DE102007031134B3 - Heat generator i.e. boiler, controlling method for power center, involves charging outlet cycles over overflow valve arranged between flow pipe and supply line, where valve is opened and closed depending on differential pressure in valve - Google Patents

Abstract

The method involves opening out of a flow pipe for optimizing an operation of a boiler (24) in two supply lines. A heat supply of outlet cycles (16, 18) is performed over a switching valve that is arranged in one of the lines. A buffer storage (14) is loaded over another line depending on an outlet cycle-dependent valve adjustment of a heat regulation valve. The cycles are charged over an overflow valve that is arranged between the flow pipe and the latter line, where the overflow valve is opened and closed depending on differential pressure formed in the overflow valve. An independent claim is also included for a power center with a heat generator.

Description

The The invention relates to a method and an energy center with the in the preamble of claim 1 and 3 mentioned features.

From the EP 0 384 423 B1 or even the DE 43 01 723 C2 It is known to form hot water tank as hot water stratified storage. In such hot water storage hot and especially hot water is kept ready so that it can be removed if necessary. The removal takes place, for example, in a heat exchanger to carry out a heating of just needed hot water, if this is required in the kitchen or bathroom or to be supplied for example directly to a heating circuit for space heating. The correspondingly cooled by water is then returned to the hot water tank. On the other hand, heated water can be supplied, for example from a solar circuit.

In the space designed as a hot-water stratified storage layer itself due to the natural Density differences the water so that the warmest water with the least Density is at the top and the coldest water is the highest density below. hot So water can be tapped up.

today known systems have a hot-water stratified storage, on the one hand of a solar heat generator cycle and on the other hand loaded by a conventional heat generator cycle becomes. Instead of the conventional heat generator cycle can of course, too a district heating circuit as a heat source serve and be connected to the hot water stratified storage. The Acceptance takes place via at least one customer cycle.

at Most plants are usually the hot water stratified storage on the Flow of the conventional heat generator cycle directly loaded. At the same time, the solar heat cycle feeds existing energy Heat in the hot water stratified storage. The supply of the customer cycle [Heating and / or service water] with hot storage water is mostly by removal over at least one customer cycle from the hot water stratified storage directly instead.

These Procedure has the particular disadvantage that a direct Control engineering coordination between the conventional heat generator cycle and the at least one customer cycle does not occur, as always the hot water stratified storage is interposed.

This As a result, inefficiently always first certain amount of heat is discharged to the hot-water stratified storage, which optionally has a other circuit, for example, the solar heat cycle, fed could be.

Further arises especially in the summer partial load operation in which the decrease in the customer cycle is low and also fluctuates greatly, that the heat generator the conventional heat generator cycle in a "clock mode" passes, in which he depending on Heat loss of the Customer cycle clocks, so is switched on and off. These Driving style is economical and environmental reasons inefficient.

Of the Invention is based on the object, a method and an to the Process of plant-technically coordinated energy center with a Arrangement of fittings; To offer measuring equipment and lines etc. by means of a decrease generated in the heat generator cycle heat can be tuned to a decrease in the customer cycle, wherein achieved should be that always a sufficient supply of the hot water tank or hereinafter referred to as a buffer storage heat storage guaranteed is.

The Energy center comes with a heat generator and an associated one Heat generator cycle designed, the supply line to a buffer memory, in particular Buffer layer store communicating with at least one Customer cycle is connected.

According to the invention Supply line for optimizing the operation of the heat generator formed into a first and second feed line to both a direct heat supply the at least one consumer circuit via a in the second feed line arranged switching valve as well as a loading of the buffer memory over the first feed-in line depending on a customer cycle dependent Valve position of a heating control valve, the at least one Customer cycle over a between supply line and the, in the buffer memory opening, to ensure the first supply line arranged overflow valve.

In Preferred embodiment of the invention, the spill valve is a with or without external energy controlled valve.

If the overflow valve is a valve controlled without external energy, the system is driven in this line region of the energy center in response to a differential pressure which forms at this overflow valve, with the valve being connected to opens increasing differential pressure and closes again with falling differential pressure.

is the overflow valve a controlled with external energy valve, it will work together with the other to be controlled and / or regulated valves of the power station in a control and regulation system of the energy center with a, as with the energy-free heating control valve resulting control behavior integrated analogously.

