JP2001263953A - Heat source device for drying - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source device for drying capable of contriving energy saving by utilizing the waste heat of a gas turbine as a heat source for drying. SOLUTION: This heat source device for drying is provided with an exhaust gas discharging system 2 communicating with a heat storage type heat exchanger 1 through an exhaust gas boiler 5, a drying air supplying system 3 communicating with a drying furnace 7 through the heat storage type heat exchanger 1, and a drying steam supplying system 8 communicating with a drying air header 11 through the exhaust gas boiler 5 and an electromagnetic induction heating device 10. The heat storage type heat exchanger 1 is provided with a plurality of heat exchanging chambers in which a heat storage element is installed, while connecting the exhaust gas discharging system 2 to the drying air supplying system 3 switchably through damper devices 15a-15q, and the electromagnetic induction heating device 10 is provided with an electromagnetic induction heat generating body arranged in the tubular body of the same while a high-frequency inverter is connected to a work coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat source apparatus for drying, and more particularly to an energy saving technique for supplying waste heat of a gas turbine to a drying means such as a drying furnace in a factory for building materials.

[0002]

2. Description of the Related Art Conventionally, for example, in a building material manufacturing plant, a substrate formed by a molding machine by a drying process in a drying furnace and a curing process under a high temperature and a high pressure in an autoclave is used to produce a base material. The paint is dried by the heat of the steam ejected from the dry air header and the oven.

[0003]

However, in the above-mentioned conventional manufacturing plant, a drying furnace, a drying air header and the like are provided with a dedicated heat supply source, respectively, while the exhaust gas is discharged from a gas turbine generator provided in the plant. Waste heat was not fully utilized.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a drying heat source device that can save energy by using waste heat of a gas turbine as a drying heat source. .

[0005]

In order to solve the above-mentioned problems, a heat source device for drying according to the present invention comprises a regenerative heat exchanger, a base end communicating with an exhaust port of a gas turbine, and a tip end provided with an exhaust gas boiler. An exhaust gas discharge system that communicates with the regenerative heat exchanger through the air, a drying air supply system that communicates with the blower at the base end and communicates with the first drying means through the regenerative heat exchanger at the distal end, and a water supply source at the base end A drying steam supply system communicating with the second drying means through the exhaust gas boiler and the electromagnetic induction heating device while communicating with the exhaust gas boiler; the regenerative heat exchanger has a plurality of heat exchange chambers; A plurality of heat storage elements forming a heat exchange element for receiving and radiating heat are left standing, and each of the heat exchange chambers is switchably connected to an exhaust gas discharge system and a drying air supply system via flow path switching means. Become The induction heating device has a configuration in which a work coil is arranged around a cylinder that forms a steam flow path, an electromagnetic induction heating element is arranged inside the cylinder, and a high-frequency inverter is connected to the work coil. is there.

[0006] With the above configuration, during the heat storage operation in the heat storage type heat exchanger, the exhaust gas discharge system is connected to the heat exchange chamber of the heat storage type heat exchanger by operating the flow path switching means. Exhaust gas from the gas turbine that flows into the heat exchange chamber of the regenerative heat exchanger through the exhaust gas discharge system flows through the gaps between the plurality of heat storage elements that form the heat exchange elements, heats the heat storage elements, and then heats the heat exchange chamber. Spill out of. During this time, the heat storage element of the heat storage type heat exchanger stores high-temperature heat by receiving heat from exhaust gas in a high temperature range.

At the time of the heat radiation operation, the air supply system for drying is connected to the heat exchange chamber of the regenerative heat exchanger by operating the flow path switching means. The drying air flowing from the upstream pipe of the drying air supply system into the heat exchange chamber of the regenerative heat exchanger circulates through the gap between the plurality of heat storage elements forming the heat exchange element, and the heat storage element radiates heat. After depriving the heat and raising the temperature, it flows into the first drying means from the heat exchange chamber through the downstream piping of the drying air supply system.

[0008] By connecting a plurality of heat exchange chambers in parallel, it is possible to perform a heat dissipation operation in another heat exchange chamber in a state where the heat storage operation is performed in one heat exchange chamber. By performing the above steps differently and repeatedly, heat exchange between the exhaust gas and the drying air can be continuously performed via the heat storage element, so that the drying air at a stable temperature can be always supplied.

