Adsorption method carbon dioxide capture control method, storage medium and electronic equipment

Abstract

The invention discloses an adsorption method carbon dioxide capture control method, a storage medium and electronic equipment. The method comprises the following steps: obtaining a preset empty tower gas velocity of an adsorption tower according to a preset gas velocity operation model; obtaining a preset adsorption capacity of the adsorbent according to a preset capacity operation model; obtaining the actual gas inlet pressure of the adsorption tower according to a preset pressure operation model; according to the actual inlet air pressure and the average carbon dioxide concentration, the carbon dioxide partial pressure value in actual inlet air is obtained; determining the actual adsorption capacity according to the carbon dioxide partial pressure relation curve and the carbon dioxide partial pressure value; obtaining an actual operation period of the attached tower according to a preset period operation model; controlling the pressure of the adsorption tower and the operation state of flow adjusting equipment, so that the air inlet pressure of the adsorption tower is consistent with the actual air inlet pressure, and the operation cycle of the adsorption tower is consistent with the actual operation cycle. By means of the scheme, the adaptability and stability of the adsorption device to air inlet working condition fluctuation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture by adsorption method, and particularly relates to a control method, a storage medium and an electronic device for carbon dioxide capture by adsorption method. Background Art

[0002] The amount of carbon dioxide emitted with flue gas in thermal power plants accounts for the highest proportion in the total carbon dioxide emissions. Achieving low-energy consumption carbon dioxide capture from power plant flue gas is one of the important ways to achieve the dual-carbon goals (carbon peak by 2030 and carbon neutrality by 2060). The carbon dioxide capture technology by adsorption method has the advantages of low energy consumption and low environmental risk, and is a good carbon emission reduction technology with good application prospects. Usually, the carbon dioxide capture device by adsorption method in power plant flue gas is designed according to the parameters of flue gas under a certain fixed operating condition of the generating unit or the average operating condition in a certain period. However, during the actual operation process, due to the change of the operating condition of the generating unit, the flow rate and components of the flue gas will also change accordingly, which will affect the operation of the carbon dioxide capture system and lead to poor carbon dioxide capture effect. Summary of the Invention

[0003] The technical problem to be solved by the present invention is the technical problem that the existing carbon dioxide capture scheme by adsorption method has a poor response when the operating condition of the generating unit changes. For this reason, the present invention proposes a control method, a storage medium and an electronic device for carbon dioxide capture by adsorption method.

[0004] In view of the above technical problems, the present invention provides the following technical solutions:

[0005] In the first aspect, the technical solution of the present application provides a control method for carbon dioxide capture by adsorption method, including:

[0006] Obtaining the preset inlet gas flow rate, preset inlet gas pressure, cross-sectional area of the adsorption tower, preset adsorption tower operation cycle, preset inlet gas concentration and adsorbent filling amount of the adsorption tower;

[0007] According to the preset gas velocity calculation model, combining the preset inlet gas flow rate, the preset inlet gas pressure and the cross-sectional area to obtain the preset empty tower gas velocity of the adsorption tower;

[0008] According to the preset capacity calculation model, combining the preset adsorption tower operation cycle, the preset inlet gas flow rate, the preset inlet gas concentration and the adsorbent filling amount to obtain the preset adsorption capacity of the adsorbent;

[0009] Collecting the average flue gas flow rate and the average carbon dioxide concentration in the flue gas within a set time period;

[0010] According to the preset pressure operation model, the actual inlet pressure of the adsorption tower is obtained by combining the average flue gas flow rate, the preset superficial gas velocity, and the cross-sectional area.

[0011] According to the actual inlet pressure and the average carbon dioxide concentration, the carbon dioxide partial pressure value in the actual inlet gas is obtained.

[0012] The actual adsorption capacity is determined according to the carbon dioxide partial pressure relationship curve and the carbon dioxide partial pressure value; the carbon dioxide partial pressure relationship curve is a mapping relationship curve between the adsorption capacity and the carbon dioxide partial pressure value.

[0013] According to the preset cycle operation model, the actual operation cycle of the adsorption tower is obtained by combining the adsorbent filling amount, the actual adsorption capacity, the average flue gas flow rate, and the average carbon dioxide concentration.

