Gas heating device

Abstract

The utility model provides a gas heating device which comprises an outer cylinder body and an inner cylinder body, the inner cylinder body is arranged in the outer cylinder body, the outer cylinder body is provided with a particle inlet, the periphery of the outer cylinder body is connected with an electric heating device, the bottom of the outer cylinder body is provided with a gas distribution plate, a gas distributor and a gas inlet, one end of the gas distributor penetrates into the inner cylinder, the other end of the gas distributor sequentially penetrates through the gas distribution plate and the outer cylinder, the gas distribution plate is flatly laid at the bottom of the outer cylinder, the gas distribution plate and the outer cylinder form a bottom cavity, the gas inlet is communicated with the bottom cavity, and the gas outlet is communicated with the gas outlet. Gas to be heated is introduced into the gas inlet and the gas distributor, the inner part of the inner cylinder body is a rising area, a circulating area is arranged between the inner cylinder body and the outer cylinder body, particles are heated by the electric heating device, and heat exchange is carried out on the particles and the gas to be heated in the circulating process, so that the gas is heated.

Description

Technical Field

[0001] The utility model relates to the technical field of gas heating, in particular to a gas heating device. Background Art

[0002] With the proposal of the dual carbon goals, more and more industries are beginning to consider using electricity to replace fossil fuels as a heating energy source. At present, the main methods of electric heating are resistance heating, electromagnetic, microwave, electrode heating and other methods. There are a large number of application scenarios for heating gas in industry. Due to the poor thermal and magnetic conductivity of gas, the heating efficiency is higher by resistance heating, electromagnetic or other electric heating methods. In addition, when the gas is directly heated by resistance or other methods, the surface temperature of the heating medium is high and the residence time is relatively long. For some gases that decompose or react at high temperatures (such as carbon deposition), the heating surface will produce more thermal resistance due to the coking of the gas, which reduces the heating efficiency and even causes damage to the equipment in severe cases. Utility Model Content

[0003] In view of this, the utility model aims to propose a gas heating device to solve the problem that when the gas is directly heated by means of resistance or the like in the prior art, the surface temperature of the heating medium is high and the residence time is relatively long. For some gases that decompose or react (such as carbon deposition) at high temperatures, the heating surface will produce more thermal resistance due to coking of the gas, thereby reducing the heating efficiency and even causing damage to the equipment in severe cases.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A gas heating device comprises an outer cylinder and an inner cylinder, wherein the inner cylinder is arranged inside the outer cylinder, the outer cylinder is provided with a particle inlet, the outer periphery of the outer cylinder is connected to an electric heating device, the bottom of the outer cylinder is provided with a gas distribution plate, a gas distributor, and a gas inlet, one end of the gas distributor penetrates into the inner cylinder, and the other end of the gas distributor passes through the gas distribution plate and the outer cylinder in sequence, the gas distribution plate is laid flat on the bottom of the outer cylinder, the gas distribution plate and the outer cylinder form a bottom cavity, the gas inlet is connected to the bottom cavity, the gas to be heated is introduced into the gas inlet and the gas distributor, the interior of the inner cylinder is an ascending zone, the inner cylinder and the outer cylinder are between a circulation zone, the particles circulate in the ascending zone and the circulation zone, the particles are heated by the electric heating device, and the particles undergo heat exchange with the gas to be heated during the circulation process, thereby achieving gas heating.

[0006] The device can achieve suspension of particles in gas. During the fluidization process, the gas and solid have a very high contact area and a high heat transfer coefficient. Therefore, the particles are heated by an electric heating device and the gas is heated in a fluidized manner using high-temperature particles as the heating medium, thereby avoiding carbon deposition caused by long residence time of some gases or excessively high local temperatures.

[0007] Furthermore, the minimum distance between the inner cylinder and the gas distribution plate is H1, and the distance between one end of the gas distributor close to the inner cylinder and the gas distribution plate is H2, wherein H2>H1.

[0008] This arrangement allows the gas to be heated to be heated directly in the inner cylinder, thereby improving the heating efficiency of the gas.

[0009] Furthermore, the outer cylinder includes a cylinder cover, an upper cylinder, a middle cylinder, and a lower cylinder from top to bottom, the diameter of the upper cylinder is D3, the diameter of the lower cylinder is D2, wherein D3>D2, the diameter of the middle cylinder gradually decreases from top to bottom, the particle inlet is arranged on the lower cylinder, and the electric heating device is connected to the outer periphery of the lower cylinder.

