CN102720575A - Aftertreatment control unit for storing and supplying ammonia by single-stage waste heat method - Google Patents

Abstract

The invention relates to a post-processing control unit for ammonia storage and supply in a single-stage waste heat mode, which is characterized in that: the signal output end of the electronic control unit is connected with a solenoid valve and a proportional valve through a signal line, a pressure sensor, a pressure tank temperature sensor, an exhaust gas The inlet temperature sensor and NO _X sensor are connected to the signal input end of the electronic control unit. The antifreeze liquid delivery pipe is located in the inner part of the pressure tank and presents a coil distribution. The pressure tank is filled with solid ammonia storage material, and the sensing end of the pressure tank temperature sensor is inserted into a solid In the ammonia storage material, the sensing end of the pressure sensor is located in the pressure tank but not in contact with the solid ammonia storage material. The air filter is connected to the reducing agent conduit through the reducing gas delivery pipe, and the nozzle end of the reducing agent conduit penetrates the tail gas into the pipe. The valve is located on the reducing gas delivery pipeline. The exhaust gas inlet temperature sensor and the sensing end of the NO _X sensor are probed into the exhaust gas inlet pipeline. The exhaust gas inlet tube is connected to the inlet port of the SCR post-processor, and the outlet port of the SCR post-processor is connected to the exhaust gas outlet. tube; it uses a composition composed of active materials, porous materials and binders as the carrier for ammonia storage and release; it improves the efficiency of charging and discharging ammonia, simplifies the system, improves reliability, and greatly reduces costs, eliminating Barriers to large-scale industrial application.

Description

Post-processing control unit for ammonia storage and supply in single-stage waste heat mode

technical field

The invention relates to a post-processing control unit for ammonia storage and supply in a single-stage waste heat mode, which is applied to the SCR post-processing industry of automobile exhaust, and is also suitable for FCEV energy storage systems of fuel cells.

Background technique

At present, the world is facing comprehensive challenges of energy and environment. In terms of the selection of technical means to meet the emission standards of traditional vehicles, people still face many difficulties, for example, how to choose the technical means of after-treatment and so on.

SCR (Selective Catalytic Reduction) catalytic conversion reduction technology is a traditional post-treatment technology. The essence of this traditional SCR technology using liquid urea is to use urea to decompose ammonia at high temperature, ammonia as a reducing agent and NOX in engine exhaust react under the combined action of catalyst and temperature, and generate Non-toxic N ₂ and H ₂ O, so as to achieve the purpose of purification.

Traditional SCR has many advantages, for example, it can have 50~85% NOX removal efficiency in the range of exhaust temperature 250~550oC, and can effectively reduce PM emission level; traditional SCR can easily meet Euro 4 and Euro 5 It also has the potential to reach the level of Euro 6; the traditional SCR technology currently used in Euro 4 can reduce the fuel consumption of the engine by 3~6%; the traditional SCR catalyst does not contain precious metals, and the specific cost is relatively low; the traditional SCR It is not sensitive to the quality of motor fuel, especially the sulfur content. Based on the above analysis, the traditional SCR post-processing technology is also more suitable for China's vehicle conditions and vehicle fuel conditions.

If the traditional vehicle-mounted SCR post-treatment technology is to be promoted and applied in China, it is necessary to properly address the carrier, catalyst, urea reductant supply network, dosage of urea reductant, atomized injection of urea reductant, SCR catalyst conversion efficiency, and ammonia leakage. And crucial technical difficulties such as system matching.

