CN104748507B - Treatment system for recovering chemical plant waste gas containing ammonia into liquid ammonia and treatment method thereof - Google Patents
Treatment system for recovering chemical plant waste gas containing ammonia into liquid ammonia and treatment method thereof Download PDFInfo
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- CN104748507B CN104748507B CN201510094398.4A CN201510094398A CN104748507B CN 104748507 B CN104748507 B CN 104748507B CN 201510094398 A CN201510094398 A CN 201510094398A CN 104748507 B CN104748507 B CN 104748507B
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Abstract
The invention discloses a treatment system for recovering chemical plant waste gas containing ammonia into liquid ammonia and a treatment method thereof. The treatment method comprises the steps of primary surface cold treatment, frequency conversion pressure stabilizing treatment, primary condensing treatment, secondary condensing treatment, drying filtration treatment, cooling liquidation treatment, gas-liquid separation treatment and the like. The treatment system comprises a primary surface air cooler, a frequency conversion Roots blower, a primary condenser, a secondary condenser, a primary drying filter, a secondary drying filter, a liquid ammonia plate heat exchanger and a gas-liquid separator which are communicated through a pipeline, and finally a high-purity liquid ammonia product is obtained. Meanwhile, the treatment method further comprises the step of tail gas treatment. The treatment system further comprises a tail gas treatment unit, and high-concentration liquid ammonia is prepared and obtained. The treatment method has the advantages that the treatment effect is good, the purity of side products is high, the market value of the side products is high, and the side products are environmentally friendly. The treatment system has the advantages of being convenient to operate, low in energy consumption cost, high in intelligence degree, good in safety, high in stability and small in space size.
Description
Technical field
The present invention relates to waste gas recovery processing technology field, specifically refers to a kind of chemical plant ammonia-contaminated gas and is recovered as liquefied ammonia
Processing system and its processing method.
Background technology
Chemical industry occupies critical role in the national economy of various countries, is that basic industry and the pillar of many countries is produced
Industry.The development speed of chemical industry and scale are directly affected to each department of social economy, and world's chemical products are produced per year
Value is more than 1,500,000,000,000 dollars.As chemical industry is of a great variety, complex process, product it is various, the pollutant discharged in production
Species is more, quantity is big, toxicity is high, therefore, chemical industry is heavy polluter.Meanwhile, chemical products processing, storage, use and
The links such as offal treatment are likely to produce a large amount of noxious substances and influence ecological environment, jeopardize human health.Chemistry
Industrial development walks sustainable development path for human economy, social development have important practical significance.
This technology is the chemical enterprise for there is a large amount of ammonia-containing exhaust discharges.Conventional processing technique has 1, is given up with sulfuric acid absorption
Ammonia in gas forms ammonium sulphate, but ammonium sulfate need to be processed again, and processing cost is very high.2nd, wash method with water and absorb tail gas
In ammonia, then with NAOH neutralizing to reach the purpose of ammonia nitrogen qualified discharge, but treatment effect is unstable.Conventional technology is not
But the effect on driving birds is not good for processing and the value not reused.This technology both can thoroughly solve pollution problem, and can reach
The effect for turning waste into wealth.
The content of the invention
It is an object of the invention to provide a kind of chemical plant ammonia-contaminated gas are recovered as the processing system and its processing method of liquefied ammonia,
Described processing method has the characteristics of high high treating effect, side-product purity, high side-product market value and environmental protection, institute
The processing system stated has the characteristics of simple operation, energy consumption cost are low, intelligence degree is high, safety good and spatial volume is little.
The present invention can be achieved through the following technical solutions：
The invention discloses a kind of chemical plant ammonia-contaminated gas are recovered as the processing system and its processing method of liquefied ammonia, describedization
Factory's ammonia-contaminated gas are recovered as the processing method of liquefied ammonia and comprise the following steps：
The first step, primary table cold treatment：The useless ammonia of high temperature that workshop reactor is discharged is received, is carried out into primary surface cooler
Primary water-cooled cooling, obtain primary table it is cold after useless ammonia, the chilling temperature of the primary surface cooler is 30～60 DEG C.By first
Level table cold treatment, the useless ammonia of up to 200 DEG C of the temperature discharged from workshop reactor pipeline are tentatively cooled to 30～60 DEG C.
Second step, frequency conversion voltage stabilizing are processed：The ammonia-contaminated gas after the first frequency conversion roots blower receives primary table cold treatment,
The connecting pipe of workshop reactor and primary surface cooler arranges B/P EGR Back Pressure Transducer EGR, by the analog quantity transfer function of B/P EGR Back Pressure Transducer EGR
Feedback control has the primary roots blower of frequency conversion function, realizes the frequency adjustment of the first frequency conversion roots blower, so that passing through
After primary table cold treatment, ammonia-contaminated gas keep the steady statue of negative pressure, and stablizing for processing procedure ammonia-contaminated gas pressure has been effectively ensured
Property.