[0014] According to the difference value between the actual adsorption capacity and the preset adsorption capacity, the operating states of the pressure and flow regulating devices of the adsorption tower are controlled to make the inlet pressure of the adsorption tower consistent with the actual inlet pressure, and the operation cycle of the adsorption tower consistent with the actual operation cycle.

[0015] In some embodiments of the adsorption method for carbon dioxide capture control method, in the step of obtaining the preset superficial gas velocity of the adsorption tower by combining the preset inlet gas flow rate, the preset inlet pressure, and the cross-sectional area according to the preset gas velocity operation model:

[0016] The preset gas velocity operation model is:

[0017]

[0018] Wherein, v0 represents the preset superficial gas velocity, Q0 represents the preset inlet gas flow rate, P0 represents the preset inlet pressure, A represents the cross-sectional area, and W1, W2, and W3 are operation coefficients.

[0019] In some embodiments of the adsorption method for carbon dioxide capture control method, in the step of obtaining the preset adsorption capacity of the adsorbent by combining the preset operation cycle of the adsorption tower, the preset inlet gas flow rate, the preset inlet concentration, and the adsorbent filling amount according to the preset capacity operation model:

[0020] The preset capacity operation model is:

[0021]

[0022] Wherein, q0 represents the preset adsorption capacity, T0 represents the preset operation cycle of the adsorption tower, y0 represents the preset inlet concentration, m0 represents the adsorbent filling amount, and W4 represents the operation coefficient.

[0023] In some of the described methods for controlling carbon dioxide capture by adsorption, in obtaining the actual inlet pressure of the adsorption tower according to the preset pressure operation model, combining the average flue gas flow rate, the preset superficial gas velocity, and the cross-sectional area:

[0024] The preset pressure operation model is:

[0025]

[0026] where P represents the actual inlet pressure and Q represents the average flue gas flow rate.

[0027] In some of the described methods for controlling carbon dioxide capture by adsorption, in obtaining the actual operating cycle of the adsorption tower according to the preset cycle operation model, combining the adsorbent loading, the actual adsorption capacity, the average flue gas flow rate, and the average carbon dioxide concentration:

[0028] The preset cycle operation model is:

[0029]

[0030] where T represents the actual operating cycle and y represents the average carbon dioxide concentration.

[0031] In some of the described methods for controlling carbon dioxide capture by adsorption, in collecting the average flue gas flow rate and the average carbon dioxide concentration in the flue gas within a set time period:

[0032] The set time period is 1 hour to 30 days.

[0033] In some of the described methods for controlling carbon dioxide capture by adsorption, the pressure and flow regulating device includes a booster fan and a backpressure valve; controlling the operating state of the pressure and flow regulating device of the adsorption tower includes:

[0034] Controlling the guide vane opening and motor frequency of the booster fan and controlling the opening of the backpressure valve.

[0035] In a second aspect, a computer program product includes a computer program / instructions, characterized in that when the computer program / instructions are executed by a processor, the steps of the method for controlling carbon dioxide capture by adsorption according to any one of claims 1-7 are implemented.

[0036] In a third aspect, the technical solution of the present application provides a storage medium, in which program information is stored, and after a computer reads the program information, it executes the method for controlling carbon dioxide capture by adsorption according to any one of the first aspects.

[0037] Fourthly, the present application provides an electronic device, which includes at least one processor and at least one memory. Program information is stored in at least one of the memories, and after reading the program information, at least one of the processors executes the adsorption method carbon dioxide capture control method according to any one of the first aspects.

