Gas-liquid mixing electric heating device and method

Abstract

The invention discloses a gas-liquid mixing electric heating device and method, and the device comprises a heating tank, a power supply control mechanism, a valve control mechanism and more than two electric heating pipes. A material inlet is formed in the bottom of the heating tank; an inner cavity of the heating tank is divided into a mixing area positioned at the lower part and a heating area positioned at the upper part; a gas-liquid mixing plate with a porous structure is arranged in the mixing area; the electric heating pipes are arranged in the heating area; the electric heating pipes are divided into a plurality of groups according to different lengths of the heating sections; the lower end positions of the heating sections are the same; a material outlet is formed in the side wall of the heating tank; the power supply control mechanism is used for controlling power supply of each electric heating pipe; the valve control mechanism is used for controlling the on-off of each valve; according to the invention, under different workloads, sufficient gas-liquid mixing and heating of materials can be realized, so that the replacement of a traditional coal-fired gas furnace heating method is realized.

Description

Technical Field

[0001] The invention relates to the field of mixed heating, and in particular to a gas-liquid mixed electric heating device and method. Background Art

[0002] In the fields of petroleum refining, chemical production, and crude oil mining and exploration, boilers are widely used to heat raw materials, many of which require gas-liquid two-phase mixing and heating.

[0003] Based on environmental protection needs, in order to reduce carbon emissions and reduce the generation of pollutants such as nitrogen oxides and sulfur oxides, coal usage indicators have been strictly controlled across the country. Therefore, it can be expected that the use of traditional coal-fired and gas-fired furnaces will be subject to increasingly stringent restrictions.

[0004] The inventors have found through research that the gas-liquid two-phase mixed heating method in the prior art still has at least the following defects:

[0005] During the electrification transformation of traditional gas-liquid mixed heating gas furnaces, simply using the immersion heating method to heat the gas-liquid mixture will result in uneven heating, and the gas and liquid phases will be too severely separated at the outlet, resulting in poor mixing effect; at the same time, the horizontal electric heating furnace is not segmented, and the material heating outlet will still have uneven mixing and heating after a long time; there is an urgent need for a heating device that uses clean energy as a heat source to be used in the scenario of gas-liquid two-phase mixing and heating.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The purpose of the present invention is to use clean energy as a heat source to replace coal-fired gas boilers for gas-liquid two-phase mixing and heating.

[0008] The present invention provides a gas-liquid mixed electric heating device, comprising: a heating tank, a power supply control mechanism, a valve control mechanism and more than two electric heating tubes;

[0009] The bottom of the heating tank is provided with a material inlet; the inner cavity of the heating tank is divided into a mixing zone located at the bottom and a heating zone located at the top;

[0010] The mixing zone is provided with a gas-liquid mixing plate; the gas-liquid mixing plate is a porous structure;

[0011] Each of the electric heating tubes is arranged in the heating zone; the electric heating tubes are divided into multiple groups according to the different lengths of the heating sections; each of the heating sections is arranged to have the same lower end position;

[0012] The side wall of the heating tank is provided with a material outlet; the number of the material outlets is the same as the number of groups of the electric heating tubes; each of the material outlets is respectively located to match the upper end position of each heating section and is provided with a valve;

[0013] The power supply control mechanism is used to control the power supply of each of the electric heating tubes; the valve control mechanism is used to control the on and off of each of the valves.

[0014] Preferably, in the embodiment of the present invention, it also includes:

[0015] A disc-shaped internal component is arranged in the heating zone; the internal component is provided with a sleeve for stabilizing the electric heating tube and guiding the mixture, and a mixing hole for mixing gas and liquid.

[0016] Preferably, in an embodiment of the present invention, the internal component includes a plurality of;

[0017] A plurality of the internal components are arranged in layers in the heating zone, and the mixing holes of adjacent layers are arranged so that their projection positions are inconsistent.

[0018] Preferably, in the embodiment of the present invention, it also includes: the main structure of the internal component is mesh-shaped.

[0019] Preferably, in an embodiment of the present invention, the gas-liquid mixing plate is made of ceramic material.

[0020] Preferably, in an embodiment of the present invention, the pore size of the pore structure located at the lower part of the gas-liquid mixing plate is larger than the pore size of the pore structure at the upper part of the gas-liquid mixing plate.

