Microbial fuel cell system, control method, and method for co-producing sodium acetate

Abstract

The application discloses a microbial fuel cell system, a control method and a method for co-production of sodium acetate. The system comprises an anode chamber and a cathode chamber, and the anode chamber and the cathode chamber are separated by a proton exchange membrane. An anode component and a cathode component are arranged in the anode chamber and the cathode chamber respectively, and the anode component and the cathode component are used for supplying power to an external circuit. The anode chamber is filled with an anode medium, and a lower part of the anode component is immersed in the anode medium to form an immersion section of the anode component. The liquid level of the anode medium can be adjusted, and the immersion section of the anode component immersed in the anode medium can also be synchronously adjusted with the liquid level of the anode medium. The application can convert biomass energy into electric energy output, and can obtain sodium acetate through neutralization adjustment and purification by taking an intermediate product in a reaction process as a raw material, so that clean energy and by-product sodium acetate are co-produced.

Description

TECHNICAL FIELD

[0001] The present application relates to a microbial fuel cell, more particularly, to a microbial fuel cell system, and to a steady-state control method of the microbial fuel cell system, and to a method for co-production of sodium acetate by the microbial fuel cell system. BACKGROUND

[0002] A microbial fuel cell (MFC) is an innovative clean energy technology, which uses microorganisms to decompose organic matter in biomass waste (such as sewage, agricultural waste) as a carbon source, and directly converts its chemical energy into electrical energy through biological decomposition, achieving the dual goals of waste resource utilization and environmental pollution control.

[0003] A microbial fuel cell is composed of an anode chamber (anaerobic environment), a cathode chamber (aerobic environment), and a proton exchange membrane: microorganisms decompose organic matter in the anode chamber to release electrons and protons, electrons are transmitted to the cathode through an external circuit to form an electric current, and protons migrate through the membrane to the cathode to combine with oxygen to form water, completing the energy conversion.

[0004] The output power of a microbial fuel cell is completely determined by the internal biological reaction rate, and in the current technology, once the microbial fuel cell is assembled, the internal reaction environment lacks effective dynamic regulation means, resulting in that the biological reaction rate can only rely on the spontaneous evolution of the initial system conditions, and cannot be artificially intervened or optimally adjusted according to actual needs. This results in that the output power of the microbial fuel cell cannot be effectively adjusted, which greatly limits the practical application of the microbial fuel cell.

[0005] Therefore, a new solution is needed to solve this problem. SUMMARY

[0006] The present application aims to overcome the shortcomings of the prior art and provide a microbial fuel cell system, a control method, and a method for co-production of sodium acetate.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A microbial fuel cell system includes an anode chamber and a cathode chamber, which are separated by a proton exchange membrane; an anode component and a cathode component are respectively arranged in the anode chamber and the cathode chamber, and the anode component and the cathode component are used to supply power to an external circuit; the anode chamber is filled with an anode medium, and the lower side of the anode component is immersed in the anode medium to form an immersion section of the anode component; the liquid level of the anode medium can be adjusted, and the length of the immersion section of the anode component immersed in the anode medium can also be adjusted synchronously with the liquid level of the anode medium.

[0009] The application further provides that the upper side of the anode chamber is provided with a liquid supplementing port one, and the lower side is provided with a discharge port one; the lower side of the cathode chamber is provided with a liquid supplementing port two, and the upper side is provided with a discharge port two; the height of the inner cavity of the anode chamber is higher than that of the cathode chamber, the upper part of the cathode chamber is connected with an extension pipe, the upper end of the extension pipe is higher than the anode chamber, and the liquid level of the anode medium is higher than that of the cathode chamber.

[0010] The application further provides that the anode chamber is provided with an overflow port in the middle, the position of the overflow port is lower than the liquid level of the anode medium, and the overflow port is used for overflow output of the anode medium.

[0011] The application further provides that the anode component is in a columnar structure and is vertically installed in the anode chamber; and the liquid level sensor one is fixedly installed in the anode chamber.

[0012] The application further provides that the anode component comprises a conductive core and a plurality of anode sheets, the conductive core is in a vertical structure, the anode sheets are vertically stacked and installed outside the conductive core, and the conductive core penetrates through each conductive core in the up-down direction.

[0013] The application further provides that the anode component further comprises a plurality of insulating spacers, the insulating spacers are arranged between adjacent anode sheets, and the insulating spacers can separate the adjacent anode sheets.

[0014] The application further provides that the anode sheet and the insulating spacer are both in an umbrella-shaped structure, and the outer edge of the insulating spacer extends beyond the outer periphery of the anode sheet.

[0015] The application further provides that the anode component can be adjusted in the up-down direction in the anode chamber and is driven by a lifting driver; the liquid level sensor two is installed in the anode chamber, and the liquid level sensor two can be synchronously adjusted in the up-down direction with the anode component.

[0016] The application further provides a steady-state control method of the microbial fuel cell system.

[0017] The steady-state control method comprises a calibration step and an adjustment step.

