Biomass carbonization production system

Abstract

The utility model relates to a biomass carbonization production system which comprises a plurality of carbonization furnaces, the number of which is N, the plurality of heating systems are in one-to-one correspondence with the carbonization furnaces; the plurality of gas self-supply pipeline systems are in one-to-one correspondence with the carbonization furnaces and are connected with the exhaust ports of the carbonization furnaces and the heating system; the gas transfer pipeline system is used for connecting the plurality of gas self-supply pipeline systems; wherein when one carbonization furnace in the production mode needs to be shut down for maintenance, the gas transfer pipeline system communicates the gas self-supply pipeline system of the carbonization furnace needing to be shut down for maintenance with the heating systems of other carbonization furnaces, and combustible gas generated in the furnace shut down process is transferred to the heating systems of other carbonization furnaces for combustion; therefore, a torch does not need to be arranged in a biomass charcoal production place, the requirement of a production system on the place is reduced, and the utilization rate of fuel gas is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of biomass carbonization, especially a biomass carbon production system. BACKGROUND

[0002] The carbonization furnace for biomass carbon production usually adopts the method of oxygen-free dry distillation pyrolysis to realize biomass carbonization, and combustible gas is generated in the process of biomass pyrolysis for carbon production, and a specific proportion of the combustible gas composition is as follows: CO content is 29.20%, H2 content is 24.74%, CH4 content is 7.3%, and H2O content is 32.30%. In order to reduce the dependence on external energy, the combustible gas is usually introduced into a combustion chamber to provide a continuous heat source for the carbonization furnace.

[0003] However, in order to ensure the normal operation of the production system, the combustion chamber is ignited and started by the fuel system when the carbonization furnace is started, and the system is stable within 2-3 hours after starting, and the oil supply is stopped after the system is stable. During the starting process, the combustible gas produced by the carbonization furnace gradually increases from less to more, and is introduced into the burner on the combustion chamber after being introduced by the gas fan for combustion. In actual production, the carbonization furnace often stops due to coking, and the carbonization furnace needs to be stopped for 2-3 hours, and the high-temperature gas generated during this period is sent to the flare for combustion and finally discharged into the atmosphere.

[0004] In actual operation, the flare combustion is unstable due to the change of gas quantity when the furnace is stopped, and the flare needs to have a safety distance from the building, which occupies a large area. When the production site does not meet the construction conditions of the flare, the design, construction and production of the biomass carbon production system cannot be realized. UTILITY MODEL CONTENTS

[0005] In view of the above-mentioned shortcomings of the existing production technology, the present application provides a biomass carbon production system, so that the flare can not be arranged at the biomass carbon production site, the requirements of the production system on the site are reduced, and the utilization rate of the gas is improved.

[0006] The technical scheme adopted by the utility model is as follows:

[0007] A biomass carbon production system comprises,

[0008] A plurality of carbonization furnaces, the number of which is N;

[0009] A plurality of heating systems corresponding to the carbonization furnaces one by one;

[0010] A plurality of gas self-sufficient pipeline systems corresponding to the carbonization furnaces one by one, connecting the exhaust ports of the carbonization furnaces and the heating systems;

[0011] A gas transfer pipeline system connects the plurality of gas self-sufficient pipeline systems;

[0012] When one carbonization furnace in production mode needs to be shut down for maintenance, the gas transfer pipeline system connects the gas self-sufficient pipeline system of the carbonization furnace needing to be shut down for maintenance with the heating system of other carbonization furnaces, and transfers the combustible gas generated during the shutdown to the heating system of other carbonization furnaces for combustion.

[0013] As a further improvement of the above technical solution:

[0014] The gas transfer pipeline system comprises a communication pipeline and a first stop valve arranged on the communication pipeline.

[0015] The gas self-sufficient pipeline system comprises a gas pipeline connecting the exhaust port and the heating system and a gas fan arranged in the gas pipeline. The gas pipeline on one side of the gas fan is connected to the communication pipeline and forms a three-way connection point. By adjusting the opening and closing of the first stop valve, the corresponding gas pipeline is connected. A check valve is arranged on the gas pipeline between the three-way connection point and the exhaust port. The air volume of the gas fan is adjustable, which is used to change the proportion of the combustible gas generated by the carbonization furnace needing to be shut down for maintenance into the communication pipeline.

[0016] An adjusting valve is arranged on the gas pipeline on the other side of the gas fan. By adjusting the opening and closing degree of the adjusting valve, the air volume of the gas fan is adjusted.

[0017] The heating system comprises a combustion chamber and a blower connected to the combustion chamber. The flue of the combustion chamber is connected to the heating cavity of the carbonization furnace.

