JP2008032235A - Superheated steam generator and superheated steam treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superheated steam generator and a superheated steam treatment device for giving more adequate and quick treatment by superheated steam depending on the condition of treated object, namely on the loaded condition, while saving energy. <P>SOLUTION: The superheated steam generator 1 comprises a steam boiler 4 for generating saturated steam using a burner 3 for heating, and a heater 6 arranged integrally with the steam boiler 4 in a casing 5 where the steam boiler 4 is provided for generating superheated steam using exhaust gas from the steam boiler 4 for heating the saturated steam generated by the steam boiler 4. The combustion amount of the burner 3 is adjustable. The combustion amount of the burner is increased to increase the generation amount of the superheated steam while increasing the temperature of the superheated steam. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a superheated steam generator that generates superheated steam, and a superheated steam processing apparatus to which a function of processing an object to be heated by this superheated steam is also added.

Superheated steam has already been used in various applications such as heating, baking, roasting, carbonization, and sterilization, and has attracted attention in many fields such as food, medical care, and environmental equipment.
For example, Patent Documents 1 and 2 disclose a home cooking apparatus that is a kind of superheated steam processing apparatus that uses superheated steam to cook. This type of relatively small superheated steam processing apparatus (heating cooking apparatus) has a first heating means 51 such as an electric heater for generating steam, as shown in FIG. The steam generator 52 is built in, and the saturated steam generated in the steam generator 52 is introduced into the processing chamber 53 in which the cooking object is stored, and the saturated steam introduced into the processing chamber 53 is The second heating means 54 such as an electric heater or a dielectric heater provided separately is heated to fill the processing chamber 53 with superheated steam, and the processing object placed in the processing chamber 53 is overheated. Cooking with steam.

  In addition, a superheated steam processing apparatus that generates a larger amount of superheated steam than this and uses the superheated steam to process an object to be processed is already known. This type of superheated steam treatment apparatus includes a boiler 71 that generates saturated steam, a heating device 72 that generates saturated steam by heating the saturated steam produced by the boiler 71, and a superheated steam treatment apparatus, as shown in FIG. A process device 80 that performs a process such as a heat treatment using superheated steam produced by the heating device 72 is provided separately. The burners 73 and 74 are separately provided for the boiler 71 and the heating device 72, respectively. Is provided. That is, in the boiler 71, saturated steam is generated by the heat from the burner 73, and in the heating device 72, the heating pipe provided in the heating device 72 is heated by the heat from the burner 74 to generate superheated steam. . In general, the burner 73 is operated while the combustion amount of the burner 73 is adjusted so that the pressure of the boiler container in the boiler 71 becomes an appropriate pressure, and the superheated steam is supplied from the heating device 72 at a predetermined discharge flow rate and a predetermined temperature. It is configured to be discharged. In the heating device 72 that heats the saturated steam, an electric heater, an IH heater, or the like may be used instead of the burner 74.

  Further, in addition to the above configuration, for example, a temperature sensor 75 for detecting the temperature of the superheated steam is attached to a location where the superheated steam of the heating device 72 is discharged, and the temperature of the location where the superheated steam is discharged in the heating device 72 becomes the set temperature. Some of them have functions that are automatically controlled. In this case, although not shown, the heating device 72 is provided with a digital input device or the like for setting and inputting the temperature of the superheated steam, and the burner 74 of the heating device 72 is automatically controlled so as to be the input set temperature. Note that X in FIG. 4 is an object to be processed by superheated steam, and 76 and 77 are exhaust gas discharge pipes for discharging exhaust gas.