[0038] The technical solution of the present invention has the following technical effects compared with the prior art:

[0039] The adsorption method carbon dioxide capture control method, storage medium and electronic device provided by the present invention, the method includes: according to a preset gas velocity operation model, combining the preset inlet gas flow rate, preset inlet gas pressure and cross-sectional area to obtain the preset superficial gas velocity of the adsorption tower; according to a preset capacity operation model, combining the preset adsorption tower operation cycle, preset inlet gas flow rate, preset inlet gas concentration and adsorbent filling amount to obtain the preset adsorption capacity of the adsorbent; according to a preset pressure operation model, combining the average flue gas flow rate, preset superficial gas velocity and cross-sectional area to obtain the actual inlet gas pressure of the adsorption tower; obtaining the carbon dioxide partial pressure value in the actual inlet gas according to the actual inlet gas pressure and the average carbon dioxide concentration; determining the actual adsorption capacity according to the carbon dioxide partial pressure relationship curve and the carbon dioxide partial pressure value; according to a preset cycle operation model, combining the adsorbent filling amount, actual adsorption capacity, average flue gas flow rate, average carbon dioxide concentration to obtain the actual operation cycle of the adsorption tower; controlling the operation state of the pressure and flow regulating equipment of the adsorption tower according to the difference value between the actual adsorption capacity and the preset adsorption capacity, so that the inlet gas pressure of the adsorption tower is consistent with the actual inlet gas pressure, and the operation cycle of the adsorption tower is consistent with the actual operation cycle. Through the above solution of the present invention, the operation efficiency of the adsorption tower is improved, and the adsorption breakthrough phenomenon that may occur during the long-term operation of the adsorption tower under the condition of high inlet gas flow rate and CO2 concentration is avoided; the superficial gas velocity of the adsorption tower is maintained, ensuring that the actual residence time of the flue gas in the adsorption tower does not change, and avoiding the problem of incomplete adsorption caused by the reduction of the actual residence time of the adsorption tower under the condition of high inlet gas flow rate, and improving the adaptability and stability of the adsorption device to the fluctuation of the inlet gas condition. Description of the Drawings

[0040] The following will describe in detail the preferred embodiments of the present invention with the help of the drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0041] Figure 1 is a flowchart of the adsorption method carbon dioxide capture control method according to an embodiment of the present application;

[0042] Figure 2 is a structural block diagram of the adsorption method carbon dioxide capture control device according to an embodiment of the present application;

[0043] Figure 3Schematic diagram of the hardware connection relationship of the electronic device for implementing the adsorption method for carbon dioxide capture control method according to an embodiment of the present application. Detailed implementation manners

[0044] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] This embodiment provides an adsorption method for carbon dioxide capture control method, as Figure 1 shown, the method includes:

[0049] S10: Obtain the preset inlet gas flow rate, preset inlet gas pressure, cross-sectional area of the adsorption tower, preset adsorption tower operation cycle, preset inlet gas concentration, and adsorbent filling amount of the adsorption tower. Among them, the unit of the preset inlet gas flow rate is Nm 3 / h, the unit of the preset inlet gas pressure is kPaG, and the unit of the cross-sectional area is m 2 .

[0050] S20: According to the preset gas velocity calculation model, combine the preset inlet gas flow rate, the preset inlet gas pressure, and the cross-sectional area to obtain the preset superficial gas velocity of the adsorption tower. Among them, the unit of the preset superficial gas velocity is m / s.

[0051] S30: According to the preset capacity operation model, combine the preset operation cycle of the adsorption tower, the preset inlet gas flow rate, the preset inlet gas concentration, and the adsorbent filling amount to obtain the preset adsorption capacity of the adsorbent.

[0052] S40: Collect the average flue gas flow rate and the average carbon dioxide concentration in the flue gas within a set time period. Specifically, in implementation, the set time period is 1 hour - 30 days, preferably 1 - 7 days. The actual flue gas flow rate and carbon dioxide concentration can be measured by an on-line flow meter and a carbon dioxide concentration analyzer, and then the average flue gas flow rate and the average carbon dioxide concentration in the flue gas within the set time period are obtained.

[0053] S50: According to the preset pressure operation model, combine the average flue gas flow rate, the preset superficial gas velocity, and the cross-sectional area to obtain the actual inlet pressure of the adsorption tower.

[0054] S60: Obtain the carbon dioxide partial pressure value in the actual inlet gas according to the actual inlet pressure and the average carbon dioxide concentration. For example, the carbon dioxide partial pressure value = (101.325 + P) × y.