3rd step, one-level condensation process：Useless ammonia obtained by second step after frequency conversion voltage stabilizing process is become by first
Frequency roots blower is once pressurizeed and is then sent to first-stage condenser and carries out one-level condensation, obtains the condensed useless ammonia of one-level
Gas, the condensation temperature of the one-level condensation is 15～20 DEG C.By one-level condensation process, temperature is 30～60 DEG C of useless ammonia quilt
15～20 DEG C are condensed into further.
4th step, B-grade condensation process：Receive the condensed useless ammonia of one-level obtained by the 3rd step and be delivered to secondary condenser
B-grade condensation is carried out, the useless ammonia after B-grade condensation is obtained, the condensation temperature of the B-grade condensation is 0～5 DEG C.It is cold by two grades
Solidifying to process, temperature is that 15～20 DEG C of non-ammonia is further condensed into 0～5 DEG C.
5th step, dry filter process：Second frequency conversion Roots's wind is passed through to the useless ammonia after B-grade condensation obtained by the 4th step
Machine carries out secondary pressurized and then while is delivered to one-level device for drying and filtering and secondary drying filter is dried and filters at purification
Reason, obtains dried useless ammonia.By dry filter process, moisture and other impurities effectively in the useless ammonia of removal, to the ammonia that gives up
The purity of gas is purified.
6th step, cooling liquefaction are processed：Dried useless ammonia obtained by 5th step is delivered to liquefied ammonia plate type heat exchanger to enter
Row cooling liquefaction, obtains the liquefied ammonia crude product after liquefying of lowering the temperature, and the temperature of the cooling liquefaction is -15～-40 DEG C.By cooling
Liquefaction is processed, and the ammonia after the 4th step is purified is converted into liquefied ammonia crude product, and primary liquefaction is completed.
7th step, gas-liquid separation are processed：Liquefied ammonia crude product conveying obtained by 6th is carried out into gas-liquid as gas-liquid separator
Isolated highly purified liquefied ammonia and liquid ammonia pollution, the highly purified liquefied ammonia of gained are delivered to liquefied ammonia holding vessel and are preserved, institute
The liquid ammonia pollution for obtaining carries out exhaust aftertreatment by the pressurization extraction of tail gas frequency conversion roots blower.Processed by gas-liquid separation, obtained
Highly purified liquefied ammonia product, the final liquefied ammonia high purity more than 99.9%, with good market value.In order to avoid
The liquid ammonia pollution of gas-liquid separation directly discharges the impact caused to environment, and the liquid ammonia pollution of gained passes through tail gas frequency conversion roots blower
Pressurization is extracted out and carries out follow-up vent gas treatment, further improves the market value of useless ammonia,
Further, the 7th step needs the liquid ammonia pollution for carrying out exhaust aftertreatment to deliver in absorption tower after pressurizeing, and leads to
Crossing pure water device for supplying carries out pure water supply, carries out absorption cycle process of lowering the temperature by ammonia heat exchanger and water circulating pump, finally
Obtain ammonia that concentration is more than 20% and can qualified discharge tail gas, the concentration is that more than 20% ammonia is delivered to ammonia
Holding vessel is preserved, it is described can the tail gas of qualified discharge directly directly discharged by absorption tower.By exhaust aftertreatment,
Liquid ammonia pollution after gas-liquid separation is finally absorbed by pure water cooling, forms the strong aqua ammonia of high concentration, and the concentration of the strong aqua ammonia is high
Up to more than 20%, can directly using as fertilizer application.Meanwhile, the tail gas after vent gas treatment reaches the row of national regulation
Standard is put, directly can discharge can't generation environment pollution.
Further, primary table cold treatment described in the first step is multistage substep table cold treatment, the primary table described in the first step
Cooler is provided with the cooling zone of two or more different temperatures.By multistage substep table cold treatment, the cooling zone of different temperatures is set, is kept away
Exempt from the excessive energy loss for causing of temperature difference, improve capacity usage ratio, reducing energy consumption.
Further, the B-grade condensation process described in the one-level condensation process and the 4th step described in the 3rd step is multistage cold
It is solidifying to process, two or more not equality of temperature is equipped with inside the secondary condenser described in first-stage condenser and the 4th step described in the 3rd step
The condensing zone of degree.Processed by multistage fractional condensation, the cooling zone of different temperatures is set, it is to avoid the excessive energy for causing of temperature difference
Loss, improves capacity usage ratio, reducing energy consumption.
Further, the liquefied ammonia holding vessel described in the 7th step is provided with concentration on-line computing model in highly purified liquefied ammonia porch
Table, directly delivers into liquefied ammonia holding vessel after liquefied ammonia concentration is up to standard, concentration is not up to standard to come back for secondary cycle separation.By setting
Concentration online monitoring instrument is put, the concentration of liquefied ammonia can be monitored, it is ensured that the purity of liquefied ammonia meets more than 99.9% requirement, can be with
Directly user is sent to by liquefied ammonia delivery pump directly to be used, fully ensure that the market value of liquefied ammonia.
