CN210135832U - Multi-valve-group linkage control mechanism for improving regulating capacity of cooling system - Google Patents
Multi-valve-group linkage control mechanism for improving regulating capacity of cooling system Download PDFInfo
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- CN210135832U CN210135832U CN201920738081.3U CN201920738081U CN210135832U CN 210135832 U CN210135832 U CN 210135832U CN 201920738081 U CN201920738081 U CN 201920738081U CN 210135832 U CN210135832 U CN 210135832U
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Abstract
A multi-valve-group linkage control mechanism for improving the adjusting capacity of a cooling system comprises a heat exchanger, a cold side inlet pipeline, a hot side inlet pipeline and a hot side outlet pipeline which are communicated with the heat exchanger, a cooling water outlet pipeline communicated with the heat exchanger, an adjusting valve B and an adjusting valve A which are arranged along the water flow direction of the cooling water outlet pipeline, and a control system for controlling the adjusting valve B and the adjusting valve A; control system including be used for detecting the temperature detection original paper of hot side outlet pipe exit temperature, simultaneously with adjusting valve B and the continuous controller B of temperature detection original paper control and simultaneously with adjusting valve A and the continuous controller A of temperature detection original paper control. The utility model discloses a bivalve combined mechanism coordinated control's mode to solve the regulation characteristic that former adjusting valve A exists under the low flow operating mode not good and lead to the frequent undulant scheduling problem of heat exchanger hot side outlet temperature.
Description
Technical Field
The utility model relates to a many valve trains coordinated control mechanism for improving cooling system regulating power.
Background
For keeping constant outlet temperature of a part of cooling systems of the nuclear power plant, the outlet temperature of the system is controlled by controlling the opening of a cooling water flow regulating valve in design. Taking a shell-and-tube heat exchanger of a nuclear power plant as an example, the heat of the heat exchanger is discharged from the heat discharging side, and the fluid flows through the tube side, and the cooling water flows through the shell side, wherein a shell side regulating valve is used for controlling the flow of the cooling water, and the opening degree of the regulating valve is controlled by the outlet temperature of the tube side. The design of the heat exchanger needs to take account of the operation working condition with larger span. The cold and heat load parameters are selected when the heat exchanger is designed, and besides the normal leakage working condition, the influence caused by the design hypothetical working condition, extreme climate and the like is also considered. The method specifically comprises the following steps:
in the design stage, the single-orifice plate downward-discharging working condition that the inlet temperature of the hot side of the normal operation of the unit is about 140 ℃ and the flow rate is 13.6t/h needs to be considered, and the operating working condition that the inlet temperature of the hot side of the reactor is 195.7 ℃ and the flow rate is 27.06t/h needs to be considered at the end stage of reactor temperature rise;
considering the influence caused by the long-term operation dirt coefficient of the equipment, and simultaneously designing a certain pipe plugging allowance;
the design also needs to consider the influence of different climatic environments on the temperature of the cold side inlet, and the temperature change range of the cooling water side inlet is designed to be 15-35 ℃.
In order to ensure that the heat exchanger can simultaneously bear the working conditions of high temperature at the hot side, low temperature at the cold side and design margin (dirt coefficient and pipe blocking rate) of the heat exchanger, the working condition for determining the size of the heat exchanger is that the fluid temperature at the cold side and the fluid temperature at the cold side both reach the highest design temperature, and meanwhile, a part of design margin is superposed. Therefore, under the normal operation condition of the unit, in order to ensure that the temperature of the outlet at the hot side reaches a set value, the condition that the operation condition of the cooling water deviates from the design condition occurs. When the inlet temperature of the shell side is gradually reduced, in order to ensure that the outlet temperature of the hot side of the heat exchanger is maintained at a set value of 46 ℃, under the action of the regulating valve, the flow of the shell side is also gradually reduced, and the minimum value of 12.3t/h is reached when the inlet temperature of the cooling water is 15 ℃.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multi-valve-group linkage control mechanism for improving the adjusting capacity of a cooling system, which aims to solve the technical problem of poor adjusting characteristic in the operation process of the prior art; and the problem that the temperature of the hot side outlet can not be reasonably ensured to reach a set value in the prior art is solved.
The utility model provides a technical scheme that its technical problem adopted is:
a multi-valve-group linkage control mechanism for improving the regulating capacity of a cooling system comprises a heat exchanger, a cold-side inlet pipeline, a hot-side inlet pipeline and a hot-side outlet pipeline which are all communicated with the heat exchanger, wherein isolation valves are arranged on the hot-side outlet pipeline, the cold-side inlet pipeline and the hot-side inlet pipeline; control system including the temperature detection original paper that is used for detecting hot side outlet pipe outlet temperature, simultaneously with adjusting valve B and the controller B that the control of temperature detection original paper links to each other and simultaneously with adjusting valve A and the control of temperature detection original paper controller link to each other, adjusting valve A passes through data line to the temperature detection original paper transmission valve aperture feedback signal.
