KR20120061253A - Flow control method for preventing brain for circular pump in boiler - Google Patents

Abstract

PURPOSE: A control method for a circulation pump of a boiler for preventing a drain is provided to extend a service life of a heat exchanger by minimizing generation of a drain in the heat exchanger through controlling the flow conveying capacity. CONSTITUTION: A control method for a circulation pump of a boiler for preventing a drain is as follows. If present supply temperature of a heat exchanger is less than set supply temperature, whether the present supply temperature is over drain limit temperature or not is determined(S8). If the present supply temperature is more than the drain limit temperature, a step is immediately returned to a step of calculating the required amount of heat. If the present supply temperature is less than the drain limit temperature, a combustion order and the required amount of the heat are calculated after water conveyance output is reduced to a first step as much as the determined amount.

Description

Flow control method for preventing brain for circular pump in boiler

The present invention relates to a method for controlling the circulation pump flow rate of a boiler for preventing drain, and more specifically, in a boiler to efficiently use heat generated by burning a gas or other fuel, using a high temperature combustion gas heat. If the temperature of the circulating water is supplied at a temperature below the dew point of the moisture contained in the combustion gas while the phosphorus water is heated, the temperature of the circulating water is rapidly reached by limiting the amount of circulating water so that the circulating water is heated rapidly. It is invented so that drain generation can be suppressed as much as possible.

Generally, a boiler is used to heat water by using combustion heat and heat generated by burning it using fuel, coal or gas as fuel, or supplying electricity to a heater, and supplying hot water to various heating facilities In the case of a domestic boiler, hot water is supplied to the piping installed on the floor of the room or the like, and is used for supplying hot water through a water pipe or the like.

In this way, the circulating water is heated using heat generated by burning various fuels, and the circulating water is moved to a place where heat is to be used and radiated by using a circulating pump, and then moved to a high temperature part to obtain heat again. Done,

In such a mechanism, for example, when the temperature of the circulating water is below the dew point temperature of the combustion gas, the generation of the drain has been suppressed by restricting the minimum supply temperature of the circulating water and supplying a large amount of heat.

However, this control method does not provide a means to suppress the generation of drain as well as the waste of fuel as well as the waste of fuel as well as a large amount of heat and time required to supply the circulating water constantly and heat up to the limit temperature. There is a problem that drain occurs.

Accordingly, Korean Patent Publication 95-2920 (March 28, 1995) proposed a method of suppressing the drain phenomenon by forcibly increasing the set minimum heat limit.

In this method, however, even if the set minimum calorific value lower limit is forcibly increased, there is still a problem in that a drain phenomenon occurs when the equilibrium is maintained by the temperature increased by the increase in the return temperature.

Therefore, in recent years, Korean Patent Publication No. 10-0302273 proposes a method for suppressing the drain phenomenon in a gas boiler as a solution for solving the above problems, which includes a first step of starting a heating operation in a gas boiler; A second step of performing the normal operation by using the heating operation temperature on the heating return side and the temperature on the heating tapping side; A third step of determining a drain phenomenon during the normal combustion operation; A fourth step of performing normal combustion operation if it is not determined as a drain phenomenon and extinguishing the primary heat exchanger 14 if it is determined as a drain phenomenon; After the digestion is performed, the fifth step of repeatedly performing the third step from the third step of judging the drain phenomenon is performed sequentially.

However, this method simply detects the temperature of the tapping water on the heating tapping side and the pipe temperature on the heating returning side when the gas boiler is set at a low temperature, recognizes that the temperature values are consistent and maintains equilibrium, and extinguishes the gas boiler to break the equilibrium. It has a form to make the drain phenomenon can not be completely prevented as in the above example.

In particular, in most boilers, as shown in FIG. 1, when there is a heat supply request according to heating or hot water operation, the circulation pump is operated to the maximum, the burner is instructed to burn, and the required heat quantity is calculated to calculate the current supply temperature of the heat exchanger. The amount of fuel is controlled until the supply temperature is higher than the supply temperature. When the current supply temperature of the heat exchanger is higher than the set supply temperature, the combustion is stopped, the circulation pump is also stopped, and the operation is entered into the standby mode.