[0018] The definition parameters are as follows: H(i, a) is used to represent the liquid level height of the anode medium in the anode chamber 1; U1(i, a) is used to represent the actual voltage of the anode component 4 and the cathode component 5; U2(i, a) is used to represent the theoretical voltage of the anode component and the cathode component; the full stroke of the anode medium liquid level height is L, L is divided into n parts, n is a natural number, i represents the position value of the anode medium liquid level height, i is [0, n]; a is the number of adjustments, and the calibration step records once after each adjustment of the anode medium liquid level height.

[0019] The calibration step comprises the following steps.

[0020] Step 1, initially perform anode medium liquid level adjustment, recorded as a = 0, first adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position, record the data value: H(i, 0), U1(i, 0) as the original data;

[0021] Step 2, according to the original data, calculate the theoretical voltage change parameter k: k = (U1(n, a)-U1(0, a)) / n;

[0022] Theoretical voltage U2(i, a) = k x i;

[0023] The adjustment step comprises:

[0024] When the output voltage of the anode part and the cathode part needs to be adjusted, the anode medium liquid level is adjusted to the corresponding liquid level height according to the theoretical voltage U2(i, a); when the adjusted voltage is less than the target voltage value, the anode medium liquid level is increased to increase the length of the immersion section; when the adjusted voltage is greater than the target voltage value, the anode medium liquid level is lowered to reduce the length of the immersion section, until the adjusted voltage reaches the target voltage value.

[0025] The present application also provides a steady-state control method for a microbial fuel cell system, which uses the microbial fuel cell system as described above;

[0026] The steady-state control method comprises a calibration step and an adjustment step,

[0027] The definition parameters: H(i, a) is used to represent the liquid level height of the anode medium in the anode chamber; U1(i, a) is used to represent the actual voltage of the anode part and the cathode part; U2(i, a) is used to represent the theoretical voltage of the anode part and the cathode part; Z(i, a) is used to represent the deviation amount of the actual voltage from the theoretical voltage; A(i, a) is used to represent the theoretical compensation value required by the anode part; B(i, a) is used to represent the lifting compensation value of the lifting driver; the full lifting stroke of the anode medium liquid level is L, L is divided into n parts, n is a natural number, i represents the anode medium liquid level position value, i is [0, n]; a is the number of adjustments, and each time the anode medium liquid level adjustment is performed in the calibration step, it is recorded once;

[0028] The calibration step comprises:

[0029] Step 1, initially perform anode medium liquid level adjustment, recorded as a = 0, the anode part does not perform lifting adjustment, B(i, 0) is 0; first adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position, record the data value: H(i, 0), U1(i, 0) as the original data;

[0030] Step 2, according to the original data, the theoretical voltage variation parameter k is calculated: k = (U1(n, a) - U1(0, a)) / n;

[0031] Theoretical voltage U2(i, a) = k x i;

[0032] Voltage deviation amount Z(i, a): Z = U1(i, a) - U2(i, a);

[0033] Theoretical compensation value A(i, a) required by the anode part = Z / k;

[0034] Voltage deviation coefficient Q:

[0035]

[0036] Step 3, first compensation adjustment, recorded as a = 1, the anode medium liquid level is adjusted to the lowest position, and the anode medium is gradually increased until the highest position;

[0037] The lifting drive drives the anode part to adjust the lifting, the lifting compensation value B(i, 1) = A(i, 0), and the data values H(i, 1), U1(i, 1), Z(i, 1), A(i, 1) are recorded;

[0038] Step 4, according to the data values in step 3, the relationship coefficient P of the theoretical compensation value and the lifting compensation value is calculated:

[0039]

[0040] The adjustment step comprises:

[0041] When the output voltage of the anode part and the cathode part needs to be adjusted, the anode medium liquid level is adjusted to the corresponding liquid level height according to the theoretical voltage U2(i, a), and the lifting of the anode part is adjusted by the lifting drive to compensate and adjust the length of the immersion section.

[0042] The application further provides that the calibration step further comprises:

[0043] Step 5, second compensation adjustment, recorded as a = 2, the anode medium liquid level is adjusted to the lowest position, and the anode medium is gradually increased until the highest position;

[0044] The lifting drive drives the anode part to adjust the lifting, the lifting compensation value B(i, 2) = B(i, 1) + A(i, 1) x P, and the data values H(i, 2), U1(i, 2), Z(i, 2), A(i, 2) are recorded;

[0045] Step 6, third compensation adjustment, recorded as a = 3, the anode medium is gradually discharged, and the anode medium liquid level is adjusted from the highest position to the lowest position;

[0046] The lifting driver drives the lifting adjustment of the anode component, the lifting compensation value B(i,3)=B(i,2)-A(i,2)×P, and the record data values are H(i,3), U1(i,3), Z(i,3) and A(i,3);

[0047] In step 7, steps 4 and 5 are repeated, and the data values are continuously recorded.

[0048] In the adjustment step, the lifting driver drives the lifting adjustment of the anode component, and the preliminary lifting compensation value B(i,a)=B(i,a-1)+A(i,a-1)×(1-P).

[0049] The application also provides a method for co-producing sodium acetate by using the microbial fuel cell system.