When this type of superheated steam processing apparatus is used, the boiler 71 and the heating apparatus 72 are operated and superheated steam is sent into the processing chamber 82 of the processing apparatus 80.
In addition, when the heating device 72 to which the temperature control function is added is used, the person in charge observes the processing state of the processing object X in the processing chamber 82 of the process device 80, for example, the heat processing is insufficient. If it is determined that the temperature has been set, it is possible to input from the digital input device so as to increase the set temperature in the heating device 72 and make adjustments so that a favorable processing state is obtained.
Japanese Patent Laid-Open No. 11-141881 JP 2004-251478 A

  However, in any case of the superheated steam treatment apparatus as shown in FIG. 3 or the superheated steam treatment apparatus as shown in FIG. 4, the first heating means (electric heater) 51 or burner for generating saturated steam 73 and the second heating means (electric heater) 54 and the burner 74 for heating the saturated steam are required (that is, two heating means are required). There is a drawback that energy efficiency is lowered and energy saving cannot be achieved.

  In addition, when the IH heater or the like is used as the burner 74, the superheated steam treatment device shown in FIG. 4 is configured to heat only the heating pipe of the heating device 72 with the IH heater. If the saturated vapor does not flow after completion, the heating pipe of the heating device 72 may be temporarily damaged at an extremely high temperature. Therefore, a cooling device for cooling the heating pipe of the heating device 72 is separately provided so that such a problem does not occur, and the heating pipe is cooled to some extent even after the operation of the superheated steam processing apparatus is finished. Had to cool down until. For this reason, a cooling device is required, resulting in an increase in manufacturing cost, and the cooling of the heating device 72 must be continued for a while even at the end of the operation of the superheated steam processing device. The problem that it was not possible to finish it was caused.

  Further, in the superheated steam processing apparatus as shown in FIG. 4, when the superheated steam processing apparatus in which the discharge flow rate and temperature of the superheated steam are determined is used, the processing object placed in the processing chamber 82 of the process apparatus 80. Depending on the size, state, etc. of X, there may be a problem that the amount of heat at the time of processing is insufficient or excessive. In order to prevent such a problem, a staff member performs processing in the processing chamber 82 based on experience. It took a lot of time to adjust the time.

  Even when the heating device 72 to which the function of adjusting the temperature of the superheated steam discharged is added is used, in actuality, the state of the processing object put in the processing chamber 82 is judged by an attendant while observing it. Since the temperature is adjusted, in many cases, experience of a staff member is required to maintain a good processing state.

  Further, in the conventional superheated steam processing apparatus, when the amount of heat for processing the processing object X is insufficient, a staff member manually increases the set temperature of the superheated steam or separately generates saturated steam from the boiler 71. There was only a means for the staff to operate to increase the flow rate at this steam flow control valve by installing a flow meter and steam flow control valve to measure the flow rate of this, and it was not possible to quickly cope with lack of heat etc. .

  Further, as a method for coping with this, the flow rate of saturated steam is controlled by providing the flow meter, the steam flow rate control valve, and the like, and also controlling the steam flow rate control valve by the control means for controlling the combustion amount of the burner 74 of the heating device 72. Can be adjusted automatically. In this case, however, the manufacturing cost is further increased by the added flow meter and the steam flow control valve, and both the flow rate of the saturated steam and the temperature of the superheated steam are controlled by the control means. Therefore, there is a problem that the control method becomes complicated.

  The present invention solves the above-mentioned drawbacks and problems, and can save energy well, and can supply superheated steam in a good manner corresponding to the state of the object to be processed, that is, the load state. An object of the present invention is to provide a superheated steam generator and a superheated steam processing apparatus that can appropriately and quickly process an object with superheated steam.

  In order to solve the above problems and problems, the superheated steam generator of the present invention is integrated with a steam boiler that generates saturated steam by heating with a burner, and a steam boiler in a casing in which the steam boiler is provided. And a heater that generates superheated steam by heating the saturated steam generated in the steam boiler with exhaust gas that has passed through the steam boiler of the burner, and configured to adjust the combustion amount of the burner. By increasing the amount of steam, the amount of superheated steam generated is increased and at the same time the temperature of the superheated steam is increased.

  Moreover, the superheated steam generator of the present invention is provided with a control means for adjusting the combustion amount of the burner according to the temperature information related to the superheated steam in addition to the above-described configuration, and this control means reduces the temperature related to the superheated steam. Then, the combustion amount of the burner is increased, and not only the temperature of the superheated steam is raised, but also the steam generation amount of the superheated steam is increased.

