CN103319375A - Energy saving process and system for ammonia synthesis and urea preparation - Google Patents
Energy saving process and system for ammonia synthesis and urea preparation Download PDFInfo
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- CN103319375A CN103319375A CN201310173686XA CN201310173686A CN103319375A CN 103319375 A CN103319375 A CN 103319375A CN 201310173686X A CN201310173686X A CN 201310173686XA CN 201310173686 A CN201310173686 A CN 201310173686A CN 103319375 A CN103319375 A CN 103319375A
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Abstract
The invention relates to an energy saving process and a system for ammonia synthesis and urea preparation, and solves the problem of high consumption of high pressure energy in the prior art for the ammonia synthesis and urea preparation. Through use of the energy saving process and system, liquid ammonia pressure energy after synthesis ammonia high-pressure separation can be sufficiently utilized, so that the high pressure energy of liquid ammonia before decompression can be sufficiently utilized, and the organic combination between the ammonia synthesis and urea technological process can be realized. The liquid ammonia and liquid ammonia products obtained both by separation have basically same quantity of flow, so that the fluctuation of fluids being pressurized can be avoided, and through regular control of valve groups at both ends of pressure exchanger cylinder bodies, stable and continuous pressurization can be realized. The energy saving process and the system have the advantages of simple process, high utilization rate of the high pressure energy, connectivity operation, low investment cost and operation cost, and high reliability of equipment installation and operation.
Description
Technical field
The present invention relates to the plain technology of a kind of synthetic ammonia antidiuresis and system, a kind of energy-saving technique and system thereof of synthetic ammonia antidiuresis element specifically.
Background technology
In recent years along with the rise significantly of coal, electric power equal energy source price, cause the obvious increase of this high energy-consuming industry production cost of synthetic ammonia urea, the rise of electricity price etc. requires whole nitrogenous fertilizer industry to need further to optimize flow process in design, establish practicable conservation measures, reduce energy consumption, this is significant for the production capacity of optimizing whole nitrogenous fertilizer industry.
Present industrial advanced person's ammonia synthesis technology technology all adopts mesolow ammonia synthesis flow process, and freeze cycle adopts closed circulation loop, and the liquefied ammonia product that ammonia synthesis is produced is delivered to urea plant through after the direct heat exchange; Urea production generally adopts CO
2Air lift technology, the liquefied ammonia product injects condenser through the high-pressure ammonia pump pressurization by high-pressure injector.The working pressure of wherein ammonia synthesis process is generally 12～15MPaG, the working pressure of urea synthesis is also at 13～14MPaG, the consumption that produces high pressure energy accounts for very big proportion in that total system is in service, be one of principal element that influences product cost, thereby it is very necessary therefore to seek rational Technology reduction high pressure energy consumption reduction product cost.
Ammonia synthesis converter comes out almost to have the stress level equal with building-up process through cooled thick ammonia, be 11～14 MPaG, thick ammonia generally will separate output liquefied ammonia product through the high pressure separation with middle pressure, separated 11～14 MPaG by high pressure to middle this process of pressure separation 2～5 MPaG at liquefied ammonia, general direct employing reducing valve, the orifice plate decompression, liquid pressure can be lost in vain, and product liquefied ammonia is delivered to urea synthesis and is needed the liquefied ammonia product is pressurized to 15～18MPaG, increased device consumption so repeatedly, especially the high-pressure ammonia pump under this condition generally also needs import, cost and consumption are all very big, therefore how rationally to utilize the high pressure energy in the thick ammonia, whole synthetic ammonia urea system operation consumes and product cost all has important practical significance for significantly reducing.
Summary of the invention
To the objective of the invention is in order solving the problems of the technologies described above, the energy-saving technique of simple, the high pressure energy utilization ratio of a kind of technology height, connectivity operation, cost of investment and the synthetic ammonia antidiuresis element that running cost is low, equipment installation and operation reliability is high to be provided.
The present invention also provides a kind of energy conserving system of the synthetic ammonia antidiuresis element for above-mentioned technology.
