CN111396145A - Sludge drying coupling power generation system with steam energy gradient utilization and working method thereof - Google Patents
Sludge drying coupling power generation system with steam energy gradient utilization and working method thereof Download PDFInfo
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- CN111396145A CN111396145A CN202010318371.XA CN202010318371A CN111396145A CN 111396145 A CN111396145 A CN 111396145A CN 202010318371 A CN202010318371 A CN 202010318371A CN 111396145 A CN111396145 A CN 111396145A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a sludge drying coupling power generation system by steam energy gradient utilization and a working method thereof, wherein each steam extraction port on an extraction type steam turbine unit is communicated with the inlet of a main pipe, the outlet of the main pipe is divided into two paths, one path is communicated with the inlet of a steam turbine through a steam turbine steam flow regulating valve, the other path is communicated with one end of a steam turbine bypass, the outlet of the steam turbine is communicated with the other end of the steam turbine bypass and the inlet of a pressure reducing desuperheater, a bypass steam flow regulating valve is arranged on the steam turbine bypass, the outlet of the pressure reducing desuperheater is divided into two paths after passing through a steam indirect drier and a drain box, one path is communicated with the inlet of the pressure reducing desuperheater through the temperature reducing water regulating valve, the other path is communicated with an external unit thermodynamic system, the steam turbine is connected with a generator, the system and the method, the economical efficiency is better.
Description
Technical Field
The invention belongs to the field of sludge treatment, and relates to a sludge drying coupling power generation system by steam energy gradient utilization and a working method thereof.
Background
Along with the development and progress of society, the discharge of urban sewage and industrial sewage is continuously increased, the total amount of sludge treated by sewage treatment plants is also continuously increased, and the sludge treatment situation is very severe. Meanwhile, in the face of increasingly strict environmental protection situation, sludge treatment requires realization of reduction, stabilization, harmlessness and recycling of sludge. Among the existing sludge treatment technologies, the sludge incineration technology has the advantages of volume reduction, high weight reduction rate, high treatment speed, thorough pathogenic bacteria removal, energy recycling and the like, and is widely applied at present.
The capacity proportion of the coal burner assembling machine in China is about 60%, and by carrying out sludge drying coupling power generation on the coal burner unit, the consumption proportion of non-fossil energy and the replacement proportion of fossil energy can be improved, and the platform advantage of clean and efficient centralized treatment of coal and electricity pollutants can be played. Because the water content of the municipal sludge is about 80 percent, the direct doped combustion of the wet sludge faces a series of problems of coal bunker blockage and the like, and the doped combustion of the dried sludge has little influence on the efficiency of a pulverizing system, a combustion system and a boiler of the existing coal-fired boiler, the smooth mixing of the sludge can be realized only by reducing the water content of the sludge to be below 40 percent. The steam indirect drying is one of sludge drying technologies adopted when the sludge is mixed and burned in the existing coal-fired power plant. In order to meet the normal operation of a steam indirect drying system, high-quality steam extracted from a unit is generally used for a steam indirect drying machine to dry sludge after being subjected to temperature and pressure reduction, the traditional temperature and pressure reduction is realized through a temperature and pressure reducing device, a throttling mode and the like, and the traditional methods can cause energy waste. How to improve the energy utilization efficiency of the steam drying system and the economical efficiency of the system operation is an important problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sludge drying coupling power generation system with steam energy gradient utilization and a working method thereof.
In order to achieve the aim, the steam energy gradient utilization sludge drying coupling power generation system and the working method thereof comprise an extraction steam turbine set, a main pipe, a generator, a steam turbine steam flow regulating valve, a steam turbine bypass, a pressure and temperature reducer, a bypass steam flow regulating valve, a temperature reducing water regulating valve, a steam indirect dryer and a drain tank;
each steam extraction port on the extraction type steam turbine unit is communicated with the inlet of the main pipe, the outlet of the main pipe is divided into two paths, wherein one path is communicated with the inlet of the steam turbine through a steam turbine steam flow regulating valve, the other path is communicated with one end of a steam turbine bypass, the outlet of the steam turbine is communicated with the other end of the steam turbine bypass and the inlet of the pressure reduction desuperheater, a bypass steam flow regulating valve is arranged on the steam turbine bypass, the outlet of the pressure reduction desuperheater is divided into two paths after passing through a steam indirect drier and a drain box, one path is communicated with the inlet of the pressure reduction desuperheater through the temperature reduction water regulating valve, the other path is communicated with an external unit thermodynamic system.
