CN112601308B - Combined induction heating system for heating large-flow air - Google Patents
Combined induction heating system for heating large-flow air Download PDFInfo
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- CN112601308B CN112601308B CN202011487973.4A CN202011487973A CN112601308B CN 112601308 B CN112601308 B CN 112601308B CN 202011487973 A CN202011487973 A CN 202011487973A CN 112601308 B CN112601308 B CN 112601308B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a combined induction heating system for heating high-flow air, which comprises a low-temperature heater, a medium-temperature heater, a high-temperature heater, a computer control system, a low-temperature heating power supply, a medium-temperature heating power supply, a direct-current high-temperature heating power supply and a high-frequency induction heating power supply, wherein the low-temperature heater, the medium-temperature heater and the high-temperature heater are sequentially arranged on an air pipeline, high-temperature valves are arranged between the low-temperature heater and the medium-temperature heater, the computer control system respectively controls the low-temperature and the medium-temperature heaters to work, the high-temperature heater comprises a plurality of high-temperature single heating units, the high-temperature single heating units are tubular heating bodies, the inside of each tubular heating body is formed by zirconia composite materials, iron metal is sealed in the tubular heating units, and the outer walls of the tubular heating units are provided with induction heaters. The invention starts the high-temperature heating of the rear end by utilizing the temperature of the low-temperature heating of the front end, and the high-temperature heating body adopts the zirconia composite heating element, thereby solving the problem of oxidization generated by high-temperature heating of large-flow air.
Description
Technical Field
The invention relates to the field of hypersonic high-flow air cleaning and heating wind tunnels and the field of high-temperature air heating industry.
Background
There have been many studies on a large flow rate of pure air heater in the past several decades, and two types of heaters for heating air are mainly used at present, one is a continuous heater and the other is a regenerative heater. The continuous pure air heater can heat the test air flow for a long time according to the test requirement; whereas storage heaters are limited by the storage material and the airflow, they can only provide the hot gas flow at the temperature required for the test for a limited period of time. When the material of the heating element or the heat storage material adopts high temperature resistant metal, the two heaters can heat pure air to 1000K, but when the pure air is required to be heated to more than 1000K, the current continuous heater cannot be satisfied, and the heat storage heater of the nonmetallic heat storage material is required to be adopted. The regenerative heaters are classified into two types, one type is a graphite heater and the other type is a metal oxide heater. The graphite heater heats nitrogen by adopting electric induction and then is mixed with oxygen to obtain high-temperature pure air. The temperature of the pure air flow obtained by the heater reaches 1700K-1900K, but pure nitrogen is heated to avoid oxidation of graphite at high temperature, and then oxygen with a certain proportion is mixed to achieve the components of the pure air. The first heat accumulating material for the metal oxide heater is high purity alumina, and the alumina is made into small ball heat accumulator with pure air temperature up to 1700-1800K. However, the temperature of the purified air actually obtained by the domestic operated heater is about 1100K, the effective operation time is about 1 minute, and the long-time test requirement of the large-flow purified air under the high Mach number can not be met.
To sum up, the most main reasons for the current high flow clean air heating technology at the limit of high mach numbers are as follows:
1) The heat accumulator material is concentrated on the aspects of high-purity metal oxide and graphite heater, but no breakthrough is made in the aspects of heat accumulator material and process at present;
2) Further increase of the gas heating temperature, which results in that the traditional heat storage materials and heating technology can not meet the requirements;
3) The foreign pure heating technology has a breakthrough in temperature, but the running time still does not meet the test requirement.
Therefore, no effective solution for the system exists at home and abroad.
Disclosure of Invention
The technical problems solved by the invention are as follows: the invention mainly solves the problem of long-time clean heating of large-flow air under high Mach number, and is a high Mach number wind tunnel and all working environments requiring high-temperature pure air.