Further preferably, the temperature detecting element detects that the opening of the regulating valve a is greater than 25 degrees, and then the controller a controls the regulating valve a to control the water yield of the cooling water outlet pipe, wherein when the temperature detecting element detects that the temperature of the hot side outlet pipe is greater than 46 ℃, the opening and closing degree of the regulating valve a is controlled to increase, and when the temperature is less than 46 ℃, the opening and closing degree of the regulating valve a is controlled to decrease.
More preferably, the temperature detection element detects that the opening degree of the regulating valve a is equal to 25 degrees, and the temperature detection element controls the opening degree of the regulating valve B through the controller B.
Implement the utility model discloses following beneficial effect can be reached:
the utility model adopts the linkage control mode of the double-valve combination mechanism on the basis of not changing the original valve structure, so as to solve the problem that the original regulating valve A has poor flow regulation under the low-flow working condition;
the utility model discloses keep former adjusting valve A, newly increase an adjusting valve B and former adjusting valve A series connection and arrange, new adjusting valve B is used for realizing the stable control under the low flow operating mode, and adjusting valve A and adjusting valve B work jointly separately adjust, independent control big, small flow operating mode to guarantee heat exchanger cooling system's stability, reliable regulation.
Drawings
Fig. 1 is a schematic structural diagram of a multi-valve-group linkage control mechanism for improving the adjusting capability of a cooling system.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
A multi-valve-group linkage control mechanism for improving the adjusting capacity of a cooling system comprises a heat exchanger 1, a cold side inlet pipeline 2, a hot side inlet pipeline 3 and a hot side outlet pipeline 8 which are communicated with the heat exchanger 1, wherein isolation valves 4 are arranged on the hot side outlet pipeline 8, the cold side inlet pipeline 2 and the hot side inlet pipeline 3, a cooling water outlet pipeline 5 communicated with the heat exchanger 1, an adjusting valve B6 and an adjusting valve A7 which are arranged along the water flow direction of the cooling water outlet pipeline 5, and a control system for controlling the adjusting valve B6 and the adjusting valve A7; the control system comprises a temperature detection element 9 for detecting the temperature of the outlet of the hot-side outlet pipe 8, a controller B10 which is simultaneously connected with a regulating valve B6 and the temperature detection element 9 in a control mode, and a controller A11 which is simultaneously connected with a regulating valve A7 and the temperature detection element 9 in a control mode, wherein the regulating valve A7 transmits a valve opening feedback signal to the temperature detection element 9 through a data line.
Example one
A multi-valve-group linkage control mechanism for improving the adjusting capacity of a cooling system comprises a heat exchanger 1, a cold side inlet pipeline 2, a hot side inlet pipeline 3 and a hot side outlet pipeline 8 which are communicated with the heat exchanger 1, wherein isolation valves 4 are arranged on the hot side outlet pipeline 8, the cold side inlet pipeline 2 and the hot side inlet pipeline 3, a cooling water outlet pipeline 5 communicated with the heat exchanger 1, an adjusting valve B6 and an adjusting valve A7 which are arranged along the water flow direction of the cooling water outlet pipeline 5, and a control system for controlling the adjusting valve B6 and the adjusting valve A7; the control system comprises a temperature detection element 9 for detecting the temperature of the outlet of the hot-side outlet pipe 8, a controller B10 which is simultaneously connected with a regulating valve B6 and the temperature detection element 9 in a control mode, and a controller A11 which is simultaneously connected with a regulating valve A7 and the temperature detection element 9 in a control mode, wherein the regulating valve A7 transmits a valve opening feedback signal to the temperature detection element 9 through a data line. When the temperature detecting element 9 detects that the opening degree of the adjusting valve a7 is greater than 25 degrees, the controller a11 controls the adjusting valve a7 to control the water yield of the cooling water outlet pipe 5, wherein when the temperature detecting element 9 detects that the temperature of the hot side outlet pipe 8 is greater than 46 ℃, the opening degree of the adjusting valve a7 is controlled to be increased, and when the temperature is less than 46 ℃, the opening degree of the adjusting valve a7 is controlled to be decreased.