[0010] In this arrangement, when the particles are brought into the upper end of the outer cylinder by the gas, they can fall into the circulation area between the outer cylinder and the inner cylinder, be heated again by the electric heating device, and continue to participate in the heating of the gas to be heated.

[0011] Furthermore, the electric heating device is an electromagnetic or microwave generating device.

[0012] This arrangement enables heating of the particles so that the particles exchange heat with the gas.

[0013] Furthermore, the gas distributor includes a vertical pipe and a disc, the vertical pipe and the disc are connected, the vertical pipe is inserted into the gas distribution plate and extends into the inner cylinder, the disc has a cavity structure, and the cavity structure of the disc is connected to the cavity structure of the vertical pipe.

[0014] Furthermore, the disc body includes a connecting portion and a transverse tube, and the transverse tube is multiple, and the multiple transverse tubes are connected to the circumferential side of the connecting portion.

[0015] This arrangement allows more particles to enter the inner cylinder to participate in heating the gas, thereby improving the efficiency of gas heating.

[0016] Furthermore, the connecting portion is provided with a first through hole, the first through hole is located at the center of the connecting portion, and the transverse tube is provided with a plurality of second through holes.

[0017] This arrangement improves the uniformity of fluidization of particles in the inner cylinder, making the heating of the gas more uniform.

[0018] Furthermore, the gas distribution plate is provided with a third through hole, and the third through hole is located at the center of the gas distribution plate.

[0019] The function of the gas distribution plate in the utility model is to evenly distribute the gas in the B area, so that the particles in the area are evenly fluidized. At the same time, the average flow rate of the gas in the B area should be lower than that in the A area, so that a density difference is formed between the A area and the B area to promote the internal circulation of the particles.

[0020] Furthermore, the gas distribution plate is a porous plate or a distribution plate with a hood structure, preferably a distribution plate with a hood structure. This arrangement can prevent particles from falling into the cavity below the distribution plate.

[0021] Furthermore, it also includes a purification part, and the outer cylinder is connected to the purification part through a connecting pipe.

[0022] The purification section is used to separate gas and solid and further purify the gas.

[0023] Compared with the prior art, the gas heating device described in the utility model has the following advantages:

[0024] 1) First, the utility model adopts electricity as a heat source to heat the gas, which has the advantage of low carbon; secondly, compared with direct heating of the gas, the gas heating device in the utility model uses particles as an intermediate medium, which can realize the internal circulation of particles in the outer cylinder, and the electric heating device is connected to the outside of the outer cylinder. The electric heating device heats the particles in the circulation zone, which can make the particles in the circulation zone heated more fully, and the heated particles can enter the ascending zone to heat the gas. The gas heating device can make the particles densely fluidized, increase the heat exchange between gas and solid, and improve the uniformity of particle temperature, thereby making the gas heating more uniform; the gas to be heated and the hot particles exchange heat in a fluidized manner, making full use of the advantages of high heat transfer coefficient and large specific surface area, which can realize rapid and uniform heating of the gas, and avoid carbon deposition caused by long residence time of some gases or excessively high local temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the gas heating device of the utility model;

[0026] Figure 2 It is a structural schematic diagram of the fluidized state of particles in the gas heating device of the utility model;

[0027] Figure 3 for Figure 1 Enlarged view of part a;

[0028] Figure 4 It is a structural schematic diagram of the gas distributor of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the gas distribution plate of the utility model.

[0030] Description of reference numerals:

[0031] 1-outer cylinder, 11-upper cylinder, 12-middle cylinder, 13-lower cylinder, 14-cylinder cover, 15-bottom cavity, 2-inner cylinder, 3-gas distributor, 31-vertical tube, 32-disc, 321-connecting part, 3211-first through hole, 322-horizontal tube, 3221-second through hole, 4-gas distribution plate, 41-third through hole, 42-wind hood structure, 5-gas inlet, 6-electric heating device, 7-particle inlet, 8-connecting pipe, 9-purification part, 91-cyclone separator, 92-collecting bin, 10-gas outlet, A-rising zone, B-circulation zone, 100-particles. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the accompanying drawings. The directions or positional relationships indicated by "upper", "lower", "left", "right", "top", "bottom" and the like mentioned in the embodiments refer to the directions or positional relationships shown in the accompanying drawings.