Every upgrade of the emission standards of motor vehicles has an impact effect on the automobile industry in one way or another. The delayed implementation of China's national 4 standards is not only the only reason for the asynchronous fuel standards, but also the complex social support system and the construction of socialized service facilities for liquid urea reducing agents. For example, national 4 After the implementation of the standard, there will be a demand for the ECU (control unit) and DCU (metering unit) required for the operation of the traditional SCR system immediately. Considering that the current vehicle ECU and other electronic control systems are imported products, the DCU independently developed by domestic enterprises It is difficult to communicate with it. On the contrary, if 100% of the ECU and DCU systems are imported, not only the price is high, which is difficult for users to accept, but also there is a problem of very tight supply, and it also faces complex after-sales service technology and cost constraints. Problems have restricted the development and progress of the entire automotive industry. In addition, the liquid urea reductant used in the traditional SCR system faces the problems of freezing in winter and thawing with heat preservation, which also causes the complexity and poor stability of the traditional SCR system.

Therefore, how to obtain a low-cost and high-performance post-processing system is the core content of promoting technological progress in this field. The adsorption and desorption characteristics of inorganic salts to ammonia can be used as a good technical choice for future SCR systems.

Some salts of industrial grade, for example, chlorides such as strontium chloride, magnesium chloride or calcium chloride and their mixtures, the system used in conjunction with ammonia, that is, the endothermic and exothermic process of the above-mentioned chloride and ammonia adsorption and desorption process Phenomenon, it has been maturely applied to the refrigeration system of large-scale cold storage in industry.

The chemical adsorption of the above-mentioned anhydrous chloride and ammonia is a common chemical principle. In theory, one molecule of chloride can adsorb 6-8 molecules of ammonia to form a stable complex. In-depth, it was found that the adsorption and desorption models and chemical principles of these chlorides and ammonia can be fully applied to the SCR system for the purification of motor vehicle exhaust.

In the national patent information network, search with ammonia storage as the subject word, the patent number is CN201120099229.7 'A device for recovering ammonia from urotropine tail gas by gas phase method', and the patent number is CN201020677361.7 'Used for cold storage room distribution The ammonia connecting mechanism' and the 'composite functional ammonia storage device' with patent number CN201020269811.9 are not related to the characteristic components of the present invention. Patent No. CN200520057558.X's patent of 'an ammonia distillation device' is a kind of environmental protection treatment device for ammonia nitrogen discharge treatment of ammonia nitrogen industrial wastewater, and does not involve the characteristic components in the present invention. Not relevant to the present invention.

The two inventions of the patent application number CN201010244091.5 'for checking the operation of SCR catalyst' and the patent number CN200880104697.X 'operation method and diagnosis method of SCR exhaust aftertreatment system' provide An ammonia dosing module and control system for selective catalytic reduction (SCR) catalytic converters and conventional liquid urea splitting, without reference to the characteristic components of the present invention.

The patent application number is CN200910197860.8, the invention of 'a preparation method of high-efficiency low-temperature ammonia storage material' is applied to the SCR post-treatment system, and the feature is that the aminoborane ammonia complex ammonia BH3(NH3)n (n=1~ 3) The maximum ammonia storage capacity at room temperature can reach 62.4wt%. However, considering that aminoborane is expensive and has high explosion and combustion grades, it is not suitable for mass promotion and application in general industrial fields.

The patent application No. CN200580026626.9 'A solid material for storing and transporting ammonia' relates to a solid material for storing and transporting ammonia. The ammonia-storing solid material includes M _a (NH3) _n X _z ionic salt, and the salt solid material is directly molded by high pressure through a mold, for example, made into a cylinder, and then many such cylinders are arranged together. The biggest disadvantage of this patent is that the cylindrical body is too dense, and it takes a long time to perform saturated adsorption of ammonia after each ammonia desorption is completed, such as 4~6 hours, and the efficiency is very low, which is very low for the SCR ammonia storage system used in automobiles. It is very inconvenient, and becomes the reason for limiting its application.

The patent application number is CN200580009219.7 " _Application of _ammonia storage device in energy production". in the fuel cell system. In claim 4 of the patent, it is mentioned that the characteristic substance is the type of salt or located on a porous carrier material, but it does not declare what kind of porous material it is, and those skilled in the art cannot implement it.

