JP3113584U - Combustion heating chamber for external heat engines - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably use electric heat even in combination with a burner device that uses waste oil waste liquid as fuel in order to utilize heat generated in a small distributed cogeneration system using a Stirling engine as efficiently as possible. To provide a heating chamber capable of being supplied.
A heat exchange regenerator 3 is provided in a heating chamber 1 connected to one side of a heater head S1 of a Stirling engine S to circulate air introduced from the outside and lead it out again. The external air heated by circulating the high-temperature combustion gas from the apparatus B can be directly used for room heating or a drying apparatus.
[Selection] Figure 1

Description

  When supplying a heat source from a burner device to an external heat engine such as a Stirling engine having a drive unit or a heating furnace having no drive unit, the present invention is used by connecting between the external heat engine and the burner device. The present invention relates to an improvement in a heating chamber in which the heat provided by the burner device can be utilized as efficiently as possible.

  Conventionally, as a method of heating a Stirling engine, which is one of the external heat engines, combustion flames and combustion gases (collectively referred to as “combustion gases” collectively) injected from a burner device are efficiently applied to the Stirling engine heater head. In order to provide this, an insulated combustion chamber is connected to the heater head. The combustion gas that heated the heater head of the Stirling engine connected to the generator is then guided to the exhaust tower as exhaust gas, where it can be used as appropriate through the external duct to function as a cogeneration system. Composed.

  For example, Patent Document 1 discloses that, in a heating device for district heating provided with a Stirling engine, the exhaust gas of a burner that heats the Stirling engine is used as a hot water flow by a heat exchanger.

  On the other hand, Patent Document 2 discloses that heat efficiency is improved by providing a water pipe in a casing forming a heating space of a Stirling engine to generate steam. It is supposed that efficient utilization of heat is achieved by heating both the high-temperature part (heater head) of the Stirling engine and the water pipe with a burner in a casing formed in a substantially closed space.

JP 2001-509875 A JP-A-57-86546 (Claims 1 and 1)

  In the system using the conventional Stirling engine, the exhaust gas of the burner is no longer reused in the combustion system, but is only used by another medium through the heat exchanger. It was insufficient as heat utilization of the exhaust gas in the state.

  In addition, since the adjustment of the power generation amount by the generator connected to the Stirling engine, and hence the generator connected to the Stirling engine, is only controlled by the burner combustion gas injection amount that is concentrated on the heater head, In other words, there is a drawback that the electric heat generation ratio cannot be easily changed.

  By the way, the present inventor has previously proposed a burner apparatus in which waste oil and waste liquid water are emulsified and combusted in Japanese Patent Application Laid-Open No. 2000-319673 “Waste liquid water treatment apparatus by emulsion combustion”. According to this device, it is possible to reduce the size, and in order to use waste oil or the like as fuel, an extremely ideal utilization form is realized from the viewpoint of resource recycling, but various miscellaneous waste oil or the like can be used. Therefore, there is also a drawback that the amount of heat obtained from the burner device is not always stable.

  The present invention has been made to solve these conventional drawbacks, and the problem is to make the most efficient use of the heat generated in a small distributed cogeneration system. The present invention is to provide a heating chamber in order to provide a stable electric heat supply even in combination with a burner device using the waste oil waste liquid previously invented by the inventor as a fuel.

  In order to solve the desired problem, in the present invention, in a heating chamber connected to one side of the heating unit of the external heat engine, the air introduced from the outside is circulated in the heating chamber and led out to the outside again. A heat exchange regenerator is provided. For example, in a heating chamber connected between the heater head of the Stirling engine and the burner device that serves as the heat source, heat is circulated as it is with fresh external air without direct contact with the exhaust gas from the burner device. They were exchanged and used as high-temperature air for combustion in a burner device, or were led out as they were to make use of heat as gas ports.

  Furthermore, in the heating chamber according to the present invention, the inside of the heating chamber is centered on a combustion gas injection path that is injected from the burner device connected to the side facing the heating unit of the external heat engine toward the heating unit. A substantially cylindrical heat storage material is disposed, and a communication path with the space portion is provided at an end portion on the connection side with the heating portion of the external heat engine while securing a space portion between the heat storage material and the inner wall surface of the heating chamber. A heat exchange regenerator that circulates air introduced from the outside into the space portion and leads it to the outside again is disposed.