[0033] like Figures 1 to 5 As shown, the utility model relates to a gas heating device, the core of which is a gas-solid fluidized bed, which specifically comprises an outer cylinder 1 and an inner cylinder 2, wherein the inner cylinder 2 is arranged in the outer cylinder 1, and a particle inlet 7 for particles 100 to enter is arranged on the outer cylinder 1, and an electric heating device 6 is arranged outside the outer cylinder 1, and a gas distribution plate 4, a gas distributor 3, and a gas inlet 5 are arranged at the bottom of the outer cylinder 1, one end of the gas distributor 3 penetrates into the inner cylinder 2, and the other end of the gas distributor 3 passes through the gas distribution plate 4 in sequence. , an outer cylinder 1, the gas distribution plate 4 is laid flat on the bottom of the outer cylinder 1, the gas distribution plate 4 and the outer cylinder 1 form a bottom cavity 15, the gas inlet 5 is connected with the bottom cavity 15, the gas to be heated is introduced into the gas inlet and the gas distributor, the interior of the inner cylinder 2 is an ascending zone A, the inner cylinder 2 and the outer cylinder 1 are between a circulation zone B, the particles circulate in the ascending zone A and the circulation zone B, the particles are heated by an electric heating device, the particles undergo heat exchange with the gas to be heated during the circulation process, thereby achieving gas heating.

[0034] The utility model arranges the electric heating device outside the outer cylinder so that the electric heating device only heats the particles in the circulation zone, thereby avoiding the phenomenon of insufficient heating of particles far from the heating source due to insufficient penetration depth of electromagnetic or microwave.

[0035] The device of the utility model increases heat exchange between particles and improves the uniformity of particle temperature through dense phase fluidization of particles.

[0036] Specifically, the inner cylinder can be fixed to the outer cylinder by a third connecting piece, so that the inner cylinder is more stable and reliable when the gas is heated.

[0037] Specifically, the bottom cavity 15 is not connected to the cavity of the gas distributor 3. This arrangement allows the gas to be heated to enter the ascending zone through the gas distributor, and the gas in the bottom cavity allows the particles to enter the ascending zone, thereby increasing the contact area between the particles and the gas to be heated and improving the heating efficiency of the gas to be heated.

[0038] Specifically, the particles used in the utility model are arranged correspondingly to the electric heating device, and the composition of the solid particles can be customized as needed so that they can absorb electromagnetic waves or microwaves, thereby being heated using electricity as an energy source. Preferably, the particles entering the particle inlet 7 are magnetically conductive materials such as iron or microwave-absorbing media such as Al2O3, and the electric heating device 6 is an electromagnetic or microwave generating device. The gas to be heated can be air or a combustible gas, such as refined coal gas, which is a gas that does not react with the particles used in the device at high temperatures.

[0039] Specifically, the minimum distance between the inner cylinder 2 and the gas distribution plate 4 is H1, and the distance between the end of the gas distributor 3 close to the inner cylinder 2 and the gas distribution plate 4 is H2, wherein H2>H1.

[0040] Specifically, the covering length of the electric heating device 6 on the outer cylinder 1 is L2, and the length of the inner cylinder is L1, wherein L2<L1, and the transverse axis of the electric heating device coincides with that of the inner cylinder.

[0041] As a preferred embodiment of the present application, the particle inlet 7 is located at the upper end of the electric heating device 6 , and the height of the particle inlet 7 is consistent with the height of the inner cylinder 2 .

[0042] This arrangement enables more particles to directly enter the circulation zone in the outer cylinder for heating. The heated particles enter the ascending zone, and the particles in the ascending zone exchange heat with the gas to be heated, thereby improving the heating efficiency of the gas to be heated.

[0043] Specifically, the outer cylinder 1 includes a cylinder cover 14, an upper cylinder 11, a middle cylinder 12, and a lower cylinder 13 from top to bottom. The diameter of the upper cylinder is D3, and the diameter of the lower cylinder is D2, wherein D3>D2. The diameter of the middle cylinder 12 gradually decreases from top to bottom, and the particle inlet and the electric heating device 6 are both arranged on the lower cylinder 13.

[0044] Specifically, the gas distributor is a multi-branch pipe structure, each pipe has multiple holes, and the gas is ejected from the holes, so that the gas to be heated is evenly distributed in the cross section of the inner cylinder. After the gas enters the inner cylinder, the apparent gas flow rate in the inner cylinder is greater than the gap between the outer cylinder and the inner cylinder, so that the average density in the inner cylinder is lower than the outside of the inner cylinder, and a density difference is formed between the inside and the outside, and the circulation between the inner and outer cylinders is achieved by the density difference. In addition, the amount of particles entering the inner cylinder is controlled by the size ratio of D1 and D2, the height of H2, and the gas flow rate of the inner and outer cylinders.

