CN115382376A

CN115382376A - Method and system for applying tail gas subjected to ammonia desulphurization and decarbonization to plant factory

Info

Publication number: CN115382376A
Application number: CN202211197396.4A
Authority: CN
Inventors: 张军; 王金勇; 祁丽昉; 罗静
Original assignee: Jiangnan Environmental Protection Group Co ltd; Jiangsu New Century Jiangnan Environmental Protection Co ltd
Current assignee: Jiangnan Environmental Protection Group Co ltd; Jiangsu New Century Jiangnan Environmental Protection Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2022-11-25

Abstract

The application provides a method and a system for applying tail gas obtained after ammonia desulphurization and decarbonization to a plant factory. The method comprises the following steps: carrying out ammonia desulphurization and decarbonization treatment on the flue gas to obtain tail gas; the tail gas is fed into a planting system of the plant to adjust an operating parameter of the plant, the operating parameter including one or more of carbon dioxide concentration, air humidity, and air temperature. The method utilizes the tail gas to supplement carbon dioxide required by photosynthesis for plants of the planting system, simultaneously supplements air humidity for the planting system, can supplement heat for the planting system when the temperature of the tail gas is higher than the ambient temperature, and simultaneously can utilize condensed water in the tail gas for plant growth. Therefore, the method realizes the full utilization of carbon dioxide, moisture and waste heat in the tail gas, achieves the aim of low-cost regulation and control of the concentration of the carbon dioxide and/or the air humidity and/or the temperature of the planting system, promotes the large-scale popularization and application of plant factories, and ensures the national food safety.

Description

Method and system for applying tail gas subjected to ammonia desulphurization and decarbonization to plant factory

Technical Field

The application relates to the field of environmental protection, in particular to a method and a system for applying tail gas obtained after ammonia desulphurization and decarbonization to a plant factory.

Background

At present, a plurality of methods for removing sulfur dioxide in industrial gas are available, wherein the ammonia desulfurization process does not generate waste water and waste residue, and the input desulfurizer ammonia can be converted into ammonium sulfate fertilizer, so that waste is changed into valuable, and the method is concerned. The by-product ammonium sulfate fertilizer can be used as nitrogen fertilizer and sulfur fertilizer to promote plant growth.

Ammonia has strong CO simultaneously ₂ The ammonia decarburization technology is favored by researchers because of weak absorption capacity, low corrosiveness and moderate price. The ammonia method carbon capture technology can remove carbon dioxide and simultaneously can produce ammonium bicarbonate fertilizer as a byproduct, thereby not only omitting CO ₂ The regeneration process shortens the carbon capture process flow, greatly reduces the investment and the operation cost, can replace high-nitrogen urea mainly used in China, reduces the use cost of chemical fertilizers, and improves the grain-planting enthusiasm of farmers; meanwhile, the problems of low nitrogen utilization rate and water and atmospheric pollution caused by nitrogen loss in the use process of high-nitrogen urea can be solved, and the green transformation of the nitrogen fertilizer industry in China can be realized.

The Chinese patent application with the application number of 201710865004.X discloses a method for applying an ultra-clean ammonia desulphurization technology to a carbon capture process, and the method is characterized in that flue gas subjected to ultra-clean ammonia desulphurization is directly sent to a carbon capture device for subsequent treatment, so that integration of ultra-clean emission, desulphurization and decarbonization is realized, and the investment and the operation cost of carbon capture can be greatly reduced. The ultra-clean desulfurization and dust removal are realized by controlling the components of the graded solution and the reaction conditionsDesulfurization outlet SO ₂ The content can be reduced to less than or equal to 1ppm, and the dust content is less than or equal to 2mg/Nm ³ Ammonia escape less than or equal to 1mg/Nm ³ And the subsequent carbon capture device is used for capturing carbon dioxide to realize ultra-clean emission. The process directly accesses carbon capture after ammonia desulphurization to realize desulphurization and decarburization. The tail gas after ammonia desulphurization and decarbonization meets the emission requirement, but the decarbonized gas still has certain CO ₂ Concentration, saturation humidity and temperature of CO therein ₂ And the saturated water and the waste heat are directly discharged to the atmosphere, so that resource waste is caused.

The Chinese patent application with the application number of 201710399322.1 discloses a method and a system for utilizing energy and carbon dioxide of a thermal power plant based on a plant factory, wherein the method is to build the plant factory nearby the thermal power plant, and low-quality heat of the thermal power plant, such as hot water or steam, is adopted to supply heat to the plant factory, or a refrigerator is driven by the steam to generate refrigerant water to cool the plant factory; carbon dioxide in the flue gas of the thermal power plant is introduced into the plant factory as an air fertilizer to be absorbed and utilized; the thermal power plant can also directly supply power to the plant factory light supplement system. According to the process, low-quality heat of a thermal power plant is used for supplying heat or cooling for a plant factory, carbon dioxide obtained by carbon capture and regeneration of desulfurized flue gas is introduced into the plant factory as an air fertilizer to be absorbed and utilized, and tail gas obtained by carbon capture is not utilized.

The Chinese patent application with the application number of 202110547361.8 discloses CO discharged by a coal-fired unit ₂ The method comprises the steps of extracting partial smoke in a flue at the tail part of a coal-fired unit by using an induced draft fan, introducing the smoke into an active carbon heavy metal removal device for heavy metal removal treatment, introducing the treated smoke into an ammonia desulphurization device for acid gas removal treatment, introducing the purified smoke into a plant greenhouse through an outlet flue, a gas fertilizer main pipe and a gas fertilizer branch pipe, and observing CO in the plant greenhouse ₂ A concentration monitoring device and the growth condition of plants, and the proper CO in the plant greenhouse is achieved by adjusting a flow regulating valve on the gas fertilizer branch pipe ₂ And (4) concentration. The process only utilizes CO in the desulfurized flue gas ₂ Heat and moisture are not utilized therein; the tail gas is not decarbonizedThe carbon dioxide content in the tail gas is high, the utilization rate of carbon in the flue gas by a plant factory is low, and the problem of carbon emission still exists.

Disclosure of Invention

The application provides a method and a system for applying tail gas obtained after ammonia desulphurization and decarbonization to a plant factory, so as to solve the problem that carbon dioxide in the flue gas cannot be effectively utilized.

The first aspect of the application provides a method for applying tail gas after ammonia desulphurization and decarbonization to a plant factory, which comprises the following steps: carrying out ammonia desulphurization and decarbonization treatment on the flue gas to obtain tail gas; the tail gas is fed into a planting system of the plant to adjust an operating parameter of the plant, the operating parameter including one or more of carbon dioxide concentration, air humidity, and air temperature.

Further, the target carbon dioxide concentration of the planting system is 500-2500 ppm, preferably 700-1500 ppm; and/or the target air temperature of the planting system is 10-40 ℃, preferably 18-30 ℃; and/or the target air humidity of the planting system is 20 to 80%, preferably 50 to 75%.

Further, the method for applying the tail gas subjected to ammonia desulphurization and decarbonization to the plant factory further comprises the following steps: the adjustment mode 1) is used for adjusting the feeding amount of the tail gas to the planting system according to the difference value between the real-time carbon dioxide concentration and the target carbon dioxide concentration of the planting system; and/or an adjusting mode 2) adjusting the feeding amount of the tail gas to the planting system according to the difference value of the real-time air humidity and the target air humidity of the planting system; and/or adjusting mode 3), adjusting the feeding amount of the tail gas into the planting system according to the difference value between the real-time air temperature of the planting system and the target air temperature and humidity.

Further, when the feed amount of the adjustment method 1), the feed amount of the adjustment method 2), and the feed amount of the adjustment method 3) are different at the same time, the adjustment method 1) is preferentially performed, and then the adjustment method 2) is performed.

Further, the method for applying the tail gas subjected to ammonia desulphurization and decarbonization to the plant factory further comprises the following steps: at least part of the tail gas is subjected to indirect heat exchange with the planting system.

Further, the method for applying the tail gas subjected to ammonia desulphurization and decarbonization to the plant factory further comprises an adjustment mode 4): and adjusting the flow of the tail gas exchanging heat with the planting system according to the difference value between the real-time air temperature and the target air temperature of the planting system.

Further, when the feed amount of the adjustment mode 1), the feed amount of the adjustment mode 2), and the feed amount of the adjustment mode 3) are different at the same time, the adjustment mode 1) and the adjustment mode 4) are preferably performed at the same time, and then the adjustment mode 2) is performed.

Further, the tail gas generates first condensed water after indirectly exchanging heat with the planting system, and/or the tail gas generates second condensed water when being sent into the planting system.

Further, the method for using the tail gas after desulfurization and decarburization by the ammonia process in the plant factory also comprises the step of sending the first condensed water and/or the second condensed water into the planting system as at least a part of water source of the planting system.

Further, the ammonia desulfurization and decarburization treatment comprises the following steps: carrying out ammonia desulphurization treatment on the flue gas to obtain desulfurized flue gas; and carrying out ammonia decarburization treatment on the desulfurized flue gas to obtain tail gas.