The outlet of the pressure-reducing desuperheater is divided into two paths after passing through the steam indirect drier, the drain tank and the circulating pump.
Temperature and pressure detection systems are arranged on the main pipe, the pipeline between the main pipe and the steam extraction port of the steam extraction type steam turbine unit and the pipeline between the pressure reducing and temperature reducing device and the steam indirect drying machine.
A control valve is arranged on a pipeline between the main pipe and a steam extraction port of the steam extraction type steam turbine unit.
And adjusting the opening degrees of the steam flow regulating valve of the steam turbine and the bypass steam flow regulating valve, and performing primary adjustment on steam parameters.
The opening of the desuperheating water regulating valve is adjusted, the desuperheating water flow at the inlet of the pressure-reducing desuperheater is regulated, and the steam parameters are secondarily regulated.
The working method of the sludge drying coupling power generation system by utilizing steam energy gradient comprises the following steps:
obtaining steam parameters required by the indirect steam drying machine according to the actual load of the indirect steam drying machine, and calculating steam parameters of a steam main pipe required when a steam flow regulating valve of a steam turbine is closed and a bypass steam flow regulating valve is opened; selecting a steam extraction port according to steam parameters of each steam extraction port of the current steam extraction type steam turbine set so as to avoid influence of load fluctuation of the set on the steam extraction parameters, wherein the steam pressure of the selected steam extraction port is 10-20% higher than the pressure of a mother pipe;
adjusting the opening degrees of a steam flow regulating valve of a steam turbine and a bypass steam flow regulating valve according to the temperature and the pressure of steam in a main pipe and at the inlet of a steam indirect dryer, further adjusting the steam flow in the inlet of the steam turbine and the bypass of the steam turbine, reducing the temperature and the pressure of the steam through the steam turbine, realizing one-time adjustment of the steam parameter side, and driving a generator to generate electricity by the steam turbine;
the steam after primary adjustment enters a pressure reducing and temperature reducing device, the opening degree of a temperature reducing and temperature regulating valve is adjusted according to the steam temperature and pressure at the inlet of the steam indirect drying machine, and the steam is secondarily regulated to meet the normal production of the steam indirect drying machine;
the drainage generated by the steam indirect dryer is discharged into a drainage box, the water output by the drainage box is divided into two paths, one path of water enters an external unit thermodynamic system, and the other path of water enters a pressure-reducing desuperheater as desuperheater water.
The invention has the following beneficial effects:
the sludge drying coupling power generation system with steam energy gradient utilization and the working method thereof select the steam extraction port during specific operation, and reduce the extraction of high-grade steam when the normal production of the steam indirect dryer is met, thereby reducing the influence of the steam extraction on the heat efficiency of the steam extraction type steam turbine set; the steam turbine system is used for adjusting steam parameters, the production is met, meanwhile, the utilization efficiency of energy is improved, the electricity consumption of a drying center is reduced, the steam energy is utilized in a stepped mode, the utilization efficiency of the energy is effectively improved, the economy is good, and meanwhile, energy conservation and emission reduction are promoted.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a steam turbine, 2 is a generator, 3 is a pressure reducing and temperature reducing device, 4 is a steam indirect dryer, 5 is a drain tank, 6 is a circulating pump, 7 is a temperature reducing water regulating valve, 8 is a steam flow regulating valve of the steam turbine, and 9 is a bypass steam flow regulating valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the steam energy gradient utilization sludge drying coupling power generation system and the working method thereof of the present invention include an extraction steam turbine set, a main pipe, a generator 2, a steam turbine steam flow regulating valve 8, a steam turbine 1, a steam turbine bypass, a pressure reduction desuperheater 3, a bypass steam flow regulating valve 9, a desuperheating water regulating valve 7, a steam indirect dryer 4 and a steam trap 5; each steam extraction port on the steam extraction type steam turbine unit is communicated with the inlet of the main pipe, the outlet of the main pipe is divided into two paths, wherein one path is communicated with the inlet of the steam turbine 1 through a steam turbine steam flow regulating valve 8, the other path is communicated with one end of a steam turbine bypass, the outlet of the steam turbine 1 and the other end of the steam turbine bypass are communicated with the inlet of the pressure reduction desuperheater 3, a bypass steam flow regulating valve 9 is arranged on the steam turbine bypass, the outlet of the pressure reduction desuperheater 3 is divided into two paths after passing through a steam indirect drier 4, a drain box 5 and a circulating pump 6, one path is communicated with the inlet of the pressure reduction desuperheater 3 through a desuperheater regulating valve 7, the other path is communicated with an external unit thermodynamic.