The patent application number is CN200710156866.1, the invention of 'an amino complex and its preparation method and application' discloses an amino complex, its preparation method and application. The composition of the amino complex is MX _m (NH3) _n , and the invention is used for the separation of ammonia in the circulating gas used in the ammonia synthesis process. The claims only relate to the preparation process of the amino metal complex.

Patent application number CN200680005886.2 for 'High Density Storage of Ammonia' contains solid ammonia storage and delivery materials of ammonia absorbing/desorbing solid materials that have been compacted to a density greater than 50% of the theoretical skeletal density for storage and The conveying material provides a solid ammonia storage material. The metal salt solid material described in this patent is also directly molded. It is stated that a binder is used. It only states that a silica fiber binder may be used, and there is no addition ratio , without clearly stating the details of other ingredients used, it is almost impossible for skilled personnel in this field to implement.

The retrieval and analysis of the above-mentioned patents show that the use of active ammonia storage compounds to adsorb and decompose ammonia to form an aftertreatment system applied to vehicles has not been reported yet.

Contents of the invention

The object of the present invention is to provide a post-processing control unit for ammonia storage and supply in a single-stage waste heat mode, which uses a composition composed of active materials, porous materials and binders as the carrier for ammonia storage and release; engine coolant Relying on the control unit and a set of solenoid valves or proportional valves, the dosage of ammonia can be delivered and easily introduced into the SCR post-treatment system to realize the removal of NOX; the efficiency of ammonia charging and discharging is improved, the system is simplified, and the reliability is improved. It also greatly reduces costs and eliminates obstacles to large-scale industrial promotion and application.

The technical solution of the present invention is achieved in the following way: a post-processing control unit for ammonia storage and supply in a single-stage waste heat mode, which consists of an engine, an antifreeze delivery pipe, a solenoid valve, a pressure tank, a solid ammonia storage material, an air filter, Feeding port, pressure sensor, spare pipe valve, pressure tank temperature sensor, reducing gas delivery pipe, electronic control unit, proportional valve, exhaust gas inlet temperature sensor, NOX sensor, reducing agent conduit, exhaust gas inlet pipe, exhaust gas discharge pipe, after SCR Composed of a processor, it is characterized in that: the signal output end of the electronic control unit is connected with the solenoid valve and the proportional valve through the signal line, and the pressure sensor, the pressure tank temperature sensor, the exhaust gas inlet temperature sensor, and the NOX sensor are input with the electronic control unit signal through the signal line The antifreeze delivery pipe is connected in series or in parallel with the antifreeze system of the engine. The antifreeze delivery pipe passes through the pressure tank. The antifreeze delivery pipe is located inside the pressure tank and presents a coil distribution. On the pipeline, the pressure tank is filled with 40% of the volume capacity of the solid ammonia storage material tank, and the top of the pressure tank is equipped with an air filter, a feeding port, a pressure sensor, a spare pipe valve, and a pressure tank temperature sensor. The sensing end of the temperature sensor is inserted into the solid ammonia storage material, the sensing end of the pressure sensor is located in the pressure tank but not in contact with the solid ammonia storage material, the air filter is connected to the reducing agent conduit through the reducing gas delivery pipe, and the nozzle end of the reducing agent conduit is inserted The exhaust gas enters the pipe, the proportional valve is located on the reducing gas delivery pipeline, the exhaust gas inlet temperature sensor and the NOX sensor are connected to the exhaust gas inlet pipe, the sensing end of the exhaust gas inlet temperature sensor and the NOX sensor is inserted into the exhaust gas inlet pipe, and the exhaust gas enters The pipe is connected to the inlet end of the SCR after-processor, and the outlet end of the SCR after-processor is connected to the exhaust pipe.