Furthermore, the concentration of sulfur dioxide in the desulfurized flue gas is less than or equal to 50mg/Nm ³ Preferably ≤ 35mg/Nm ³ (ii) a And/or the dust concentration in the desulfurized flue gas is less than or equal to 10mg/Nm ³ Preferably ≤ 5mg/Nm ³ (ii) a And/or ammonia escape is less than or equal to 8mg/Nm in the ammonia desulphurization process ³ Preferably ≤ 3mg/Nm ³ (ii) a And/or the concentration of sulfur dioxide in the tail gas is less than or equal to 20mg/Nm ³ Preferably ≤ 10mg/Nm ³ (ii) a And/or the volume content of carbon dioxide in the tail gas is 0.5-10%, preferably 1-6%; and/or the dust concentration in the tail gas is less than or equal to 5mg/Nm ³ Preferably ≤ 3mg/Nm ³ (ii) a And/or the temperature of the tail gas is 10-60 ℃, preferably 15-50 ℃; and/or ammonia escape is less than or equal to 5mg/Nm in the ammonia process decarburization process ³ Preferably ≤ 3mg/Nm ³ 。

Further, the method for using the tail gas after ammonia desulphurization and decarbonization in the plant factory further comprises the step of adjusting the decarbonization efficiency of the ammonia decarbonization process according to the difference value between the real-time carbon dioxide concentration and the target carbon dioxide concentration of the planting system, and the method for adjusting the decarbonization efficiency of the ammonia decarbonization process comprises the step of adjusting the ammonia supply amount of the ammonia decarbonization process.

Further, the decarburization efficiency of the ammonia process decarburization is 20 to 98%.

Further, the ammonia desulfurization treatment also produces ammonium sulfate salts, including ammonium sulfate and/or ammonium bisulfate; the ammonia decarburization treatment also produces ammonium bicarbonate salt, the ammonium bicarbonate salt comprises ammonium carbonate and/or ammonium bicarbonate, and the method for using the tail gas after ammonia desulfurization and decarburization for the plant factory further comprises the following steps: the ammonium sulfate salt and/or ammonium bicarbonate salt is fed into a plant factory to be used as a nutrient solution for plant growth.

Further, the planting system adopts nutrient solution to provide nutrient elements for plants, and the method for applying tail gas obtained after ammonia desulphurization and decarburization to a plant factory further comprises the following steps: and adjusting the feeding amount of the ammonium sulfate salt and/or the ammonium bicarbonate salt into the planting system in real time according to the difference value between the real-time nutrient element concentration value and the target nutrient element concentration value in the nutrient solution, wherein the nutrient element concentration value comprises a sulfur element concentration value, a nitrogen element concentration value and/or a carbon element concentration value.

According to another aspect of the present application, there is provided a system for a plant factory based on tail gas after ammonia desulfurization and decarbonization, comprising: the ammonia desulphurization and decarbonization device is used for desulphurization and decarbonization of flue gas and comprises a tail gas outlet; the plant factory, plant factory includes planting system, and the tail gas export is connected with planting system in order to provide tail gas to planting system.

Further, the tail gas outlet is connected with the planting system through a first induced draft fan.

Further, the plant factory further comprises: the monitoring system comprises a carbon dioxide concentration monitor for monitoring the concentration of carbon dioxide in the planting system, a humidity detector for monitoring the air humidity of the planting system and/or a temperature detector for monitoring the air temperature in the planting system; the control system comprises a carbon dioxide concentration control unit, a humidity control unit and/or a humidity control unit; the carbon dioxide concentration control unit is respectively connected with the carbon dioxide concentration monitor and the first induced draft fan and is used for receiving the carbon dioxide concentration value monitored by the carbon dioxide concentration monitor and sending a first instruction for regulating and controlling air volume to the first induced draft fan according to the carbon dioxide concentration value; and/or the humidity control unit is respectively connected with the humidity monitor and the first induced draft fan and is used for receiving the humidity value of the humidity monitor and sending a second instruction for regulating and controlling the air volume to the first induced draft fan according to the humidity value; and/or the temperature control unit is respectively connected with the temperature monitor and the first induced draft fan and is used for receiving the temperature value of the temperature monitor and sending a third instruction for regulating and controlling the air volume to the first induced draft fan according to the temperature value.

Furthermore, the control system further comprises a judging unit, wherein the judging unit is respectively connected with the carbon dioxide concentration control unit, the temperature control unit and the humidity control unit and is used for sending a final instruction for preferentially executing the first instruction and then executing the second instruction to the carbon dioxide concentration control unit, the temperature control unit and the humidity control unit when the first instruction, the second instruction and the third instruction are different in time.

Further, each of the plant factories further includes: and the tail gas outlet is connected with the heat exchange system through a second induced draft fan so as to provide a heat exchange medium for the heat exchange system.

Furthermore, the temperature control unit is connected with the temperature monitor and the second induced draft fan respectively, and is used for receiving the temperature value of the temperature monitor and sending a fourth instruction for regulating and controlling the air volume to the second induced draft fan according to the temperature value.

Furthermore, the control system further comprises a judging unit, wherein the judging unit is respectively connected with the carbon dioxide concentration control unit, the temperature control unit and the humidity control unit and is used for sending a final instruction for preferentially executing the first instruction and the fourth instruction simultaneously and then executing the second instruction to the carbon dioxide concentration control unit, the temperature control unit and the humidity control unit when the first instruction, the second instruction and the third instruction are not the same at the same time.

Further, the heat exchange system also comprises a first condensate water collecting device; and/or the tail gas outlet is connected with the planting system through a flue so as to provide tail gas for the planting system, the first induced draft fan is arranged on the flue, and the second condensed water collecting device is arranged at the lowest position of the flue so as to collect condensed water in the flue.

Furthermore, the planting system is also provided with water supply equipment for supplying water to plants, and the first condensed water collecting equipment and/or the second condensed water collecting equipment are/is connected with the water supply equipment.

Further, the ammonia desulfurization and decarburization device comprises: the ammonia desulphurization unit comprises a desulphurization flue gas outlet; the ammonia process decarbonization unit comprises ammonia supply equipment, a desulfurization flue gas inlet and a tail gas outlet, and the desulfurization flue gas outlet is connected with the desulfurization flue gas inlet.

Further, the carbon dioxide concentration control unit is connected to the carbon dioxide concentration monitor and the ammonia supply device, respectively, and is configured to receive the carbon dioxide concentration value monitored by the carbon dioxide concentration monitor and send an instruction for regulating and controlling the supply amount of ammonia gas to the ammonia supply device according to the carbon dioxide concentration value.

Further, above-mentioned ammonia process desulfurization unit still has the ammonium sulfate export, and ammonia process decarbonization unit still has the ammonium bicarbonate export, and plant factory still includes the nutrient solution system, and the nutrient solution system includes: the device comprises a nutrient solution supply unit, a sulfate salt outlet and a carbonate salt outlet are respectively connected with the nutrient solution supply unit through pipelines, liquid pumps and/or flow regulating valves are arranged on the pipelines, and the nutrient solution outlet of the nutrient solution supply unit is connected with the same as the planting; the monitoring system also comprises a nutrient solution concentration monitor; the control system also comprises a nutrient solution control unit which is respectively connected with the liquid pump and/or the flow regulating valve and the nutrient solution concentration monitor so as to receive the nutrient element concentration value of the nutrient solution concentration monitor and send a flow regulating and controlling instruction to the liquid pump and/or the flow regulating valve according to the nutrient element concentration value.

According to the method, the tail gas generated by desulfurization and decarburization is introduced into the planting system of the plant factory, so that carbon dioxide required by photosynthesis is supplemented for plants in the planting system, meanwhile, the tail gas has high humidity, so that air humidity can be supplemented for the planting system, and when the temperature of the tail gas is higher than the ambient temperature, heat can be supplemented for the planting system, so that the growth of the plants is promoted. Therefore, the method for using the tail gas subjected to ammonia desulphurization and decarbonization in the plant factory realizes full utilization of carbon dioxide, moisture and waste heat in the tail gas, and achieves low-cost regulation and control of the carbon dioxide concentration, and/or air humidity and/or air temperature of the planting system by introducing the tail gas into the planting system.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a flow chart illustrating a method for applying tail gas to a plant after desulfurization and decarbonization based on an ammonia process according to an exemplary embodiment of the present application.

FIG. 2 is a flow chart illustrating a method for applying tail gas to a plant after desulfurization and decarbonization based on an ammonia process according to an embodiment of the present application.

FIG. 3 is a block diagram illustrating a system for applying tail gas to a plant based on desulfurization and decarbonization by ammonia process according to an exemplary embodiment of the present application.

FIG. 4 is a block diagram illustrating a system for applying tail gas to a plant factory after desulfurization and decarbonization based on an ammonia process according to an embodiment of the present application.