[0055] S70: Determine the actual adsorption capacity according to the carbon dioxide partial pressure relationship curve and the carbon dioxide partial pressure value; the carbon dioxide partial pressure relationship curve is a mapping relationship curve between the adsorption capacity and the carbon dioxide partial pressure value.

[0056] S80: According to the preset cycle operation model, combine the adsorbent filling amount, the actual adsorption capacity, the average flue gas flow rate, and the average carbon dioxide concentration to obtain the actual operation cycle of the adsorption tower;

[0057] S90: Control the operating state of the pressure and flow regulating equipment of the adsorption tower according to the difference value between the actual adsorption capacity and the preset adsorption capacity, so that the inlet pressure of the adsorption tower is consistent with the actual inlet pressure, and the operation cycle of the adsorption tower is consistent with the actual operation cycle.

[0058] Through the above-mentioned adsorption method carbon dioxide capture control method, the operation efficiency of the adsorption tower is improved, and the adsorption breakthrough phenomenon that may occur during the long-term operation of the adsorption tower under the conditions of high inlet gas flow rate and high CO2 concentration is avoided; the superficial gas velocity of the adsorption tower is maintained, ensuring that the actual residence time of the flue gas in the adsorption tower does not change, and avoiding the problem of incomplete adsorption caused by the reduction of the actual residence time in the adsorption tower under the condition of high inlet gas flow rate, and improving the adaptability and stability of the adsorption device to the fluctuation of the inlet gas condition.

[0059] Specifically, in some solutions, in step S20, the preset gas velocity operation model is:

[0060]

[0061] Among them, v0 represents the preset superficial gas velocity, Q0 represents the preset inlet gas flow rate, P0 represents the preset inlet gas pressure, A represents the cross-sectional area, W1, W2, and W3 are operation coefficients. W1 and W2 can be determined by empirical values. Preferably, W1 = W2 = 101.325, and W3 can be determined according to the time conversion relationship. For example, when the unit of Q0 is Nm 3 / h and the unit of the preset superficial gas velocity is m / s, W3 = 3600. Therefore, the above operation model can be expressed as:

[0062]

[0063] In specific applications, generally, the range of the preset superficial gas velocity is 0.01 - 0.8 m / s. Preferably, it should be 0.05 - 0.3 m / s. If it is not within this range, recalculation is required.

[0064] Specifically, in some solutions, in step S30, the preset capacity operation model is:

[0065]

[0066] Among them, q0 represents the preset adsorption capacity, dimensionless; T0 represents the preset operation cycle of the adsorption tower, unit s; y0 represents the preset inlet gas concentration, dimensionless; m0 represents the adsorbent filling amount, unit kg; W4 represents the operation coefficient, preferably 1.967. Then the above model can be expressed as:

[0067]

[0068] Furthermore, in step S50, the preset pressure operation model is:

[0069]

[0070] Among them, P represents the actual inlet gas pressure, unit kPaG; Q represents the average flue gas flow rate, unit Nm 3 / h; as mentioned above, W1 is preferably 101.325. Then the above model can be expressed as:

[0071]

[0072] In the above solutions, the preset cycle operation model in step S70 is:

[0073]

[0074] Among them, T represents the actual operation cycle, with the unit of s; y represents the average carbon dioxide concentration, dimensionless. According to the determination of the preferred values of W3 and W4 described above, where W3 = 3600 and W4 = 1.967, the above model can be expressed as:

[0075]

[0076] In the above embodiments of the present application, the expression formulas of various operation models are provided. In actual applications, the parameter values in each formula can be adjusted according to the application scenario. Each model in the above embodiments of the present application has been verified to be able to shorten the operation time of the adsorption tower by more than one-third, and still ensure the adsorption effect on carbon dioxide even when the working conditions fluctuate.

[0077] Further preferably, in the above step S90, the pressure and flow rate regulating device includes a booster fan and a back pressure valve; controlling the operating state of the pressure and flow rate regulating device of the adsorption tower includes: controlling the guide vane opening and motor frequency of the booster fan and controlling the opening of the back pressure valve. That is, by adjusting the booster fan in the adsorption tower and the back pressure valve behind the adsorption tower, the operation cycle is adjusted to ensure that the carbon dioxide capture scheme can operate stably at the designed empty tower gas velocity, reasonably utilize the adsorption agent capacity space, and improve the adaptability of the adsorption method carbon dioxide capture device to the fluctuation of the inlet gas condition. In the above solution, after determining each parameter, the control system of the adsorption tower can control the operation of each pressure and flow rate regulating device.