The combined induction heating system for heating high-flow air comprises a low-temperature heater, a medium-temperature heater, a high-temperature heater, a computer control system, a low-temperature heating power supply, a medium-temperature heating power supply, a direct-current high-temperature heating power supply and a high-frequency induction heating power supply, wherein the low-temperature heater, the medium-temperature heater and the high-temperature heater are sequentially arranged on an air pipeline, high-temperature valves are arranged between the low-temperature heater and the medium-temperature heater, the computer control system respectively controls the low-temperature heater and the medium-temperature heater to work through the low-temperature heating power supply and the medium-temperature heating power supply, and controls the high-temperature heater to work through the direct-current high-temperature heating power supply and the high-frequency induction heating power supply, the high-temperature heater comprises a plurality of high-temperature single heating units, the high-temperature single heating units are tubular with iron metal enclosed inside and formed by zirconia composite materials, and induction heaters are arranged on the outer walls of the high-temperature single heating units.
Preferably, the low temperature heater and the medium temperature heater are currently established metal heaters.
Preferably, the induction coil of the induction heater is cooled by water.
Preferably, a plurality of the high-temperature single heating units are arranged inside a pipeline with a refractory lining and are arranged along the axis of the pipeline, and the high-temperature single heating units are respectively connected with an external high-frequency induction heating power supply and a direct-current high-temperature heating power supply through flanges on two sides of the pipeline by means of a high-frequency induction cable and a direct-current heating cable.
Preferably, the two ends of the tubular heating element are provided with DC electrodes for connecting a DC heating cable
The invention adopts the traditional metal heater, induction heater and high temperature resistant oxidation resistant nonmetallic heating body combined heating technology, selects the most suitable heating mode under the heating temperature of different areas, realizes the heating and heating of large-flow air by combining stepped heating and dividing the areas, finally achieves the simulation requirement of the total temperature of the large-flow air under high Mach number, solves the problem that the current high Mach number wind tunnel is difficult to realize the heating of the large-flow air, and also solves the industrial environment requiring high-temperature oxidation air.
The invention has the advantages that:
(1) The high-temperature heating body adopts the zirconia composite material heating element, so that the problem that the existing single traditional heater can not heat high-flow air to high temperature in an oxidizing environment is solved.
(2) The zoned heating mode effectively utilizes the most effective zone in the mature heating technology, and has high efficiency and good energy-saving effect.
(3) The thought of starting the high-temperature heating of the rear end by utilizing the temperature of the low-temperature heating of the front end is utilized, the induction heating self-starting measures are provided redundantly, the high-temperature heater can be started under the condition that the temperature of the front end fails, and the starting operation is more reliable.
(4) The heating area and the heating temperature can be accurately controlled according to the requirement, and the heating temperature can be increased from below 1800K to above 2300K at present.
(5) The complex process and construction cost of heating by nitrogen and then mixing oxygen are avoided in a high-temperature area, and the safety risk brought by introducing oxygen is avoided, so that the method is safer and more reliable.
Drawings
FIG. 1 is a diagram of a combined heating system according to the present invention;
FIG. 2 is a high temperature zirconia monomer heating unit;
fig. 3 is a high temperature heating module.
Detailed Description
As shown in fig. 1, the system of the present invention comprises: the low-temperature heater 1, the medium-temperature heater 2, the high-temperature heater 3, the data acquisition unit 4, the computer control system 5, the low-temperature heating power supply 6, the medium-temperature heating power supply 7, the direct-current high-temperature heating power supply 8 and the high-frequency induction heating power supply 9. High temperature valves are arranged between the heaters in different temperature areas.
The low-temperature heater 1 and the medium-temperature heater 2 adopt the currently mature metal heater, the high-temperature heater 3 is a heater module 14 which is formed by a plurality of zirconia composite materials 10 and a high-temperature single heating unit 15 formed by an induction heater 12, and high-temperature valves are arranged among the low-temperature heater 1, the medium-temperature heater 2 and the high-temperature heater 3.
As shown in fig. 2 and 3, the high-temperature single body heating unit 15 is a tubular heating body with an inner part for sealing the iron metal 13, which is formed by zirconia composite materials 10, an induction heater 12 is arranged outside the heating body, the induction coil is cooled by water, two ends of the tubular heating body are connected with a direct current electrode 11, and the tubular heating body is connected with an external direct current heating power supply through a water cable.