Fig. 5 is a schematic diagram illustrating the structure of an ammonia desulfurization tower and an ammonia decarbonization tower used in a plant factory system based on tail gas after ammonia desulfurization and decarbonization according to an embodiment of the application.

FIG. 6 is a schematic diagram of a plant system configured to utilize the decarbonized tail gas from ammonia desulfurization according to an embodiment of the present disclosure.

In the drawings, the drawings are not necessarily to scale.

Description of the reference numerals:

the ammonia desulphurization and decarbonization device 1, the ammonia desulphurization unit 11, the desulphurization and concentration section 111, the desulphurization and absorption section 112, the particulate matter control section 113, the oxidation circulation tank 114, the concentration circulation pump 115, the desulphurization and absorption circulation pump I116, the desulphurization and absorption circulation pump II 117, the particulate matter control circulation pump 118 and the ammonium sulfate discharge pump 119;

an ammonia decarburization unit 12, a decarburization cooling section 121, a decarburization absorption section 122, an ammonia escape control section 123, a decarburization cooling circulating pump 124, a decarburization absorption circulating pump 125, an ammonia escape control circulating pump 126, an ammonium bicarbonate discharge pump 127 and a cooling heat exchanger 128;

the system comprises a plant factory 2, a planting system 21, a monitoring system 22, a control system 23, a heat exchange system 24 and a nutrient solution system 25;

the first induced draft fan 01 and the second induced draft fan 02.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

It should be understood by those skilled in the art that the terms "first" and "second" as used herein do not denote any order; in addition, the "connection" in the present application may be a pipeline connection, an electrical connection or a signal connection, and a person skilled in the art may select a corresponding connection manner according to a specific application scenario.

As analyzed by the background art of the application, the flue gas containing carbon dioxide in the prior art can not be fully and effectively utilized, so that the carbon dioxide is not fully utilized. In order to solve the problem, the application provides a method and a system for applying tail gas after ammonia desulphurization and decarbonization to a plant factory.

In an exemplary embodiment of the present application, a method for applying the tail gas after desulfurization and decarbonization based on ammonia process to a plant is provided, as shown in fig. 1, and the method for applying the tail gas after desulfurization and decarbonization based on ammonia process to the plant comprises: carrying out ammonia desulphurization and decarbonization treatment on the flue gas to obtain tail gas; the tail gas is fed into a planting system of the plant to adjust an operating parameter of the plant, the operating parameter including one or more of carbon dioxide concentration, air humidity, and air temperature.

According to the method, the tail gas generated by desulfurization and decarburization is introduced into the planting system of the plant factory, so that carbon dioxide required by photosynthesis is supplemented for plants in the planting system, meanwhile, the humidity of the tail gas is high, so that air humidity can be supplemented for the planting system, and when the temperature of the tail gas is higher than the ambient temperature, heat can be supplemented for the planting system, so that the growth of the plants is promoted. Therefore, the method for using the tail gas subjected to ammonia desulphurization and decarbonization in the plant factory realizes full utilization of carbon dioxide, moisture and waste heat in the tail gas, and achieves low-cost regulation and control of the carbon dioxide concentration, and/or air humidity and/or air temperature of the planting system by introducing the tail gas into the planting system.

In some embodiments, to increase the growth efficiency of the plants, it is preferred that the target carbon dioxide concentration of the planting system is from 500 to 2500ppm, preferably from 700 to 1500ppm; and/or the target air temperature of the planting system is 10-40 ℃, preferably 18-30 ℃; and/or the target air humidity of the planting system is 20 to 80%, preferably 50 to 75%.

In some embodiments, the method for using the tail gas after ammonia desulfurization and decarbonization in the plant factory further comprises: the adjustment mode 1) is used for adjusting the feeding amount of the tail gas to the planting system according to the difference value between the real-time carbon dioxide concentration and the target carbon dioxide concentration of the planting system; and/or an adjusting mode 2) adjusting the feeding amount of the tail gas to the planting system according to the difference value of the real-time air humidity and the target air humidity of the planting system; and/or adjusting mode 3) adjusting the feeding amount of the tail gas to the planting system according to the difference value between the real-time air temperature and the target air temperature of the planting system. Through the adjustment of the above embodiment, the adjustment mode 1) reduces the feeding amount of the tail gas to the planting system when the real-time carbon dioxide concentration is higher than the target carbon dioxide concentration, and conversely increases the feeding amount to the planting system. The adjusting mode 2) reduces the feeding amount of the tail gas to the planting system when the real-time air humidity is higher than the target air humidity, and otherwise, increases the feeding amount to the planting system. Adjustment mode 3) when real-time air temperature is higher than target air temperature, reduce the volume of sending into of tail gas to planting the system, otherwise increase the volume of sending into planting the system (this adjustment mode takes tail gas temperature higher than ambient temperature as the prerequisite, if do not have special explanation, this application all assumes that tail gas temperature is higher than ambient temperature). The real-time monitoring result can be collected at a set time interval, for example, the carbon dioxide concentration, the temperature and the humidity of the planting system are detected once per hour to obtain a real-time carbon dioxide concentration value, a real-time air temperature and a real-time air humidity.

Since the exhaust gas, when introduced into the planting system, affects the carbon dioxide concentration, the temperature and the air humidity of the planting system at the same time, and the carbon dioxide concentration, the temperature and the air humidity are not uniform with each other, the difference between the input amount of the adjustment mode 1), the input amount of the adjustment mode 2) and the input amount of the adjustment mode 3) at the same time causes problems in the implementation of the adjustment mode, in some embodiments, wherein the adjustment mode 1) comprises increasing the input amount by a value T1 and decreasing the input amount by a value T2, the adjustment mode 2) comprises increasing the input amount by a value T3 and decreasing the input amount by a value T4, and the adjustment mode 3) comprises increasing the input amount by a value T5 and decreasing the input amount by a value T6, the above-mentioned differences include that the adjustment of increasing the feed amount by a value T1 and decreasing the feed amount by a value T4 is simultaneously carried out, the adjustment of increasing the feed amount by a value T1 and decreasing the feed amount by a value T6 is simultaneously carried out, the adjustment of decreasing the feed amount by a value T2 and increasing the feed amount by a value T3 is simultaneously carried out, the adjustment of decreasing the feed amount by a value T2 and increasing the feed amount by a value T5 is simultaneously carried out, the adjustment of increasing the feed amount by a value T1 and increasing the feed amount by a value T3 is simultaneously carried out and T1. Noteq.T 3, the adjustment of increasing the feed amount by a value T1 and increasing the feed amount by a value T5 is simultaneously carried out and T1. Noteq.T 5, the adjustment of increasing the feed amount by a value T3 and increasing the feed amount by a value T5 is simultaneously carried out and T3. Noteq.T 5, the adjustment of decreasing the feed amount by a value T2 and decreasing the feed amount by a value T4 and decreasing the feed amount by a value T6 and T6 is simultaneously carried out and decreasing the feed amount, t1, T2, T3, T4, T5 and T6 are each independently greater than or equal to 0.

In order to solve the problem caused by the difference between the feed amount of the adjustment method 1), the feed amount of the adjustment method 2), and the feed amount of the adjustment method 3), in some embodiments, the adjustment method 1) is performed preferentially, and then the adjustment method 2) is performed. Namely, the regulation and control of the carbon dioxide concentration of the planting system is taken as a primary task, and the regulation and control of the air humidity of the planting system is taken as a secondary task. And finally, determining whether to execute the adjustment mode 3) according to the needs, for example, after the air temperature is adjusted by adopting the temperature adjusting equipment configured by the planting system, the adjustment mode 3) is not needed.

In some embodiments, as shown in fig. 2, the method for using the tail gas after desulfurization and decarbonization based on the ammonia process in the plant factory further comprises: so that at least part of the tail gas is subjected to indirect heat exchange with the planting system. Besides the tail gas is sent into the planting system to realize direct heat exchange with the planting system, the tail gas is sent into the heat exchange system to be used as a heat exchange medium to carry out indirect heat exchange with the planting system, so that the temperature adjustment of the planting system can be realized, the adjustment does not influence the carbon dioxide concentration of the planting system, and the mode realizes the utilization of the waste heat of the tail gas.

Certainly, after heat exchange, if necessary, the tail gas after heat exchange can be sent to a planting system for further utilization, for example, a plurality of plant factories or a plurality of plant factories have a plurality of planting systems, then a part of the tail gas is sent to the heat exchange system of one plant factory needing heat exchange, or sent to the heat exchange system corresponding to one planting system needing heat exchange to cool the tail gas, and then the cooled tail gas is sent to the planting system of another plant factory needing carbon dioxide supplement or the planting system needing carbon dioxide supplement in the same plant factory.