[0045] More specifically, the gas distributor 3 includes a vertical pipe 31 and a disc 32. The vertical pipe 31 and the disc 32 are connected. The vertical pipe 31 is inserted into the gas distribution plate 4 and extends into the inner cylinder 2. The disc has a cavity structure. The cavity structure of the disc 32 is connected to the cavity structure of the vertical pipe 31.

[0046] Specifically, the disk body 32 includes a connecting portion 321 and a transverse tube 322 . The transverse tubes are multiple and the multiple transverse tubes 322 are connected to the circumferential side of the connecting portion 321 . Preferably, the transverse tubes are 6.

[0047] More specifically, the connecting portion 321 is provided with a first through hole 3211, which is located at the center of the connecting portion, and the transverse tube is provided with a plurality of second through holes 3221. When the gas to be heated passes through the vertical tube 31, part of it flows out through the second through holes on the transverse tube, and part of it flows out through the first through holes. The gas flow rate of the first through hole is large, which can accelerate the circulation of particles and improve gas-solid heat exchange. The gas flow rate of the second through hole is small, so that more particles in the circulation area enter the rising area, thereby increasing the gas-solid exchange area and improving the heating efficiency of the gas.

[0048] Specifically, the gas distribution plate 4 is provided with a third through hole 41 , and the third through hole 41 is located at the center of the gas distribution plate. The third through hole is convenient for inserting a gas distributor.

[0049] Specifically, the gas distribution plate is a porous plate or a distribution plate with a hood structure, preferably a distribution plate with a hood structure. This arrangement can prevent particles from falling into the bottom cavity 15 below the distribution plate.

[0050] More specifically, the hood structures 42 are arranged in a circumferential manner on the gas distribution plate 4 .

[0051] Specifically, the diameter of the inner cylinder 2 is D1, and the minimum diameter of the circle formed by the hood structure is larger than the diameter D1 of the inner cylinder 2. This arrangement accelerates the fluidization of particles and improves the heating efficiency of the gas.

[0052] Specifically, the cylinder cover 14 is connected to the purification unit 9 via a connecting pipe 8 .

[0053] Specifically, the purification section 9 includes a cyclone separator 91 and a collecting bin 92. The collecting bin 92 is located at the bottom of the purification section 9. The collecting bin 92 is used to collect particles. The collected particles can be added to the particle inlet again to continue to participate in the heating of the gas, thereby improving the utilization rate of the particles. The cyclone separator 91 is used to separate gas and solids to further purify the heated gas.

[0054] More specifically, the purification part 9 is connected to an air outlet 10 , and the air outlet 10 is located at the upper end of the purification part 9 .

[0055] The gas heating device of the utility model uses particles as heat exchange carriers, converts electrical energy into thermal energy in the form of microwaves or electromagnetic waves, and then directly contacts the gas to be heated, utilizing the advantages of a large heat transfer coefficient and sufficient mixing of a fluidized bed to ensure rapid and uniform heating of the gas.

[0056] The gas heating device of the utility model is specifically used as follows:

[0057] In the preheating stage of the particles, it is preferred to add a certain mass of particles through the particle inlet. The particle loading amount should not exceed 1 / 2 of the straight section of the lower cylinder of the device. After the particles are added, the electric heating device is turned on, and inert gas (such as nitrogen) is filled into the gas inlet and gas distributor as a fluidizing medium. The inert gas flow rate is controlled to keep the gas flow rate at 0.2-0.5m / s when the particles circulate. At this time, the particles circulate internally between the outer cylinder and the inner cylinder, and the temperature continues to rise. When the temperature of the outer cylinder rises to about 100°C higher than the temperature of the gas to be heated, the preheating stage is completed.

[0058] The gas to be heated is heated, and the gas inlet and gas distributor both pass the gas to be heated. By controlling the amount of gas inlet entering, the flow rate of the gas out of the raised structure is 0.1-0.3m / s. The upper end of the raised structure forms a dense bed flow. The gas flow rate entering the gas distributor is controlled so that the flow rate of the gas to be heated in the inner cylinder is 1-2m / s. At this time, the bed density is low due to the high gas flow rate in the inner cylinder. A density difference is formed on both sides of the inner cylinder. The particles in the outer annular gap enter the inner cylinder under the drive of the static pressure difference, and quickly exchange heat with the gas to be heated inside the inner cylinder, and the temperature is reduced. After the particles taken away from the inner cylinder enter the upper part of the device, due to the increase in cross-sectional area and the decrease in flow rate, the particles fall to the circulation area under the action of gravity, and are heated at this position and enter the subsequent cycle. The heated gas enters the cyclone separator from the top, completes the gas-solid separation, and enters the downstream. In this process, since the gas will take away some particles, it is necessary to replenish particles from the gas heating device. The amount of particles replenished is related to the scale of the device.

