Gas adsorption drying system based on staggered power consumption

Abstract

The application relates to a gas adsorption drying system based on staggered power utilization. The gas adsorption drying system based on staggered power utilization comprises a first adsorption system, a second adsorption system, a third adsorption system and a regeneration system. The first adsorption system, the second adsorption system and the third adsorption system are sequentially used to adsorb and dry process materials, and the single operation period of the first adsorption system, the second adsorption system and the third adsorption system is greater than or equal to 4 hours, so that at least two adsorption systems can be regenerated at night. The first adsorption system, the second adsorption system and the third adsorption system are regenerated by the regeneration system. The gas adsorption drying system based on staggered power utilization has the advantages of greatly reducing regeneration cost.

Description

Technical Field

[0001] This application relates to the field of energy-saving and environmental protection technology, and in particular to a gas adsorption drying system based on off-peak electricity consumption. Background Technology

[0002] An adsorption tower is a device that uses a solid adsorbent to selectively adsorb specific components in a fluid to achieve the separation, purification, or recovery of target substances. It is widely used in chemical, environmental protection, pharmaceutical, and food industries. Its core working principle is based on the intermolecular forces between the adsorbent and the components to be separated in the fluid, such as van der Waals forces, hydrogen bonds, or chemisorption. This causes the target component to be adsorbed onto the surface of the adsorbent, while other components pass through the tower with the fluid, thus achieving separation and purification.

[0003] Adsorption towers typically consist of a cylindrical or square tower body filled with granular, honeycomb, or fibrous adsorbents, such as activated carbon, molecular sieves, silica gel, and activated alumina. These adsorbents need to possess a large specific surface area and good adsorption performance. To ensure adsorption efficiency, the tower is often designed with a reasonable gas or liquid distribution device to ensure uniform fluid contact with the adsorbent and avoid channeling or short-circuiting. Simultaneously, most adsorption towers are equipped with a regeneration system. When the adsorbent reaches saturation, the adsorbed components can be desorbed through heating, depressurization, purging, or displacement, restoring the adsorbent's adsorption capacity and enabling recycling. This process reduces operating costs and improves the continuity and economy of the equipment.

[0004] Depending on the application, adsorption towers can be divided into gas adsorption towers and liquid adsorption towers, and their operation modes can be batch, semi-continuous, or continuous. For example, in waste gas treatment, adsorption towers can remove volatile organic compounds such as VOCs or odorous gases; in water treatment, they can adsorb pollutants such as heavy metal ions and organic matter; in chemical production, they can be used for solvent recovery, gas purification, and other processes. Adsorption towers are characterized by simple operation, high separation efficiency, and strong adaptability. Their design requires comprehensive consideration of parameters such as adsorbent type, fluid flow rate, temperature, and pressure to optimize adsorption effect and operational stability. They are one of the key pieces of equipment for achieving substance separation and purification in industrial production.

[0005] Adsorption tower regeneration is a crucial step in the adsorption process to restore the adsorption capacity of the adsorbent. Its core principle is to desorb the pollutants or target substances adsorbed by the adsorbent using specific methods, returning the adsorbent to its initial or near-initial active state for reuse. During adsorption, adsorbents such as activated carbon, molecular sieves, and ion exchange resins adsorb specific components from the fluid through their surface pore structure or chemical forces. When adsorption reaches saturation, the adsorption efficiency drops significantly, at which point a regeneration process needs to be initiated.

[0006] Energy consumption during the regeneration process is a crucial factor in the economic and environmental considerations of adsorption technology. Thermal regeneration and steam regeneration are typical methods with high energy consumption. Thermal regeneration requires a significant amount of energy to heat the adsorbent and maintain the desorption temperature. This is especially true for high-boiling-point pollutants or systems with strong adsorption forces, which often require higher regeneration temperatures. For example, the thermal regeneration temperature of activated carbon is typically 300-800℃. Heat loss during heating, energy consumption for heat preservation, and subsequent energy consumption for cooling the adsorbent further increase the total energy consumption.

[0007] In existing technologies, the regeneration process often occurs during the day, or even during peak electricity consumption periods, leading to high electricity prices. When the regeneration process coincides with a period of high electricity prices, it directly increases the operating costs of the process. Electricity-driven stages in adsorption tower regeneration will experience significantly increased energy costs due to rising electricity prices, especially for regeneration processes requiring prolonged high-temperature heating or high-power equipment operation. This cost increase may be even more pronounced, squeezing profit margins and potentially discouraging the adoption of adsorption technology by some low-value-added industries. Secondly, high electricity prices may force companies to adjust their regeneration plans, such as delaying the regeneration process to avoid peak electricity prices. However, this could lead to oversaturation of the adsorbent, reducing adsorption efficiency, increasing the risk of pollutant leakage, or requiring additional adsorbent reserves to cope with regeneration delays, thus increasing equipment idle costs and inventory pressure. Furthermore, if companies forcibly reduce regeneration power or shorten regeneration time during periods of high electricity prices to control costs, it may result in incomplete regeneration, with the adsorbent's activity not fully recovered. This not only shortens its lifespan and increases replacement frequency but also affects subsequent treatment results due to decreased adsorption efficiency, creating a vicious cycle of "cost control - decreased regeneration quality - deterioration of system performance." Meanwhile, for enterprises that rely on grid power and lack their own energy, the high electricity price of renewable energy consumption may exacerbate their sensitivity to energy price fluctuations, reduce the stability and flexibility of production plans, and in the long run, also restrict the motivation to optimize adsorption processes in the direction of energy conservation and consumption reduction. Summary of the Invention

[0008] Based on this, the purpose of this application is to provide a gas adsorption drying system based on off-peak electricity consumption, which has the advantage of greatly reducing the total cost of regeneration.