[0050] The biomass raw material is crushed and washed to remove impurities, and then fermented to produce acetic acid, and the fermentation liquid containing acetic acid is taken as the anode medium of the anode chamber and added to the anode chamber of the microbial fuel cell system.

[0051] The anode medium in the anode chamber can be discharged as a raw material for sodium acetate, and sodium acetate can be obtained by neutralization adjustment and purification.

[0052] In summary, the application has the following advantages:

[0053] In the scheme of the application, by using a columnar anode component, the inside of the anode component is uniformly distributed, and by adjusting the length of the anode component immersed in the anode medium, the reaction surface area of the anode component in contact with the anode medium and microorganisms during the reaction can be obtained, and the voltage parameter situation that the microbial fuel cell system can output can be roughly obtained to output the required output.

[0054] By using the adjustable anode medium liquid level, the length of the anode component immersed in the anode medium can be adjusted, and the parameter situation of the system output can be adjusted, that is, by increasing the liquid level height of the anode medium, the contact area of the anode component with the anode medium and microorganisms can be increased, and the amount of electrons and protons generated by microbial reaction can also be increased, thereby increasing the output voltage; on the contrary, by reducing the liquid level height of the anode medium, the amount of electrons and protons generated by microbial reaction can also be reduced, thereby reducing the output voltage.

[0055] In this scheme, biomass waste is used as a carbon source. Through microbial treatment, acetic acid is obtained and used as an anode medium, which can be used as a carbon source for the microbial fuel cell system. After ensuring the supply of the microbial fuel cell system, the excess acetic acid (i.e., the anode medium) can be discharged. Then, the acetic acid components mixed in the anode medium are purified and separated, and the pH is adjusted to obtain sodium acetate as a byproduct. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the structure of a microbial fuel cell system in Example 1;

[0057] Figure 2 This is a schematic diagram of the anode component in Example 1;

[0058] Figure 3 This is a schematic diagram of the first structure of the anode component in Example 2;

[0059] Figure 4 This is a schematic diagram of the second structure of the anode component in Example 2;

[0060] Figure 5 This is a schematic diagram of a microbial fuel cell system in Example 3.

[0061] Figure reference numerals: Anode chamber 1; Inlet 11; Outlet 12; Overflow port 13; Cathode chamber 2; Inlet 21; Outlet 22; Extension tube 23; Proton exchange membrane 3; Anode component 4; Immersion section 401; Conductive core 41; Anode plate 42; Insulating diaphragm 43; Outer edge 431; Cathode component 5; External circuit 6; Liquid level sensor 1 71; Liquid level sensor 2 72; Lifting actuator 8. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] Example 1

[0064] This embodiment discloses a microbial fuel cell system, referring to... Figure 1 As shown, it includes an anode chamber 1 and a cathode chamber 2, which are separated by a proton exchange membrane 3. An anode component 4 and a cathode component 5 are installed in the anode chamber 1 and cathode chamber 2, respectively. The anode chamber 1 is filled with an anode medium, and the cathode chamber 2 is filled with a cathode medium.

[0065] During the system working process, the anode part 4 and the cathode part 5 supply power to the external circuit 6, the electrons flow through the external circuit 6 to form current, and the potential difference is formed at the anode part 4 and the cathode part 5 to form the voltage of the whole system. The anode chamber 1 and the cathode chamber 2 are separated by the proton exchange membrane, the microorganisms in the anode chamber 1 decompose the organic matter under anaerobic conditions to release electrons and protons, the electrons are transmitted to the cathode through the external circuit, and the protons migrate through the proton exchange membrane.

[0066] Referring to Figure 1 As shown in the drawings, the liquid supplementing port 11 is arranged on the upper side of the anode chamber 1, and the liquid discharging port 12 is arranged on the lower side of the anode chamber 1. The anode medium in the anode chamber 1 can be supplemented from the liquid supplementing port 11, and the residues and waste liquid in the anode medium can be discharged from the liquid discharging port 12. The liquid supplementing port 21 is arranged on the lower side of the cathode chamber 2, and the liquid discharging port 22 is arranged on the upper side of the cathode chamber 2. The liquid supplementing port 21 and the liquid discharging port 22 can be used to supplement and discharge the cathode medium respectively.

[0067] In addition, the overflow port 13 is arranged in the middle of the anode chamber 1, and the position of the overflow port 13 is lower than the liquid level of the anode medium. When the overflow port 13 is opened, the anode medium can be outputted outward in the form of overflow, and the anode medium can be discharged as raw material for other reactions.

[0068] The lower side of the anode part 4 is immersed in the anode medium to form the immersion section 401 of the anode part 4.

[0069] In the embodiment, the length of the immersion section 401 is adjusted to adjust the contact efficiency between the anode part 4 and the anode medium and the microorganisms, so as to adjust the amount of electrons and protons generated by the microbial reaction of the anode part 4, and the output voltage of the whole microbial fuel cell system can be controlled. In the scheme of the embodiment, the only limiting factor of the microbial fuel cell system is the contact area of the anode part 4 and the cell system.