[0021] Preferably, in an embodiment of the present invention, the heating tank includes a plurality of heating tanks; each of the heating tanks is connected in series through a pipeline, including:

[0022] A plurality of material outlets of the upstream heating tank are combined into one pipeline and then connected to the material inlet of the downstream heating tank.

[0023] Preferably, in an embodiment of the present invention, the electric heating tube is configured to be U-shaped.

[0024] Preferably, in an embodiment of the present invention, the material inlet is further provided with a pressure pump.

[0025] In another aspect of the present invention, a gas-liquid mixed electric heating method is also provided, which is used for the gas-liquid mixed electric heating device as described above, comprising the steps of:

[0026] S11, calculating the corresponding power load according to the target temperature and target flow rate of the gas-liquid mixed product;

[0027] S12, determining a corresponding power supply strategy according to the power load; the power supply strategy includes determining the group and number of electric heating tubes involved in heating;

[0028] S13, determining the on-off combination of the valve according to the group of electric heating tubes involved in heating.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The heating tank in the present invention, on the one hand, uses a gas-liquid mixing plate to fully mix the gas and liquid in the material entering from the bottom of the tank, and on the other hand, is also provided with a plurality of groups of heating tubes with heating sections of different lengths; in this way, the corresponding heat load can be determined according to the different processing amounts of the material per unit time, and then the heating tubes with heating sections of different lengths can be controlled to participate in the heating of the material; the present invention can achieve sufficient gas-liquid mixing and heating of the material under different workloads, thereby replacing the traditional coal-fired gas furnace heating method and reducing carbon dioxide emissions; that is, the present invention replaces the coal-fired gas boiler with a gas-liquid mixing electric heating device, which is more environmentally friendly; and also improves the electrification rate, automation rate and intelligence of the equipment.

[0031] Furthermore, in the present invention, internal components can be provided in the heating tank, so that gas-liquid mixing can be performed again during the upward flow and heating process of the material, thereby further improving the stability of uniform heating of the gas-liquid mixture inside the heating tank, thereby improving the overall efficiency of the gas-liquid mixed heating.

[0032] Furthermore, in the present invention, multiple heating tanks can be heated in series according to flow requirements or operating load requirements. By mixing gas and liquid in each heating tank, multiple mixing of gas and liquid can be achieved in the entire process, thereby reducing gas-liquid stratification.

[0033] In addition, in the present invention, the power of the electric heating tube can be adjusted by the power control mechanism, so as to cope with continuously changing working conditions to ensure the temperature stability of the total outlet.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of the gas-liquid mixed electric heating device of the present invention;

[0037] Figure 2 It is a schematic diagram of the top view of the internal component of the present invention;

[0038] Figure 3 is a side structural schematic diagram of the internal component described in the present invention;

[0039] Figure 4 It is another structural schematic diagram of the gas-liquid mixed electric heating device of the present invention;

[0040] Figure 5 It is a step diagram of the gas-liquid mixed electric heating method described in the present invention. DETAILED DESCRIPTION

[0041] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0042] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0043] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0044] Embodiment 1

[0045] In order to uniformly heat the gas-liquid two-phase mixture, Figure 1 As shown, a gas-liquid mixed electric heating device is provided in an embodiment of the present invention, including: a heating tank 100, a power supply control mechanism 200, a valve control mechanism 300 and more than two electric heating tubes 03.

[0046] A material inlet 01 is provided at the bottom of the heating tank 100; the inner cavity of the heating tank 100 is divided into a mixing zone located at the lower part and a heating zone located at the upper part; a gas-liquid mixing plate 02 is provided in the mixing zone; the gas-liquid mixing plate 02 is a porous structure; each electric heating tube 03 is arranged in the heating zone; the electric heating tube 03 is divided into multiple groups according to the different lengths of the heating sections; each heating section is arranged to have the same lower end position; a material outlet 04 is provided on the side wall of the heating tank 100; the number of the material outlets 04 is the same as the number of groups into which the electric heating tube 03 is divided; each material outlet 04 is located to match the upper end position of each heating section and is provided with a valve 05.

[0047] The power supply control mechanism 200 is used to control the power supply of each electric heating tube 03 ; the valve control mechanism 300 is used to control the on and off of each valve 05 .