[0009] One aspect of this application provides a gas adsorption drying system based on off-peak electricity consumption, comprising a first adsorption system, a second adsorption system, a third adsorption system, and a regeneration system; the first adsorption system, the second adsorption system, and the third adsorption system are connected in parallel, and one end of the regeneration system is connected to the inlet of the first adsorption system, the inlet of the second adsorption system, and the inlet of the third adsorption system respectively via pipelines; its other end is connected to the outlet of the first adsorption system, the outlet of the second adsorption system, and the outlet of the third adsorption system respectively via pipelines.

[0010] The process material is adsorbed and dried sequentially through the first adsorption system, the second adsorption system, and the third adsorption system, and the individual operating cycle of the first adsorption system, the second adsorption system, and the third adsorption system is greater than or equal to 4 hours, so that at least two adsorption systems can be regenerated at night.

[0011] During regeneration, the first adsorption system, the second adsorption system, and the third adsorption system are regenerated respectively through the regeneration system.

[0012] Furthermore, the first adsorption system includes a first adsorption tower, and a first feed pipe and a first discharge pipe respectively connected to the inlet and outlet of the first adsorption tower; a first control valve is provided on the first feed pipe, and a first check valve is provided on the first discharge pipe;

[0013] The second adsorption system includes a second adsorption tower, and a second feed pipe and a second discharge pipe respectively connected to the inlet and outlet of the second adsorption tower; a second control valve is provided on the second feed pipe, and a second check valve is provided on the second discharge pipe;

[0014] The third adsorption system includes a third adsorption tower, and a third feed pipe and a third discharge pipe respectively connected to the inlet and outlet of the third adsorption tower; a third control valve is provided on the third feed pipe, and a third check valve is provided on the third discharge pipe.

[0015] One end of the regeneration system is connected to the feed pipe between the adsorption tower and the control valve via a pipeline, and the other end is connected to the discharge pipe between the adsorption tower and the check valve via a pipeline.

[0016] The regeneration system includes a blower, a heater, a cooler, a regeneration fresh air duct, and a regeneration exhaust pipe. The blower is installed upstream of the heater. The regeneration fresh air duct is used for the intake of the blower, and the regeneration exhaust pipe is used for the exhaust of the regeneration system. The cooler and the heater are connected in parallel to the regeneration system.

[0017] Furthermore, the regeneration system also includes a jacket and branch pipes;

[0018] Fit a sleeve onto the regenerated fresh air duct;

[0019] A branch pipe is installed at the end of the regenerated exhaust pipe, and the two ends of the branch pipe are connected to the regenerated exhaust pipe and the outer shell of the jacket, respectively; an end valve is provided downstream of the branch pipe connection of the regenerated exhaust pipe.

[0020] During the regeneration heating process, the end valve is closed, allowing hot air to flow through the branch pipe; during the regeneration cooling process, the end valve is opened, allowing hot air to be discharged from the end of the regeneration exhaust pipe.

[0021] The branch pipe is set vertically relative to the regeneration exhaust pipe. When the end valve is closed, the airflow enters the housing at one end of the jacket from the branch pipe and then exits from the other end of the jacket. When the end valve is open, the airflow exits from the end of the regeneration exhaust pipe.

[0022] Furthermore, the regeneration system also includes a branch sleeve, a first circulation pipe, a second circulation pipe, and a water storage tank;

[0023] The branch sleeve is fitted onto the branch pipe, and the water storage tank is placed diagonally above the branch sleeve;

[0024] The first circulation pipe is straight and placed at an angle, with its two ends connected to the shell of the branch sleeve and the water storage tank, respectively.

[0025] The second circulation pipe includes a horizontal section and a vertical section, with one end of the horizontal section and one end of the vertical section connected; the other end of the horizontal section is connected to the branch sleeve, and the other end of the vertical section is connected to the bottom of the water storage tank.

[0026] The connection point between the first circulation pipe and the water storage tank is higher than the connection point between the second circulation pipe and the water storage tank.

[0027] Multiple first circulation tubes are arranged in parallel, and multiple second circulation tubes are arranged in parallel;

[0028] The water flows in a circulation loop within the branch sleeve, the first circulation pipe, the water storage tank, and the second circulation pipe.

[0029] Furthermore, the regeneration system also includes a waste heat utilization pipe and a shut-off valve. The two ends of the waste heat utilization pipe are respectively vertically connected to the branch pipe, and the two ends of the waste heat utilization pipe are connected to the branch pipe downstream of the branch sleeve.

[0030] The waste heat utilization pipe extends horizontally through the upper part of the water storage tank in the middle, then bends back through a bend and extends through the upper part of the water storage tank again; this allows the airflow in the waste heat utilization pipe to exchange heat with the water in the upper part of the water storage tank.

[0031] The shut-off valve is installed on the branch pipe and located between the two ends of the waste heat utilization pipe. It is used to cut off the direct flow of air in the branch pipe and allow the air in the branch pipe to pass through the waste heat utilization pipe.

[0032] The waste heat utilization pipe, the first circulation pipe, and the second circulation pipe work together.

[0033] Furthermore, within one regeneration cycle of the three adsorption systems, the heater operates at rated power and achieves the rated regeneration time;

[0034] During another regeneration cycle of the three adsorption systems, the heater operates at a first power and achieves a first regeneration duration;

[0035] In another regeneration cycle of the three adsorption systems, the heater operates at a second power and obtains a second regeneration duration;

[0036] Among them, the first power is lower than the rated power, and the second power is higher than the rated power;

[0037] Compare the rated regeneration time, the first regeneration time, and the second regeneration time, and take the lowest value among the three as the target value, and take the power corresponding to the target value as the target power.

[0038] Furthermore, during a complete regeneration cycle, the heater operates at a third power and a fourth power, respectively, and obtains a third regeneration duration and a fourth regeneration duration, respectively;

[0039] The third power is less than the first power, and the fourth power is greater than the second power;

[0040] The third power, first power, rated power, second power, and fourth power form an arithmetic sequence;

[0041] Furthermore, the third power, the first power, the rated power, the second power, and the fourth power are all greater than the minimum power and less than the maximum power, respectively;

[0042] Determine whether the minimum value among the rated regeneration time, first regeneration time, second regeneration time, third regeneration time, and fourth regeneration time is the third regeneration time or the fourth regeneration time;

[0043] If so, then expand the common difference of the arithmetic sequence to obtain a new arithmetic sequence of power;

[0044] If not, then reduce the common difference of the arithmetic sequence and obtain a new arithmetic sequence of power.

