CN109654729B

CN109654729B - Multi-section gas heating device

Info

Publication number: CN109654729B
Application number: CN201811538827.2A
Authority: CN
Inventors: 田江平; 崔泽川; 隆武强; 冯立岩; 崔靖晨; 付佳聪
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2020-09-29
Anticipated expiration: 2038-12-17
Also published as: CN109654729A

Abstract

A multi-section gas heating device belongs to the technical field of fuel spraying and combustion visual experiment devices. The device comprises two access covers at two ends and a plurality of middle covers in the middle, wherein the two access covers are fastened together through nuts and bolts, and a heating section is arranged between the access cover and the middle cover or between the two middle covers; the heating section comprises a flowing steel sleeve sleeved with a finned heating core and is fixed by a ceramic bushing A, a ceramic bushing B and a ceramic bushing C; the silicon carbide rod is sleeved in the rib heating core. The device can greatly reduce the time required in the gas heating process and realize rapid heating; the problems of uneven temperature and overhigh wall surface in the constant volume combustion bomb can be effectively avoided, and the service life of the equipment is prolonged; the silicon carbide rod is embedded in the fin heating core, the fins are used for heating air, and the silicon carbide rod is not in direct contact with heated gas, so that the heat exchange area is increased, and the service life of the silicon carbide rod is prolonged; the number of heating sections can be increased or decreased according to the needs.

Description

Multi-section gas heating device

Technical Field

The invention relates to a multi-section gas heating device, and belongs to the technical field of fuel spraying and combustion visual experimental devices.

Background

The ambient gas temperature is an important parameter in the research of fuel spraying and combustion processes, so that the temperature of gas in a constant volume combustion bomb needs to be regulated and controlled. The existing gas heating devices of the constant-volume combustion bomb are provided with the following types, and the heating mode and the characteristics are simply introduced as follows:

1) the electric heating type: many constant volume burning bullets adopt electric heating's mode, and this kind of heating methods lays the heating rod bottom the constant volume burning bullet, or at constant volume burning bullet inner disc cloth heating wire, and this kind of heating methods can lead to the constant volume burning bullet in the temperature distribute inhomogeneous, to the precision production interference of experiment, and the rate of heating and the power of this kind of heating methods are difficult for adjusting moreover.

2) The shell-containing wall surface heating type: a wall surface heating mode is adopted for a part of constant volume combustion bombs, and a heating belt is uniformly wound on the surface of the constant volume combustion bomb, so that the temperature distribution of gas in the gas bomb is more uniform. However, if the required high temperature in the constant volume bomb is reached, the heating mode can cause the wall temperature of the constant volume bomb to be too high, so that the requirement on the metal material of the constant volume bomb is very high, and the window glass of the constant volume bomb with the window can be damaged due to the too high wall temperature.

3) Gas combustion type: the gas combustion type heating device is to let combustible gas (such as hydrogen) into the constant volume burning bomb and burn in order to reach high temperature high pressure fast, and this kind of heating method needs to carry out accurate calculation and control, and the result after the burning also probably causes the interference to the experimental result, and the combustible gas's of some kinds combustion products can be attached to window glass surface in addition, causes the damage to window glass.

In conclusion, the electric heating mode is safe and quick, but has the problem of uneven heating; the wall surface heating mode can ensure that the temperature distribution in the bomb is more uniform, but has higher requirements on bomb-containing materials and certain potential safety hazards; gas combustion heating may interfere with experimental results and may cause damage to the window glass.

Disclosure of Invention

The invention aims to overcome the defects and provide a multi-stage gas heating device for rapidly heating gas led into a constant-volume combustion bomb, which can realize rapid heating of high-pressure gas.