[0078] The embodiment of the present application provides an adsorption method carbon dioxide capture control device, as Figure 2 shown, including:

[0079] An information acquisition module 10, configured to acquire the preset inlet gas flow rate, preset inlet gas pressure, cross-sectional area of the adsorption tower, preset adsorption tower operation cycle, preset inlet gas concentration, and adsorbent filling amount of the adsorption tower;

[0080] A first operation module 20, configured to obtain the preset empty tower gas velocity of the adsorption tower according to the preset gas velocity operation model, in combination with the preset inlet gas flow rate, the preset inlet gas pressure, and the cross-sectional area; the preset gas velocity operation model is:

[0081]

[0082] Among them, v0 represents the preset empty tower gas velocity, Q0 represents the preset inlet gas flow rate, P0 represents the preset inlet gas pressure, A represents the cross-sectional area, and W1, W2, and W3 are operation coefficients.

[0083] The second operation module 30 is configured to obtain the preset adsorption capacity of the adsorbent according to a preset capacity operation model, in combination with the preset operation cycle of the adsorption tower, the preset intake air flow rate, the preset intake air concentration, and the adsorbent filling amount; the preset capacity operation model is:

[0084]

[0085] where q0 represents the preset adsorption capacity, T0 represents the preset operation cycle of the adsorption tower, y0 represents the preset intake air concentration, m0 represents the adsorbent filling amount, and W4 represents an operation coefficient.

[0086] The acquisition module 40 is configured to acquire the average flue gas flow rate and the average carbon dioxide concentration in the flue gas within a set time period.

[0087] The third operation module 50 is configured to obtain the actual intake air pressure of the adsorption tower according to a preset pressure operation model, in combination with the average flue gas flow rate, the preset superficial gas velocity, and the cross-sectional area; the preset pressure operation model is:

[0088]

[0089] where P represents the actual intake air pressure and Q represents the average flue gas flow rate.

[0090] The fourth operation module 60 is configured to obtain the carbon dioxide partial pressure value in the actual intake air according to the actual intake air pressure and the average carbon dioxide concentration;

[0091] The fifth operation module 70 is configured to determine the actual adsorption capacity according to the carbon dioxide partial pressure relationship curve and the carbon dioxide partial pressure value; the carbon dioxide partial pressure relationship curve is a mapping relationship curve between the adsorption capacity and the carbon dioxide partial pressure value.

[0092] The sixth operation module 80 is configured to obtain the actual operation cycle of the adsorption tower according to a preset cycle operation model, in combination with the adsorbent filling amount, the actual adsorption capacity, the average flue gas flow rate, and the average carbon dioxide concentration; the preset cycle operation model is:

[0093]

[0094] where T represents the actual operation cycle and y represents the average carbon dioxide concentration.

[0095] The adsorption control module 90 is configured to control the operating states of the pressure and flow regulating devices of the adsorption tower according to the difference value between the actual adsorption capacity and the preset adsorption capacity, so that the intake air pressure of the adsorption tower is consistent with the actual intake air pressure, and the operation cycle of the adsorption tower is consistent with the actual operation cycle.

[0096] The embodiment of the present application further provides a storage medium, in which program information is stored. After a computer reads the program information, it executes the adsorption method for carbon dioxide capture control method described in any one of the above embodiments.

[0097] The embodiment of the present application further provides an electronic device, as Figure 3 shown, including at least one processor 301 and at least one memory 302. At least one of the memories 302 stores program information, and at least one of the processors 301 reads the program information and executes the adsorption method for carbon dioxide capture control method described in any one of the solutions in Embodiment 1. Figure 3 Taking one processor 301 as an example. The electronic device may further include: an input device 303 and an output device 304. The processor 301, the memory 302, the input device 303, and the output device 304 may be connected through a bus or other means. Figure 3 Taking the connection through a bus as an example. The memory 302, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 301 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions, and modules stored in the memory 302, that is, implements the adsorption method for carbon dioxide capture control method described in any one of the above solutions. The above products can execute the method provided by the embodiment of the present application, and have corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided by the embodiment of the present application.

