SU63741A1 - Three-pulse steam boiler power controller - Google Patents

Description

The existing three-pus power supply boilers of steam boilers with the transfer of adjusting impulses to the actuator by means of membranes and diaphragms are very complex and have a significant I1H1 output, so that they cannot keep the level in the boiler drum in a given range.

The proposed Pitad regulator eliminates this drawback and liMeeT is a distinct special guest that for supplying the working fluid to the servomotor of the feed valve P1 example the throttle auxiliary valve 1H, controlled by the 1st lever, simultaneously under the influence of all three adjustment pulses: pressure, steam consumption and water level in the boiler drum.

The drawing shows schematically the controller and the scheme of its inclusion.

As a working fluid for the servomotor, p: test water from the same pipeline is used, which is equipped with a boiler supporting column (regulator and valve).

The water flow is measured with a washer 1 installed on the supply pipe behind the control valve, with the impulse being transmitted by tube 2 connected in front of the washer and tube 3 of the boiler drum. The error from the fact that the tube 3 is not the adventure behind the puck, but to the water part of the drum is small; it is equal to a certain constant (GH) value, not exceeding a few hundredths of a millimeter of a water column with a 1.5–2 atmospheric differential.

The flow rate naipa is measured by the difference at the measuring washer 4 installed on the bypass 5 connecting the suction bowl to the superheated steam collector. Steam consumption in this circle is very small. therefore, the danger of overheated vapor cooling and precipitation in a significant amount of salts is eliminated. The impulse is transmitted by tube 6. with the hook 4. connected and tube 3 from the water part of the boiler drum. The error in this method of taking a pulse is insignificant, since the pressures in the drum and the steam chamber are almost the same.

and fluctuates within 100-200 mm of water. Art., which is relative to 1.5-2 atm. The difference is 1%. In general, you can do without the washer 4 bypass, 5 and measure the over pressure between the drum and the superheated steam collector. The inconvenience in this case is that it is necessary to work on a full cover, while on the bypass, having 15entyl, it is possible to regulate the difference,

Im1pu: 1c by papava 18 and water 3 tubes.

Thus, there is one common tube 3 for flow meters, a pair; water and regulator level. This allows for; 1; 1; a cavity 8 common to all of;; test organs; and summing the movements of the three pulsed organs and the effect on valve 11 without sa: 1 liquefies; trein and reduce the sensitivity of the regulator.

The pressure difference in cavity 7 above the membrane and in cavity 8 characterizes the level in the drum of the boiler, forcing the membrane to move in one direction or another, depending on the change in the level k, to provide 1X) throttle auxiliary valve I.

The pressure difference in cavity 8 and in spaces 9 and 10 is characterized by a corresponding flow of water and steam. Due to the changes in this difference, the niTocks of the membranes 15 and 16 are moving and the valve P. is affected.

The rods of all membranes are connected (on a ball or on prisms) with a common) lever 17, which is connected to: n also valve 11 of the regulator. Depending on the change in the level and flow of steam and water, the position of the lever 17 and, consequently, the valve 11, which is throttle and balanced, is measured so as not to cause additional effort. Differential pressure at the valve should be limited to 5-10 atm., Since a greater differential will cause rapid wear of the valve.

In accordance with the Layer-1-1 valve valve 11, a pressure is created in chamber 12, depending on the degree of opening of the upper cone and closing of the lower cone of valve 11. This pressure is transferred to the piston 13 of the servomotor, acting in one direction with the reinforcement, Springs 14 and equilibrating pressure nutrient voddy supplied to the other side of the yurshp. At a certain pulse pressure pressure, the servomotor thurapei 13, having overcome the resistance of these springs, is in its extreme upper position. When we increase the pressure of the piston, the servomotor 13 will go down and under the greatest pressure it will be in the extreme lower position. The change in pressure of the one-piece water acting on the bottom surface of the core is not supernatural, because the piston, although it moves, changes the valve opening, but the changed water flow will disturb the equilibrium of the regulator, which will cause the piston to move to the appropriate position.

When the steam flow rises, the difference between the washers 4 will increase, the membrane 16 will open and the rod will lower, point A will move up and lever 17 will rotate around TC, which will remain fixed at this time. Valve 11 will go down and pulse pressure will decrease, as the upper cone will reduce the flow of oxen. and the bottom will increase the reset.

Reducing the impulse pressure will cause the servo motor to move upwards, slightly open the clan, and increase the water supply to the boiler. As the piston moves upwards, the spring 14 will compress, and there will be a moment when the spring force and the new pulse pressure balance the pressure on the other side of the piston.

As the water flow rate changes, the difference in washer 1 changes. Membrane 15 is compressed, the rod. Signifies to move downwards, at the same time turning lever 17 around point L in a clockwise direction. At some point, when the steam-water ratio is restored within a certain non-uniformity, this movement will stop.

Valve I will take some new position, according to which the pulse pressure will be established behind the valve, the position of the servomotor and the opening of the valve. If the water enters the boiler more than necessary, and the level in the drum starts to rise, then the membrane of the level gauge rises. The top n will move the valve 11 in the same direction. The impulse pressure will increase and the piston of the servo motor moves up and down respectively, closing the valve.

It should be noted that the schematic depiction of the ephyo controller does not prejudge its construction.

Some omissions have been made in the scheme, which will not be used during the development of the framework. For example, the power principle of coupling steam and water flow meters is shown, while the kinematic one will be more advantageous. There is no device with which you can manually act on the valve 11 of the regulator and the equalizer of the steam, water and level gauges. Not shown a device with which you can limit the pressure drop at the valve, etc.

In the event of a regulator coming out of

When the valve is closed, it is possible to switch to manual control by another valve, since the lack of water will cause the pressure pulse to drop to zero and move the servo to the upper position. The valve is fully open. Having freed the cavity 8 from water, it is possible to repair the regulator. Installation; A boiler controller will increase the reliability of its operation and greatly facilitate the automation of boiler plants, laK as in this case, a complex node like powering will fall out of the control circuit. This will enable a more direct front to introduce auto-regulation of boiler burning.

The subject is invented and

Traps IIulk power regulator of new boilers with the transfer of regulating gears to the performers through the other membranes and diaphragms, the throttle valve is used to supply the pa6o4eii fluid to the servomotor of the feed valve. controlled by a lever simultaneously under the influence of all three adjusting pulses: pressure switch. steam consumption in the boiler drum.