Hydrogen recycling system in indigo production process
By designing a hydrogen recovery and utilization system in the indigo production process and using hydrogen combustion to replace part of natural gas combustion, the problems of hydrogen waste and excessive CO2 emissions are solved, and the optimization of resources and the reduction of production costs are achieved.
Patent Information
- Application Number
- CN202420098103.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-13
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-01-13
AI Technical Summary
During the indigo production process, the combustion of hydrogen and natural gas leads to excessive CO2 emissions, and the hydrogen cannot be effectively recycled, resulting in waste of resources and high production costs.
A system including hydrogen recovery pipeline, hydrogen buffer tank, dryer, storage tank and burner is designed to achieve safe combustion of hydrogen through pressure sensors and regulating valves, which is used to replace part of natural gas combustion and reduce CO2 emissions.
It realizes effective recycling and utilization of hydrogen, reduces natural gas usage and CO2 emissions, reduces production costs, and realizes optimized utilization of resources.
Smart Images
Figure CN222357960U_ABST
Abstract
Description
Technical field:
[0001] The utility model relates to a hydrogen recovery and utilization system, in particular to a hydrogen recovery and utilization system in an indigo production process. Background technology:
[0002] At present, the method for manufacturing indigo is to first mix potassium (sodium) anilinoacetate and sodium amide in an alkali melting kettle to react to obtain potassium (sodium) indoxyphenol, and then send it to an oxidation kettle and blow air into it for further oxidation to obtain dioxybisindoxyphenol (i.e. indigo); wherein the process for producing sodium amide is to send ammonia gas and metallic sodium after liquid ammonia is vaporized by an evaporator to an amino pot for synthesis reaction, and the obtained sodium amide is pumped into the alkali melting kettle by a vacuum pump; hydrogen and ammonia waste gas are also generated during the synthesis reaction, and after the mixed gas passes through the ammonia absorption tower in the ammonia recovery system to absorb the ammonia, the remaining hydrogen is directly emptied, resulting in no reasonable recovery and utilization of hydrogen, resulting in waste of resources.
[0003] The obtained dioxybisindoxyphenol needs to be filtered through a product filter press to obtain an indigo filter cake. The alkali concentration of the filtrate obtained by the filtration is 14-15%, which is sent to the alkali recovery system for recovery to make a mixed alkali with a concentration of 92% for use in the hydrolysis reaction again. Finally, a dehydration pot is required to heat and dehydrate the mixed alkali with a concentration of 70% to a mixed alkali with a concentration of 92%. Currently, the heating of the dehydration pot is carried out by burning natural gas, but the burning of natural gas will emit a large amount of CO2, and it is impossible to achieve effective control of carbon emissions. Utility model content:
[0004] The utility model aims to provide a hydrogen recovery and utilization system in the indigo production process, which has a simple connection structure, realizes effective resource utilization, and reduces the production cost of the enterprise.
[0005] The utility model is implemented by the following technical scheme: The purpose of this patent is to provide a hydrogen recovery and utilization system in the indigo production process, which includes a hydrogen recovery pipeline, a hydrogen buffer tank, a hydrogen dryer, a hydrogen storage tank and a burner connected in sequence; a pressure sensor and a regulating valve are arranged in sequence on the pipeline between the hydrogen storage tank and the burner; the signal output end of the pressure sensor is connected to the signal input end of the controller through a signal, and the signal output end of the controller is connected to the signal input of the regulating valve through a signal; the burner is arranged on the combustion chamber of the dehydration pot.
[0006] Furthermore, the burner includes an outer shell, an inner tube and an ignition nozzle; one end of the outer shell is fixed to the side wall of the combustion chamber of the dehydration pot, an ignition nozzle is arranged at one end of the outer shell close to the combustion chamber, and the other end of the outer shell is connected to the natural gas pipeline; the inner tube is arranged in the outer shell, and the end of the inner tube away from the ignition nozzle passes through the outer shell and is connected to the air outlet of the hydrogen storage tank; a combustion-supporting air duct is also arranged on the outer shell.
[0007] Furthermore, a throttle hole plate is arranged at one end of the inner tube close to the ignition nozzle.