[0045] Furthermore, during nighttime regeneration, after heating one adsorption system, the other adsorption system is heated; then one adsorption system is cooled and the other adsorption system is cooled.

[0046] During nighttime regeneration heating, the shut-off valve is in the open state;

[0047] During daytime regeneration heating, the shut-off valve is in the closed state.

[0048] Furthermore, the inner diameters of the regenerated fresh air duct, the branch duct, the regenerated exhaust duct, and the waste heat utilization duct are the same.

[0049] Furthermore, the jacket includes two snap-fit ​​covers; one end of one cover is connected to the branch pipe, and the other end of the other cover is connected to the terminal discharge pipe.

[0050] The cover is equipped with a spiral turbulence column, which is sleeved on the outside of the regeneration fresh air duct.

[0051] Beneficial effects:

[0052] At least two adsorption systems can be regenerated at night, and the electricity price at night is much lower than during the day or even during peak electricity consumption, thus greatly reducing the cost of regeneration.

[0053] The heat generated during nighttime regeneration is recovered through the regeneration system and can be reused during the day, saving energy consumption during daytime regeneration and further reducing regeneration costs.

[0054] Waste heat is stored in a water tank and recycled through a jacket, achieving a dual utilization effect.

[0055] Waste heat recovery does not require external power; it is accomplished through its own structure, thus saving energy.

[0056] To better understand and implement this application, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of a gas adsorption drying system based on off-peak electricity consumption, which is an example of this application.

[0058] Figure 2 The following are schematic diagrams illustrating the structural principles of three exemplary adsorption systems of this application;

[0059] Figure 3 This is a schematic diagram of the structural principle of an exemplary regeneration system of this application;

[0060] Figure 4 This is a schematic diagram of the adsorption process structure of the first adsorption system exemplified in this application;

[0061] Figure 5 This is a schematic diagram of the regeneration heating process of the first adsorption system exemplified in this application.

[0062] Figure 6 This is a schematic diagram of the regeneration cooling process of the first adsorption system exemplified in this application.

[0063] Figure 7 This is a three-dimensional structural diagram of one embodiment of the exemplary regeneration system (partial structure) of this application;

[0064] Figure 8 This is a three-dimensional structural diagram illustrating the assembly relationship between the jacket and the regenerated fresh air duct, which is an example of this application.

[0065] Figure 9 This is a three-dimensional structural diagram illustrating the connection relationship of the water storage tank, branch sleeve and its auxiliary pipelines, which is an example of this application.

[0066] Figure 10 Exemplary to this application Figure 9 Side view of the structure shown;

[0067] Figure 11 This is a three-dimensional structural diagram of another embodiment of the exemplary regeneration system (partial structure) of this application;

[0068] Figure 12 This is a three-dimensional structural schematic diagram from another perspective of another embodiment of the exemplary regeneration system (partial structure) of this application;

[0069] Figure 13 The flowchart illustrates the working principle of a gas adsorption drying system based on off-peak electricity consumption, which is an example of this application. Detailed Implementation

[0070] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0071] See Figures 1-12 As shown, this application exemplifies a gas adsorption drying system based on off-peak electricity consumption, comprising a first adsorption system, a second adsorption system, a third adsorption system, and a regeneration system; the first adsorption system, the second adsorption system, and the third adsorption system are connected in parallel, and one end of the regeneration system is connected to the inlet of the first adsorption system, the inlet of the second adsorption system, and the inlet of the third adsorption system respectively via pipelines; its other end is connected to the outlet of the first adsorption system, the outlet of the second adsorption system, and the outlet of the third adsorption system respectively via pipelines.

[0072] The process material is adsorbed and dried sequentially through the first adsorption system, the second adsorption system, and the third adsorption system, and the individual operating cycle of the first adsorption system, the second adsorption system, and the third adsorption system is greater than or equal to 4 hours, so that at least two adsorption systems can be regenerated at night.

[0073] During regeneration, the first adsorption system, the second adsorption system, and the third adsorption system are regenerated respectively through the regeneration system.

[0074] In some preferred embodiments, each adsorption system operates on an individual cycle of 8 hours. For example, the first adsorption system operates from 8:00 to 16:00, the second adsorption system operates from 16:00 to 24:00, and the third adsorption system operates from 24:00 to 8:00. Thus, during the operation of the third adsorption system, the first and second adsorption systems can be regenerated.

[0075] In some other preferred embodiments, each adsorption system operates on a separate cycle of 4 hours. For example, the first adsorption system operates from 8:00 to 12:00, the second adsorption system from 12:00 to 16:00, and the third adsorption system from 16:00 to 20:00. Then, regeneration of all three adsorption systems can be performed at night (20:00 to 8:00 the next day).

[0076] In some other preferred embodiments, the individual operating cycle of each adsorption system is 6 hours. For example, the first adsorption system operates from 8:00 to 14:00, the second adsorption system operates from 14:00 to 20:00, and the third adsorption system operates from 20:00 to 2:00 the next day. Therefore, the first and second adsorption systems can be regenerated during the night (20:00 to 8:00 the next day).

[0077] Electricity prices at night are at least 30% cheaper than during the day, so regenerating electricity at night can greatly reduce regeneration costs.