[0018] A burner connected to the gas pipeline is arranged on the combustion chamber.

[0019] The heating system is provided with an external fuel pipeline for supplying external energy to the combustion chamber.

[0020] N is greater than or equal to two. One carbonization furnace is in standby mode, and the remaining carbonization furnaces are in production mode.

[0021] When one carbonization furnace in production mode needs to be shut down for maintenance, the gas transfer pipeline system connects the heating system of the carbonization furnace needing to be shut down for maintenance with the heating system of the carbonization furnace in standby mode, transfers the combustible gas generated during the shutdown to the heating system of the carbonization furnace in standby mode for combustion, and is used for starting the carbonization furnace in standby mode.

[0022] N is greater than or equal to three. When one carbonization furnace needs to be shut down for maintenance, the remaining carbonization furnaces are in production mode, and the gas transfer pipeline system connects the heating system of the carbonization furnace needing to be shut down for maintenance with the heating systems of multiple carbonization furnaces in production mode.

[0023] The rated gas production of each carbonization furnace is Q, and the rated combustion of the heating system of each carbonization furnace is q, which is greater than or equal to N×Q / (N-1).

[0024] N is greater than or equal to three, the communication pipeline comprises a main pipe and a plurality of branch pipes communicating with the main pipe, the branch pipes correspond to the carbonization furnaces one by one, and a first stop valve is arranged on each branch pipe.

[0025] The utility model discious the following advantages:

[0026] The utility model discious the following advantages:

[0027] The utility model discious the following advantages:

[0028] (1) increase a carbonization furnace in the production system, make a carbonization furnace as a spare furnace, supply the combustible gas produced in the shutdown process of the carbonization furnace needing to maintain to the spare carbonization furnace to start the furnace, improve the utilization rate of gas, can not set up the flare in the production place of the biomass carbonization, reduce the requirement of production system to the site, and the continuous production of biomass carbonization is realized through the switching of two carbonization furnace modes in the shutdown process.

[0029] (2) the process system adopts the scheme of one spare for multiple uses, is more safe and reliable than the scheme of one spare for one use, is suitable for control, and makes the production capacity of whole production system more stable.

[0030] (3) by increasing the rated combustion of heating system, the combustible gas produced in the shutdown process of a carbonization furnace can be consumed by the carbonization furnace in the production mode in the production process, so that the production capacity of the production system is realized under the condition that the carbonization furnace can be maintained in the whole production system. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the first kind of situation (production process) of the embodiment three mode switching of the utility model.

[0032] Figure 2 It is the first kind of situation (mode switching process) of the embodiment three mode switching of the utility model.

[0033] Figure 3 It is the first kind of situation (after mode switching is completed) of the embodiment three mode switching of the utility model.

[0034] Figure 4 It is the second kind of situation (production process) of the embodiment three mode switching of the utility model.

[0035] Figure 5This is the second case of mode switching in Embodiment 3 of this utility model (mode switching process).

[0036] Figure 6 This is the second case of mode switching in Embodiment 3 of this utility model (supply state).

[0037] Figure 7 This is the second case of mode switching in Embodiment 3 of this utility model (after mode switching is completed).

[0038] Figure 8 This is the fourth embodiment of the present invention, which is a production mode that increases production capacity.

[0039] in:

[0040] 1. Carbonization furnace; 11. Exhaust port; 12. Flue gas outlet; 13. Flue gas inlet;

[0041] 2. Heating system; 21. Flue; 22. Combustion chamber; 23. Burner; 24. External fuel pipeline; 25. Blower;

[0042] 4. Gas self-sufficient pipeline system; 41. Gas pipeline; 42. Second shut-off valve; 43. Check valve; 44. Flow meter; 45. Gas monitor; 46. Gas blower; 47. Third shut-off valve; 48. Regulating valve;

[0043] 5. Gas transfer pipeline system; 51. Connecting pipeline; 511. Main pipe; 512. Branch pipe; 52. First shut-off valve; 53. T-junction connection point. Detailed Implementation

[0044] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0045] Example 1:

[0046] like Figures 1-8 As shown, the biomass charcoal production system of this embodiment includes multiple carbonization furnaces 1, multiple heating systems 2, multiple gas self-sufficiency pipeline systems 4, and gas transfer pipeline systems 5.