Temperature and pressure detection systems are arranged on the main pipe, the pipeline between the main pipe and the steam extraction port of the steam extraction type steam turbine unit and the pipeline between the pressure reducing and temperature reducing device 3 and the steam indirect dryer 4; a control valve is arranged on a pipeline between the main pipe and a steam extraction port of the steam extraction type steam turbine unit.
Adjusting the opening degrees of the steam flow regulating valve 8 of the steam turbine and the bypass steam flow regulating valve 9, and performing primary adjustment on steam parameters; the steam parameters are secondarily adjusted by adjusting the opening of the desuperheating water adjusting valve 7 and adjusting the desuperheating water flow at the inlet of the pressure-reducing desuperheater 3.
The working method of the sludge drying coupling power generation system by utilizing steam energy gradient comprises the following steps:
obtaining steam parameters required by the indirect steam drier 4 according to the actual load of the indirect steam drier 4, and calculating steam parameters of a steam main pipe required when the steam flow regulating valve 8 of the steam turbine is closed and the bypass steam flow regulating valve 9 is opened; selecting a steam extraction port according to steam parameters of each steam extraction port of the current steam extraction type steam turbine set so as to avoid influence of load fluctuation of the set on the steam extraction parameters, wherein the steam pressure of the selected steam extraction port is 10-20% higher than the pressure of a mother pipe;
according to the temperature and the pressure of the steam in the main pipe and at the inlet of the indirect steam drying machine 4, the opening degrees of a steam flow regulating valve 8 of the steam turbine and a bypass steam flow regulating valve 9 are adjusted, so that the steam flow in the inlet of the steam turbine 1 and the bypass of the steam turbine is further adjusted, the steam is subjected to temperature reduction and pressure reduction through the steam turbine 1, the steam parameter side is adjusted at one time, and the steam turbine 1 drives a generator 2 to generate electricity;
the once adjusted steam enters the pressure reducing and temperature reducing device 3, the opening degree of the temperature reducing water adjusting valve 7 is adjusted according to the steam temperature and the steam pressure at the inlet of the steam indirect drying machine 4, and the steam is secondarily adjusted to meet the normal production of the steam indirect drying machine 4.
The drainage generated by the steam indirect dryer 4 is discharged into a drainage box 5, the moisture output by the drainage box 5 is divided into two paths, one path enters an external unit thermodynamic system, and the other path enters the pressure-reducing desuperheater 3 as desuperheater water.
Under normal operation, steam is extracted through the selected steam extraction port, and when the load of the steam indirect drying machine 4 changes or the load of a unit changes, the extracted steam is not matched with the steam parameters required by the steam indirect drying machine 4, and then the steam extraction port is selected again.
Claims (7)
1. A sludge drying coupling power generation system utilizing steam energy in a gradient manner is characterized by comprising an extraction steam turbine set, a main pipe, a power generator (2), a steam turbine steam flow regulating valve (8), a steam turbine (1), a steam turbine bypass, a pressure and temperature reducing device (3), a bypass steam flow regulating valve (9), a temperature reducing water regulating valve (7), a steam indirect drying machine (4) and a drain tank (5);
each steam extraction port on the steam extraction type steam turbine unit is communicated with an inlet of a main pipe, an outlet of the main pipe is divided into two paths, one path is communicated with an inlet of a steam turbine (1) through a steam turbine steam flow regulating valve (8), the other path is communicated with one end of a steam turbine bypass, an outlet of the steam turbine (1) is communicated with the other end of the steam turbine bypass and an inlet of a pressure reduction desuperheater (3), a bypass steam flow regulating valve (9) is arranged on the steam turbine bypass, an outlet of the pressure reduction desuperheater (3) is divided into two paths after passing through a steam indirect drier (4) and a drain box (5), one path is communicated with an inlet of the pressure reduction desuperheater (3) through a temperature reduction water regulating valve (7), the other path is communicated with an external unit thermodynamic system, and the steam turbine (1) is.