The technical scheme adopted by the invention is as follows: a multi-section gas heating device comprises two access covers at two ends and a plurality of middle covers in the middle, wherein the two access covers are fastened together through nuts and bolts, and a heating section is arranged between the access cover and the middle cover or between the two middle covers; the heating section is a flowing steel sleeve sleeved with a finned heating core and is fixed by a ceramic bushing A, a ceramic bushing B and a ceramic bushing C; the silicon carbide rod is sleeved in the fin heating core; the upper end and the lower end of the flowing steel sleeve are respectively provided with a gas inlet and outlet short pipe, round holes are formed in the inlet and outlet cover, the middle cover and the ceramic bushing A, the gas inlet and outlet short pipes of the flowing steel sleeve are embedded in the round holes of the ceramic bushing A, and a gas passage is formed by the gas inlet and outlet short pipes of the flowing steel sleeve, the fin heating core and the round holes in the middle cover; and a square groove is formed in the side edge of the ceramic bushing B, a lead is laid in the groove, and the lead is connected with electrodes inserted into the access cover or the middle cover and the top end or the bottom end of the ceramic bushing C to supply power to the silicon carbide rod.

The rib type of the rib heating core can be a straight rib heating core or a spiral rib heating core.

The upper end and the lower end of the rib part of the straight rib heating core are respectively provided with an annular oblique notch; the gas inlet and outlet short pipe of the flowing steel sleeve, the annular inclined notches at the upper end and the lower end of the straight rib heating core and the circular hole on the middle cover form a gas passage.

The invention has the beneficial effects that: the heating section of the multi-section gas heating device comprises a flowing steel sleeve sleeved with a finned heating core and fixed by a ceramic bush A, a ceramic bush B and a ceramic bush C; a silicon carbide rod is sleeved in the rib heating core; the upper end and the lower end of the flowing steel sleeve are respectively provided with a gas inlet and outlet short pipe, round holes are formed in the inlet and outlet cover, the middle cover and the ceramic bushing A, the gas inlet and outlet short pipes of the flowing steel sleeve are embedded in the round holes of the ceramic bushing A, and the gas inlet and outlet short pipes of the flowing steel sleeve, the fin heating core and the round holes in the middle cover form a gas passage; the side edge of the ceramic bushing B is provided with a square groove, a lead is laid in the groove, and the lead is connected with electrodes inserted into the access cover or the middle cover and the top end or the bottom end of the ceramic bushing C to supply power to the silicon carbide rod. The device can greatly reduce the time required in the gas heating process and realize rapid heating; the problems of uneven temperature and overhigh wall surface in the constant volume combustion bomb can be effectively avoided, and the service life of the equipment is prolonged; the silicon carbide rod is embedded in the fin heating core, the fins are used for heating air, and the silicon carbide rod is not in direct contact with heated gas, so that the heat exchange area is increased, and the service life of the silicon carbide rod is prolonged; the number of heating sections can be increased or decreased according to the needs.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings

Fig. 1 is a schematic structural view of a multi-stage gas heating device.

FIG. 2 is a schematic view of the structure of the flowing steel casing.

Fig. 3 is a schematic structural view of the heating section.

Fig. 4 is an enlarged view taken at i in fig. 3.

Fig. 5 is a sectional view a-a in fig. 3.

Figure 6 is a schematic diagram of a straight finned heating core.

Fig. 7 is a sectional view taken along line B-B in fig. 6.

In the figure: 1. the device comprises an access cover, 2, an electrode, 3, an intermediate cover, 4, an A ceramic bushing, 5, a B ceramic bushing, 6, a C ceramic bushing, 7, a fin heating core, 8, a flowing steel bushing, 9, a silicon carbide rod, 10, a nut, 11, a bolt, 12 and a round hole.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

Fig. 1 shows a schematic structural view of a multi-stage gas heating device.

Fig. 2 shows a schematic view of the structure of the flowing steel jacket.

Fig. 3, 4 and 5 show schematic structural views of the heating section.

