CN217001993U - Circulating water structure after back pressure unit is changed to condenser unit based on condenser is useful - Google Patents
Circulating water structure after back pressure unit is changed to condenser unit based on condenser is useful Download PDFInfo
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- CN217001993U CN217001993U CN202220700357.0U CN202220700357U CN217001993U CN 217001993 U CN217001993 U CN 217001993U CN 202220700357 U CN202220700357 U CN 202220700357U CN 217001993 U CN217001993 U CN 217001993U
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Abstract
The utility model provides a circulating water structure after a condenser unit is changed into a back pressure unit based on condenser waste, which can meet the circulating water quantity requirements of the unit under the starting and stopping working conditions and the normal working conditions. The isolation baffle is arranged between the low-pressure cylinder of the steam turbine and the condenser, and the isolation baffle isolates the low-pressure cylinder of the steam turbine from the condenser; the circulating water system comprises a cooling tower, a circulating water pump, a circulating water main pipe, a main circulating water pipeline, an auxiliary machine circulating water pipeline and an isolation valve; the water outlet of the cooling tower is connected with a circulating water main pipe; one end of the main circulating water pipeline is connected with a circulating water main pipe, and the other end of the main circulating water pipeline is connected with a water inlet of the condenser; one end of the auxiliary machine circulating water pipeline is connected with the circulating water main pipe, and the other end of the auxiliary machine circulating water pipeline is connected with a water inlet of a whole plant auxiliary machine; isolation valves are arranged on the main circulating water pipeline and the auxiliary machine circulating water pipeline; the circulating water pumps are arranged on the circulating water main pipe, and at least two circulating water pumps are arranged in parallel.
Description
Technical Field
The utility model relates to a circulating water structure of a condenser unit with a back pressure unit based on condenser waste utilization.
Background
The method has the advantages that the spirit of 'the idea of completely, accurately and comprehensively implementing the idea of completely and comprehensively implementing carbon peak-reaching carbon neutralization work by the common central State Council' is implemented, the energy consumption of the coal-electricity unit is further reduced, the flexibility and the adjusting capability are improved, the clean and high-efficiency level is improved, the clean low-carbon transformation of the power industry is promoted, and the national carbon peak-reaching and carbon neutralization assisting targets are realized on schedule.
For a coal-electricity unit with the power supply coal consumption of more than 300 g of standard coal/kilowatt hour, the energy-saving modification should be implemented by accelerating the creation condition, and the modification scale is not less than 3.5 hundred million kilowatts in the fourteen-five period. The existing coal-fired generator set is encouraged to replace heat supply, and the condenser set with the conditions is promoted to be transformed into a backpressure unit.
In modern large-scale power plants, condensers are an important component of condensing turbines. The condenser is mainly used for establishing and maintaining a certain vacuum degree (back pressure) at a steam exhaust port of the steam turbine, condensing the steam exhaust of the steam turbine into water, reducing the loss of a cold source and improving the heat efficiency of a unit.
After the condenser unit changes the backpressure unit, the condenser can be used for two purposes: firstly, the starting and stopping mode of a backpressure unit is the same as that of the original condenser unit, a turbine bypass participates in the starting and stopping of the unit, and the operation mode of a condenser under the starting and stopping working conditions is the same as that before modification; and the water replenishing tank can be used as a water replenishing tank of the backpressure unit to participate in water replenishing of a unit system. When the backpressure unit is started and stopped, the operation mode of the backpressure unit is the same as that of the original condenser unit, and circulating cooling water needs to be introduced into the condenser to cool steam discharged into the condenser by a bypass system under the starting and stopping conditions, so that the operation safety of the unit is ensured; when the backpressure unit is in a normal working condition, no steam basically enters the condenser, and circulating cooling water does not need to be introduced into the condenser or only a small amount of circulating cooling water is needed. Therefore, after the condenser unit is changed into the back pressure unit, the fluctuation of the circulating water volume of the whole plant is large aiming at the start-stop working condition and the normal working condition, and the circulating water volume requirement of the unit under the start-stop working condition and the normal working condition is difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, provides a circulating water structure after a condenser unit is changed into a back pressure unit based on condenser waste, and has reasonable structural design, and can meet the requirements of circulating water quantity of the unit under the starting and stopping working conditions and the normal working conditions.