System of the present invention comprises synthetic ammonia loop and urea plant, also includes pressure exchanger, and described pressure exchanger comprises high-pressure side control valve group, upper and lower pressure exchanger cylinder body and low pressure end check valve set; The thick ammonia pipeline in described synthetic ammonia loop is connected with the end of upward pressure interchanger cylinder body with overdraft interchanger cylinder body respectively through High Pressure Ammonia Separator, high-pressure side control valve group; One end of described upward pressure interchanger cylinder body and overdraft interchanger cylinder body also is connected with well heater through high-pressure side control valve group, middle pressure ammonia flash drum, ammonia topping-up pump; Described well heater is connected with the other end of upward pressure interchanger cylinder body with overdraft interchanger cylinder body respectively through the low pressure end check valve set; The other end of described upward pressure interchanger cylinder body and overdraft interchanger cylinder body also is connected with urea plant through low pressure end check valve set, high-pressure ammonia pump.
Described high-pressure side control valve group is made up of four control valves, first control valve is installed on the end and High Pressure Ammonia Separator connecting tube of upward pressure interchanger cylinder body, on the end that second control valve is installed in upward pressure interchanger cylinder body and the pipeline that middle pressure ammonia flash drum is connected, the 3rd control valve is installed on the end and High Pressure Ammonia Separator connecting tube of overdraft interchanger cylinder body, on the end that the 4th control valve is installed in overdraft interchanger cylinder body and the pipeline that middle pressure ammonia flash drum is connected.
Described low pressure end check valve set is made up of four vacuum breaker, first vacuum breaker is installed on the other end and urea plant connecting tube of upward pressure interchanger cylinder body, second vacuum breaker is installed on the connecting tube of the other end of upward pressure interchanger cylinder body and well heater, the 3rd vacuum breaker is installed on the other end and urea plant connecting tube of overdraft interchanger cylinder body, and the 4th vacuum breaker is installed on the connecting tube of the other end of overdraft interchanger cylinder body and well heater.
The two ends of described upward pressure interchanger cylinder body and overdraft interchanger cylinder body are equipped with position switch.
Described position switch is connected with the input terminus of Controlling System, and the output terminal of described Controlling System is connected with the controller of described high-pressure side control valve group.
Described position switch is magnetic coupling switch, the embedding annular permanent magnet corresponding with magnetic coupling switch on the piston in described upward pressure interchanger cylinder body and the overdraft interchanger cylinder body.
Described well heater is the liquefied ammonia well heater in the refrigerating circuit.
The energy-saving technique of synthetic ammonia antidiuresis element of the present invention, adopt the energy conserving system of above-mentioned synthetic ammonia antidiuresis element, when being in first working order, the piston of upward pressure interchanger cylinder body is positioned at an end of cylinder body, the piston of overdraft interchanger cylinder body is positioned at the other end of cylinder body, the thick ammonia that described synthetic ammonia loop produces enters High Pressure Ammonia Separator and isolates high-pressure liquid ammonia, high-pressure liquid ammonia enters an end of upward pressure interchanger cylinder body through high-pressure side control valve group, the piston that promotes in the cylinder body is moved to the other end by an end, make low pressure liquefied ammonia in the upward pressure interchanger cylinder body be pressurized that the back forms that supercharging liquefied ammonia is discharged cylinder body and through the low pressure end check valve set, high-pressure ammonia pump is sent into urea plant, low pressure liquefied ammonia after the heater via heating simultaneously is through the low pressure end check valve set, enter the other end of overdraft interchanger cylinder body, the piston that promotes in the cylinder body is moved to an end by the other end, be discharged from cylinder body after making the interior high-pressure liquid ammonia of overdraft interchanger cylinder body be formed pressure release liquefied ammonia by pressure release, press flash drum in the pressure release liquefied ammonia warp, the ammonia topping-up pump is sent in the well heater and is heated; At this moment, when being in second working order, the piston of upward pressure interchanger cylinder body is positioned at the other end of cylinder body, the piston of overdraft interchanger cylinder body is positioned at an end of cylinder body, described High Pressure Ammonia Separator is isolated high-pressure liquid ammonia enters overdraft interchanger cylinder body through high-pressure side control valve group a end, the piston that promotes in the cylinder body is moved to the other end by an end, low pressure liquefied ammonia in the overdraft interchanger cylinder body is pressurized form that supercharging liquefied ammonia is discharged cylinder body and through the low pressure end check valve set, high-pressure ammonia pump is sent into urea plant, low pressure liquefied ammonia after the heater via heating simultaneously enters the other end of upward pressure interchanger cylinder body through the low pressure end check valve set, the piston that promotes in the cylinder body is moved to an end by the other end, make the high-pressure liquid ammonia in the upward pressure interchanger cylinder body be discharged from cylinder body by pressure release formation pressure release liquefied ammonia, press flash drum in the pressure release liquefied ammonia warp, the ammonia topping-up pump is sent into well heater, and above-mentioned two working ordeies hocket.