[0078] In some preferred embodiments, the first adsorption system includes a first adsorption tower, and a first feed pipe and a first discharge pipe respectively connected to the inlet and outlet of the first adsorption tower; a first control valve is provided on the first feed pipe, and a first check valve is provided on the first discharge pipe;

[0079] The second adsorption system includes a second adsorption tower, and a second feed pipe and a second discharge pipe respectively connected to the inlet and outlet of the second adsorption tower; a second control valve is provided on the second feed pipe, and a second check valve is provided on the second discharge pipe;

[0080] The third adsorption system includes a third adsorption tower, and a third feed pipe and a third discharge pipe respectively connected to the inlet and outlet of the third adsorption tower; a third control valve is provided on the third feed pipe, and a third check valve is provided on the third discharge pipe.

[0081] One end of the regeneration system is connected to the feed pipe between the adsorption tower and the control valve via a pipeline, and the other end is connected to the discharge pipe between the adsorption tower and the check valve via a pipeline.

[0082] The regeneration system includes a blower, a heater, a cooler, a regeneration fresh air duct, and a regeneration exhaust pipe. The blower is installed upstream of the heater. The regeneration fresh air duct is used for the intake of the blower, and the regeneration exhaust pipe is used for the exhaust of the regeneration system. The cooler and the heater are connected in parallel to the regeneration system.

[0083] In some preferred embodiments, the working principle is explained using the example of three towers alternating adsorption and regeneration.

[0084] First, the adsorption is carried out in turn in the first adsorption tower, the second adsorption tower, and the third adsorption tower. While the third adsorption tower is adsorbing, the pressure of the first adsorption tower is released because the adsorption process is carried out in a pressurized environment.

[0085] Then, the first adsorption tower is heated through the regeneration system while the second adsorption tower is depressurized. At this time, the third adsorption tower is in operation and undergoing adsorption. After the first adsorption tower has finished heating, it enters the heat preservation process, and the second adsorption tower is heated.

[0086] Secondly, after the second adsorption tower has finished heating, it enters the heat preservation process and the first adsorption tower is cooled; after the first adsorption tower has finished cooling, the second adsorption tower is cooled and the first adsorption tower is pressurized; at this time, the third adsorption tower is in the adsorption process.

[0087] Next, once the second adsorption tower has finished cooling, it is pressurized. At the same time, the first adsorption tower is connected to the system and put into operation for adsorption. After the first and third adsorption towers have been running in parallel for a period of time, the third adsorption tower is disconnected from the system for regeneration. Meanwhile, the first and second adsorption towers perform adsorption processes in sequence.

[0088] Finally, the regeneration of the third adsorption tower includes depressurization, heating, cooling, and pressurization. After pressurization is completed, it is in standby mode.

[0089] See Figure 13 As shown, the above process can also be illustrated using three towers, A, B, and C (where tower A corresponds to the first adsorption tower, tower B corresponds to the second adsorption tower, and tower C corresponds to the third adsorption tower), and a flow chart is provided.

[0090] Tower A adsorption, Towers B and C standby → Tower A waiting, Tower B adsorption, Tower C standby → Tower A depressurization, Tower B waiting, Tower C adsorption → Tower A heating, Tower B depressurization, Tower C adsorption → Tower A insulation, Tower B heating, Tower C adsorption → Tower A cooling, Tower B insulation, Tower C adsorption → Tower A pressurization, Tower B cooling, Tower C adsorption → Tower A standby, Tower B pressurization, Tower C adsorption → Tower A adsorption, Tower B standby, Tower C gradually phased out → Tower A adsorption, Tower B standby, Tower C regeneration (including the entire regeneration process of depressurization, heating, cooling, and pressurization). Tower C can be kept warm after heating during regeneration and before cooling, or it can be left warm.

[0091] For the appendix Figure 1-5 This section explains some of the components and their principles.

[0092] Valve PV16 is normally closed, so airflow will not pass through valve PV16 in either the normal adsorption process or the regeneration process.

[0093] Valve PV1 is used to control the air inlet switch for adsorption in tower A, valve PV2 is used to control the air inlet switch for adsorption in tower B, and valve PV3 is used to control the air inlet switch for adsorption in tower C.

[0094] Valves PV4 and PV10 are used to control the inlet and outlet gas switches during the regeneration of tower A; valves PV5 and PV11 are used to control the inlet and outlet gas switches during the regeneration of tower B; valves PV6 and PV12 are used to control the inlet and outlet gas switches during the regeneration of tower C.

[0095] Valve PV7 is used for depressurization of tower A, valve PV8 is used for depressurization of tower B, and valve PV9 is used for depressurization of tower C.

[0096] Valve PV15 is used to control the opening and closing of the regeneration fresh air duct, valve PV16 is used to control the opening and closing of the regeneration exhaust duct; valve PV13 is used to control the air inlet switch of the cooler, and valve PV14 is used to control the air inlet switch of the heater.

[0097] Valves PV17, PV18, and PV19 form bypasses with their corresponding check valves. The adsorption gas from the three towers can pass through the check valves, or through PV17, PV18, and PV19 respectively, or through both the check valves and the corresponding valves in PV17, PV18, and PV19.

[0098] Figure 1 The diagram of the entire adsorption drying system is provided. Figure 2 The diagram provides a schematic showing the connection relationship between three towers (excluding the regeneration system); Figure 3 A schematic diagram of the regeneration system is provided; Figure 4 A schematic diagram of the adsorption process in tower A is provided; Figure 5 A schematic diagram of the regeneration and heating process in tower A is provided. Figure 6A schematic diagram of the regeneration and cooling process for tower A is provided. The adsorption, regeneration heating, and regeneration cooling processes for towers B and C are explained by referring to the principle of tower A.

[0099] In some preferred embodiments, the regeneration system further includes a jacket 30 and a branch pipe 40;

[0100] A sleeve 30 is fitted onto the regenerated fresh air duct 10;

[0101] A branch pipe 40 is installed at the end of the regenerated exhaust pipe 20, and the two ends of the branch pipe 40 are respectively connected to the outer shell of the regenerated exhaust pipe 20 and the jacket 30; an end valve is provided downstream of the connection of the branch pipe 40 to the regenerated exhaust pipe 20.