[0047] Multiple carbonization furnaces 1, numbered N;

[0048] Multiple heating systems 2, each corresponding to a carbonization furnace 1;

[0049] Multiple gas-fired self-sufficient pipeline systems 4 correspond one-to-one with the carbonization furnace 1, connecting the exhaust port 11 of the carbonization furnace 1 and the heating system 2;

[0050] The gas transfer pipeline system 5 connects multiple gas self-sufficient pipeline systems 4;

[0051] When one of the carbonization furnaces 1 in the production mode needs to be shut down for maintenance, the gas transfer pipeline system 5 connects the gas self-provided pipeline system 4 of the carbonization furnace 1 to be shut down for maintenance with the heating system 2 of the other carbonization furnaces 1, and transfers the combustible gas generated during the shutdown to the heating system 2 of the other carbonization furnaces 1 for combustion.

[0052] The other carbonization furnaces 1 refer to all the carbonization furnaces 1 except the carbonization furnace 1 to be shut down for maintenance, or part of the carbonization furnaces 1, according to the total number of the carbonization furnaces 1 and the fuel demand.

[0053] In the embodiment, the carbonization furnaces 1 are continuous carbonization furnaces, such as horizontal rotary core carbonization furnaces. In order to meet the temperature conditions required for carbonization of the biomass in the carbonization furnaces 1, the carbonization furnaces 1 are provided with the heating system 2, and the heating system 2 includes a combustion chamber 22. In order to reduce the dependence on external energy, the exhaust port 11 of the carbonization furnace 1 is connected with the gas self-provided pipeline system 4, and the combustible gas generated during the production of the charcoal is supplied to the heating system 2 for heating of the carbonization furnace 1 itself.

[0054] The specifications of each of the carbonization furnaces 1 in the production system are the same, i.e. the parameters such as the structural form and the rated output are the same, and the specifications of the heating system 2 and the gas self-provided pipeline system 4 are the same, so as to ensure that the production, shutdown and start-up time and the process parameters of each of the carbonization furnaces 1 are consistent.

[0055] The corresponding gas self-provided pipeline system 4 of the carbonization furnace 1 is connected through the gas transfer pipeline system 5, so that the combustible gas generated during the shutdown of one of the carbonization furnaces 1 is transferred to the other carbonization furnaces 1 to provide heat energy for the production of the other carbonization furnaces 1. The flare can not be arranged at the production site of the biomass charcoal, the requirement of the production system on the site is reduced, and the utilization rate of the gas is improved.

[0056] After the combustible gas is transferred, it is necessary to ensure that the amount of the feed of the carbonization furnace 1 matches the amount of the combustible gas to ensure that the temperature of the combustible gas generated by the carbonization reaction in the carbonization furnace 1 is the process exhaust temperature, and thus the quality of the product is ensured.

[0057] The process exhaust temperature is the required temperature of the combustible gas discharged from the carbonization furnace 1 during the production process. The heat provided by the heating system 2 is matched with the amount of the feed of the carbonization furnace 1 to keep the flue gas temperature in the flue 21 of the heating system 2 relatively constant. The flue gas temperature is the process heating temperature, the stable carbonization reaction is maintained, and thus the combustible gas discharged from the exhaust port 11 is also within the process exhaust temperature range, the stability of the product of the carbonization reaction is ensured, and thus the quality of the product is ensured.

[0058] In an exemplary embodiment, a specific production condition of the carbonization furnace 1: the biomass is cotton stalk, the amount of the feed of each of the carbonization furnaces 1 is 1.5-2 t / h, the flow rate of the combustible gas is 1275 Nm 3 / h-1900 Nm3 The process exhaust temperature is 450-500°C, and the process heating temperature is 900-950°C. The feed amount needs to meet the feed requirement of the carbonization furnace 1, and in general, the feed amount of the carbonization furnace 1 needs to meet not less than 30% of the maximum feed amount.

[0059] Example Two:

[0060] In order to facilitate the control of the transfer amount of the combustible gas, the biomass charcoal production system of the present embodiment further refines the structure and function of the combustible gas transfer pipeline system 5 and the combustible gas self-provided pipeline system 4 on the basis of the first embodiment.

[0061] The combustible gas transfer pipeline system 5 includes a communication pipeline 51, and a first stop valve 52 arranged on the communication pipeline 51;

[0062] The combustible gas self-provided pipeline system 4 includes a combustible gas pipeline 41 connecting the exhaust port 11 and the heating system 2, and a combustible gas fan 46 arranged in the combustible gas pipeline 41. One side of the combustible gas fan 46 is connected to the communication pipeline 51 and forms a three-way connection point 53. By adjusting the opening and closing of the first stop valve 52, the corresponding combustible gas pipeline 41 is connected in communication. A check valve 43 is arranged on the combustible gas pipeline 41 between the three-way connection point 53 and the exhaust port 11. The air volume of the combustible gas fan 46 is adjustable, which is used to change the proportion of the combustible gas generated by the carbonization furnace 1 that needs to be maintained to enter the communication pipeline 51.