Corresponding with the processing system that the chemical plant ammonia-contaminated gas are recovered as liquefied ammonia, the chemical plant ammonia-contaminated gas are recovered as
The processing system of liquefied ammonia, is connected with the useless ammonia discharge line of workshop reactor, and the processing system includes that chilling temperature is 30
～60 DEG C of primary surface cooler, the first-stage condenser that condensation temperature is 15～20 DEG C, the B-grade condensation that condensation temperature is 0～5 DEG C
Device, one-level device for drying and filtering, secondary drying filter, liquefied ammonia plate type heat exchanger, gas-liquid separator and liquefied ammonia holding vessel, it is described first
The inlet end of level surface cooler is connected with useless ammonia discharge line, the outlet of the inlet end of the first-stage condenser and primary surface cooler
End pipeline communication, the inlet end of the secondary condenser and the outlet side pipeline communication of first-stage condenser, the secondary condenser
Outlet side simultaneously with one-level device for drying and filtering, the inlet end pipeline communication of secondary drying filter, the one-level dry filter
The outlet side inlet end pipeline communication simultaneously with liquefied ammonia plate type heat exchanger of device, secondary drying filter, the gas-liquid separator
Inlet end and liquefied ammonia plate type heat exchanger outlet side pipeline communication, the outfan of the gas-liquid separator passes through liquefied ammonia delivery pump
First frequency conversion Roots's wind is provided with the connecting pipe of liquefied ammonia holding vessel pipeline communication, the primary surface cooler and first-stage condenser
The connecting pipe of machine, the secondary condenser and one-level device for drying and filtering is provided with the second frequency conversion roots blower, the gas-liquid separation
The pipeline at output of device is provided with tail gas frequency conversion roots blower.Whole system carries out material transferring by pipeline, without the need for manually carrying out
Intervene, reduce the convenience of operation and the safety of raising operation.By arrange that multi-level table is cold in systems and multi-stage condensing at
Reason, effectively improves capacity usage ratio, reduces the manufacturing cost of product；By arranging the first frequency conversion roots blower, second frequency conversion sieve
Thatch blower fan and tail gas frequency conversion roots blower, carry out pressurized treatments, the ammonia after the completion of acceleration process to the course of conveying of the ammonia that gives up
Transmission in pipeline, had both reduced the pressure-bearing risk of explosion in pipeline, accelerated the handling process of useless ammonia again.
Further, the processing system also includes exhaust aftertreatment unit, and the exhaust aftertreatment unit includes absorbing
Tower, ammonia plate type heat exchanger and tank used for storing ammonia, the outlet side of the inlet end on the absorption tower and the tail gas frequency conversion roots blower
Pipeline communication, the inside on the absorption tower are provided with ammonia circulation pump, are provided with pure water device for supplying, institute at the top of the ammonia circulation pump
The outfan for stating absorption tower is connected with ammonia plate type heat exchanger, the ammonia plate type heat exchanger simultaneously with absorption tower at the top of and ammonia
By the T-shaped connection of pipeline, the T-shaped connectivity part of the pipeline is provided with the ammonia concn for carrying out ammonia concn exhausting control control to storage tank
Meter.By absorption process being carried out in exhaust aftertreatment unit to tail gas, finally give the ammonia of high concentration and directly can discharge
Tail gas；By arranging ammonia concn meter, ammonia can be effectively ensured and enters ammonia holding vessel after concentration requirement is met just now
Preserved.
Further, autoclave is provided with B/P EGR Back Pressure Transducer EGR, first frequency conversion with the connecting pipe of primary surface cooler
The connection of the connecting pipe of roots blower and the primary surface cooler, the primary surface cooler and the first frequency conversion roots blower
Pipeline, the first frequency conversion roots blower and the connecting pipe of the secondary condenser, the secondary drying filter and gas-liquid
The connecting pipe of separator is equipped with temperature sensor and positive pressure sensor, the B/P EGR Back Pressure Transducer EGR and the first frequency conversion Roots
Blower fan is electrically connected.By arranging numerous electronic monitoring instrument at different pipelines, the whole process of processing system is carried out effectively
Monitoring, it is ensured that the stability of processing system operation.Meanwhile, the setting of numerous electronic monitoring instrument possesses the base of Based Intelligent Control
Plinth, whole processing system possess the basis of remote monitoring process.Meanwhile, B/P EGR Back Pressure Transducer EGR is electrically connected with the first frequency conversion roots blower
Situation that is logical, being discharged from workshop reactor with the useless ammonia of real-time monitoring, in the case where output is excessive, pressurization is increased in time
Air quantity, reduces security risk.
Further, the primary surface cooler, first-stage condenser and secondary condenser are equipped with thermometer, and the thermometer sets
Put in the exit of primary surface cooler, first-stage condenser and secondary condenser coolant.By arranging numerous thermometeies, Ke Yishi
When effective detection table it is cold and condensation effect, it is ensured that the process of process.