[0070] During the reaction process, the liquid level of the anode medium in the anode chamber 1 can be adjusted, the immersion section 401 of the anode part 4 immersed in the anode medium can be adjusted synchronously with the liquid level of the anode medium, and the contact area of the anode part 4 and the anode medium and the microorganisms can be adjusted with the adjustment of the liquid level. That is, by increasing the liquid level of the anode medium, the contact area of the anode part 4 and the anode medium and the microorganisms can be increased, the amount of electrons and protons generated by the microbial reaction is also increased, and the output voltage can be increased; on the contrary, by reducing the liquid level of the anode medium, the amount of electrons and protons generated by the microbial reaction is also reduced, and the output voltage can be reduced.

[0071] Referring to Figure 1As shown, in this embodiment, the highest point of the inner cavity of the anode chamber 1 is higher than that of the cathode chamber 2. The lower half of the anode chamber 1 is filled with anolyte, while the upper half is empty. During the adjustment of the anolyte liquid level, the adjustment is mainly carried out within the space of the upper half of the anode chamber 1.

[0072] Under normal circumstances, the liquid level of the anode medium should be higher than that of the cathode chamber 2, ensuring that the cathode chamber 2 is always filled with medium and the cathode component 5 is always completely submerged. In addition, an extension pipe 23 is connected to the upper part of the cathode chamber 2. The upper end of the extension pipe 23 is higher than that of the anode chamber 1, and the upper end of the extension pipe 23 is open, which can balance the pressure in the cathode chamber 2.

[0073] Reference Figure 1 , Figure 2 As shown, in this embodiment, the anode component 4 has a cylindrical structure and is vertically installed inside the anode chamber 1, and the interior of the anode component 4 is in a uniform state. The length of the anode component 4 immersed in the anode medium, that is, the length of the immersion section 401, can directly reflect the contact area between the anode component 4 and the anode medium and microorganisms, and can also directly reflect the reaction efficiency of the overall system and the voltage output of the system.

[0074] A liquid level sensor 71 is fixedly installed inside the anode chamber 1. The liquid level sensor 71 can detect the liquid level height inside the anode chamber 1, and thus also reflect the length of the anode component 4 immersed in the anode medium, that is, the length of the immersion section 401.

[0075] Reference Figure 2 As shown, in this embodiment, the anode component 4 includes a conductive core 41 and several anode plates 42. The conductive core 41 has an upright structure, and each anode plate 42 has an elongated annular structure, which is fitted around the outer periphery of the conductive core 41. The anode plates 42 are evenly stacked vertically. The anode plates 42 are stacked vertically around the conductive core 41, and the conductive core 41 passes through each conductive core 41 vertically, thus loading all the conductive cores 41 into a whole.

[0076] The anode plate 42 uses a metal wire mesh as a carrier, and activated carbon particles are attached to the surface of the metal wire mesh to increase the contact area between the anode plate 42 and the anode medium and microorganisms. The entire anode component 4 has a cylindrical structure, and the effective reaction area on the surface of the anode component 4 is positively correlated with the liquid level of the anode medium, roughly in a direct proportional relationship.

[0077] This embodiment discloses a steady-state control method for a microbial fuel cell system, using the microbial fuel cell system described in the above embodiment. The steady-state control method includes a calibration step and an adjustment step. In use, the calibration step is first used to adjust the deviation state of the entire system; then, specific adjustments are made based on the deviation from the calibration step.

[0078] Definition parameters: H(i, a) is used to represent the liquid level of the anode medium in the anode chamber 1; U1(i, a) is used to represent the actual voltage of the anode component 4 and the cathode component 5; U2(i, a) is used to represent the theoretical voltage of the anode component 4 and the cathode component 5; the full stroke of the anode medium liquid level is L, L is divided into n parts, n is a natural number, i represents the position value of the anode medium liquid level, i is [0, n]; a is the number of adjustments, and each time the anode medium liquid level adjustment is performed in the calibration step, it is recorded once;

[0079] During the adjustment process, the change range of the immersion section 401 of the anode component 4 is also L, for example, the length of L is 100 cm, which can be evenly divided into 1000 height position points, and n is 1000.

[0080] The calibration step includes:

[0081] Step 1, initially perform anode medium liquid level adjustment, denoted as a = 0, first adjust the anode medium liquid level to the lowest position, gradually increase the anode medium, until the highest position, record the data value: H(i, 0), U1(i, 0), as the original data;

[0082] Step 2, according to the original data, the theoretical voltage change parameter k is calculated: k = (U1(n, a)-U1(0, a)) / n; k can reflect the unit length of the anode component 4 immersed in the anode medium, and the corresponding voltage parameter that can be generated; according to the theoretical voltage change parameter k, the theoretical voltage U2(i, a) = k x i can be calculated. Through the case of the theoretical voltage, the anode medium liquid level corresponding to the corresponding voltage can be obtained.