The preparation and filling method of the described solid ammonia storage material is as follows: adopt 58 parts by weight of industrial anhydrous magnesium chloride, 2 parts of expanded graphite, 15 parts of deionized water, 10 parts of industrial ethanol and 15 parts of industrial ball clay, through mechanical The dough mixer is used to stir evenly into wet powder. The mixing time is 5-15 minutes. Fill it into the pressure tank through the feeding port. Vibrate the pressure tank body by mechanical vibration for 5-10 minutes to remove the air gap. The solid ammonia storage material can be filled to 40% of the volume capacity of the tank; the whole tank is placed in a vacuum oven, heated from room temperature 25°C under normal pressure, with an average temperature of 5°C/10min, and the temperature is raised to 70°C, and the feed is opened during heating Exhaust water vapor and alcohol vapor from the outlet, keep at 70°C for 30 minutes, then start the vacuum pump at 70°C, gradually evacuate, and make the vacuum degree reach 550mabr three times, and keep the temperature and pressure for 30 minutes.

The anhydrous magnesium chloride can also be replaced by other inorganic salts that can form complexes, such as strontium chloride, nickel chloride, copper chloride or calcium chloride that can form complexes with NH3.

The pressure tank is a pressure tank body made of stainless steel, the thickness of the tank body is 4-5 mm, cylindrical, and a nylon insulation layer is thermally sprayed inside the tank body.

The positive effect of the present invention is that after completing one ammonia charging, the mileage of the vehicle can be guaranteed to be 20,000-40,000 km, the efficiency of ammonia charging and discharging is improved, the system is simplified, the reliability is improved, and the cost is also greatly reduced, which has high practicality. sex, economy and advancement.

Description of drawings

Fig. 1 is the accompanying drawing of the present invention.

Detailed ways

The present invention will be further described below by accompanying drawings and embodiments: As shown in Fig. Pressure tank 4, solid ammonia storage material 5, air filter 6, feeding port 7, pressure sensor 8, spare pipe valve 9, pressure tank temperature sensor 10, reducing gas delivery pipe 11, electronic control unit 12, proportional valve 13, Exhaust gas inlet temperature sensor 14, NOX sensor 15, reducing agent conduit 16, exhaust gas inlet pipe 17, exhaust gas discharge pipe 18, SCR post-processor 19, is characterized in that: the signal output end of the electronic control unit 12 passes through the signal line and the solenoid valve 3 , the proportional valve 13 is connected, the pressure sensor 8, the pressure tank temperature sensor 10, the exhaust gas inlet temperature sensor 14, the NOX sensor 15 are connected with the signal input end of the electronic control unit 12 through the signal line, and the antifreeze liquid delivery pipe 2 is connected with the antifreeze liquid of the engine 1 The system is connected in series or in parallel, the antifreeze delivery pipe 2 passes through the pressure tank 4, the antifreeze delivery pipe 2 is located inside the pressure tank 4 and presents a coil distribution, the solenoid valve 3 is located on the antifreeze delivery pipe 2, and the pressure resistance The tank 4 is filled with 40% of the solid ammonia storage material 5 tank volume capacity, and the top of the pressure tank 4 has an air filter 6, a feeding port 7, a pressure sensor 8, a spare pipe valve 9, and a pressure tank temperature sensor 10. The sensing end of the pressure tank temperature sensor 10 is inserted into the solid ammonia storage material 5, the sensing end of the pressure sensor 8 is located in the pressure tank 4 but not in contact with the solid ammonia storage material 5, the air filter 6 is connected to the reducing agent conduit through the reducing gas delivery pipe 11 16 connection, the nozzle end of the reducing agent conduit 16 probes into the exhaust gas inlet pipe 17, the proportional valve 13 is located on the reducing gas delivery pipe 11, the exhaust gas inlet temperature sensor 14 and the NOX sensor 15 are connected to the exhaust gas inlet pipe 17, and the exhaust gas inlet temperature sensor 14. The sensing end of the NOX sensor 15 is probed into the exhaust gas inlet pipe 17, the exhaust gas inlet pipe 17 is connected to the inlet end of the SCR post-processor 19, and the outlet end of the SCR post-processor 19 is connected to the exhaust gas discharge pipe 18.