In order to adjust the temperature of the planting system more accurately and timely by using the tail gas, in some embodiments, the method for using the tail gas after ammonia desulphurization and decarbonization for the plant factory further comprises an adjusting mode 4): and adjusting the flow of the tail gas exchanging heat with the planting system according to the difference value between the real-time air temperature and the target air temperature of the planting system. Through the embodiment, when the real-time air temperature value is lower than the target air temperature, the flow of the tail gas indirectly exchanging heat with the planting system is increased, so that the heat transfer efficiency of the tail gas to the planting system is improved, the temperature of the planting system is improved, and the growth of plants is promoted; otherwise, the flow of the tail gas which indirectly exchanges heat with the planting system is reduced, so that excessive heat brought by the tail gas is avoided, and the planting system is cooled.

In some embodiments, when the feed amount of the adjustment method 1), the feed amount of the adjustment method 2), and the feed amount of the adjustment method 3) are different at the same time, it is preferable to simultaneously perform the adjustment method 1) and the adjustment method 4), and then perform the adjustment method 2). The meaning of "the feed amount of the adjustment mode 1), the feed amount of the adjustment mode 2), and the feed amount of the adjustment mode 3) are different at the same time" in this embodiment is the same as that of "the feed amount of the adjustment mode 1), the feed amount of the adjustment mode 2), and the feed amount of the adjustment mode 3) are different at the same time" in the foregoing embodiment, and will not be described again. The above embodiment is based on that the tail gas can be independently used as an indirect heat exchange medium to individually adjust the temperature of the planting system, so that when the above adjustment mode 1), the adjustment mode 2) and the adjustment mode 3) are different, the adjustment mode 1) and the adjustment mode 4) can be simultaneously performed, and the simultaneous adjustment of the carbon dioxide concentration and the air temperature is realized.

After the tail gas is cooled, saturated water vapor in the tail gas is condensed to form condensed water, in some embodiments, the tail gas generates first condensed water after indirect heat exchange with the planting system, and/or the tail gas generates second condensed water when being sent into the planting system.

In order to reduce the recycling cost of the condensed water, in some embodiments, the method for using the tail gas after ammonia desulphurization and decarbonization in the plant factory further comprises sending the first condensed water and/or the second condensed water to the planting system as at least a part of a water source of the planting system. Namely, the condensed water is used as water for plant growth, so that the condensed water can be reused in a short distance.

In some embodiments, as shown in fig. 2, the ammonia desulfurization and decarbonization treatment includes: carrying out ammonia desulphurization treatment on the flue gas to obtain desulfurized flue gas; and carrying out ammonia decarburization treatment on the desulfurized flue gas to obtain tail gas. The flue gas is firstly desulfurized by an ammonia method and then decarbonized by the ammonia method, so that the full desulfurization and decarbonization are realized, and the utilization efficiency of ammonia is improved.

The concentration of sulfur dioxide in the obtained desulfurization flue gas is less than or equal to 50mg/Nm by adjusting the method conditions of ammonia desulfurization treatment ³ Preferably ≤ 35mg/Nm ³ (ii) a And/or the dust concentration in the desulfurized flue gas is less than or equal to 10mg/Nm ³ Preferably ≤ 5mg/Nm ³ (ii) a And/or ammonia escape is less than or equal to 8mg/Nm in the ammonia desulphurization process ³ Preferably ≤ 3mg/Nm ³ . The specific ammonia desulfurization treatment conditions can refer to the prior art, and are not described in detail in the application.

The sulfur dioxide concentration in the obtained tail gas is less than or equal to 20mg/Nm by adjusting the method conditions of the ammonia decarburization treatment ³ Preferably ≤ 10mg/Nm ³ (ii) a And/or the dust concentration is less than or equal to 5mg/Nm ³ Preferably ≤ 3mg/Nm ³ (ii) a And/or the volume content of carbon dioxide is 0.5-10%, preferably 1-6%; and/or the temperature of the tail gas is 10-60 ℃, preferably 15-50 ℃; and/or controlling the ammonia escape to be less than or equal to 5mg/Nm in the ammonia decarburization process ³ Preferably ≤ 3mg/Nm ³ . The specific ammonia decarburization conditions can be found in the prior art, and are not described in detail in this application. Wherein the concentration of sulfur oxides (mainly the concentration of sulfur dioxide), the concentration of carbon oxides (mainly the concentration of carbon dioxide) and the concentration of dust in the tail gas are all lower than the corresponding concentrations in the desulfurization tail gas.

The parameters are obtained by a component monitor arranged at the tail part of the desulfurization flue and the tail part of the decarburization flue.

In some embodiments, the method for using the tail gas after ammonia desulphurization and decarbonization in the plant factory further comprises adjusting the decarbonization efficiency of the ammonia decarbonization treatment according to the difference between the real-time carbon dioxide concentration and the target carbon dioxide concentration of the planting system. The decarburization efficiency of the ammonia decarburization process is related to the ammonia supply amount, the operating temperature, the operating pressure, the number of cycles and the circulation rate of the absorption liquid, and the like, and thus the decarburization efficiency can be controlled by adjusting the ammonia supply amount, the operating temperature, the operating pressure, the number of cycles and the circulation rate of the absorption liquid, and in some embodiments, the decarburization efficiency of the ammonia decarburization process is adjusted by adjusting the ammonia supply amount of the ammonia decarburization process. The decarburization efficiency of the ammonia decarburization is controlled, the decarburization operation cost is saved, and for example, the decarburization efficiency of the ammonia decarburization is controlled to be changed between 20 and 98 percent. Specifically, when the carbon dioxide concentration value is lower than the target concentration, the supply amount of ammonia gas is reduced to reduce the decarburization efficiency and increase the content of carbon dioxide in the tail gas, so that the plant needs are met, and the plant growth is promoted; otherwise, the supply amount of ammonia gas is increased to increase the decarburization efficiency and reduce the content of carbon dioxide in the tail gas, so as to avoid the greenhouse effect caused by emptying excessive carbon dioxide which cannot be utilized by plants.

Still produce the ammonium sulfate salt in ammonia process desulfurization treatment process, this ammonium sulfate salt includes ammonium sulfate and/or ammonium bisulfate, still produce the ammonium bicarbonate salt in ammonia process decarbonization treatment, this ammonium bicarbonate salt includes ammonium carbonate and/or ammonium bicarbonate, and exists with the solution form, and its concentration can be adjusted according to the decarbonization technology, and its concrete adjustment mode is prior art, and no longer describes herein. In some embodiments, as shown in fig. 2, the method for using the tail gas after desulfurization and decarbonization based on the ammonia process in the plant factory further comprises: and (3) delivering the ammonium sulfate salt and/or the ammonium bicarbonate salt into the planting system to be used as a nutrient solution for plant growth. Realizes the low-cost effective utilization of the by-products of ammonia desulphurization and decarbonization.

In order to improve the accurate supply of nutrient elements, in some embodiments, the planting system uses a nutrient solution to provide the nutrient elements for the plants, and the method for using the tail gas after ammonia desulphurization and decarbonization in the plant factory further comprises: and adjusting the feeding amount of the ammonium sulfate salt and/or the ammonium bicarbonate salt into the planting system in real time according to the difference value between the real-time concentration value of the nutrient elements in the nutrient solution and the target concentration value of the nutrient elements, wherein the concentration values of the nutrient elements comprise the concentration value of sulfur elements, the concentration value of nitrogen elements and/or the concentration value of carbon elements.

In addition, the method for applying the tail gas to the plant factory after ammonia desulphurization and decarbonization also comprises the step of adjusting the illumination intensity in the plant growth process so as to meet the plant growth needs of different stages and/or different life habits.

In order to facilitate the above-mentioned method for those skilled in the art, in another exemplary embodiment of the present application, there is provided a system for applying the decarbonized tail gas based on ammonia desulfurization to a plant factory, as shown in fig. 3, the system for applying the decarbonized tail gas based on ammonia desulfurization to a plant factory includes: the device comprises an ammonia desulphurization and decarbonization device 1 and a plant factory 2, wherein the ammonia desulphurization and decarbonization device 1 comprises a tail gas outlet; the plant factory 2 comprises a planting system 21 and the off-gas outlet is connected to the planting system 21 for providing off-gas to the planting system 21.

The system can be used for implementing the method of the application, wherein the flue gas is treated by the ammonia desulphurization and decarbonization device 1, the treated tail gas is introduced into the planting system 21 of the plant factory 2, so that carbon dioxide required by photosynthesis of plants in the planting system 21 is supplemented, meanwhile, the humidity of the tail gas is high, so that air humidity can be supplemented for the planting system 21, and when the temperature of the tail gas is higher than the ambient temperature, heat can be supplemented for the planting system 21, so that the growth of the plants is promoted. It can be seen that the flue gas treatment system of the application realizes the full use of carbon dioxide, moisture and waste heat in the tail gas, and the tail gas is introduced into the planting system 21 to achieve the low-cost regulation and control of the carbon dioxide concentration, and/or the air humidity and/or the air temperature of the planting system 21.