[0083] The adjustment step includes:

[0084] When the output voltage of the anode component 4 and the cathode component 5 needs to be adjusted, the anode medium liquid level is adjusted to the corresponding liquid level height according to the theoretical voltage U2(i, a); after adjusting to the corresponding liquid level height, the output voltage of the anode component 4 and the cathode component 5 will be adjusted to close to the target voltage value; then, the anode medium liquid level is fine-tuned to fine-tune the output voltage parameters of the anode component 4 and the cathode component 5, which can be closer to the target voltage value.

[0085] When the adjusted voltage is less than the target voltage value, the anode medium liquid level is increased, and the length of the immersion section 401 is increased; when the adjusted voltage is greater than the target voltage value, the anode medium liquid level is lowered, and the length of the immersion section 401 is reduced, until the adjusted voltage reaches the target voltage value.

[0086] Ideally, the active carbon is evenly distributed on the metal mesh in the anode component 4, that is, the contact reaction area corresponding to each metal mesh is the same. However, in actual conditions, the active carbon is slightly unevenly distributed on the metal mesh, and thus the submerged section 401 of the anode component 4 can be adjusted to fine-tune the output voltage parameter. In this embodiment, the length of the submerged section 401 of the anode component 4 can be adjusted by adjusting the liquid level of the anode medium.

[0087] Embodiment Two

[0088] This embodiment discloses a microbial fuel cell system, which is based on Embodiment One and further designed according to Figure 3 , Figure 4 This embodiment discloses a microbial fuel cell system, which is based on Embodiment One and further designed according to

[0089] During the adjustment of the liquid level of the anode medium, the liquid level is adjusted from a high position to a relatively low position, and the part of the anode component 4 originally attached to the anode medium is separated from the anode medium. In a short time after the adjustment is completed, the originally attached anode medium will flow downward, and during the downward flow, the steady-state time of the voltage parameter will be prolonged, which will affect the adjustment efficiency of the output voltage of the system.

[0090] Referring to FIG. 1, the anode component 4 further comprises a plurality of insulating spacers 43, and the insulating spacers 43 are arranged between the adjacent anode sheets 42. The anode sheets 42 and the insulating spacers 43 are arranged in a spaced manner, and the adjacent anode sheets 42 are separated by the insulating spacers 43. Figure 3 Under the action of the insulating spacers 43, the upper and lower anode sheets 42 can be completely separated, and thus the anode sheets 42 are only in conductive contact with the inner circumferential conductive core 41. Moreover, the outer periphery of the insulating spacer 43 is slightly larger than the outer periphery of the anode sheet 42, that is, the outer edge 431 of the insulating spacer 43 protrudes beyond the outer periphery of the anode sheet 42.

[0091] The upper and lower adjacent anode sheets 42 are insulated and separated by the insulating spacers 43, and do not directly contact each other. During the adjustment of the liquid level of the anode medium, the liquid level is adjusted from a high position to a relatively low position, the length of the submerged section 401 of the anode component 4 is reduced, and more length of the upper half of the anode component 4 will be exposed to the upper part of the anode medium. After the anode sheet 42 at the corresponding position is exposed to the upper part of the anode medium, the direct communication with the anode medium can be quickly cut off, the ion exchange between the anode sheet 42 in this region and the anode medium is cut off, which is equivalent to quickly cutting off the electrical signal reaction generated by the length of the anode sheet 42, and thus the time for the voltage parameter to reach a steady state can be shortened, and the adjustment efficiency of the output voltage of the system can be improved.

[0092] Further, referring to FIG. 1, the anode component 4 further comprises a plurality of insulating spacers 43, and the insulating spacers 43 are arranged between the adjacent anode sheets 42. The anode sheets 42 and the insulating spacers 43 are arranged in a spaced manner, and the adjacent anode sheets 42 are separated by the insulating spacers 43.

[0093] Figure 4 ​As shown, the anode sheet 42 and the insulating spacer 43 are both in umbrella shape, and the outer edge 431 of the insulating spacer 43 extends beyond the outer periphery of the anode sheet 42. From the inner periphery to the outer periphery, the height of the anode sheet 42 and the insulating spacer 43 gradually decreases, forming a state of tilting downward toward the outer periphery.

[0094] Because the insulating spacer 43 forms a tilting state, when the anode sheet 42 exposes the anode medium, the liquid attached to the anode sheet 42 can be more quickly tilted and discharged in the outer periphery direction, avoiding the anode medium remaining on the anode sheet 42 for a long time and affecting the voltage fluctuation.

[0095] Embodiment Three

[0096] This embodiment discloses a microbial fuel cell system, which is based on the microbial fuel cell system of Embodiment One or Embodiment Two, and further refers to Figure 5 The structure of the anode component 4 is further designed. In this embodiment, the anode component 4 adopts a structure that can float up and down, and can be adjusted in lifting in the anode chamber 1 and driven by a lifting driver. Moreover, a liquid level sensor two 72 is installed inside the anode chamber 1, which can be synchronously adjusted in lifting with the anode component 4, and further can directly judge the lifting change of the anode component 4 relative to the liquid surface through the liquid level change of the liquid level sensor two 72, obtain the length condition of the immersion section 401 of the anode component 4, and further can judge the theoretical voltage output condition in the current state, so as to facilitate the adjustment of the output parameters of the battery system.

