CN217004429U - System for recovering wet water of boiler for industrial steam supply - Google Patents
System for recovering wet water of boiler for industrial steam supply Download PDFInfo
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- CN217004429U CN217004429U CN202121409846.2U CN202121409846U CN217004429U CN 217004429 U CN217004429 U CN 217004429U CN 202121409846 U CN202121409846 U CN 202121409846U CN 217004429 U CN217004429 U CN 217004429U
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Abstract
The utility model discloses a system for recovering boiler wet water for industrial steam supply, which is provided with a flash tank and an electric heater, wherein high-energy saturated water generated in the wet operation of a boiler is flashed into saturated steam under the pressure of industrial steam supply, the temperature is raised to the temperature of the industrial steam supply, and the saturated steam is finally supplied to the outside, so that the recovery of working media and energy of the wet water is realized, and the operation economy of a unit is greatly improved. Meanwhile, the utility model has the advantages of small transformation range, low cost, short investment recovery period and feasibility in finance.
Description
Technical Field
The utility model belongs to the field of cogeneration of heat and power for a coal-fired power generating unit, and particularly relates to a system for recovering wet water of a boiler for industrial steam supply.
Background
With the rapid development of clean, low-carbon and renewable energy sources such as solar energy, wind energy and hydroenergy, the traditional thermal power is rapidly converted from main power generation energy sources to guarantee energy sources, and a large thermal power generating unit needs to undertake the deep peak regulation task of a power grid urgently. With the transformation and upgrade of industry and the improvement of people's living standard, the heat demand of industrial steam, central heating and the like is rapidly increased. In the field of industrial steam supply, in order to meet the normal operation of steam-using enterprises, the industrial steam supply parameters are required to be continuous, stable and reliable, and when a unit operates under low load, main equipment and auxiliary equipment are seriously deviated from the design working condition, so that the reliability of a combined heat and power system is difficult to ensure. Therefore, the contradiction between the deep peak regulation requirement and the steam supply capacity guarantee of the thermal power generating unit is increasingly prominent.
When the load of a large thermal power generating unit is deeply peaked to be less than about 30 percent BMCR, the heat in the hearth can not fully heat the feed water entering the water-cooled wall into saturated steam, and the boiler is converted into wet operation. After a steam-water mixture from the water wall system enters the separator, steam and water are separated by centrifugal force generated by rotation, the separated steam is led out from the top of the separator to the low-temperature superheater, and water enters the water storage tank from the bottom of the separator. When the water quality is qualified, nearly saturated water in the water storage tank is discharged into the condenser, so that a large amount of energy loss is caused; when the water quality is unqualified, the nearly saturated water in the water storage tank is discharged out of the factory through a sewage discharge system, so that a large amount of working medium loss and energy loss are caused.
Because the water collected in the water storage tank during the wet operation of the boiler is nearly saturated water under the water supply pressure, the energy quality is high, and the water is very necessary to be recycled. Therefore, under the conditions of long-term low-load operation of a thermal power generating unit and difficulty in maintaining steam supply quality, a method for recovering wet water of a boiler for high-pressure industrial steam supply is provided.
Disclosure of Invention
The utility model aims to solve the problem that the economical performance of low-load operation of a unit is poor due to the fact that the existing thermal power generating unit is subjected to deep peak load regulation to low load and the wet water separated by a steam-water separator cannot be effectively utilized when a boiler operates in a wet state, and meanwhile, the contradiction between long-term low-load operation of the unit and the difficulty in guaranteeing the quality of industrial steam supply is relieved.
In order to achieve the purpose, the utility model comprises a steam-water separator, a water storage tank, a flash tank and an electric heater;
the inlet of the steam-water separator is connected with the steam-water mixture of the water wall system, the saturated water outlet of the steam-water separator is connected with the water storage tank, the water storage tank is connected with the flash tank, and the saturated steam outlet of the flash tank is connected with the electric heater.
And a saturated steam outlet of the steam-water separator is connected with the low-temperature superheater.
And a saturated water outlet of the flash tank is connected with a condenser.
A stop valve is arranged on a connecting pipeline between the water storage tank and the flash tank.
An electric adjusting valve is arranged on a connecting pipeline between the water storage tank and the flash tank.
The electric heater is used for heating the saturated steam generated by the flash tank to the industrial steam supply temperature and supplying the saturated steam to the outside.