[0102] During the regeneration heating process, the end valve is closed, allowing hot air to flow through the branch pipe 40; during the regeneration cooling process, the end valve is opened, allowing hot air to be discharged from the end of the regeneration exhaust pipe 20.

[0103] The branch pipe 40 is arranged vertically relative to the regeneration exhaust pipe 20. When the end valve is closed, the airflow enters the housing at one end of the jacket 30 from the branch pipe 40 and then exits from the other end of the jacket 30. When the end valve is open, the airflow exits from the end of the regeneration exhaust pipe 20.

[0104] In some preferred embodiments, the regeneration system further includes a branch sleeve 51, a first circulation pipe 54, a second circulation pipe 53, and a water storage tank 52;

[0105] The branch sleeve 51 is sleeved on the branch pipe 40, and the water storage tank 52 is placed diagonally above the branch sleeve 51.

[0106] The first circulation pipe 54 is straight and placed at an angle, with its two ends connected to the shell of the branch sleeve 51 and the water storage tank 52, respectively.

[0107] The second circulation pipe 53 includes a horizontal section and a vertical section, one end of the horizontal section and one end of the vertical section are connected; the other end of the horizontal section is connected to the branch sleeve 51, and the other end of the vertical section is connected to the bottom of the water storage tank 52.

[0108] The connection point between the first circulation pipe 54 and the water storage tank 52 is higher than the connection point between the second circulation pipe 53 and the water storage tank 52.

[0109] Multiple first circulation tubes 54 are arranged in parallel, and multiple second circulation tubes 53 are arranged in parallel.

[0110] Water circulates within the branch sleeve 51, the first circulation pipe 54, the water storage tank 52, and the second circulation pipe 53.

[0111] In some preferred embodiments, the regeneration system further includes a waste heat utilization pipe 60 and a shut-off valve. The two ends of the waste heat utilization pipe 60 are respectively vertically connected to the branch pipe 40, and the two ends of the waste heat utilization pipe 60 are connected to the branch pipe 40 downstream of the branch sleeve 51.

[0112] like Figure 11 and Figure 12 The waste heat utilization pipe 60 extends horizontally through the upper part of the water storage tank 52 in the middle, bends back through a bend, and then extends through the upper part of the water storage tank 52 again; so that the airflow in the waste heat utilization pipe 60 can exchange heat with the water in the upper part of the water storage tank 52.

[0113] The shut-off valve is installed on the branch pipe 40 and located between the two ends of the waste heat utilization pipe 60. It is used to cut off the direct flow of air in the branch pipe 40 and to allow the air in the branch pipe 40 to pass through the waste heat utilization pipe 60.

[0114] The waste heat utilization pipe 60, the first circulation pipe 54, and the second circulation pipe 53 work together.

[0115] The purpose of setting up the shut-off valve and waste heat utilization pipe 60 is mainly to deal with the heat utilization during daytime regeneration heating, thereby reducing the energy consumption of daytime regeneration heating.

[0116] In some preferred embodiments, the inner diameters of the regenerated fresh air duct 10, the branch duct 40, the regenerated exhaust duct 20, and the waste heat utilization duct 60 are the same.

[0117] In some preferred embodiments, the jacket 30 includes two snap-fit ​​covers 31; one end of one cover 31 is connected to the branch pipe 40, and the other end of the other cover 31 is connected to the terminal discharge pipe (not shown in the figure).

[0118] A spiral turbulence column (not shown) is provided inside the cover 31, and the spiral turbulence column is sleeved on the outside of the regeneration fresh air duct 10.

[0119] The purpose of setting up the spiral turbulence column is to disturb the airflow in the jacket 30, increase turbulence, and improve the heat exchange effect between the airflow in the jacket 30 and the regenerated fresh air duct 10.

[0120] In the attached diagram, a shut-off valve is installed at the flange where point A is located; an end valve is installed at the flange where point B is located.

[0121] Combination Figures 5-12 As shown, and with Figure 5 process and Figure 12 The working principle of the regeneration system is explained based on its structure.

[0122] The ambient temperature air flowing through the regeneration fresh air duct 10 enters the regeneration system and is finally discharged from the regeneration exhaust duct 20. The entire regeneration heating process can be referred to... Figure 5 The flowchart shown.

[0123] In the regenerative heating process, especially the nighttime regenerative heating process, the terminal valve is closed, allowing hot air to exit only through branch pipe 40 and then through jacket 30 before being discharged. During this process, the water in branch sleeve 51 on branch pipe 40 is heated, and the hot air in jacket 30 heats the air in regenerative fresh air duct 10, increasing the intake air temperature of the regeneration system and achieving waste heat recovery and reuse. In this process, the waste heat of the regeneration system is absorbed in two parts: one part is the water in branch sleeve 51, and the other part is the air in regenerative fresh air duct 10.

[0124] After regeneration heating is complete, the system enters the heat preservation or cooling process. At this time, the terminal valve is open, and the gas in the regeneration system is discharged through the regeneration exhaust pipe 20. If the water temperature in the water storage tank 52 is higher than the room temperature at this time, the heat in the water storage tank 52 will not be easily dissipated.

[0125] For the regeneration heating of the third adsorption system, if it is carried out during the day (in this invention, daytime refers to 8:00-20:00), further energy saving is achieved by utilizing the heat in the water storage tank 52.

[0126] Here, the working principle of the water storage tank 52 and the branch sleeve 51 will be explained.

[0127] When the temperature of the water in the storage tank 52 is lower than the temperature of the airflow in the branch pipe 40, the water in the branch sleeve 51 absorbs heat and rises through the first circulation pipe 54 into the storage tank 52, while the water in the storage tank 52 with a lower temperature flows into the branch sleeve 51 through the second circulation pipe 53, so that the water in the storage tank 52 is continuously heated and its temperature rises.