[0097] This embodiment also discloses a steady state control method of a microbial fuel cell system, which adopts the microbial fuel cell system in the above embodiments. The steady state control method comprises a calibration step and an adjustment step. In use, the deviation state of the whole system is adjusted by the calibration step first, and then the specific adjustment is performed according to the deviation condition of the calibration step.

[0098] Definition parameters: H(i, a) is used to represent the liquid level height of the anode medium in the anode chamber 1; U1(i, a) is used to represent the actual voltage of the anode component 4 and the cathode component 5; U2(i, a) is used to represent the theoretical voltage of the anode component 4 and the cathode component 5; Z(i, a) is used to represent the deviation amount of the actual voltage and the theoretical voltage; A(i, a) is used to represent the theoretical compensation value required by the anode component 4; B(i, a) is used to represent the lifting compensation value of the lifting driver.

[0099] The whole lifting stroke of the anode medium liquid level height is L, which is divided into n parts, n is a natural number, i represents the position value of the anode medium liquid level height, i is [0, n]; in the anode medium liquid level adjustment process, the lowest position corresponds to i = 0, after rising one height value i = 1, in the adjustment process, every time the height value rises i = i + 1, and the highest position i = n.

[0100] a is the number of adjustments, and each time the anode medium liquid level adjustment is performed in the calibration step, it is recorded once.

[0101] In this embodiment, the lifting of the anode component 4 is adjusted to adjust the length of the immersion section 401 of the anode component 4 immersed in the anode medium, so as to realize the fine adjustment of the output parameter.

[0102] The calibration step includes:

[0103] Step 1: Initially perform anode medium liquid level adjustment, recorded as a=0, the anode component 4 is not adjusted, B(i,0) is 0; first adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position, record the data values: H(i,0), U1(i,0), as the original data;

[0104] Step 2: According to the original data, calculate the theoretical voltage change parameter k: k=(U1(n,a)-U1(0,a)) / n;

[0105] Theoretical voltage U2(i,a)=k×i;

[0106] Voltage deviation amount Z(i,a): Z=U1(i,a)-U2(i,a);

[0107] Theoretical compensation value A(i,a) required by the anode component 4: A(i,a)=Z / k;

[0108] Voltage deviation coefficient Q:

[0109]

[0110] By calculating the voltage deviation amount and the voltage deviation coefficient Q, the two can reflect the deviation value between the actual voltage value and the theoretical voltage value. In the standing state, the deviation value of the two is close to zero, and the voltage deviation coefficient Q tends to 1. The closer the voltage deviation coefficient Q is to 1, the better the uniformity and stability of the entire system. If the voltage deviation coefficient Q is too large, it means that there is an installation problem in the entire system, which needs to be adjusted. Generally, the range of the voltage deviation coefficient Q is required to be 0.8-1.2, and it can work normally within this range.

[0111] Step 3: First compensation adjustment, recorded as a=1, adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position;

[0112] The lifting drive drives the anode component 4 to adjust the lifting, the lifting compensation value B(i,1)=A(i,0), and the data values: H(i,1), U1(i,1), Z(i,1), A(i,1) are recorded.

[0113] Step 4, according to the data value in step 3, the relationship coefficient P of the theoretical compensation value and the lifting compensation value is calculated:

[0114]

[0115] By pre-calculating the adjustment parameters required at the corresponding position, the length of the immersion section 401 of the anode component 4 can be adjusted more accurately in advance, and the efficiency of the output voltage in the steady state adjustment can be improved.

[0116] Further, in order to improve the accuracy of the calibration step, the calibration step further comprises steps 4, 5 and 6;

[0117] Step 5, compensation adjustment is performed again, denoted as a=2, the anode medium liquid level is adjusted to the lowest position, and the anode medium is gradually increased until the highest position;

[0118] The lifting driver drives the anode component 4 to adjust the lifting, the lifting compensation value B(i,2)=B(i,1)+A(i,1)×P, and the data values H(i,2), U1(i,2), Z(i,2), A(i,2) are recorded;

[0119] Step 6, compensation adjustment is performed again, denoted as a=3, the anode medium is gradually discharged, and the anode medium liquid level is adjusted from the highest position to the lowest position;

[0120] The lifting driver drives the anode component 4 to adjust the lifting, the lifting compensation value B(i,3)=B(i,2)+A(i,2)×P, and the data values H(i,3), U1(i,3), Z(i,3), A(i,3) are recorded;

[0121] Step 7, steps 4 and 5 are repeated, and the data values are continuously recorded;

[0122] Through the sufficient operation of steps 4 and 5, multiple operations can be continuously performed, and the deviation of the corresponding different liquid level positions of the entire system during adjustment can be adjusted respectively, and a more accurate offset adjustment can be obtained. Moreover, by adjusting the offset compensation value of the lifting adjustment process of the anode component 4, the required deviation during the length adjustment of the immersion section 401 of the anode component 4 can be more accurately judged in advance, and the compensation adjustment parameters can be more efficiently obtained, and the accuracy of the initial adjustment during adjustment can be improved. In the calibration step, a represents the number of operations, and a is accumulated several times during each complete lifting process; a can be reset to zero for re-calibration next time, and the number of times is counted again.