Example two
A multi-valve-group linkage control mechanism for improving the adjusting capacity of a cooling system comprises a heat exchanger 1, a cold side inlet pipeline 2, a hot side inlet pipeline 3 and a hot side outlet pipeline 8 which are communicated with the heat exchanger 1, wherein isolation valves 4 are arranged on the hot side outlet pipeline 8, the cold side inlet pipeline 2 and the hot side inlet pipeline 3, a cooling water outlet pipeline 5 communicated with the heat exchanger 1, an adjusting valve B6 and an adjusting valve A7 which are arranged along the water flow direction of the cooling water outlet pipeline 5, and a control system for controlling the adjusting valve B6 and the adjusting valve A7; the control system comprises a temperature detection element 9 for detecting the temperature of the outlet of the hot-side outlet pipe 8, a controller B10 which is simultaneously connected with a regulating valve B6 and the temperature detection element 9 in a control mode, and a controller A11 which is simultaneously connected with a regulating valve A7 and the temperature detection element 9 in a control mode, wherein the regulating valve A7 transmits a valve opening feedback signal to the temperature detection element 9 through a data line. The temperature detecting element 9 detects that the opening degree of the regulator valve a7 is equal to 25 degrees, and the temperature detecting element 9 controls the opening degree of the regulator valve B6 through the controller B10.
The utility model discloses a concrete using-way, at first calculate cooling water system normal operating flow operating mode scope through hydraulic modeling simulation, correspond former valve (adjusting valve A) normal maximum operation aperture, and regard as the critical point that two valves drop into the operation with this respectively, with the realization can adapt to on-the-spot best regulation state, mode through two valve group coordinated control, large-traffic operating mode is through former adjusting valve A control promptly, the design theory that low flow operating mode controlled through new adjusting valve B, the regulation requirement of the cooling water design requirement operating mode (about 12.5-244.2t/h) of unable adaptation broad is solved, bivalve combination coordinated control logic is: reading an opening signal of an original regulating valve A, transmitting the opening signal to a temperature detection element for judgment, and transmitting an outlet temperature signal to a controller A under the working condition that the original regulating valve A is more than 25% in opening so as to control the flow of a cooling water system through the regulating valve A; and when the opening working condition of the original valve reaches a 25% fixed value, the temperature detection element is automatically switched to the newly added regulating valve B to realize flow control. Finally, the large-flow working condition is controlled by the original regulating valve A, and the low-flow working condition is controlled by the new regulating valve B. The cooling water flow under the normal working condition is lower than 50t/h and corresponds to the 25% opening of the original regulating valve A, so that the 25% opening working condition of the original valve is selected as a dividing point, the designed working condition dividing point does not bring frequent switching of a control system, and the stable and reliable regulation of the cooling system of the heat exchanger can be ensured.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (3)
1. The multi-valve-group linkage control mechanism is characterized by further comprising a cooling water outlet pipeline (5) communicated with the heat exchanger (1), an adjusting valve B (6) and an adjusting valve A (7) which are arranged along the water flow direction of the cooling water outlet pipeline (5), and a control system for controlling the adjusting valve B (6) and the adjusting valve A (7); control system including temperature detection original paper (9) that is used for detecting hot side outlet pipe (8) exit temperature, simultaneously with adjusting valve B (6) and temperature detection original paper (9) control continuous controller B (10) and simultaneously with adjusting valve A (7) and temperature detection original paper (9) control continuous controller A (11), adjusting valve A (7) transmit valve aperture feedback signal to temperature detection original paper (9) through the data line.
2. A multi-stack linkage control mechanism for increasing the turndown capability of a cooling system as claimed in claim 1, wherein: the temperature detection element (9) detects that the opening of the adjusting valve A (7) is larger than 25 degrees, then the controller A (11) controls the adjusting valve A (7) to control the water yield of the cooling water outlet pipeline (5), wherein when the temperature detection element (9) detects that the temperature of the hot side outlet pipeline (8) is larger than 46 ℃, the opening and closing degree of the adjusting valve A (7) is controlled to be increased, and when the temperature is smaller than 46 ℃, the opening and closing degree of the adjusting valve A (7) is controlled to be decreased.
3. A multi-stack linkage control mechanism for increasing the turndown capability of a cooling system as claimed in claim 1, wherein: temperature detection original paper (9) detect that adjusting valve A (7) aperture equals 25 degrees, and temperature detection original paper (9) pass through the degree of opening and shutting of controller B (10) control adjusting valve B (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920738081.3U CN210135832U (en) | 2019-05-22 | 2019-05-22 | Multi-valve-group linkage control mechanism for improving regulating capacity of cooling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920738081.3U CN210135832U (en) | 2019-05-22 | 2019-05-22 | Multi-valve-group linkage control mechanism for improving regulating capacity of cooling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074500A (en) * | 2021-03-10 | 2021-07-06 | 华电电力科学研究院有限公司 | Wisdom saving cooling water device suitable for cooler |
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2019
- 2019-05-22 CN CN201920738081.3U patent/CN210135832U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074500A (en) * | 2021-03-10 | 2021-07-06 | 华电电力科学研究院有限公司 | Wisdom saving cooling water device suitable for cooler |
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