Further, the first frequency conversion roots blower, the second frequency conversion roots blower and tail gas frequency conversion roots blower are
Explosion-proof type roots blower with frequency conversion function.Using explosion-proof type blower fan, the security risk of pipeline pressure-bearing is effectively ensured；Described
Roots blower is frequency conversion fan, effectively reduces the open frequency of blower fan, reducing energy consumption, the service life of extension device.
A kind of chemical plant ammonia-contaminated gas of the present invention are recovered as the processing method of liquefied ammonia, with following beneficial effect：
Firstth, high treating effect, is processed to useless ammonia by Multi-stage cooling, filtration and gas-liquid separation, is given up in ammonia
Ammonia composition fully liquefy and become liquefied ammonia or ammonia is changed into by absorbing pure water, efficiently accomplished the process to the ammonia that gives up；
Secondth, side-product purity is high, and in the side-product for finally giving, the purity of liquefied ammonia is 99.9% liquefied ammonia, the concentration of ammonia
For more than 20%；
3rd, side-product market value is high, and, using useless ammonia as raw material, raw material sources are extensive for the processing method for being adopted,
In addition the side-product purity of gained is excellent, with low cost, with the higher market competitiveness；
4th, environmental protection, by the ammonia remained in absorption tower cyclic absorption technology again processing system, to reach tail
The complete qualified discharge of gas, does not result in atmospheric pollution.
A kind of chemical plant ammonia-contaminated gas of the present invention are recovered as the processing system and its processing method of liquefied ammonia, have with following
Beneficial effect：
Firstth, simple operation, internal system material directly carry out automated material transmission by pipeline, without the need for manually carrying out
Intervene, it is simple to operate；
Secondth, energy consumption cost is low, carries out system setting, system using Multi-stage cooling, filtration and gas-liquid separation to useless ammonia
Heat recoverable, improves capacity usage ratio and reduces energy consumption cost；
3rd, intelligence degree is high, arranges numerous electronic monitoring instrument for monitoring control for some analog quantitys in system,
Control point can be monitored by analog quantity and realize remote monitoring and administration；
4th, safety is good, and whole system directly carries out material transferring by pipeline, without the need for manually being intervened, processes
System run all right.Early warning and monitoring instrument perfects, and effectively excludes potential safety hazard, reduces the generation of the security incidents such as leakage；
5th, stability is high, is provided with B/P EGR Back Pressure Transducer EGR between workshop reactor and primary surface cooler, B/P EGR Back Pressure Transducer EGR with
The connection of first frequency conversion roots blower realizes that analog quantity is transmitted, and carries out frequency conversion holding negative pressure voltage stabilizing shape to the ammonia-contaminated gas of negative pressure state
State, has been effectively ensured the stability of system；
5th, spatial volume is little, and in system, each device is connected by pipeline, and each setting position arranges flexible, effectively presses
Spatial volume occupied by compression system.
Description of the drawings
Accompanying drawing 1 is the processing system composition schematic diagram that a kind of chemical plant ammonia-contaminated gas of the invention are recovered as liquefied ammonia；
Labelling in accompanying drawing includes：1st, reactor, 2, B/P EGR Back Pressure Transducer EGR, 3, primary surface cooler, 4, temperature sensor, 5, the
One frequency conversion roots blower, 6, positive pressure sensor, 7, first-stage condenser, 8, secondary condenser, the 9, second frequency conversion roots blower, 10,
One-level device for drying and filtering, 11, secondary drying filter, 12, liquefied ammonia plate type heat exchanger, 13, gas-liquid separator, 14, liquefied ammonia storage
Tank, 15, liquefied ammonia delivery pump, 16, tail gas frequency conversion roots blower, 17, absorption tower, 18, ammonia circulation pump, 19, ammonia concn meter,
20th, ammonia plate type heat exchanger, 21, ammonia holding vessel, 22, ammonium hydroxide delivery pump, 23, thermometer.
Specific embodiment
In order that those skilled in the art more fully understand technical scheme, with reference to embodiment and accompanying drawing
Product of the present invention is described in further detail.
The invention discloses the invention discloses a kind of chemical plant ammonia-contaminated gas are recovered as processing system and its place of liquefied ammonia
Reason method, the processing system and processing method are in correspondence with each other.
