CN219199138U - Novel wall temperature controllable system of low-pressure economizer - Google Patents
Novel wall temperature controllable system of low-pressure economizer Download PDFInfo
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- CN219199138U CN219199138U CN202223284536.XU CN202223284536U CN219199138U CN 219199138 U CN219199138 U CN 219199138U CN 202223284536 U CN202223284536 U CN 202223284536U CN 219199138 U CN219199138 U CN 219199138U
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Abstract
The utility model discloses a novel low-pressure economizer wall temperature controllable system, which is used for ensuring that the minimum inlet water temperature required by the low-pressure economizer system is not lower than a certain setting value, avoiding low-temperature corrosion of low-pressure economizer equipment due to low pipe wall temperature caused by low inlet water temperature, and affecting the safety of the whole system, and comprises the following specific scheme: the utility model provides a novel low pressure economizer wall temperature controllable system, includes low pressure economizer, be connected with inlet tube way and outlet pipe way on the low pressure economizer respectively, the outlet pipe way is connected with the recirculation water line, the other end of recirculation water line is connected on the outlet pipe way.
Description
Technical Field
The utility model relates to the technical field of power station boiler dust collectors, in particular to a novel low-pressure economizer wall temperature controllable system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the exhaust temperature of some domestic power plant boilers is higher, so that the operation efficiency of the boilers is reduced, and the standard coal consumption of a unit is increased; in addition, if the power plant is equipped with a desulfurization system, the exhaust gas temperature needs to be greatly reduced. From the technical transformation perspective of the power plant, various schemes can achieve the purpose of reducing the exhaust gas temperature, and the addition of a low-pressure economizer in a thermal system of the power plant is one of the problems.
The low-pressure economizer is one of the effective measures for saving energy by utilizing the waste heat of the boiler exhaust gas and is quite special. The low-pressure economizer is arranged at the tail part of the boiler and has a structure similar to that of a common economizer. The inlet water of the low-pressure economizer is taken from a low-pressure heat recovery system of the steam turbine, and the low-saving water inflow and the inlet water temperature can be adjusted in operation. After entering low-saving condensed water to absorb the heat of boiler exhaust smoke, the boiler exhaust smoke is converged with main condensed water at the inlet of the deaerator.
Considering the cost of the whole equipment, the low-pressure economizer is generally designed to be ND steel or carbon steel, and because low-temperature flue gas cooled by the low-pressure economizer has certain corrosiveness, in order to ensure the safe operation of the equipment, the minimum wall temperature of a heating surface is required to be not lower than a setting value, and the minimum wall temperature of the heating surface is directly related to the temperature of inlet water, namely the minimum inlet water temperature is required to be not lower than a setting value (about 70 ℃ in general) by the low-pressure economizer.
In a conventional system, the water inlet temperature of the low-pressure economizer is determined by the water temperature of a low-pressure heat recovery system of a steam turbine, the water temperature of each stage of heat recovery system does not just meet the water inlet temperature requirement of the low-pressure economizer, the water inlet temperature is selected to be too high, the heat exchange effect of equipment is affected, the manufacturing cost of the low-pressure economizer is increased, the water inlet temperature is selected to be too low, the low-temperature corrosion risk exists in the low-pressure economizer, and the safety of the whole system is affected. And because the large-scale boiler of the present power station is a peak shaver set, the boiler load changes greatly according to the needs, and the inlet water temperature entering the low-pressure economizer system changes along with the change, the whole low-pressure economizer system cannot operate under the design working condition for a long time.
Disclosure of Invention
Aiming at the defects existing in the prior art, the first object of the utility model is to provide a novel low-pressure economizer wall temperature controllable system, so as to ensure that the minimum inlet water temperature required by the low-pressure economizer system is not lower than a certain setting value.
In order to achieve the above object, the present utility model is realized by the following technical scheme:
the utility model provides a novel low pressure economizer wall temperature controllable system, includes low pressure economizer, be connected with inlet tube way and outlet pipe way on the low pressure economizer respectively, the outlet pipe way is connected with the recirculation water line, the other end of recirculation water line is connected on the outlet pipe way.
Further, a recirculation pipeline regulating valve group is arranged on the recirculation water pipeline.
Further, a circulating water pump set is arranged between the recirculation pipeline regulating valve group and the low-pressure economizer.
Further, the water outlet pipeline is connected with the steam turbine regenerative system.
Further, the water inlet pipeline is connected with the steam turbine regenerative system.
