JP2002005433A - Heating medium heater system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heating medium heater system in which the facility cost and running cost can be lowered, downsizing can be attained and maintenance is facilitated. SOLUTION: The heating medium heater system for heating a user/heating object indirectly by heating a heating medium, e.g. oil, circulating between the user and a heating medium heater by means of the heating medium heater comprises at least one heat storage burner system 5 comprising a single coil-like heating tube 2 arranged along the inner wall face of the heating medium heater, and a heat storage body 12 and arranged to supply combustion air and to discharge exhaust combustion gas through the heat storage body 12 and to supply the combustion air while preheating at the self-firing temperature of mixed gas or above by switching the flow of combustion gas and combustion air relatively to the heat storage body 12 thereby passing the combustion air through the heat storage body 12 heated by the combustion gas. Heating medium flowing through the coil 2 is heated only at a radiation heat transfer section 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating medium, such as oil, which circulates between a user (equipment for performing heating, heating, etc. using a heating medium) and a heating medium heater. The present invention relates to a heating medium heater system that indirectly heats an object to be heated by a user by heating and heating the object. More specifically, the present invention relates to an improvement in a heat medium heater portion.

[0002]

2. Description of the Related Art As shown in FIG. 3, for example, a heating medium heater 101 of a conventional heating medium heater system includes a coil-shaped heating tube (hereinafter, simply referred to as a coil) 102 wound so as to be closely contacted with no gap. It is arranged threefold along the inner wall of the furnace body, the space 103 inside the innermost coil 102a is configured as a combustion chamber, and each coil 102a, 102
Combustion gas is discharged outside the furnace through a space 104 between b and 102c. That is, the combustion chamber 103 of the heat medium heater mainly functions as a radiant heat transfer unit that heats the heat medium by radiant heat, and the coils 102a, 102b, and 10
The space / flow path 104 between 2c functions as a convection heat transfer unit that heats the heat medium by convection heat transfer. Then, the inner coil 102a is radiantly heated by burning the burner 105 in the combustion chamber 103 inside the inner coil 102a disposed on the innermost side, and between the inner coil 102a and the middle coil 102b and between the inner coil 102b and the outer coil. Convection heating is performed when the combustion gas is passed through each flow path 104 between the first and second flow paths 102c.

[0003] Triple coils 102a, 102b, 102
c is provided so that each inlet end and outlet end are connected to the headers 106i and 106o disposed outside the furnace, and then form a closed loop between the user 120 and the connected tube 121. I have. The heat medium is merged at the outlet header 106o outside the furnace, is made into one stream, and is supplied to the user, for example, the reactor 120. Here, since the heating medium passing through each of the coils 102a, 102b, 102c has different heating conditions and coil lengths, the temperature when exiting from the heating medium heater 101 is different. The mixing is performed to make the temperature uniform. The heat medium used for the predetermined heating operation is returned to the heat medium heater 101 again. Then, it is split again by the header 106i, distributed to the triple coils 102a, 102b, 102c in the furnace, and heated again to a desired temperature while passing through the coils 102a, 102b, 102c. In this way, the heat medium circulates between the heat medium heater 101 and the user 120 to indirectly heat the object to be heated. Further, an exhaust heat recovery device 123 for preheating combustion air may be provided to increase thermal efficiency. In addition, the symbol 122 of the figure is a circulation pump,
124 is a chimney.

Here, as shown in FIG. 3, for example, a heating medium heater 101 is provided at a furnace top (or a hearth 11 in some cases).
3) A diffusion burner 105 is provided at the center of 111, and a chimney port 107 connected to a chimney 124 is provided at the periphery, and a heat medium is heated while passing between the coils 102a, 102b, and 102c by heating 350. ~ 450 ° C
It is provided so that the combustion gas reduced to the extent is discharged out of the furnace. The combustion chamber 103 and the space 104 between the coils are partially (four to six in the circumferential direction) supported by a heating tube support 108 which projects the lower ends of the inner coil 102a and the middle coil 102b from the hearth 113 so that the hearth 113 And is communicated through a communication port 109 formed by floating from above.

[0005] A seal structure is provided around the burner 105 at the furnace top 111 to shield the space between the inner coil 102a and the combustion chamber 103 inside thereof to prevent a short path of combustion gas to the flue 107. This sealing structure is
1 is a cylindrical sealing plate 110 made of a refractory material that hangs down into the furnace.
Around which a filler such as ceramic wool 11
2 and so on to hold the inner coil 102a. As a result, 1000
Combustion gas is introduced from between the vicinity of the hearth 113 and between the coils 102a, 102b, and 102c to prevent the formation of a short path in which the combustion gas of ~ 1200 ° C flows to the flue port 107 and rises in the convection heat transfer section to increase the smoke. It is provided so as to form a path for the combustion gas flowing to the entrance 107.