During described first working order, first control valve of high-pressure side control valve group and the 4th control valve are opened, and second control valve and the 3rd control valve are closed; During described second working order, second control valve of high-pressure side control valve group and the 3rd control valve are opened, and first control valve and the 4th control valve are closed.
The pressure that described High Pressure Ammonia Separator is isolated high-pressure liquid ammonia is 11～14 MpaG, and the pressure of described low pressure liquefied ammonia is 2～6 MpaG, and the pressure of described pressure release liquefied ammonia is 2～5 MpaG, and the pressure of described supercharging liquefied ammonia is 10～14 MpaG.
The temperature of the low pressure liquefied ammonia after the described heater via heating is 18～22 ℃.
Enter the middle flash drum of pressing by the pressure release liquefied ammonia after the pressure release, the middle flash drum of pressing can further purify purification to pressure release liquefied ammonia, also play shock absorption for pressure release liquefied ammonia, low pressure liquefied ammonia simultaneously, afterwards again by the ammonia topping-up pump, make that the pressure release liquefied ammonia of another cylinder body is discharged in to a pressure exchanger cylinder body supercharging, because the amount of flashed vapour is small, therefore the flow basically identical of upper and lower pressure exchanger cylinder body both sides, thus the complicacy of system's operation reduced.
It is the alternation of merit exchanging container that the switching of utilization control high-pressure side control valve group respective valves and the cooperation of low pressure end check valve set make two pressure exchanger cylinder bodies, make the liquefied ammonia product can be by continuously supercharging, pressure release, make liquefied ammonia be guaranteed the continuity of technology by continuous blow-down.
Pressure release liquefied ammonia carries out heat exchange by liquefied ammonia in the liquefied ammonia well heater in the refrigerating circuit and the refrigerating circuit, makes pressure release liquefied ammonia be warming up to 18～22 ℃, can solve the intensification requirement of pressure release liquefied ammonia in this technology, can solve the cooling requirement of liquefied ammonia in the refrigerating circuit again.
Magnetic coupling switch is set as position switch at the two ends of upper and lower pressure exchanger cylinder body, to detect the position of piston in cylinder body, and with the signal input control system of detection position, the output control signal that compares to determine by Controlling System is given high-pressure side control valve group, control the switching of each valve, successfully realize the accurate control in each step.Guaranteeing have a pressure exchanger cylinder body to be under the high pressure conditions prerequisite all the time, the time that the time that pressure leak process needs and pressurization need is more approaching, the flow of the feasible liquefied ammonia product that is pressurized is supplied with more continuous, and need not worry that needs guarantee the problem that the opening and closing of valve need be carried out synchronously.
Technology of the present invention can take full advantage of the pressure energy that the synthetic ammonia high pressure separates back liquefied ammonia, the high pressure of the preceding liquefied ammonia of decompression can be fully used, make ammonia synthesis and urea technique flow process realize combination, it is basic identical to separate the liquefied ammonia and the liquefied ammonia product flow that produce, avoided being pressurized the fluctuation of fluid, by the regular regulation and control of pressure exchanger cylinder body two ends valving, realized the continous-stable supercharging, apparatus of the present invention are the also input of no longer additional other outside energy in operational process, urea is reduced to the greatest extent to the full extent with the load of high-pressure ammonia pump, avoid the expensive of import equipment, pressure reduction reduces and has also reduced pump operating high power consumption continuously simultaneously.In the present invention design, taken into full account the security of operation, utilized the piston in the pressure exchanger cylinder body to separate the two ends fluid, the influence of having avoided minor component in the thick ammonia to produce urea synthesis.
This operation pressure can exchange efficiency can reach 90～95%, make the total system operation energy consumption still less, more economical.With the synthetic ammonia urea plant of one " 5080 " scale, the scheme after the optimization reduces near 600kW than former scheme energy consumption, and the annual running cost that can save about 3,000,000 Renminbi of only this item this shows that the energy-saving effect after the present invention uses is obvious.System of the present invention can easily dock with synthetic ammonia loop, refrigerating circuit and apparatus for urea synthesis, satisfies the processing requirement of each loop and device liquefied ammonia, and total system is simple in structure, easy and simple to handle, energy-saving and cost-reducing, good reliability.