That is, conventionally, when there is a heat supply demand, the circulation pump is driven to the maximum regardless of the tapping temperature of the heating water passing through the heat exchanger or the return temperature of the heating water.

However, depending on the heating load, the temperature of the heating water returned to the heat exchanger may be 5 ° C. or lower. In this case, the circulation pump is operating at maximum, so the heating water tapping temperature of the heat exchanger is sometimes the drain generation temperature. For example, there is a problem that the drain is generated in the heat exchanger to fall below 45 ℃.

The present invention has been devised to solve such a conventional problem, and if there is an initial heat supply demand, while driving the circulating pump to the maximum, while supplying fuel to the burner in response to the required heat amount after ignition during the progress of combustion If the current supply temperature of the detected heat exchanger is less than the set supply temperature, the step of comparing the current supply temperature with the drain limit temperature is further performed. If the current supply temperature is not greater than or equal to the drain limit temperature, the flow rate output of the circulation pump is output. Is reduced by one step, and then the step of returning to the step of calculating the required heat quantity and circulation pump flow rate output is repeated to minimize the occurrence of drain in the heat exchanger, thereby greatly extending the endurance life of the heat exchanger itself. Unnecessary fuel consumption since the initial heating time can be minimized Not only it can be significantly reduced as there is provided a method of controlling the circulation pump flow rate Boiler for reliability and prevent a drain that can dramatically improve the consumer's experience of the product.

The present invention for solving the above problems, the power supply for supplying a power supply voltage for the operation of the boiler; A remote controller for allowing a user to remotely generate a key signal for driving the boiler; A supply temperature detector for detecting a supply temperature of heating water supplied from a heat exchanger; A data storage unit for storing various data necessary for heating and hot water control; A control unit performing an overall control function of the boiler; In response to the output signal of the control unit is provided with a three-way and a functional parts driving unit for driving the functional parts, such as a circulating pump, igniter, gas valve and blower fan, and if there is a heat supply request for the initial heating or hot water operation, the circulating pump Operate at maximum and instruct burner and calculate required heat and control fuel supply until the current supply temperature of heat exchanger is higher than the set supply temperature, but the current supply temperature of heat exchanger is higher than the set supply temperature. In this case, the combustion is stopped, the circulating pump is stopped, and the operation control method of the boiler entering the operation standby mode is performed. As a result of comparing the present supply temperature and the set supply temperature of the heat exchanger, the present supply temperature is less than the set supply temperature. Determining whether the current supply temperature is equal to or greater than the drain limit temperature. If the current supply temperature is above the drain limit temperature, the flow returns to the step of calculating the combustion instruction and the required heat, and if the current supply temperature is below the drain limit temperature, the flow feed output of the circulation pump is decreased by one step and then the combustion instruction is given. And returning to calculating the required calorific value.

In addition, the step of calculating the combustion instruction and the required heat amount is characterized in that for further calculating the flow rate output of the circulation pump.

At this time, the value of lowering the flow rate output of the circulation pump by one step is set to 10-15% compared to the previous flow rate output.

As described above, according to the circulating pump flow rate control method of the boiler for preventing draining, when the initial heat supply is required, the circulating pump is driven to the maximum, and fuel is supplied to the burner in response to the required heat calculated after ignition. If the current supply temperature of the heat exchanger detected during the combustion is less than the set supply temperature, the step of comparing the current supply temperature and the drain limit temperature to each other is further performed.If the current supply temperature is less than the drain limit temperature, the circulation pump The flow rate output of the pump is reduced by one step, and then it is repeated to return to the step of calculating the required heat quantity and the circulation pump flow rate output to minimize the generation of drain in the heat exchanger by adjusting the flow rate capacity of the circulation pump. Can greatly extend the endurance life of the heat exchanger itself In addition, the initial heating time can be minimized, which significantly reduces unnecessary fuel consumption, and greatly improves the reliability of the product and the customer's satisfaction itself.

