CN215523249U - Low-temperature economizer system - Google Patents
Low-temperature economizer system Download PDFInfo
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- CN215523249U CN215523249U CN202120563743.5U CN202120563743U CN215523249U CN 215523249 U CN215523249 U CN 215523249U CN 202120563743 U CN202120563743 U CN 202120563743U CN 215523249 U CN215523249 U CN 215523249U
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Abstract
The utility model discloses a low-temperature economizer system which comprises a low-temperature economizer, a first low-pressure heater, a second low-pressure heater and a third low-pressure heater, wherein the first low-pressure heater, the second low-pressure heater and the third low-pressure heater are sequentially connected, the low-temperature economizer and the second low-pressure heater are arranged in parallel, a water inlet valve and a water inlet regulating valve are arranged at a water inlet of the low-temperature economizer, a water outlet valve is arranged at a water outlet of the low-temperature economizer, a water injection valve is arranged in parallel with the water outlet valve, a safety valve is further arranged at a water outlet of the low-temperature economizer, and meanwhile, the low-temperature economizer is provided with an emptying valve. The utility model achieves the purpose of safe and stable operation under the starting, normal operation, shutdown and accident states of the low-temperature economizer, improves the operation flexibility of the low-temperature economizer in the prior art, solves the problems of difficult operation and difficult shutdown of the low-temperature economizer during the normal operation of the unit, reduces the safety problem of the low-temperature economizer to the operation of the unit under the accident state, and has high practical value.
Description
Technical Field
The utility model relates to the technical field of thermal power generating units, in particular to a low-temperature economizer system.
Background
At present, the exhaust gas temperature of a coal-fired power plant boiler is generally 120-140 ℃, and in some power plants burning high-sulfur coal and lignite, the exhaust gas temperature is higher and even can reach 160 ℃. This has a very adverse effect on the boiler efficiency and the safe operation of the equipment for desulfurization, dust removal, etc. The low-temperature economizer is additionally arranged, so that the exhaust gas temperature of the boiler can be effectively reduced. A low-temperature economizer is additionally arranged in a flue at the tail part of the boiler to heat the condensed water of the unit by using the waste heat of the flue gas, thereby having important significance for reducing the exhaust gas temperature of the boiler.
However, in the actual operation process, the low-temperature economizer is always heated by flue gas in a flue, so that the operation flexibility is not as good as that of a low-pressure heater, and the problems of difficult operation and outage exist in starting, outage and maintenance. For example, when the low-temperature economizer is shut down in the unit operation, the overpressure problem of the low-temperature economizer is easy to occur; the low-temperature economizer is put into use after being overhauled, the problem of pipeline vibration caused by large temperature difference of water and pipe wall is easy to occur, and meanwhile, the pressure of the low-temperature economizer is increased too fast, so that the normal operation of a main condensation water pipeline is influenced, and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide a low-temperature economizer system with a reasonable structural design.
The technical scheme adopted by the utility model for solving the problems is as follows: the utility model provides a low temperature economizer system, includes low temperature economizer, a low pressure feed water heater, No. two low pressure feed water heaters and No. three low pressure feed water heaters, characterized by, a low pressure feed water heater, No. two low pressure feed water heaters, No. three low pressure feed water heaters connect gradually, low temperature economizer and No. two low pressure feed water heaters are parallelly connected to be arranged, water intaking valve and the adjusting valve of intaking are installed to the water inlet of low temperature economizer, the outlet valve is installed to the delivery port of low temperature economizer, the water injection valve is parallelly connected to be installed to the outlet valve, the relief valve is still installed to the delivery port of low temperature economizer, and low temperature economizer is provided with the exhaust-valve simultaneously.
Compared with the prior art, the utility model has the following advantages and effects: the utility model achieves the purpose of safe and stable operation under the starting, normal operation, shutdown and accident states of the low-temperature economizer, improves the operation flexibility of the low-temperature economizer in the prior art, solves the problems of difficult operation and difficult shutdown of the low-temperature economizer during the normal operation of the unit, reduces the safety problem of the low-temperature economizer to the operation of the unit under the accident state, and has high practical value.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: the system comprises a low-temperature economizer 1, a water inlet valve 2, a water inlet adjusting valve 3, a water outlet valve 4, a water injection valve 5, a safety valve 6, an exhaust valve 7, a first low-pressure heater 8, a second low-pressure heater 9, a third low-pressure heater 10 and a main condensation water pipeline 11.
