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Boiler drum water level control system and control method thereof

A boiler steam drum and water level control technology, which is applied in the control of feed water, steam generation, preheating, etc., can solve the problems of slow running speed of the boiler feed water pump, difficulty in stably controlling the water level of the steam drum, and complicated control methods, so as to improve the thermal efficiency of the boiler , prevent false water level, even heating effect

Active Publication Date: 2018-06-29
INNER MONGOLIA NORTH HEAVY INDS GROUP
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Problems solved by technology

At present, the three-impulse control strategy is usually used to control the water level of the steam drum. The control method is complicated, and the farther the route length between the installation position of the boiler feed water flow meter and the boiler feed water pump is, the more lagging the flow data is, which is reflected in the operation effect of the boiler feed water pump. , will cause the system to oscillate, and the running speed of the boiler feed water pump is fast and slow
Therefore, the three-impulse control strategy is theoretically feasible, but in practice, there are many difficulties in stably controlling the drum water level

Method used

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  • Boiler drum water level control system and control method thereof
  • Boiler drum water level control system and control method thereof
  • Boiler drum water level control system and control method thereof

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Embodiment Construction

[0022] The technical solutions of the present invention will be described in detail below with reference to exemplary implementations. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

[0023] like figure 1 Shown is the principle diagram of the steam drum water level control system in the present invention.

[0024] Boiler drum water level control system includes: boiler feed water pump, boiler drum, PLC.

[0025] The boiler feed pump (motor pump) is equipped with a frequency converter and a drive motor, and the analog input terminal of the frequency converter is connected with the analog output module of the PLC, f B The signal adopts 4-20mA current signal. The inverter adopts frequency / voltage control mode. ...

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Abstract

The invention discloses a boiler drum water level control system. The boiler drum water level control system comprises a boiler feed pump, a boiler drum, and a programmable logic controller PLC, wherein a frequency changer and a driving motor are installed on the boiler feed pump, and the analog input terminal of the frequency changer is connected with the analog output module of the PLC; a firstpressure sensor is installed on the outlet of the boiler feed pump, and the first pressure sensor is connected with an analog input module of the PLC; a second pressure sensor is installed on the upper portion of the boiler drum, and the second pressure sensor is connected with the analog input module of the PLC; a content gauge is installed in the middle portion of the boiler drum, and the content gauge is connected with the analog input module of the PLC; and the PLC is used for controlling the rotating speed of the driving motor. The invention further discloses a boiler drum water level control method, the occurrence of false water level is prevented, and the smooth running of the control system is kept.

Description

technical field [0001] The invention relates to a steam boiler, in particular to a boiler drum water level control system and a control method thereof. Background technique [0002] There are measurement errors in the feed water flow and steam flow of the boiler, and the water level of the boiler drum also appears "false water level" phenomenon due to intermittent replenishment of water. At present, the three-impulse control strategy is usually used to control the water level of the steam drum. The control method is complicated, and the farther the route length between the installation position of the boiler feed water flow meter and the boiler feed water pump is, the more lagging the flow data is, which is reflected in the operation effect of the boiler feed water pump. , will cause the system to oscillate, and the running speed of the boiler feed water pump will be fast and slow. Therefore, the three-impulse control strategy is feasible in theory, but in practice, there a...

Claims

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Application Information

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IPC IPC(8): F22D5/30
CPCF22D5/30
Inventor 谢素东张昊为芦艳霞李国华杨志靖杨超周会平谷艳丽吴静高玲琴
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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