The multi-section gas heating device comprises two access covers 1 at two ends and a plurality of middle covers 3 in the middle, wherein the two access covers 1 are fastened together through nuts 10 and bolts 11, and a heating section is arranged between the access cover 1 and the middle cover 3 or between the two middle covers 3; the heating section is a flowing steel sleeve 8 sleeved with a finned heating core 7 and is fixed by an A ceramic bushing 4, a B ceramic bushing 5 and a C ceramic bushing 6; the silicon carbide rod 9 is sleeved in the fin heating core 7; the upper end and the lower end of the flowing steel sleeve 8 are respectively provided with a gas inlet and outlet short pipe, the inlet and outlet cover 1, the middle cover 3 and the A ceramic lining 4 are all provided with round holes 12, the gas inlet and outlet short pipe of the flowing steel sleeve 8 is embedded in the round hole 12 of the A ceramic lining 4, and the gas inlet and outlet short pipe of the flowing steel sleeve 8, the fin heating core 7 and the round hole 12 on the middle cover 3 form a gas passage; and a square groove is formed in the side edge of the ceramic bushing B5, a wire is laid in the groove, and the wire is connected with the electrode 2 inserted into the top end or the bottom end of the access cover 1 or the middle cover 3 and the top end or the bottom end of the ceramic bushing C6 and supplies power to the silicon carbide rod 9.

The rib type of the rib heating core 7 may be a straight rib heating core or a spiral rib heating core.

Fig. 6 and 7 show schematic structural views of the straight-fin heating core.

The upper end and the lower end of the rib part of the straight rib heating core are respectively provided with an annular oblique notch; the gas inlet and outlet short pipe of the flowing steel sleeve 8, the annular oblique notches at the upper end and the lower end of the fin heating core 7 and the round hole 12 on the middle cover 3 form a gas passage.

By adopting the technical scheme, when the heating device works, the electrode 2 is connected with a power supply to supply power to the silicon carbide rod 9, the silicon carbide rod 9 is a heating device, the silicon carbide rod is sleeved in the rib heating core, the silicon carbide rod is not directly contacted with heated gas, and the rib heating core is used for heating the gas; the gas is heated after passing through the gas passage of the apparatus.

The heating device can heat the gas to 1200K in about 0.4 second by utilizing five heating inner cores (adopting 48 straight fin heating cores), the pressure can reach more than 15MPa, and the number of the heating sections can be increased or reduced according to the requirements under other conditions.

Claims

1. A multi-section gas heating device comprises two access covers (1) which are fastened together by nuts (10) and bolts (11), and a plurality of middle covers (3) in the middle, wherein a heating section is arranged between the access cover (1) and the middle covers (3) or between the two middle covers (3); the method is characterized in that: the heating section is a flowing steel sleeve (8) sleeved with a finned heating core (7) and is fixed by an A ceramic bushing (4), a B ceramic bushing (5) and a C ceramic bushing (6); a silicon carbide rod (9) is sleeved in the rib heating core (7); the upper end and the lower end of the flowing steel sleeve (8) are respectively provided with a gas inlet and outlet short pipe, round holes (12) are formed in the inlet and outlet cover (1), the middle cover (3) and the ceramic bushing A (4), the gas inlet and outlet short pipes of the flowing steel sleeve (8) are embedded in the round holes (12) of the ceramic bushing A (4), and the gas inlet and outlet short pipes of the flowing steel sleeve (8) form a gas passage with the fin heating core (7) and the round holes (12) in the middle cover (3); the side of the ceramic bushing B (5) is provided with a square groove, a lead is laid in the groove, and the lead is connected with an electrode (2) inserted into the top end or the bottom end of the access cover (1) or the middle cover (3) and the ceramic bushing C (6) to supply power to the silicon carbide rod (9).

2. A multi-stage gas heating apparatus as recited in claim 1, further comprising: the rib type of the rib heating core (7) is a straight rib heating core or a spiral rib heating core.

3. A multi-stage gas heating apparatus according to claim 2, wherein: the upper end and the lower end of the rib part of the straight rib heating core are respectively provided with an annular oblique notch; the gas inlet and outlet short pipe of the flowing steel sleeve (8), the annular inclined notches at the upper end and the lower end of the fin heating core (7) and the round hole (12) on the middle cover (3) form a gas passage.