The technical scheme adopted by the utility model for solving the problems is as follows: a circulating water structure of a condenser unit based on condenser waste after a back pressure unit is changed comprises a steam turbine low-pressure cylinder, a condenser, a whole plant auxiliary machine and a circulating water system; the method is characterized in that: also comprises an isolation baffle; the isolation baffle is arranged between the turbine low-pressure cylinder and the condenser, and the isolation baffle separates the turbine low-pressure cylinder from the condenser; the circulating water system comprises a cooling tower, a circulating water pump, a circulating water main pipe, a main circulating water pipeline, an auxiliary machine circulating water pipeline and an isolation valve; the water outlet of the cooling tower is connected with a circulating water main pipe; one end of the main circulating water pipeline is connected with a circulating water main pipe, and the other end of the main circulating water pipeline is connected with a water inlet of the condenser; one end of the auxiliary machine circulating water pipeline is connected with the circulating water main pipe, and the other end of the auxiliary machine circulating water pipeline is connected with a water inlet of a whole plant auxiliary machine; isolation valves are arranged on the main circulating water pipeline and the auxiliary machine circulating water pipeline; the circulating water pumps are arranged on the circulating water main pipe, and at least two circulating water pumps are arranged in parallel.
The isolating valve is a butterfly valve.
The utility model also comprises a steam turbine bypass system, wherein the steam turbine bypass system comprises a steam turbine bypass, a steam turbine bypass steam inlet pipeline and a steam turbine bypass steam exhaust pipeline; the steam turbine bypass steam inlet pipeline is connected with the steam turbine bypass, the steam turbine bypass is connected with the steam turbine bypass steam exhaust pipeline, and the steam turbine bypass steam exhaust pipeline is connected with the condenser.
The total supply capacity of the circulating water pump is the total circulating water demand of the whole plant under the start-stop working condition of the unit, and the single supply capacity of the circulating water pump is the circulating water demand of the auxiliary engine of the whole plant under the normal working condition of the unit.
Compared with the prior art, the utility model has the following advantages and effects: the circulating water system is reasonable in configuration, can meet the requirements of the circulating water quantity of the unit under the start-stop working condition and the normal working condition, and has high economical efficiency and safety.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
The embodiment of the utility model comprises a steam turbine low pressure cylinder 1, a condenser 2, an isolation baffle 7, a whole plant auxiliary machine 8, a circulating water system and a steam turbine bypass system.
The turbine bypass system includes a turbine bypass 6, a turbine bypass inlet line 104, and a turbine bypass exhaust line 105. The turbine bypass steam inlet line 104 is connected to the turbine bypass 6, the turbine bypass 6 is connected to the turbine bypass steam exhaust line 105, and the turbine bypass steam exhaust line 105 is connected to the condenser 2.
After the condenser unit changes the back pressure unit, set up division baffle 7 between steam turbine low pressure cylinder 1 and condenser 2, cut off steam turbine low pressure cylinder 1 and condenser 2 through division baffle 7, then condenser 2 no longer with steam turbine low pressure cylinder 1 UNICOM, condenser 2 independent operation, condenser 2 of condenser unit before can utilizing old transformation, condenser 2 need not to demolish, saves the unit and reforms transform the cost. When the backpressure unit is started and stopped, the operation mode of the backpressure unit is the same as that of the original steam turbine unit, the steam turbine bypass system participates in the starting and stopping of the unit, and circulating cooling water needs to be introduced into the steam condenser 2 to cool steam discharged into the steam condenser 2 by the bypass system under the starting and stopping conditions, so that the unit is ensured to operate safely; when the backpressure unit is in a normal working condition, no steam basically enters the condenser 2, and circulating cooling water does not need to be introduced into the condenser 2 or only a small amount of circulating cooling water is needed. Therefore, after the condenser unit is changed into the back pressure unit, the fluctuation of the circulating water volume of the whole plant is large according to the starting and stopping working conditions and the normal working conditions.
The circulating water system comprises a cooling tower 4, a circulating water pump 5, a circulating water main pipe 101, a main circulating water pipeline 102, an auxiliary machine circulating water pipeline 103 and an isolation valve 3.
The water outlet of the cooling tower 4 is connected with a circulating water main pipe 101.
One end of the main circulating water pipeline 102 is connected with the circulating water main pipe 101, and the other end is connected with the water inlet of the condenser 2. One end of the auxiliary machine circulating water pipeline 103 is connected with the circulating water main pipe 101, and the other end is connected with a water inlet of the whole plant auxiliary machine 8.
The main circulating water pipeline 102 and the auxiliary circulating water pipeline 103 are both provided with isolating valves 3, and the form of the isolating valves can be selected from butterfly valves and used for isolating circulating water on the pipelines and regulating flow.
