KR20000055034A - A energy save feed forward and feed back boiling controlling method - Google Patents

Abstract

PURPOSE: A prompt combustion control method is provided to control combustion in hot water generation by sensing the temperature of heating circulated water by using two thermistors in a gas boiler. CONSTITUTION: An operation of a water stream switch is sensed. A three-way valve(36) is set up to a hot water generation. The operation of the three-way valve is confirmed by using a response signal. A microcomputer(MICOM) controlling a system receives the temperature(Tset) set up by a user, the temperature(Tout) of heating tapped water and the temperature(Tin) of heating circulated water. The microcomputer performs an emergent hot water generation if the temperature set up by a user is not read out. A forcible combustion is performed for a certain time(A) according to the opening degree of a proportional valve(53) input by predetermination while a total calory(Q) needed for hot water is calculated. Thereafter, the torques of an exhaust fan is calculated based on the total calory and the exhaust fan is operated. The torques of the exhaust fan is compared with a predetermined torques(Z) for a certain time(B) to decide the operation state of the exhaust fan. Herein, an error is detected. If the exhaust fan is operated normally, the proportional valve is controlled by the torques of the exhaust fan. Thereby, a proportional combustion is maintained.

Description

Combustion control method for hot water operation using temperature of hot water and heating return of gas boiler {A ENERGY SAVE FEED FORWARD AND FEED BACK BOILING CONTROLLING METHOD}

The present invention relates to a combustion control method for hot water operation using the temperature of hot water and heating return of a gas boiler. More specifically, Quickly determine the amount of heat (Q) required for hot water combustion using the temperature (T _out , T _in ) and the user-set temperature (T _set ), which is the target hot water temperature _set by the user. The present invention relates to a method of controlling the amount of combustion by adjusting the gas proportional valve by calculating a gas proportional valve control current value (mA) for sensing Φ and controlling the amount of combustion lamp.

In the conventional method of controlling combustion according to hot water operation, one temperature sensor (Thermistor) is mounted on one side of the heating tapping side or the heating return side, and the amount of gas required for combustion based on the temperature value measured from the temperature sensing sensor and The rotation speed of the exhaust fan was adjusted. The hot water operation (hot water operation) is a hot water operation is performed by exchanging heat in close proximity to the direct water coming from the outside when the heating water warmed in the primary flue exchanger passes through the secondary heat exchanger.

However, since this method measures and uses only the temperature of the heating circulation water on one side of the tapping or returning side, there is a problem that a difference occurs between the temperature of the circulating water being measured and the room temperature of the hot water used by the user. Even in the time difference of the combustion control for hot water operation, there was a problem in that the combustion control could not be performed quickly.

The present invention has been made to solve the problems of the prior art operating as described above, the main object of the heating circulation using the two thermistors (TH1, TH2) mounted on the heating return side and heating tapping side of the gas boiler It is to provide a fast combustion control method for hot water operation by detecting the number more accurately.

1 is a block diagram showing an entire system of a gas boiler applied to the present invention,

Figure 2a, 2b is a flow chart showing a hot water temperature combustion control method according to an embodiment of the present invention,

3 is a graph for calculating the rotational speed value of the exhaust fan using the amount of fuel required for hot water combustion of the present invention;

4 is a graph for obtaining a current value for controlling the gas proportional valve using the rotational speed value of the exhaust fan during hot water combustion of the present invention.

<Description of the code | symbol about the principal part of drawing>

13: fan 14: primary heat exchanger 30: secondary heat exchanger

33: water flow switch 36: three-way valve 53: gas proportional valve

TH1: Thermistor 1 TH2: Thermistor 2

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be more apparent from the following detailed description based on the accompanying drawings in order to achieve the above object.

1 shows a gas boiler 1 to which the present invention is applied, which is installed in a casing 2 of the gas boiler 1 to burn a gas to heat hot water for heating or hot water supply. And, the water tank 20 for replenishing the heating circulation water, and the secondary heat exchanger (30) for exchanging heat through different paths with the heating water already heated in order to heat the hot water coming from the outside into the hot water supply (30) ) Are constructed by combining each other.