[0063] The above-mentioned proportion is the transfer proportion of the combustible gas generated by the carbonization furnace 1 that needs to be maintained to other carbonization furnaces 1 during the shutdown process of the carbonization furnace 1 that needs to be maintained. During the shutdown process of the carbonization furnace 1 that needs to be maintained, the feed amount is gradually reduced, and the transfer proportion is simultaneously increased, so as to ensure the matching of the feed amount and the combustible gas amount of the carbonization furnace 1 to guarantee the process exhaust temperature.

[0064] A gas monitor 45 is arranged at the exhaust port 11 of the carbonization furnace 1, which is used to monitor the pressure and temperature of the combustible gas.

[0065] A flow meter 44 is arranged upstream of the combustible gas fan 46, which is used to detect the flow of the combustible gas entering the heating system 2. A concentration sensor for detecting the concentration of the combustible gas entering the heating system 2 can also be arranged. By detecting the concentration and flow of the combustible gas and accurately controlling the flow, the feed amount of the carbonization furnace 1 is matched, so as to maintain a relatively constant process heating temperature of the heating system 2, and the process exhaust temperature is controlled, thereby ensuring the quality of the product during the shutdown process.

[0066] The air volume adjustment of the combustible gas fan 46 can be adjusted by a frequency converter, thereby adjusting the transfer proportion.

[0067] Further, in order to reduce the cost of the production system, the valve is used to adjust the air volume of the gas fan 46. The adjusting valve 48 is arranged on the gas pipeline 41 on the other side of the gas fan 46, and the air volume of the gas fan 46 is adjusted by adjusting the opening and closing degree of the adjusting valve 48.

[0068] When the adjusting valve 48 is arranged on the gas pipeline 41 to adjust the transfer ratio, the adjusting valves 48 of the remaining carbonization furnaces 1 are in the fully open state, and the adjusting valve 48 of the carbonization furnace 1 which needs to be shut down for maintenance can adjust the transfer ratio of the combustible gas by adjusting the opening and closing.

[0069] Regarding the structure and function of the heating system 2, as shown in Figure 1 The heating system 2 includes the combustion chamber 22 and the air blower 25 connected to the combustion chamber 22, and the flue 21 of the combustion chamber 22 is connected to the heating cavity of the carbonization furnace 1.

[0070] The air blower 25 is a conventional accessory of the combustion chamber 22, which is used to provide oxygen required for fuel combustion and control the temperature of the flue gas in the flue 21 of the combustion chamber 22 to ensure stable process heating temperature. After the combustible gas in the exhaust port 11 is under normal pressure, the carbonization furnace 1 stops producing carbon, and the air blower 25 is used to cool the heating cavity of the target shutdown furnace, and after cooling, the shutdown maintenance such as cleaning coking can be carried out.

[0071] The amount of feed of the carbonization furnace 1 is proportional to the heat of the combustible gas, and by controlling the matching of the feed amount and the gas amount, the stable matching of the process conditions is realized, the product quality is ensured, and the specific control method can be automatically controlled by using the PLC or DCS system. This method is prior art, and will not be described in detail here.

[0072] The combustion chamber 22 is provided with the combustor 23 connected to the gas pipeline 41.

[0073] The heating system 2 is provided with the external fuel pipeline 24 for supplying external energy to the combustion chamber 22.

[0074] The heating system 2 includes the combustion chamber 22, and the combustor 23 is arranged on the combustion chamber 22 and communicates with the inner cavity of the combustion chamber 22. The gas fan 46 is a high-temperature and high-pressure booster fan, which introduces the combustible gas generated in the carbonization furnace 1 into the combustor 23 to ignite and burn in the combustion chamber 22. The combustion chamber 22 is provided with the flue 21 communicating with the flue gas inlet 13 of the heating cavity of the carbonization furnace 1, and the high-temperature flue gas generated in the combustion chamber 22 enters the heating cavity of the carbonization furnace 1 through the flue 21 and is discharged from the flue gas outlet 12 of the carbonization furnace 1. The hearth of the carbonization furnace 1 is provided with the exhaust port 11, and the combustible gas generated in the process of carbonizing biomass is discharged from the exhaust port 11.

[0075] The carbonization furnace 1 in the production process supplies the combustible gas generated by carbonization to itself through the gas self-supply pipeline system 4. In order to maintain the process exhaust temperature and the process heating temperature, the air blower 25 is usually needed to provide oxygen for the combustion chamber 22 while taking away part of the flue gas heat to maintain the process heating temperature.