[0006] A manhole 114 is provided at the center of the hearth 113 for allowing a worker to enter the furnace for periodic inspection and cleaning. This manhole 1
14 is normally closed by a manhole cover 115. Note that reference numeral 116 denotes a gantry.

[0007]

However, the coils 102a, 102b, 102 have a triple coil structure.
Since the convection heat transfer portion is formed between the coils c, when the winding of the coil is disturbed (displaced in the radial direction) as shown in FIG. Since a certain portion or a widening portion occurs, the flow of the combustion exhaust gas is deviated and uneven, so that uneven heating occurs. In order to prevent this, after the heating tube is wound into a coil, it must be corrected using a correction jig so as to eliminate the deviation (the state shown in FIG. 4B), but this correction processing is troublesome. In addition to this, there is a problem that the cost is very high. Also, even if the displacement in one coil is eliminated, if the displacement between the coils occurs when the coils are arranged as a triple coil as shown in FIG. Is generated, and the same problem occurs. Therefore, a centering operation for eliminating the deviation is required, and this is not a simple operation. Further, it is necessary to manufacture three types of coils having different winding diameters. Therefore, it has become an expensive facility.

In addition, the heat received by the heat medium differs greatly between the inner coil heated by radiant heat transfer and the inner and outer coils heated by convective heat transfer, and the path length of the heat medium differs for each coil. Therefore, the temperature of the heat medium at the outlet of each coil greatly differs. For this reason, the heating medium is adjusted to a desired temperature by mixing with a header, and then supplied to the user side. However, the heating medium passing through the inner coil is necessarily heated excessively. Therefore, there is a problem that coking is easily caused and the life is shortened.

Further, the seal structure is complicated and easily damaged. When the seal is damaged or a seal failure occurs, there is a possibility that the heating medium heater casing is damaged by a short path of the high-temperature combustion gas.

Further, each coil is obtained by joining a plurality of pipes by welding or the like so as to obtain a required length. Therefore, in the triple coil structure, there is a problem that the inner and outer coils are hidden, and it is not possible to check for poor welding at this portion. In addition, even if the inner and outer coils become dirty, it is difficult to clean them.

Also, the inner coil 102a and the middle coil 1
The heating support 108 that supports the 02b by floating it from the hearth 113 is easily exposed to high-temperature oxidation because it is exposed to the radiation from the high-temperature combustion chamber 103 and the passing combustion gas.

Further, since there is a possibility that the core position of the coil may be shifted due to vibration during transportation or the like, it is necessary to cure the coil so as to maintain the interval between the coils. Further, coil pitch deviation (due to deviation in the radial direction) may occur due to its own weight or vibration, and irregularities may occur. Therefore, the time and cost for welding a spacer such as a steel rod to the side surface of the coil is required.

Further, since a local high-temperature region is generated near the burner due to the flame, the furnace temperature must be set in accordance with the local high-temperature region. ). For this reason, the amount of radiant heat transfer is reduced, and the heat transfer area including the convection heat transfer portion must be increased, resulting in a problem that the furnace body becomes large.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating medium heater system capable of reducing equipment costs and running costs. It is a second object of the present invention to provide a heating medium heater system that enables downsizing. It is a third object of the present invention to provide a heating medium heater system that facilitates maintenance.

[0015]

In order to achieve the above object, the invention according to claim 1 is characterized in that the object to be heated is heated via a heat medium such as oil circulating between a user and a heat medium heater connected by a tube. A heat medium heater system for indirectly heating an object includes a furnace body, a single coil-shaped heating tube arranged along an inner wall surface of the furnace body, and a heat storage body, and a heat storage body through the heat storage body. While the air is supplied and the combustion gas is discharged, the flow of the combustion gas and the combustion air to the regenerator is relatively switched, and the combustion air passes through the regenerator heated by the heat of the combustion gas, and the self-ignition temperature of the air-fuel mixture. A heat medium heater comprising only a radiant heat transfer section in which at least one or more heat storage type burner systems are preheated and supplied to the high temperature as described above is provided.