As shown in figure 1, chemical plant ammonia-contaminated gas are recovered as the processing system of liquefied ammonia, the useless ammonia row with workshop reactor 1
Go out pipeline connection, the processing system includes that the primary surface cooler 3, condensation temperature that chilling temperature is 30～60 DEG C is 15～20 DEG C
First-stage condenser 7, condensation temperature be 0～5 DEG C secondary condenser 8, one-level device for drying and filtering 10, secondary drying filter
11st, liquefied ammonia plate type heat exchanger 12, gas-liquid separator 13 and liquefied ammonia holding vessel 14, inlet end and the useless ammonia of the primary surface cooler 3
Gas discharge line is connected, the outlet side pipeline communication of the inlet end of the first-stage condenser 7 and primary surface cooler 3, described two grades
The inlet end of condenser and the outlet side pipeline communication of first-stage condenser, the outlet side of the secondary condenser are simultaneously dry with one-level
The inlet end pipeline communication of dry filter 10, secondary drying filter 11, the one-level device for drying and filtering 10, secondary drying are filtered
The outlet side of device 11 inlet end pipeline communication simultaneously with liquefied ammonia plate type heat exchanger 12, the inlet end of the gas-liquid separator 13 with
The outlet side pipeline communication of liquefied ammonia plate type heat exchanger, the outfan of the gas-liquid separator 13 pass through liquefied ammonia delivery pump 15 and liquefied ammonia
The connecting pipe of 14 pipeline communication of holding vessel, the primary surface cooler 3 and first-stage condenser 7 is provided with the first frequency conversion roots blower 5,
The connecting pipe of the secondary condenser 8 and one-level device for drying and filtering 10 is provided with the second frequency conversion roots blower 9, the gas-liquid separation
The pipeline at output of device 13 is provided with tail gas frequency conversion roots blower 16.The first frequency conversion roots blower 5, the second frequency conversion roots blower
9 and tail gas frequency conversion roots blower 16 be the explosion-proof type roots blower with frequency conversion function.Meanwhile, in order to liquefied ammonia storage is effectively ensured
The purity of liquefied ammonia in tank 14 is deposited, the tail gas frequency conversion roots blower 16 carries out gas circuit company by pipeline and liquefied ammonia holding vessel 14 simultaneously
It is logical, take the remaining ammonia above liquefied ammonia holding vessel 14 in time away, further ensure the purity of liquefied ammonia.Additionally, storing in liquefied ammonia
The liquid nitrogen of tank 14 can outwards be conveyed directly to end user by being connected to the liquefied ammonia delivery pump 15 of liquefied ammonia holding vessel 14, realize
It is without interruption.
As shown in figure 1, the processing system also includes exhaust aftertreatment unit, the exhaust aftertreatment unit includes absorbing
Tower 17, ammonia plate type heat exchanger 20 and tank used for storing ammonia, the inlet end on the absorption tower 17 and the tail gas frequency conversion roots blower 16
Outlet side pipeline communication, the inside on the absorption tower 17 is provided with ammonia circulation pump 18, is provided with the top of the ammonia circulation pump 18
Pure water device for supplying, the outfan on the absorption tower 17 are connected with ammonia plate type heat exchanger 20, the ammonia plate type heat exchanger 20
Simultaneously with the top of absorption tower 17 and tank used for storing ammonia passes through that pipeline is T-shaped to be connected, the T-shaped connectivity part of the pipeline is provided with and carries out ammonia concn
The ammonia concn meter 19 of exhausting control control carries out detection monitoring to ammonia concn, and concentration meets the requirements the ammonia that deliver into just now
Holding vessel 21 is preserved, and the final high concentration ammonia for preparing gained can be conveyed by being connected to the ammonia of ammonia holding vessel 21
Pump 22 is sent at user and is directly used.
As shown in figure 1, the connecting pipe of autoclave 1 and primary surface cooler 3 is provided with B/P EGR Back Pressure Transducer EGR 2, described first
Frequency conversion roots blower 5 and the connecting pipe of the primary surface cooler 3, the primary surface cooler 3 and the first frequency conversion Roots's wind
The connecting pipe of machine 5, the first frequency conversion roots blower 5 and the connecting pipe of the secondary condenser 8, the secondary drying mistake
The connecting pipe of filter 11 and gas-liquid separator 13 is equipped with temperature sensor 4 and positive pressure sensor 6, the B/P EGR Back Pressure Transducer EGR 2
It is electrically connected with the first frequency conversion roots blower 5.
As shown in figure 1, the primary surface cooler 3, first-stage condenser 7 and secondary condenser 8 are equipped with thermometer 23, it is described
Thermometer 23 is arranged on primary surface cooler 3, the exit of 8 coolant of first-stage condenser 7 and secondary condenser.
