SE447417B - PROCEDURES BY INCREASE STEP CONNECTOR - Google Patents

Description

447 417 have time to steer down, as the boiler suddenly loses half the water rlöaet. in 2. If the automatic selector is controlled by power measurement, the optional the boiler does not, because the cold plug gives a power reduction signal, then the boiler shall be disconnected. If you want to get the boilers started, then "steal" the boiler (s), which receives the least water due to differences of pressure drop in pipes and internally over the boilers.

These disturbances cause inconveniences, which always lead to voters the nutomatics are bypassed, and the boilers are run separately and the staff determines the number of operating boilers as required.

The purpose of the method according to the invention is to eliminate these disadvantages, especially the causes of malfunction.

The method according to the invention is characterized by what appears from attached claims.

The invention will now be described in more detail with reference to the appended claims. drawings, where Figure 1 shows a control and distribution system system for a multi-boiler control panel with automatic switching on and off as needed and Figure 2 shows a bar graph of power for four boilers.

Figure 1 shows a boiler plant comprising four 15MW boilers P1, P2, P3 and P4, i.e. total power 60 MW. The boilers can regulate 1: 5, i.e. 20-100% of 15 MW. On the automatic selector 1, which consists of one conventional PC system and programmed according to required digi ~ speech and analog signals and there is the possibility to by-fit desired boiler (boilers) from the programmed selector system, you can optionally select first, second, third and fourth pan, the first pan also is called the basic load boiler and the other optional boilers. Blocked forehead is automatically replaced by the next in line boiler. To control the flow through the boiler, the "pump-controlled water" method has been selected, whereby each boiler P1 - P4 is equipped with its own boiler pump Pu1 - Pu4 and parallel A corresponding non-return valve BV1 - BV4 is arranged above this.

The boiler valve P1 "of the first boiler P1" is full when the boilers are shut down open and other boilers P2 - P4 throttle valves P2 "- P4" are closed da.

The first boiler P1 starts, when a shunt valve 3 opens and automatically the bitch registers start-motivated flow. The boiler pump Pu1 is not running, the throttle valve P1 "is fully open, the corresponding burner P1 'is regulated .ffx -nx 447 417 of the outlet temperature of the boiler. Here a power meter 2 registers 15 MW ($ 100), starts second boiler P2 with closed throttle valve P2 " and burner P2 'load on low load. When the boiler water temperature approaches setpoint temperature, gives the boiler power regulator> "reduce impulse", whereby the throttle valve P2 "opens a" snap " flow through the boiler, which causes the outgoing temperature to decrease, wherein the controller provides "boost impulse", which exposes burner control and thus increases burner capacity. At the next "decrease impulse" opens the throttle valve again a "snap" and the flow increases etc.

For each "open-snap" of the second boiler P2 throttle valve P2 " the flow of the first boiler P1 is reduced to a corresponding degree and its burners are downgraded accordingly. When the first boiler P1 through has been reduced to 65% power, read the burner control and the boiler pump Pu1 starts and the outgoing boiler temperature now controls in its throttle valve P1 "and opens the throttle valve of the second boiler P2. to P2 "full, the outgoing temperature of the second boiler only controlling its burner control. If the power requirement increases (shunt valve 1 gives more water), increases the power of the second boiler P2. If this entails, that second boiler is upregulated to 100%, the 65% reading is exposed at first boiler by opening its throttle valve P1 "and releasing burner control, until this (first boiler) has reached 100% efficiency effect, whereupon the burner control is locked again and its output temperature control of the throttle valve P1 "and the boiler pump Pu1 still is running. With continued increasing power requirements and next time the second boiler achieves $ 100 power, you connect the third boiler P3 and the same process major is repeated, with the second forehead playing the same role as the third the forehead as before the first forehead opposite the second forehead. It is economical more advantageous to run two boilers at high load than three boilers on reduced load.

When power is reduced, the process takes place in reverse, i.e. last connected boiler gets rid of its water because its boiler pump is not running and the previous boilers receive controlled pump-controlled water. Sist in- connected boiler goes out at 20% power and rising temperature of its outgoing temperature. Then the previous pan becomes the last pan and its boiler pump is stopped, its throttle valve opens fully and its outlet temperature only controls the burner control.

In summary, it can be said that 1 previously connected boilers are power locked at 65% resp. 100% ef- effect and its outgoing setpoint temporutur konnanthålleu, by 447 417 this temperature controls its own inlet via boiler pump and throttle valve. _2 last connected boiler takes up the variations of the network, emeäan its throttle valve is fully open and its outlet temperature controls the fuel narregelsen. The last 3 boilers are switched off at 1.5 MW lower power (10% of the boiler ïekt) than it was switched on, which gives high boiler operation continuity.

The bar graph in Figure 2 shows a base load boiler P1 + three select panels P2, P3 and P4 with seven power stages. The invention is of course not limited to this embodiment but can of course be varied within the scope of the inventive concept.

Claims (1)

'in 447 417 P A T E N T K R A V 1 Procedure for step-by-step connection of at least two heating boilers connected in parallel in a central heating plant, where a first boiler is in operation, if the need only requires it, and where a second boiler is connected if necessary in addition to the company's capacity, etc. with more than two boilers, characterized in that, when the heat supply of the first boiler does not fill the need, a second boiler is put into operation and regulated to a temperature acceptable for combustion by regulating the burner, while the burner of the first boiler is regulated down to about 65% of full power and is kept constant at this value and the flow through the first boiler is controlled in such a way that a constant outgoing water temperature from the boiler is obtained. A method according to claim 1, characterized in that it. the first boiler is operated with constant full power and regulated flow and the second boiler regulates the heat demand by controlling the burner, as the second boiler's burner control seeks to increase in addition to full power 5 Procedure according to claim 2, characterized in that a third boiler is put into operation and regulated to a temperature acceptable for combustion by regulating the burner, while the first boiler is kept constant at full power and the second boiler is kept constant at eza 65% power 4 Process according to claim 3, characterized in that the second boiler is run with constant full power, when the heat supply of the first pen at full power, the second at about 65% power and the third at full power is not sufficient to meet the heat demand. A method according to claim 4, characterized in that a further boiler is put into operation and its temperature is regulated with its burner, while the first and second boiler are kept constant at full power oeh d a third boiler is first kept constant at about 65% power and when this is not enough, i.e. when the fourth boiler seeks to increase its power beyond 100%, the third boiler is operated at a constant full power 6 Method according to claim 1, characterized in that the second boiler is started with a closed throttle valve and burner on low load 7 method according to claim 1, k characterized in that switching on and off of boilers is carried out by means of power overlap.