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 to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, in this embodiment, a low-temperature economizer system includes a low-temperature economizer 1, a first low-pressure heater 8, a second low-pressure heater 9, and a third low-pressure heater 10, where the first low-pressure heater 8, the second low-pressure heater 9, and the third low-pressure heater 10 are connected in sequence, the low-temperature economizer 1 and the second low-pressure heater 9 are arranged in parallel, a water inlet valve 2 and a water inlet regulating valve 3 are installed at a water inlet of the low-temperature economizer 1, a water outlet valve 4 is installed at a water outlet of the low-temperature economizer 1, a water injection valve 5 is installed in parallel on the water outlet valve 4, a safety valve 6 is further installed at a water outlet of the low-temperature economizer 1, and the low-temperature economizer 1 is provided with an exhaust valve 7.
When the low-temperature economizer 1 runs normally or is started randomly, the water inlet valve 2 is opened, the water inlet adjusting valve 3 is opened, the water outlet valve 4 is opened, the water injection valve 5 is closed, and the emptying valve 7 is closed.
When the low-temperature economizer 1 is shut down or overhauled, the water inlet valve 2 is closed, the water inlet adjusting valve 3 is closed, the water outlet valve 4 is closed, the water injection valve 5 is closed, and the emptying valve 7 is opened.
When the unit normally operates and is started after the low-temperature economizer 1 is overhauled, if the smoke exhaust temperature of the unit is close to the water outlet temperature of the first low-pressure heater 8, the water injection mode of the low-temperature economizer 1 adopts the opening of the water inlet valve 2, the opening of the water inlet adjusting valve 3, the closing of the water outlet valve 4, the closing of the water injection valve 5 and the opening of the emptying valve 7. If the unit exhaust gas temperature is close to the water outlet temperature of the second low-pressure heater 9, the water injection mode of the low-temperature economizer 1 adopts the water inlet valve 2 to be closed, the water inlet adjusting valve 3 to be closed, the water outlet valve 4 to be closed, the water injection valve 5 to be opened and the emptying valve 7 to be opened.
When the low-temperature economizer 1 fails or the internal pressure fluctuates greatly in the process of putting into service or stopping operation, the safety valve 6 can protect the low-temperature economizer 1 from overpressure.
The second low-pressure heater 9 may be one low-pressure heater or may be composed of a plurality of low-pressure heaters connected in series.
The water flow direction of the main condensation water pipeline 11 is as follows in sequence: a first low-pressure heater 8, a second low-pressure heater 9 and a third low-pressure heater 10.
Those not described in detail in this specification are well within the skill of the art.
In addition, it should be noted that the above contents described in the present specification are only illustrations of the structures of the present invention. All equivalent variations of the structures, features and principles described in accordance with the present inventive concepts are included within the scope of the present invention. Those skilled in the art to which the utility model relates will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the utility model as disclosed in the accompanying claims.
Claims (2)
1. The utility model provides a low temperature economizer system, includes low temperature economizer (1), low pressure heater (8), No. two low pressure heater (9) and No. three low pressure heater (10), characterized by, low pressure heater (8), No. two low pressure heater (9), No. three low pressure heater (10) connect gradually, low temperature economizer (1) and No. two low pressure heater (9) are parallelly connected to be arranged, water inlet valve (2) and water inlet regulating valve (3) are installed to the water inlet of low temperature economizer (1), outlet valve (4) are installed to the delivery port of low temperature economizer (1), outlet valve (4) parallel mounting has water injection valve (5), low temperature economizer (1) are provided with blowoff valve (7).
2. The low-temperature economizer system as claimed in claim 1, wherein the water outlet of the low-temperature economizer (1) is further provided with a safety valve (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120563743.5U CN215523249U (en) | 2021-03-19 | 2021-03-19 | Low-temperature economizer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120563743.5U CN215523249U (en) | 2021-03-19 | 2021-03-19 | Low-temperature economizer system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215523249U true CN215523249U (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120563743.5U Active CN215523249U (en) | 2021-03-19 | 2021-03-19 | Low-temperature economizer system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215523249U (en) |
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2021
- 2021-03-19 CN CN202120563743.5U patent/CN215523249U/en active Active
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