[0009] The steam generated and heated by the exhaust gas boiler using the exhaust gas of the gas turbine as a heat source is guided to an electromagnetic induction heating device to be heated. In the electromagnetic induction heating device, a change in a magnetic field generated by a work coil causes an electromagnetic induction heating element to generate heat by electromagnetic induction to heat steam flowing through a cylinder. The heated drying steam is supplied to the second drying means through a drying steam supply system.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, an exhaust gas discharge system 2 and a drying air supply system 3 communicate with a regenerative heat exchanger 1. The exhaust gas discharge system 2 has a base end communicating with an exhaust port of the gas turbine generator 4 and a distal end communicating with the regenerative heat exchanger 1 through an exhaust gas boiler 5. The drying air supply system 3 has a proximal end communicating with the blower 6 and a distal end communicating with the drying furnace 7 through the regenerative heat exchanger 1. The drying furnace 7 is for drying the dough made of cement or the like to form the base material of the building material.

The exhaust gas boiler 5 has a drying steam supply system 8.
The steam supply system 8 for drying has a pipe 8a communicating with a water supply source at the base end and a turbine supply port of the steam turbine generator 9 at the tip end through the exhaust gas boiler 5 and an electromagnetic induction heating device. 10 and a pipe 8b communicating with the dry air header 11.

The drying air header 11 forms a steam curtain for drying the coating applied to the substrate to be dried by ejecting the drying steam, and the oven 12 bake the coating on the substrate. It is for.

As shown in FIG. 2, the regenerative heat exchanger 1 comprises:
It has a plurality of heat exchange chambers 13a to 13c.
A plurality of heat storage elements 14 serving as heat exchange elements for receiving and radiating heat are set aside in a to 13c. The heat storage element 14 is made of a heat-resistant member such as a honeycomb ceramic having a porous body or a ceramic ball having a particle diameter of 10 to 50 mm. Each heat exchange chamber 13a to 13c
Are a plurality of damper devices 15a to 15q forming a flow path switching means.
The exhaust gas discharge system 2 and the drying air supply system 3 are switchable and connected in parallel via the.

As shown in FIG. 3, the electromagnetic induction heating device 10
Disposes a work coil 17 around a cylindrical body 16 made of a non-metallic pipe or the like forming a steam flow path,
A fin-shaped electromagnetic induction heating element 18 is arranged in a honeycomb structure or the like inside the inside, and a high-frequency inverter 19 is connected to the work coil 17.

The operation of the above configuration will be described below. Since the heat storage operation and the heat radiation operation in each of the heat exchange chambers 13a to 13c of the heat storage type heat exchanger 1 are the same, the operation in one heat exchange chamber 13a will be exemplified here.

During the heat storage operation, the damper devices 15a, 15
d, the damper device 15g is closed, the exhaust gas discharge system 2 is connected to the heat exchange chamber 13, and the damper device 15g is closed.
j, 15m are closed and the drying air supply system 8 and the heat exchange chamber 1 are closed.
3 is shut off.

In this state, the exhaust gas of the gas turbine generator flowing into the heat exchange chamber 13a from the upstream pipe of the exhaust gas discharge system 2 flows through the gap between the plurality of heat storage elements 14 forming the heat exchange element. After the heat storage element 14 is heated, it flows out of the heat exchange chamber 13 a to the downstream pipe of the exhaust gas discharge system 2. During this time, the heat storage element 14 stores high-temperature heat by receiving heat from exhaust gas in a high-temperature range.

The exhaust gas is discharged to the atmosphere with the damper device 15p opened, or supplied to the oven 12 or the inlet of the drying furnace 7 with the damper device 15q opened to be used as a heat source for drying. Alternatively, the damper device 15 is transferred to one of the other heat exchange chambers 13b and 13c after the heat radiation operation described later.
h or 15i is released and supplied to the heat storage element 1
Heat 4

At the time of heat radiation operation, the damper devices 15a, 15
The exhaust gas discharge system 2 and the heat exchange chamber 13 are shut off by closing d and 15 g, and the damper devices 15 j and 15 m are opened to connect the drying air supply system 8 and the heat exchange chamber 13.

