JPH11280921A - High temperature gas selector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain heat resistance and heat insulation by making double acting pneumatic pistons and cylinders direct-coupled to mushroom valves and valve stems of the mushroom valves of ceramics, and isolating an operating solenoid valve by a long piping. SOLUTION: A heat reservoir 1 is increased in temperature by preheat air to come to a high temperature, and the air is released from the right outlet through a high temperature preheat air mushroom valve 5. When the air temperature is lowered below a regulated value, the high temperature preheat air mushroom valve 5 is closed, and on the contrary, a high temperature waste gas mushroom valve 4 is opened so that high temperature waste gas is let flow in through the left inlet, thereby reheating the heat reservoir 1 through the high temperature waste gas mushroom valve 4 to store heat. Servo pneumatic pistons 8, 9 and servo air cylinders 10, 11 direct-coupled to the mushroom valves 4, 5 and the valve stems 6, 7 of the valve mushroom valves 4, 5 are made of ceramics because they are in contact with high temperature preheat air, and an operating solenoid valve 13 is installed in an isolated place not to be influenced by high temperature by a long piping 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature heat exchanger for energy saving and high-temperature combustion, and has many uses especially for preheating air.

[0002]

2. Description of the Related Art Conventional heat exchangers for preheating air include heat exchangers of a heat transfer surface type such as a steel pipe type or a steel plate type, and a regeneration type of a thin steel plate heat storage type.
It is a so-called Jungstrom heat exchanger or the like, and large-scale high-temperature heat exchange for a blast furnace stores heat in a brick and switches high-temperature gas by a water-cooled butterfly valve or the like. Recently, a sophisticated system that integrates a burner and a ceramic regenerator and switches between multiple burners and the circuit in the low-temperature section to avoid switching in the high-temperature section has been used mainly for heating furnaces. .

[0003]

The purpose of the present invention is to obtain standardized, high-efficiency, high-temperature heat exchange which is easy to handle, and is of a heat storage type which is suitable for high temperatures and is economical. Various types of heat storage materials such as bricks and ceramics can be used, and in some cases, inexpensive materials such as crushed stones can be used. However, there is no suitable high-temperature switching valve that is indispensable for the heat storage type. The integrated type of the heat storage body and the burner which avoids this requires a plurality of burners and repeats ignition with a delicate surface, and is difficult to apply in other types such as stoker combustion. At present, due to environmental issues, melting high-temperature incineration of waste is required to reduce the generation of dioxins and detoxify ash.
Naturally, the original high-temperature heat storage type heat exchange of the high-temperature switching valve type is required. In contrast, a blast furnace water-cooled butterfly valve
It is bulky and troublesome, and heat loss due to water cooling is large. What is more demanding at present is smaller applications, and the heat loss ratio increases as the size becomes smaller.

[0004]

Various components have been ceramized with the advancement of ceramic technology. This is also applied to the present switching valve, but in this case, a too complicated shape is inappropriate, and a mushroom valve, which has been studied in an internal combustion engine, is desirable. In addition, as in the case of the internal combustion engine, if the number is increased, the capacity can be reduced in size. Furthermore, when electric parts or hydraulic parts are used as the valve drive mechanism, there is a great risk of damage due to high heat. Therefore, pneumatic pistons and cylinders are used instead. However, even at this time, electrical parts that are sensitive to high heat such as solenoid valves are required for intermittent control air, but place the solenoid valve in a location far from high heat and connect with a pneumatic piston with thin air piping,
Cut off high heat. With the pneumatic drive, the mushroom valve can be easily driven by being directly connected to the pneumatic piston, and since it is a double-acting type, heat-resistant and metal parts such as a problematic spring are not required. With such a configuration, the height is reduced and the device is compact. The internal pressure of the heat exchanger is generally low and a low pressure of the pneumatic piston is sufficient. Lubricating oil for the pneumatic piston is also unnecessary because it is a ceramic piston, and oil that is vulnerable to high heat can be eliminated.

[0005]

An embodiment will be described with reference to the drawings. FIG. 1 shows an overall configuration diagram of the present invention. 1 is a heat storage body. When it is compact, it is precision molded with ceramic,
When economics are the main, crushed stones shall be used. 2 is a valve configuration for high-temperature waste gas, and 3 is a valve configuration for high-temperature preheated air. Each is connected to a high-temperature waste gas generation port and a high-temperature preheated air supply port. Reference numeral 4 denotes a high-temperature waste gas mushroom valve, which is in a closed state, and 5 is a high-temperature preheated air mushroom valve, which is in an open state. So now we have hot preheated air,
This is a state in which the heat is generated by heat release from the heat storage body 1. The preheated air rises in the regenerator 1 to a high temperature, passes through the hot preheated air mushroom valve 5, and exits from the right outlet. When a certain heat radiation time elapses and the air temperature falls below a specified value, this valve closes, and conversely, the hot waste gas mushroom valve 4 opens, and the hot waste gas flows in from the left inlet and passes through the valve to store heat. The body 1 flows down, reheats, raises the temperature, and stores heat. Reference numeral 6 denotes a high-temperature waste gas stem, which is also made of ceramic because it comes into contact with the high-temperature waste gas. Reference numeral 7 denotes a high-temperature preheated air valve stem, which is also made of ceramic because it comes into contact with the high-temperature preheated air. Numeral 8 denotes a servo air piston, which is also made of ceramic because the temperature becomes high due to the heat conduction of the high-temperature waste gas. Reference numeral 9 also denotes a servo air piston, which is also made of ceramic because the temperature becomes high due to the heat conduction of the high-temperature preheated air. Reference numerals 10 and 11 denote servo air cylinders, which are also made of ceramics because they become high in temperature due to heat conduction in a high temperature environment. In addition, the entire surrounding area is covered with a heat insulating material to prevent heat radiation and save energy. Although only a pair of valves are shown in this figure, it is naturally necessary to combine a plurality of pairs of valves with their phases shifted evenly for continuous operation. The low temperature inlet valve is provided symmetrically below. Because of this low temperature, ordinary steel valves are sufficient. Numeral 12 is a servo air pipe, which places a thin pipe at a long distance, so that a ceramic pipe is sufficient for a place close to the cylinder, but a normal steel pipe is sufficient for other places. Numeral 13 denotes a solenoid valve which sends double-acting servo air to a servo air cylinder to open and close the valve. However, since the solenoid valve is installed in a distant place without the influence of high heat, a normal solenoid valve can be used.

[0006]

As described above, a high-efficiency and stable regenerative heat exchanger utilizing high-temperature waste gas can be realized as a standard, and a high energy-saving effect can be obtained. It is advantageously used for high-temperature incineration of waste to prevent the generation of dioxins, and has a wide application range not only in the field of high temperature but also in the field of low temperature as a solution to the conventional disadvantages of air preheaters.

[Brief description of the drawings]

FIG. 1 shows an overall configuration diagram of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat storage unit 2 high-temperature waste gas valve configuration 3 high-temperature preheat air valve configuration 4 high-temperature waste gas mushroom valve 5 high-temperature preheat air mushroom valve 6 high-temperature waste gas valve stem 7 high-temperature preheat air valve stem 8 servo air piston 9 servo air piston 10 Servo air cylinder 11 Servo air cylinder 12 Servo air piping 13 Solenoid valve

Claims (1)

[Claims] 1. A mushroom valve made of ceramic, a double-acting pneumatic piston and cylinder directly connected to the valve stem are also made of ceramic, and a solenoid valve for operation is a compact, heat-resistant and heat-insulated high-temperature gas separated by a long pipe. Switching valve.