[0059] In the whole gas heating device, the heights of D1 / D2, H1 and H2 are the key parameters of the equipment. When designing, the corresponding values ​​need to be adjusted according to the physical properties and heat exchange requirements. For example, if H1 is increased within a certain range, the particle circulation volume will increase, and the heat exchange intensity between the solid particles in the inner cylinder and the gas to be heated will increase. If other conditions of the equipment remain unchanged, the flow rate of the gas to be heated can be appropriately increased.

[0060] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A gas heating device, characterized in that: The invention comprises an outer cylinder (1) and an inner cylinder (2), wherein the inner cylinder (2) is arranged inside the outer cylinder (1), the outer cylinder (1) is provided with a particle inlet (7), the outer periphery of the outer cylinder (1) is connected with an electric heating device (6), the bottom of the outer cylinder (1) is provided with a gas distribution plate (4), a gas distributor (3), and a gas inlet (5), one end of the gas distributor (3) penetrates into the inner cylinder (2), the other end of the gas distributor (3) passes through the gas distribution plate (4) and the outer cylinder (1) in sequence, and the gas distribution plate (4) is laid flat on the outer cylinder (1). At the bottom, the gas distribution plate (4) and the outer cylinder (1) form a bottom cavity (15), the gas inlet (5) is connected to the bottom cavity (15), the gas inlet (5) and the gas distributor (3) are fed with the gas to be heated, the interior of the inner cylinder (2) is an ascending zone (A), and the space between the inner cylinder (2) and the outer cylinder (1) is a circulation zone (B), the particles circulate in the ascending zone (A) and the circulation zone (B), the particles are heated by the electric heating device (6), and the particles exchange heat with the gas to be heated during the circulation process, thereby achieving heating of the gas.

2. A gas heating device according to claim 1, characterized in that: The minimum distance between the inner cylinder (2) and the gas distribution plate (4) is H1, and the distance between the end of the gas distributor (3) close to the inner cylinder (2) and the gas distribution plate (4) is H2, wherein H2>H1.

3. A gas heating device according to claim 1, characterized in that: The outer cylinder (1) comprises, from top to bottom, a cylinder cover (14), an upper cylinder (11), a middle cylinder (12), and a lower cylinder (13); the diameter of the upper cylinder (11) is D3, the diameter of the lower cylinder (13) is D2, wherein D3>D2; the diameter of the middle cylinder (12) gradually decreases from top to bottom; the particle inlet (7) is arranged on the lower cylinder (13); and the electric heating device (6) is connected to the outer periphery of the lower cylinder (13).

4. A gas heating device according to claim 1, characterized in that: The electric heating device (6) is an electromagnetic or microwave generating device.

5. A gas heating device according to claim 1, characterized in that: The gas distributor (3) comprises a vertical pipe (31) and a disc (32); the vertical pipe (31) and the disc (32) are connected; the vertical pipe (31) is inserted into the gas distribution plate (4) and extends into the inner cylinder (2); the disc (32) has a cavity structure; the cavity structure of the disc (32) is connected to the cavity structure of the vertical pipe (31).

6. A gas heating device according to claim 5, characterized in that: The disk body (32) comprises a connecting portion (321) and a transverse tube (322). There are a plurality of transverse tubes (322), and the plurality of transverse tubes (322) are connected to the circumferential side of the connecting portion (321).

7. A gas heating device according to claim 6, characterized in that: The connecting portion (321) is provided with a first through hole (3211), the first through hole (3211) is located at the center of the connecting portion (321), and the transverse tube (322) is provided with a plurality of second through holes (3221).

8. A gas heating device according to claim 1, characterized in that: The gas distribution plate (4) is provided with a third through hole (41), and the third through hole (41) is located at the center of the gas distribution plate (4).

9. A gas heating device according to claim 1, characterized in that: The gas distribution plate (4) is a porous plate or a distribution plate with a hood structure (42).

10. A gas heating device according to claim 1, characterized in that: It also comprises a purification part (9), and the outer cylinder (1) is connected to the purification part (9) via a connecting pipe (8).

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