First, system overview:
The 12MW turbo-generator unit is currently the most widely used unit for domestic waste heat power generation. Generally speaking, 12MW steam turbines mostly use the pumping-condensing type. It only has one-level adjustment of extraction steam and also supports the same power generator. Its thermal inspection and control system can be divided into: analog control system (MCS) system, sequential control system (SCS), data acquisition system (DAS) and emergency trip system (ETS), these systems according to the current computer The safety factor can be achieved by using a distributed control system for these parts. Through a system, these parts can be combined organically to achieve unity of functions and reduce the workload of maintenance personnel.
Second, the analog control system (MCS)
In the 12MW turbo-generator set, the analog control system is single-loop control and is generally divided into: deaerator water level and pressure regulation system, high-pressure temperature and pressure regulator temperature and pressure regulation system, and low-pressure temperature reduction Pressure regulator temperature and pressure regulation system.
2ã€1 Deaerator water level and pressure regulation system
2.1.1 Deaerator pressure regulation system
In the deaerator pressure regulation system, the steam from the desuperheater and pressure reducer is used during the unit start-up, and the steam turbine used after the normal operation of the unit is adjusted to extract steam, so that the deaerator pressure is maintained at a preset value; In normal operating conditions, the setpoint tracks deaerator pressure. In the deaerator pressure regulation system, the deaerator pressure measurement value is sent to the PID together with a given value for calculation. The calculation result is used to adjust the deaerator pressure adjustment valve and maintain the deaerator pressure at a preset value.
2.1.2 Deaerator water level adjustment system
The water used in the deaerator water level adjustment system is derived from desalinated water, and the water level of the deaerator is controlled by adjusting the regulating valve on the desalinated water pipe.
2,2 temperature and pressure regulator adjustment system
The working principle of the high temperature desuperheater and pressure reducer system and the low temperature desuperheater and pressure reducer system are the same. They all control the steam pressure at the outlet of the desuperheating pressure reducer by adjusting the steam volume control valve that enters the desuperheating pressure reducer. At the same time, the temperature at the outlet of the desuperheater and pressure reducer is controlled by adjusting the desuperheating water control valve that enters the desuperheater and pressure reducer. Because the high-temperature desuperheater and the low-temperature desuperheater all have the same working principle, they are all single-loop control and the control method is very simple.
Third, the sequence control system (SCS)
The sequential control system of the turbine section is mainly the coupling of some pumps themselves with each other and the coupling of the pumps and the valves in their own systems.
There are mainly the following sequence control loops:
1. Control logic for feed pumps, circulating pumps, and condensate pumps.
2, the pressure of the lubricant pump interlocking, interlocking logic.
Fourth, the data acquisition system (DAS)
In the control system of the steam turbine, a large amount of data is collected for monitoring purposes. Therefore, as long as we do some historical curves, we can satisfy the purpose of monitoring the control system and operating personnel.
V. Emergency Trip System (ETS)
The Emergency Trip System (ETS) is the most important part of the entire turbine control system. If there is a problem with this part, most of them are serious problems and bring serious economic losses. Therefore, this part is the most important part of the entire turbine control system. In order to ensure the safe operation of the entire system, we mainly consider the following several shutdown protection conditions in the actual commissioning work, but these shutdown protection conditions can be selected for commissioning and removal according to actual needs. Moreover, the work of this part should be based on the customer's requirements and select those few as protection conditions. .
Sixth, 12MW turbine generator sets of measurement points:
The approximate number of points for a 12MW turbine generator set is as follows:
Type Design Requirements Actual Configuration Notes
AI 4-20mA 58 67
Thermal resistance 61 71
Thermocouple 10 12
AO 4-20mA 8 10
DI 117 136
DO 66 76
Subtotal points 320 372
VII. Analysis of 12MW Steam Turbine Generator Set Control System
SunyTDC92000 distributed control system is a set of all-digital DCS independently designed by Zhejiang Zonda Zhongzi Integrated Control Co., Ltd. with its own power. It has dual CPU processing technology, intelligent I/O technology, redundancy technology, communication technology and real-time database. The technical aspects have reached the international advanced level. It can mainly finish the management function of the factory level. The comprehensive redundant structure of the system ensures the safe operation of the turbine generator set. At present, we have successfully applied the case in Shandong Dongying Yuanbo Power Plant.
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