The preparation and filling method of the described solid ammonia storage material 5 are as follows: adopt 58 parts of industrial anhydrous magnesium chloride in parts by weight, 2 parts of expanded graphite, 15 parts of deionized water, 10 parts of industrial ethanol and 15 parts of industrial ball clay, through The mechanical noodle mixer mixes evenly into wet powder, the mixing time is 5-15 minutes, and it is filled into the pressure tank 4 through the feeding port 7, and the pressure-resistant tank body is shaken by mechanical vibration for 5-10 minutes to remove the In the air gap, the solid ammonia storage material 5 can be filled to 40% of the volume capacity of the tank; the whole tank is placed in a vacuum oven, and heated from room temperature 25°C under normal pressure, with an average of 5°C/10min, and the temperature rises to 70°C. When heating, open the feeding port 7 to discharge water vapor and alcohol vapor, keep at 70°C for 30 minutes, then start the vacuum pump at 70°C, gradually vacuumize, and make the vacuum degree reach 550mabr in three times, heat preservation and pressure for 30 minutes;

The anhydrous magnesium chloride can also be replaced by other inorganic salts capable of forming complexes, such as strontium chloride, nickel chloride, cupric chloride or calcium chloride, etc., which can form complexes with NH3.

The pressure tank is a pressure tank body made of stainless steel, the thickness of the tank body is 4-5 mm, cylindrical, and a nylon insulation layer is thermally sprayed inside the tank body.

Example 1

Select a SUS304 plate with a thickness of 4mm and first weld it into a stainless steel barrel with an inner diameter of 300mm and a height of 330mm, complete the welding of the cooling liquid circulation pipeline and the coil, and complete the welding of the bottom. The inner wall of the barrel is thermally sprayed with nylon powder once, pay attention to heating The coil is not sprayed with nylon; the welding of the upper cover is completed, and the feeding port 7, pressure sensor 8, spare pipe valve 9, pressure tank temperature sensor 10, reducing gas delivery pipe 11 and filter 6 are completed on the upper cover, Completed the connection of the relevant parts of the pressure tank 4; pressure leak test to ensure that the sealing and welding quality meets the requirements;

Adopt 58 parts by weight of industrial anhydrous magnesium chloride, 2 parts of expanded graphite, 15 parts of deionized water, 10 parts of industrial ethanol and 15 parts of industrial ball clay to prepare 10 kg of mixture; The powder, mixed for 10 minutes, is gradually filled into the pressure tank 4 through the feeding port 7, during which the pressure tank is shaken by mechanical vibration for 5-10 minutes; the whole tank is put into a vacuum oven, and the Start heating from room temperature at 25°C, average 5°C/10min, and heat up to 70°C. When heating and drying, the feeding port 7 is open; keep at this temperature for 30 minutes, then start the vacuum pump at this temperature, gradually vacuumize, and make the vacuum three times. The temperature reaches 550 mabr, and the heat preservation and pressure are maintained for 30 minutes; the production and filling of the solid ammonia storage material 5 are completed.

Complete the pressure tank 4 of the solid ammonia storage material 5, and use the high-purity industrial ammonia bottle through the spare pipe valve 9 to fill the ammonia; carry out in a naturally ventilated environment, put the pressure tank 4 into a water volume large enough in advance. In the water tank of the cooling water, connect the ammonia steel cylinder, through the pressure reducing valve and the drying system, fill the ammonia slowly within the outlet pressure range of 0.1Mpa, and the ammonia filling time is 3h; weigh the pressure tank before and after the ammonia filling 4. Confirm that the net mass of the charged ammonia is greater than 8kg; after the ammonia is filled, the valves of the entire system are closed to ensure no leakage;

Then connect the relevant electronic control unit 12, proportional valve 13, NOX sensor 15, reducing agent conduit 16, exhaust gas inlet 17, exhaust gas outlet 18, SCR post-processor 19; and with an 8.6L National 4 engine test bench The coolant pipe is connected to the cooling system in parallel, and the above system is started. After the engine runs for 5 minutes, the system pressure is displayed as 0.15Mpa. Start the system, set the supply of ammonia gas to 90% of the theoretical demand, and start the test. The NOX conversion rate of the engine was tested under each working condition. When the ammonia leakage was less than 10ppm, the NOX conversion rate was maintained in the range of 61-87%.