At this time, a burner group 12 including a plurality of burners is formed in the casing 11 of the combustor 10, and a primary heat exchanger 14 is installed in the upper direction thereof to prevent overheating and the water passing therethrough. The burner group 12 is heated, and a fan 13 for supplying combustion air is installed at the bottom of the combustor casing 11, and the burner group 12 is provided near the burner group 12. A spark plug 15 for ignition and a flame rod 16 for detecting ignition of the burner group are installed, and an exhaust part 18 for discharging waste gas is provided on the upper surface of the combustor casing 11. Is formed through the case 2 of the gas boiler (1).

In addition, a gas pipe 50 for supplying gas is installed below the burner group 12, which includes two electromagnetic valves 51 and 52 for passing the gas at the time of energization and a proportional valve for adjusting the gas supply amount. 53 is provided from the upstream of the gas pipe 50 with respect to the gas supply path.

Meanwhile, the water tank 20 has a high water level sensor 21 for detecting the quantity of water in the water tank, an overflow pipe 22 for discharging excess water, and whether the water is empty or filled in the pipeline. Low water level detection sensor 32 to detect, the heating return pipe 24 is installed with a separator 23 for recovering the heating water rotated on the bottom floor and the water supply pipe 25 for supplying water to the primary heat exchanger (14) ) Is provided with a circulation pump 26 for adjusting the circulation of water in the downward direction.

In addition, thermistor 1 (TH1) for detecting the temperature of the heated hot-water flowing out of the primary heat exchanger (14) and the temperature of the heating return for entering the heat exchanger for the primary heat exchanger (14) are detected. Thermistor2 (TH2) is attached to measure the temperature of each hot water and heating return, and the flow switch (Folw Swith: FLS, 33) and direct water to detect the presence of water flow when cold water flows in from the outside of the gas boiler Water flows through the three-way valve 36 through the three-way valve 36 through the direct inflow pipe 34 and the water supply pipe 25 in which a mechanical automatic quantity control device is installed to obtain a stable temperature characteristic by passing a predetermined amount according to temperature. Is connected to the heating hot water supply pipe 37.

In addition, between the heating return pipe 24 and the direct water inlet pipe 34 is provided with a tap water supply valve 35 for replenishing water when the water tank 20 is insufficient, clogging of the heating filter, heating distributor By-pass pipe (38) is provided for making and circulating the internally closed circuit of the gas boiler (1) when the blockage and the heating distribution pipe are blocked, and the casing (2) of the gas boiler (1) is installed. It is equipped with a low temperature sensing thermistor (Thermistor3, TH3).

Combustion control method during hot water operation using the temperature of the hot water and heating return of the gas boiler according to a preferred embodiment of the present invention detects the operation of the water flow switch to set the three-way valve to the hot water side, using a response signal In the second step of confirming the operation of the three-way valve, the microcomputer (MICOM) for controlling the system is set by the user for the use of hot water (T _set ), heating tapping temperature (T _out ), heating return side temperature fourth step of reading (T _in) the third stage, the input user setting temperature (T _set) for receiving the performing emergency water operation If you do not have the user set temperature (T _set) reading, pre-set input The fifth step of calculating the total amount of heat (Q) required for hot water at the same time as the forced combustion for a predetermined time (Asec) according to the gas proportional valve opening and closing amount, the rotation speed of the exhaust fan from the calculated total amount of heat (Q) To calculate A sixth step of driving the exhaust fan; and a seventh step of detecting an error state by comparing the exhaust fan rotation speed with a predetermined rotation speed (ZHz) for a predetermined time (Bsec) to determine an operation state of the exhaust fan. When the operation of the exhaust fan is determined to be normal, the eighth step of calculating a current value for controlling the proportional valve according to the rotational speed of the exhaust fan, and proportional combustion by controlling the proportional valve using the proportional valve current value In the ninth step of maintaining, the difference between the heating tapping side temperature T _out and the heating return side temperature T _in (ΔT = | T _out -T _in |) is calculated according to the result of the proportional combustion. In a tenth step, the difference between the user set temperature (T _set ) and the tapping temperature (T _out ) while the temperature difference (ΔT) is between predetermined temperature values (C ° C., D ° C.) (ΔT ₁ = T _set − T _out) ) Is between different predetermined temperature values (E ℃, F ℃), and user set temperature (T _set ) and return temperature (T _in 11th step of extinguishing combustion if the condition (ΔT ₂ = T _set -T _in ) is within another predetermined temperature value (G ℃, H ℃) for a set time (Isec) and satisfies this condition. The temperature difference ΔT is between the predetermined temperature values (J ° C, K ° C), and the predetermined temperature value (L ° C, M ° C) is different from the difference ΔT ₁ between the user set temperature T _set and the tapping temperature T _out . ), And whether the difference (ΔT ₂ ) between the user set temperature (T _set ) and the return temperature (T _in ) is between another predetermined temperature value (N ° C., O ° C.) is determined during the set time (Psec). If the condition is satisfied, the twelfth step of starting combustion, the fifth step of counting the reburn and the forced combustion for the set time, and the thirteenth step of sequentially repeating the step, and the count are a predetermined number of times. And a fourteenth step of confirming that the water flow is switched off and controlling combustion.