[0098] The embodiment of the application further provides a computer program product, including a computer program / instructions, characterized in that when the computer program / instructions are executed by a processor, the steps of the adsorption method for carbon dioxide capture control method described in any one of the above method embodiments are implemented.

[0099] The following will be described in detail with the comparison results of the carbon dioxide capture effects of specific embodiments and comparative examples.

[0100] Embodiment 1:

[0101] Obtain the preset inlet gas flow rate, preset inlet gas pressure, cross-sectional area of the adsorption tower, preset adsorption tower operation cycle, preset inlet gas concentration, and adsorbent loading amount in the adsorption tower: the preset inlet gas flow rate Q0 is 10000 Nm 3 / h, the preset inlet gas pressure P0 is 30 kPaG, the cross-sectional area A of the adsorption tower is 21.43 m 2 , the preset adsorption tower operation cycle T0 is 120 s, the preset inlet gas concentration y0 is 15%, and the adsorbent loading amount m0 is 1967 kg.

[0102] The carbon dioxide partial pressure relationship curve is a mapping relationship curve between the adsorption capacity and the carbon dioxide partial pressure value. Specifically: the mapping relationship between the adsorption capacity of the filled adsorbent and the carbon dioxide partial pressure value is as follows: when the carbon dioxide partial pressure value is in the range of 15 kPa to 75 kPa, there is a linear relationship between the two; when the carbon dioxide partial pressure value is below 15 kPa, the adsorption capacity is 5%; when the carbon dioxide partial pressure value is above 75 kPa, the adsorption capacity is 10%.

[0103] In this embodiment, after the inlet gas condition fluctuates, the average flue gas flow rate Q is 13000 Nm 3 / h, and the average carbon dioxide concentration y is 18%.

[0104] According to the preset gas velocity operation model, combining the preset inlet gas flow rate, the preset inlet gas pressure, and the cross-sectional area to obtain the preset superficial gas velocity (m / s) of the adsorption tower:

[0105]

[0106] According to the preset capacity operation model, combining the preset operation cycle of the adsorption tower, the preset inlet gas flow rate, the preset inlet gas concentration, and the adsorbent filling amount to obtain the preset adsorption capacity (dimensionless) of the adsorbent:

[0107]

[0108] After the inlet gas condition fluctuates, according to the preset pressure operation model, combining the average flue gas flow rate, the preset superficial gas velocity, and the cross-sectional area to obtain the actual inlet gas pressure (kPaG) of the adsorption tower:

[0109]

[0110] According to the actual inlet gas pressure and the average carbon dioxide concentration, the carbon dioxide partial pressure value in the actual inlet gas is obtained: (101.325 + 69.4) × 18% = 30.7 kPa;

[0111] According to the carbon dioxide partial pressure relationship curve and the carbon dioxide partial pressure value, the actual adsorption capacity q is determined to be 6.29%.

[0112] According to the preset cycle operation model, combining the adsorbent filling amount, the actual adsorption capacity, the average flue gas flow rate, and the average carbon dioxide concentration to obtain the actual operation cycle (S) of the adsorption tower:

[0113]

[0114] Control the operating state of the pressure and flow regulating equipment of the adsorption tower according to the difference value between the actual adsorption capacity and the preset adsorption capacity, so that the inlet gas flow rate of the adsorption tower is consistent with the average flue gas flow rate, the inlet pressure is consistent with the actual inlet pressure, and the operating cycle of the adsorption tower is consistent with the actual operating cycle: adjust the frequency of the booster fan before the adsorption tower and the back pressure valve after the adsorption tower, so that the inlet pressure of the adsorption tower is 69.4 kPaG, and the operating cycle of the adsorption tower is 97 s.