Description of drawings
Fig. 1 is process flow sheet of the present invention and system construction drawing.
Fig. 2 uses synoptic diagram for the control of first working order of pressure exchanger of the present invention.
Fig. 3 uses synoptic diagram for the control of second working order of pressure exchanger of the present invention.
Fig. 4 is the sectional view of separator piston.
Fig. 5 is control principle figure.
Wherein, 1-High Pressure Ammonia Separator, 2-middle pressure ammonia flash drum, 3-upward pressure interchanger cylinder body, 4-overdraft interchanger cylinder body, 5-ammonia topping-up pump, 6-refrigerating circuit, 6.1-liquefied ammonia well heater, 7-high-pressure ammonia pump, 8-high-pressure side control valve group, XV01-first control valve, XV02-second control valve, XV03-the 3rd control valve, XV04-the 4th control valve, 9-low pressure end check valve set, CV01-first vacuum breaker, CV02-second vacuum breaker, CV03-the 3rd vacuum breaker, CV04-the 4th vacuum breaker, 10-separator piston, ZS01-first location switch, ZS02-second position switch, the ZS03-three position switch, ZS04-the 4th position switch, 11-synthetic ammonia loop, the 12-urea plant, the 13-annular permanent magnet.
Embodiment
Below in conjunction with accompanying drawing system of the present invention and technological process are further explained explanation:
System of the present invention comprises synthetic ammonia loop 11 and urea plant 12, also includes pressure exchanger, and described pressure exchanger comprises high-pressure side control valve group 8, upper and lower pressure exchanger cylinder body 3,4 and low pressure end check valve set 9; The thick ammonia pipeline in described synthetic ammonia loop 11 is connected with the end of upward pressure interchanger cylinder body 3 with overdraft interchanger cylinder body 4 respectively through High Pressure Ammonia Separator 1, high-pressure side control valve group 8; One end of described upward pressure interchanger cylinder body 3 and overdraft interchanger cylinder body 4 also is connected with liquefied ammonia well heater 6.1 in the refrigerating circuit 6 through high-pressure side control valve group 8, middle pressure ammonia flash drum 2, ammonia topping-up pump 5; Liquefied ammonia well heater 6.1 in the described refrigerating circuit 6 is connected with the other end of upward pressure interchanger cylinder body 3 with overdraft interchanger cylinder body 4 respectively through low pressure end check valve set 9; The other end of described upward pressure interchanger cylinder body 3 and overdraft interchanger cylinder body 4 also is connected with urea plant 12 through low pressure end check valve set 9, high-pressure ammonia pump 7.
With reference to Fig. 2, described high-pressure side control valve group 8 is made up of four control valves, the first control valve XV01 is installed on the end and High Pressure Ammonia Separator 1 connecting tube of upward pressure interchanger cylinder body 3, on the end that the second control valve XV02 is installed in upward pressure interchanger cylinder body 3 and the pipeline that middle pressure ammonia flash drum 2 is connected, the 3rd control valve XV03 is installed on the end and High Pressure Ammonia Separator 1 connecting tube of overdraft interchanger cylinder body 4, on the end that the 4th control valve XV04 is installed in overdraft interchanger cylinder body 4 and the pipeline that middle pressure ammonia flash drum 2 is connected.
With reference to Fig. 2, described low pressure end check valve set 9 is made up of four vacuum breaker, the first vacuum breaker CV01 is installed on the other end and urea plant 12 connecting tubes of upward pressure interchanger cylinder body 3, can realize that liquid in the upward pressure interchanger cylinder body 3 is to the uniflux of urea plant 12 directions; The second vacuum breaker CV02 is installed on the connecting tube of the other end of upward pressure interchanger cylinder body 3 and liquefied ammonia well heater 6.1, can realize the uniflux of liquid upward pressure interchanger cylinder body 3 directions in the liquefied ammonia well heater 6.1; The 3rd vacuum breaker CV03 is installed on the connecting tube of the other end of overdraft interchanger cylinder body 4 and urea plant 12, can realize that liquid in the overdraft interchanger cylinder body 4 is to the uniflux of urea plant 12 directions; The 4th vacuum breaker CV04 is installed on the connecting tube of the other end of overdraft interchanger cylinder body 4 and liquefied ammonia well heater 6.1, can realize the uniflux of liquid downward pressure interchanger cylinder body 4 directions in the liquefied ammonia well heater 6.1.