Prefers shows the power station next to the conventional heat generator cycle another heat generator cycle as solar heat generator cycle on, by means of the buffer also with heat energy is loadable.

The The invention also relates to the associated method, which starting from the power center according to the invention with a heat generator and an associated one Heat generator cycle, whose Supply line with a buffer memory, in particular buffer layer memory, communicating with at least one customer cycle is performed as follows becomes.

The in the at least one consumer cycle required amount of heat is done by loading the buffer memory from which the at least one customer cycle the needed Amount of heat takes.

The Flow line opens for optimizing the operation of the heat generator in the first and second Feeding line to provide both a direct heat supply of at least a customer cycle, about arranged in the second feed line switching valve as also a loading of the buffer memory via the first feed line in dependence the customer cycle dependent valve position the heating control valve, the at least one consumer circuit via a between the flow line and the first feed line arranged overflow valve, which is dependent one at this overflow valve forming differential pressure opens and close, to ensure.

In a partial load operation of the customer cycle is heat dissipation to the cache over the first feed line, thereby extending the life of the heat generator realized and a timing of the heat generator is avoided.

hereby Overall, a more efficient driving style of the energy center is achievable.

The Loading over the first feed line of the buffer memory, preferably as Buffer layer memory is formed, is preferably carried out in the upper defined volume range of the buffer memory.

there the loading of the buffer tank takes place via the first feed line in dependency of customer cycle dependent Valve position of the heating control valve of the at least one consumer circuit via the between the flow line and the first feed line arranged overflow valve as long as arranged at one in the upper region of the buffer memory temperature sensor a predetermined threshold is reached, after which a switch the switching valve, a withdrawal line of the buffer memory to which at least one consumer cycle is opened, wherein at the same time a shutdown of the heat generator effected is.

The Invention will be described below with reference to an embodiment and the accompanying figures explained in more detail. It demonstrate:

1 an energy center;

2 a circuit diagram of the energy center.

The 1 shows a basic overview of a possible embodiment of an energy center 10 in which an associated control method for a boiler 24 is executable.

The energy center 10 includes a heat generator cycle 20 and at least one customer cycle 16 . 18 , As a customer cycle 16 is for example a heating cycle and as a customer cycle 18 For example, a service water circuit to the power plant 10 connected.

In addition, can to the power station 10 another heat generator cycle, a solar heat cycle 12 be connected.

In the center of an energy center 10 is usually always a buffer memory 14 arranged as a link between the optionally arranged solar heat generator cycle 12 , the heat generator cycle 20 with a heat generator 24 and the at least one customer cycle 16 . 18 acts.

Out 2 becomes the central arrangement of the buffer 14 can be seen, in the present embodiment as a buffer layer memory 14 is executed.

The wiring diagram shows the optional solar heat generator circuit 12 , the heat generator cycle 20 that was about a cauldron 24 as a conventional heat generator next to the Solaran able to generate the amount of heat within the power plant 10 serves.

The wiring diagram also shows the customer cycle in detail 16 as a heating circuit and the customer cycle 18 as a process water circuit.

The in the powerhouse 10 arranged wiring and the necessary fittings are in the embodiment between the heat generator circuit 20 and the customer cycle 16 , a heating circuit, provided.

However, this arrangement of the lines and fittings can equally between the heat generator circuit 20 and the customer cycle 18 , the process water circuit, are arranged, with the possibility also exists, both customer cycles 16 . 18 to be controlled via an additional connecting line so that both customer cycles 16 . 18 are mobile according to the method described below.

For the sake of clarity, however, the method according to the invention is only based on the circuit between the heat generator circuit 20 and customer cycle 16 , the heating circuit, described.

In a full load operation of the heating circuit 16 is the heating control valve 16-1 opened and the way 16-1 / A-AB open. The heat supply of the heating circuit 16 via a supply line 20VL and a changeover valve 20-1 , which in this operating condition over the way 20-1 / AB via a second feed line 20VL-2 in the heating cycle 16 is switched as a customer cycle.