A plurality of high temperature unit heating units 15 are installed inside the pipe having the refractory lining, arranged along the pipe axis, and the high frequency induction cable and the direct current heating cable are connected to an external power supply through flanges at both sides of the pipe.
Temperature measuring sensors are arranged along the axial direction of the wall surfaces of the low-temperature heater section and the medium-temperature heater section, and the measuring range of the temperature measuring sensors is selected according to different temperature ranges. The high-temperature heater section is axially provided with an infrared non-contact temperature measurement sensor. The temperature data obtained by the sensor measurement is transmitted to a computer control system.
The valves between the sections are all electric high-temperature valves, and are controlled by a computer control system to be opened and closed.
The power, size and specification of the low, medium and high temperature heaters are selected by calculation according to the flow rate and temperature of the heated air.
When the system is started, the computer control system firstly closes an electric valve between the upstream of the low-temperature heater 1 and the middle-temperature heater 2, then opens a low-temperature heater power supply 6, heats the low-temperature section, integrally increases the temperature in the pipeline to about 800K, opens an electric valve between the low-temperature heater 1 and the middle-temperature heater 2, closes the electric valve between the low-temperature section and the middle-temperature heater 2 after the temperature of the low-temperature section and the middle-temperature section are balanced, then opens the middle-temperature heater 2, slowly opens an electric valve at the downstream of the middle-temperature section after the temperature of the pipeline is integrally increased to 1000K-1200K, flows hot gas at the middle-temperature section into the high-temperature section, and increases the temperature of the high-temperature section, and starts a high-temperature section heating power supply 8 to supply power to the high-temperature monomer heating unit 15 after the temperature is balanced. If the heating body cannot be started due to low temperature, the induction heater 12 of the high-temperature heater 3 is started first, iron in the high-temperature single heating unit 15 is melted and reaches 1500 ℃, the induction heater is turned off, and then the direct-current heating power supply 8 for supplying power to the heating body is started. And simultaneously, sequentially opening the electric valve at the upstream of the low-temperature section, opening the electric valve between the low-temperature section and the middle-temperature section, injecting cold air flow with a certain flow rate from the upstream of the pipeline, keeping certain air flow in the pipeline, and preventing the downstream high-temperature region from reversely flowing to damage the upstream heater. Thereafter, the low temperature heater 1, the medium temperature heater 2 and the high temperature heater 3 are maintained in the simultaneously on state, and are gradually increased to the design power operation. After the heaters in each area stably run, the supply quantity of the upstream cold air flow is gradually increased until the working state, and the whole cold air flow is respectively subjected to a slow temperature rising process of combined heating of a low temperature section, a medium temperature section and a high temperature section, so that thermal shock to the pipeline and the heaters caused by overlarge temperature difference is avoided.
What is not described in detail in the present specification is common knowledge of a person skilled in the art.
Claims (1)
1. A combination induction heating system for heating a large flow of air, characterized by: the high-temperature heating system comprises a low-temperature heater, a medium-temperature heater, a high-temperature heater, a computer control system, a low-temperature heating power supply, a medium-temperature heating power supply, a direct-current high-temperature heating power supply and a high-frequency induction heating power supply, wherein the low-temperature heater, the medium-temperature heater and the high-temperature heater are sequentially arranged on an air pipeline and are provided with high-temperature valves, the computer control system respectively controls the low-temperature heater and the medium-temperature heater to work through the low-temperature heating power supply and the medium-temperature heating power supply, and controls the high-temperature heater to work through the direct-current high-temperature heating power supply and the high-frequency induction heating power supply, the high-temperature heater comprises a plurality of high-temperature single heating units, the high-temperature single heating units are tubular heating bodies which are formed by zirconia composite materials, iron metal is sealed inside, and induction heaters are arranged on the outer walls of the high-temperature single heating units;
the low-temperature heater and the medium-temperature heater are metal heaters;
the induction coil of the induction heater is cooled by water;
