JPH0693806A - Start-up and shut-down system for power plant by use of computer - Google Patents

Abstract

PURPOSE:To minimize the starting-up loss by computing the starting-up loss to the present time, and schedules of subsequent events and the estimation of the starting-up loss at every event during a starting procedure so as to cor rect the subsequent starting-up and shutting down times of equipment. CONSTITUTION:A counter 27 is used for determining whether the present process is effective or not. The nature of heat is sorted in accordance with the determination of an input heat value at step 28, and if the heat is transmitted from another system, the input of the heat is soon stopped at step 29, and the time of a corresponding process is advanced by a DELTAt at step 30. Otherwise, the time of the corresponding process is delayed by the DELTAt at step 32 in order to delay the time of initiation of the consumption of the heat at step 31. If the time cannot be punctual, when the counter set at zero step 36, the original schedule is corrected and then progressed at step 37 since the schedule cannot be corrected. If the counter is not set at zero, the subsequent schedule is corrected and advanced with the use of an i-th result at step 38. Thus, it is possible to minimize the starting-up loss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer-based start / stop system for a power generation facility composed of a boiler, a steam turbine, a generator and associated accessories.

[0002]

2. Description of the Related Art The start-up of power generation equipment, which is composed of a boiler, a steam turbine, a generator and related auxiliary equipment, proceeds uniformly to keep a target parallel time. Therefore, the loss at the time of startup was almost the same.

[0003]

As described above, the start-up of the power generation equipment, which is composed of the boiler, the steam turbine, the generator and the related auxiliary equipment, proceeds uniformly to keep the target parallel time. There was a problem that it could not be changed after booting started. For each event, the scheduled time of each event up to parallel is recalculated, and the start / stop schedule of each device is changed so that each event time is kept and the operating time is minimized. The challenge is to minimize

[0004]

The feature of the present invention is to calculate the starting loss up to the present and the schedule of future events and the prediction of the starting loss for each event in the starting process so that the starting loss is minimized. First, it is to correct the start / stop time of future equipment.

[0005]

According to the present invention, it is possible to minimize the starting loss when starting the power generation equipment.

[0006]

EXAMPLES Details of examples will be described below.

FIG. 1 shows an example of a flow chart of starting up the power generation equipment up to parallel. Power generation equipment is seawater system startup 1, condensate system startup 2, condensate cleanup 3, condensate demineralizer startup 14, deaerator water filling 5, low pressure cleanup blow 6, condenser vacuum rise 7, low pressure clean Up circulation 8, water supply pump water fill 9, high pressure heater water fill 10, high pressure cleanup 11, boiler water fill 12, boiler cleanup 13, water supply pump start 14, ventilation system start 15, ignition preparation 16, ignition 17, temperature rise boost 18, The high-pressure turbine warming 19, the control valve warming 20, the ventilation 21, the speed increase 22, and the parallel 23 are provided. Here, in order to reduce the start-up loss up to parallel, the time from start-up to parallel is minimized, but in the past, the schedule from start-up to parallel was uniform, so start-up loss was also determined by it. It was a value.

FIG. 2 shows how to determine the amount of start-stop loss at any time t of start-stop loss. First, the loss amount from the disconnection time to the time t at an arbitrary time t is Q _Ai * (t-tk) + W _Bi * K _W * (t-tk) + F _Ci *
It is calculated by (t-tt). The value of the remaining start-stop loss from arbitrary time t to parallel is Q _Ai * (th-t) + W _Bi * K _W * (th-t) + F _Ci *
It is calculated by (th-t).

Here, Q _Ai (24) is the heat input from the other system,
W _Bi (25) is loss due to auxiliary machinery during operation, and F _Ci (26) is loss due to fuel consumption.

From FIG. 2, it is necessary to advance all the time after that in order to minimize the amount of start-stop loss after an arbitrary time t, but since the parallel time cannot be moved, it is shown in FIG. The time of the event after the time t is corrected based on the flowchart.

FIG. 3 shows how to set the time of an event after the current time.

The counter 27 is used to determine whether the processing is valid. The nature of the heat quantity is classified by the heat input quantity judgment 28, and if the heat input quantity is from another system, the heat input is quickly cut off 29, and the corresponding operation time is advanced by Δt 30. Otherwise, in order to delay 31 the start of consumption of heat, the corresponding operation time is delayed 32 by Δt. Therefore, the schedule is recalculated 33, and if the schedule is covered by the time corrected by Δt, the 34 counter 35 is counted up, the time is further corrected, and the recalculation is performed. If the time cannot be kept, or if the counter is 0, 36, the schedule cannot be corrected, and the schedule is advanced to the original schedule 37. If the counter is not zero, then the i-th result is used to modify and advance the future schedule 38.

[0013]

According to the present invention, it is possible to minimize the starting loss when starting a power generation facility.

[Brief description of drawings]

FIG. 1 is a flow chart of an embodiment of the present invention.

FIG. 2 is a diagram showing how to determine a start-stop loss amount.

FIG. 3 is a diagram showing how to set the time of an event after the current time.

[Explanation of symbols]

1 ... Seawater system startup, 2 ... Condensate system startup, 3 ... Condensate cleanup, 4 ... Condensate demineralizer startup, 5 ... Deaerator water filling,
6 ... Low pressure clean-up blow, 7 ... Condenser vacuum rise,
8 ... Low pressure cleanup circulation, 9 ... Water supply pump filling,
10 ... High-pressure heater filled with water, 11 ... High-pressure cleanup,
12 ... Boiler water filling, 13 ... Boiler cleanup, 1
4 ... Water pump start, 15 ... Ventilation system start, 16 ... Ignition preparation, 17 ... Ignition, 18 ... Temperature rising / pressurizing, 19 ... High pressure turbine warming, 20 ... Control valve warming, 21 ... Ventilation, 22 ... Accelerating, 23 ... Parallel, 24 ... Loss due to heat input from other system, 25 ... Loss due to auxiliary machinery during operation, 26 ... Loss due to fuel consumption, 27 ... Counter, 28 ... Judgment of heat input,
29 ... Process of quickly cutting off heat input, 30 ... Process of advancing the time of the corresponding operation by Δt, 31 ... Process of delaying the start of consumption of heat, 32 ... Time of the corresponding operation of Δ
Processing to delay by t minutes, 33 ... Recalculation of schedule,
34 ... Judgment whether the schedule is protected, 35 ...
Counter, 36 ... Processing for determining whether the counter is 0, 3
7 ... Process for advancing according to the original schedule, 38 ... Process for correcting the future schedule by using the i-th result.

Claims (1)

[Claims] 1. A steam generator comprising a boiler, a steam turbine, a generator and related auxiliary equipment, and a start-up of a power generation facility by a computer, which is controlled so as to minimize a start-up loss at the time of start-up. Stop method