[0048] In the embodiment of the present invention, the gas-liquid mixture as the material first enters the mixing zone in the heating tank 100 from the material inlet 01 at the bottom of the heating tank 100. At this time, the gas phase and the liquid phase in the material are not evenly mixed. After passing through the gas-liquid mixing plate 02 with a porous structure, the gas phase and the liquid phase in the gas-liquid mixture will be broken up into micro bubbles and micro droplets by the porous structure in the gas-liquid mixing plate 02; that is to say, after the material passes through the gas-liquid mixing plate 02, a fully mixed gas-liquid mixture is formed. At this time, the gas-liquid mixture can maintain a relatively stable mixing state during the heating time period during the subsequent heating process, and the gas and liquid will not be stratified; then, the fully mixed gas-liquid mixture enters the heating zone with the electric heating tube 03, and is then heated by the electric heating tube 03.

[0049] The gas-liquid mixing plate 02 in the embodiment of the present invention is thick and has an overall micro-honeycomb shape. In practical applications, the material of the gas-liquid mixing plate 02 in the embodiment of the present invention is preferably a ceramic material; that is, the gas-liquid mixing plate 02 is a ceramic dense honeycomb shape.

[0050] Preferably, in order to further improve the effect of gas-liquid mixing, in the embodiment of the present invention, the porous structure in the gas-liquid mixing plate 02 is divided into two types: a relatively large pore structure and a microporous structure, wherein the relatively large pore structure refers to a pore structure whose pore size is visible to the naked eye, and the microporous structure has a pore size so small that it is invisible to the naked eye, and the invisible part is composed of micron-level tiny pores. Under this setting, the liquid material is broken up into small liquids after passing through the relatively large pore structure visible to the naked eye, and the gaseous material forms micro droplets after passing through the microporous structure invisible to the naked eye. After the material flows through the gas-liquid mixing plate 02, it will be fully mixed into a dense microbubble state.

[0051] The electric heating tube 03 in the embodiment of the present invention can be divided into multiple groups according to the different lengths of the heating sections, such as being divided into three groups of short heating sections, medium heating sections and long heating sections; in the embodiment of the present invention, the purpose of grouping the electric heating tube 04 is to adapt to different electrical load conditions, that is, in order to adapt to different workloads, when the amount of material heated per unit time is small, the liquid level in the heating tank 100 is low, and the group of electric heating tubes 03 with the short heating section can enter the working state; when the amount of material to be heated per unit time increases, the liquid level in the heating tank 100 will also increase. According to the increase in the electrical load, the electric heating tubes 03 in the corresponding groups of the medium heating section and the long heating section can be gradually added to the working state (that is, the electric heating tubes are powered to enter the heating state).

[0052] In the embodiment of the present invention, the side wall of the heating tank 100 is provided with a plurality of material outlets 04, which are respectively located to match the upper end of each heating section. Thus, the outlet valve to be opened can be determined according to the height of the heating section of the highest group of electric heating tubes 03 that enters the working state. For example, if only the group of electric heating tubes 03 with the short heating section participates in heating, then the valve of the lowest material outlet 04 is opened; if all three groups of electric heating tubes 03 participate in heating, then the valve of the highest material outlet 04 is opened. In this way, power supply regulation and valve regulation under working load are realized.

[0053] It can be seen from the above that the heating tank in the embodiment of the present invention, on the one hand, uses the gas-liquid mixing plate to fully mix the gas and liquid in the material entering from the bottom of the tank, and on the other hand, is also provided with a plurality of groups of heating tubes with heating sections of different lengths; in this way, the corresponding heat load can be determined according to the different processing quantities of the material per unit time, and then the heating tubes with different lengths of heating sections can be controlled to participate in the heating of the material; thereby, the traditional coal-fired gas furnace heating method is replaced, and carbon dioxide emissions are reduced; that is, the embodiment of the present invention replaces the coal-fired gas boiler with a gas-liquid mixing electric heating device, which is more environmentally friendly; and also improves the electrification rate, automation rate and intelligence of the equipment.

[0054] In the heating area of ​​the heating tank 100, the material will have a tendency to separate gas and liquid during its rising process, that is, the mixing degree of the material will gradually decrease; in order to keep the heated material in a sufficient gas-liquid mixing state, further, refer to Figure 2 and Figure 3 In the embodiment of the present invention, a disc-shaped internal component 06 may be provided in the heating zone; the internal component 06 is provided with a sleeve 61 for stabilizing the electric heating tube 03 and guiding the mixture, and a mixing hole 62 for mixing gas and liquid.