The plant factory 2 of the present application is a conventional plant factory model in the field, such as a greenhouse, a container type planting factory, etc., and the planting system 21 may be a conventional planting system of a plant factory in the field, such as a multi-layer three-dimensional planting system. When there are a plurality of plant factories 2, the plant factories 2 are relatively independent from each other, and the structure, composition, and planting pattern may be the same or different, but the embodiments of the present application are applicable to each plant factory 2.

In some embodiments of the present application, in order to facilitate flexible adjustment of the amount of the exhaust introduced into the planting system 21, as shown in fig. 4, the exhaust outlet is connected to the planting system 21 through a first induced draft fan 01. The adjustment of the tail gas introduction amount can be realized by adjusting the air volume of the first induced draft fan 01.

In some embodiments of the present application, as shown in fig. 4, each of the plant factories 2 further includes a monitoring system 22 and a control system 23, the monitoring system 22 includes a carbon dioxide concentration monitor for monitoring a carbon dioxide concentration in the planting system 21, an air humidity detector for monitoring an air humidity of the planting system 21, and/or a temperature detector for monitoring an air temperature of the planting system 21; the control system 23 includes a carbon dioxide concentration control unit, a humidity control unit, and/or a temperature control unit. So as to adjust the carbon dioxide concentration, the air temperature and the air humidity of the planting system 21 in time, thereby meeting the growth requirements of plants in different growth stages or different plants and better promoting the growth of the plants. In some embodiments, the monitoring system 22 is configured to periodically detect the carbon dioxide concentration, the air humidity, and the air temperature of the planting system 21 at regular intervals, such as monitoring once an hour to obtain corresponding carbon dioxide concentration, temperature, and humidity values.

In some embodiments, the carbon dioxide concentration control unit is connected to the carbon dioxide concentration monitor and the first induced draft fan 01, and is configured to receive the carbon dioxide concentration value monitored by the carbon dioxide concentration monitor and send a first instruction for controlling the air volume to the first induced draft fan 01 according to the carbon dioxide concentration value. Through the embodiment, when the carbon dioxide concentration value is lower than the target concentration, the carbon dioxide concentration control unit sends a first instruction for increasing the air volume to the first induced draft fan 01 so as to meet the plant requirement and promote the plant growth; otherwise, a first instruction for reducing the first air volume is sent to the first induced draft fan 01, so that waste of tail gas is avoided.

In some embodiments, the humidity control unit is connected to the humidity monitor and the first induced draft fan 01, and is configured to receive a humidity value of the humidity monitor and send a second instruction for controlling the air volume to the first induced draft fan 01 according to the humidity value. Through the arrangement of the above embodiment, when the humidity value is lower than the target air humidity, the humidity control unit sends a second instruction for increasing the air volume to the first induced draft fan 01, so as to improve the humidifying efficiency of the tail gas to the planting system 21, improve the air humidity of the planting system 21 and promote the growth of plants; otherwise, a second instruction for reducing the first air quantity is sent to the first induced draft fan 01, so that excessive water vapor brought by tail gas is avoided.

In some embodiments, the temperature control unit is connected to the temperature monitor and the first induced draft fan 01, and is configured to receive the temperature value of the temperature monitor and send a third instruction for controlling the air volume to the first induced draft fan 01 according to the temperature value. Through the arrangement of the above embodiment, when the temperature value is lower than the target air temperature, the temperature control unit sends a third instruction for increasing the air volume to the first induced draft fan 01, so as to improve the heat transfer efficiency of the tail gas to the planting system 21, improve the temperature of the planting system 21, and promote the growth of plants; otherwise, a third instruction for reducing the first air volume is sent to the first induced draft fan 01, so that excessive heat brought by tail gas is avoided, and the planting system 21 is cooled.

Since the tail gas can affect the carbon dioxide concentration, the air temperature and the air humidity of the planting system 21 at the same time when the tail gas is introduced into the planting system 21, and the carbon dioxide concentration, the air temperature and the air humidity are not uniform, the first instruction, the second instruction and the third instruction may be different at the same time, which causes a problem in instruction execution, in some embodiments, the first instruction includes a first increase instruction for increasing the air volume of the first induced draft fan 01 by a value T1, a first decrease instruction for decreasing the air volume of the first induced draft fan 01 by a value T2, the second instruction includes a second increase instruction for increasing the air volume of the first induced draft fan 01 by a value T3, a second decrease instruction for decreasing the air volume of the first induced draft fan 01 by a value T4, the third instruction includes a third increase instruction for increasing the air volume of the first induced draft fan 01 by a value T5, and a third increase instruction for decreasing the air volume of the first induced draft fan 01 by a value T6, the above T1, T2, T3, T4, T5 and T6 are each independently greater than or equal to 0, the above-mentioned difference in the instructions includes that a first increase instruction and a second decrease instruction are issued simultaneously, a first increase instruction and a third decrease instruction are issued simultaneously, a first decrease instruction and a second increase instruction are issued simultaneously, a first decrease instruction and a third increase instruction are issued simultaneously, a second increase instruction and a third decrease instruction are issued simultaneously, a first increase instruction and a second increase instruction are issued simultaneously with T1 ≠ T3, a first increase instruction and a third increase instruction are issued simultaneously with T1 ≠ T5, a second increase instruction and a third increase instruction are issued simultaneously with T3 ≠ T5, a first decrease instruction and a second decrease instruction are issued simultaneously with T2 ≠ T4, a first decrease instruction and a third decrease instruction are issued simultaneously with T2 ≠ T6, in order to solve the problem caused by the difference, the control system 23 may further include a determining unit, where the determining unit is connected to the carbon dioxide concentration control unit, the temperature control unit, and the humidity control unit, and is configured to send a final instruction to the carbon dioxide concentration control unit, the temperature control unit, and the humidity control unit when the first instruction, the second instruction, and the third instruction are not simultaneously executed at the same time. The above-mentioned determination unit is used to solve the problems caused by the above-mentioned contradiction, i.e. the regulation of the carbon dioxide concentration of the planting system 21 is the primary task, and the regulation of the air temperature of the planting system 21 is the secondary task. The judging unit can be realized by adopting a conventional module with similar functions.

For example, when the first instruction is executed, which causes the temperature and/or humidity of the planting system 21 to deviate more from the target air temperature and the target air humidity, the temperature and humidity adjustment device of the planting system 21 is used for adjustment. That is, the adjustment of the carbon dioxide concentration of the planting system 21 mainly comes from the adjustment of the air volume of the first induced draft fan 01, the adjustment of the temperature and the air humidity of the planting system 21 mainly comes from the adjustment of the temperature and humidity adjusting equipment of the plant factory 2, and the adjustment of the air volume of the first induced draft fan 01 is used as an auxiliary adjusting means. The plant factory 2 is provided with self-contained temperature and air humidity control devices, which refer to the prior art and are not described in detail in this application.

In some embodiments, as shown in fig. 4, each of the plant factories 2 further includes a heat exchange system 24 for adjusting the temperature of the planting system 21, and the tail gas outlet is connected with the heat exchange system 24 through a second induced draft fan 02 to provide a heat exchange medium for the heat exchange system 24.

In addition to utilizing first draught fan 01 to send tail gas into planting system 21 and can realize with planting system 21's direct heat transfer, send tail gas into heat transfer system 24 through second draught fan 02 and carry out indirect heat transfer as heat transfer medium and planting system 21 and also can realize the temperature adjustment to planting system 21, this adjustment does not influence the carbon dioxide concentration of planting system 21 in addition, and the waste heat utilization of tail gas has been realized to this mode. Certainly, after heat exchange, if necessary, the tail gas after heat exchange can be sent to the planting system 21 for further utilization, for example, there are a plurality of plant factories or a plurality of plant factories having a plurality of planting systems, then a part of the tail gas is sent to the heat exchange system of a plant factory requiring heat exchange by the second induced draft fan, or sent to the heat exchange system corresponding to the planting system requiring heat exchange for heat exchange to cool the tail gas, and then the cooled tail gas is sent to the planting system of another plant factory requiring carbon dioxide supplementation or the planting system requiring carbon dioxide supplementation in the same plant factory.

In order to adjust the temperature of the planting system 21 more accurately and timely by using the tail gas, in some embodiments, as shown in fig. 4, the temperature control unit is connected to the temperature monitor and the second induced draft fan 02 respectively, and is configured to receive the temperature value of the temperature monitor and send a fourth instruction for adjusting and controlling the air volume to the second induced draft fan 02 according to the temperature value. Through the arrangement of the above embodiment, when the temperature value is lower than the target air temperature, the temperature control unit sends a fourth instruction for increasing the air volume to the second induced draft fan 02, so as to improve the heat transfer efficiency of the tail gas to the planting system 21, improve the temperature of the planting system 21, and promote the growth of plants; otherwise, a fourth instruction for reducing the air volume is sent to the second induced draft fan 02, so that excessive heat brought by tail gas is avoided, and the planting system 21 is cooled.