[0123] The adjustment step comprises:

[0124] When the output voltage of the anode component 4 and the cathode component 5 needs to be adjusted, the liquid level of the anode medium is adjusted to the corresponding height according to the theoretical voltage U2(i, a), and the lifting of the anode component 4 is adjusted by the lifting driver, and the preliminary lifting compensation value B(i, a) = B(i, a-1) + A(i, a-1) x (1-P) is used for the adjustment, which can accurately and effectively adjust the system to the deviation range, and can realize the fast and accurate parameter adjustment. Then, the fine adjustment is performed, and the target voltage value can be reached faster.

[0125] In the adjustment step, when the output voltage is still less than the target value, the length of the immersed section 401 of the anode component 4 can be adjusted by the lifting driver, and the anode component 4 is lowered by one unit height; when the output voltage is still greater than the target value, the length of the immersed section 401 of the anode component 4 can be adjusted by the lifting driver, and the anode component 4 is raised by one unit height. The adjustment is fully adjusted until the adjusted voltage reaches the deviation range of the target voltage value. The deviation range can be controlled according to the accuracy requirement of the adjustment, and the deviation range is generally not more than 5%.

[0126] Example Four

[0127] The embodiment also discloses a method for co-producing sodium acetate by using the microbial fuel cell system in any of the above embodiments.

[0128] The method is as follows: taking the biomass raw material, crushing, washing and removing impurities, fermenting the biomass raw material to produce acetic acid, taking the fermentation liquid containing acetic acid as the anode medium of the anode chamber 1, adding the anode chamber 1 of the microbial fuel cell system, adjusting the length of the immersed section 401 of the anode component 4 by adjusting the liquid level in the anode medium, and adjusting the voltage between the anode component 4 and the cathode component 5; the anode medium in the anode chamber 1 can be discharged as a raw material for sodium acetate, and sodium acetate can be obtained by neutralization adjustment and purification.

[0129] In the process of treating the biomass raw material, acetic acid can be obtained, which can be used as a carbon source for the microbial fuel cell system; after ensuring the supply and use of the microbial fuel cell system, the excess acetic acid (i.e. the anode medium) can be discharged, and then the acetic acid component mixed in the anode medium can be separated and purified by adjusting the pH value and other treatments, and thus the by-product sodium acetate can be obtained.

[0130] The above merely describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-described embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. A microbial fuel cell system, characterized by, The application relates to a microbial fuel cell system, which comprises an anode chamber (1) and a cathode chamber (2), the anode chamber (1) and the cathode chamber (2) are separated by a proton exchange membrane (3); an anode component (4) and a cathode component (5) are arranged in the anode chamber (1) and the cathode chamber (2) respectively, the anode component (4) and the cathode component (5) are used for supplying power to an external circuit (6); the anode chamber (1) is filled with an anode medium, the lower part of the anode component (4) is immersed in the anode medium to form an immersion section (401) of the anode component (4); the liquid level of the anode medium can be adjusted, and the length of the immersion section (401) of the anode component (4) immersed in the anode medium can also be adjusted synchronously with the liquid level of the anode medium; The anode component (4) is in a columnar structure and is vertically arranged in the anode chamber (1); a liquid level sensor one (71) is fixedly arranged in the anode chamber (1); The anode component (4) comprises a conductive core (41) and a plurality of anode sheets (42), the conductive core (41) is vertically arranged, the anode sheets (42) are vertically arranged on the conductive core (41), and the conductive core (41) penetrates through each conductive core (41); The anode component (4) further comprises a plurality of insulating spacers (43), the insulating spacers (43) are arranged between adjacent anode sheets (42) and can separate the adjacent anode sheets (42); The height of the highest position of the inner cavity of the anode chamber (1) is higher than that of the cathode chamber (2), the upper part of the cathode chamber (2) is connected with an extension pipe (23), the upper end of the extension pipe (23) is higher than the anode chamber (1), and the liquid level of the anode medium is higher than that of the cathode chamber (2).

2. The microbial fuel cell system of claim 1, wherein, The upper side of the anode chamber (1) is provided with a liquid supplementing port one (11), and the lower side is provided with a discharge port one (12); the lower side of the cathode chamber (2) is provided with a liquid supplementing port two (21), and the upper side is provided with a discharge port two (22).

3. The microbial fuel cell system of claim 2, wherein, An overflow port (13) is arranged in the middle of the anode chamber (1), the position of the overflow port (13) is lower than the liquid level of the anode medium, and the overflow port (13) is used for overflow output of the anode medium.

4. The microbial fuel cell system of claim 1, wherein, The anode component (4) can be adjusted in lifting in the anode chamber (1) and is driven by a lifting driver; a liquid level sensor two (72) is arranged in the anode chamber (1), and the liquid level sensor two (72) can be synchronously adjusted in lifting with the anode component (4).