One end of described upward pressure interchanger cylinder body 3 is established second position switch ZS02, the other end is established first location switch ZS01, one end of overdraft interchanger cylinder body 4 is established the 4th position switch ZS04, the other end is established three position switch ZS03, described position switch is magnetic coupling switch, with reference to Fig. 4, the embedding annular permanent magnet 13 corresponding with magnetic coupling switch on 4 the separator piston 10 in described upward pressure interchanger cylinder body 3 and the overdraft interchanger cylinder body, when separator piston 10 during near a certain position switch, then annular permanent magnet 13 can be detected by corresponding position switch.With reference to Fig. 5, all described position switch all are connected with the input terminus of Controlling System, and the output terminal of described Controlling System is connected with the controller of described high-pressure side control valve group.The preferred DCS Controlling System of described Controlling System.Four control valves in the described high-pressure side control valve group 8 preferably adopt pneumatic track ball valve, and described low pressure end check valve set 9 is preferably adopted the folder swing check valve by four vacuum breaker.
Technological process:
With reference to Fig. 2, when being in first working order, the separator piston 10 of upward pressure interchanger cylinder body 3 is positioned at an end of cylinder body, the separator piston 10 of overdraft interchanger cylinder body 4 is positioned at the other end of cylinder body, thereby detected by second position switch ZS02 and three position switch ZS03, this position signal is transferred into Controlling System, and first control valve and the 4th control valve of Controlling System control high-pressure side control valve group are opened, and second control valve and the 3rd control valve are closed; The thick ammonia E(pressure that described synthetic ammonia loop 11 produces is 11～14MPaG, temperature is for-5～0 ℃) entering High Pressure Ammonia Separator 1, to isolate high-pressure liquid ammonia A(pressure be 11～14MPaG, temperature is-5～0 ℃, isolated circulation gas F is recycled to synthetic ammonia loop 11), high-pressure liquid ammonia A enters an end of upward pressure interchanger cylinder body 3 through the first control valve XV01 of high-pressure side control valve group, the separator piston 10 that promotes in the cylinder body is moved to the other end by an end, and making upward pressure interchanger cylinder body 3 interior low pressure liquefied ammonia C be pressurized back formation supercharging liquefied ammonia D(pressure is 10～14MPaG.Temperature is 18～22 ℃) discharge cylinder body and through the first vacuum breaker CV01 of low pressure end check valve set, high-pressure ammonia pump 7 is sent into urea plant 12 after being pressurized to 15～18MpaG, simultaneously (temperature is 18～22 ℃ to the low pressure liquefied ammonia after the liquefied ammonia well heater 6.1 of refrigerating circuit 6 and liquefied ammonia in the refrigerating circuit 6 carry out heat exchange, pressure is 2～6 MpaG) enter the other end of overdraft interchanger cylinder body 4 through the 4th vacuum breaker CV04 of low pressure end check valve set 9, the separator piston 10 that promotes in the cylinder body is moved to an end by the other end, making the high-pressure liquid ammonia A discharge cylinder body formation pressure release liquefied ammonia B(pressure of pressure release in the overdraft interchanger cylinder body 4 is 2～5 MpaG, temperature is-5～0 ℃) also press flash drum 2(under the pressure of 2～5MpaG, to carry out flash distillation in the warp, micro-flashed vapour G is recycled to synthetic ammonia loop 11) flash distillation, product liquefied ammonia is pressurized to 2.5～6MpaG through the ammonia topping-up pump and sends into and be heated to 18-22 ℃ in the well heater; With reference to Fig. 3, at this moment, be in second working order, the separator piston 10 of upward pressure interchanger cylinder body 3 is positioned at the other end of cylinder body, the separator piston 10 of overdraft interchanger cylinder body 4 is positioned at an end of cylinder body, thereby is detected by first location switch ZS01 and the 4th position switch ZS04, and this position signal is transferred into Controlling System, the second control valve XV02 and the 3rd control valve XV03 of Controlling System control high-pressure side control valve group 9 open, and the first control valve XV01 and the 4th control valve XV04 close; Described High Pressure Ammonia Separator 1 is isolated high-pressure liquid ammonia A enters overdraft interchanger 4 cylinder bodies through 9 groups of high-pressure side control valves a end, the separator piston 10 that promotes in the cylinder body is moved to the other end by an end, low pressure liquefied ammonia C in overdraft interchanger 4 cylinder bodies is pressurized form