JPH07116456B2 - Exothermic gas generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for generating an exothermic gas used for metal heat treatment and the like.

BACKGROUND ART A typical prior art is shown in FIG. 3 and its sectional view taken along section line IV-IV is shown in FIG. A combustion chamber 2 is formed by a wall 1 made of a heat insulating material, and a burner 3 is provided facing the combustion chamber 2. Raw material gas is supplied to the burner 3 and burned in the combustion chamber 2. The gas from the combustion chamber 2 is guided from a pipe line 4 to a cooling device 5 where it is cooled, is guided to a dehumidifying device 6, is guided from a pipe line 7 to a heating furnace, and is used for heat treatment of metal. A water cooling jacket 8 is provided on the wall 1, and the cooling water from the conduit 9 cools the wall 1 and is discharged from the conduit 10 as warm waste water. In this way, the temperature of the combustion chamber 2 is maintained at a constant value in order to keep the ratio of the raw material gas and air burned by the burner 3 constant. From the cooling device 5, warm waste water having a relatively high temperature is discarded.

Problems to be Solved by the Invention In such a prior art, the temperature of the hot waste water discharged from the conduit 10 is, for example, 40 ° C., and is discarded as it is. The temperature of the gas from the pipe 4 is, for example, about 600 ° C. Hot drainage from cooling temperature 5 is also drained. In this way, a large amount of heat is wasted in the prior art, and thus energy saving is desired.

An object of the present invention is to provide an exothermic gas generator that saves energy.

Means for Solving the Problems The present invention provides a furnace body made of a heat insulating material, and a combustion chamber having an outer peripheral surface made of a heat transfer wall in the furnace body, and between the inner peripheral surface of the furnace body and the outer peripheral surface of the combustion chamber. A liquid storage space formed, a burner that combusts a raw material gas in a combustion chamber to generate an exothermic gas, and a heat exchanger that is provided at the furnace body outlet of the exothermic gas and recovers sensible heat of the exothermic gas. And a cooling dehumidifying device that cools and dehumidifies the exothermic gas that has exited the heat exchange, and reheats the exothermic gas that exits the cooling and dehumidifying device by the sensible heat recovered by the heat exchanger. An exothermic gas generator characterized by the above.

Operation According to the present invention, in the combustion chamber whose outer peripheral wall is a heat transfer wall,
The burner burns the raw material gas to generate exothermic gas, and the liquid in the liquid storage space formed between the inner peripheral surface of the furnace and the outer peripheral surface of the combustion chamber is heated. In this way, the liquid in the liquid storage space is heated to a high temperature, and high-temperature steam is obtained. This high temperature liquid or vapor is effectively used.

The exothermic gas that has left the combustion chamber has a sensible heat of, for example, 300 ° C to 120 ° C due to the heat exchanger installed at its outlet.
It is recovered by being lowered to. With this, the amount of cooling water in the cooling / dehumidifying device provided at the heat exchanger outlet can be saved, and the exothermic gas cooled and dehumidified in the cooling / dehumidifying device by the sensible heat recovered in the heat exchanger, For example, it is reheated from 5 ° C to 200 ° C. As a result, a relatively high temperature dry exothermic gas can be supplied to a heating furnace for metal processing.

Embodiment FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along section line II-II of FIG. With reference to these drawings, a horizontal right cylinder-shaped furnace body 11 is made of a heat insulating material. Inside the furnace body 11, a right cylindrical cylindrical heat transfer wall 12 made of a material such as metal is provided. Inside the heat transfer wall 12, a combustion chamber 13
Is formed. A burner 15 is provided on the end wall 14 of the furnace body 11. The raw material gas is supplied to the burner 15, which burns the raw material gas in the combustion chamber 13.

A liquid storage space 17 is provided between the heat transfer wall 12 and the inner peripheral surface 16 of the furnace body 11.
Is formed, and water 18 is stored in the liquid storage space 17. Thus, the combustion in the combustion chamber 13 heats the water 18 to generate water vapor. The water vapor is led from the conduit 19 and used for various purposes.