It is corresponding with the processing system shown in Fig. 1, the processing method that the chemical plant ammonia-contaminated gas are recovered as liquefied ammonia include with
Lower step：
The first step, primary table cold treatment：The useless ammonia of high temperature that workshop reactor 1 is discharged is received, is entered into primary surface cooler 3
Row primary water-cooled cooling, obtain primary table it is cold after useless ammonia, the chilling temperature of the primary surface cooler 3 is 30～60 DEG C；
Second step, frequency conversion voltage stabilizing are processed：The ammonia-contaminated gas after the first frequency conversion roots blower 5 receives primary table cold treatment,
In workshop, the connecting pipe of reactor 1 and primary surface cooler 3 arranges B/P EGR Back Pressure Transducer EGR 2, is passed by the analog quantity of B/P EGR Back Pressure Transducer EGR 2
Transmission function feedback control has the primary roots blower 5 of frequency conversion function, realizes the frequency adjustment of the first frequency conversion roots blower 5, from
And make the ammonia-contaminated gas after primary table cold treatment keep the steady statue of negative pressure；
3rd step, one-level condensation process：Useless ammonia after to frequency conversion voltage stabilizing obtained by second step passes through first frequency conversion Roots's wind
Machine 5 is once pressurizeed and is then sent to first-stage condenser 7 and carries out one-level condensation, obtains the condensed useless ammonia of one-level, described
The condensation temperature of one-level condensation is 15～20 DEG C；
3rd step, B-grade condensation process：Receive the condensed useless ammonia of one-level obtained by the 3rd step and be delivered to secondary condenser 8
B-grade condensation is carried out, the useless ammonia after B-grade condensation is obtained, the condensation temperature of the B-grade condensation is 0～5 DEG C；
4th step, dry filter process：Second frequency conversion Roots's wind is passed through to the useless ammonia after B-grade condensation obtained by the 4th step
Machine 9 carries out secondary pressurized and then while is delivered to one-level device for drying and filtering 10 and secondary drying filter 11 is dried filtration and carries
Pure process, obtains dried useless ammonia；
6th step, cooling liquefaction are processed：Dried useless ammonia obtained by 5th step is delivered to liquefied ammonia plate type heat exchanger 12
Cooling liquefaction is carried out, the liquefied ammonia crude product after liquefying of lowering the temperature is obtained, the temperature of the cooling liquefaction is -15～-40 DEG C；
7th step, gas-liquid separation are processed：Liquefied ammonia crude product conveying obtained by 6th is entered into circulation of qi promoting as gas-liquid separator 13
The isolated highly purified liquefied ammonia of liquid and liquid ammonia pollution, the highly purified liquefied ammonia of gained are delivered to liquefied ammonia holding vessel 14 and are protected
Deposit, the liquid ammonia pollution of gained carries out exhaust aftertreatment by the pressurization extraction of tail gas frequency conversion roots blower 16.
7th step needs the liquid ammonia pollution for carrying out exhaust aftertreatment to deliver in absorption tower 17 after pressurizeing, and is mended by pure water
Pure water supply is carried out to device, absorption cycle process of lowering the temperature is carried out by ammonia heat exchanger and water circulating pump, concentration is finally given
For more than 20% ammonia and can qualified discharge tail gas, the concentration is that more than 20% ammonia is delivered to ammonia holding vessel 21
Preserved, it is described can the tail gas of qualified discharge directly directly discharged by absorption tower 17, it is final to prepare the highly concentrated of gained
Degree ammonia can be directly used by being connected to the ammonium hydroxide delivery pump 22 of ammonia holding vessel 21 and being sent at user.
Primary table cold treatment described in the first step is multistage substep table cold treatment, and the primary surface cooler described in the first step is provided with two
The cooling zone of individual above different temperatures.
B-grade condensation described in one-level condensation process and the 3rd step described in 3rd step is processed and is multi-stage condensing process, the
The cold of two or more different temperatures is equipped with inside the secondary condenser 8 described in first-stage condenser 7 and the 4th step described in three steps
Coagulation zone.
Liquefied ammonia holding vessel 14 described in 7th step is provided with concentration online monitoring instrument, liquefied ammonia in highly purified liquefied ammonia porch
Liquefied ammonia holding vessel 14 is delivered into after concentration is up to standard directly, concentration is not up to standard to come back for secondary cycle separation.
The above, only presently preferred embodiments of the present invention not makees any pro forma restriction to the present invention；It is all
The those of ordinary skill of the industry can shown in by specification accompanying drawing and the above and swimmingly implement the present invention；But, it is all
Those skilled in the art in the range of without departing from technical solution of the present invention, using disclosed above technology contents
A little change, modification and the equivalent variations for developing made, are the Equivalent embodiments of the present invention；Meanwhile, it is all according to the present invention
The change of substantial technological any equivalent variations that above example is made, modification with develop etc., still fall within the present invention's
Within the protection domain of technical scheme.
