CN-122014373-A - Pump auxiliary steam source pressure regulating system and control method thereof

CN122014373ACN 122014373 ACN122014373 ACN 122014373ACN-122014373-A

Abstract

The invention discloses a pressure regulating system of a steam pump auxiliary steam source and a control method thereof, wherein the pressure regulating system comprises a steam source access module, a pressure acquisition module, an adjustment execution module, an adjustment coordination unit, a steam source soft switching module and a pressure stabilizing module; the auxiliary steam source pressure regulating system of the steam pump realizes the advanced pressure compensation of the output pipeline when the pressure of the main steam decreases through the synergistic effect of the steam source access module and the pre-filling unit, effectively avoids the sudden drop of the pressure of the downstream pipeline, ensures the continuity of steam supply, ensures that the pressure acquisition module forms closed-loop feedback through the near-end pressure acquisition unit and the far-end pressure correction unit, enables the regulating execution module to quickly regulate the output pressure of the main steam and the standby steam according to a real-time deviation signal, and the regulating coordination unit dynamically distributes the opening through the weight balance unit to form master-slave linkage control so as to promote the overall regulating response speed and the accuracy.

Inventors

HAN XU
CHENG HAOLUN
WANG XIANG
LI DONGDONG
ZHENG TIANQUAN
WANG RONGFENG
LV HAIPENG
WANG XINDING
JI PENGFEI
ZHAI RUI
CONG SHULIN
GUO TAO
GONG ZILIANG
SAI BEI
LI ZHENYU
ZHANG JUNQIAO
CONG SHUGUANG
GUO HAO
LI MANGMANG
Ai Fangxing
SHEN ZHAOLIANG
CHEN ZHU

Assignees

华能国际电力股份有限公司大连电厂

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (10)