[0115] Through the above control, the operating cycle of the adsorption tower is reduced from the preset 120 s to the actual 97 s, improving the operating efficiency of the adsorption tower and avoiding the adsorption breakthrough phenomenon that may occur during the long-term operation of the adsorption tower under the conditions of high inlet gas flow rate and high CO2 concentration; maintaining the superficial gas velocity of the adsorption tower at 0.1 m / s to ensure that the actual residence time of the flue gas in the adsorption tower remains unchanged, and avoiding the problem of incomplete adsorption caused by the reduction of the actual residence time of the adsorption tower under the condition of high inlet gas flow rate. Combining the above control methods improves the adaptability and stability of the adsorption device to the fluctuation of the inlet gas condition.

[0116] Comparative Example 1:

[0117] The parameters obtained in Comparative Example 1 are the same as those in Example 1, except that no adjustment control is made after the inlet gas condition fluctuates, and it still operates according to the original preset inlet pressure and preset operating cycle. The average flue gas flow rate Q after the inlet gas condition fluctuates is 13000 Nm3 / h, and the average carbon dioxide concentration y is 18%. At the preset inlet pressure of 30 kPaG, the superficial gas velocity in the adsorption tower is:

[0118]

[0119] Compared with the preset superficial gas velocity of 0.1 m / s, the superficial gas velocity after the inlet gas condition fluctuates increases by 30%, which results in a 30% reduction in the residence time of the adsorption tower. Since the carbon dioxide adsorption process is a physical process and requires a certain adsorption time, a 30% reduction in the residence time of the adsorption tower will significantly reduce the adsorption capacity, increase the decarbonized gas concentration, and reduce the carbon dioxide capture rate of the system. Specifically, after the condition fluctuates, the partial pressure value of carbon dioxide in the inlet gas is:

[0120] (101.325 + 30) × 18% = 23.6385 kPa;

[0121] At this partial pressure, the adsorption capacity of the adsorbent is calculated according to the relationship between the adsorbent capacity and the carbon dioxide partial pressure to be 5.72%.

[0122] When the condition fluctuates without changing the operating cycle of the adsorption tower, the mass of carbon dioxide passing through the adsorption tower within one operating cycle is:

[0123] 13000×18%×1.967×120÷3600 = 153.4 kg;

[0124] The ratio of the mass of carbon dioxide passing through the adsorption tower to the mass of the adsorbent in one cycle is:

[0125] 153.4÷1967 = 7.8%;

[0126] The ratio of the mass of carbon dioxide passing through the adsorption tower to the mass of the adsorbent in one cycle has been higher than the adsorption capacity of the adsorbent under the inlet carbon dioxide partial pressure. Therefore, at the end of one adsorption cycle, the adsorbent in the adsorption tower has reached the adsorption saturation state, adsorption breakthrough occurs, the concentration of the decarbonized gas increases rapidly, and the carbon dioxide capture rate of the system decreases.

[0127] Through the comparison between Example 1 and Comparative Example 1, after adopting the control method described in the present invention, the adsorption device can better cope with the fluctuation of the inlet gas flow +30% superimposed on the inlet gas concentration +20% under the original designed loading adsorption amount, and the system can still stably operate for a long time to efficiently remove carbon dioxide from the raw gas, reflecting the adaptability and stability of the control method described in the present invention for the adsorption device to cope with the fluctuation of the inlet gas conditions.