supercharging liquefied ammonia D to discharge cylinder body and through the 3rd vacuum breaker CV03 of low pressure end check valve set, high-pressure ammonia pump 7 is sent into urea plant 12 after being pressurized to 15～18MpaG, low pressure liquefied ammonia C after 6.1 heating of liquefied ammonia well heater enters the other end of upward pressure interchanger cylinder body 3 through the second vacuum breaker CV02 of low pressure end check valve set 9 simultaneously, the interior separator piston 10 of promotion cylinder body is moved to an end by the other end, makes the high-pressure liquid ammonia A of the pressure release in the upward pressure interchanger cylinder body 3 be discharged from behind the cylinder body formation pressure release liquefied ammonia B and pressure flash drum 2 in the warp, the liquefied ammonia well heater 6.1 that ammonia topping-up pump 5 is sent into refrigerating circuit 6 carries out the heat exchange intensification with the liquefied ammonia that freezes in the loop 6.At this moment, first working order is got back in separator piston position in the upper and lower pressure exchanger cylinder body 3,4, two working ordeies of Controlling System control hocket, supercharging and pressure leak process in two pressure exchanger cylinder bodies hocket, another cylinder body of cylinder body supercharging while carries out pressure release, twin-tub is in opposite working order all the time, with guarantee liquefied ammonia product feed rate continuously, make the carrying out of whole process continous-stable.
Claims (11)
1. the energy conserving system of a synthetic ammonia antidiuresis element comprises synthetic ammonia loop and urea plant, it is characterized in that, also includes pressure exchanger, and described pressure exchanger comprises high-pressure side control valve group, upper and lower pressure exchanger cylinder body and low pressure end check valve set; The thick ammonia pipeline in described synthetic ammonia loop is connected with the end of upward pressure interchanger cylinder body with overdraft interchanger cylinder body respectively through High Pressure Ammonia Separator, high-pressure side control valve group; One end of described upward pressure interchanger cylinder body and overdraft interchanger cylinder body also is connected with well heater through high-pressure side control valve group, middle pressure ammonia flash drum, ammonia topping-up pump; Described well heater is connected with the other end of upward pressure interchanger cylinder body with overdraft interchanger cylinder body respectively through the low pressure end check valve set; The other end of described upward pressure interchanger cylinder body and overdraft interchanger cylinder body also is connected with urea plant through low pressure end check valve set, high-pressure ammonia pump.
2. the energy conserving system of synthetic ammonia antidiuresis element as claimed in claim 1, it is characterized in that, described high-pressure side control valve group is made up of four control valves, first control valve is installed on the end and High Pressure Ammonia Separator connecting tube of upward pressure interchanger cylinder body, on the end that second control valve is installed in upward pressure interchanger cylinder body and the pipeline that middle pressure ammonia flash drum is connected, the 3rd control valve is installed on the end and High Pressure Ammonia Separator connecting tube of overdraft interchanger cylinder body, on the end that the 4th control valve is installed in overdraft interchanger cylinder body and the pipeline that middle pressure ammonia flash drum is connected.
3. the energy conserving system of synthetic ammonia antidiuresis element as claimed in claim 1, it is characterized in that, described low pressure end check valve set is made up of four vacuum breaker, first vacuum breaker is installed on the other end and urea plant connecting tube of upward pressure interchanger cylinder body, second vacuum breaker is installed on the connecting tube of the other end of upward pressure interchanger cylinder body and well heater, the 3rd vacuum breaker is installed on the other end and urea plant connecting tube of overdraft interchanger cylinder body, and the 4th vacuum breaker is installed on the connecting tube of the other end of overdraft interchanger cylinder body and well heater.
4. as the energy conserving system of each described synthetic ammonia antidiuresis element of claim 1-3, it is characterized in that the two ends of described upward pressure interchanger cylinder body and overdraft interchanger cylinder body are equipped with position switch.
5. the energy conserving system of synthetic ammonia antidiuresis element as claimed in claim 4 is characterized in that, described position switch is connected with the input terminus of Controlling System, and the output terminal of described Controlling System is connected with the controller of described high-pressure side control valve group.