[0128] During the regeneration heating of the third adsorption system, the terminal valve and the shut-off valve are closed, allowing airflow to sequentially enter the branch pipe 40 and the waste heat utilization pipe 60. The waste heat utilization pipe 60 exchanges heat with the hot water in the water storage tank 52. Since the hotter water is at the top of the water storage tank 52, while the cooler water sinks to the bottom, the heat in the water storage tank 52 is continuously carried away by the airflow in the waste heat utilization pipe 60. The carried-away heat enters the jacket 30 to heat the air in the regeneration fresh air duct 10. In this process, the heat in the water storage tank 52 is fully utilized, and the airflow in the fresh air intake pipe is heated, thereby achieving energy saving and consumption reduction, ultimately reducing the total regeneration cost. Therefore, during the regeneration heating of the first and second adsorption systems, the shut-off valve is open, and the water temperature in the water storage tank 52 continuously rises; while during the regeneration heating of the third adsorption system, the shut-off valve is closed, and the water temperature in the water storage tank 52 continuously decreases, thus achieving energy saving, consumption reduction, and cost reduction.

[0129] In some preferred embodiments, the heater operates at rated power and achieves rated regeneration time during one regeneration cycle of the three adsorption systems;

[0130] During another regeneration cycle of the three adsorption systems, the heater operates at a first power and achieves a first regeneration duration;

[0131] In another regeneration cycle of the three adsorption systems, the heater operates at a second power and obtains a second regeneration duration;

[0132] Among them, the first power is lower than the rated power, and the second power is higher than the rated power;

[0133] Compare the rated regeneration time, the first regeneration time, and the second regeneration time, and take the lowest value among the three as the target value, and take the power corresponding to the target value as the target power.

[0134] In some preferred embodiments, the heater operates at a third power and a fourth power respectively during a whole regeneration cycle, and obtains a third regeneration duration and a fourth regeneration duration respectively;

[0135] The third power is less than the first power, and the fourth power is greater than the second power;

[0136] The third power, first power, rated power, second power, and fourth power form an arithmetic sequence;

[0137] Furthermore, the third power, the first power, the rated power, the second power, and the fourth power are all greater than the minimum power and less than the maximum power, respectively;

[0138] Determine whether the minimum value among the rated regeneration time, first regeneration time, second regeneration time, third regeneration time, and fourth regeneration time is the third regeneration time or the fourth regeneration time;

[0139] If so, then expand the common difference of the arithmetic sequence to obtain a new arithmetic sequence of power;

[0140] If not, then reduce the common difference of the arithmetic sequence and obtain a new arithmetic sequence of power.

[0141] In some preferred embodiments, during nighttime regeneration, after heating one adsorption system, heating the other adsorption system is performed; then one adsorption system is cooled and the other adsorption system is cooled.

[0142] During nighttime regeneration heating, the shut-off valve is in the open state;

[0143] During daytime regeneration heating, the shut-off valve is in the closed state.

[0144] In the relationship between regeneration heating power and regeneration time, there is an L-shaped curve. If the horizontal axis is the regeneration heating power and the vertical axis is the regeneration time, and the criterion for regeneration completion is the outlet humidity, the regeneration time and regeneration heating power are not positively correlated. Instead, as the heating power increases, the regeneration time first shortens and then lengthens, showing a state of rapid shortening and slow lengthening, presenting an L-shaped curve.

[0145] In the relationship between regeneration heating power and regeneration time, heating with rated power is not the optimal heating time. Therefore, this invention sets multiple heating powers and finds the optimal heating power corresponding to the system structure of this invention, thereby achieving the lowest and optimal total regeneration cost.

[0146] Based on this, when the heating power corresponding to the minimum of the five regeneration times is located at the endpoints, it indicates that the optimal value is on one side of the inflection point of the curve, and all five values ​​are located on the same side of the inflection point. The inflection point can be found by increasing the tolerance of the heating power. If the heating power corresponding to the minimum regeneration time is among the three middle values, it indicates that the inflection point is located in the middle of the five heating powers. The inflection point can be found by reducing the tolerance of the heating power. This inflection point is the optimal heating power that this invention seeks, under which the overall regeneration cost is lowest. Of course, it is not required to find the value at the inflection point; values ​​near the inflection point can also be considered as the optimal heating power. This is done to reduce the number of times the inflection point needs to be found.

[0147] This gas adsorption drying system based on off-peak electricity consumption has achieved multiple breakthroughs in cost control, energy consumption optimization, efficiency improvement, and environmental friendliness through structural improvements and adjustments to operating rules. The specific beneficial effects are as follows:

[0148] I. Peak-shifting electricity consumption significantly reduces regeneration costs and optimizes the economics of electricity use.

[0149] Nighttime low-electricity-price regeneration directly reduces core cost expenditures. In the system design, the individual operating cycles of the first, second, and third adsorption systems are ≥4 hours, ensuring that at least two adsorption systems can complete regeneration overnight within a 24-hour cycle. Since nighttime electricity prices are typically lower than daytime prices, especially during peak electricity consumption periods, the heating stage, which accounts for the highest energy consumption during regeneration, is mainly carried out during low-electricity-price periods. This reduces electricity costs for regeneration from the source, significantly lowering the system's operating costs.

[0150] Peak-shifting electricity consumption balances the grid load, offering potential benefits. By shifting energy-intensive regeneration processes to nighttime, the load pressure during peak daytime electricity consumption is effectively avoided. In some regions, electricity price subsidies or reductions are provided to enterprises participating in peak-shifting, further enhancing the system's economic advantages.

[0151] II. Multi-stage waste heat recovery and storage enables efficient energy recycling.

[0152] The dual waste heat recovery structure maximizes heat utilization. The regeneration system achieves waste heat recovery through a dual design of "jacket preheating + water tank heat storage":

[0153] During nighttime regeneration heating, the terminal valve is closed to allow hot air to enter the jacket through the branch pipe. The spiral turbulence column inside the jacket enhances the heat exchange between the hot air and the regeneration fresh air duct, preheating the fresh air entering the blower and reducing the energy input of the heater.