Compared with the prior art, the utility model is provided with the flash tank and the electric heater, firstly, high-energy saturated water generated in wet operation of the boiler is flashed into saturated steam under industrial steam supply pressure, the temperature is raised to the industrial steam supply temperature, and finally, the saturated steam is supplied to the outside, thereby realizing the recovery of working media and energy of the wet water and greatly improving the operation economy of the unit. Meanwhile, the utility model has the advantages of small transformation range, low cost, short investment recovery period and feasible finance.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
the system comprises a steam-water separator 1, a water storage tank 2, a stop valve 3, an electric adjusting valve 4, a flash tank 5, an electric heater 6, a condenser 7 and a steam condenser.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Referring to fig. 1, the utility model comprises a steam-water separator 1, a water storage tank 2, a flash tank 5 and an electric heater 6;
an inlet of the steam-water separator 1 is connected with a steam-water mixture of the water wall system, a saturated water outlet of the steam-water separator 1 is connected with the water storage tank 2, and a saturated steam outlet of the steam-water separator 1 is connected with the low-temperature superheater. The water storage tank 2 is connected with the flash tank 5, and a stop valve 3 and an electric adjusting valve 4 are arranged on a connecting pipeline of the water storage tank 2 and the flash tank 5. The saturated steam outlet of the flash tank 5 is connected to an electric heater 6. A saturated water outlet of the flash tank 5 is connected with a condenser 7. The electric heater 6 is used for heating the saturated steam generated by the flash tank to the industrial steam supply temperature and supplying the saturated steam to the outside.
The working method of the utility model comprises the following steps:
when the unit operates in a wet state, steam-water mixture from a water wall system enters a steam-water separator 1 to generate saturated wet water under a certain amount of water supply pressure, and the saturated wet water is collected in a water storage tank 2; saturated steam separated by the steam-water separator 1 enters the low-temperature superheater.
Saturated wet water in the water storage tank 2 enters a flash tank 5 through an outlet pipeline;
the flash tank 5 produces saturated water and saturated steam under the required industrial steam supply pressure after flash evaporation, and the saturated steam enters the electric heater 6. Saturated water produced after flash evaporation of the flash tank 5 is discharged into a condenser 7.
The saturated steam is heated to the industrial steam supply temperature in the electric heater 6 and is supplied to the outside.
Example (b):
the 1000MW unit turbine of a certain power plant is an N1000-25/600/600 type, ultra-supercritical, single-shaft, four-cylinder, four-steam-exhaust, once-intermediate-reheating and condensing turbine manufactured by the east turbine company Limited, and needs to bear industrial steam supply parameters of 2.5MPa and 320 ℃.
When the boiler is operated under the 20 percent THA load in a wet state, the generating power of a unit is 205.2MW, and high-energy saturated water (the pressure is 13.6MPa, and the temperature is 334.4 ℃) of about 120t/h is generated. Utilize this utility model to reform transform the back, set up flash tank and electric heater, flash tank design pressure is 2.5MPa, and the saturated steam pressure after the flash distillation is 2.5MPa, and the temperature is 224 ℃, and the flow is 39.1 t/h. Heated by an electric heater and further heated to 320 ℃ and then supplied out.
After the unit is transformed and recovered by the method, the heat consumption rate of the unit is about 8817.6kJ/kWh (the reduced coal consumption rate is about 330.3g/kWh) when the unit is in wet operation under the working condition of 25% THA, and is reduced by about 513.2kJ/kWh (the reduced coal consumption rate is about 19.3g/kWh) and 5.5% compared with the heat consumption rate of the unit before transformation, which is 9330.8kJ/kWh (the reduced coal consumption rate is about 349.6g/kWh), so that the operation economy of the unit is greatly improved.
Claims (6)
1. A system for recovering wet water of a boiler for industrial steam supply is characterized by comprising a steam-water separator (1), a water storage tank (2), a flash tank (5) and an electric heater (6);
the inlet of the steam-water separator (1) is connected with a steam-water mixture of a water wall system, the saturated water outlet of the steam-water separator (1) is connected with the water storage tank (2), the water storage tank (2) is connected with the flash tank (5), and the saturated steam outlet of the flash tank (5) is connected with the electric heater (6).
2. A system for recovering wet water of a boiler for industrial steam supply according to claim 1, characterized in that the saturated steam outlet of the steam-water separator (1) is connected with a low-temperature superheater.
3. A system for recovering boiler wet water for industrial steam supply according to claim 1, characterized in that the saturated water outlet of the flash tank (5) is connected to a condenser (7).
4. A system for recovering boiler wet water for industrial steam supply according to claim 1, characterized in that a stop valve (3) is arranged on the connection pipeline between the water storage tank (2) and the flash tank (5).
5. A system for recovering boiler wet water for industrial steam supply according to claim 1, characterized in that an electric regulating valve (4) is arranged on the connection pipeline between the water storage tank (2) and the flash tank (5).
6. A system for recovering wet water of a boiler for industrial steam supply according to claim 1, characterized in that the electric heater (6) is used for heating the saturated steam generated by the flash tank (5) to the industrial steam supply temperature and supplying the saturated steam to the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121409846.2U CN217004429U (en) | 2021-06-23 | 2021-06-23 | System for recovering wet water of boiler for industrial steam supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121409846.2U CN217004429U (en) | 2021-06-23 | 2021-06-23 | System for recovering wet water of boiler for industrial steam supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217004429U true CN217004429U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121409846.2U Active CN217004429U (en) | 2021-06-23 | 2021-06-23 | System for recovering wet water of boiler for industrial steam supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217004429U (en) |
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2021
- 2021-06-23 CN CN202121409846.2U patent/CN217004429U/en active Active
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