The antifreeze delivery pipe 2 is mainly connected in parallel with the coolant circulation pipeline of the engine 1, and can also be used in series for light vehicles; the heating coil of the antifreeze delivery pipe 2 is a stainless steel pipe, and the pressure tank 4 tank During the preparation period, it is welded together with the tank body; the amount of antifreeze liquid flowing through the pressure tank 4 through the antifreeze delivery pipe 2 is controlled by the signal fed back from the pressure tank temperature sensor 10 to the electronic control unit 12, and it is closed when the temperature exceeds 90°C , the resolution rate of ammonia reaches the maximum value, and the excess ammonia produced in the tank cannot be consumed. At this time, the signal of the electronic control unit 12 is used to close the solenoid valve 3, stop the flow of the engine coolant, and prevent the continuous input of heat; , the SCR post-processor 19 stops working, and ammonia is no longer needed. At this time, the signal of the electronic control unit 12 is used to close the solenoid valve 3, stop the flow of the engine coolant, and prevent the continuous input of heat; in addition, when the pressure tank 4 cans When the pressure in the body exceeds the limit pressure of the pressure sensor 8 by 0.8Mpa, the solenoid valve 3 is also closed by the signal of the electronic control unit 12, and the flow of the engine coolant is stopped to prevent the continuous input of heat;

An air filter 6 is installed in the direction of the ammonia outlet on the upper part of the pressure tank 4 to ensure that the inorganic powder in the tank will not enter the pipeline system and block precision devices; the tank body is tightened after the solid ammonia storage material 5 is added to the feed port 7 ; The pressure sensor 8 is also an automatic pressure limiting valve to ensure the automatic pressure relief of the overpressure system;

Complete the installation of spare pipe valve 9 on the tank body, the feeding of active gas and the completion of adsorption are carried out through spare pipe valve 9; high-purity industrial ammonia cylinders can be used, and in a naturally ventilated environment, considering that the adsorption of ammonia is During the exothermic process, removing the heat of the system in time is the key to ensure the rapid adsorption of ammonia. Therefore, put the pressure tank 4 in a water tank with a large enough water volume in advance, connect the ammonia cylinder, and pass through the pressure reducing valve and the drying system. Fill the ammonia slowly within the outlet pressure range of 0.02~0.2Mpa, and the ammonia filling time is 2~3h; weigh the pressure tank 4 before and after the ammonia filling, and confirm that the net mass of the filled ammonia is within the predetermined range; complete After filling ammonia, the valves of the whole system are closed to ensure no leakage;

After the pressure tank 4 is filled with ammonia, the installation position is on the side of the vehicle with the SCR post-processor 19, so as to reduce the length of the pipeline, reduce the system response time, and increase the system response sensitivity;

When the exhaust temperature of the engine or the NOX level reaches a certain level, the electronic control unit 12 controls the opening of the proportional valve 13 to realize the change in the delivery of ammonia to the SCR post-processor 19 to meet the requirements for NOX removal under different working conditions of the vehicle . the

Similarly, assemble the above system on a heavy-duty truck, and set the supply of ammonia to 80% of the theoretical demand according to the normal operation of the vehicle and the MAP map of NOX emissions of this model, and connect the coolant pipe to the cooling system in parallel , at 17,000km, the system still has ammonia supply, and the NOX conversion rate of the real vehicle measured at full load is in the range of 38-53%, which meets the design requirements.