In this state, the drying air flowing into the heat exchange chamber 13a from the upstream pipe of the drying air supply system 3 flows through the gaps between the plurality of heat storage elements 14, and the heat storage elements 14 radiate heat. After the heat is removed by taking the heat from the heat exchange chamber 13a, the heat flows from the heat exchange chamber 13a to the drying furnace 7 through the downstream pipe of the drying air supply system 3, and is used as a drying heat source.

Since each of the heat exchange chambers 13a to 13c is connected in parallel, any one of the heat exchange chambers 13a to 13c performs a heat storage operation while the other heat exchange chambers 13a to 13c are connected.
3c, the heat radiation operation can be performed.
By repeatedly performing the heat storage operation and the heat radiation operation differently in 3a to 13c, heat exchange between the exhaust gas and the drying air can be continuously performed via the heat storage element 14, so that the drying at a stable temperature is always performed. Supply air. Moreover, the heat exchange chambers 13a to 13a
13c, heat exchange chambers 13a to 13 which are performing a heat radiation operation.
Heat efficiency is improved by heating the heat storage element 14 by supplying the exhaust gas discharged from c.

The drying steam flowing into the electromagnetic induction heating device 10 through the drying steam supply system 9 is preheated by the exhaust gas boiler 5. In the electromagnetic induction heating device 10, the current supplied to the work coil 17 is intermittently cut off by the high-frequency inverter 19, and the change in the magnetic field generated in the work coil 17 causes the electromagnetic induction heating element 18 to generate heat by electromagnetic induction. The steam flowing inside the body 16 is heated. The heated drying steam is supplied to the drying air header 11 through the drying steam supply system 8.

[0023]

As described above, according to the present invention, the waste heat of the gas turbine is received by the heat storage element during the heat storage operation to store high-temperature heat, and the heat radiated by the heat storage element during the heat radiation operation is taken away. The temperature of the drying air rises, and the heat storage operation and the heat radiation operation are performed differently and repeatedly in each heat exchange chamber, thereby continuously performing heat exchange between the exhaust gas and the drying air through the heat storage element. It is possible to always supply stable drying air. By heating the steam generated and heated by the exhaust gas boiler using the exhaust gas of the gas turbine as a heat source by the electromagnetic induction heating device, the drying steam (hot air) can be stably supplied.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a configuration of a drying heat source device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a regenerative heat exchanger according to the embodiment.

FIG. 3 is a schematic diagram showing a configuration of an electromagnetic induction heating device in the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 regenerative heat exchanger 2 exhaust gas discharge system 3 drying air supply system 4 gas turbine generator 5 exhaust gas boiler 6 blower 7 drying furnace 8 drying steam supply system 9 steam turbine generator 10 electromagnetic induction heating device 11 drying air header 12 Oven 13a to 13c Heat exchange chamber 14 Heat storage element 15a to 15q Damper device 16 Cylindrical body 17 Work coil 18 Electromagnetic induction heating element 19 Inverter

Claims (1)

[Claims] 1. A regenerative heat exchanger, an exhaust gas discharge system having a base end communicating with an exhaust port of a gas turbine and a distal end communicating with a regenerative heat exchanger through an exhaust gas boiler, and a base end communicating with a blower. A drying air supply system in which the distal end communicates with the first drying means through a regenerative heat exchanger, and a drying air supply system in which the proximal end communicates with a water supply source and the distal end communicates with the second drying means through an exhaust gas boiler and an electromagnetic induction heating device. The heat storage type heat exchanger has a plurality of heat exchange chambers, and has a plurality of heat storage elements that serve as heat exchange elements for receiving and radiating heat in each heat exchange chamber. The exhaust gas discharge system and the drying air supply system are switchably connected to the heat exchange chamber via flow path switching means. The electromagnetic induction heating device has a work coil arranged around a cylinder that forms a steam flow path. Then To, to place the electromagnetic induction heating element in the interior of the tubular body, the drying heat source apparatus characterized by comprising connecting the high-frequency inverter to the work coil.