[0128] Obviously, the above examples are only for clear illustration and not for limitation of the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A control method for carbon dioxide capture by adsorption, characterized in that, Including: Obtain the preset inlet gas flow rate, preset inlet gas pressure, cross-sectional area of the adsorption tower, preset adsorption tower operation cycle, preset inlet gas concentration, and adsorbent filling amount of the adsorption tower; According to the preset gas velocity calculation model, combine the preset inlet gas flow rate, the preset inlet gas pressure, and the cross-sectional area to obtain the preset empty tower gas velocity of the adsorption tower; According to the preset capacity calculation model, combine the preset adsorption tower operation cycle, the preset inlet gas flow rate, the preset inlet gas concentration, and the adsorbent filling amount to obtain the preset adsorption capacity of the adsorbent; Collect the average flue gas flow rate and the average carbon dioxide concentration in the flue gas within a set time period; According to the preset pressure calculation model, combine the average flue gas flow rate, the preset empty tower gas velocity, and the cross-sectional area to obtain the actual inlet gas pressure of the adsorption tower; Obtain the carbon dioxide partial pressure value in the actual inlet gas according to the actual inlet gas pressure and the average carbon dioxide concentration; Determine the actual adsorption capacity according to the carbon dioxide partial pressure relationship curve and the carbon dioxide partial pressure value; the carbon dioxide partial pressure relationship curve is a mapping relationship curve between the adsorption capacity and the carbon dioxide partial pressure value; According to the preset cycle calculation model, combine the adsorbent filling amount, the actual adsorption capacity, the average flue gas flow rate, and the average carbon dioxide concentration to obtain the actual operation cycle of the adsorption tower; Control the operation state of the pressure and flow regulating equipment of the adsorption tower according to the difference value between the actual adsorption capacity and the preset adsorption capacity, so that the inlet gas pressure of the adsorption tower is consistent with the actual inlet gas pressure, and the operation cycle of the adsorption tower is consistent with the actual operation cycle.

2. The adsorption method for carbon dioxide capture control method according to claim 1, wherein In the process of obtaining the preset empty tower gas velocity of the adsorption tower according to the preset gas velocity calculation model by combining the preset inlet gas flow rate, the preset inlet gas pressure, and the cross-sectional area: The preset gas velocity calculation model is: Where, v0 represents the preset empty tower gas velocity, Q0 represents the preset inlet gas flow rate, P0 represents the preset inlet gas pressure, A represents the cross-sectional area, and W1, W2, and W3 are calculation coefficients.

3. The adsorption method for carbon dioxide capture control method according to claim 2, characterized in that, In the process of obtaining the preset adsorption capacity of the adsorbent according to the preset capacity calculation model by combining the preset adsorption tower operation cycle, the preset inlet gas flow rate, the preset inlet gas concentration, and the adsorbent filling amount: The preset capacity calculation model is: Where, q0 represents the preset adsorption capacity, T0 represents the preset adsorption tower operation cycle, y0 represents the preset inlet gas concentration, m0 represents the adsorbent filling amount, and W4 represents the calculation coefficient.

4. The adsorption method for carbon dioxide capture control method according to claim 3, wherein, In the process of obtaining the actual inlet gas pressure of the adsorption tower according to the preset pressure calculation model by combining the average flue gas flow rate, the preset empty tower gas velocity, and the cross-sectional area: The preset pressure calculation model is: Where, P represents the actual inlet gas pressure, and Q represents the average flue gas flow rate.

5. The adsorption method for carbon dioxide capture control method according to claim 4, characterized in that, In the process of obtaining the actual operation cycle of the adsorption tower according to the preset cycle calculation model by combining the adsorbent filling amount, the actual adsorption capacity, the average flue gas flow rate, and the average carbon dioxide concentration: The preset cycle calculation model is: Where, T represents the actual operation cycle, and y represents the average carbon dioxide concentration.

6. The adsorption method for carbon dioxide capture control method according to any one of claims 1-5, characterized in that, Among the average flue gas flow rate and the average carbon dioxide concentration in the flue gas within the set collection time period: The set time period is from 1 hour to 30 days.

7. The adsorption method for carbon dioxide capture control method according to claim 6, characterized in that, The pressure and flow rate regulating device includes a booster fan and a back pressure valve; controlling the operating state of the pressure and flow rate regulating device of the adsorption tower includes: Controlling the vane opening degree and motor frequency of the booster fan and controlling the opening degree of the back pressure valve.

8. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by a processor, the steps of the carbon dioxide capture control method by adsorption according to any one of claims 1-7 are implemented.

9. A storage medium, characterized in that, Program information is stored in the storage medium, and after a computer reads the program information, the carbon dioxide capture control method by adsorption according to any one of claims 1-7 is executed.

10. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory. Program information is stored in at least one of the memories, and after at least one of the processors reads the program information, the carbon dioxide capture control method by adsorption according to any one of claims 1-7 is executed.

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