  In addition, the superheated steam processing apparatus of the present invention includes the superheated steam generation apparatus and a process apparatus that introduces the superheated steam generated by the superheated steam generation apparatus and processes an object to be processed.

  In addition to the above-described configuration, the superheated steam processing apparatus of the present invention adjusts the combustion amount of the burner according to temperature detection means for detecting the temperature in the processing chamber of the process apparatus and temperature information from the temperature detection means. Control means, and the control means controls to increase the combustion amount of the burner when the temperature in the processing chamber of the process apparatus decreases.

  According to the present invention, the saturated steam generated in the steam boiler is heated by the exhaust gas that has passed through the steam boiler of the burner to generate superheated steam. Both functions of generating superheated steam by heating the steam can be achieved, and as a result, energy saving can be favorably achieved as compared with the conventional configuration that requires heating means such as two burners. . In addition, since the heater has a structure in which the exhaust gas that has passed through the steam boiler is supplied and heated, at the end of the operation of the superheated steam generator, the entire superheated steam generator is completely stopped without cooling the heater. However, the heater does not reach a very high temperature (heat-resistant temperature of the heating pipe of the heater) and does not cause any trouble. As a result, the cooling operation for the heater is performed at the end of the operation of the superheated steam generator. Without stopping, driving can be completed quickly. In addition, since the single burner performs both functions of generating saturated steam and superheated steam, increasing the combustion amount of the burner increases the amount of steam generated by the superheated steam and increases the amount of superheated steam. The temperature rises. Therefore, if the amount of heat when processing the object to be processed is insufficient, increasing the combustion amount of the burner not only increases the temperature of the superheated steam, but also increases the amount of steam generated, which leads to a shortage of heat. Can be quickly compensated, and so-called good response performance can be obtained (following the lack of heat, this shortage of heat can be quickly compensated).

  In addition, by providing a control means for adjusting the burner combustion amount according to the temperature information related to the superheated steam, it is possible to increase the burner combustion amount according to the temperature drop of the superheated steam due to the load of the processing object. As a result, superheated steam can be supplied in good response to the load of the object to be processed without requiring the experience of an attendant or taking time, and can be processed well. .

  Further, as the superheated steam processing device, a process device for processing the object to be processed by introducing the superheated steam generated by the superheated steam generating device, a temperature detecting means for detecting the temperature in the processing chamber of the process device, and this temperature detection Control means for adjusting the combustion amount of the burner according to temperature information from the means, and by controlling the control means so as to increase the combustion amount of the burner when the temperature in the processing chamber of the process device decreases, Even when the processing object is placed in the processing chamber of the process equipment and processed, even if the temperature in the processing chamber decreases due to the load of the processing object, this decrease in temperature is detected and the burner combustion amount is increased. As a result, it is possible to perform processing satisfactorily according to the load of the processing object without requiring the experience of an attendant or taking time. In addition, as the burner combustion amount increases, not only the temperature of the superheated steam rises, but the steam generation amount also increases, so it is only necessary to control the burner combustion amount according to the temperature in the processing chamber, and control is also possible. It can be done relatively easily.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the superheated steam processing apparatus according to the embodiment of the present invention introduces a superheated steam generator 1 that generates superheated steam and the superheated steam generated in the superheated steam generator 1 to be processed. The superheated steam generator 1 has a built-in control unit 20 for controlling them. The superheated steam generator 1 is integrally disposed with a steam boiler 4 that is heated by a burner 3 to generate saturated steam, and a casing 5 in which the steam boiler 4 is provided, together with the steam boiler 4. The saturated steam generated in the boiler 4 is heated by the exhaust gas from the steam boiler 4 to generate superheated steam, and the controller 20 described above. That is, the steam boiler 4 and the heater 6 are arranged side by side in one housing 5, and the steam boiler 4 and the heater 6 are heated by one burner 3. Then, the steam boiler 4 is heated by the burner 3 to generate saturated steam in the steam boiler 4, and at the same time, the heater 6 is heated by the exhaust gas of the steam boiler 4, and superheated steam is heated in the heater 6. generate.