In addition, the maximum amount of heat during maximum hot water combustion (Q _max ), the minimum amount of heat during hot combustion (Q _min ), the maximum amount of heat during burning (Q _dmax ), the minimum amount of heat during burning (Q _dmin ), and Calculation of the forced heat (Q _p ) during hot water combustion, the limit of the above calories is the maximum heat quantity (Q _max ) for maximum hot water combustion (Q _dmax )> the maximum heat quantity for maximum heating combustion (Q _dmax )> Q _p )〉 calorie value during minimum heating combustion (Q _dmin )〉 calorific value during minimum hot water burning (Q _min ), and the temperature difference (ΔT) is between the predetermined temperature values (C ℃, D ℃) The difference between the temperature T _set and the tapping temperature T _out (ΔT ₁ = T _set -T _out ) is between different predetermined temperature values (E ℃, F ℃), and the user set temperature (T _set ) and the return temperature Determining whether the difference of (T _in ) (ΔT ₂ = T _set -T _in ) is between the other predetermined temperature values (G ℃, H ℃) for a set time (Isec), 11 steps Standing, the predetermined temperature C is the teeth ℃ <is set to D ℃ <E ℃ <F ℃ <G ℃ <H ℃.

In addition, the temperature difference (ΔT) is a predetermined temperature value (J ℃, K ℃) value difference (ΔT ₁₎ is different predetermined temperature sits between the user set temperature (T _set) and the hot water temperature _{(T out) (L ℃,} M And the difference between the user set temperature (T _set ) and the return temperature (T _in ) (ΔT ₂ ) between the other predetermined temperature values (N ℃, O ℃) for a set time (Psec) In the twelfth step of starting combustion when this condition is satisfied, the predetermined temperature values are configured to be set to J ° C. <K ° C. <L ° C. <M ° C. <N ° C.

The invention can be variously modified and can take various forms and only the specific examples thereof are described in the following detailed description of the invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the following description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood that.

Referring to the operation of the present invention configured as described above are as follows.

Figure 2a, 2b shows a flow chart showing a hot water temperature combustion control method according to a preferred embodiment of the present invention. In a preferred embodiment of the present invention, when the user operates the gas boiler and turns on the hot water faucet to use hot water, the flow switch FLS is turned on to set the three-way valve to the hot water side. Then, the operation of the three-way valve is confirmed using an answer signal.

The MICOM controlling system is obtained by using thermistor 1 (TH1) in the outlet pipe where the user receives the heat from the primary heat exchanger 14 and the user set temperature (T _set ) set for the use of hot water. After receiving the discharged water side temperature (T _out ) and heat radiation in the ondol room, the heating return side temperature (T _in ) measured by using thermistor 2 (TH2) is input to the return pipe to increase the temperature of the heating circulation water. The user input temperature T _set is read and if the user set temperature T _set is not read due to an error of the system, emergency operation is performed.

When performing the initial heating combustion, disturbance occurs in the temperature of the heating tapping side and the heating return side, making it difficult to control the temperature. Therefore, forced combustion is performed for a predetermined time (Asec) according to the gas proportional valve opening and closing amount set in advance. At this time, the forced combustion time (Asec) is set shorter than the forced combustion time during the heating operation. This is because the closed pipe section is shorter in hot water operation than in heating operation.

And calculate the total amount of heat (Q) required for hot water. Total calorific value (Q, Kcal / min) is a proportional component (P, Kcal / min) is calculated as an integral component (I, Kacl / min), the proportional component is defined as Equation (1).

P = p × (T _set -T _out ), I = I _n-1 + {i × (T _set -T _out )}

Here, p is the bill account number, and is the amount of heat required to raise the heating circulation water in the conduit by 1 ° C, and is an integer read from a read only memory (ROM) of microcomputer, i is an integral constant, and I _n-1 is It means the value of I previously obtained.