[0008] Advantages of the utility model: The utility model has a simple connection structure and is easy to implement. By recovering hydrogen and sending it to the dehydration pot as fuel gas for combustion, waste of hydrogen is avoided, thereby achieving effective utilization of resources; at the same time, the use of natural gas is reduced, thereby reducing the production cost of the enterprise. Description of the drawings:
[0009] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0011] Hydrogen recovery pipeline 1, hydrogen buffer tank 2, hydrogen dryer 3, hydrogen storage tank 4, burner 5, outer shell 51, inner tube 52, ignition nozzle 53, throttle orifice plate 54, pressure sensor 6, regulating valve 7, controller 8, combustion chamber 9, natural gas pipeline 10, combustion-supporting air duct 11. Specific implementation method:
[0012] Example: Figure 1 As shown, a hydrogen recovery and utilization system in an indigo production process comprises a hydrogen recovery pipeline 1, a hydrogen buffer tank 2, a hydrogen dryer 3, a hydrogen storage tank 4 and a burner 5 which are connected in sequence; a pressure sensor 6 and a regulating valve 7 are arranged in sequence on the pipeline between the hydrogen storage tank 4 and the burner 5; the signal output end of the pressure sensor 6 is connected to the signal input end of a controller 8 through a signal, and the signal output end of the controller 8 is connected to the signal input end of the regulating valve 7 through a signal; the burner 5 is arranged on the combustion chamber 9 of the dehydration pot.
[0013] The burner 5 includes an outer shell 51, an inner tube 52 and an ignition nozzle 53; one end of the outer shell 51 is fixed on the side wall of the combustion chamber 9 of the dehydration pot, and the ignition nozzle 53 is arranged at the end of the outer shell 51 close to the combustion chamber 9, and the other end of the outer shell 51 is connected with the natural gas pipeline 10; an inner tube 52 is arranged in the outer shell 51, and the end of the inner tube 52 away from the ignition nozzle 53 passes through the outer shell 51 and is connected with the outlet of the hydrogen storage tank 4; a throttle orifice plate 54 is arranged at the end of the inner tube 52 close to the ignition nozzle 53, which is used to limit the flow and control the pressure of hydrogen to avoid the danger caused by the high pressure of hydrogen entering the ignition nozzle 53; a combustion-supporting air duct 11 is also connected to the outer shell 51.
[0014] Working principle: The hydrogen separated from the ammonia absorption tower is sent to the hydrogen buffer tank 2 for buffering through the hydrogen recovery pipeline 1, and then sent to the hydrogen dryer 3 for drying and dehydration. After that, the dry hydrogen is sent to the hydrogen storage tank 4 as fuel gas and mixed with natural gas to burn for heating the dehydration pot; the pressure sensor 6 constantly detects the hydrogen pressure in the outlet pipeline of the hydrogen storage tank 4 and transmits the signal to the controller 8. The controller 8 adjusts the opening size of the regulating valve 7 according to the size of the hydrogen pressure to ensure safe combustion.
[0015] The connection structure of the utility model is simple and easy to implement. The use effect of the system of the utility model is good after it is put into use, and the system equipment and facilities operate normally. According to statistics, it saves 8 million yuan / year in natural gas costs and reduces hydrogen emissions by 29.2t / year, thus achieving effective utilization of resources; at the same time, it reduces the use of natural gas, reduces the amount of CO2 generated by combustion, achieves effective control of carbon emissions, and reduces the production costs of enterprises.
[0016] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A hydrogen recovery and utilization system in an indigo production process, characterized in that: It includes a hydrogen recovery pipeline, a hydrogen buffer tank, a hydrogen dryer, a hydrogen storage tank and a burner which are connected in sequence; a pressure sensor and a regulating valve are arranged in sequence on the pipeline between the hydrogen storage tank and the burner; the signal output end of the pressure sensor is connected to the signal input end of the controller through a signal, and the signal output end of the controller is connected to the signal input end of the regulating valve through a signal; the burner is arranged on the combustion chamber of the dehydration pot.
2. The hydrogen recovery and utilization system in the indigo production process according to claim 1, characterized in that: The burner includes an outer shell, an inner tube and an ignition nozzle; one end of the outer shell is fixed to the side wall of the combustion chamber of the dehydration pot, an ignition nozzle is arranged at one end of the outer shell close to the combustion chamber, and the other end of the outer shell is connected to the natural gas pipeline; the inner tube is arranged in the outer shell, and the end of the inner tube away from the ignition nozzle passes through the outer shell and is connected to the air outlet of the hydrogen storage tank; a combustion-supporting air duct is also arranged on the outer shell.
3. The hydrogen recovery and utilization system in the indigo production process according to claim 2, characterized in that: A throttle hole plate is arranged at one end of the inner tube close to the ignition nozzle.