In some embodiments, the control system 23 further includes a determining unit, connected to the carbon dioxide concentration control unit, the temperature control unit, and the humidity control unit, respectively, for sending a final instruction to the carbon dioxide concentration control unit, the temperature control unit, and the humidity control unit to preferentially execute the first instruction and the fourth instruction at the same time and then execute the second instruction when the first instruction, the second instruction, and the third instruction are different at the same time. In this embodiment, "the first instruction, the second instruction, and the third instruction are different at the same time" has the same meaning as "the first instruction, the second instruction, and the third instruction are different at the same time" in the foregoing embodiment, and thus, description thereof is omitted. The above embodiment is based on that the tail gas can independently enter the heat exchange system 24 as a heat exchange medium to individually adjust the temperature of the planting system 21, so that when the first instruction, the second instruction and the third instruction are different, the first instruction and the fourth instruction can be executed simultaneously, and the simultaneous adjustment of the carbon dioxide concentration and the air temperature is realized.

After the tail gas exchanges heat with the planting system 21 in the heat exchange system 24, saturated water vapor in the tail gas is condensed to form condensed water, and in some embodiments, the heat exchange system 24 further includes a first condensed water collecting device; and/or the tail gas outlet is connected with the planting system through a flue so as to provide tail gas for the planting system, the first induced draft fan is arranged on the flue, and the lowest position of the flue is provided with a second condensed water collecting device so as to collect condensed water in the flue, such as an opening at the lowest position of the flue and a condensing pipe communicated with the opening and used for collecting the condensed water in the flue.

In order to reduce the recycling cost of the condensed water, in some embodiments, the planting system 21 is further provided with a water supply device for supplying water to plants, and the first condensed water collection device and/or the second condensed water collection device are connected with the water supply device. Namely, the condensed water is used as water for plant growth, so that the condensed water can be reused in a short distance.

In some embodiments of the present application, the ammonia desulfurization and decarbonization device comprises an ammonia desulfurization unit 11 and an ammonia decarbonization unit 12, wherein the ammonia desulfurization unit 11 comprises a desulfurization flue gas outlet; the ammonia decarburization unit 12 comprises ammonia supply equipment, a desulfurized flue gas inlet and a tail gas outlet, and the desulfurized flue gas outlet is connected with the desulfurized flue gas inlet.

The ammonia process desulfurization unit of the above-mentioned embodiment of this application can be the ammonia process desulphurization unit that prior art is commonly used, in some embodiments, ammonia process desulfurization unit 11 wherein includes the concentrated unit of desulfurization that sets gradually from bottom to top, desulfurization absorption unit and particulate matter control unit, desulfurization concentration unit, desulfurization absorption unit and particulate matter control unit all are provided with first equipment that sprays, desulfurization concentration unit, two adjacent units are provided with the first liquid trap that only allows gas to pass through in desulfurization absorption unit and the particulate matter control unit, particulate matter control unit links to each other with desulfurization flue gas exhaust apparatus, desulfurization concentration unit links to each other with thiamine salt exhaust apparatus. And concentrating the ammonium sulfate salt by using a desulfurization concentration unit, and adjusting the concentration of the formed ammonium sulfate and ammonium bisulfate by adjusting process conditions. By utilizing the desulfurization absorption unit, the capture and conversion of other sulfur oxides (mainly sulfur dioxide) to be treated are realized through the countercurrent contact among ammonia, oxidizing air and gas to be treated, and the sulfur ammonium salt is formed. The particle control unit is used for controlling the concentration of the particles in the desulfurized flue gas, such as preventing the particles from overflowing with the desulfurized flue gas through spraying.

The application of ammonia process decarbonization unit 12 can be the ammonia process decarbonization device that prior art was commonly used, ammonia process decarbonization unit includes the carbon cooling unit that sets gradually from bottom to top, decarbonization absorption unit and ammonia escape the control unit, carbon cooling unit, decarbonization absorption unit and ammonia escape the control unit and all are provided with the second and spray equipment, carbon cooling unit, two adjacent units are provided with the second liquid trap that only allows gaseous passing through in decarbonization absorption unit and the ammonia escape the control unit, treat that the gaseous entry sets up on carbon cooling unit, decarbonization absorption unit links to each other with ammonium bicarbonate discharge apparatus, ammonia escape the control unit and links to each other with tail gas discharge apparatus. The gas to be treated entering the ammonia decarburization unit is cooled by the carbon cooling unit, so that excessive ammonia escape caused by overhigh temperature is avoided, and the decarburization effect is improved; the ammonia and the carbon oxide are subjected to countercurrent contact reaction in the decarburization absorption unit to realize the absorption of the carbon oxide and form a carbon ammonium salt; in the ammonia escape control unit, ammonia is liquefied and controlled to escape along with tail gas by a spraying mode.

The ammonia supply equipment can also supply the ammonia source for the ammonia desulphurization unit at the same time, and only needs to independently supply the ammonia source of the ammonia supply equipment by using two pipelines which can be independently controlled.

In some embodiments, the carbon dioxide concentration control unit is connected to the carbon dioxide concentration monitor and the ammonia supply device, respectively, and is configured to receive the carbon dioxide concentration value monitored by the carbon dioxide concentration monitor and issue an instruction for regulating the supply amount of ammonia gas to the ammonia supply device according to the carbon dioxide concentration value to control the decarbonization efficiency of the ammonia decarbonization unit. Through the arrangement of the above embodiment, when the carbon dioxide concentration value is lower than the target concentration, the carbon dioxide concentration control unit sends an instruction of reducing the supply amount of ammonia gas to the ammonia supply device so as to reduce the decarburization efficiency and increase the content of carbon dioxide in the tail gas, thereby satisfying the plant requirements and promoting the plant growth; and otherwise, sending an instruction for increasing the supply amount of the ammonia gas to the ammonia supply device so as to increase the decarburization efficiency and reduce the content of carbon dioxide in the tail gas, thereby avoiding greenhouse effect caused by emptying excessive carbon dioxide which cannot be utilized by plants.

In some embodiments, the ammonia decarbonization unit further has an ammonium carbonate outlet, the ammonia desulfurization unit further has an ammonium sulfate outlet, and as shown in fig. 4, the plant factory 2 further includes a nutrient solution system 25, and the nutrient solution system 25 includes: the monitoring system 22 further comprises a nutrient solution concentration monitor, the ammonium sulfate outlet and the ammonium bicarbonate outlet are respectively connected with the nutrient solution supply unit through pipelines, and the pipelines are provided with liquid pumps and/or flow regulating valves; the control system 23 further includes a nutrient solution control unit, which is connected to the liquid pump and/or the flow regulating valve and the nutrient solution concentration monitor, respectively, to receive the nutrient element concentration value of the nutrient solution concentration monitor and send a flow regulation instruction to the liquid pump and/or the flow regulating valve according to the nutrient element concentration value. The ammonium sulfate produced in the desulfurization process is directly used as a sulfur fertilizer and a carbon fertilizer, the ammonium bicarbonate produced in the decarburization process is directly used as a nitrogen fertilizer and a carbon fertilizer and is sent to the nutrient solution supply unit to be used as nutrient solution, and the flow rate of the ammonium sulfate is regulated and controlled through an instruction sent by the nutrient solution control unit, so that the concentration of the corresponding nutrient elements is regulated in real time. The ammonium bicarbonate salt and the ammonium bicarbonate salt are both in the form of solution, the concentration of the ammonium bicarbonate salt can be adjusted according to the desulfurization and decarburization processes, the specific adjustment modes are the prior art, and the details are not repeated.

In order to improve the photosynthesis ability of the plant, in some embodiments, the monitoring system 22 further includes an illumination intensity monitor for monitoring the illumination intensity of the planting system 21, an illumination device is disposed in the planting system 21, and the control system 23 further includes an illumination control unit, which is respectively connected to the illumination intensity monitor and the illumination device, and is configured to receive the illumination intensity value provided by the illumination intensity monitor and send an instruction for adjusting the illumination intensity to the illumination device according to the illumination intensity value. The illumination intensity is set according to the growth rule of the plants, and the illumination intensity of the illumination equipment is adjusted according to the setting, so that the utilization rate of illumination and the photosynthesis capacity of the plants are improved.

The method for applying the tail gas after desulfurization and decarburization by ammonia process to the plant factory and the tail gas treatment method according to the present application will be described below by way of examples.

Example 1

The implementation flow of this embodiment refers to fig. 2, and includes:

the flue gas is desulfurized by an ammonia method to generate desulfurized flue gas and ammonium sulfate; the method comprises the steps of carrying out ammonia decarburization treatment on desulfurized flue gas to obtain desulfurized and decarbonized tail gas and ammonium bicarbonate, sending the tail gas into a planting system of plant engineering to serve as at least part of a carbon dioxide gas source for plant photosynthesis, providing at least part of heat for the planting system by utilizing waste heat of the tail gas, and compensating air humidity for the planting system by utilizing saturated steam in the waste heat. The ammonium sulfate salt comprises sulfate and/or ammonium bisulfate, the ammonium bicarbonate salt comprises ammonium carbonate and ammonium bicarbonate, and the ammonium sulfate salt and the ammonium bicarbonate salt are sent to a nutrient solution system of a plant factory to be used as nutrient solution.

