EP-4123223-B1 - HEAT TREATMENT SYSTEM

Inventors

• AGAWA, Ryuichi
• TETSUYAMA, Ishhu

Dates

Publication Date

20260506

Application Date

20210315

Claims (4)

1. A heat treatment system (1) comprising: a pyrolysis furnace (10) that pyrolyzes a raw material to produce a pyrolysis product; a co-current rotary kiln (11) that heats an object to be heated using the pyrolysis product produced in the pyrolysis furnace (10); a heat recovery device (13) configured to recover heat of exhaust gas exhausted from the rotary kiln (11) with vapor; an air preheater (81); a first duct (82) configured to send the vapor from the heat recovery device (13) to the air preheater (81); and a second duct (80) configured to introduce combustion air to the air preheater (81) to be heated by the vapor, and to introduce the heated combustion air from the air preheater (81) into the pyrolysis furnace (10), wherein the pyrolysis furnace (10) is configured to pyrolyze the raw material using the heated combustion air to produce the pyrolysis product.
2. The heat treatment system (1) according to claim 1, wherein the object to be heated is waste.
3. The heat treatment system (1) according to claim 1 or 2, wherein the raw material includes a biomass raw material.
4. The heat treatment system (1) according to any one of claims 1 to 3, wherein the pyrolysis product produced in the pyrolysis furnace (10) is configured to be sent to the rotary kiln (11) without being heat-recovered.

Description

Technical Field The present invention relates to a heat treatment system. Background Art In some heat treatment systems that perform waste treatment or the like, there is a heat treatment system using a co-current rotary kiln. The co-current rotary kiln has a cylindrical rotary furnace that rotates around an axis and performs treatment by introducing a heating burner and waste from the same end part of the rotary furnace in the same direction (for example, refer to PTL 1). In the rotary kilns, there is a so-called counter-current rotary kiln that performs treatment by introducing the heating burner and the waste from the different end parts of the rotary furnace in an opposite direction. Compared to the counter-current rotary kiln, the above-described co-current rotary kiln can perform the treatment at a high temperature without unevenness in a short time, and is suitable for the waste treatment. PTL 2 discloses a heat treatment system comprising a pyrolysis furnace that pyrolyses a raw material to produce a pyrolysis product (i.e. pyrolysis gas); and a co-current rotary kiln that heats an object to be heated (i.e. cement raw material) using the pyrolysis product produced in the pyrolysis furnace. Waste heat from an air quenching cooler is used to elevate the air temperature for the pyrolysis furnace by means of a gas-air heater. Incidentally, fossil fuels such as heavy oil and city gas have been conventionally used as a fuel for the heating burner of the co-current rotary kiln. Citation List Patent Literature [PTL 1] Japanese Unexamined Patent Publication No. 2010-216763[PTL 2] EP 2631220 A1 Summary of Invention Technical Problem However, in recent years, because of issues such as a climate change caused by an increase in CO2 emissions, restrictions on use of the fossil fuel have become stricter, and it has become desirable to use alternative fuels other than the fossil fuel. The present invention has been made in view of such points, and an object of the present invention is to provide a heat treatment system capable of performing heat treatment of an object to be heated such as waste without using a fossil fuel as a main fuel in the co-current rotary kiln. Solution to Problem A heat treatment system according to one aspect of the present invention includes a pyrolysis furnace that pyrolyzes a raw material to produce a pyrolysis product and a co-current rotary kiln that heats an object to be heated using the pyrolysis product produced in the pyrolysis furnace, in which the pyrolysis furnace includes a main body container configured to pyrolyze the raw material to produce the pyrolysis product, a separation part configured to separate a circulation material from a high-temperature fluid, a first duct configured to send the high-temperature fluid containing the pyrolysis product and the circulation material from the main body container to the separation part, a second duct configured to return the circulation material separated by the separation part to the main body container, and a third duct configured to send the high-temperature fluid from which the circulation material has been removed and containing the pyrolysis product to the rotary kiln. According to the aspect, in the co-current rotary kiln, the pyrolysis product produced in the pyrolysis furnace can be used to heat the object to be heated, so that the heat treatment of the object to be heated can be performed at a high temperature in a short time without using a fossil fuel as a main fuel. The heat treatment system may further include a heat recovery device that recovers heat of exhaust gas exhausted from the rotary kiln. The heat treatment system may further include a device that uses heat of exhaust gas exhausted from the rotary kiln as a heat source for the pyrolysis furnace. The object to be heated may be waste. The raw material may include a biomass raw material. The heat treatment system may be configured such that the pyrolysis product produced in the pyrolysis furnace is sent to the rotary kiln without being heat-recovered. Advantageous Effects of Invention According to the present invention, it is possible to provide a heat treatment system capable of performing heat treatment of an object to be heated without using a fossil fuel as a main fuel in the co-current rotary kiln. Brief Description of Drawings Fig. 1 is a schematic diagram showing an outline of a configuration of a heat treatment system not covered by the present invention.Fig. 2 is a schematic diagram showing an outline of another configuration of the heat treatment system according to the present invention.Fig. 3 is a schematic diagram showing an outline of still another configuration of the heat treatment system not covered by the present invention. Description of Embodiments Hereinafter, embodiments will be described with reference to the drawings. The same elements are denoted by the same reference numerals, and overlapping description is omitted. Further, the dimensiona