[0055] In the embodiment of the present invention, the aperture of the mixing hole 62 is much smaller than the aperture of the sleeve 61. When the material passes through the mixing hole 62 with a small aperture, the gas phase and the liquid phase thereof will be further mixed, thereby blocking the gas-liquid separation process. The sleeve 61 is sleeved on the electric heating tube 03, thereby reducing the shaking amplitude of the electric heating tube 03 and improving the stability of the electric heating tube 03. In the embodiment of the present invention, the aperture of the sleeve 61 can also be set to be slightly larger than the outer diameter of the electric heating tube 03. In this way, under stable conditions, more gaseous materials will pass through the annulus between the electric heating tube 03 and the sleeve 61. Since the resistance of the liquid at the mixing hole 62 is relatively small, more gaseous materials will pass through the annulus between the sleeve 61. In this way, on the one hand, local coking of the electric heating tube 03 can be avoided. On the other hand, the gas and liquid phases can be mixed again after passing through the internal component 06.

[0056] In practical applications, a heating tank 100 may include multiple internal components 06, and the multiple internal components 06 are layered in the heating tank 100, so that the material in the heating tank 100 can be subjected to multiple enhanced gas-liquid mixing, thereby better maintaining the full mixing of gas and liquid in the material.

[0057] Preferably, when multiple internal components 06 are arranged in layers in the heating tank 100, the mixing holes 62 of two upper and lower adjacent internal components 06 can be set to be not in the same projected position, that is, a mixing hole 62 of an internal component 06 will not be on the same vertical line with a mixing hole 62 of the internal component 06 above it; this can further improve the mixing effect of gas and liquid in the material by preventing the material from continuously passing through the mixing holes 62 of multiple layers of internal components 06 without obstruction.

[0058] In an embodiment of the present invention, the main structure of the inner component 06 can also be set to a mesh shape. The inner component 06 is not only provided with a sleeve for stabilizing the electric heating tube 03 and guiding the gas-liquid mixture, but also provided with a mixing hole for mixing gas and liquid; in an embodiment of the present invention, the aperture of the mixing hole 62 for mixing gas and liquid and the aperture of the mixing hole 61 are both larger than the tube diameter of the electric heating tube 03, so that the gas phase and the liquid phase can pass through more easily. In addition, each electric heating tube 03 is set to a U shape and passes through the channel of the mixing hole 61, so that the inner component 06 plays the role of fixing the heating tube.

[0059] Preferably, in an embodiment of the present invention, thermocouples may be provided at preset positions of the plurality of electric heating tubes 03 to perform temperature monitoring when the gas-liquid mixed electric heating device is in operation, so as to monitor the operating status of the equipment and improve the safety of the equipment.

[0060] Embodiment 2

[0061] Based on the first embodiment, Figure 4As shown, the embodiment of the present invention further constructs a gas-liquid hybrid electric heating device that can be suitable for large load workload, specifically including:

[0062] The heating tanks include multiple ones, and the heating tanks are connected in series through pipelines; the specific series connection method is: multiple material outlets of the upstream heating tank are combined into one pipeline and then connected to the material inlet of the downstream heating tank.

[0063] In practical applications, after the first heating tank heats the material in stages, the material will flow into the downstream heating tank through its material outlet for further heating. Since in the embodiment of the present invention, each independent heating tank only needs to be partially heated, the material processing capacity of a single heating tank can be effectively increased under its limited heat load capacity. In this way, under the coordinated operation of multiple heating tanks, the overall workload of the gas-liquid mixing electric heating device can be greatly improved. In the embodiment of the present invention, gas-liquid mixing can be performed in each heating tank, which realizes multiple mixing of gas and liquid in the entire process, thereby reducing the gas-liquid stratification phenomenon.

[0064] Embodiment 3

[0065] Corresponding to the above device embodiment, another aspect of the present invention embodiment further provides a gas-liquid mixed electric heating method, such as Figure 5 As shown, the steps include:

[0066] S11, calculating the corresponding power load according to the target temperature and target flow rate of the gas-liquid mixed product;

[0067] The gas-liquid mixed electric heating method in the embodiment of the present invention is applicable to the gas-liquid mixed electric heating device in the first embodiment or the second embodiment.

[0068] According to the actual working conditions of the gas-liquid hybrid electric heating device and the electric energy to heat energy conversion algorithm, the corresponding electric load can be calculated according to the volume of the heated material per unit time and the required target temperature.

[0069] S12, determining a corresponding power supply strategy according to the power load; the power supply strategy includes determining the group and number of electric heating tubes involved in heating;

[0070] After the electric load is determined, the electric heating tubes 03 that are involved in this work are determined based on the different thermal powers of each group of electric heating tubes 03.

[0071] S13, determining the on-off combination of the valve according to the group of electric heating tubes involved in heating.

[0072] After determining the groups and numbers of electric heating tubes involved in this operation according to the power supply strategy, the liquid level in the heating tank can be determined accordingly, and then it can be determined which valves need to be controlled to be open.

[0073] It should be noted that since the gas-liquid mixed electric heating method in the embodiment of the present invention is a specific use method of the gas-liquid mixed electric heating device in Example 1 or Example 2, the beneficial effects obtained are consistent with the beneficial effects of the gas-liquid mixed electric heating device in Example 1 or Example 2, and will not be repeated here.

[0074] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas-liquid mixed electric heating device, characterized in that: include: A heating tank, a power supply control mechanism, a valve control mechanism and two or more electric heating tubes; The bottom of the heating tank is provided with a material inlet; the inner cavity of the heating tank is divided into a mixing zone located at the bottom and a heating zone located at the top; The mixing zone is provided with a gas-liquid mixing plate; the gas-liquid mixing plate is a porous structure; Each of the electric heating tubes is arranged in the heating zone; the electric heating tubes are divided into multiple groups according to the different lengths of the heating sections; each of the heating sections is arranged to have the same lower end position; The side wall of the heating tank is provided with a material outlet; the number of the material outlets is the same as the number of groups of the electric heating tubes; each of the material outlets is respectively located to match the upper end position of each heating section and is provided with a valve; The power supply control mechanism is used to control the power supply of each of the electric heating tubes; the valve control mechanism is used to control the on and off of each of the valves.

2. The gas-liquid mixed electric heating device according to claim 1, characterized in that: Also includes: A disc-shaped internal component is arranged in the heating zone; the internal component is provided with a sleeve for stabilizing the electric heating tube and guiding the mixture, and a mixing hole for mixing gas and liquid.

3. The gas-liquid mixed electric heating device according to claim 2, characterized in that: The internal components include a plurality of; A plurality of the internal components are arranged in layers in the heating zone, and the mixing holes of adjacent layers are arranged so that their projection positions are inconsistent.

4. The gas-liquid mixed electric heating device according to claim 2, characterized in that: Also includes: The main structure of the inner component is mesh-shaped.

5. The gas-liquid mixed electric heating device according to claim 1, characterized in that: The gas-liquid mixing plate is made of ceramic material.

6. The gas-liquid mixed electric heating device according to claim 5, characterized in that: The pore size of the pore structure located at the lower part of the gas-liquid mixing plate is larger than the pore size of the pore structure at the upper part of the gas-liquid mixing plate.

7. The gas-liquid mixed electric heating device according to claim 1, characterized in that: The heating tank comprises a plurality of; The heating tanks are connected in series through pipelines, including: A plurality of material outlets of the upstream heating tank are combined into one pipeline and then connected to the material inlet of the downstream heating tank.

8. The gas-liquid mixed electric heating device according to claim 2, characterized in that: The electric heating tube is arranged in a U shape.

9. The gas-liquid mixed electric heating device according to any one of claims 1 to 8, characterized in that: The material inlet is also provided with a pressure pump.

10. A gas-liquid mixed electric heating method, used in the gas-liquid mixed electric heating device as claimed in any one of claims 1 to 9, characterized in that: Includes steps: S11, calculating the corresponding power load according to the target temperature and target flow rate of the gas-liquid mixed product; S12, determining a corresponding power supply strategy according to the power load; the power supply strategy includes determining the group and number of electric heating tubes involved in heating; S13, determining the on-off combination of the valve according to the group of electric heating tubes involved in heating.

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