Claims (4)

1. a single-stage waste heat mode is stored up the reprocessing control unit that ammonia supplies ammonia; Form by motor, antifreeze liquid delivery pipe, solenoid valve, autoclave, solid ammonia-storing material, air filter, charging hole, pressure transducer, subsequent use pipe valve, autoclave temperature transducer, reducing gas delivery pipe, electronic control unit, Proportional valve, gas inlet temperature transducer, NOX sensor, reducing agent conduit, tail gas entering pipe, exhaust emission tube, SCR preprocessor; It is characterized in that: the electronic control unit signal output part is connected with solenoid valve, Proportional valve through signaling line; Pressure transducer, autoclave temperature transducer, gas inlet temperature transducer, NOX sensor are connected with the electronic control unit signal input part through signaling line; Serial or parallel connection in the antifreeze liquid system of antifreeze liquid delivery pipe and motor; The antifreeze liquid delivery pipe passes from autoclave; The antifreeze liquid delivery pipe is positioned at the autoclave interior section and presents the coil pipe distribution, and solenoid valve is positioned on the antifreeze liquid delivery pipe pipeline, fills 40% of solid ammonia-storing material tank body volume capacity in the autoclave; There are air filter, charging hole, pressure transducer, subsequent use pipe valve, autoclave temperature transducer in the autoclave top; Wherein autoclave temperature sensor senses end inserts in the solid ammonia-storing material, and the pressure transducer induction end is positioned at autoclave but does not contact with the solid ammonia-storing material, and air filter is connected with the reducing agent conduit through the reducing gas delivery pipe; Reducing agent catheter nozzle end probes into tail gas and gets in the pipe pipe; Proportional valve is positioned on the reducing gas delivery pipe pipeline, and gas inlet temperature transducer, NOX sensor are connected tail gas and get on the pipe, and the induction end of gas inlet temperature transducer, NOX sensor probes into tail gas and gets in the pipe pipeline; Tail gas gets into pipe and connects SCR preprocessor inlet end, and SCR preprocessor outlet side connects exhaust emission tube.

2. store up the reprocessing control unit that ammonia supplies ammonia according to a kind of single-stage waste heat mode described in the claim 1, it is characterized in that described solid ammonia-storing material preparation is following with filling method: adopt 58 parts of industrial anhydrous magnesium chlorides, 2 parts of expanded graphites by weight; 15 parts of deionized waters; 10 parts of industrial alcohols and 15 parts of industrial ball clays, the dough mixing machine through machinery stirs and becomes the powder of hygrometric state, incorporation time 5 ~ 15min; Be filled in the autoclave through charging hole; This withstand voltage tank body 5 ~ 10min of method concussion of employing machinery concussion removes air clearance wherein, and the filling of solid ammonia-storing material causes 40% of tank body volume capacity and gets final product; Whole tank body is put into vacuum drying cabinet, begins heating, average 5 ℃/10min from 25 ℃ of room temperatures under the normal pressure; Be warmed up to 70 ℃, open wide charging hole discharge water steam and alcohol steam during heating, 70 ℃ keep 30min; Then at 70 ℃ of following startup vacuum pumps; Progressively vacuumize, divide to make degree of vacuum reach 550mabr three times heat-insulation pressure keeping 30min.

3. according to the solid ammonia-storing material described in the claim 2, it is characterized in that described anhydrous magnesium chloride also can adopt other inorganic salts that can form complex compound to substitute, strontium chloride, nickel chloride, copper chloride or calcium chloride ability and NH3 form the chloride of complex compound.

4. store up the reprocessing control unit that ammonia supplies ammonia according to a kind of single-stage waste heat mode described in the claim 1; It is characterized in that described autoclave is the withstand voltage tank body of stainless steel; The thickness of tank body is 4 ~ 5mm, and is cylindrical, tank interior thermal spraying one deck nylon thermal insulation layer.

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