1 is a flowchart for explaining an operation control method in a conventional boiler.
Figure 2 is a block diagram of a boiler control circuit to which the present invention method is applied.
3 is a flowchart for explaining the method of the present invention.
Figure 4 is a table of the minimum circulating flow rate for suppressing the drain generation of the maximum circulating flow rate of the circulation pump for each boiler capacity.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows a block diagram of a boiler control circuit to which the method of the present invention is applied, Figure 3 shows a flowchart for explaining the method of the present invention,

Figure 4 shows the minimum circulating flow rate comparison table for suppressing the drain generation of the maximum circulating flow rate of the circulation pump for each boiler capacity.

According to the present invention,

A power supply unit 1 for supplying a power voltage necessary for the operation of the boiler; A remote controller 2 for allowing a user to remotely generate key signals necessary for driving the boiler; A supply temperature detector (3) for detecting a supply temperature of the heating water supplied from the heat exchanger; A data storage section 4 for storing various data necessary for heating and hot water control; A control unit 5 for performing an overall control function of the boiler; In response to the output signal of the controller, a functional part driving unit 6 for driving functional parts such as the three-way side 62, the circulation pump 64, the igniter 66, the gas valve 68, and the blower fan 70 is provided. If there is a heat supply requirement according to the initial heating or hot water operation (S1), the circulation pump 64 is operated at maximum (S2), the burner is instructed to burn, and the required heat is calculated (S3). The current supply temperature is continuously compared with the set supply temperature (S4), and the fuel supply is controlled until the current supply temperature is equal to or higher than the set supply temperature, but the combustion is stopped when the current supply temperature of the heat exchanger becomes higher than the set supply temperature. In the operation control method of the boiler (S5) and the circulation pump 64 also stops (S6) and enters the operation standby mode (S7),

Comparing the current supply temperature and the set supply temperature of the heat exchanger in the step S4 and determining whether the current supply temperature is greater than or equal to the drain limit temperature when the current supply temperature is less than the set supply temperature (S8);

If the current supply temperature is equal to or greater than the drain limit temperature, the flow returns to the step S3 of immediately calculating the combustion instruction and the required heat amount. If the current supply temperature is less than the drain limit temperature, the flow rate power output of the circulation pump 64 is increased by a predetermined amount. It is characterized in that the step (S9) to return to the step (S3) for calculating the combustion instruction and the required heat amount after the step is lowered.

In addition, the step of calculating the combustion instruction and the required heat amount (S3) is characterized in that further calculating the flow rate output of the circulation pump (64).

At this time, the value of lowering the flow rate output of the circulation pump 64 by one step is set to 10-15% compared to the previous flow rate output.

Meanwhile, although not shown, the boiler is further provided with an indoor temperature detector, a hot water temperature detector, and a return water detector.

Reference numeral 61 is a three-way drive, 63 is a circulating pump drive, 65 is an igniter drive, 67 is a gas valve drive, 69 is a blower fan drive.

Referring to the operation and effect according to the present invention consisting of these steps are as follows.

First, the method of the present invention includes a power supply unit 1, a remote control unit 2, a supply temperature detector unit 3, a data storage unit 4, a control unit 5 and a three-way side 62, a circulation pump 64, and an igniter ( 66), the boiler having a functional part drive unit (6) for driving the gas valve 68 and the blower fan (70), if the initial heat supply needs to drive the circulating pump (64) to the maximum, calculated after ignition The fuel is supplied to the burner in response to the required heat amount, and if the present supply temperature of the heat exchanger detected during the combustion is less than the set supply temperature is further compared, the present supply temperature and the drain limit temperature are further compared (S8). When the current supply temperature is less than the drain limit temperature, the flow rate output of the circulation pump 64 is decreased by one step by a predetermined amount, and then the flow returns to the step S3 of calculating the required heat quantity and the circulation pump flow rate output. In a heat exchanger And one that allows you to minimize the rain caused the major technology components.