The above-mentioned flow can be implemented by using the system for applying the tail gas after ammonia desulphurization and decarbonization to the plant factory shown in fig. 4, wherein as shown in fig. 4, the flue gas treatment system comprises an ammonia desulphurization unit 11, an ammonia decarbonization unit 12 and a plant factory 2, and the ammonia desulphurization unit 11, the ammonia decarbonization unit 12 and a planting system 21 of the plant factory 2 are connected in sequence along the flue gas direction. The ammonia desulfurization unit 11 produces ammonium sulfate and the ammonia decarbonization unit 12 produces ammonium bicarbonate which is supplied to the planting system 21 of the plant factory 2 as a nitrogen fertilizer, a sulfur fertilizer, and a carbon fertilizer.

FIG. 4 is a schematic diagram showing the construction of the ammonia desulfurization tower and the ammonia decarbonization tower with reference to FIG. 5, containing SO ₂ 、CO ₂ The flue gas enters a desulfurizing tower shown in fig. 5, the desulfurizing tower comprises a desulfurizing concentration section 111, a desulfurizing absorption section 112 and a particulate matter control section 113, which are arranged in sequence from bottom to top, and two adjacent layers are separated by a liquid collector which only allows the gas to pass through. The flue gas is cooled and simultaneously concentrated with a concentrated ammonium sulfate solution by a concentrated circulating pump 115, and the concentrated ammonium sulfate solution is sent to a planting system of the plant factory 2 through an ammonium sulfate discharge pump 119. And (4) carrying out absorption spraying circulation by using a first desulfurization absorption circulating pump 116, a second desulfurization absorption circulating pump 117 and the oxidation circulating tank 114 to absorb sulfur dioxide in the tail gas. And the particle control circulating pump 118 is used for washing and spraying circulation, so that the particle emission is reduced. The ammonia is metered and then fed to the oxidation recycle tank 114. The oxidizing air de-oxidizing circulation tank 114 oxidizes the ammonium sulfite solution. The concentration of sulfur dioxide in the tail gas after ammonia desulphurization is less than or equal to 25mg/Nm by regulating and controlling process parameters ³ Dust concentration is less than or equal to 3mg/Nm ³ Ammonia escape less than or equal to 3mg/Nm ³ The temperature is 45 ℃, the saturation humidity is 12 percent, and the content of CO2 is 12 percent.

The desulfurized flue gas enters the decarbonization tower shown in fig. 5, and the decarbonization cooling section 121, the decarbonization absorption section 122 and the ammonia escape control section 123 are sequentially arranged from bottom to top, and two adjacent layers are separated by a liquid collector which only allows gas to pass through. The decarbonization cooling circulating pump 124 and the cooling heat exchanger 128 are used for absorption spraying circulation to reduce the temperature of the flue gas. The carbon dioxide in the tail gas is absorbed by performing absorption spray circulation using the decarburization absorption circulation pump 125. The ammonia escape control circulating pump 126 is used for washing and spraying circulation, and ammonia emission is reduced. The ammonia is metered and then sent to the decarbonization absorption section 122. The aqueous ammonium bicarbonate solution is sent to the plant by an ammonium bicarbonate discharge pump 127. And one part of the decarbonized tail gas is sent into a planting system of a plant factory by using a first induced draft fan, and the other part of the decarbonized tail gas is sent into a heat exchanger for exchanging heat with the planting system by using a second induced draft fan. The concentration of sulfur dioxide in the tail gas after ammonia decarburization is less than or equal to 8mg/Nm by regulating and controlling process parameters ³ Dust concentration is less than or equal to 1mg/Nm ³ Ammonia escape less than or equal to 2mg/Nm ³ Temperature 25 ℃, saturation humidity, CO ₂ The content of (B) was 5.6%. The decarburization efficiency by the ammonia process was 58%.

Plant factory 2 form adopts a refrigerator typeAs shown in fig. 6, the interior of the plant cultivation container is in a multilayer structure, each layer can control different growth environment parameters and nutrient supply, and different plants can be planted in different layers. Including planting system 21, monitoring system 22, control system 23, heat transfer system 24, nutrient solution system 25, monitoring system 22 includes carbon dioxide concentration detector, the illumination monitor, air humidity monitor, the temperature monitor, nutrient solution concentration monitor, be equipped with multilayer vegetation tray in planting system 21, every layer is equipped with lighting apparatus, ventilation equipment, the illumination monitor, carbon dioxide concentration detector, air humidity monitor, the temperature monitor, nutrient solution concentration monitor, the parameter of above-mentioned each monitor monitoring plant growth environment, including carbon dioxide concentration parameter, the nutrient solution parameter, the illumination parameter, the air humidity parameter, the temperature parameter. The control system 23 comprises a database storing various plant growth environment parameters, the control system 23 automatically controls the illumination equipment to increase illumination by comparing detection data provided by the monitoring system with the database, controls the ventilation equipment to improve carbon dioxide concentration and air humidity, and simultaneously adjusts the amount of tail gas sent into the planting system and the amount of tail gas entering the heat exchange system by sending air volume adjusting signals to the first draught fan and the second draught fan, so as to realize auxiliary adjustment of carbon dioxide concentration, air humidity and temperature; and simultaneously, required nutrients are automatically supplied through the nutrient solution system 25 through a control system according to requirements, wherein the control system is used for adjusting the pump speed of the ammonium sulfate discharge pump 119 and the ammonium bicarbonate discharge pump 127 to adjust the flow of ammonium sulfate and ammonium bicarbonate to the nutrient solution system 25. And the tail gas exchanges heat with the heat exchange system to obtain condensed water, and the condensed water is collected and then used as a water source to supply the planting system when needed. Wherein the plant factory CO is controlled ₂ The concentration is 700-1500ppm, the temperature is 18-30 ℃, and the humidity is 50-75%.

In the embodiment, the tail gas after the ammonia desulphurization and decarbonization treatment contains a small amount of CO ₂ Saturated water and waste heat are sent to a plant factory to be used as a carbon source, a water source and a heat source, so that the temperature, the humidity and the CO of the plant factory are reached ₂ The concentration is controlled at low cost, and condensed water in the flue gas and ammonium sulfate and ammonium bicarbonate fertilizers which are byproducts of desulfurization and decarburization are simultaneously utilized for plant growthAnd greatly reduces the production cost of plant factories.

Claims

1. A method for applying tail gas subjected to ammonia desulphurization and decarbonization to a plant factory is characterized by comprising the following steps:

carrying out ammonia desulphurization and decarbonization treatment on the flue gas to obtain tail gas;

feeding the tail gas into a planting system of a plant to adjust an operating parameter of the plant, the operating parameter comprising one or more of carbon dioxide concentration, air humidity, and air temperature.

2. The method for the plant factory based on the tail gas after ammonia desulphurization and decarbonization as claimed in claim 1, characterized in that the target carbon dioxide concentration of the planting system is 500-2500 ppm, preferably 700-1500 ppm; and/or the target air temperature of the planting system is 10-40 ℃, preferably 18-30 ℃; and/or the target air humidity of the planting system is 20-80%, preferably 50-75%.

3. The method for applying the tail gas after the ammonia desulphurization and decarbonization to the plant factory according to the claim 2, characterized in that the method for applying the tail gas after the ammonia desulphurization and decarbonization to the plant factory further comprises:

the adjustment mode 1) is used for adjusting the feeding amount of the tail gas to the planting system according to the difference value between the real-time carbon dioxide concentration of the planting system and the target carbon dioxide concentration;

and/or an adjusting mode 2) adjusting the feeding amount of the tail gas to the planting system according to the difference value between the real-time air humidity of the planting system and the target air humidity;

and/or an adjusting mode 3) adjusting the feeding amount of the tail gas to the planting system according to the difference value between the real-time air temperature of the planting system and the target air temperature;

preferably, when the feed amount of the adjustment method 1), the feed amount of the adjustment method 2), and the feed amount of the adjustment method 3) are different at the same time, the adjustment method 1) is preferentially performed, and then the adjustment method 2) is performed.

4. The method for applying the tail gas after the ammonia desulphurization and decarbonization to the plant factory according to the claim 3, characterized in that the method for applying the tail gas after the ammonia desulphurization and decarbonization to the plant factory further comprises:

indirectly exchanging heat between at least a portion of the tail gas and the planting system;

preferably, the method for applying the tail gas after ammonia desulphurization and decarbonization to the plant factory further comprises an adjustment mode 4): adjusting the flow of the tail gas exchanging heat with the planting system according to the difference value between the real-time air temperature of the planting system and the target air temperature;

preferably, when the feed amount of the adjustment mode 1), the feed amount of the adjustment mode 2), and the feed amount of the adjustment mode 3) are different at the same time, the adjustment mode 1) and the adjustment mode 4) are preferably performed at the same time, and then the adjustment mode 2) is performed;

and/or the tail gas generates first condensed water after indirect heat exchange with the planting system, and/or the tail gas generates second condensed water when being sent into the planting system;

preferably, the method for using the tail gas after desulfurization and decarbonization based on the ammonia process in the plant factory further comprises the step of sending the first condensed water and/or the second condensed water into the planting system as at least one water source of the planting system.