Therefore, the heat medium circulating between the user and the heat medium heater is heated to a uniform temperature field near the limit temperature and with a small furnace temperature deviation while passing through the single coil of the heat medium heater. And is easily heated to a desired temperature by an even and high heat transfer amount.

That is, when the air temperature is preheated to a high temperature higher than the self-ignition temperature of the air-fuel mixture, for example, 700 ° C. or higher, the flow rate of the air injected from the burner throat is increased at a high flow rate, for example, in the conventional combustion. Several times (for example, 60 m / s
(100 m / s or more), the combustion air itself is at or above the self-ignition temperature of the fuel (air-fuel mixture), so that combustion starts when it comes into contact with the fuel. This means that no matter how low the oxygen concentration in the air-fuel mixture of the circulating flow and the air becomes, the air temperature is higher than the self-ignition temperature of the air-fuel mixture by increasing the air velocity and activating the furnace circulation. It means that the stability of combustion is maintained in the temperature range above the temperature. This increase in the circulating flow activates the flow of the furnace gas and averages the temperature of the furnace combustion gas. As a result, there is no danger of local overheating as in conventional combustion, there is no need to control combustion in accordance with the local overheating, and it is possible to raise the average temperature in the combustion chamber to near the limit temperature, greatly increasing the amount of heat transfer. A uniform temperature field with a small furnace temperature deviation can be formed while increasing the temperature. Here, in the regenerative burner system, even in an alternating combustion method in which the paired burners are alternately burned in a short time, the flow of the combustion gas and the combustion air to the regenerator is relatively controlled by rotating the regenerator. Any of the continuous combustion types in which the same burner is continuously burned by switching can be used. When the paired burners are alternately burned in a short time, the flame becomes a non-standing flame in which the flame position changes frequently, and the temperature distribution in the tube can be made more uniform. Therefore, the heat medium of the required temperature and amount can be secured only by the radiant heat transfer section composed of only the single coil. On the other hand, the combustion gas exhausted to the outside of the combustion chamber through the other burner at a high temperature is cooled to a relatively low temperature by collecting the heat in the regenerator, and is exhausted to the atmosphere. It is used to preheat the air and returned to the combustion chamber again.

Further, since the combustion gas in the furnace is actively circulated, local overheating is prevented, the furnace temperature can be flattened, and combustion is performed at a low oxygen concentration, so that NOx can be significantly reduced. And

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an embodiment shown in the drawings.

FIG. 1 is a principle view showing an example of a heat medium heater of the heat medium heater system of the present invention. The heat medium heater system mainly includes a tube, a circulation pump, and a heat medium heater that connect the user and the heat medium heater to circulate the heat medium, and heat the object to be heated through a heat medium such as oil. Indirect heating.

The heat medium heater 1 of this heat medium heater system includes a furnace body 4, a single coil-shaped heating tube 2 arranged along the inner wall surface of the furnace body 4, and a heat storage system for at least one system. The burner system 5 is provided so as to exhaust the combustion gas from the combustion chamber (inside the furnace) 3 at a high temperature so as to heat the heat medium flowing in the coil 2 mainly by radiant heat transfer.

Although not particularly limited, the furnace body 4 is formed of a cylindrical casing filled with a heat insulating material, and the openings at both ends are closed by a furnace top 7 and a furnace floor 9 made of a refractory material. I support it. The hearth 9 is provided with a manhole 22 for an operator to enter and exit the combustion chamber 3 for inspection and the like. The manhole 22 is normally closed by a manhole cover 23.

The coil 2 is formed by winding a tube of a predetermined length connected by welding or the like as necessary and winding it up in a coil shape without any gap, and is disposed along the wall surface of the cylindrical casing 4. The single coil 2 is configured so that a single coil is generally formed by sequentially winding up a plurality of paths, for example, three-pass tubes in the present embodiment with a single winding diameter. Then, headers 6i, 6 provided outside the furnace
o. Therefore, the heat medium returned from the user is distributed into three flows at the entrance side header 6i, flows through the furnace, is reunited at the outlet side with the header 6o, and is supplied to the user as one flow. At this time, since the heat medium of three passes flows as a single coil having a single winding diameter, it is uniformly heated. In addition, since only a single-diameter coil is used and it is sufficient to simply enter the inside of the cylindrical casing 4, correction after the winding operation is not necessary or correction that does not require much accuracy is sufficient. The coil 2 is supported by a heating tube support 8 embedded in a hearth 9.