At this time, in the step S3 of calculating the combustion instruction and the required heat amount, in addition to calculating the combustion instruction and the required heat amount, the flow rate output of the circulation pump 64 may be further calculated.

Referring to the overall process of the present invention including the main technical gist of the present invention as follows.

As a result of performing a predetermined control program by receiving the output signal of the remote controller 2 and the output of various data detecting means from the control unit 5, if there is a heat supply request for initial heating or hot water operation (S1), the circulating pump first Operation 64 is performed at maximum (100%) (S2), and then the burner is instructed to burn, and at the same time, the required heat quantity and flow rate calculation (S3) of the circulation pump 64 are performed.

Then, the control unit 5 is the current supply temperature (actually the current supply temperature ± α ℃) of the heat exchanger detected through the supply temperature detection unit 3 is connected to the temperature sensor for tapping temperature detection installed at the outlet of the heat exchanger ) And the user's set supply temperature are mutually compared (S4), when the current supply temperature of the heat exchanger is higher than the set supply temperature, the combustion is stopped (S5), the circulation pump 64 is also stopped (S6), and then the operation standby mode It enters (S7).

However, as a result of comparing the present supply temperature and the set supply temperature of the heat exchanger in the step (S4), if the present supply temperature is less than the set supply temperature, the present supply temperature is the current supply compared to the drain limit temperature (for example, return temperature 5 ℃) It is judged whether the temperature is 45 ± α ° C.) or more (S8).

As a result, if the current supply temperature is above the drain limit temperature, the flow returns to the step S3 of calculating the combustion instruction and the required heat quantity and the flow rate output of the circulation pump 64, but if the current supply temperature is below the drain limit temperature, the circulation pump The flow rate output of step 64 is decreased by one step by a predetermined amount (S9), and then the flow returns to the step S3 of calculating the combustion instruction, the required heat quantity, and the flow rate output of the circulation pump 64.

At this time, the value of lowering the flow rate output of the circulation pump 64 by one step was set to a value of 10-15% lower than the previous flow rate output, that is, the previous rotational speed.

Of course, after calculating the combustion command and the required heat quantity and the flow rate output of the circulation pump 64 again (S3), the present supply temperature is set to the set supply temperature as a result of comparing the present supply temperature and the set supply temperature of the heat exchanger again. If the current supply temperature is less than the drain limit temperature again, if it is less than one again (S8), and as a result, if the current supply temperature is also less than the drain limit temperature, the flow rate output of the circulation pump 64 is lowered by one step again by a predetermined amount. The step S3 of calculating the next combustion instruction and the required heat quantity and the flow rate output of the circulation pump 64 is repeatedly performed until the current supply temperature is equal to or higher than the set supply temperature.

As such, if the current supply temperature, which is the tapping temperature of the heating water discharged from the heat exchanger, is lower than the drain limit temperature, if the flow rate output of the circulation pump 64 is lowered by one step by a predetermined amount, the tapping temperature of the heat exchanger is maximized. Since the drain generation temperature is exceeded within a short time, drain generation can be suppressed as much as possible.

On the other hand, the flow rate in the heating pipe when heating through the boiler usually has a flow rate of about 80 ~ 200 liters, the maximum output of the boiler at the maximum output of the circulation pump 64 and the capacity for the circulating pumps installed in the boiler Depending on the flow, the instantaneous flow rate is circulated at a speed of 15 to 20 liters / minute as shown in FIG.

However, the time it takes to circulate all the heating water in the heating pipe simply by operating the circulation pump 64 having such a characteristic at the maximum output power needs at least about 5 to 10 minutes.

In addition, depending on the degree of cooling in the room, the temperature of the heating water, which is returned for up to 2 hours, is circulated to the boiler in a low state. The case occurs.