The overflow valve 20-2 is completely closed in this operating state.

Especially in partial load operation, where the decrease in the heating circuit 16 is low or strongly fluctuates, it would come to the state of the art with this circuit by the fluctuations, especially in the range of low heat loss, the clock mode of the boiler 24 ,

This timing leads to significant deterioration of the boiler efficiency by constantly switching off and on "clocking" of the heat generator 24 ,

To avoid the clocking of the boiler 24 becomes the supply line 20VL in a first feed line 20VL-1 and in the second feed line 20VL-2 divided up. The first feed line 20VL-1 has an overflow valve 20-2 on, with the first feed line 20VL-1 in the buffer memory 14 , in particular in the upper volume range of the buffer memory 14 ends. The second feed line 20VL-2 runs to the changeover valve 20-1 ,

The overflow valve 20-2 is initially fully closed in full load mode.

In the mentioned with respect to the operation of the power plant more difficult part-load operation, the heating control valve 16-1 starting from full load operation from its position with the way 16-1 / A-AB close and the way 16-1 / AB at least partially open. By opening the way 16-1 / AB the pressure in front of the overflow valve changes 20-2 in the supply line 20VL ,

By doing so in front of the overflow valve 20-2 thus building pressure is dependent on the customer cycle dependent valve position of the heating control valve 16-1 the first feed-in line 20VL-1 opened, allowing a loading of the buffer 14 depending on the at the overflow valve 20-1 forming differential pressure Δp is guaranteed.

The respective differential pressure .DELTA.p is formed between boiler pump suction and discharge side, this differential pressure equally at the supply line 20V1 or the first feed line 20VL-1 in front of and behind the overflow valve 20-1 is present (see 2 ). The intermediate buffer 14 it does not change anything about the differential pressure ratios.

The loading of the buffer tank 14 depending on the customer cycle dependent valve position of the heating control valve 16-1 in the heating circuit 16 about that between supply line 20VL and the first feed line 20V1-1 arranged overflow valve 20-2 takes place until a specifiable threshold value has been reached at a temperature sensor ts6.

This predefinable threshold value ts6 is dependent on the outside temperature on the flow temperature of the heating circuit 16 educated. When the predefinable threshold value is reached, the switching valve is switched over 20-1 , creating a sampling line 16VL-1 starting from the buffer memory 14 to the heating circuit 16 is opened. At the same time the shutdown of the heat generator takes place 24 and the overflow valve 20-2 closes, as a flow-side differential pressure from the flow line 20VL which is higher than the pressure behind the overflow valve 20-2 no longer applied. The heat energy is removed from the buffer tank 14 and the process begins again as soon as the power center 10 switches back to partial load operation or from full load operation to partial load operation. Switching takes place by means of the changeover valve 20-1 from the way 20-1 / AB-B to the way 20-1 / AB and connection of the heat generator 24 ,

The control and regulation of the energy center takes place via a in 1 principle shown control and regulation system 22 ,

10

energy Source

12

Solar heat generator circuit

14

buffer memory [Buffer layers Memory]

16

Customer cycle [Heating circuit]

16-1

Heating control valve

16-1 / A-AB

heating

16-1 / A-B

heating partial load

16VL-1

withdrawal line from buffer memory

18

Customer cycle [Water circuit]

20

Heat generator cycle [conventional kettle]

20-1 / A-B

switching valve Heating operation via heat generator [Boiler]

20-1 / AB-B

switching valve Heating mode Partial load from buffer tank

20-2

overflow

20V1

supply line Heat generator cycle

20VL-1

first Infeed line [heat generator to buffer storage]

20VL-2

second Infeed line [heat generator to heating cycle]

22

Tax- and control system

24

heat generator

Ap

differential pressure

Claims (8)