[0154] The branch sleeve outside the branch pipe forms a natural circulation with the water storage tank through the first and second circulation pipes, transferring the waste heat of the branch pipe to the water storage tank for storage. At the same time, the waste heat utilization pipe further introduces the heat downstream of the branch pipe into the upper part of the water storage tank, realizing the stratified storage of heat. The dual recovery mechanism effectively captures the waste heat in the regeneration process, greatly reducing heat waste.

[0155] Diurnal heat management significantly reduces daytime regeneration energy consumption. Waste heat stored overnight is reused during daytime regeneration through methods such as jacket preheating of fresh air and auxiliary heating with hot water from the storage tank, reducing the heater's power requirements during peak electricity price periods. Actual measurement data shows that heater energy consumption is reduced during daytime regeneration, further compressing overall daily operating costs.

[0156] Third, the waste heat is recycled without power, saving energy and reducing equipment complexity.

[0157] Self-driven heat recovery with zero additional energy consumption. The waste heat recovery system requires no external power equipment; energy transfer is achieved solely through structural design: the height difference of the circulation pipe drives water circulation between the storage tank and the branch sleeve, and the natural airflow promotes heat exchange between the jacket and the branch pipe. This design not only reduces equipment investment but also avoids the energy consumption and maintenance costs of power equipment, achieving the dual benefits of "energy saving + cost reduction".

[0158] The system features a compact and reliable structure with low maintenance costs. Core waste heat recovery components, such as jackets, branch pipes, and circulation pipes, are all static structures with no complex moving parts, resulting in a low failure rate. Compared to traditional waste heat recovery systems that require heat exchangers and power pumps, the system offers reduced maintenance frequency and superior long-term operational economy.

[0159] IV. Intelligent power regulation, precise matching of regeneration efficiency and energy consumption.

[0160] Dynamic power optimization finds the balance between energy consumption and efficiency. The system tests regeneration times at different power levels, such as rated power, first / second / third / fourth power, and uses the power corresponding to the shortest regeneration time as the target power, achieving precise "power-efficiency" matching. This mechanism avoids the problems of "excessive power wasting energy" or "excessive power prolonging regeneration time" in traditional fixed-power operation, thus reducing energy consumption per unit of regeneration.

[0161] Adaptive tolerance adjustment continuously optimizes operating parameters. By expanding / reducing the power arithmetic series tolerance, it dynamically adapts to different operating conditions, ensuring that the system is always in the optimal operating state and maintaining a stable output with high efficiency and low power consumption.

[0162] V. Continuous and stable operation ensures process reliability.

[0163] The three-tower rotating design ensures uninterrupted adsorption and drying. The three adsorption systems operate in parallel and alternately. While one system is adsorbing, the other two can regenerate alternately, ensuring a continuous and uninterrupted drying process for the process materials. This avoids production delays caused by regeneration shutdowns and improves the overall stability and capacity of the production line.

[0164] Regeneration and adsorption are controlled independently, offering high operational flexibility. The regeneration system and adsorption system are independently isolated via control valves and check valves. Regeneration parameters can be adjusted individually according to the state of the adsorption tower, adapting to material handling needs with different humidity loads and thus having a wider range of applications.

[0165] VI. It has prominent green and environmentally friendly attributes, which help low-carbon production.

[0166] Reduced energy consumption leads to reduced carbon emissions. By implementing peak-shifting electricity consumption and waste heat recovery, the overall energy consumption of the system is reduced, resulting in a significant decrease in carbon emissions per unit of product, thus helping enterprises achieve green production transformation.

[0167] It produces no pollutants and is environmentally friendly. During the regeneration process, the waste gas is treated by a cooler before being discharged, and the waste heat recovery process generates no additional pollutants. The entire system operates cleanly and environmentally friendly, avoiding the waste gas pollution problems that may exist in traditional drying equipment.

[0168] In summary, this system achieves multiple goals of "cost reduction, energy consumption optimization, efficiency improvement, and environmental compliance" through the synergistic effect of peak-shifting power consumption strategy, multi-stage waste heat recovery technology, intelligent power regulation, and non-powered structure design, providing an economical and efficient green solution for the gas adsorption drying field.

[0169] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A gas adsorption drying system based on off-peak electricity use, characterized by: The system comprises a first adsorption system, a second adsorption system, a third adsorption system, and a regeneration system; the first adsorption system, the second adsorption system, and the third adsorption system are connected in parallel, and one end of the regeneration system is connected to the inlet of the first adsorption system, the inlet of the second adsorption system, and the inlet of the third adsorption system through pipelines respectively; The other end of the regeneration system is connected to the outlet of the first adsorption system, the outlet of the second adsorption system, and the outlet of the third adsorption system through pipelines respectively; The first adsorption system, the second adsorption system, and the third adsorption system are used to adsorb and dry process materials in turn, and the single operation cycle of each of the first adsorption system, the second adsorption system, and the third adsorption system is greater than or equal to 4 hours, so that at least two of the adsorption systems can be regenerated at night; During regeneration, the first adsorption system, the second adsorption system, and the third adsorption system are regenerated by the regeneration system respectively; The regeneration system comprises a blower, a heater, a cooler, a regeneration fresh air pipe, and a regeneration exhaust pipe; The regeneration system further comprises a jacket and a branch pipe; The jacket is sleeved on the regeneration fresh air pipe; The branch pipe is installed at the end of the regeneration exhaust pipe, and the two ends of the branch pipe are connected to the regeneration exhaust pipe and the shell of the jacket respectively; a terminal valve is arranged downstream of the regeneration exhaust pipe at the connection position of the branch pipe; The regeneration system further comprises a branch sleeve, a first circulation pipe, a second circulation pipe, and a water storage tank; The branch sleeve is sleeved on the branch pipe, and the water storage tank is placed obliquely above the branch sleeve; The two ends of the first circulation pipe are connected to the shell of the branch sleeve and the water storage tank respectively; One end of the second circulation pipe is connected to the branch sleeve, and the other end of the second circulation pipe is connected to the bottom of the water storage tank; The regeneration system further comprises a waste heat utilization pipe and a shut-off valve; the two ends of the waste heat utilization pipe are connected to the branch pipe perpendicularly, and the two ends of the waste heat utilization pipe are connected to the branch pipe downstream of the branch sleeve; The middle part of the waste heat utilization pipe transversely penetrates the upper part of the water storage tank, is bent back in the form of an elbow, and penetrates the upper part of the water storage tank again; so that the airflow in the waste heat utilization pipe can exchange heat with the water in the upper part of the water storage tank; The shut-off valve is installed on the branch pipe between the two ends of the waste heat utilization pipe, and is used to cut off the direct flow of the airflow on the branch pipe and make the airflow on the branch pipe pass through the waste heat utilization pipe; The waste heat utilization pipe, the first circulation pipe, and the second circulation pipe work cooperatively.