This phenomenon is explained by the following equation.

Q = Cp M ΔT

Where Q is calorie (Kcal / min)

        Cp: Specific heat of circulating medium (kcal / kg. ℃) 1 kcal / kg. ℃ for water

        M: mass flow rate (kg / min)

        ΔT: Water inlet temperature difference (℃)

 Therefore, in the above formula, since the maximum supply heat is limited to the maximum capacity of the boiler, maximizing the temperature difference between the inlet and outlet is to suppress the generation of the drain as much as possible, and for this purpose, reducing the mass flow rate may be one method.

Therefore, in the present invention, as described above, if the initial heat supply is required, the circulating pump 64 is driven to the maximum, and the fuel is supplied to the burner in response to the required heat amount calculated after ignition and the flow rate output output value of the circulating pump 64. If the present supply temperature of the heat exchanger detected during the combustion progress is lower than the set supply temperature, the step of comparing the present supply temperature with the drain limit temperature is further performed. Lowering the flow pump output of the circulating pump by one step and then returning to the step of calculating the required calorific value and the circulating pump flow pump output again and again, generating drain in the heat exchanger by adjusting the flow pump capacity of the circulating pump. Can minimize the durability of the heat exchanger itself. You can minimize the time but were able to significantly reduce unnecessary fuel consumption, but was able to significantly improve the reliability and consumer satisfaction of the product itself.

FIG. 4 is a table illustrating the minimum circulation flow rate of the circulation pump for suppressing drain generation when the return temperature is 5 ° C. and the drain generation temperature is 45 ° C. compared to the maximum circulation flow rate of the circulation pump according to the capacity of each boiler. It is illustrated.

On the other hand, the description so far occurs when the tapping temperature of the heating water discharged from the heat exchanger when the return temperature of the heating water returned to the heat exchanger is lower than 5 ° C, for example, the drain generation temperature is 45 ° C or more. The method of lowering the flow rate output (that is, the number of revolutions) of the circulation pump in order to prevent the drainage phenomenon is described. In addition, the heating water return sensor is installed to detect the return or supply of heating water. For example, when the return temperature of the heating water is lower than 5 ° C, the opening / closing amount of the valve for controlling the heating water supply amount is controlled accordingly (that is, by reducing the heating water supply level in multiple stages in case there is a risk of drainage). Drain generation can also be prevented.

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

1: power supply 2: remote control
3: supply temperature detector 4: data storage
5: control unit 6: functional part driving unit
62: three-way side 64: circulation pump
66: igniter 68: gas valve
70: blowing fan

Claims (3)

If there is a heat supply requirement for the initial heating or hot water operation, the circulation pump is operated at maximum, the burner is instructed to combust, and the required heat is calculated to calculate the required heat until the current supply temperature of the heat exchanger becomes higher than the set supply temperature. In the method of controlling the operation of the boiler to stop the combustion, stop the circulating pump and then enter the operation standby mode when the current supply temperature of the heat exchanger exceeds the set supply temperature,
Comparing the current supply temperature and the set supply temperature of the heat exchanger to determine whether the current supply temperature is greater than or equal to the drain limit temperature if the current supply temperature is less than the set supply temperature;
If the current supply temperature is above the drain limit temperature, the flow returns to the step of calculating the combustion instruction and the required heat, and if the current supply temperature is below the drain limit temperature, the flow feed output of the circulation pump is decreased by one step and then the combustion instruction is given. And returning to the step of calculating the required heat amount; circulating pump flow control method of the boiler for preventing the drain.
The method according to claim 1,
In the step of calculating the combustion instructions and the required heat amount, the circulation pump flow control method of the boiler for preventing the drain, characterized in that further calculating the flow rate output of the circulation pump.
The method according to claim 1,
The value of lowering the flow rate output of the circulating pump by one step is set to 10-15% compared to the previous flow rate output, boiler circulating pump flow control method for preventing the drain.

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