SU1325249A1 - Method of controlling the firing of boiler unit - Google Patents

Description

113

The invention relates to a power system and can be used in thermal power plants.

The purpose of the invention is to increase reliability.

The drawing shows a diagram of the implementation of the method.

The circuit contains sensors 1 of the incident radiation flux connected to the maximum signal extraction unit 2, and sensors 3 for the pressure of steam behind the boiler. Outputs of unit 2 and sensor

3 are connected to block 4, the outputs of which are connected to logic unit 5, to the outputs of which are connected the common air controller 6, the burner ignition control device 7 and the fuel regulator 8, and the block 9 is connected to the alarm unit 9

4 divisions

Signals from the incident-radiation flux 1 (q -) installed in the exit window area of the combustion chamber at several points in width are sent to the maximum signal extraction unit 2 (q max.max.). The signals from the outputs of block 2 and sensor 3 according to the vapor pressure behind the boiler (P,) are fed to the block 4 division, which forms the output signal of the vapor pressure ratio — the maximum radiation flux (P / RGN signal

From the power of unit 4, it enters the input of logic device 5, which forms a system of priority control actions on the common air regulator 6, the burner ignition control unit 7 and the fuel regulator 8. A priority is formed depending on the magnitude of the deviation of the magnitude of the RC / Chrome.x about a predetermined value. The signal from the output of block 4 is also supplied to the block 9 of the alarm, which, if it is exceeded by the ratio Rk / Yars, 3.me, wp, of a given value, informs the operator about the possibility of further increasing fuel consumption.

The method is carried out as follows.

After ignition of the first burners of the boiler and connection of the superheater, the rate of increase of the heat load is determined by the need to obtain steam flow, which ensures turbine push and rotate to the nominal speed, and after synchronization of the generator to the required speed. loading the block.

In the case.) If the received schedule of the formations provides the specified ratio P / c R. u.man. "A signal from the output of block 4 does not cause any control actions of the logic device 5. If at some point in time there is a decrease in the value of R / C .glass with respect to a predetermined value, a signal appears at the output of block 4 proportional to the magnitude of the deviation. Logic device 5, perceiving this signal, forms control actions in the next order, based on three

deviation levels, conventionally referred to as small, medium and high. If there is a small deviation, a command is sent to the controller 6 of the total air flow

ha which increases consumption

spirit in predetermined limits, for example by 10%. If, after a predetermined time, the ratio P / q raz.max does not recover or reaches an average level, rfo is given a command to the burner control device 7. To reduce the amount of radiation flux in the exit zone from the furnace, the device 7 is manufactured by, for example, turning off part of the upper rusher burners and turning on part of the lower r.

If the max. Ratio is restored or reaches a high level, device 5 sends a command to the fuel consumption controller, reducing fuel consumption in steps until the desired ratio p Emax is reached.

If the value of the ratio of R / C z z z z z o l. Z oax stably exceeds the preset value, the signaling unit 9 informs that according to the specified parameter there is no prohibition to increase fuel consumption

Claims (1)

Invention Formula The method of controlling the start-up process of a boiler unit by changing the fuel and air consumption in a furnace with screen surfaces equipped with burners located on several tushes along the height of the furnace, determining an indirect parameter characterizing the rate of change of heat3 comparing it with specified ones, so that it is measured in order to increase reliability, the magnitude of the incident radiation flux on the screen surfaces located in the exit zone of the furnace and the vapor pressure behind boiler, calculate the ratio of vapor pressure behind the boiler to the value of the radiation Editor I.Nikolaychuk Order 3036/33 Compiled by Y. Bulkin Tehred L. Serdyukova Proofreader A.Ilin Circulation 387 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 as the indirect parameter, depending on the deviation of the parameter from the given one, first increase the flow rate of air supplied to the furnace, then affect the distribution of fuel and air through the burners troughs, and then reduce the fuel consumption.