requestId:685ea5dcd06b45.01809709.
0 Introduction
Circulating fluidized bed machine power generation technology is a coal burning technology that is increasingly performing the increasingly important color in the power industry. In recent years, there have been hundreds of stages in my country’s investment and implementation of 300MW circulating fluidized bed machine contracts. The startup and commissioning task of the circulating fluidized bed boiler is a French way for the machine to invest in commercial operations, and the machine-debt test is the most important and most dangerous test during the entire infrastructure debugging process. The most direct and useful way to examine the dynamic characteristics of the car motor speed control system. Due to the burden of losing weight, Sugar daddy tests simultaneously touch and boiler, motor, Manila escortElectricity and thermal engineering are a grand examination of the main and equipment of the power plant. If you are not careful, you can cause malicious changes such as focus and pipe bursting. Therefore, you must scientifically and fairly control the burden-bearing test process to ensure that the test is carried out safely. This paper combines the test of 100% of the circulating fluidized bed boiler set of a certain factory during the infrastructure adjustment process. The key points of the circulating fluidized bed boiler set of the system are summarized and the furnace system is proposed to adjust the holding method, which is used for reference for the test of the same type of machine set.
(Source: WeChat public number “Circular Fluidized Bed Electricity Generation” ID: xhlhcfd Author: Liu Honghua)
1
Equipment Overview
Inner Mongolia, a 2×300MW pit-hole coal gangue heated electric factory project, the boiler is produced by Oriental Electric Group Oriental Steel Co., Ltd., circulating fluidized beds and Asian boundary parameters, reheating natural circulating boiler in the middle, full-boiled sealing, balanced ventilation, full-steel mount suspending structure, boiler tops with large shells, and light roofs. The boiler feeding system uses a 3-stage 50% BMCR capacity electric speed-regulating pump. There is a PCV valve and an air exhaust valve on each side of the outlet of the boiler heater. Important parameters of boiler are shown in Table 1. The car engine is a 300MW grade manufactured by the Oriental Car Engine Factory, a 300MW grade, a middle heater, a single shaft, dual cylinder and dual exhaust, direct air-cooling, and extraction and condensing type car engine. The car machine bypass system is 35%BMCR high-pressure bypass and low-pressure bypass second-level serial bypass.
2
Shake test targets, contents and methods
See whether the motor regulating system can be suitable for design and operation requests, that is, the motor outlet opening is turned off and the machine unit is thrown to all the loads, the regulation system should be able to quickly and smoothly restore the machine unit’s speed to a fixed speed of 3000r/min, and can effectively control the machine unit’s empty load operation. The machine-set negative load test includes two types: 50% rated negative load test and 100% rated negative load test. Please ask for a 50% rated negative load test before passing the 50% rated negative load test. The test was 50% of the rated load, the car motor speed over-regulated is no larger than 5%, the test was 100% of the rated load, the car motor speed was not very effective for the rated load. The Manila escort emergency security device is movable. At the same time, the motor adjustment system dynamic characteristics are tested through trials and the evaluation of the adjustment system is dynamically adjusted.
After the main generator is turned off, the machine unit and the Internet are de-listed, throwing to all loads, and the parameters of the machine measuring the relevant parameters of the machine unit. The furnace is used to adjust the combustion to help adjust the high and low pressure bypass to meet the working parameters requirements after the machine unit is thrown. After the test is completed, the network conditions should be connected in time. The 50% rated negative load test is relatively simple, and the 100% rated negative load test test is due to the intense industrial changes, and there are many adjustment parameters required, which is difficult to control. This article only uses the 100% rated negative load test as an example to illustrate the problems that need to be paid attention to on the side of the boiler.
The ring cat sounds weakly and strongly. She searched for a while before using the manual shutdown method in the 100% negative test of the flower fluidized bed boiler. Because the heat storage capacity of the circulating fluidized bed boiler is extremely strong, even if the amount of coal is reduced early, a large number of high-temperature materials are still in the furnace to continue to heat up, and the steam pressure is difficult to control. Due to the safety of the machine, the experiment was conducted using the manual BT method. BSugar daddyT is a circulating fluidized bed boilerSugar Baby‘s unique operating method. After BT is touched, the primary air, secondary air, current air inlet and all coal-fed machines on the side of the boiler are locked. Only one air inlet with low output power is operated, and the opening of the air inlet of the platform is reduced to 0. Therefore, for the circulating fluidized bed boiler, BT is the true meaning of the stop.
3
Demand test conditions should be provided
The machine has been able to operate stably with a fixed load. All main equipment and systems are operating out of the operation and coordination. The thermal protection, automatic energy is in operation and normal operation and adjustment. All important monitoring instruments are in a correct manner.
The fuel resistance of the motor is qualified, and each The oil pump joint starts normally, the DEH system passes the static test, and the operation is normal.
The high school pressure main door, speed-controlled door, and oil motor are not stuck, and the closing time meets the request (from the gate to the full closing time is not larger than 0.3s). The main door, adjustment Passed the door strictness test. Passed the speed test and the emergency stop of the machine head are normal.
The main engine is protected by important joints and reliable. All steam extraction counterstops and high-emission counterstops should be closed strictly, the action is flexible and reliable, and the joint movement is correct Normal. The axial seal steam parameter meets the request. The engine bypass system and temperature reduction equipment are in place for the input conditions.
The fuel system of the boiler is circulated to ensure that the fuel system is reliable for the input. All safe valves are fully checked and the action is reliable.
The water level protection of the boiler drum is lifted, and a specialist monitoring of the boiler drum water level is set during the test. The boiler is lifted once and the wind is less than the fluidized wind is protected. The important motor-changing frequency converter on the boiler side can be repositioned in time. Except for the automatic pressure pressure, everything on the boiler side will be automatically lifted.
The diesel generator set has a normal empty load test, the diesel generator set can be used reliably, the automatic lock performance test is normal, it can be put out normally, the negative load test is in the heat condition before the test, and the automatic magnetic adjuster is adjusted. The starter or boiler can be supplied and Sugar baby‘s steam assisted.
The motor bypass system can be put into operation normally, and the motor bypass system should be in the preparatory state. The factory power supply has the conditions for switching and starting the preparatory pressure transformer. The main change outlet switch of the generator and the magnetic switch of the generator are jumped normally, and the power system is powered by the power systemSugar BabyThe pressure and frequency are normal, and reserved capacity is left. A comprehensive inspection of the main equipment and systems of the motor, electric and furnaces is confirmed to confirm that the operating conditions are out and each instrument is correct. Release the generator protect the steam jump signal. Before the test, please indicate the network adjustment. The adjustment verification system has the test conditions and is approved for trial.
4
Debt-sweeping test process
4.1 Prepare tasks 2 hours before the test
The deaerator steam source is switched from the extractor steam to the steam source, and the steam source is switched to a temporary or start-up boiler.
The factory uses power switch to start.
Check to confirm that the machine can operate stably under test load, and the operating parameters of the boiler and motor systems are stable and uneven.
Check and confirm that the high side and low side are in the “manual” method, and the spray water control of the high and low pressure bypass is in the “automatic” state.
Set up and test the high-speed recording devi TC: