Electric heating vacuum fluidized bed desorption equipment

Abstract

The utility model provides electric heating vacuum fluidized bed desorption equipment which comprises a multi-stage fluidized bed, a vacuum device and a plurality of electric heating devices, and the multi-stage fluidized bed comprises at least one reaction layer which is detachably connected; each reaction layer comprises a fluidized bed module and at least one electric heating device, the fluidized bed module is used for accommodating an adsorbent adsorbed with carbon dioxide, and the electric heating device is used for heating the fluidized bed module to desorb the carbon dioxide in the adsorbent; and the vacuum device is communicated with the multi-stage fluidized bed and is used for adjusting the vacuum degree in each fluidized bed module and extracting carbon dioxide desorbed from each fluidized bed module. Through the modular, visual, multi-control and freely-assembled structural design, in cooperation with the stable heating condition of the electric heating equipment, fluidized bed desorption of carbon dioxide is achieved with high efficiency and low cost, experimental parameters of different adsorbent materials in the vacuum desorption process can be provided, and data support is provided for large-scale industrial application.

Description

Technical Field

[0001] The utility model relates to the field of carbon capture, in particular to an electrically heated vacuum fluidized bed desorption device. Background Art

[0002] Carbon capture, utilization and storage (CCUS) is one of the key technologies to reduce carbon emissions. Carbon capture refers to a series of technologies that use various technologies and methods to capture carbon dioxide from the atmosphere or industrial emissions to reduce greenhouse gas emissions and address climate change.

[0003] In carbon capture technology, the vacuum desorption process is a method for removing carbon dioxide that has been adsorbed on an adsorbent, which involves desorbing the carbon dioxide from the adsorbent so that the adsorbent can be used again to capture more carbon dioxide. The vacuum desorption process generally involves applying a vacuum to the adsorbent that has already adsorbed carbon dioxide, thereby reducing the pressure around the adsorbent, and then heating it to desorb the carbon dioxide from it and enter the gas phase for collection.

[0004] Existing vacuum desorption solutions often require the use of fixed vacuum desorption equipment, which is relatively fixed in shape, large in size, inflexible, and difficult to store and move. It is also inconvenient to transport the equipment during mass production. In addition, existing vacuum desorption equipment is generally not very accurate, making it difficult to control variables to seek the best industrial parameters, and unable to provide accurate data for large-scale industrial applications. Utility Model Content

[0005] Based on the problems existing in the prior art, the utility model provides an electrically heated vacuum fluidized bed desorption device. The specific scheme is as follows:

[0006] An electrically heated vacuum fluidized bed desorption device comprises a multi-stage fluidized bed, a vacuum device and a plurality of electric heating devices, wherein the multi-stage fluidized bed comprises at least one detachably connected reaction layer;

[0007] Each reaction layer includes a fluidized bed module and at least one electric heating device, wherein the fluidized bed module is used to accommodate an adsorbent adsorbed with carbon dioxide, and the electric heating device is used to heat the fluidized bed module to desorb carbon dioxide from the adsorbent;

[0008] The vacuum device is connected to the multi-stage fluidized bed and is used to adjust the vacuum degree in each fluidized bed module and extract the carbon dioxide desorbed from each fluidized bed module.

[0009] In some specific embodiments, the multi-stage fluidized bed further comprises a partition between the reaction layers, and the partition is detachably connected to the adjacent reaction layers;

[0010] The partition is provided with a heat insulation structure to reduce the temperature influence between the reaction layers.

[0011] In some specific embodiments, the fluidized bed module is provided with an air inlet and an air extraction port;

[0012] The air inlet is used to introduce a carrier gas, and the carrier gas is used to reduce the partial pressure of carbon dioxide and / or enhance the heat conduction effect;

[0013] The vacuum device is connected to each gas extraction port and is used to extract the gas in the fluidized bed module.

[0014] In some specific embodiments, the multi-stage fluidized bed further comprises a total gas outlet connected to each fluidized bed module and a total gas inlet connected to each fluidized bed module;

[0015] The vacuum device is respectively connected to the main gas outlet and each gas extraction port to extract the gas in each fluidized bed module;

[0016] The main gas inlet end is used to introduce the carrier gas into each fluidized bed module.

[0017] In some specific embodiments, the adsorbent is in powder form, and the fluidized bed module is further provided with a blowing device, which is used to blow air into the fluidized bed module to fluidize the adsorbent.

[0018] In some specific embodiments, the fluidized bed module is further provided with an observation window, and the observation window is used to observe the reaction inside the fluidized bed module.

[0019] In some specific embodiments, the vacuum device includes a vacuum pump, a filtering device, and a pipeline;

[0020] One end of the pipeline is connected to the air extraction port, and the other end is connected to the vacuum pump; the filtering device is located on the pipeline and is used to filter the gas entering the vacuum pump.

[0021] In some specific embodiments, the carrier gas includes water vapor, CO 2 or water vapor and CO 2 mixture.

[0022] In some specific embodiments, the outer surface of the fluidized bed module is covered with an electric heating layer, which is used to heat the outer shell of the fluidized bed module. The temperature of the heating layer is consistent with that of the electric heating rod to facilitate rapid heating of the material.

[0023] In some specific embodiments, the electric heating device includes an electric heating rod, a connecting piece and a temperature control component;

[0024] The connecting piece is connected to the electric heating rod and / or the temperature control assembly, and is used to detachably connect the electric heating device to the fluidized bed module;

[0025] A plurality of electric heating rods are arranged in parallel, and the temperature control component is connected to each of the electric heating rods.

[0026] Beneficial effects: The utility model provides an electric heating vacuum fluidized bed desorption device, which realizes the fluidized bed desorption of carbon dioxide with high efficiency and low cost through modular, visual, multi-control and freely assembled structural design, in conjunction with the stable heating conditions of the electric heating equipment, and has a reasonable structure and convenient operation. It is also easy to compare the desorption efficiency data of different material layer thicknesses, different heating temperatures, different vacuum degrees, and different heating rod intervals, and can provide experimental parameters of different adsorbent materials in the vacuum desorption process, providing data support for large-scale industrial applications.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the structure of the electric heating vacuum fluidized bed desorption equipment of the utility model;

[0030] Figure 2 It is a schematic diagram of a fluidized bed module of the utility model;

[0031] Figure 3 It is a structural schematic diagram of the electric heating rod of the utility model.

[0032] Figure numerals: 1-multi-stage fluidized bed; 2-electric heating device; 3-vacuum device; 4-reaction layer; 5-fluidized bed module; 6-total air inlet end; 7-total air outlet end; 8-partition; 9-blowing device; 10-observation window; 11-temperature measuring point; 21-temperature control component; 22-connecting piece; 23-electric heating rod; 31-vacuum pump; 32-filtering device; 33-control end; 34-pipeline; 41-feed port; 42-discharge port; 43-air inlet; 44-exhaust port. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Example 1

[0035] This embodiment proposes an electrically heated vacuum fluidized bed desorption device, which completes the separation of solid amine and carbon dioxide through the modular design of the vacuum desorption device and the stable heating conditions of the electric heating device. The structural diagram of the electrically heated vacuum fluidized bed desorption device is shown in the attached manual. Figure 1 The specific plan is as follows:

[0036] An electrically heated vacuum fluidized bed desorption device includes a multi-stage fluidized bed 1, a vacuum device 3 and a plurality of electric heating devices 2. The multi-stage fluidized bed 1 includes at least one reaction layer 4, which is detachably connected to the multi-stage fluidized bed 1 through a connection structure; each reaction layer 4 includes a fluidized bed module 5 and at least one electric heating device 2, the fluidized bed module 5 is used to accommodate an adsorbent adsorbed with carbon dioxide, and the electric heating device 2 is used to heat the fluidized bed module 5 to desorb carbon dioxide from the adsorbent; the vacuum device 3 is connected to the multi-stage fluidized bed 1, and is used to adjust the vacuum degree in each fluidized bed module 5 and extract the carbon dioxide desorbed from each fluidized bed module 5. The specific structure is as shown in the attached figure. Figure 1 shown.

[0037] The present application heats the adsorbent in the fluidized bed module 5 through the electric heating device 2. The heating effect is stable, and the heating parameters are controllable, and the desorption temperature can be accurately reached. The number of electric heating devices 2 can be integrated in the reaction layer 4 according to the heat transfer needs, and each fluidized bed module 5 is heated by one or more electrolytic heat modules. Among them, the adsorbent is a powder or small particle material, which can be fluidized and desorbed in the gap of the electric heating device 2, effectively improving the desorption efficiency. The adsorbent can be selected from solid amines, which can be used to adsorb carbon dioxide. The desorption equipment of the present application uses high vacuum and low temperature to maintain the stability of the solid amine material, and will not destroy the performance of the solid amine material. The solid amine that desorbs carbon dioxide can re-adsorb carbon dioxide, realizing the recycling of solid amine materials, reducing the loss of solid amines, and reducing the cost of using solid amines.

[0038] The multi-stage fluidized bed 1 in the present application comprises a plurality of independent fluidized bed modules 5, and the plurality of fluidized bed modules 5 can simultaneously carry out fluidized bed desorption experiments of adsorbents under different conditions. The fluidized bed modules 5 are detachably connected to the multi-stage fluidized bed 1 through a connecting structure, and can be freely combined as needed. The connecting structure is such as a snap-fit ​​piece, etc. Different fluidized bed modules 5 can be used separately, or combined into a fluidized bed of a specific height. Through the design of the multi-stage module, the optimal material layer height, fluidizing air volume, expansion height, etc. can be experimented.

[0039] In the attached Figure 1 In the embodiment, the multi-stage fluidized bed 1 is composed of two fluidized bed modules 5, two electric heating modules, a partition 8, a total air inlet 6, and a total air outlet 7. The fluidized bed module 5 is composed of an air inlet 43, an air extraction port 44, a feed port 41, a feed port 42, an air distribution plate, an observation window 10, a temperature measuring point 11, and a fluidized bed shell wrapped on the outermost side. The specific structure of the fluidized bed module 5 is shown in the attached figure. Figure 2 shown.

[0040] In some specific embodiments, the multi-stage fluidized bed 1 includes a partition 8 located between the reaction layers 4, and the partition 8 is detachably connected to the adjacent reaction layers 4; a heat-insulating structure is configured in the partition 8 to reduce the temperature influence between the reaction layers 4. The reaction layers 4 are separated by the partition 8, and the partition 8 can be filled with a heat-insulating material to form a heat-insulating structure. The heat-insulating material in the partition 8 is asbestos, glass fiber or polyurethane foam, etc., which can effectively isolate heat and reduce the temperature influence between multiple fluidized bed modules 5. At the same time, the dimensions of the connection of each fluidized bed module 5 are the same. After removing the partition 8, a fluidized bed of a specific height can be freely formed. When not in use, it can be disassembled and stacked, and it will not be impossible to store and move the equipment because it is too high. It is also convenient to transport the equipment during mass production.

[0041] The fluidized bed module 5 is used as a carrier device for desorption and needs to be sealed. It may include an air inlet 43, an air exhaust port 44, a feed port 41, a discharge port 42, a blowing device 9, an observation window 10, a temperature measuring point 11, a shell, etc. The air inlet 43 can be used to introduce carrier gas, the air exhaust port 44 can be responsible for extracting the gas inside the fluidized bed module 5, and the feed port 41 and the discharge port 42 are responsible for transmitting the adsorbent. The blowing device 9 can make the adsorbent enter a fluidized state from a solid powder to ensure sufficient desorption. The observation window 10 can be used to observe the reaction conditions inside each fluidized bed module 5. The temperature measuring point 11 is used to detect the temperature inside the fluidized bed module 5. Carbon dioxide desorption requires precise temperature conditions. Setting the temperature measuring point 11 at a specific position can accurately know the temperature conditions inside the module. The position of the temperature measuring point is shown in the attached Figure 2 shown.

[0042] During the desorption of carbon dioxide, a carrier gas may be introduced appropriately to improve the heating efficiency. In some specific embodiments, the fluidized bed module 5 is provided with an air inlet 43 and an air extraction port 44; the air inlet 43 is used to introduce a carrier gas, which is used to reduce the partial pressure of carbon dioxide and / or enhance the thermal conductivity; the vacuum device 3 is connected to each air extraction port 44 to extract the gas in the fluidized bed module 5. Each air extraction port 44 is equipped with a filter element to prevent the adsorbent powder from being extracted by the vacuum pump 31. In some specific embodiments, the carrier gas is water vapor, CO 2 , or water vapor and CO 2 The carrier gas needs to be preheated to a temperature above the desorption temperature to prevent the water vapor from liquefying when contacting the material. When the carrier gas is introduced, the adsorbent material is heated faster, the material temperature field is more uniform, and the carbon dioxide is continuously desorbed during the bubbling fluidization process by the blowing device 9. When there is no need to introduce the carrier gas, the air inlet 43 is closed, and the adsorbent material can also reach the bubbling fluidization state driven by the desorbed carbon dioxide gas.

[0043] In some specific embodiments, the multi-stage fluidized bed 1 further includes a total gas outlet 7 connected to each fluidized bed module 5 and a total gas inlet 6 connected to each fluidized bed module 5; the vacuum device 3 is respectively connected to the total gas outlet 7 and each gas extraction port 44 to extract the gas in each fluidized bed module 5; the carrier gas enters each fluidized bed module 5 from the total gas inlet 6. When there is no partition 8, the total gas inlet 6 and the total gas outlet 7 can be set inside the multi-stage fluidized bed 1 to uniformly circulate the gas. When there is a partition 8, the vacuum device 3 can be connected to the gas extraction port 44 of each fluidized bed module 5 to independently control the reaction of each fluidized bed module 5.

[0044] In some specific embodiments, the fluidized bed module 5 is further provided with a blowing device 9, which is used to blow air to the fluidized bed module 5 to fluidize the adsorbent. The adsorbent is a powder or small particle material, which can enter a fluidized state when blown. In the fluidized state, the adsorbent can fully desorb carbon dioxide. Preferably, the blowing device 9 is equipped with an air distribution plate, and an air distribution plate is arranged at the bottom of each fluidized bed module 5 to blow the adsorbent from bottom to top. The structure of the blowing device 9 is shown in the attached figure. Figure 2 shown.

[0045] In some specific embodiments, the fluidized bed module 5 is provided with an observation window 10, which is used to observe the reaction inside the fluidized bed module 5. Figure 2 The observation window 10 is a quartz or tempered glass disc embedded in the outer shell of the fluidized bed module 5, which can observe the fluidization state of the adsorbent material during vacuum fluidization desorption. When no carrier gas is introduced, the progress of the desorption reaction can be preliminarily judged by observing the outgassing state of carbon dioxide.

[0046] In some specific embodiments, the vacuum device 3 includes a vacuum pump 31, a filter device 32 and a pipeline 34; one end of the pipeline 34 is connected to the air extraction port 44, and the other end is connected to the vacuum pump 31. The filter device 32 is connected to the pipeline 34 and is located between the air extraction port 44 and the vacuum pump 31, and is used to filter the gas entering the vacuum pump 31. The vacuum device 3 is also provided with a control terminal 33, which is connected to the vacuum pump 31 and is used to control the operation of the vacuum pump 31. The power can be adjusted to change the air extraction amount and reduce energy consumption. The structure of the vacuum device 3 is shown in the attached figure. Figure 1 As shown. The vacuum pump 31 is connected to the exhaust port 44 of the multi-stage fluidized bed 1 through a pipeline 34. A valve can be set in the pipeline 34 to realize vacuuming of a single fluidized bed module 5, and vacuuming of the fluidized bed assembled with multiple fluidized bed modules 5 as a whole. The vacuum degree of different fluidized bed modules 5 can also be controlled by controlling the valve opening in the pipeline 34. A filter device 32 is provided in front of the vacuum pump 31 to prevent fine adsorbent powder from entering the vacuum pump 31.