  Using a ceramic refractory containing alumina or tourmaline as a heat storage material and placing it in a position where the burner unit is directly exposed to fire or combustion gas, radiant heat with far infrared rays is applied to the heating part of the external heat engine. And high-temperature combustion gas are stably supplied, and heat exchange is arranged in the space between the inner wall surface of the heating chamber and the heat storage material, which is located downstream of the combustion gas injected into the heating part of the external heat engine It was decided to bring still high-temperature combustion gas into contact with the regenerator. The combustion gas that has passed the heat to the external air that circulates in the heat exchange regenerator is led out from the heating chamber, and heat utilization by an exhaust gas system similar to the conventional one is achieved.

  The heat storage material in the present invention can be provided with a reducer at the end of the connection side with the heating part of the external heat engine, and the position of the reducer can be attached by attaching the reducer back and forth in the direction of the jet flow path of combustion gas or the like. Therefore, the degree of concentration of the high-temperature combustion gas injected from the burner device in the heating part of the external heat engine or the flow path thereof is adjusted. Note that the reducer mentioned here includes various shapes such as a substantially conical shape and a cone shape as long as the diameter is reduced at the inlet and the outlet.

  In addition, the heat exchange regenerator according to the present invention can be attached to and detached from an endothermic jacket provided with a number of protrusions and corrugated plates on the outside while being in contact with the outer surface thereof. As the endothermic jacket referred to here, a plurality of corrugated metal bands, metal mesh elements and corrugated plates are preferably exemplified.

  Furthermore, the heat exchange regenerator in the present invention can be provided with a branch path directed to the burner device side via an opening / closing valve. This branch path is desirably arranged in the vicinity of the injection port at an acute inclination angle so as to match the injection direction of the burner device. By appropriately injecting external air that has reached a high temperature from the branch path, the amount of combustion oxygen in the burner device is adjusted, and as a result, the amount of fuel used is reduced.

  In a heating chamber provided with a heat exchange regenerator according to the present invention, it is possible to exchange heat with high-temperature exhaust gas while circulating fresh external air in the heating chamber, and to lead it outside again. It can be used as it is as a high-temperature hot air containing no substances or odors in a dryer or an indoor heating device.

  In particular, by combining with a substantially cylindrical heat storage material centered on the jet passage from the burner device toward the heating part of the external heat engine, due to the radiant heat effect from the heat storage material heated by the high-temperature combustion gas from the burner device, Even if the amount of heat applied from the burner device fluctuates, a stable heat source supply to the external heat engine can be achieved as long as it is within a certain range of variation.

  Further, by adjusting the position of the reducer provided at the front end side of the heat storage material, the flow rate of the high-temperature combustion gas from the burner device, that is, the amount injected into the heating part of the external heat engine and the heat exchange regenerator are circulated As a result of being able to change the amount, it is possible to freely control the electric heat ratio comprising the amount of power generated by the Stirling engine and the generator used as the external heat engine and the amount of heat medium generated mainly using external air.

  Furthermore, the endothermic jacket attached to the heat exchange regenerator increases the surface area of the heat exchange regenerator and increases the contact area with the high-temperature combustion gas, thereby contributing to a reduction in heat exchange loss. In particular, in burner devices that use various waste liquids as fuel, it is expected that components contained in the exhaust gas derived from the combustion gas will adhere to the surface of the endothermic jacket or heat exchange regenerator. By adopting a detachable configuration, it is possible to facilitate maintenance for the purpose of removing such deposits.

    Then, a part of the external air circulating through the heat exchange regenerator can be injected into the burner device by opening and closing the valve and used as combustion air. Thus, stable operation by increasing the temperature of the oxygen-enriched combustion gas can be achieved, and exhaust gas can be cleaned by suppressing thermal NOx.

    As described above, the heating chamber according to the present invention is composed of a Stirling engine that is connected to a generator as an external heat engine and does not discharge operating exhaust gas, and an emulsion of waste oil waste liquid developed by the present inventors. Combined with a burner system that enables combusted combustion, the combustion heating chamber of the Stirling engine and the heat exchange regenerator are in the same chamber, while controlling the electric heat generation rate by changing the flow rate of the combustion gas with a reducer, and the external air as a heat medium and combustion By using it appropriately as industrial air, a compact distributed cogeneration system that can be operated stably is realized.

    Hereinafter, a heating chamber for an external heat engine according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a heating chamber, and shows a state where the heating chamber 1 is connected and installed between a Stirling engine S as an external heat engine and a burner device B as a heat source.