The calorific value is calculated using a heating tapping temperature and a heating return temperature input from the thermistor 1 (TH1) and thermistor 2 (TH2) every 100 msec from the microcomputer. On the other hand, since the return temperature in the hot water operation is higher than the return temperature in the heating operation, the maximum heat quantity Q _{max in the} hot water operation is calculated to be higher than the maximum heat quantity Q _dmax in the heating operation. In addition, when the combustion is performed at a low temperature, since the drain phenomenon occurs, the minimum heat quantity Q _dmin during the heating operation is calculated to be higher than the minimum heat quantity Q _min during the hot water operation.

The rotation speed of the exhaust fan is obtained from the calculated total heat quantity Q. Figure 3 shows a graph for obtaining the rotational speed of the exhaust fan by using the amount of heat required during combustion of the hot water operation of the present invention.

Referring to FIG. 3, the exhaust fan rotation speed of the Y-axis may be obtained based on the heat amount displayed on the X-axis. That is, the exhaust fan rotational speed Φ is obtained according to the inclination of the graph, and the obtained range is also different in hot water operation and heating operation. For example, if the description, if the user and the Selecting a low setting temperature of the hot water (T _set) heat is to calculate the hot water minimum amount of heat (Q _min) in accordance with the input user set temperature (T _set), thereby the exhaust according The minimum value Φ _min of the fan is obtained, and the exhaust fan is driven.

In order to determine the operation state of the exhaust fan, the exhaust fan rotational speed is compared with a predetermined rotational speed (ZHz) for a predetermined time (Bsec) to detect an error state of the fan operation. When it is determined that the fan operation is normal, a control value for controlling the proportional valve is calculated according to the rotation speed of the exhaust fan.

5 is a graph for obtaining a current value for controlling the gas proportional valve using the rotational speed of the exhaust fan during the hot water operation combustion of the present invention.

In this graph, the current value for gas proportional valve control on Y axis is calculated based on the rotation speed of fan on X axis. Arithmetic equations for this are also shown in Equation 2.

P = A × Φ + P _min

Here, A is the slope of the graph, P _min is defined as the current minimum value (mA) for controlling the gas proportional valve during the combustion operation.

The proportional combustion is maintained by controlling the proportional valve using the proportional valve current value. And I by detecting the release bath temperature (T _out) the user set temperature (T _set) predetermined value temperature (U ℃) a predetermined time (qsec) maintained the same state is greater than or by subtracting the temperature difference (ΔT) balanced detection To judge the beginning of the The temperature difference equilibrium control is performed by calculating the temperature difference (| heating hot water temperature-heating return temperature |).

The predetermined temperature value in which the difference between the user set temperature T _set and the tapping temperature T _out (ΔT ₁ = T _set -T _out ) while the temperature difference ΔT is between predetermined temperature values C ° C. and D ° C. (E ° C, F ° C), and the difference between the user set temperature (T _set ) and the return temperature (T _in ) (ΔT ₂ = T _set -T _in ) is another predetermined temperature value (G °, H °). It judges whether it is in between for a set time (Isec), and if this condition is satisfied, combustion is extinguished.

The temperature difference ΔT is between the predetermined temperature values (J ° C, K ° C), and the predetermined temperature value (L ° C, M ° C) is different from the difference ΔT ₁ between the user set temperature T _set and the tapping temperature T _out . ), And whether the difference between the user set temperature (T _set ) and the return temperature (T _in ) (ΔT ₂ ) is between the other predetermined temperature values (N ° C, O ° C) for the set time (Psec) If is satisfied, reburn is performed.

After that, the process of counting the number of reburns and performing forced combustion for the set time (Qsec) is repeated. In a preferred embodiment of the present invention, the maximum number of counts is 15, and when the maximum number of counts is performed, the water flow switch is turned off and the combustion control ends.

According to the present invention as described above by using the two thermistors (TH1, TH2) on the heating return side and the heating tapping side of the gas boiler by detecting the heating circulation water by providing a combustion control method for hot water operation hot and cold tap water It is evident that this is a very advantageous invention that provides a way to control the temperature of the.