[0076] When the external fuel provided by the external fuel pipeline 24 is fuel oil, the burner 23 can be a gas-oil dual-purpose type. The burner 23 is connected to the gas pipeline 41 and also connected to the external fuel pipeline 24.

[0077] When the production equipment is put into operation, external energy is used to start all carbonization furnaces 1 that need to be in production mode.

[0078] Regarding the specific structure of the gas transfer pipeline system 5, as shown in Figure 1 When the carbonization furnace 1 is two, the communication pipeline 51 is one pipeline; as shown in Figure 4 When N is greater than or equal to three, the communication pipeline 51 includes a main pipe 511 and multiple branch pipes 512 connected to the main pipe 511. The branch pipe 512 corresponds to one carbonization furnace 1, and a first stop valve 52 is arranged on each branch pipe 512.

[0079] The communication pipeline 51 or the branch pipe 512 is connected to the gas pipeline 41 to form a three-way connection point 53, which is a three-way pipe fitting of the connection pipeline.

[0080] The gas pipeline 41 corresponding to each carbonization furnace 1 is provided with a three-way connection point 53, and the three-way connection points 53 are connected through the communication pipeline 51. The gas pipeline 41 corresponding to the carbonization furnace 1 is communicated by opening the first stop valve 52, and the transfer of combustible gas at the three-way connection point 53 is realized. The check valve 43 is used to prevent combustible gas from entering the carbonization furnace 1 from the exhaust port 11.

[0081] The second stop valve 42 and the third stop valve 47 are arranged on the gas pipeline 41 between the three-way connection point 53 and the heating system 2. The second stop valve 42 is located on the inlet side of the gas blower 46 and is used for pressure accumulation before the gas blower 46 is started. The third stop valve 47 is located on the outlet side of the gas blower 46 and is a pneumatic quick-closing valve, which is used for quickly cutting off the combustible gas in emergency situations.

[0082] In the above embodiment, if all carbonization furnaces 1 need to be shut down, they can be shut down one by one. For the last carbonization furnace 1, the air blower 25 is used to introduce excess cold air into the combustion chamber 22 to reduce the temperature of the flue gas discharged from the combustion chamber 22, reduce the heating of the carbonization furnace 1, thereby reducing the temperature of the material in the carbonization furnace 1, reducing the gas yield, and achieving shutdown.

[0083] The production system used in the biomass carbon production can set a gas storage tank for emergency storage of combustible gas generated by the shutdown of the carbonization furnace 1 without setting a flare.

[0084] Example three:

[0085] On the basis of the above examples, the number of carbonization furnaces 1 is different, the transfer mode of the combustible gas generated during the shutdown process is different, and the effect of realizing continuous production is different. In the biomass carbon production system of the present example, N is greater than or equal to two, one carbonization furnace 1 is in standby mode, and the remaining carbonization furnaces 1 are in production mode;

[0086] When one carbonization furnace 1 in production mode needs to be shut down for maintenance, the gas transfer pipeline system 5 will communicate the heating system 2 of the carbonization furnace 1 that needs to be shut down for maintenance with the heating system 2 of the carbonization furnace 1 in standby mode, and transfer the combustible gas generated during the shutdown process to the heating system 2 of the carbonization furnace 1 in standby mode for combustion, which is used for starting the carbonization furnace 1 in standby mode.

[0087] The carbonization furnace 1 in standby mode refers to one carbonization furnace 1 that is in a shutdown state during normal production. When the carbonization furnace 1 in production mode needs to be shut down, it is the target shutdown furnace, and the carbonization furnace 1 in standby mode starts to be started as the target startup furnace, and then the mode switching of the target shutdown furnace and the target startup furnace is performed.

[0088] When the carbonization furnace 1 in standby mode completes the startup, one carbonization furnace 1 in production mode completes the shutdown, and the mode switching of the two carbonization furnaces 1 is completed, ensuring that there is always one carbonization furnace 1 in standby mode in the production system.

[0089] During the mode switching process, the combustible gas generated during the shutdown process of the target shutdown furnace is transferred to the heating system 2 of the target startup furnace for combustion to provide heat for the startup of the target startup furnace; after the mode switching is completed, the target shutdown furnace is in standby mode and the target startup furnace is in production mode.

[0090] During the mode switching process, the feed amount of the target shutdown furnace (the carbonization furnace 1 shut down for maintenance) is gradually reduced, and the transfer proportion of the combustible gas generated by the target shutdown furnace is increased synchronously,

[0091] During the mode switching process, the feed amount of the target shutdown furnace (the carbonization furnace 1 shut down for maintenance) is reduced, and the feed amount of the target startup furnace (the carbonization furnace 1 in standby state) is gradually increased, so that the combustible gas temperature of the exhaust port 11 of the target shutdown furnace and the target startup furnace is the process exhaust temperature.