2. The system for generating power by coupling sludge drying through steam energy gradient utilization according to claim 1, wherein the outlet of the pressure reduction and temperature reduction device (3) is divided into two paths through the steam indirect drying machine (4), the drain tank (5) and the circulating pump (6).
3. The system for generating power by coupling sludge drying through steam energy gradient utilization according to claim 1, wherein temperature and pressure detection systems are arranged on the main pipe, the pipeline between the main pipe and the steam extraction port of the steam extraction type steam turbine unit and the pipeline between the pressure reduction attemperator (3) and the steam indirect dryer (4).
4. The steam energy cascade utilization sludge drying coupled power generation system as claimed in claim 3, wherein a control valve is arranged in a pipeline between the main pipe and a steam extraction port of the steam extraction steam turbine set.
5. The system for generating power by coupling sludge drying through steam energy gradient utilization according to claim 1, wherein the steam parameters are adjusted once by adjusting the opening degree of the steam flow regulating valve (8) of the steam turbine and the opening degree of the bypass steam flow regulating valve (9).
6. The system for generating power by coupling sludge drying through steam energy gradient utilization according to claim 1, characterized in that the steam parameters are secondarily adjusted by adjusting the opening degree of the temperature-reducing water adjusting valve (7) to adjust the flow rate of the temperature-reducing water at the inlet of the pressure-reducing and temperature-reducing device (3).
7. The working method of the steam energy cascade utilization sludge drying coupling power generation system as claimed in claim 4, characterized by comprising the following steps:
obtaining steam parameters required by the indirect steam drying machine (4) according to the actual load of the indirect steam drying machine (4), and calculating steam parameters of a steam main pipe required when the steam flow regulating valve (8) of the steam turbine is closed and the bypass steam flow regulating valve (9) is opened; selecting a steam extraction port according to steam parameters of each steam extraction port of the current steam extraction type steam turbine set so as to avoid influence of load fluctuation of the set on the steam extraction parameters, wherein the steam pressure of the selected steam extraction port is 10-20% higher than the pressure of a mother pipe;
according to the temperature and the pressure of steam in the main pipe and at the inlet of the steam indirect dryer (4), the opening degrees of a steam flow regulating valve (8) of the steam turbine and a bypass steam flow regulating valve (9) are regulated, so that the steam flow in the inlet of the steam turbine (1) and the bypass of the steam turbine is regulated, the steam is subjected to temperature reduction and pressure reduction through the steam turbine (1), the steam parameter side is regulated for the first time, and the steam turbine (1) drives a generator (2) to generate electricity;
the once adjusted steam enters a pressure reducing and temperature reducing device (3), the opening degree of a temperature reducing water adjusting valve (7) is adjusted according to the steam temperature and pressure at the inlet of the indirect steam drying machine (4), and the steam is secondarily adjusted to meet the normal production of the indirect steam drying machine (4);
the water generated by the steam indirect dryer (4) is drained into a water drainage box (5), the water output by the water drainage box (5) is divided into two paths, one path enters an external unit thermodynamic system, and the other path enters a pressure-reducing desuperheater (3) as desuperheating water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010318371.XA CN111396145A (en) | 2020-04-21 | 2020-04-21 | Sludge drying coupling power generation system with steam energy gradient utilization and working method thereof |
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| CN202010318371.XA CN111396145A (en) | 2020-04-21 | 2020-04-21 | Sludge drying coupling power generation system with steam energy gradient utilization and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282867A (en) * | 2020-10-15 | 2021-01-29 | 华能重庆珞璜发电有限责任公司 | Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine |
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2020
- 2020-04-21 CN CN202010318371.XA patent/CN111396145A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282867A (en) * | 2020-10-15 | 2021-01-29 | 华能重庆珞璜发电有限责任公司 | Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine |
| CN112282867B (en) * | 2020-10-15 | 2023-06-27 | 华能重庆珞璜发电有限责任公司 | Method for solving problem of vibration of EH oil pipeline caused by primary frequency modulation of steam turbine |
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