    In FIG. 1, the heater head SI of the Stirling engine S is on the extension line in the jet direction from the combustion cylinder B1 of the burner device B and faces each other in a state of being fitted in the heating chamber 1, and is connected to the connection part. It is sealed with a material. The Stirling engine S placed on the slide rail S2 via the moving caster S3 can move horizontally in a direction away from the heating chamber 1, so that the Stirling engine S is heated during maintenance or the like. When moved in a direction away from the chamber 1 (right direction in the figure), the front inspection door 12 connected to the main body 11 of the heating chamber 1 via a hinge can be opened.

    On the other hand, the partition wall portion into which the burner device B is inserted is also a rear inspection door 13 connected to the main body 11 of the heating chamber 1 via a hinge, and the front surface is opened while the burner device B is inserted. Since the heating chamber 1 is configured so as to be able to perform maintenance, both the front inspection door 12 and the rear inspection door 13 are opened to perform maintenance from the front and rear inspection ports.

    However, the main body body 11 of the heating chamber 1 of the present example is formed in a substantially cylindrical body, and external air sent from the blower 2 arranged below the blower 21 through the blower pipe 21 is introduced inside. A heat exchange regenerator 3 leading out again is arranged. As will be described later, considering that a part of the external air circulating in the heat exchange regenerator 3 is used as combustion air in the burner device B, the air blower 21 is the Stirling engine S farthest from the burner device B. Connected to the bottom of the side.

    And the heat exchange regenerator 3 of the example shown in figure is similarly arrange | positioned in a substantially cylindrical shape in the space part ensured between the heat storage material 4 made into the substantially cylindrical shape, and the inner wall face of the main body trunk | drum 11 of the heating chamber 1. In FIG. 1, the heat exchange regenerator 3 shown below the main body body 11 and the heat exchange regenerator 3 shown above via the heat storage material 4 are partially or entirely connected. It is configured continuously. In this way, the blower pipe 21 is connected to the heat exchange regenerator 3 having a substantially cylindrical shape from the lower side in the tangential direction, so that the external air sent from the blower pipe 21 has a substantially cylindrical heat. The inside of the exchange regenerator 3 is circulated in a spiral shape. The external air circulated in the heat exchange regenerator 3 is led out from the high temperature air discharge pipe 31 connected to the upper part of the heat exchange regenerator 3 on the burner device B side. Is provided with a branch passage 311 having an open / close valve, and a part of the heated external air is led to the burner device B and reused as high-temperature combustion air. In this example, the branch passage 311 joins the high temperature exhaust gas introduction duct 32 so that the high temperature exhaust gas generated from another process such as an incinerator is also used for heating the burner apparatus B. .

    On the other hand, the heat storage material 4 is formed in a substantially cylindrical shape centering on the injection flow path of the high-temperature combustion gas injected from the burner device B toward the heater head S1 of the Stirling engine S, and the rear base end side is the burner device. The exhaust gas flowing outside the heat storage material 4 is disposed from the base end side of the heat storage material 4 so as to cover the combustion tube B1 of B and preferably in contact with the inner wall surface of the rear inspection door 13. It is arranged so as not to flow in the direction. The front end of the heat storage material 4, that is, the end on the connection side with the heater head S <b> 1 of the Stirling engine S is perforated with a large number of through holes to ensure a combustion gas flow path to the heat exchange regenerator 3. In this state, it is configured to be in close contact with the front inspection door 12, but is configured to be in close contact, but the enlarged diameter portion is omitted, and the length at which the connection side distal end portion is located at a position separated from the heater head S <b> 1. As an alternative, the length may be set such that a space is secured between the tip portion and the heater head S1.

    A reducer 5 is pushed inward at the front end side of the heat storage material 4, and the reducer 5 is attached so that it can be manually operated in the front-rear direction in the jet flow path direction. The front tip portion of the reducer 5 has a diameter smaller than that of the rear base end portion. When the reducer 5 is moved to the foremost position in contact with the heater head S1, the high-temperature combustion gas injected from the burner device B is transferred to the heater head S1. On the other hand, it is possible to concentrate all the hot combustion gases or the heater head S1. Conversely, when the reducer 5 is moved to the position farthest away from the heater head S1, the high-temperature combustion gas injected from the burner device B does not contact the heater head S1, but contacts the heat exchange regenerator 3 from an early stage. Will do.