2. The gas adsorption drying system based on staggered electricity use according to claim 1, wherein: The first adsorption system comprises a first adsorption tower, a first feed pipe, and a first discharge pipe connected to the inlet and outlet of the first adsorption tower respectively; a first control valve is arranged on the first feed pipe, and a first check valve is arranged on the first discharge pipe; The second adsorption system comprises a second adsorption tower, a second feed pipe, and a second discharge pipe connected to the inlet and outlet of the second adsorption tower respectively; a second control valve is arranged on the second feed pipe, and a second check valve is arranged on the second discharge pipe; The third adsorption system comprises a third adsorption tower, a third feed pipe and a third discharge pipe connected to the inlet and outlet of the third adsorption tower respectively; a third control valve is arranged on the third feed pipe, and a third one-way valve is arranged on the third discharge pipe; One end of the regeneration system is connected to the feed pipe between the adsorption tower and the control valve through a pipeline, and the other end is connected to the discharge pipe between the adsorption tower and the one-way valve through a pipeline; The air blower is installed upstream of the heater, the regeneration fresh air pipe is used for air inlet of the air blower, and the regeneration exhaust pipe is used for exhaust of the regeneration system; the cooler and the heater are connected in parallel to the regeneration system.

3. The gas adsorption drying system based on off-peak electricity according to claim 2, wherein: when the regeneration heating process is performed, the end valve is closed, so that the hot gas flows through the branch pipe; when the regeneration cooling process is performed, the end valve is opened, so that the hot gas is discharged from the end of the regeneration exhaust pipe; The branch pipe is vertically arranged relative to the regeneration exhaust pipe, when the end valve is closed, the gas flows into the shell at one end of the jacket from the branch pipe, and is discharged from the other end of the jacket; when the end valve is opened, the gas is discharged from the end of the regeneration exhaust pipe.

4. The gas adsorption drying system based on off-peak electricity according to claim 3, wherein: the first circulation pipe is linear and obliquely arranged; The second circulation pipe comprises a horizontal section and a vertical section, one end of the horizontal section is connected to one end of the vertical section; the other end of the horizontal section is connected to the branch jacket, and the other end of the vertical section is connected to the bottom of the water storage tank; The connection between the first circulation pipe and the water storage tank is higher than the connection between the second circulation pipe and the water storage tank; A plurality of first circulation pipes are arranged in parallel, and a plurality of second circulation pipes are arranged in parallel; The water flows in the branch jacket, the first circulation pipe, the water storage tank and the second circulation pipe.

5. The gas adsorption drying system based on off-peak electricity according to claim 4, wherein: in one regeneration cycle of the three adsorption systems, the heater operates at rated power and obtains a rated regeneration time; In another regeneration cycle of the three adsorption systems, the heater operates at a first power and obtains a first regeneration time; In still another regeneration cycle of the three adsorption systems, the heater operates at a second power and obtains a second regeneration time; The first power is lower than the rated power, and the second power is higher than the rated power; The rated regeneration time, the first regeneration time and the second regeneration time are compared, and the minimum value among the three is taken as a target value, and the power corresponding to the target value is taken as a target power. In a whole regeneration cycle, the heater operates at a third power and a fourth power respectively, and obtains a third regeneration time and a fourth regeneration time respectively; The third power is less than the first power, and the fourth power is greater than the second power; The third power, the first power, the rated power, the second power and the fourth power form an arithmetic sequence; 6. The gas adsorption drying system based on off-peak electricity use according to claim 5, characterized in that: The third power, the first power, the rated power, the second power and the fourth power are greater than the minimum power respectively, and are less than the maximum power respectively. ​ ​ ​ determining whether the minimum value among the rated regeneration time length, the first regeneration time length, the second regeneration time length, the third regeneration time length and the fourth regeneration time length is the third regeneration time length or the fourth regeneration time length; if yes, expanding the common difference of the arithmetic sequence and obtaining a new arithmetic sequence of power; if no, reducing the common difference of the arithmetic sequence and obtaining a new arithmetic sequence of power.

7. The gas adsorption drying system based on off-peak electricity use of claim 4, wherein: During the night regeneration, after one adsorption system is heated, the other adsorption system is heated; and then one adsorption system is cooled and the other adsorption system is cooled. During the night regeneration, the cutoff valve is in an open state. During the day regeneration, the cutoff valve is in a closed state.

8. The gas adsorption drying system based on off-peak electricity use according to claim 7, characterized in that: The inner diameters of the regeneration fresh air pipe, the branch pipe, the regeneration exhaust pipe and the waste heat utilization pipe are the same.

9. The gas adsorption drying system based on off-peak electricity use according to any one of claims 3-8, characterized in that: The jacket includes two cover bodies which can be buckled; one end of one cover body is connected with the branch pipe, and the other end of the other cover body is connected with the end discharge pipe. The cover body is internally provided with a spiral turbulent flow column which is sleeved on the outside of the regeneration fresh air pipe.

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