Claims (4)

In the combustion control method for hot water tapping of a gas boiler, A first step of sensing the operation of the water flow switch and setting the three-way valve to the hot water side; A second step of confirming the operation of the three-way valve using a response signal; A third step in which the MICOM controlling the system receives a user set temperature T _set , a heating tapping side temperature T _out , and a heating return side temperature T _in that the user targets to use hot water; Read the user input a set temperature (T _set) a fourth step of, if not the user set temperature (T _set) Read perform emergency water operation; A fifth step of performing forced combustion for a predetermined time (A) according to a preset gas input / output valve opening and closing amount and calculating a total heat amount (Q) required for hot water; A sixth step of driving the exhaust fan by calculating the rotation speed of the exhaust fan from the calculated total heat quantity Q; A seventh step of detecting an error state by comparing the exhaust fan rotational speed with a predetermined rotational speed Z for a predetermined time B to determine an operating state of the exhaust fan; An eighth step of calculating a current value for controlling the proportional valve according to the rotation speed of the exhaust fan when it is determined that the operation of the exhaust fan is normal; A ninth step of maintaining proportional combustion by controlling the proportional valve using the proportional valve current value; A tenth step of performing a temperature difference balance control by calculating a difference (ΔT = | T _out -T _in |) between the heating tapping side temperature T _out and the heating return side temperature T _in according to the proportional combustion result; The temperature difference (ΔT) is a predetermined temperature value (C, D) sits between the user set temperature (T _set) and the hot water temperature (T _out) of the difference _{(ΔT 1 = T set - T} out) the different predetermined temperature value (E , F), and whether the difference between the user set temperature (T _set ) and the return temperature (T _in ) (ΔT ₂ = T _set -T _in ) is between another predetermined temperature value (G, H) If it is determined during the period of Isec) and the condition is satisfied, the eleventh step of extinguishing combustion, the temperature difference (ΔT) is between the predetermined temperature value (J, K) of the user set temperature (T _set ) and the tapping temperature (T _out ) difference (ΔT ₁₎ is different predetermined temperature value (L, M) and between the user set temperature (T _set) and the return temperature (T _in) difference (ΔT _2), another predetermined temperature value (N, O) A twelfth step of judging whether it is in between for a predetermined time (Psec) and starting combustion when this condition is satisfied; A thirteenth step of sequentially repeating the fifth step of counting the reburn and performing a forced burn for the set time; And When the count reaches a predetermined number of times, the 14th step of confirming that the water flow is switched off and controlling the combustion is performed sequentially, wherein the hot water operation using the temperature of the hot water and the hot water of the gas boiler is performed. Way. The method according to claim 1, In the fifth step of calculating the total amount of heat (Q) required for the hot water, the maximum amount of heat (Q _max ), the maximum amount of heat (Q _min ) during the maximum hot water combustion of the hot water operation, the amount of heat during the maximum heating combustion ( Q _dmax), calculating a force combustion heat (Q _p) when heat quantity (Q _dmin), and hot combustion at the time of minimum heating combustion and limits of the above-mentioned amount of heat is the maximum amount of heat (Q _max) at the maximum hot combustion> maximum Heating Heat quantity at combustion (Q _dmax )> Forced heating quantity at hot combustion (Q _p )> Heat quantity at minimum heating combustion (Q _dmin )> Gas boiler at minimum hot water combustion (Q _min ) Control method of combustion in hot water operation using temperature of hot water and heating return of The method according to claim 1, The temperature difference (ΔT) is a predetermined temperature value (C, D) sits between the user set temperature (T _set) and the hot water temperature (T _out) of the difference _{(ΔT 1 = T set - T} out) the different predetermined temperature value (E , F), and whether the difference between the user set temperature (T _set ) and the return temperature (T _in ) (ΔT ₂ = T _set -T _in ) is between another predetermined temperature value (G, H) In the eleventh step of extinguishing combustion if the condition is satisfied during I), the predetermined temperature values are set to C 〈D 〈E 〈F 〈G 〈H Combustion control method in hot water operation using temperature of return water. The method according to claim 1, And between the temperature difference (ΔT) is a predetermined temperature value (J, K) sits between the user set temperature (T _set) and the hot water temperature (T _out) of the difference (ΔT ₁₎ is different predetermined temperature value (L, M) If the difference between the user set temperature (T _set ) and the return temperature (T _in ) (ΔT ₂ ) is between another predetermined temperature value (N, O) during the set time (P), the combustion is In the twelfth step of the start, the predetermined temperature values are set to J <K <L <M <N <O, the combustion control method during the hot water operation using the temperature of the hot water and heating return of the gas boiler.