[0092] During the mode switching process, the transfer proportion of the combustible gas is gradually increased until the combustible gas of the exhaust port 11 of the target shutdown furnace is at normal pressure, and the transfer proportion of the combustible gas generated by the target shutdown furnace is 100%.

[0093] During the mode switching process, the total feed amount of the target deactivated furnace and the target activated furnace is equal to the feed amount of one carbonization furnace 1 in production mode during the production process.

[0094] Even when the feed is stopped, the target decommissioned furnace continues to undergo carbonization, consuming internal materials. During this process, part of the combustible gas generated in the target decommissioned furnace is used for its own heating, and part is transferred to the combustion chamber 22 of the target start-up furnace. When the combustible gas at the exhaust port 11 of the target decommissioned furnace is at atmospheric pressure, the transfer ratio of the combustible gas generated by the target decommissioned furnace is 100%. At this time, the target decommissioned furnace stops producing carbon, and the target start-up furnace fully utilizes the combustible gas it generates for carbonization, thus completing the mode switch.

[0095] Once the combustible gas at the exhaust port 11 of the target decommissioned furnace reaches atmospheric pressure, a blower 25 is used to cool the heating chamber of the target decommissioned furnace. The fact that the combustible gas at the exhaust port 11 of the target decommissioned furnace is at atmospheric pressure indicates that carbonization furnace 1 has stopped carbonizing.

[0096] Adding a carbonization furnace 1 to the production system allows one carbonization furnace 1 to serve as a backup furnace. The combustible gas generated during the shutdown of the carbonization furnace 1 that requires maintenance is supplied to the backup carbonization furnace 1 to start it up, thereby improving the utilization rate of the gas. This eliminates the need to set up a flare at the biomass charcoal production site, reducing the site requirements of the production system. At the same time, continuous biomass charcoal production can be achieved by switching between the two carbonization furnace 1 modes during the shutdown process.

[0097] By adjusting the feed rate and combustion rate of the target decommissioned furnace, the feed rate is gradually reduced and the temperature of the generated combustible gas is kept at the process exhaust temperature to ensure stable product quality. Excess combustible gas is transferred to the target activated furnace, realizing heat distribution between the target activated and target decommissioned furnaces during the mode switching process. This achieves the switching of the production capacity of the two carbonization furnaces and the continuous stability of the production system. The two specific processes of mode switching are described below.

[0098] First scenario:

[0099] There are two carbonization furnaces, such as Figures 1-3 As shown, when a carbonization furnace 1 is added to a single carbonization furnace 1 without using a flare, the amount of carbon generated by the carbonization furnace 1 during the shutdown process gradually decreases, while the amount of carbon generated by the standby furnace during the startup process gradually increases. This can maintain the total output of the production system higher than the carbon output of a single carbonization furnace 1 during the shutdown process during mode switching, and can ensure the relative stability of the overall carbon output of the production system.

[0100] Figure 1 This indicates that during the production process, carbonization furnace #1 is in production mode, while carbonization furnace #2 is in standby mode.

[0101] Figure 2Indicates the mode switching process, 1# carbonization furnace 1 is the target of the disabled furnace, 2# carbonization furnace 1 is the target of the enabled furnace.

[0102] In the early stage of mode switching, when the feed amount of 1# carbonization furnace 1 (target disabled furnace) is 70%, and the feed amount of 2# carbonization furnace 1 (target enabled furnace) is 30%, the opening degree of the regulating valve 48 of 1# carbonization furnace 1 is reduced, so that part of the combustible gas during the shutdown process of 1# carbonization furnace 1 is used for self-heating, and part of it is used for the start-up of 2# carbonization furnace 1, and the regulating valve 48 of 2# carbonization furnace 1 is in the fully open state.

[0103] In the middle stage of mode switching, when the feed amount of 1# carbonization furnace 1 (target disabled furnace) is 50%, and the feed amount of 2# carbonization furnace 1 (target enabled furnace) is 50%, the opening degree of the regulating valve 48 of 1# carbonization furnace 1 is continuously reduced, and compared with the early stage of mode switching, the proportion of the combustible gas generated by 1# carbonization furnace 1 transferred to 2# carbonization furnace 1 is increased.

[0104] In the late stage of mode switching, when the feed amount of 1# carbonization furnace 1 (target disabled furnace) is 30%, and the feed amount of 2# carbonization furnace 1 (target enabled furnace) is 70%, the proportion of the combustible gas generated by 1# carbonization furnace 1 transferred to 2# carbonization furnace 1 is further increased.