A set of regenerative burner systems 5 includes a regenerator 12 and supplies combustion air and discharges combustion gas through the regenerator 12, while flowing the combustion gas and combustion air to the regenerator 12. And the combustion air is preheated to a temperature higher than the self-ignition temperature of the air-fuel mixture and supplied through the regenerator 12 heated by the heat of the combustion gas. This heat storage type burner system 5
Is installed in a part other than the furnace wall where the coil 2 is arranged, for example, in the furnace top 7 or the hearth 9, and the space 3 inside the coil 2 is burned as a combustion chamber, and the surroundings are mainly heated by radiant heat transfer. It is configured to heat the coil 2. In the case of this embodiment, a set of two burners 1 provided with a heat storage body 12
At least one regenerative burner system 5 composed of 0, 10 is mounted on the furnace top 7, and one set of burners 10,
10 and an air throat 14 and a heat storage body 12 of a burner which does not burn the combustion gas.
To be discharged. Here, the combustion gas injected toward the hearth 9 reverses and rises in the vicinity of the hearth 9, and is then exhausted from the non-burning burner.

Here, in the regenerative burner system 5, for example, the wind box 11 of each burner 10 is connected to one four-way valve 16 via a duct 19, and the four-way valve 16 supplies air for combustion. The four-way valve 16 is connected to a blower 18 and an exhaust blower 17 that discharges combustion gas via ducts 19 and 21. One of the pair of burners 10 and 10 is selectively connected to the supply blower 18 and the other is selected to the exhaust blower 17 by switching the four-way valve 16. To supply combustion air and discharge combustion gas through the regenerator 12. Further, the fuel is provided so as to be selectively injected from a fuel nozzle 13 of one of the burners 10, 10 via a three-way valve or the like (not shown). Note that reference numeral 15
Is a burner tile. In the present embodiment, the four-way valve 1
6, the air supply and the exhaust can be selectively switched. However, the present invention is not limited to this. A three-way valve is connected immediately after the heat storage body 12 provided in each air throat 14 to connect each burner. The air supply and the exhaust may be switched in synchronization with each other.

In this embodiment, the fuel nozzles 13 and 13 are provided with a refractory wind box 1 forming an air throat 14.
1 is provided at the center of the air box so as to penetrate in the air blowing direction, but is not particularly limited thereto. The fuel tank is provided so as to inject fuel from the inner peripheral surface in front of the wind box and is used for combustion flowing through the air throat 14. The fuel may intersect with the flow of air, or the fuel may be directly injected into the furnace from outside the burner tile 15.
It is sufficient that at least one fuel nozzle 13 is buried, but two or more fuel nozzles 13 may be arranged at equal intervals in the circumferential direction to perform uniform injection. still,
The fuel is not particularly limited to liquid fuel or gas fuel, and pulverized coal fuel or the like can be used. The arrangement and structure of the fuel nozzles are not particularly limited. For example, the fuel is supplied to the near side in the wind box 11 and the vicinity of the exit of the air throat 14 or outside the burner tile 15.
The fuel may be supplied stepwise, may be subjected to primary combustion with a part of the fuel and the entire amount of combustion air, and then may be subjected to secondary combustion with residual oxygen in the combustion gas and the remainder of the fuel.

The structure, composition, shape, etc. of the regenerator 12 may be any as long as it can remove the sensible heat of the flue gas when passing through it and lower the exhaust temperature from room temperature to a relatively low temperature of about 200 ° C. Can be used regardless of
In particular, it is preferable to use a honeycomb-shaped tubular body formed of fine ceramics or the like or a laminate of plate materials such as a porous metal plate or a porous ceramic plate. in this case,
The presence of the unidirectional through-holes makes it possible to increase the speed of combustion air injected into the furnace without increasing pressure loss due to extremely low pressure loss.