Further, a water inlet temperature measuring point is arranged on the water inlet pipeline.
Further, the water inlet temperature measuring point is arranged at the water inlet of the water inlet pipeline.
Further, a wall temperature measuring point is arranged on the economizer.
Further, a water temperature measuring point after water mixing is arranged on a water inlet pipeline above a water inlet of the coal economizer.
Further, temperature sensors are arranged on the water inlet temperature measuring point, the wall temperature measuring point and the water temperature measuring point after water mixing.
The beneficial effects of the utility model are as follows:
1) The wall temperature measuring points are additionally arranged on the wall of the heat exchange pipe of the economizer, a water circulation loop and an adjusting control device are added to the low-pressure economizer system, so that the low-pressure economizer system is ensured that the minimum wall temperature is not lower than a certain setting value, and the circulation loop leads a part of low-pressure economizer outlet high-temperature water back to the low-pressure economizer inlet; when the temperature of the wall temperature measuring point of the economizer is lower than a certain setting value, the high temperature water and the low temperature water at the outlet of the low-pressure economizer are mixed to reach a design value, so that the problem that the wall temperature of a pipe is low due to the fact that the water inlet temperature of the low-pressure economizer is too low, low-temperature corrosion exists, and the safety of the whole system is affected is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a schematic diagram of a novel low pressure economizer wall temperature controllable system in accordance with one or more embodiments of the present utility model.
In the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustration is only schematic.
Wherein: 1. the system comprises a water inlet pipeline 2, a water outlet pipeline 3, a recirculation water pipeline 4, a circulating water pump set 5, a low-pressure economizer 6, a water inlet temperature measuring point 7, a water temperature measuring point after mixing 8, a water outlet temperature measuring point 9, a recirculation pipeline regulating valve group 10, a steam turbine regenerative system 11 and a wall temperature measuring point.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular forms also are intended to include the plural forms unless the present utility model clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "upper", "lower", "left" and "right" in the present utility model, if they mean only the directions of upper, lower, left and right in correspondence with the drawings themselves, are not limiting in structure, but merely serve to facilitate description of the present utility model and simplify description, rather than to indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Term interpretation section: the terms "mounted," "connected," "secured," and the like in the present utility model are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the terms are used herein as specific meanings as understood by those of ordinary skill in the art, and are not limited to the following terms.
Example 1
In a typical embodiment of the utility model, referring to fig. 1, a novel wall temperature controllable system of a low-pressure economizer comprises a low-pressure economizer 5, wherein the low-pressure economizer is arranged at the tail part of a boiler, the low-pressure economizer is respectively connected with a water inlet pipeline 1 and a water outlet pipeline 2, the water outlet pipeline is connected with a recirculation water pipeline 3, and the other end of the recirculation water pipeline is connected with the water outlet pipeline.
The recirculation water pipeline is provided with a recirculation pipeline regulating valve group 9 for regulating the recirculation pipeline.
A circulating water pump group 4 is arranged between the recirculation pipeline regulating valve group and the low-pressure economizer.
And part of high-temperature water at the outlet of the low-pressure economizer is led back to the inlet of the low-pressure economizer through a circulation loop, and the high-temperature water at the outlet of the low-pressure economizer is mixed with low-temperature water to reach a design value, so that the problem that the wall temperature of a pipe is low due to the fact that the temperature of the inlet water of low-pressure economizer equipment is too low, low-temperature corrosion risk exists, and the safety of the whole system is influenced is avoided.
Example two
Referring to FIG. 1, a novel wall temperature controllable system of a low-pressure economizer comprises a low-pressure economizer 5, wherein the low-pressure economizer is arranged at the tail part of a boiler, the low-pressure economizer is respectively connected with a water inlet pipeline 1 and a water outlet pipeline 2, the water outlet pipeline is connected with a recirculation water pipeline 3, and the other end of the recirculation water pipeline is connected with the water outlet pipeline.
The recirculation water pipeline is provided with a recirculation pipeline regulating valve group 9 for regulating the recirculation pipeline.
A circulating water pump group 4 is arranged between the recirculation pipeline regulating valve group and the low-pressure economizer.
The water outlet pipeline is connected with the steam turbine heat recovery system 10, and the water inlet pipeline is connected with the steam turbine heat recovery system. The steam turbine regenerative system is the low-pressure regenerative system of the steam turbine.