[0105] In the final stage of mode switching, 1# carbonization furnace 1 (target disabled furnace) stops feeding, and the feed amount of 2# carbonization furnace 1 is 100%. When the combustible gas at the exhaust port 11 of 1# carbonization furnace 1 is at normal pressure, the regulating valve 48 of 1# carbonization furnace 1 is closed. At this time, 1# carbonization furnace 1 stops producing carbon, and 1# carbonization furnace 1 can be cooled and maintained. 2# carbonization furnace 1 is in a production state, as shown in the figure. Figure 3 After the mode switching is completed, 1# carbonization furnace 1 is in standby mode, and 2# carbonization furnace 1 is in production mode.

[0106] The mode switching process takes about 2-3 hours, which is the shutdown time.

[0107] The second case:

[0108] When the number N of carbonization furnaces 1 is greater than or equal to three, the maintenance period of each carbonization furnace 1 is set to be the same, and the maintenance time points are staggered to avoid each other. The time interval between adjacent maintenance time points is greater than or equal to the shutdown time of each carbonization furnace 1.

[0109] Figure 4 Indicates the production process, 1# 2# carbonization furnace 1 is in production mode, and 3# carbonization furnace 1 is in standby mode.

[0110] Figure 5 Indicates the mode switching process, 1# carbonization furnace 1 is the target of the disabled furnace, 3# carbonization furnace 1 is the target of the enabled furnace, and 2# carbonization furnace 1 is in production mode.

[0111] Figure 7 Indicates that after the mode switching is completed, the 1# carbonization furnace 1 is in standby mode, and the 2# and 3# carbonization furnaces 1 are in production mode.

[0112] The process system adopts a multi-use standby scheme, which is more secure and reliable than a one-use standby scheme, is suitable for control, and makes the production capacity of the entire production system more stable.

[0113] Figure 6 Indicates a state in the mode switching process. According to the control requirements of the process exhaust temperature, at least one carbonization furnace 1 in production mode supplies combustible gas to the target start-up furnace.

[0114] The supply refers to intermittent supply according to requirements. Through temperature and other parameter monitoring during the target start-up start-up process, it can be judged whether the heating conditions after the transfer of combustible gas meet the heat requirements of the target start-up furnace start-up. If not, the combustible gas of the 2# carbonization furnace 1 in the production process can be supplied to the combustion chamber 22 of the 3# carbonization furnace 1 (target start-up furnace). The distribution of the amount of combustible gas in the entire production system is more conducive to achieving the balance between physical quantities and chemical quantities between heat and material quantity. The process fluctuation of the entire production system is small, and the quality of carbon products is reliably guaranteed.

[0115] During the mode switching process, according to the control requirements of the process exhaust temperature, at least one carbonization furnace 1 in production mode supplies combustible gas to the target start-up furnace. At least three carbonization furnaces 1 are connected through gas pipelines 41, as shown in Figure 6 The supply of combustible gas can be realized by reducing the opening degree of the corresponding regulating valve 48 of the carbonization furnace 1 in production mode and simultaneously opening the first stop valve 52 corresponding to the carbonization furnace 1 in production mode. After the supply is completed, the first stop valve 52 corresponding to the carbonization furnace 1 in production mode is closed, and the corresponding regulating valve 48 is fully opened.

[0116] Example Four:

[0117] Based on the above examples, the number of carbonization furnaces 1 is different, the transfer mode of the combustible gas generated during the shutdown process is different, and the effect of realizing continuous production is different. In the biomass carbon production system of this embodiment, as shown in Figure 8 , N is greater than or equal to three. When one carbonization furnace 1 needs to be shut down for maintenance, the remaining carbonization furnaces 1 are in production mode. The gas transfer pipeline system 5 connects the heating system 2 of the carbonization furnace 1 that needs to be shut down for maintenance with the heating systems 2 of multiple carbonization furnaces 1 in production mode.

[0118] The rated gas production capacity of each carbonization furnace 1 is Q, and the rated combustion capacity of the heating system 2 of each carbonization furnace 1 is q, which is greater than or equal to N×Q / (N-1).

[0119] The production system in the embodiment realizes a production mode of increasing production capacity. When the number of the carbonization furnaces 1 is four, three burners 23 can burn the combustible gas generated by four carbonization furnaces 1 to realize maximum production capacity, and one carbonization furnace 1 can be shut down for maintenance. The rated combustion capacity q is the rated combustion capacity of the burner 23. When one carbonization furnace 1 is shut down for maintenance and the combustible gas is transferred to the heating system 2 of another carbonization furnace 1 in the production mode, the feeding amount of the carbonization furnace 1 in the production mode can be increased correspondingly.