5. A method for steady state control of a microbial fuel cell system, characterized by, The application adopts the microbial fuel cell system according to any one of claims 1-4; The steady-state control method comprises a calibration step and an adjustment step, The definition parameters are as follows: H(i, a) is used for representing the liquid level of the anode medium in the anode chamber (1); U1(i, a) is used for representing the actual voltage of the anode component (4) and the cathode component (5); U2(i, a) is used for representing the theoretical voltage of the anode component (4) and the cathode component (5); the whole lifting stroke of the liquid level of the anode medium is L, L is divided into n parts, n is a natural number, i represents the position value of the liquid level of the anode medium, i is [0, n]; a is the number of adjustments, and the calibration step records once after each adjustment of the liquid level of the anode medium; The calibration step comprises: ​ Step 1, initial execution of anode medium liquid level adjustment, recorded as a = 0, first adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position, record the data value: H(i, 0), U1(i, 0) as the original data; Step 2, according to the original data, the theoretical voltage change parameter is calculated ; theoretical voltage ; The adjustment step comprises: When the output voltage of the anode component (4) and the cathode component (5) needs to be adjusted, the anode medium liquid level is adjusted to the corresponding liquid level height according to the theoretical voltage U2(i, a); when the adjusted voltage is less than the target voltage value, the anode medium liquid level is increased to increase the length of the immersion section (401); when the adjusted voltage is greater than the target voltage value, the anode medium liquid level is lowered to reduce the length of the immersion section (401), until the adjusted voltage reaches the target voltage value.

6. A method for steady state control of a microbial fuel cell system, characterized by, The microbial fuel cell system according to claim 4 is adopted; The steady-state control method comprises a calibration step and an adjustment step, Define parameters: H(i, a) is used to represent the liquid level of the anode medium in the anode chamber 1; U1(i, a) is used to represent the actual voltage of the anode component (4) and the cathode component (5); U2(i, a) is used to represent the theoretical voltage of the anode component (4) and the cathode component (5); Z(i, a) is used to represent the deviation amount of the actual voltage from the theoretical voltage; A(i, a) is used to represent the theoretical compensation value required by the anode component (4); B(i, a) is used to represent the lifting compensation value of the lifting driver; the full lifting stroke of the anode medium liquid level is L, L is divided into n parts, n is a natural number, i represents the anode medium liquid level position value, i is [0, n]; a is the number of adjustments, record once after each anode medium liquid level lifting adjustment in the calibration step; The calibration step comprises: Step 1, initial execution of anode medium liquid level adjustment, recorded as a = 0, the anode component (4) does not perform lifting adjustment, B(i, 0) is 0; first adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position, record the data value: H(i, 0), U1(i, 0) as the original data; Step 2, according to the original data, the theoretical voltage change parameter is calculated ; theoretical voltage ; Voltage deviation amount ; Theoretical compensation value required for the anode member (4) ; Voltage deviation coefficient Q: ； Step 3, first compensation adjustment, recorded as a = 1, adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position; Lift drive drives anode parts (4) to adjust, lift compensation value , record data value: H (i, 1), U1 (i, 1), Z (i, 1), A (i, 1); Step 4, according to the data value in step 3, calculate the relationship coefficient P of the theoretical compensation value and the lifting compensation value: ； The adjustment step comprises: When the output voltage of the anode component (4) and the cathode component (5) needs to be adjusted, the anode medium liquid level is adjusted to the corresponding liquid level height according to the theoretical voltage U2(i, a); at the same time, the lifting of the anode component (4) is adjusted through the lifting driver to compensate and adjust the length of the immersion section (401).

7. The steady-state control method for a microbial fuel cell system according to claim 6, characterized in that, The calibration step further comprises: Step 5, second compensation adjustment, recorded as a = 2, adjust the anode medium liquid level to the lowest position, gradually increase the anode medium until the highest position; The lift drive drives the anode member (4) to adjust and compensate the lift value The recorded data values are H(i, 2), U1(i, 2), Z(i, 2), and A(i, 2). Step 6, third compensation adjustment, recorded as a = 3, gradually discharge the anode medium, adjust the anode medium liquid level from the highest position to the lowest position; Lift drive drives anode parts (4) to adjust, lift compensation value , record data value: H(i, 3), U1(i, 3), Z(i, 3), A(i, 3); Step 7, repeat steps 4 and 5, continuously record the data value; In the adjustment step, the lift drive drives the anode member (4) to be adjusted in lift, and a preliminary lift compensation value .

8. A method for co-production of sodium acetate by a microbial fuel cell system, characterized by, A microbial fuel cell system as claimed in any one of claims 1 to 4; The biomass raw material is crushed, washed and impurities are removed. The biomass raw material is fermented to produce acetic acid. The fermentation liquid containing acetic acid is taken as the anode medium of the anode chamber (1) and is added to the anode chamber (1) of the microbial fuel cell system. The length of the immersed section (401) of the anode component (4) is adjusted by adjusting the liquid level in the anode medium to adjust the voltage between the anode component (4) and the cathode component (5). The anode medium in the anode chamber (1) is discharged and can be used as a raw material for sodium acetate. Sodium acetate is obtained by neutralization, adjustment and purification.

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