  The saturated steam generated in the steam boiler 4 is connected to flow into the heater 6 via the first connection pipe 7. Reference numeral 9 denotes a second connection pipe for connecting the superheated steam generated by the heater 6 so as to flow into the process apparatus 2, and reference numeral 12 denotes an exhaust gas discharge pipe for discharging the exhaust gas of the superheated steam generation apparatus 1.

  Further, in this embodiment, as schematically shown in FIG. 1, the downstream side of the pipe that heats the saturated steam of the heater 6 at the upstream side in the exhaust gas flow direction of the region where the exhaust gas is discharged in the heater 6. The portion 8B is disposed, and the upstream portion 8A of the pipe for heating the saturated steam of the heater 6 is disposed at the downstream side in the exhaust gas flow direction of the region where the exhaust gas is discharged in the heater 6. As a result, the saturated steam that has flowed into the pipe of the heater 6 first flows into the downstream side of the exhaust gas flow direction where the temperature is lower because it has already absorbed heat upstream of the exhaust gas discharge region, and is heated thereafter. Then, it flows into the upstream side portion of the exhaust gas discharge region having a relatively high temperature and is heated. That is, heat is absorbed in a state where there is always a temperature difference between the exhaust heat side and the heat absorption side to some extent, so that heating is performed with good thermal efficiency. In addition, although there exists an advantage by which especially thermal efficiency becomes favorable by setting it as such an arrangement | positioning, it is not restricted to this arrangement configuration.

  The process apparatus 2 is provided with a processing chamber 10 in which the processing object X is placed, and the processing object X is processed by introducing the superheated steam generated in the superheated steam generator 1 into the processing chamber 10. Here, the processing chamber 10 is provided with a temperature sensor 11 as temperature detecting means for detecting the temperature in the processing chamber 10. Then, the control unit 20 adjusts the heating amount of the burner 3 according to the temperature information of the processing chamber 10. In this embodiment, the control unit 20 is provided with an input unit 21 for inputting a processing set temperature in the processing chamber 10, and a display unit 22 for displaying information such as the temperature of the processing chamber 10. ing. In addition, although the case where the control part 20 was incorporated in the superheated steam generator 1 was described, it is not restricted to this, Instead of incorporating the control part 20 in the superheated steam generator 1, it may be provided in the process apparatus 2. The superheated steam generator 1 and the process device 2 may be provided separately.

  The control unit 20 makes a comparison determination based on the set temperature input from the input unit 21 and the temperature information in the processing chamber 10 detected by the temperature sensor 11, and the temperature in the processing chamber 10 is low, If the difference is large, the amount of heat generated by the burner 3 is increased to increase the amount of generated heat. When the temperature in the processing chamber 10 approaches the set temperature, the amount of generated heat is reduced by decreasing the amount of combustion of the burner 3. .

Here, FIG. 2 shows the burner 3 combustion amount (actually fuel consumption), superheated steam temperature, and superheated steam flow rate (the superheated steam temperature and the superheated steam flow rate are values corresponding to the same scale on the left side. The dotted line portion indicates the superheated steam temperature, and the chain line portion indicates the heat steam flow rate.), Schematically showing the relationship with the pressure of the steam boiler 4. In the present invention, the burner 3 is controlled by the control unit 20, but as shown in the figure, the burner 3 is controlled by the control unit 20 in a state where the amount of combustion can be adjusted steplessly. In addition, since the exhaust gas from the steam boiler 4 is introduced into the heater 6 and the saturated steam is heated by the exhaust gas to generate superheated steam, the superheated steam generator 1 is increased as the combustion amount of the burner 3 increases. The temperature of the superheated steam introduced from is increased, and at the same time the steam generation flow rate of the superheated steam is increased. In other words, by increasing the amount of combustion of the burner 3, both the amount of heat absorbed in the steam boiler 4 and the amount of heat absorbed in the heater 6 are increased, so that the flow rate of saturated steam in the steam boiler 4 and thus the generation of superheated steam. The flow rate increases and the temperature of the superheated steam generated in the heater 6 also increases. That is,
While maintaining the relationship of heat quantity = f (superheated steam temperature) × superheated steam flow rate (where f (superheated steam temperature) is a function of the superheated steam temperature), depending on the temperature difference from the set temperature (target temperature) The combustion amount is adjusted.