With the above construction, the pair of regenerative burners 10, 10 are burned alternately, and the combustion gas is exhausted through the air throat 14 and the regenerator 12 of the unburned burner. Exhaust heat of the combustion gas is recovered by the heat storage unit 12. After a lapse of a predetermined time, the burner on the opposite side where the combustion has been stopped is burned, and the combustion gas is discharged through the heat storage body 12 of the burner that has been burning until then. On the other hand, the combustion air picks up the heat stored in the regenerator 12 of the burner 10 which has been stopped, and is supplied after being preheated to a high temperature higher than the self-ignition temperature of the air-fuel mixture, for example, a high temperature of 700 to 1,000 ° C. .
This temperature is higher than the self-ignition temperature of the fuel or the mixture. Therefore, even if the flame is injected into the furnace at a high speed, the flame does not blow out. Therefore, for example, combustion air can be burned even when injected at a flow rate of 60 m / s to 100 m / s or 100 m / s or more during rated combustion. As a result, the circulation of combustion gas in the combustion chamber becomes active, and the temperature of the combustion chamber is flattened and the temperature of the furnace inside the combustion chamber is leveled, and the amount of combustion gas accompanying the flow of combustion air increases. Is greatly reduced. Then, the oxidation exothermic reaction is started at a place where the combustion air having a high temperature equal to or higher than the self-ignition temperature of the air-fuel mixture and having a low oxygen concentration comes into contact with the fuel. Also,
Since the furnace temperature can be raised to near the limit temperature with the flattening of the furnace temperature, the amount of heat transfer is increased, and the heat transfer required to heat the heat medium to the desired temperature only by the radiant heat transfer section is achieved. The amount of heat can be secured. In addition, since the self-recirculation of the combustion gas and the exhaust gas is formed by the strong circulation generated in the combustion chamber, slow combustion starts when the fuel and the combustion air come into contact with each other under a low oxygen concentration.
This combustion does not generate a local high-temperature region and forms a uniform temperature field with a small temperature deviation, so that the generation of NOx is extremely small. In addition, since there is no local high temperature region, it is possible to increase the average temperature to near the limit temperature.

Here, the switching between combustion and exhaust is performed at appropriate intervals, for example, at intervals of 10 seconds to 2 minutes, and more preferably at intervals of 20 seconds to 40 minutes.
This is performed at intervals of seconds or when the discharged combustion gas reaches a control temperature, for example, about 200 ° C. Therefore, it is possible to sufficiently utilize heat without providing a convection heat transfer unit. In addition, since the temperature in the furnace can be increased by the extent that the local high-temperature region disappears due to the temperature flattening, the amount of heat transfer can be increased, and the temperature can be increased without causing coking of the heat medium.

On the other hand, the heat medium is supplied in three passes from above the single coil 2 and is heated while flowing down the coil 2 to recover the heat lost by the user and then to the outside of the furnace. Taken out. Then, the flow of the heat medium for three passes is adjusted at the outlet side header, and then supplied to the user again.

The above embodiment is a preferred embodiment of the present invention, but the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, one set of burners is mounted on the same wall surface, but one set of burners is arranged to face different surfaces, for example, between the furnace top 7 and the hearth 9. You may do it. That is, from the furnace top 7 to the hearth 9
The combustion gas may alternately flow from the hearth 9 to the furnace top 7 toward the furnace or vice versa. Further, the heating medium heater 1 is not limited to the vertical type as shown in FIG.
Although not shown, a horizontal type is also possible. In the case of this horizontal heating medium heater, the heating medium is a coiled heating tube 2.
, While moving in the horizontal direction as a whole, along which combustion gases and flames are also formed. Further, the regenerative burner system 5 according to the present embodiment alternately switches the combustion of one set of burners 10 and 10 by passing the flow of the combustion gas and the combustion air through the stationary regenerator 12 alternately. Although the combustion system is configured, in some cases, by rotating the regenerator, the flow of combustion gas and combustion air relative to the regenerator is relatively switched to keep the burner burning constant, that is, a continuous combustion type. You may make it a regenerating burner. In this case, for example, an exhaust-only port and one burner are provided, and the combustion gas generated by the combustion of the burner is mainly exhausted from the exhaust-only port, and a rotary regenerator is arranged between these ports for combustion. The flow of air and exhaust gas relative to the regenerator is switched relatively.

[0032]

As is clear from the above description, according to the heat medium heater system of the first aspect, since it is a single tube, it is not necessary to perform the correction after winding the coil. Further, a correction jig is not required, and there is no need to change the work setup for each coil. Therefore, the cost of coil production is about 30
% And the production period can be reduced by about 50%, and the cost can be greatly reduced.

According to the present invention, there is provided a single coil, wherein the coil is directly supported on the inner wall of the furnace and is opened to a combustion chamber inside the coil, for example, a burner of a pair of burners. Since the air is exhausted from the air throat of the burner that is not used, there is no need to form a flow path (convection heat transfer section) connected to the flue port behind the coil, and it is a simple, small installation area and can be downsized. In addition, the problem of the short path is eliminated and the seal structure is not required.

Further, since all of the coils are exposed to the combustion chamber, cleaning and maintenance are easy, and safety is enhanced because the welded portion can be visually observed. In addition, the heating tube support supporting the coil can be buried in the refractory hearth so that it is not subject to high-temperature oxidative corrosion.