Claims (10)
1. a kind of chemical plant ammonia-contaminated gas are recovered as the processing method of liquefied ammonia, it is characterised in that comprise the following steps：
The first step, primary table cold treatment：The useless ammonia of high temperature that workshop reactor is discharged is received, and primary is carried out into primary surface cooler
Water-cooled cooling, obtain primary table it is cold after useless ammonia, the chilling temperature of the primary surface cooler is 30～60 DEG C；
Second step, frequency conversion voltage stabilizing are processed：The ammonia-contaminated gas after the first frequency conversion roots blower receives primary table cold treatment, in workshop
The connecting pipe of reactor and primary surface cooler arranges B/P EGR Back Pressure Transducer EGR, is fed back by the analog quantity transfer function of B/P EGR Back Pressure Transducer EGR
Primary roots blower of the control with frequency conversion function, realizes the frequency adjustment of the first frequency conversion roots blower, so as to ensure reactor
The fluctuation of discharge duct negative pressure is little, keeps stable；
3rd step, one-level condensation process：Useless ammonia after to frequency conversion voltage stabilizing obtained by second step is entered by the first frequency conversion roots blower
Once pressurization of going is then sent to first-stage condenser carries out one-level condensation, obtains the condensed useless ammonia of one-level, and the one-level is cold
Solidifying condensation temperature is 15～20 DEG C；
4th step, B-grade condensation process：Receiving the condensed useless ammonia of one-level obtained by the 3rd step and being delivered to secondary condenser is carried out
B-grade condensation, obtains the useless ammonia after B-grade condensation, and the condensation temperature of the B-grade condensation is 0～5 DEG C；
5th step, dry filter process：Useless ammonia after B-grade condensation obtained by 4th step is entered by the second frequency conversion roots blower
Row secondary pressurized is then delivered to one-level device for drying and filtering simultaneously and secondary drying filter is dried filtration purification processes, obtains
To dried useless ammonia；
6th step, cooling liquefaction are processed：Dried useless ammonia obtained by 5th step is delivered to liquefied ammonia plate type heat exchanger to be dropped
Temperature liquefaction, obtains the liquefied ammonia crude product after liquefying of lowering the temperature, and the temperature of the cooling liquefaction is -15～-40 DEG C；
7th step, gas-liquid separation are processed：Liquefied ammonia crude product conveying obtained by 6th step is carried out into gas-liquid point as gas-liquid separator
From highly purified liquefied ammonia and liquid ammonia pollution is obtained, the highly purified liquefied ammonia of gained is delivered to liquefied ammonia holding vessel and is preserved, gained
Liquid ammonia pollution by tail gas frequency conversion roots blower pressurize extraction carry out exhaust aftertreatment.
2. chemical plant ammonia-contaminated gas according to claim 1 are recovered as the processing method of liquefied ammonia, it is characterised in that：7th step
Need the liquid ammonia pollution for carrying out exhaust aftertreatment to deliver in absorption tower after pressurizeing, pure water benefit is carried out by pure water device for supplying
Give, absorption cycle process of lowering the temperature is carried out by ammonia heat exchanger and water circulating pump, the ammonia that concentration is more than 20% is finally given
With can qualified discharge tail gas, the concentration is that more than 20% ammonia is delivered to ammonia holding vessel and is preserved, described reachable
The tail gas of mark discharge is directly directly discharged by absorption tower.
3. chemical plant ammonia-contaminated gas according to claim 2 are recovered as the processing method of liquefied ammonia, it is characterised in that：The first step
The primary table cold treatment is multistage substep table cold treatment, and the primary surface cooler described in the first step is provided with two or more different temperatures
Cooling zone.
4. chemical plant ammonia-contaminated gas according to claim 3 are recovered as the processing method of liquefied ammonia, it is characterised in that：3rd step
B-grade condensation described in described one-level condensation process and the 4th step is processed and is multi-stage condensing process, the one-level described in the 3rd step
The condensing zone of two or more different temperatures is equipped with inside secondary condenser described in condenser and the 4th step.
5. chemical plant ammonia-contaminated gas according to claim 4 are recovered as the processing method of liquefied ammonia, it is characterised in that：7th step
Described liquefied ammonia holding vessel is provided with concentration online monitoring instrument in highly purified liquefied ammonia porch, directly defeated after liquefied ammonia concentration is up to standard
Liquefied ammonia holding vessel is fed into, concentration is not up to standard to come back for secondary cycle separation.
6. a kind of chemical plant ammonia-contaminated gas are recovered as the processing system of liquefied ammonia, connect with the useless ammonia discharge line of workshop reactor
Connect, it is characterised in that：The processing system includes the primary surface cooler that chilling temperature is 30～60 DEG C, first frequency conversion Roots's wind
Machine, condensation temperature be 15～20 DEG C first-stage condenser, the secondary condenser that condensation temperature is 0～5 DEG C, one-level dry filter
Device, secondary drying filter, liquefied ammonia plate type heat exchanger, gas-liquid separator and liquefied ammonia holding vessel, the air inlet of the primary surface cooler
End is connected with useless ammonia discharge line, the outlet side pipeline communication of the inlet end of the first-stage condenser and primary surface cooler, institute
State the inlet end of secondary condenser and the outlet side pipeline communication of first-stage condenser, the outlet side of the secondary condenser simultaneously with
The inlet end pipeline communication of one-level device for drying and filtering, secondary drying filter, the one-level device for drying and filtering, secondary drying are filtered
The outlet side of device inlet end pipeline communication simultaneously with liquefied ammonia plate type heat exchanger, inlet end and the liquefied ammonia plate of the gas-liquid separator
The outlet side pipeline communication of formula heat exchanger, the outfan of the gas-liquid separator is by liquefied ammonia delivery pump and liquefied ammonia holding vessel pipeline
The connecting pipe of connection, the primary surface cooler and first-stage condenser is provided with the first frequency conversion roots blower, the secondary condenser
The second frequency conversion roots blower is provided with the connecting pipe of one-level device for drying and filtering, the pipeline at output of the gas-liquid separator is provided with
Tail gas frequency conversion roots blower.