the high-temperature single heating units are arranged in the pipeline with the refractory lining, are arranged along the axis of the pipeline, and are respectively connected with an external high-frequency induction heating power supply and the external direct-current high-temperature heating power supply through flanges at two sides of the pipeline by means of high-frequency induction cables and direct-current heating cables;
the two ends of the tubular heating body are provided with direct current electrodes for connecting a direct current heating cable;
the high-temperature heater is a heater module which is formed by a zirconia composite material and a high-temperature monomer heating unit formed by an induction heater;
the induction coil is cooled by water and is connected with an external direct-current heating power supply through a water cable;
temperature measuring sensors are arranged along the axial direction of the wall surfaces of the low-temperature heater section and the medium-temperature heater section, the measuring range of each temperature measuring sensor is selected according to different temperature ranges, an infrared non-contact temperature measuring sensor is arranged along the axial direction of the high-temperature heater section, and temperature data obtained by measuring the sensors are transmitted to a computer control system;
the valves between the sections are all electric high-temperature valves, and are controlled by a computer control system to be opened and closed;
selecting proper power, size and specification of low-temperature, medium-temperature and high-temperature heaters through calculation according to the flow and temperature of heating air;
when the system is started, the computer control system firstly closes an electric valve between the upstream of the low-temperature heater and the medium-temperature heater, then opens a power supply of the low-temperature heater, heats the low-temperature section, integrally increases the temperature in the pipeline to 800K, opens the electric valve between the low-temperature heater and the medium-temperature heater, and closes the electric valve between the low-temperature section and the medium-temperature section after the temperature of the low-temperature section and the medium-temperature section are balanced; starting a medium-temperature heater to heat the medium-temperature section, starting an electric valve at the downstream of the medium-temperature section after the temperature in a pipeline of the medium-temperature section is integrally raised to 1000K-1200K, enabling hot gas at the medium-temperature section to flow into a high-temperature section and raise the temperature of the high-temperature section, and starting a high-temperature section heating power supply to supply power to a high-temperature monomer heating unit after the temperature is balanced; if the heating body cannot be started due to low temperature, firstly starting an induction heater of the high-temperature heater, melting iron in the high-temperature single heating unit, closing the induction heater after the iron reaches 1500 ℃, and then starting a direct-current heating power supply for supplying power to the heating body; simultaneously, sequentially opening an upstream electric valve of the low-temperature section, opening an electric valve between the low-temperature section and the middle-temperature section, injecting cold air flow with a certain flow rate from the upstream of the pipeline, keeping certain air flow in the pipeline, and preventing the downstream high-temperature region from reversely flowing to damage an upstream heater;
the low-temperature heater, the medium-temperature heater and the high-temperature heater are kept in the state of being simultaneously opened, the design power is gradually increased to run, after the heaters in all areas run stably, the supply quantity of the upstream cold air flow is gradually increased until the working state, and the whole cold air flow is respectively subjected to the slow temperature rising process of combined heating of the low-temperature section, the medium-temperature section and the high-temperature section so as to avoid thermal shock to the pipeline and the heaters caused by overlarge temperature difference.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011487973.4A CN112601308B (en) | 2020-12-16 | 2020-12-16 | Combined induction heating system for heating large-flow air |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011487973.4A CN112601308B (en) | 2020-12-16 | 2020-12-16 | Combined induction heating system for heating large-flow air |
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| CN112601308A CN112601308A (en) | 2021-04-02 |
| CN112601308B true CN112601308B (en) | 2023-05-12 |
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| DK2691757T3 (en) * | 2011-03-29 | 2017-05-22 | Florida Turbine Tech Inc | Device and method for testing an industrial gas turbine engine and its components |
| CN202792515U (en) * | 2012-07-04 | 2013-03-13 | 东莞市中镓半导体科技有限公司 | Device used for heating gas to high temperature quickly |
| CN104748371A (en) * | 2015-03-23 | 2015-07-01 | 西北工业大学 | Resistive heater used for engine combustion chamber experiment system |
| CN106091663B (en) * | 2016-06-02 | 2019-01-08 | 浙江大学 | A kind of heat pump accumulation of heat complementary type high temperature drying system and method |
| CN111412650B (en) * | 2020-04-02 | 2022-02-01 | 中国航空工业集团公司北京长城计量测试技术研究所 | Large-flow pure air heater |
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