SU1292106A1 - Method of controlling fuel-fired steam plant load when it is assigned for isolated operation in emergency conditions - Google Patents

Abstract

The invention relates to energy. The invention allows for reliable operation of the power station equipment 19. When installed with an excess of electric power, electric boilers 10 are turned on first. If this effect is insufficient, steam flow to regulated heat extraction 7 is increased and steam flow to condenser 6 is reduced by covering the regulator 19. The degree of cover of the latter is determined by the composition and operation mode mechanical equipment. The opening of the reduction cooling unit 13, leading to the slowest change in steam consumption, is implemented last. The release with a deficit of active power is accompanied by the shutdown of electric boilers 10. By dispensing the regulator 19, restrict the supply of steam to take 7 and increase the flow of steam to the condenser 6. In case of insufficiency of these measures, reduce steam admission through the installation 1 3. 2 Il. With 1C

Description

The invention relates to energy and can be used to ensure the survivability of thermal power plants, producing a combined generation of electrical and thermal energy with a wide range of load variation - thermal power plants with increased maneuverability (TETSGO), with severe systemic accidents with deep reductions in frequency and voltage, when the real loss of one’s own needs and repayment of the most responsible consumers arises.

The purpose of the invention is to ensure reliable operation of the station equipment.

Fig. 1 is a schematic diagram of a power generating unit of the TPPM; Fig. 2 is a block diagram of automation for the implementation of the proposed method.

The TEC contains a steam generator (steam generators) 1, connected by pipelines 2 of fresh steam to a turbine (turbines) 3, consisting of parts 4 and 5 of high and low pressure (CVP and PND). PND 5 communicated with the condenser 6, and to the heat extraction selections 7 of steam from the turbine 3, network water heaters (sing) are connected. Electric water boilers 10 connected to generator voltage buses 11 are connected to supply water line 9 before PSV 8, and additional boiler plants (DBU) 12 connected through steam through reductive cooling plants 13 to pipelines 2 are connected after PSV 8. fresh steam. The generator (generators) 14 is connected to a transformer (transformer) 15 that feeds the consumers 16, separated by section 17 of the division. The steam generator 1 and the turbine 3 have regular regulators 1B and 19,

The block diagram of the automation contains a block 20, which is a device that reacts to a decrease in frequency and voltage on the tires 11 and generates a signal for division, and the block 2 for measuring the magnitude and sign of the total active power flow over the 17 section of division. The outputs 22 and 23 of the blocks 20 and 21 are connected to the block 24 of the dosage of impacts, which receives the signals about readiness to participate in emergency control from electric boilers 10 and DCC 13. Output 25 of the block 2.4 is connected

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with inputs 26–28, blocks 29–31. Block 29 realizes switching on or off of electric boilers 10, block 30 opens or closes DOC 13, and block 31 controls the regulator (diaphragm BHF 5) 19.

Depending on the mode at the time of the occurrence of the accident, it is necessary to take various measures to control the electrical capacity of the TPP. The nature of the impact (decrease or increase in generation) is determined by the direction of the total power flow across section 17 of the division, and the method of effecting the action depends on the magnitude of the unbalance, composition, and mode of the equipment ready for participation in emergency control. If separation occurs with an insignificant unbalance (for example, less than 10% of the power of the separated equipment), balancing is usually satisfactorily carried out due to the action of the nine regulators 18 and 19 of the turbines 3 and the steam generators 1. With more significant imbalance, additional actions are required on equipment TECPM.

In the pre-accident mode, the power of the generators of 14 TPPs is significantly greater than the load of their own needs and the consumers of the 16 allocated area. In this case, the frequency in the separated area increases, which leads to the closure of the standard regulators (control valves) of 18 turbines 3. Significant and quick closing of control valves 18 is abruptly yMeHbmaef steam generating capacity of steam generators I, which can lead to their shutdown by technological protections. To prevent the development of an accident, an emergency response is carried out.

control of electric boilers 10, heat extraction 7 turbines 3 and DOC 13 in such a way as to ensure the smallest frequency deviation in the separated area with limited disturbances of the initial mode of the steam generator I. In order to implement emergency boilers as soon as possible, the disabled electric boilers are turned on first 10. In case of insufficiency of this effect, steam admission to the regulated heating extraction 7 increases,

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The passage of steam into the condenser 6 is reduced (by covering the diaphragm 19 of a PND 5). The permissible degree of cover of the diaphragm 19 is determined by the composition and mode of operation of the thermomechanical equipment. The opening of DOC 13, leading to the slowest change in steam consumption, is the last occurrence. These measures lead to a decrease in the generation of electric power with a small change in steam generator steam consumption 1. As a result, the deviations of the technological parameters are small and the functioning of the equipment isolated for the isolated operation of the equipment is quite reliable,

Overheating of the mains water due to the significant inertia of the heating circuit 9 increases rather slowly and can be tolerated under emergency conditions.

Consider the situation when, in the pre-emergency mode, electric power

The load of the Bbmej neMoro region is greater than the power of the generators 14 ТЭ1ЩМ (power flow across the cross section 17 division is directed towards the station. To prevent a significant reduction in frequency, it is necessary to force the electric power developed by the generators 14, which is most quickly accomplished by turning off the electric boilers 10 and metered open the diaphragm 19 PND 5, due to which the steam supply to the heat extraction selection 7 is limited and the steam transmission to the condenser 6 of the turbine 3 is increased. If these measures are insufficient It is necessary to reduce steam admission through DOC 13 in operation. All measures aimed at mobilizing electrical power of TPPPM are associated with underheating of network water, which can be allowed under emergency conditions. In practical implementation of the method, it is necessary to monitor the current state of turbines 3 electric boilers 10 and DOC 13 to determine the feasibility and permissible degree of their involvement in emergency control. Electric boilers 10, district heating plants 7 and DOC 13 intended for heating network water are used for emergency Ini the active power control TPTsPM

this determines the predetermined order of their use.

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It is advisable to prepare all the necessary load balancing operations prior to release. The signal for alarms, formed on the basis of information about the emergency frequency reduction and voltage, triggers the previously prepared signal. program. Since balancing generation and consumption can be carried out approximately, it is sufficiently limited to two or three steps, respectively, of unloading and loading the power plant.

In the event of an emergency situation requiring the TPPM, the unit 20 is triggered. Its output 22 enters the effect dosage unit 24. On the basis of information about the flow of active power in cross section 17 and readiness to participate in emergency control of electric boilers 10, DOC 13 and turbines 3, coming to block 24, the emergency control program is recalculated in the latter period with a given period. However, the program calculated in the pre-emergency mode is transmitted to the inputs 26-28 of the blocks 29-31.

Claims (1)

Invention Formula The method of regulating the load of a thermal power plant when it is used for isolated work under emergency conditions by generating electricity, simultaneously supplying heat from the network water heated by steam from the turbine extraction units reduced by steam from the power-cooling units and by electric power from the power plant to the power plant. unbalance modes of electric power and load distribution between consumers, depending on their pre-emergency mode of operation, characterized in that To ensure reliable operation of the equipment of the power plant, unbalance is distributed between those electric boilers, turbines and reduction and cooling plants, from which readiness signals are fixed, while turning on the electric boilers with excess, then increasing the steam supply from the heat extraction samples and if necessary, a reduction supply 512921066 when released, a deficit of steam supply with a deficit first disconnects from the heat extraction and closes the electric boilers and then follows a series of cooling equipment. / eleven PI P2 Pn