The water inlet pipeline is provided with a water inlet temperature measuring point 6 which is arranged at the water inlet of the water inlet pipeline and is used for measuring the water inlet temperature before being mixed with the high-temperature water in the recirculating water pipeline.
The economizer is provided with a wall temperature measuring point 11.
The water inlet pipeline above the water inlet of the coal economizer is provided with a water temperature measuring point 7 after mixing water.
The water outlet pipe is provided with a water outlet temperature measuring point 8.
Temperature sensors are arranged on the water inlet temperature measuring point, the wall temperature measuring point, the water outlet temperature measuring point and the water temperature measuring point after mixing, the temperature data of each position are monitored in real time, and the temperature sensors of the measuring points, the circulating water pump group and the recirculation pipeline regulating valve group 9 are all connected with a controller.
The adjusting control device comprises a controller and an adjusting valve.
The wall temperature measuring points are additionally arranged on the wall of the heat exchange pipe of the economizer, and the water circulation loop and the adjusting and controlling device are additionally arranged in the low-pressure economizer system, so that the low-pressure economizer system is ensured to require that the minimum wall temperature is not lower than a certain setting value.
Specifically, the temperature sensor of the wall temperature measuring point transmits temperature data to the controller, the controller compares the temperature value of the wall temperature measuring point with a setting value, when the temperature of the wall temperature measuring point of the economizer is lower than the setting value of 70 ℃, the controller controls the recirculation pipeline regulating valve group circulation loop to introduce part of high-temperature water at the outlet of the low-pressure economizer back to the inlet of the low-pressure economizer, and the high-temperature water at the outlet of the low-pressure economizer is mixed with low-temperature water to be more than 70 ℃, so that the problem that the wall temperature of a pipe is lower due to the fact that the temperature of inlet water of the low-pressure economizer is too low, low-temperature corrosion risk exists, and the safety of the whole system is affected is avoided.
The system has simple structure, can be automatically controlled, the whole low-pressure economizer equipment is not corroded by low temperature of flue gas, the safe and normal operation of the whole low-pressure economizer system is ensured, and the system reliability is greatly enhanced.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The novel low-pressure economizer wall temperature controllable system is characterized by comprising a low-pressure economizer, wherein the low-pressure economizer is respectively connected with a water inlet pipeline and a water outlet pipeline, the water outlet pipeline is connected with a recirculation water pipeline, and the other end of the recirculation water pipeline is connected with the water outlet pipeline.
2. The novel low pressure economizer wall temperature controllable system of claim 1 wherein the recirculation water line is provided with a recirculation line regulator valve set.
3. The novel low-pressure economizer wall temperature controllable system according to claim 2, wherein a circulating water pump set is arranged between the recirculation pipeline regulating valve group and the low-pressure economizer.
4. The novel low pressure economizer wall temperature control system of claim 1 wherein the water outlet line is connected to a steam turbine regenerator system.
5. The novel low pressure economizer wall temperature control system of claim 1 wherein the water inlet line is connected to a steam turbine regenerator system.
6. The novel low-pressure economizer wall temperature controllable system according to claim 1, wherein a water inlet temperature measuring point is arranged on the water inlet pipeline.
7. The novel low-pressure economizer wall temperature controllable system according to claim 6, wherein the water inlet temperature measuring point is arranged at a water inlet of the water inlet pipeline.
8. The novel low-pressure economizer wall temperature controllable system according to claim 7, wherein the economizer is provided with a wall temperature measuring point.
9. The novel wall temperature controllable system of the low-pressure economizer according to claim 8, wherein a water temperature measuring point after water mixing is arranged on a water inlet pipeline above a water inlet of the economizer.
10. The novel wall temperature controllable system of the low-pressure economizer according to claim 9, wherein the water inlet temperature measuring point, the wall temperature measuring point and the water temperature after mixing measuring point are all provided with temperature sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223284536.XU CN219199138U (en) | 2022-12-05 | 2022-12-05 | Novel wall temperature controllable system of low-pressure economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223284536.XU CN219199138U (en) | 2022-12-05 | 2022-12-05 | Novel wall temperature controllable system of low-pressure economizer |
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| Publication Number | Publication Date |
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| CN219199138U true CN219199138U (en) | 2023-06-16 |
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| CN202223284536.XU Active CN219199138U (en) | 2022-12-05 | 2022-12-05 | Novel wall temperature controllable system of low-pressure economizer |
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2022
- 2022-12-05 CN CN202223284536.XU patent/CN219199138U/en active Active
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