, and the second oil pump (8) passes the new hydraulic oil in the second oil tank (6) through the first The section oil injection main pipe (9) and the second section oil injection main pipe (22) are injected into the lubricating oil chamber of the bearing (2), and the lubricating oil with high viscosity in the lubricating oil chamber of the bearing (2) passes through the The first oil return main pipe (12), the second oil return main pipe, and the oil return branch pipe (14) flow into the first oil tank (5); when T>T2, the cooling water injection pipe (17) and the control valve on the cooling water return pipe (18) are opened, and the cold water on the condenser (16) flows into the thermostat (11) through the cooling water injection pipe (17), Cool down the lubricating oil passing through the thermostat (11), and the lubricating oil after cooling flows into the oil chamber of the bearing (2) through the second oil filling main pipe (22); when T<T1, The control valves on the steam branch pipe (19) and the steam return pipe (20) are opened, and the steam branch pipe (19) passes high-temperature steam into the thermostat (11), and passes through the thermostat (11) The temperature of the lubricating oil inside is increased, and the lubricating oil after the temperature increase flows into the oil chamber of the bearing (2) through the second oil filling main pipe (22). 3. A steam turbine for coke CDQ waste heat power generation according to claim 1, characterized in that: said thermostat (11) comprises a box (27), and said box (27) is provided with a plurality of heat conduction plate (25), the same circulation oil pipe (26) is installed on a plurality of said heat conduction plates (25), and the two ends of said circulation oil pipe (26) are respectively connected with the first oil injection main pipe (9) and the second The section oil injection main pipe (22) is fixedly connected, the top of a plurality of said heat conduction plates (25) is provided with the same cooling water dispersing plate (23), and one end of said cooling water injection pipe (17) is fixedly connected to said cooling water On the top of the dispersing plate (23), the bottom of the cooling water dispersing plate (23) is provided with a plurality of evenly distributed cooling water dispersing holes, and one side of the plurality of heat conducting plates (25) is provided with steam dispersing holes. plate (24), one end of the steam branch pipe (19) is fixedly connected to one side of the steam distribution plate (24), and one side of the steam distribution plate (24) is provided with a plurality of evenly distributed steam distribution hole. 4. The steam turbine for coke CDQ waste heat power generation according to claim 3, characterized in that: both the top and the bottom of the heat conducting plate (25) are provided with a plurality of heat conducting holes. 5. A steam turbine for coke CDQ waste heat power generation according to claim 4, characterized in that: the heat conducting plate (25) is a metal copper plate.

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