    The heat exchange regenerator 3 is provided with an endothermic jacket 6. The endothermic jacket 6 of the illustrated example is made of expanded metal having a plurality of waveforms, and is mounted so as to contact the outer surface of the heat exchange regenerator 3. The corrugated shape of the expanded metal greatly increases the surface area of the heat exchange regenerator 3 itself as a large number of outward projections, so that high-temperature combustion flows without contacting the heater head S1 or contacting the heater head S1. Until the gas passes through the exhaust gas tower 15 and is sent to the outside of the heating chamber 1, the external air circulating in the heat exchange regenerator 3 is sufficiently heated. In the exhaust gas tower 15, the tip of an ejector air pipe 14 into which a part of the external air sent by the blower 2 is branched is introduced at the same axis. Exhaust gas discharge was promoted by utilizing the negative pressure generated by the external air introduced by the blower 2 to prevent the exhaust gas from staying in the heating chamber and to reduce the loss.

    A branch injection pipe 312 is provided on the burner device B side in the heat exchange regenerator 3, and the tip of the branch injection pipe 312 is directed to the combustion cylinder B 1 in the burner device B via the opening / closing valve 33. ing. However, since the heat exchange regenerator 3 and the combustion cylinder B1 of the burner device B are isolated by the heat storage material 4, the branch injection pipe 312 is provided in a state where the heat storage material 4 is perforated. The branch injection pipe 312 on the side shown in the figure is disposed so as to be inclined in the injection direction so as not to disturb the combustion gas injection from the combustion cylinder B1.

    When the external heat engine heating chamber 1 according to the present invention configured as described above is used as a combustion chamber, for example, a two-fluid water emulsion multi-burner using a water emulsion fuel of waste oil or biomass is burned as a device B, the flame temperature is reduced. It is possible to complete combustion at a low air ratio while suppressing the temperature to 800 to 1300 ° C., and clean combustion gas of NOx: 50 ppm, CO: Oppm, dust amount: 1.5 mg / □ or less to the Peterhead S1 of the Stirling engine S While being injected, it is guided to the heat exchange regenerator 3 located on the downstream side at an outlet temperature of 700 ° C. and can be operated at a final atmospheric outlet temperature of 200 ° C. or lower.

    The power generation efficiency of the generator connected to the Stirling engine S during the above operation is 25 to 35%, the heat output is 45 to 50%, and the overall efficiency is 85% or more. Therefore, noise and vibration can be suppressed to 50 decibels or less, and high heat utilization by silent operation and eventually zero emission becomes possible.

    Furthermore, the external air heated by the heat exchange regenerator 3 is mixed, and in some cases, the high temperature exhaust gas is also reused, mixed and reburned to achieve a fuel extinction rate of 40 to 90% during rated operation. can do.

3 is a cross-sectional view showing an example of an external heat engine heating chamber according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating chamber 2 Blower 3 Heat exchange regenerator 4 Thermal storage material 5 Reducer 6 Endothermic jacket 11 Body trunk part 12 Front inspection door 13 Rear inspection door 14 Ejector air pipe 15 Exhaust gas tower 21 Blower pipe 31 Hot air exhaust pipe 32 High temperature exhaust gas introduction Duct 311 Branch path 312 Branch injection pipe B Burner device B1 Combustion cylinder S Stirling engine S1 Heater head S2 Slide rail S3 Moving caster

Claims (5)

Heating for an external heat engine comprising a heat exchange regenerator that is connected to one side of the heating section of the external heat engine and that circulates air introduced from outside and circulates it outside again. Chamber. Combustion gas injected toward the heating unit from a burner device connected to the side of the heating unit of the external heat engine, which is connected to the side of the heating unit facing the heating unit. A heat storage material having a substantially cylindrical shape centering on the jet flow path is disposed, and the heat storage material secures a space between the inner wall surface of the body portion of the heating chamber main body and the heating portion of the external heat engine. A heat exchange regenerator that has a communication passage with the space at the connection side end, and circulates air introduced from the outside in the space and leads it to the outside again. Is a heating chamber for an external heat engine. 3. The heat storage material according to claim 2, wherein the heat storage material includes a reducer at a connection side end with the heating unit of the external heat engine, and the reducer is attached so as to be movable back and forth in the jet flow path direction. Heating chamber. 4. The heat exchanger regenerator for an external heat engine according to claim 1, wherein the heat exchange regenerator is detachably provided with an endothermic jacket having a large number of protrusions and corrugated plates on the outside while being in contact with the outer surface thereof. Overheat chamber. The overheat chamber for an external heat engine according to any one of claims 1 to 4, wherein the heat exchange regenerator has a branch path directed to the burner device side through an open / close valve.

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