5. The method for plant factory based on tail gas after ammonia desulphurization and decarbonization as claimed in any one of claims 1 to 4, wherein the ammonia desulphurization and decarbonization treatment comprises:

carrying out ammonia desulphurization treatment on the flue gas to obtain desulfurized flue gas;

carrying out ammonia decarburization treatment on the desulfurized flue gas to obtain the tail gas;

preferably, the first and second electrodes are formed of a metal,

in the desulfurization flue gas, the concentration of sulfur dioxide is less than or equal to 50mg/Nm ³ Preferably ≦ 35mg ≦Nm ³ ；

And/or the dust concentration in the desulfurized flue gas is less than or equal to 10mg/Nm ³ Preferably ≤ 5mg/Nm ³ ；

And/or ammonia escape is less than or equal to 8mg/Nm in the ammonia desulphurization process ³ Preferably ≤ 3mg/Nm ³ ；

And/or the concentration of sulfur dioxide in the tail gas is less than or equal to 20mg/Nm ³ Preferably ≤ 10mg/Nm ³ ；

And/or the volume content of carbon dioxide in the tail gas is 0.5-10%, preferably 1-6%;

and/or the dust concentration in the tail gas is less than or equal to 5mg/Nm ³ Preferably ≤ 3mg/Nm ³ ；

And/or the temperature of the tail gas is 10-60 ℃, preferably 15-50 ℃;

and/or the ammonia escape in the ammonia decarburization process is less than or equal to 5mg/Nm ³ Preferably ≤ 3mg/Nm ³ ；

And/or the method for using the tail gas after ammonia desulphurization and decarbonization in the plant factory further comprises adjusting the decarbonization efficiency of the ammonia decarbonization treatment according to the difference value between the real-time carbon dioxide concentration of the planting system and the target carbon dioxide concentration, and the method for adjusting the decarbonization efficiency of the ammonia decarbonization treatment comprises adjusting the ammonia supply amount of the ammonia decarbonization treatment; preferably, the decarburization efficiency of the ammonia process decarburization is 20 to 98 percent;

and/or the ammonia desulfurization process further produces a ammonium sulfate salt, the ammonium sulfate salt comprising ammonium sulfate and/or ammonium bisulfate; and/or the ammonia process decarbonization treatment also produces ammonium bicarbonate salts, including ammonium carbonate and/or ammonium bicarbonate; preferably, the method for using the tail gas after ammonia-based desulfurization and decarbonization in the plant factory further comprises the following steps:

feeding the ammonium sulfate salt and/or the ammonium carbonate salt to the plant factory for use as a nutrient solution for plant growth;

preferably, the planting system adopts nutrient solution to provide nutrient elements for plants, and the method for applying the tail gas after ammonia desulphurization and decarbonization to the plant factory further comprises the following steps:

adjusting the feeding amount of the ammonium sulfate salt and/or the ammonium carbonate salt into the planting system in real time according to the difference value between the real-time nutrient element concentration value and the target nutrient element concentration value in the nutrient solution, wherein the nutrient element concentration value comprises a sulfur element concentration value, and/or a nitrogen element concentration value and/or a carbon element concentration value.

6. A system for tail gas is used for plant factory after ammonia process desulfurization decarbonization, its characterized in that includes:

the ammonia desulphurization and decarbonization device is used for desulphurization and decarbonization of flue gas and comprises a tail gas outlet;

a plant comprising a planting system, the off-gas outlet connected with the planting system to provide off-gas to the planting system.

7. The system for the plant factory based on the tail gas obtained by ammonia desulphurization and decarbonization according to the claim 6, wherein the tail gas outlet is connected with the planting system through a first induced draft fan;

and/or the plant factory further comprises:

a monitoring system comprising a carbon dioxide concentration monitor for monitoring a concentration of carbon dioxide in the planting system, a moisture detector for monitoring an air humidity of the planting system, and/or a temperature detector for monitoring an air temperature in the planting system;

a control system comprising a carbon dioxide concentration control unit, a humidity control unit, and/or a temperature control unit;

preferably, the first and second electrodes are formed of a metal,

the carbon dioxide concentration control unit is respectively connected with the carbon dioxide concentration monitor and the first induced draft fan and is used for receiving the carbon dioxide concentration value monitored by the carbon dioxide concentration monitor and sending a first instruction for regulating and controlling air volume to the first induced draft fan according to the carbon dioxide concentration value;

and/or the humidity control unit is respectively connected with the humidity monitor and the first induced draft fan and is used for receiving the humidity value of the humidity monitor and sending a second instruction for regulating and controlling the air volume to the first induced draft fan according to the humidity value;

and/or the temperature control unit is respectively connected with the temperature monitor and the first induced draft fan and is used for receiving the temperature value of the temperature monitor and sending a third instruction for regulating and controlling the air volume to the first induced draft fan according to the temperature value;

preferably, the control system further includes a determination unit, the determination unit is connected to the carbon dioxide concentration control unit, the temperature control unit and the humidity control unit respectively, and is configured to send a final instruction to the carbon dioxide concentration control unit, the temperature control unit and the humidity control unit when the first instruction, the second instruction and the third instruction are not simultaneously executed to the carbon dioxide concentration control unit and the temperature control unit at the same time, where the final instruction is to execute the first instruction preferentially and then execute the second instruction.

8. The system for plant factory based on ammonia desulphurization and decarbonization of tail gas according to claim 7, wherein each plant factory further comprises:

the tail gas outlet is connected with the heat exchange system through a second induced draft fan so as to provide a heat exchange medium for the heat exchange system;

preferably, the temperature control unit is connected to the temperature monitor and the second induced draft fan respectively, and is configured to receive the temperature value of the temperature monitor and send a fourth instruction for adjusting and controlling the air volume to the second induced draft fan according to the temperature value;

preferably, the control system further includes a judging unit, which is connected to the carbon dioxide concentration control unit, the temperature control unit, and the humidity control unit, respectively, and configured to send a final instruction to the carbon dioxide concentration control unit, the temperature control unit, and the humidity control unit when the first instruction, the second instruction, and the third instruction are not the same at the same time, where the first instruction, the second instruction, and the third instruction preferentially execute the first instruction and the fourth instruction at the same time, and then execute the second instruction;

preferably, the heat exchange system further comprises a first condensed water collecting device; and/or the tail gas outlet is connected with the planting system through a flue so as to provide tail gas for the planting system, the first induced draft fan is arranged on the flue, and a second condensate water collecting device is arranged at the lowest position of the flue so as to collect condensate water in the flue;

preferably, the planting system is further provided with a water supply device for supplying water to plants, and the first condensed water collection device and/or the second condensed water collection device are/is connected with the water supply device.

9. The system for plant factory based on tail gas after ammonia desulphurization and decarbonization as claimed in claim 8, wherein the ammonia desulphurization and decarbonization device comprises:

the ammonia desulphurization unit comprises a desulphurization flue gas outlet;

the ammonia decarburization unit comprises ammonia supply equipment, a desulfurized flue gas inlet and the tail gas outlet, and the desulfurized flue gas outlet is connected with the desulfurized flue gas inlet;

preferably, the carbon dioxide concentration control unit is connected to the carbon dioxide concentration monitor and the ammonia supply device, respectively, and is configured to receive the carbon dioxide concentration value monitored by the carbon dioxide concentration monitor and send an instruction for regulating the supply amount of ammonia gas to the ammonia supply device according to the carbon dioxide concentration value.

10. The system for a plant factory based on ammonia desulfurization and decarbonization tail gas of claim 9, wherein the ammonia desulfurization unit further has an ammonium sulfate outlet, the ammonia decarbonization unit further has an ammonium carbonate outlet, the plant factory further comprises a nutrient solution system, and the nutrient solution system comprises:

the sulfur ammonium salt outlet and the ammonium carbonate outlet are respectively connected with the nutrient solution supply unit through pipelines, liquid pumps and/or flow regulating valves are arranged on the pipelines, and the nutrient solution outlet of the nutrient solution supply unit is connected with the same as the planting unit;

the monitoring system further comprises a nutrient solution concentration monitor;

the control system also comprises a nutrient solution control unit which is respectively connected with the liquid pump and/or the flow regulating valve and the nutrient solution concentration monitor so as to receive the nutrient element concentration value of the nutrient solution concentration monitor and send a flow regulating and controlling instruction to the liquid pump and/or the flow regulating valve according to the nutrient element concentration value.