  As a result, when the temperature of the processing chamber 10 is suddenly decreased, for example, when a large load is introduced as the processing object X into the processing chamber 10, the combustion amount of the burner 3 is automatically increased. However, at this time, not only the temperature of the superheated steam generated in the superheated steam generator 1 is raised, but also the flow rate of the superheated steam is increased at the same time, so the amount of heat given to the processing object X can be quickly increased to a large amount. It is switched, the processing object X can be heat-processed favorably and quickly, and good response performance (load following performance) can be obtained.

  In addition, when the processing object X is removed from the processing chamber 10 and the load is eliminated, or when the load is very small as the processing object X, the combustion amount of the burner 3 is also minimized, The temperature of the superheated steam generated by the superheated steam generator 1 is maintained, and the generated flow rate of the superheated steam is also kept small. Therefore, even when there is no load or when the load is small in this way, the interior of the processing chamber 10 is maintained in a stable state in response to this.

  Moreover, according to the said structure, since it comprised so that the saturated steam generated with the steam boiler 4 might be heated with the waste gas of the steam boiler 4, and a superheated steam was generated, generation | occurrence | production of saturated steam with only one burner 3, Both the heating function of generating superheated steam by heating of saturated steam can be achieved, and as a result, the manufacturing cost can be reduced and the burner can be reduced as compared with the conventional configuration requiring heating means such as two burners. In addition to reducing fuel costs, energy efficiency is improved and energy saving can be improved.

  Further, since the combustion amount of the burner 3 is adjusted according to the temperature in the processing chamber 10 of the process apparatus 2, when the processing object X is put in the processing chamber 10 and processed, the temperature in the processing chamber 10 is increased. Even when the temperature decreases, the temperature decrease is automatically detected, the amount of combustion of the burner 3 is increased, and a good heating state is adjusted. That is, it is possible to perform the processing well according to the load of the processing object X without requiring the experience of a staff member, and the work efficiency is good and the reliability is improved.

  As the burner combustion amount increases, not only the temperature of the superheated steam rises, but also the steam generation amount increases, so that the steam generation amount can also be controlled simply by controlling the burner combustion amount according to the temperature in the processing chamber. It is automatically adjusted, and as a result, the control of the control unit 20 can be performed relatively easily, and there is no increase in cost due to complicated control.

  Moreover, since the heater 6 has a structure in which the exhaust gas that has passed through the steam boiler 4 of the burner 3 is supplied and heated, the superheated steam is generated without cooling the heater 6 at the end of the operation of the superheated steam generator 1. Even if the entire apparatus is completely stopped, the heater 6 does not reach a very high temperature (more than the heat resistance temperature of the heating pipe of the heater 6). Therefore, at the end of the operation of the superheated steam generator 1, the operation of the superheated steam generator 1 can be completed quickly without causing any trouble even if the heater 6 is stopped without being cooled. . Therefore, a staff member or the like can also quickly perform work at the end of operation, and work efficiency is improved.

  In the above-described embodiment, the case where the combustion amount of the burner 3 is automatically adjusted according to the temperature in the processing chamber 10 of the process apparatus 2 is described. However, the present invention is not limited to this. The amount of combustion may be displayed as a percentage (%), and this amount of combustion may be adjusted by digital input or an operation knob or the like, and controlled accordingly.

  Further, in the above embodiment, the temperature sensor 11 is configured to detect the temperature in the processing chamber 10 of the process apparatus 2, so that even when a heavy load is introduced as the processing object X, for example. The temperature change according to the load of the processing object X can be detected quickly, and the temperature decrease can be detected and the processing object X can be heat-processed well and quickly. The case where performance) can be obtained. However, the present invention is not limited to the above embodiment, and the temperature sensor 11 may be provided in the middle path of the second connection pipe 9 that connects the superheated steam generated in the superheated steam generator 1 so as to flow into the process device 2. Alternatively, it may be disposed at the downstream end portion of the pipe for heating the saturated steam provided in the heater 6 of the superheated steam generator 1 (that is, the outlet of the superheated steam generation flow path in the superheated steam generator 1).