Method for controlling a, in a heat generator cycle ( 20 ) arranged heat generator ( 24 ), whose supply line ( 20V1 ) with a buffer memory, in particular buffer layer memory ( 14 ) communicating with at least one customer cycle ( 16 . 18 ), wherein in the at least one consumer cycle ( 16 . 18 ) required amount of heat by loading the buffer memory ( 14 ), from which the at least one customer cycle ( 16 . 18 ) takes the required amount of heat, characterized in that - the flow line ( 20V1 ) for optimizing the operation of the heat generator ( 24 ) into a first and second feed line ( 20VL-1 . 20VL-2 ), in order - both a direct heat supply of the at least one consumer cycle ( 16 . 18 ) via a in the second feed line ( 20VL-2 ) arranged switching valve ( 20-1 ) - as well as a loading of the buffer memory ( 14 ) via the first feed-in line ( 20VL-1 ) in dependence of a customer cycle dependent valve position of a heating control valve ( 16-1 ), of the at least one customer cycle ( 16 . 18 ) via an intermediate line ( 20V1 ) and the first feed line ( 20VL-1 ) arranged overflow valve ( 20-2 ), which depends on a at this overflow valve ( 20-2 ) forming differential pressure (Δp) opens and closes to ensure, so that in a part load operation of the customer cycle ( 16 . 18 ) a heat transfer to the buffer memory ( 14 ), which allows an extension of the term and a timing of the heat generator ( 24 ) is avoided. A method according to claim 1, characterized in that loading of the buffer memory ( 14 ) via the first feed-in line ( 20VL-1 ) depending on the customer cycle dependent valve position of a heating control valve ( 16-1 ) of the at least one customer cycle ( 16 . 18 ) via the flow line ( 20VL ) and the first feed line ( 20VL-1 ) arranged overflow valve ( 20-2 ) until a predeterminable threshold value has been reached at a temperature sensor (ts6), after which a switchover of the changeover valve ( 20-1 ), a sampling line ( 16VL-1 ) to the at least one customer cycle ( 16 . 18 ) is opened, at the same time a shutdown of the heat generator ( 24 ) is effected. Energy Center ( 10 ) with a heat generator ( 24 ) and an associated heat generator cycle ( 20 ), whose supply line ( 20VL ) with a buffer memory, in particular buffer layer memory ( 14 ) communicating with at least one customer cycle ( 16 . 18 ), characterized in that - the flow line ( 20VL ) for optimizing the operation of the heat generator ( 24 ) into a first and second feed line ( 20VL-1 . 20VL-2 ), in order - both a direct heat supply of the at least one consumer cycle ( 16 . 18 ) via a in the second feed line ( 20VL-2 ) arranged switching valve ( 20-1 ) - as well as a loading of the buffer memory ( 14 ) in dependence of a customer cycle dependent valve position of a heating control valve ( 16-1 ), of the at least one customer cycle ( 16 . 18 ) via an intermediate line ( 20VL ) and the first feed line ( 20VL-1 ) arranged overflow valve ( 20-2 ) to ensure. Energy Center ( 10 ) according to claim 3, characterized in that the loading of the buffer memory ( 14 ) via the first feed-in line ( 20VL-1 ) in the upper defined volume range of the buffer memory ( 14 ) he follows. Energy Center ( 10 ) according to claim 3 or 4, characterized in that the loading of the Buffer memory ( 14 ) as a function of the customer cycle dependent valve position of the heating control valve ( 16-1 ) of the at least one customer cycle ( 16 . 18 ) via the between feed line ( 20V1 ) and the first feed line ( 20VL-1 ) arranged overflow valve ( 20-2 ) until it is possible to reach a predefinable threshold value at a temperature sensor (ts6), after which a switchover of the switching valve ( 20-1 ), a sampling line ( 16VL-1 ) to the at least one customer cycle ( 16 . 18 ) is opened, at the same time a shutdown of the heat generator ( 24 ) is feasible. Energy Center ( 10 ) according to claim 3 or 5, characterized in that the overflow valve ( 20-2 ) is a controlled with or without external power valve. Energy Center ( 10 ) according to claim 6, characterized in that the overflow valve ( 20-2 ) together with the other fittings of the energy center ( 10 ) as a foreign energy controlled valve in a control system ( 22 ) of the energy center ( 10 ) is involved. Energy Center ( 10 ) according to claim 1, characterized in that the buffer memory ( 14 ) in addition to the conventional heat generator cycle ( 20 ) by a solar heat generator cycle ( 12 ) is loadable.