A pipe 20 is provided on the heat transfer wall 12, and the combustion chamber is connected from the pipe 20.
The exothermic gas in 13 is guided to pass through the heat exchanger 22 and then from the pipe 23 to the cooling device 24. In the cooling device 24, the exothermic gas is cooled by the cooling water. The exothermic gas from the cooling device 24 is introduced from the pipe 25 to the dehumidifier 26 for dehumidification, and then introduced from the pipe 27 to the heat exchanger 22. In the heat exchanger 22, the exothermic gas from the pipe 27 is heated by the high-temperature exothermic gas from the pipe 20, and is supplied from the pipe 28 to the heating furnace 30 for metal heat treatment. The temperature of the exothermic gas is, for example, about 300 ° C. at the inlet side of the heat exchanger 22, about 120 ° C. in the line 23, about 10 ° C. in the line 25, and about 5 ° C. in the line 27. Yes, in pipe 28 it is about 200 ° C.

Water is supplied to the liquid storage space 17 from a pipe line 29.

In such an embodiment, water vapor that can be used for various purposes can be obtained from the conduit 19, and this water vapor can be effectively used. Therefore, significant energy saving can be achieved as compared with the above-mentioned prior art. Is possible. In addition, from the pipe 20 to the heat exchanger 22
The temperature of the exothermic gas supplied to is lower than that of the above-mentioned prior art, and the sensible heat thereof is recovered by the heat exchanger 22, so that the cooling water in the cooling device 24 can be saved. An exothermic gas of 5 ° C. is introduced from the dehumidifier 26 to the pipe 27, and the exothermic gas has a dew point of 5 ° C. In the heat exchanger 22, since the exothermic gas dehumidified to the dew point of 5 ° C. from the pipe 27 is preheated and guided to the heating furnace 30, it is possible to save energy in the heating furnace 30.

In the above-described embodiment, the water 18 is heated to obtain water vapor in the liquid storage space 17, but a liquid other than water may be stored, and a high-temperature liquid is obtained instead of vapor such as water vapor. You may be allowed to.

As described above, according to the present invention, a combustion chamber having an outer peripheral surface formed of a heat transfer wall is provided in the furnace body to heat the liquid in the liquid storage space between the inner peripheral surface of the furnace body and the outer peripheral surface of the combustion chamber. Therefore, it is possible to obtain a high-temperature liquid or vapor and use it for various purposes, and it is possible to achieve significant energy saving.

In addition, a heat exchanger is installed at the outlet of the combustion chamber, and the sensible heat of the exothermic gas generated in the combustion chamber is recovered by this heat exchanger, so the amount of cooling water in the cooling and dehumidifying device that follows is saved. Therefore, the exothermic gas after cooling and dehumidifying can be reheated by the sensible heat recovered by the heat exchanger, and further energy saving can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along section line II-II of FIG. 1, and FIG. 3 is a sectional view of a prior art. FIG. 4 is a sectional view taken along the section line IV-IV in FIG. 11 ... Furnace body, 12 ... Heat transfer wall, 13 ... Combustion chamber, 15 ... Burner, 17 ... Liquid storage space, 18 ... Water, 22 ... Heat exchanger,
24 ... Cooling device, 26 ... Dehumidifying device, 30 ... Heating furnace

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuniaki Honda, 5-1, Hirano-cho, Higashi-ku, Osaka City, Osaka Prefecture Osaka Osaka Gas Co., Ltd. (72) Toshio Kihira 7-5-304, Nakahama-cho, Nishinomiya-shi, Hyogo ( 72) Inventor Takao Tanabe 5-8-66 Kobayashi, Takarazuka-shi, Hyogo (72) Inventor Shoichi Fujimura 7-5-205 Nakahama-cho, Nishinomiya-shi, Hyogo (56) Reference JP-A-57-200492 (JP, A) ) JP-A-51-5302 (JP, A) JP-A-61-64789 (JP, A)

Claims (1)

[Claims] 1. A furnace body made of a heat insulating material, a combustion chamber having an outer peripheral surface formed of a heat transfer wall in the furnace body, and a liquid storage space formed between the inner peripheral surface of the furnace body and the outer peripheral surface of the combustion chamber. A burner that burns the raw material gas in the combustion chamber to generate a heat generating gas; a heat exchanger that is provided at the furnace body outlet of the heat generating gas and recovers sensible heat of the heat generating gas; A cooling type dehumidifying device for cooling and dehumidifying the exothermic type gas, wherein the exothermic type gas discharged from the cooling dehumidifying device is reheated by the sensible heat collected by the heat exchanger. Gas generator.