  Moreover, although the case where what is called a batch-type thing which takes in and out the process target object X every time as the process apparatus 2 was employ | adopted as the process apparatus 2 in the said embodiment was illustrated, I say that it is not restricted to this. Needless to say, it is possible to cope with the case of a continuous process apparatus in which a processing object is continuously taken in and out by a conveying means such as a conveyor apparatus.

  In addition, the superheated steam treatment apparatus of the present invention can be used as a superheated steam heat source for any process equipment, and its specification uses include processes other than heat treatment, such as thawing, baking, drying, sterilization, deoiling, etc. It can also be used as a treatment, oxygen-free heating or chemical reaction heat source.

  In addition, the steam boiler 4 in the above-described embodiment is not limited as long as it generates steam by burning the fuel to heat the water in the container, and is not limited to the boiler defined by the boiler rules. It goes without saying that boilers, small boilers, and the like can also be used favorably as the steam boiler 4.

  Moreover, although the case of the superheated steam processing apparatus provided with the superheated steam generator 1 and the process apparatus 2 was described in this Embodiment, it is not restricted to this, The superheated steam generator 1 is used alone as a sales system. Of course, the superheated steam generator 1 may be connected to the process device 2 sold and prepared by the user. In this case, a temperature sensor 11 or the like is assembled in the processing chamber 10 of the process apparatus 2 prepared by the user, and temperature information from the temperature sensor 11 is input to the control unit 20 provided in the superheated steam generator 1. However, the present invention is not limited to this, and as described above, a temperature sensor may be disposed and controlled at the outlet of the superheated steam generation passage in the superheated steam generator 11. Also in this case, the temperature at the temperature detection point may be displayed and controlled so as to become the input set temperature, but as described above, the combustion amount of the burner 3 is displayed as a percentage (%), You may comprise so that adjustment is possible, when a staff member etc. inputs this combustion amount.

It is the figure which showed simply the superheated steam processing apparatus concerning embodiment of this invention. It is a figure which shows the relationship between the combustion amount (actually fuel consumption) of the burner of the superheated steam processing apparatus, superheated steam temperature, superheated steam flow, and the pressure of a steam boiler. It is the figure which showed the conventional superheated steam processing apparatus simply. It is the figure which showed the other conventional superheated steam processing apparatus simply.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Superheated steam generator 2 Process apparatus 3 Burner 4 Steam boiler 5 Case 6 Heater 10 Processing chamber 11 Temperature sensor 20 Control part X Process target

Claims (4)

A steam boiler that generates saturated steam when heated by a burner;
A heater that is integrally disposed with a steam boiler in a housing provided with a steam boiler, and that generates saturated steam generated by heating the saturated steam generated in the steam boiler with exhaust gas that has passed through the steam boiler of the burner; With
A superheated steam generator configured to increase the amount of superheated steam generated and increase the temperature of the superheated steam at the same time by configuring the burner to be adjustable in combustion amount and increasing the burner combustion amount. Control means for adjusting the burner combustion amount according to the temperature information related to the superheated steam,
2. The superheated steam generator according to claim 1, wherein when the temperature related to the superheated steam decreases, the control means increases the combustion amount of the burner to increase not only the temperature of the superheated steam but also the steam generation amount of the superheated steam. .   A superheated steam generator comprising: the superheated steam generator according to claim 1; and a process device that introduces the superheated steam generated by the superheated steam generator and processes an object to be processed.   A temperature detecting means for detecting the temperature in the processing chamber of the process apparatus; and a control means for adjusting the burner combustion amount in accordance with temperature information from the temperature detecting means. The superheated steam processing device according to claim 3, wherein control is performed so as to increase the amount of combustion of the burner when the temperature decreases.

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