[0047] In some specific embodiments, an electric heating layer is provided in the outer shell of the fluidized bed module 5, and the electric heating layer is used to heat the shell of the fluidized bed module 5. The electric heating layer and the electric heating module can share a circuit control.

[0048] In some specific embodiments, the electric heating device 2 includes an electric heating rod 23, a connector 22 and a temperature control assembly 21; the connector 22 connects the electric heating rod 23 and / or the temperature control assembly 21, and is used to detachably connect the electric heating device 2 to the fluidized bed module 5; a plurality of electric heating rods 23 are arranged in parallel, and the temperature control assembly 21 connects each of the electric heating rods 23. The shape of the electric heating rod 23 is shown in the attached figure. Figure 3 As shown, the arrangement can be set according to the shape of the fluidized bed module 5. The connector 22 can be connected to the connecting structure, and the detachable connection between the connector 22 and the connecting structure enables the electric heating device 2 to be detachably connected to the fluidized bed module 5. When the fluidized bed module 5 is a rectangular fluidized bed, the electric heating rods 23 are also arranged in a rectangular shape, which can ensure that the fluidized bed module 5 has no large dead corners during heating, and most of the area can be heated. The electric heating rods 23 can be freely loaded and unloaded to control different heat transfer areas and heat transfer distances. Each electric heating rod 23 can be equipped with a separate control switch to facilitate experiments to find out the optimal relationship between the number of electric heating rods 23 and temperature, power, desorption efficiency, energy consumption, etc.

[0049] When the adsorbent desorbs carbon dioxide in the fluidized bed module 5, a certain amount of adsorbent is first added from the feed port 41, and then the feed port 41 is closed. A certain number of electric heating rods 23 are selected according to the experimental requirements. A single electric heating device 2 can also select different numbers of electric heating rods 23 to set the required desorption temperature and vacuum degree. According to the experimental requirements, choose whether to pass water vapor or carbon dioxide or other carrier gas from the air inlet 43. If not, close the air inlet 43, and then evacuate the fluidized bed for adsorbent desorption. After desorption is completed, the adsorbent can be discharged from the discharge port 42. When the height of the fluidized bed needs to be increased, the partition 8 in the multi-stage fluidized bed 1 and the air distribution plate in the fluidized bed module 5 are removed to obtain a fluidized bed of a specific height. When the vacuum device 3 is not started, the carrier gas volume is increased to obtain different relationships between fluidization wind speeds, heating stages, desorption temperatures, and desorption efficiencies. During vacuum desorption, a certain amount of adsorbent is still added from the feed port 41, the feed port 41 is closed, the required number of electric heating modules is selected, and the desorption temperature and vacuum degree are determined. If carrier gas is needed, the carrier gas is introduced from the total air inlet end 6. If not needed, the total air inlet end 6 is closed, and then the total air outlet end 7 is evacuated to perform fluidized desorption of the adsorbent. When the carrier gas is introduced, the amount of carrier gas is very small, and the amount of carrier gas is less than half of the amount of carbon dioxide desorbed. A certain vacuum degree can still be maintained inside the fluidized bed module 5. After desorption, the adsorbent material can be discharged from the discharge port 42. When there is too much material and it is difficult to discharge, the material can be sucked out by negative pressure conveying.

[0050] In some specific embodiments, the adsorbent may be a solid amine powder of a certain particle size, the desorption temperature may be 60 to 150° C., and the vacuum degree may be -0.50 to -0.99 bar. By using the equipment of the present application, different material layer thicknesses, different ratios of material amounts to heat transfer areas, and different ratios of carrier gas amounts to material amounts and other conditions may be controlled. By conducting experiments in parallel with multiple fluidized bed modules 5, a large amount of experimental data may be obtained, and then the most suitable processing parameters for industrial production may be obtained.