6. the energy conserving system of synthetic ammonia antidiuresis element as claimed in claim 4 is characterized in that, described position switch is magnetic coupling switch, the embedding annular permanent magnet corresponding with magnetic coupling switch on the piston in described upward pressure interchanger cylinder body and the overdraft interchanger cylinder body.
7. as the energy conserving system of the described synthetic ammonia antidiuresis of claim 1-3 element, it is characterized in that described well heater is the liquefied ammonia well heater in the refrigerating circuit.
8. the energy-saving technique of a synthetic ammonia antidiuresis element, it is characterized in that, adopt the energy conserving system of each described synthetic ammonia antidiuresis element of claim 1-7, when being in first working order, the piston of upward pressure interchanger cylinder body is positioned at an end of cylinder body, the piston of overdraft interchanger cylinder body is positioned at the other end of cylinder body, the thick ammonia that described synthetic ammonia loop produces enters High Pressure Ammonia Separator and isolates high-pressure liquid ammonia, high-pressure liquid ammonia enters an end of upward pressure interchanger cylinder body through high-pressure side control valve group, the piston that promotes in the cylinder body is moved to the other end by an end, make low pressure liquefied ammonia in the upward pressure interchanger cylinder body be pressurized that the back forms that supercharging liquefied ammonia is discharged cylinder body and through the low pressure end check valve set, high-pressure ammonia pump is sent into urea plant, low pressure liquefied ammonia after the heater via heating simultaneously is through the low pressure end check valve set, enter the other end of overdraft interchanger cylinder body, the piston that promotes in the cylinder body is moved to an end by the other end, be discharged from cylinder body after making the interior high-pressure liquid ammonia of overdraft interchanger cylinder body be formed pressure release liquefied ammonia by pressure release, press flash drum in the pressure release liquefied ammonia warp, the ammonia topping-up pump is sent in the well heater and is heated; At this moment, when being in second working order, the piston of upward pressure interchanger cylinder body is positioned at the other end of cylinder body, the piston of overdraft interchanger cylinder body is positioned at an end of cylinder body, described High Pressure Ammonia Separator is isolated high-pressure liquid ammonia enters overdraft interchanger cylinder body through high-pressure side control valve group a end, the piston that promotes in the cylinder body is moved to the other end by an end, low pressure liquefied ammonia in the overdraft interchanger cylinder body is pressurized form that supercharging liquefied ammonia is discharged cylinder body and through the low pressure end check valve set, high-pressure ammonia pump is sent into urea plant, low pressure liquefied ammonia after the heater via heating simultaneously enters the other end of upward pressure interchanger cylinder body through the low pressure end check valve set, the piston that promotes in the cylinder body is moved to an end by the other end, make the high-pressure liquid ammonia in the upward pressure interchanger cylinder body be discharged from cylinder body by pressure release formation pressure release liquefied ammonia, press flash drum in the pressure release liquefied ammonia warp, the ammonia topping-up pump is sent into well heater, and above-mentioned two working ordeies hocket.
9. the energy-saving technique of synthetic ammonia antidiuresis element as claimed in claim 8 is characterized in that, during described first working order, first control valve of high-pressure side control valve group and the 4th control valve are opened, and second control valve and the 3rd control valve are closed; During described second working order, second control valve of high-pressure side control valve group and the 3rd control valve are opened, and first control valve and the 4th control valve are closed.
10. the energy-saving technique of synthetic ammonia antidiuresis element as claimed in claim 8 or 9, it is characterized in that, the pressure that described High Pressure Ammonia Separator is isolated high-pressure liquid ammonia is 11～14 MpaG, the pressure of described low pressure liquefied ammonia is 2～6 MpaG, the pressure of described pressure release liquefied ammonia is 2～5 MpaG, and the pressure of described supercharging liquefied ammonia is 10～14 MpaG.
11. the energy conserving system of synthetic ammonia antidiuresis element is characterized in that as claimed in claim 8 or 9, the temperature of the low pressure liquefied ammonia after the described heater via heating is 18～22 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113282121A (en) * | 2021-05-27 | 2021-08-20 | 东莞德盛肥料科技有限公司 | Intelligent chemical fertilizer production control system |
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| CN103319375B (en) | 2015-04-01 |
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