7. chemical plant ammonia-contaminated gas according to claim 6 are recovered as the processing system of liquefied ammonia, it is characterised in that：The place
Reason system also includes exhaust aftertreatment unit, and the exhaust aftertreatment unit includes absorption tower, ammonia plate type heat exchanger and ammonia
Storage tank, the outlet side pipeline communication of the inlet end on the absorption tower and the tail gas frequency conversion roots blower, the absorption tower it is interior
Portion is provided with ammonia circulation pump, is provided with pure water device for supplying at the top of the ammonia circulation pump, and the outfan on the absorption tower is connected with
Ammonia plate type heat exchanger, the ammonia plate type heat exchanger are connected by pipeline is T-shaped with tank used for storing ammonia with the top of absorption tower simultaneously, institute
State the T-shaped connectivity part of pipeline and be provided with the ammonia concn meter for carrying out ammonia concn exhausting control control.
8. chemical plant ammonia-contaminated gas according to claim 7 are recovered as the processing system of liquefied ammonia, it is characterised in that：High pressure is anti-
Kettle and the connecting pipe of primary surface cooler is answered to be provided with B/P EGR Back Pressure Transducer EGR, the first frequency conversion roots blower and the primary surface cooler
Connecting pipe, the primary surface cooler and the connecting pipe of the first frequency conversion roots blower, the first frequency conversion Roots's wind
Machine is equipped with temperature with the connecting pipe of the connecting pipe of the secondary condenser, the secondary drying filter and gas-liquid separator
Degree sensor and positive pressure sensor, the B/P EGR Back Pressure Transducer EGR are electrically connected with the first frequency conversion roots blower.
9. chemical plant ammonia-contaminated gas according to claim 7 are recovered as the processing system of liquefied ammonia, it is characterised in that：It is described first
Level surface cooler, first-stage condenser and secondary condenser are equipped with thermometer, and it is cold that the thermometer is arranged on primary surface cooler, one-level
The exit of condenser and secondary condenser coolant.
10. chemical plant ammonia-contaminated gas according to claim 8 or claim 9 are recovered as the processing system of liquefied ammonia, it is characterised in that：Institute
State the first frequency conversion roots blower, the second frequency conversion roots blower and tail gas frequency conversion roots blower and be the explosion-proof type with frequency conversion function
Roots blower.
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| CN107648983A (en) * | 2017-10-26 | 2018-02-02 | 祝有法 | A kind of high concentration ammonia-containing exhaust recovery system |
| CN108671576A (en) * | 2018-03-30 | 2018-10-19 | 海宁市英德赛电子有限公司 | A kind of processing unit of liquefied ammonia exhaust gas |
| CN110015668A (en) * | 2019-04-02 | 2019-07-16 | 巫协森 | Primary liquefied ammonia purifying is the method and its system of high purity liquid ammonia |
| CN112600067A (en) * | 2020-12-04 | 2021-04-02 | 江苏大学 | Open type liquid nitrogen spray cooling system for efficient heat dissipation of variable-power low-temperature laser |
| CN112850744A (en) * | 2020-12-29 | 2021-05-28 | 海宁市英德赛电子有限公司 | High-purity ammonia waste gas treatment device |
| CN112815227B (en) * | 2021-01-21 | 2022-12-13 | 北京空间机电研究所 | On-satellite on-line ultra-pure ammonia working medium filling system for two-phase fluid loop system |
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| US3359744A (en) * | 1965-06-16 | 1967-12-26 | Air Prod & Chem | Hydrogen purification system with separated vapor and liquid mixed to provide a heat exchange medium |
| BE754952A (en) * | 1969-08-18 | 1971-02-17 | Uss Eng & Consult | METHOD AND APPARATUS FOR PRODUCING HIGH PURITY CARBON DIOXIDE UNDER HIGH PRESSURE FROM A MIXTURE OF LOW PRESSURE ACID GASES |
| NL9301648A (en) * | 1993-09-24 | 1995-04-18 | Haffmans Bv | Process for preparing pure, gaseous carbon dioxide and apparatus to be used therewith. |
| CN202460430U (en) * | 2011-12-20 | 2012-10-03 | 厦门市格绿科技有限公司 | Industrial waste ammonia recycling system |
| CN102538398B (en) * | 2012-02-09 | 2013-11-06 | 杭州杭氧股份有限公司 | Process and system for purifying, separating and liquefying nitrogen-and-oxygen-containing coal mine methane (CMM) |
| CN202962226U (en) * | 2012-11-28 | 2013-06-05 | 河南骏化发展股份有限公司 | Melamine tail gas recycling system |
| CN203929316U (en) * | 2014-05-26 | 2014-11-05 | 厦门市格绿科技有限公司 | A kind of negative pressure early warning system for ammonia recycling device |
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Denomination of invention: Treatment system for recovering ammonia containing waste gas into liquid ammonia in chemical plant and its treatment method Effective date of registration: 20211123 Granted publication date: 20170322 Pledgee: Bank of China Limited Xiamen Tong'an sub branch Pledgor: XIAMEN GERE TECHNOLOGY CO.,LTD. Registration number: Y2021980013044 |