The circulating water pumps 5 are arranged on the circulating water main pipe 101, and at least two circulating water pumps 5 are arranged in parallel. The specific configuration principle of the circulating water pump is as follows: the total supply capacity of the circulating water pump 5 is the total circulating water demand of the whole plant under the start-stop working condition of the unit; the supply capacity of each circulating water pump 5 is the requirement of the circulating water of the auxiliary machines of the whole plant under the normal working condition of the unit. In a specific project case, the circulating water quantity requirement of the condenser under the start-stop working condition of the unit is 5000m 3/h; the circulating water demand of the auxiliary machines of the whole plant of the unit is 2000m 3/h. Two circulating water pumps 5 are arranged, the rated working condition flow of a single circulating water pump is 2500m3/h, and the maximum working condition flow is 3500m 3/h. In the case, when the unit is started or stopped, the total plant circulating water quantity requirement is the sum of the condenser circulating water quantity and the total plant auxiliary machine circulating water quantity, 7000m3/h, at the moment, the two circulating water pumps 5 operate simultaneously, and the maximum working condition can meet the total plant circulating water quantity requirement; when the unit is in a normal working condition, the requirement of the circulating water quantity of the whole plant is the sum of the small circulating water quantity of the condenser and the circulating water quantity of the auxiliary machines of the whole plant, and in the range of 2000-2500m3/h, at the moment, a single circulating water pump 5 operates, and the requirement of the circulating water quantity of the whole plant can be met under the rated working condition. The start-stop working condition of the unit is short in time and less in frequency, and at least two circulating water pumps 5 operate at the maximum working condition simultaneously, so that the circulating water quantity requirement of the whole plant can be ensured; the normal operating mode time of unit is longer, and single circulating water pump 5 moves, and its rated operating mode can satisfy the circulating water volume demand of whole factory, and circulating water pump operating efficiency is higher this moment, and energy-conserving economy, and two at least circulating water pump's configuration sets up as required and uses and reserve, guarantees unit operation security.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the utility model are included in the protection scope of the patent.
Claims (4)
1. A circulating water structure after a condenser unit is changed into a back pressure unit based on condenser waste comprises a steam turbine low-pressure cylinder, a condenser, a whole plant auxiliary machine and a circulating water system; the method is characterized in that: also comprises an isolation baffle; the isolation baffle is arranged between the turbine low pressure cylinder and the condenser, and the isolation baffle separates the turbine low pressure cylinder from the condenser; the circulating water system comprises a cooling tower, a circulating water pump, a circulating water main pipe, a main circulating water pipeline, an auxiliary machine circulating water pipeline and an isolation valve; the water outlet of the cooling tower is connected with a circulating water main pipe; one end of the main circulating water pipeline is connected with a circulating water main pipe, and the other end of the main circulating water pipeline is connected with a water inlet of the condenser; one end of the auxiliary machine circulating water pipeline is connected with the circulating water main pipe, and the other end of the auxiliary machine circulating water pipeline is connected with a water inlet of a whole plant auxiliary machine; isolation valves are arranged on the main circulating water pipeline and the auxiliary machine circulating water pipeline; the circulating water pumps are arranged on the circulating water main pipe, and at least two circulating water pumps are arranged in parallel.
2. The condenser unit based on condenser is made of metal and is changed circulation water structure behind back pressure unit according to claim 1, characterized in that: the isolating valve is a butterfly valve.
3. The condenser unit based on condenser is made of metal and is changed circulation water structure behind back pressure unit according to claim 1, characterized in that: the system also comprises a steam turbine bypass system, wherein the steam turbine bypass system comprises a steam turbine bypass, a steam turbine bypass steam inlet pipeline and a steam turbine bypass steam exhaust pipeline; the steam turbine bypass inlet pipeline is connected with the steam turbine bypass, the steam turbine bypass is connected with the steam turbine bypass exhaust pipeline, and the steam turbine bypass exhaust pipeline is connected with the condenser.
4. The condenser unit based on condenser is made of metal and is changed circulation water structure behind back pressure unit according to claim 1, characterized in that: the total supply capacity of the circulating water pump is the total circulating water demand of the whole plant under the start-stop working condition of the unit, and the single supply capacity of the circulating water pump is the circulating water demand of the auxiliary machines of the whole plant under the normal working condition of the unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220700357.0U CN217001993U (en) | 2022-03-29 | 2022-03-29 | Circulating water structure after back pressure unit is changed to condenser unit based on condenser is useful |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220700357.0U CN217001993U (en) | 2022-03-29 | 2022-03-29 | Circulating water structure after back pressure unit is changed to condenser unit based on condenser is useful |
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| Publication Number | Publication Date |
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| CN217001993U true CN217001993U (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220700357.0U Active CN217001993U (en) | 2022-03-29 | 2022-03-29 | Circulating water structure after back pressure unit is changed to condenser unit based on condenser is useful |
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| Country | Link |
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| CN (1) | CN217001993U (en) |
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2022
- 2022-03-29 CN CN202220700357.0U patent/CN217001993U/en active Active
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