1. The system is characterized by comprising a steam source access module, a pressure acquisition module, an adjustment execution module, an adjustment coordination unit, a steam source soft switching module and a pressure stabilization module; The steam source access module is used for accessing main steam and standby steam, and supplementing pressure in advance when the pressure drop trend of the main steam occurs through the pre-filling unit; The pressure acquisition module comprises a near-end pressure acquisition unit and a far-end pressure correction unit, acquires output pressure in real time, generates a deviation signal and provides the deviation signal for the adjustment execution module to form closed-loop feedback control; The adjusting execution module comprises a main adjusting unit and an auxiliary adjusting unit, and the main steam and the standby steam are respectively adjusted; The adjusting coordination unit receives the output pressure feedback of the adjusting execution module, dynamically distributes the opening of the main adjusting unit and the opening of the auxiliary adjusting unit through the weight balancing unit in the adjusting coordination unit, and limits the opening difference between the main adjusting unit and the auxiliary adjusting unit, so that the main adjusting unit and the auxiliary adjusting unit cooperatively form master-slave dynamic linkage control; the steam source soft switching module comprises a pressure pre-balancing unit, a buffer adjusting unit and a switching transition unit, wherein when the steam source is switched, the pressure of the new steam source and the old steam source is firstly leveled, transient pressure fluctuation is buffered, and gradual adjustment quantity is output; The pressure stabilizing module comprises a fluctuation reducing unit, an output smoothing unit and a flow state integrating unit, and performs pulsation suppression, smoothing treatment and flow state integration on the output pressure of the adjusting execution module to realize the constant downstream pressure and form closed-loop control with the adjusting execution module.
2. The system for regulating the pressure of the auxiliary steam source of the steam pump according to claim 1, wherein the pressure acquisition module, the regulation execution module, the steam source soft switching module and the pressure stabilization module are logically related in that the pressure acquisition module continuously acquires the pressure and triggers the action of the regulation execution module, the output pressure of the regulation execution module is fed back to the regulation coordination unit, the steam source soft switching module cooperates with the regulation execution module in the switching process, and the pressure stabilization module carries out post-treatment on the output pressure; wherein, the output adjustment amount of the adjustment execution module can be expressed as the following formula: Wherein, the In order to adjust the output pressure of the execution module, In order to achieve the target pressure, the pressure, As a measure of the pressure at the proximal end, And (3) with Respectively, the weight coefficients of the two groups are adjusted, To adjust the output pressure of the execution module at time t; the soft-switch module output pressure ramp may be expressed as the following equation: Wherein, the In order to output the pressure during the switching process, Is the pressure of the original steam source, Is the pressure of the new gas source, In order to switch the transition time of the switch, The time elapsed from the start of the switching to the current time is represented in a switching process pressure formula; the gradual change type switching flow is formed among the pressure pre-balancing unit, the buffer adjusting unit and the switching transition unit of the steam source soft switching module and is as follows: When detecting the switching condition of the steam source, the pressure pre-balancing unit levels the pressure of the new steam source and the old steam source, the buffer adjusting unit suppresses transient fluctuation according to pressure change, and the switching transition unit generates an intermediate adjusting quantity to output a downstream pipeline.
3. The system according to claim 1, wherein the proximal pressure acquisition unit of the pressure acquisition module continuously acquires the output pressure and provides the data to the adjustment execution module; The remote pressure correction unit generates a correction signal according to the upstream pressure change and performs deviation correction on the adjusting execution module; the pressure acquisition unit and the remote pressure correction unit cooperate to form a closed-loop feedback control so that the output pressure follows the target pressure in real time.
4. The system according to claim 1, wherein the main adjusting unit and the auxiliary adjusting unit of the adjusting execution module form master-slave linkage control through an adjusting coordination unit, the main adjusting unit rapidly adjusts the main steam according to the near-end pressure signal, the auxiliary adjusting unit performs auxiliary compensation adjustment according to the main adjusting deviation, the adjusting coordination unit monitors the opening difference of the main adjusting unit and the auxiliary adjusting unit in real time, and the adjusting proportion is dynamically distributed through the weight balancing unit.
5. The system according to claim 1, wherein the fluctuation reducing unit suppresses output pressure pulsation, the output smoothing unit further smoothes the pressure curve, the flow state integrating unit performs flow state integration according to the flow speed and pressure variation, realizes downstream pressure constancy, and buffers the pressure abrupt change.
6. The system of claim 1, wherein the vapor source access module comprises a main vapor access unit, a standby vapor access unit, and a pre-filling unit.
7. The system according to claim 1, wherein the adjustment coordination unit comprises an opening degree limiting unit and a weight balancing unit; the opening limiting unit constrains the maximum adjusting range of the main adjusting unit and the auxiliary adjusting unit, and the weight balancing unit adjusts the adjusting proportion according to the real-time output pressure of the main adjusting unit and the auxiliary adjusting unit.
8. The system according to claim 1, wherein the flow state integrating unit of the pressure stabilizing module performs real-time fine adjustment according to the downstream flow speed and pressure change, so that the flow state of the steam is stable and the pressure is constant, and the integrated treatment is performed by the cooperative fluctuation reducing unit and the output smoothing unit.
9. The system according to claim 1, wherein the switching transition unit of the soft switching module outputs an intermediate adjustment amount during switching of the steam source, and the pressure pre-balancing unit and the buffer adjustment unit cooperate to form a gradual output of the pressure during switching.
10. A method for controlling the pressure regulation of a pump-assisted vapor source, applied to the regulation system according to any one of claims 1 to 9, comprising the steps of: S1, acquiring output pressure by a near-end pressure acquisition unit, and providing a deviation signal by a far-end pressure correction unit; S2, the main adjusting unit executes main adjustment according to the near-end pressure, the auxiliary adjusting unit executes auxiliary adjustment according to main adjustment deviation, and the output pressure meets an output adjustment quantity formula of the adjustment executing module; s3, the adjusting coordination unit monitors the opening difference of the main adjusting unit and the auxiliary adjusting unit in real time, and dynamically adjusts the adjusting proportion through the weight balancing unit to realize master-slave linkage control; s4, when the steam source switching condition is detected, the pressure pre-balancing unit levels the new and old steam source pressure in advance; s5, buffering the pressure change in the switching period by the buffer adjusting unit and the switching transition unit, and gradually changing the output pressure to meet the output pressure gradual changing formula of the soft switching module; and S6, carrying out final stabilization treatment on the regulated output by a fluctuation reduction unit, an output smoothing unit and a flow state integration unit of the pressure stabilization module so as to enable the downstream pressure to be constant.