[0051] The utility model provides an electric heating vacuum fluidized bed desorption device, which realizes the fluidized bed desorption of carbon dioxide with high efficiency and low cost through modular, visual, multi-control and freely assembled structural design, in conjunction with the stable heating conditions of the electric heating device, and has a reasonable structure and convenient operation. It is also easy to compare the desorption efficiency data of different material layer thicknesses, different heating temperatures, different vacuum degrees, and different heating rod intervals, and can provide experimental parameters of different adsorbent materials in the vacuum desorption process, providing data support for large-scale industrial applications.

[0052] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0053] The above disclosure only discloses several specific implementation scenarios of the present invention. However, the present invention is not limited thereto, and any changes that can be conceived by technicians in this field should fall within the protection scope of the present invention.

Claims

1. An electrically heated vacuum fluidized bed desorption device, characterized in that: It comprises a multi-stage fluidized bed, a vacuum device and a plurality of electric heating devices, wherein the multi-stage fluidized bed comprises at least one detachably connected reaction layer; Each reaction layer includes a fluidized bed module and at least one electric heating device, wherein the fluidized bed module is used to accommodate an adsorbent adsorbed with carbon dioxide, and the electric heating device is used to heat the fluidized bed module to desorb carbon dioxide from the adsorbent; The vacuum device is connected to the multi-stage fluidized bed and is used to adjust the vacuum degree in each fluidized bed module and extract the carbon dioxide desorbed from each fluidized bed module.

2. The electrically heated vacuum fluidized bed desorption equipment according to claim 1, characterized in that: The multi-stage fluidized bed further comprises a partition plate located between the reaction layers, wherein the partition plate is detachably connected to the adjacent reaction layers; The partition is provided with a heat insulation structure to reduce the temperature influence between the reaction layers.

3. The electrically heated vacuum fluidized bed desorption equipment according to claim 1, characterized in that: The fluidized bed module is provided with an air inlet and an air extraction port; The air inlet is used to introduce a carrier gas, and the carrier gas is used to reduce the partial pressure of carbon dioxide and / or enhance the heat conduction effect; The vacuum device is connected to each gas extraction port and is used to extract the gas in the fluidized bed module.

4. The electrically heated vacuum fluidized bed desorption equipment according to claim 3, characterized in that: The multi-stage fluidized bed further comprises a total gas outlet connected to each fluidized bed module and a total gas inlet connected to each fluidized bed module; The vacuum device is respectively connected to the main gas outlet and each gas extraction port to extract the gas in each fluidized bed module; The main gas inlet end is used to introduce the carrier gas into each fluidized bed module.

5. The electrically heated vacuum fluidized bed desorption equipment according to claim 1, characterized in that: The adsorbent is in powder form, and a blowing device is further provided in the fluidized bed module, wherein the blowing device is used to blow air toward the fluidized bed module so that the adsorbent enters a fluidized state.

6. The electrically heated vacuum fluidized bed desorption equipment according to claim 1, characterized in that: The fluidized bed module is also provided with an observation window, and the observation window is used to observe the reaction inside the fluidized bed module.

7. The electrically heated vacuum fluidized bed desorption equipment according to claim 3, characterized in that: The vacuum device comprises a vacuum pump, a filtering device and a pipeline; One end of the pipeline is connected to the air extraction port, and the other end is connected to the vacuum pump; the filtering device is located on the pipeline and is used to filter the gas entering the vacuum pump.

8. The electrically heated vacuum fluidized bed desorption equipment according to claim 3, characterized in that: The carrier gas includes water vapor, CO2 or a mixture of water vapor and CO2.

9. The electrically heated vacuum fluidized bed desorption equipment according to claim 1, characterized in that: The outer surface of the fluidized bed module is covered with an electric heating layer, and the electric heating layer is used to heat the outer shell of the fluidized bed module.

10. The electrically heated vacuum fluidized bed desorption equipment according to claim 1, characterized in that: The electric heating device comprises an electric heating rod, a connecting piece and a temperature control component; The connecting piece is connected to the electric heating rod and / or the temperature control assembly, and is used to detachably connect the electric heating device to the fluidized bed module; A plurality of electric heating rods are arranged in parallel, and the temperature control component is connected to each of the electric heating rods.

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