[0120] By increasing the rated combustion capacity of the heating system 2, the combustible gas generated during the shutdown of one carbonization furnace 1 can be consumed by multiple carbonization furnaces 1 in the production mode during production, so that the production capacity of the production system can be maximized under the condition that the carbonization furnaces 1 can be shut down for maintenance.

[0121] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined in the claims. Within the protection scope of the utility model, any form of modification can be made.

Claims

1. A biomass-to-char production system, characterized by: The invention relates to a carbonization furnace system comprising, a plurality of carbonization furnaces (1), the number of which is N; a plurality of heating systems (2) corresponding to the carbonization furnaces (1) one by one; a plurality of gas self-sufficient pipeline systems (4) corresponding to the carbonization furnaces (1) one by one, connecting the exhaust ports (11) of the carbonization furnaces (1) and the heating systems (2); a gas transfer pipeline system (5) connecting the plurality of gas self-sufficient pipeline systems (4); wherein when one carbonization furnace (1) in production mode needs to be shut down for maintenance, the gas transfer pipeline system (5) connects the gas self-sufficient pipeline system (4) of the carbonization furnace (1) that needs to be shut down for maintenance with the heating system (2) of another carbonization furnace (1), and transfers the combustible gas generated during the shutdown process to the heating system (2) of the other carbonization furnace (1) for combustion.

2. The biomass carbonization production system of claim 1, wherein: The gas transfer pipeline system (5) comprises a communication pipeline (51) and a first stop valve (52) arranged on the communication pipeline (51); The gas self-sufficient pipeline system (4) comprises a gas pipeline (41) connecting the exhaust port (11) and the heating system (2), and a gas fan (46) arranged in the gas pipeline (41). One side of the gas fan (46) is connected with the communication pipeline (51) to form a three-way connection point (53). By adjusting the opening and closing of the first stop valve (52), the corresponding gas pipeline (41) is connected. A check valve (43) is arranged on the gas pipeline (41) between the three-way connection point (53) and the exhaust port (11). The air volume of the gas fan (46) can be adjusted to change the proportion of the combustible gas generated by the carbonization furnace (1) that needs to be shut down for maintenance entering the communication pipeline (51).

3. The biomass carbonization production system of claim 2, wherein: An adjusting valve (48) is arranged on the gas pipeline (41) on the other side of the gas fan (46). By adjusting the opening and closing degree of the adjusting valve (48), the air volume of the gas fan (46) can be adjusted.

4. The biomass carbonization production system of claim 2, wherein: The heating system (2) comprises a combustion chamber (22) and a blower (25) connected to the combustion chamber (22). The flue (21) of the combustion chamber (22) is connected to the heating cavity of the carbonization furnace (1).

5. The biomass carbonization production system of claim 4, wherein: A burner (23) connected to the gas pipeline (41) is arranged on the combustion chamber (22).

6. The biomass carbonization production system of claim 4, wherein: The heating system (2) is provided with an external fuel pipeline (24) for supplying external energy to the combustion chamber (22).

7. The biomass carbonization production system according to any one of claims 2 to 6, wherein: N is greater than or equal to two. One carbonization furnace (1) is in standby mode, and the remaining carbonization furnaces (1) are in production mode. When one carbonization furnace (1) in production mode needs to be shut down for maintenance, the gas transfer pipeline system (5) connects the heating system (2) of the carbonization furnace (1) that needs to be shut down for maintenance with the heating system (2) of the carbonization furnace (1) in standby mode, and transfers the combustible gas generated during the shutdown process to the heating system (2) of the carbonization furnace (1) in standby mode for combustion, which is used for starting the carbonization furnace (1) in standby mode.

8. The biomass carbonization production system according to any one of claims 2 to 6, wherein: N is greater than or equal to three, when one carbonization furnace (1) needs to be shut down for maintenance, the remaining carbonization furnaces (1) are in production mode, and the gas transfer pipeline system (5) is connected with the heating system (2) of the carbonization furnace (1) needing to be shut down for maintenance and the heating system (2) of the carbonization furnace (1) in production mode.

9. The biomass carbonization production system of claim 8, wherein: The rated gas production of each carbonization furnace (1) is Q, and the rated combustion of the heating system (2) of each carbonization furnace (1) is q, q is greater than or equal to N×Q / (N-1).

10. The biomass carbonization production system according to any one of claims 2-6, wherein: N is greater than or equal to three, the connecting pipeline (51) comprises a main pipe (511) and a plurality of branch pipes (512) connected with the main pipe (511), the branch pipes (512) correspond to the carbonization furnaces (1) one by one, and a first stop valve (52) is arranged on each branch pipe (512).

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