Description

Pump auxiliary steam source pressure regulating system and control method thereof Technical Field The invention relates to the technical field of regulation of auxiliary steam sources of steam pumps, in particular to a pressure regulation system of an auxiliary steam source of a steam pump and a control method of the pressure regulation system. Background The existing auxiliary steam source pressure regulating device of the steam pump usually depends on a single-path pressure control or static valve regulating mode, the switching of main steam and standby steam is realized through a simple pressure switch or a mechanical valve, in the industrial production process, as the steam load changes frequently, the traditional device easily generates transient pressure fluctuation when the pressure of the main steam is reduced or the standby steam is switched, so that the pressure of a downstream pipeline is suddenly reduced or is pulsed, and the operation stability of steam driving equipment is further influenced. In practice, there are still some problems: In the traditional steam source switching process, the pressure difference between new and old steam sources is large, pressure jump is easy to generate at the switching moment, impact is brought to downstream equipment, the service life of the equipment is reduced, the maintenance cost is increased, an effective buffer adjusting mechanism and gradual change switching logic are lacked in the existing scheme, soft switching and smooth pressure output cannot be realized, master-slave linkage control of an adjusting execution module is not fully utilized, and the pressure adjusting process is delayed and unstable; thus, the following problems remain in the prior art in industrial production: the stability of the downstream pressure is poor, and sudden drop or pulsation is easy to occur; the transient pressure impact of the switching of the steam source is large, and gradual switching and buffer control are lacked; The regulation execution module is lack of effective cooperation with the pressure acquisition module, the regulation coordination unit and the pressure stabilization module, complete closed-loop control cannot be formed, the regulation precision and the response speed are limited, and the technical defects restrict the stable operation and the reliability of the steam pressure regulating device under high-load and complex working conditions. Disclosure of Invention Therefore, the invention provides a system for regulating the pressure of a steam pump auxiliary steam source and a control method thereof, which are used for solving the problems of jump of the switching pressure of the steam source, lack of buffering and closed-loop cooperative control in the prior art. In order to achieve the aim, the invention provides the technical scheme that the auxiliary steam source pressure regulating system of the steam pump comprises a steam source access module, a pressure acquisition module, a regulating execution module, a regulating coordination unit, a steam source soft switching module and a pressure stabilizing module; The steam source access module is used for accessing main steam and standby steam, and supplementing pressure in advance when the pressure drop trend of the main steam occurs through the pre-filling unit; The pressure acquisition module comprises a near-end pressure acquisition unit and a far-end pressure correction unit, acquires output pressure in real time, generates a deviation signal and provides the deviation signal for the adjustment execution module to form closed-loop feedback control; The adjusting execution module comprises a main adjusting unit and an auxiliary adjusting unit, and the main steam and the standby steam are respectively adjusted; The adjusting coordination unit receives the output pressure feedback of the adjusting execution module, dynamically distributes the opening of the main adjusting unit and the opening of the auxiliary adjusting unit through the weight balancing unit in the adjusting coordination unit, and limits the opening difference between the main adjusting unit and the auxiliary adjusting unit, so that the main adjusting unit and the auxiliary adjusting unit cooperatively form master-slave dynamic linkage control; the steam source soft switching module comprises a pressure pre-balancing unit, a buffer adjusting unit and a switching transition unit, wherein when the steam source is switched, the pressure of the new steam source and the old steam source is firstly leveled, transient pressure fluctuation is buffered, and gradual adjustment quantity is output; The pressure stabilizing module comprises a fluctuation reducing unit, an output smoothing unit and a flow state integrating unit, and performs pulsation suppression, smoothing treatment and flow state integration on the output pressure of the adjusting execution module to realize the constant downstream pressure and form closed-loop control with the a