In addition, since the coil is a single coil, curing during transportation for maintaining the interval between the coils is not required, and a spacer such as a steel bar for preventing a coil pitch shift is not required. No need for welding time and cost.

Further, the heat medium heater system according to the present invention includes:
Since the heat medium is heated only by the radiant heat transfer from the high temperature combustion gas near the limit temperature, the heat transfer amount can be significantly increased even with a small heat transfer surface area, and the heat transfer amount at the required temperature can be reduced. It can be secured only by the radiant heat transfer part of the heat area.
For example, when obtaining the same amount of heat medium as compared with the conventional heat medium heater system, the heat transfer area can be reduced by about 30% or more.

In addition, since the combustion air preheated to a high temperature equal to or higher than the self-ignition temperature of the air-fuel mixture is obtained from the heat of the combustion exhaust gas by using the regenerator, the injection speed of the combustion air into the furnace is increased. By increasing the speed of the furnace, the flow of the gas in the furnace is activated and the temperature of the combustion gas in the furnace can be averaged. For this reason, there is no danger of local overheating unlike conventional combustion, there is no need to control combustion in accordance with the local overheating, and the average temperature in the combustion chamber can be heated to near the limit temperature. Therefore, since a single coil can be uniformly heated by forming a uniform temperature field with a small temperature deviation in the furnace, uneven heating is reduced, the life of the heat medium is prolonged, and the risk of coking is reduced. In particular, according to the second aspect of the present invention, if the paired burners are alternately burned in a short time, the flame becomes a non-standing flame in which the flame position changes frequently, and the temperature distribution in the tube can be made more uniform.

Further, the heating medium heater system of the present invention
Most of the heat other than the heat used to heat the heat medium is recovered via the heat storage medium and returned to the combustion chamber again as high-temperature combustion air, so that the heat efficiency can be increased to 85% or more. The thermal efficiency can be improved by 10% or more compared to the heater system.

Further, according to the heat medium heater system of the present invention, since local overheating is prevented, the temperature in the furnace can be flattened, and combustion is performed at a low oxygen concentration, NOx can be greatly reduced. . Further, the difference in tube heating temperature is small, and the thermal stress on the tube is reduced, which is effective in extending the life of the tube.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing one embodiment of a heat medium heater of a heat medium heater system of the present invention.

FIG. 2 is a schematic principle explanatory view showing a schematic structure of a heat medium heater system.

FIG. 3 is a central longitudinal sectional view showing a heat medium heater of a conventional heat medium heater system.

FIG. 4 is a drawing for explaining a pitch shift of a coil, and FIG.
(B) shows the state after the correction, and (B) shows the state after the correction.

FIG. 5 is a view for explaining misalignment of a coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat medium heater 2 Coil (heating tube) 3 Combustion chamber (radiant heat transfer part) 4 Cylindrical casing (furnace body) 5 Heat storage type burner system 7 Furnace top 9 Furnace floor 10 Burner 12 Heat storage body

Continuation of the front page (72) Inventor Toshiaki Hasegawa 2-53-1, Shirite, Tsurumi-ku, Yokohama-shi, Kanagawa Japan Furnace Industries Co., Ltd. (72) Inventor Shigeyuki Yoshino 3-29-5 Takada, Toshima-ku, Tokyo F-term ( Reference) 3K023 QA18 QB02 QB13 QC07 SA01 3L071 BC01

Claims (3)

[Claims] A heating medium such as oil circulating between a user and a heating medium heater connected by a tube is heated and heated by the heating medium heater to indirectly heat an object to be heated by the user. In the heat medium heater system, the heat medium heater includes a furnace body, a single coil-shaped heating tube disposed along an inner wall surface of the furnace body, and a heat storage body, and air for combustion passes through the heat storage body. Supply and discharge of the combustion gas, while the flow of the combustion gas and the combustion air to the regenerator is relatively switched so that the combustion air passes through the regenerator heated by the heat of the combustion gas and the self-ignition temperature of the mixture. A heat medium heater system comprising only a radiant heat transfer section in which at least one or more regenerative burner systems configured to preheat and supply to a high temperature are arranged. 2. The heat medium heater system according to claim 1, wherein the heat storage type burner system burns a pair of burners alternately in a short time. 3. The regenerative burner system is configured to continuously switch the flow of combustion gas and combustion air to the regenerator by rotating the regenerator to continuously burn the same burner. The heating medium heater system according to claim 1, wherein: