CN104748507A - 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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- CN104748507A CN104748507A CN201510094398.4A CN201510094398A CN104748507A CN 104748507 A CN104748507 A CN 104748507A CN 201510094398 A CN201510094398 A CN 201510094398A CN 104748507 A CN104748507 A CN 104748507A
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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 refer to that a kind of chemical plant ammonia-contaminated gas is recovered as treatment system and the processing method thereof of liquefied ammonia.
Background technology
Chemical industry occupies critical role in the national economy of various countries, is basic industry and the pillar industry of many countries.The development speed of chemical industry and scale have direct impact to each department socioeconomic, and globalization chemical product annual value of production is more than 15,000 hundred million dollars.Because chemical industry is of a great variety, complex process, product are various, the pollutant kind discharged in production is many, quantity is large, toxicity is high, and therefore, chemical industry is heavy polluter.Meanwhile, chemical products in processing, storage, to use and the links such as offal treatment all likely produces a large amount of noxious material and influence ecological environment, jeopardizes human health.Development of chemical industry is walked sustainable development path and is had important practical significance for human economy, social development.
This technology is the chemical enterprise for there being a large amount of ammonia-containing exhaust to discharge.Conventional processing technique has 1, forms sulfate of ammoniac with the ammonia in sulfuric acid absorption waste gas, but ammonium sulfate need process again, and processing cost is very high.2, the method that washes with water absorbs the ammonia in tail gas, then neutralizes with NAOH the object reaching ammonia nitrogen qualified discharge, but treatment effect is unstable.The poor effect that technology in the past not only processes and the value again do not utilized.This technology both can thorough contaminated solution problem, and can reach the effect turned waste into wealth.
Summary of the invention
The object of this invention is to provide treatment system and processing method thereof that a kind of chemical plant ammonia-contaminated gas is recovered as liquefied ammonia, described processing method has that treatment effect is good, byproduct purity is high, byproduct market value is high and the feature of environmental protection, the feature that described treatment system has simple operation, energy consumption cost is low, intelligence degree is high, security is good and spatial volume is little.
The present invention can be achieved through the following technical solutions:
The invention discloses treatment system and processing method thereof that a kind of chemical plant ammonia-contaminated gas is recovered as liquefied ammonia, the processing method that described chemical plant ammonia-contaminated gas is recovered as liquefied ammonia comprises the following steps:
The first step, elementary table cold treatment: receive high temperature that workshop reactor discharges and to give up ammonia, enter elementary surface cooler and carry out elementary water-cooled cooling, obtain elementary table cold after useless ammonia, the chilling temperature of described elementary surface cooler is 30 ~ 60 DEG C.By elementary table cold treatment, be tentatively cooled to 30 ~ 60 DEG C from the useless ammonia of the temperatures as high 200 DEG C of workshop reactor pipeline discharge.
Second step, frequency conversion voltage stabilizing process: receive ammonia-contaminated gas after elementary table cold treatment by the first frequency conversion roots blower, in the connecting pipe of workshop reactor and elementary surface cooler, B/P EGR Back Pressure Transducer EGR is set, be there is by the analog quantity transfer function FEEDBACK CONTROL of B/P EGR Back Pressure Transducer EGR the elementary roots blower of frequency conversion function, realize the frequency adjustment of the first frequency conversion roots blower, thus make ammonia-contaminated gas after elementary table cold treatment keep the stable state of negative pressure, effectively ensure that the stability of processing procedure ammonia-contaminated gas pressure.
3rd step, one-level condensation process: the useless ammonia of second step gained after frequency conversion voltage stabilizing process is once pressurizeed by the first frequency conversion roots blower and is then delivered to first-stage condenser and carries out one-level condensation, obtain the condensed useless ammonia of one-level, the condensation temperature of described one-level condensation is 15 ~ 20 DEG C.By one-level condensation process, temperature is that the useless ammonia of 30 ~ 60 DEG C is condensed into 15 ~ 20 DEG C further.
4th step, B-grade condensation process: the condensed useless ammonia of reception the 3rd step gained one-level is delivered to secondary condenser and carries out B-grade condensation, and obtain the useless ammonia after B-grade condensation, the condensation temperature of described B-grade condensation is 0 ~ 5 DEG C.By B-grade condensation process, temperature is that the non-ammonia of 15 ~ 20 DEG C is condensed into 0 ~ 5 DEG C further.
5th step, dry filter process: by the second frequency conversion roots blower, secondary pressurized is carried out to the useless ammonia after the 4th step gained B-grade condensation and is then delivered to one-level device for drying and filtering and secondary drying filter carries out dry filter purification processes simultaneously, obtain dried useless ammonia.By dry filter process, effectively to remove in useless ammonia other impurity such as moisture, the purity of useless ammonia is purified.
6th step, cooling liquefaction process: the dried useless ammonia of the 5th step gained is delivered to liquefied ammonia plate type heat exchanger and carries out cooling liquefaction, obtain the thick product of liquefied ammonia of cooling post liquefaction, the temperature of described cooling liquefaction is-15 ~-40 DEG C.By cooling liquefaction process, the ammonia after the 4th step is purified is converted into the thick product of liquefied ammonia, and primary liquefaction completes.
7th step, gas-liquid separation process: the conveying of the thick product of liquefied ammonia of the 6th gained is carried out gas-liquid separation as gas-liquid separator and obtains highly purified liquefied ammonia and liquid ammonia pollution, the highly purified liquefied ammonia of gained is delivered to liquefied ammonia holding vessel and preserves, and the liquid ammonia pollution of gained carries out exhaust aftertreatment by tail gas frequency conversion roots blower pressurization extraction.By gas-liquid separation process, obtain highly purified liquefied ammonia product, described final liquefied ammonia high purity more than 99.9%, has good market value.In order to avoid the liquid ammonia pollution of gas-liquid separation directly discharges the impact caused environment, the liquid ammonia pollution of gained is extracted out by the pressurization of tail gas frequency conversion roots blower and is carried out follow-up vent gas treatment, improves the market value of useless ammonia further,
Further, deliver in absorption tower after needing the liquid ammonia pollution carrying out exhaust aftertreatment to pressurize described in 7th step, pure water supply is carried out by pure water device for supplying, the process of cooling absorption cycle is carried out by ammoniacal liquor heat exchanger and water circulating pump, finally obtain concentration be more than 20% ammoniacal liquor and can the tail gas of qualified discharge, described concentration be more than 20% ammoniacal liquor be delivered to ammoniacal liquor holding vessel and preserve, describedly can directly directly to be discharged by absorption tower the tail gas of qualified discharge.By exhaust aftertreatment, the liquid ammonia pollution after gas-liquid separation is finally absorbed by pure water cooling, and form the concentrated ammonia liquor of high concentration, the concentration of described concentrated ammonia liquor, up to more than 20%, can directly be applied as fertilizer application.Meanwhile, the tail gas after vent gas treatment reaches the discharge standard of national regulation, directly can discharge and can't produce environmental pollution.
Further, elementary table cold treatment described in the first step is the cold treatment of multistage substep table, and the elementary surface cooler described in the first step is provided with the cooling zone of two or more different temperatures.By the cold treatment of multistage substep table, the cooling zone of different temperatures is set, avoids the excessive energy loss caused of temperature difference, improve capacity usage ratio, reduce energy consumption.
Further, the one-level condensation process described in the 3rd step and the B-grade condensation process described in the 4th step are multi-stage condensing process, and the first-stage condenser described in the 3rd step and the inside of the secondary condenser described in the 4th step are equipped with the condensing zone of two or more different temperatures.By multistage fractional condensation process, the cooling zone of different temperatures is set, avoids the excessive energy loss caused of temperature difference, improve capacity usage ratio, reduce energy consumption.
Further, the liquefied ammonia holding vessel described in the 7th step is provided with concentration on-line monitoring instrument in highly purified liquefied ammonia porch, and liquefied ammonia concentration is up to standard directly delivers into liquefied ammonia holding vessel afterwards, and not up to standard the returning of concentration carries out secondary cycle separation.By arranging concentration on-line monitoring instrument, the concentration of liquefied ammonia can be monitored, ensureing that the purity of liquefied ammonia meets the requirement of more than 99.9%, directly can be sent to user by liquefied ammonia delivery pump and directly use, fully ensureing the market value of liquefied ammonia.
Corresponding with the treatment system that described chemical plant ammonia-contaminated gas is recovered as liquefied ammonia, described chemical plant ammonia-contaminated gas is recovered as the treatment system of liquefied ammonia, be connected with the useless ammonia discharge line of workshop reactor, described treatment system comprises the elementary surface cooler that chilling temperature is 30 ~ 60 DEG C, condensation temperature is the first-stage condenser of 15 ~ 20 DEG C, condensation temperature is the secondary condenser of 0 ~ 5 DEG C, one-level device for drying and filtering, secondary drying filter, one-level device for drying and filtering, secondary drying filter, liquefied ammonia plate type heat exchanger, gas-liquid separator and liquefied ammonia holding vessel, the inlet end of described elementary surface cooler is communicated with useless ammonia discharge line, the inlet end of described first-stage condenser and the outlet side pipeline communication of elementary surface cooler, the inlet end of described B-grade condensation pipe and the outlet side pipeline communication of one-level condenser pipe, the outlet side of described B-grade condensation pipe simultaneously with one-level device for drying and filtering, the inlet end pipeline communication of secondary drying filter, described one-level device for drying and filtering, the outlet side of secondary drying filter simultaneously with the inlet end pipeline communication of liquefied ammonia plate type heat exchanger, the outlet side pipeline communication of the inlet end of described gas-liquid separator and the board-like device that skips of liquefied ammonia, the output of described gas-liquid separator is by liquefied ammonia delivery pump and liquefied ammonia holding vessel pipeline communication, the connecting pipe of described elementary surface cooler and first-stage condenser is provided with the first frequency conversion roots blower, the connecting pipe of described secondary condenser and one-level device for drying and filtering is provided with the second frequency conversion roots blower, the pipeline at output of described gas-liquid separator is provided with tail gas frequency conversion roots blower.Whole system carries out material transferring by pipeline, without the need to manually intervening, reducing the convenience of operation and improving the security of operation.By arranging the process of multi-level table cold-peace multi-stage condensing in systems in which, effectively improving capacity usage ratio, reducing the manufacturing cost of product; By arranging the first frequency conversion roots blower, the second frequency conversion roots blower and tail gas frequency conversion roots blower, pressurized treatments is carried out to the course of conveying of useless ammonia, accelerate the transmission of ammonia in pipeline after having processed, both reduced the pressure-bearing risk of explosion in pipeline, accelerate again the handling process of useless ammonia.
Further, described treatment system also comprises exhaust aftertreatment unit, described exhaust aftertreatment unit comprises absorption tower, ammoniacal liquor plate type heat exchanger and tank used for storing ammonia, the inlet end on described absorption tower and the outlet side pipeline communication of described tail gas frequency conversion roots blower, the inside on described absorption tower is provided with ammonia circulation pump, described ammoniacal liquor top is provided with pure water device for supplying, the output on described absorption tower is connected with ammoniacal liquor plate type heat exchanger, described ammoniacal liquor plate type heat exchanger is communicated with by pipeline is T-shaped with tank used for storing ammonia with top, absorption tower simultaneously, the T-shaped connectivity part of described pipeline is provided with the ammonia concn meter carrying out the control of ammonia concn exhausting control.By carrying out absorption process at exhaust aftertreatment unit to tail gas, the ammoniacal liquor finally obtaining high concentration and the tail gas that can directly discharge; By arranging ammonia concn meter, effectively can ensure that ammoniacal liquor enters ammoniacal liquor holding vessel just now and preserves after meeting concentration requirement.
Further, the connecting pipe of described autoclave and elementary surface cooler is provided with B/P EGR Back Pressure Transducer EGR, the connecting pipe of the connecting pipe of described first frequency conversion roots blower and described elementary surface cooler, described elementary surface cooler and the connecting pipe of the connecting pipe of described first frequency conversion roots blower, described first frequency conversion roots blower and described secondary condenser, described secondary drying filter and gas-liquid separator is equipped with temperature sensor and positive pressure sensor, described B/P EGR Back Pressure Transducer EGR and described first frequency conversion roots blower electric connection.By arranging numerous electronic monitoring instrument at different pipeline place, effective monitoring being carried out to the whole process for the treatment of system, ensure that the stability that treatment system is run.Meanwhile, the setting of numerous electronic monitoring instrument, possesses the basis of Based Intelligent Control, and whole treatment system possesses the basis of remote monitoring process.Meanwhile, B/P EGR Back Pressure Transducer EGR and the first frequency conversion roots blower electric connection, can to give up the situation that ammonia discharges from workshop reactor by Real-Time Monitoring, add Wind Volume in time, reduce security risk when discharge rate is excessive.
Further, described elementary surface cooler, first-stage condenser and secondary condenser are equipped with thermometer, and described thermometer is arranged on the exit of elementary surface cooler, first-stage condenser and secondary condenser cooling fluid.By arranging numerous thermometer, effectively can detect the effect of table cold-peace condensation in real time, ensureing the process of process.
Further, described first frequency conversion roots blower, the second frequency conversion roots blower and tail gas frequency conversion roots blower are the explosion-proof type roots blower with frequency conversion function.Adopt explosion-proof type blower fan, effectively ensure the security risk of pipeline pressure-bearing; Described roots blower is frequency conversion fan, effectively reduces the open frequency of blower fan, reduces energy consumption, the service life of extension device.
A kind of chemical plant of the present invention ammonia-contaminated gas is recovered as the processing method of liquefied ammonia, has following beneficial effect:
The first, treatment effect is good, is processed useless ammonia by Multi-stage cooling, filtration and gas-liquid separation, and the ammonia composition in useless ammonia fully liquefies and becomes liquefied ammonia or become ammoniacal liquor by absorbing pure water, effectively completes the process to useless ammonia;
The second, byproduct purity is high, and in the byproduct finally obtained, the purity of liquefied ammonia is 99.9% liquefied ammonia, and the concentration of ammoniacal liquor is more than 20%;
Three, byproduct market value is high, and the processing method adopted is using useless ammonia as raw material, and raw material sources are extensive, and the byproduct purity of gained is excellent, with low cost in addition, has the higher market competitiveness;
Four, environmental protection, by ammonia residual in absorption tower cyclic absorption technology again treatment system, to reach the complete qualified discharge of tail gas, can not cause atmosphere pollution.
A kind of chemical plant of the present invention ammonia-contaminated gas is recovered as treatment system and the processing method thereof of liquefied ammonia, has following beneficial effect:
The first, simple operation, internal system material directly carries out automated material transmission by pipeline, without the need to manually intervening, simple to operate;
The second, energy consumption cost is low, adopts Multi-stage cooling, filtration and gas-liquid separation to carry out Operation system setting to useless ammonia, system thermal recoverable, improves capacity usage ratio and reduce energy consumption cost;
Three, intelligence degree is high, arranges numerous electronic monitoring instrument controlled for some analog quantity monitoring, realize remote monitoring and administration by analog quantity monitoring control point in system;
Four, security is good, and whole system directly carries out material transferring by pipeline, and without the need to manually intervening, treatment system is stable.Early warning and monitoring instrument perfects, and effectively gets rid of potential safety hazard, reduces the generation of the security incidents such as such as leakage;
Five, stability is high, B/P EGR Back Pressure Transducer EGR is provided with between workshop reactor and elementary surface cooler, B/P EGR Back Pressure Transducer EGR is connected with the first frequency conversion roots blower and realizes analog quantity and transmit, and carries out frequency conversion and keeps negative pressure voltage stabilizing state, effectively ensure that the stability of system to the ammonia-contaminated gas of negative pressure state;
Six, spatial volume is little, and in system, each device is connected by pipeline, and each setting position arranges flexibly, the spatial volume occupied by effective compressibility.
Accompanying drawing explanation
Accompanying drawing 1 is the treatment system composition schematic diagram that a kind of chemical plant of the present invention ammonia-contaminated gas is recovered as liquefied ammonia;
Mark in accompanying drawing comprises: 1, reactor, 2, B/P EGR Back Pressure Transducer EGR, 3, elementary surface cooler, 4, temperature sensor, 5, first frequency conversion roots blower, 6, positive pressure sensor, 7, first-stage condenser, 8, secondary condenser, 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 holding vessel, 15, liquefied ammonia delivery pump, 16, tail gas frequency conversion roots blower, 17, absorption tower, 18, ammonia circulation pump, 19, ammonia concn meter, 20, ammoniacal liquor plate type heat exchanger, 21, ammoniacal liquor holding vessel, 22, ammonium hydroxide delivery pump, 23, thermometer.
Detailed description of the invention
In order to make those skilled in the art person understand technical scheme of the present invention better, below in conjunction with embodiment and accompanying drawing, product of the present invention is described in further detail.
The invention discloses treatment system and processing method thereof that a kind of chemical plant ammonia-contaminated gas is recovered as liquefied ammonia, described treatment system and processing method are in correspondence with each other.
As shown in Figure 1, chemical plant ammonia-contaminated gas is recovered as the treatment system of liquefied ammonia, be connected with the useless ammonia discharge line of workshop reactor 1, described treatment system comprises the elementary surface cooler 3 that chilling temperature is 30 ~ 60 DEG C, condensation temperature is the first-stage condenser 7 of 15 ~ 20 DEG C, condensation temperature is the secondary condenser 8 of 0 ~ 5 DEG C, one-level device for drying and filtering 10, secondary drying filter 11, one-level device for drying and filtering 10, secondary drying filter 11, liquefied ammonia plate type heat exchanger 12, gas-liquid separator 13 and liquefied ammonia holding vessel 14, the inlet end of described elementary surface cooler 3 is communicated with useless ammonia discharge line, the inlet end of described first-stage condenser 7 and the outlet side pipeline communication of elementary surface cooler 3, the inlet end of described B-grade condensation pipe and the outlet side pipeline communication of one-level condenser pipe, the outlet side of described B-grade condensation pipe simultaneously with one-level device for drying and filtering 10, the inlet end pipeline communication of secondary drying filter 11, described one-level device for drying and filtering 10, the outlet side of secondary drying filter 11 simultaneously with the inlet end pipeline communication of liquefied ammonia plate type heat exchanger 12, the outlet side pipeline communication of the inlet end of described gas-liquid separator 13 and the board-like device that skips of liquefied ammonia, the output of described gas-liquid separator 13 is by liquefied ammonia delivery pump 15 and liquefied ammonia holding vessel 14 pipeline communication, the connecting pipe of described elementary surface cooler 3 and first-stage condenser 7 is provided with the first frequency conversion roots blower 5, the connecting pipe of described secondary condenser 8 and one-level device for drying and filtering 10 is provided with the second frequency conversion roots blower 9, the pipeline at output of described gas-liquid separator 13 is provided with tail gas frequency conversion roots blower 16.Described first frequency conversion roots blower 5, second frequency conversion roots blower 9 and tail gas frequency conversion roots blower 16 are the explosion-proof type roots blower with frequency conversion function.Simultaneously, in order to effectively ensure the purity of liquefied ammonia in liquefied ammonia holding vessel 14, described tail gas frequency conversion roots blower 16 carries out gas circuit by pipeline with liquefied ammonia holding vessel 14 simultaneously and is communicated with, and takes the remaining ammonia above liquefied ammonia holding vessel 14 in time away, further ensures the purity of liquefied ammonia.In addition, outwards directly can be sent to end user by the liquefied ammonia delivery pump 15 being connected to liquefied ammonia holding vessel 14 at the liquid nitrogen of liquefied ammonia holding vessel 14, realize without interruption.
As shown in Figure 1, described treatment system also comprises exhaust aftertreatment unit, described exhaust aftertreatment unit comprises absorption tower 17, ammoniacal liquor plate type heat exchanger 20 and tank used for storing ammonia, the inlet end on described absorption tower 17 and the outlet side pipeline communication of described tail gas frequency conversion roots blower 16, the inside on described absorption tower 17 is provided with ammonia circulation pump 18, described ammoniacal liquor top is provided with pure water device for supplying, the output on described absorption tower 17 is connected with ammoniacal liquor plate type heat exchanger 20, described ammoniacal liquor plate type heat exchanger 20 is communicated with by pipeline is T-shaped with tank used for storing ammonia with top, absorption tower 17 simultaneously, the T-shaped connectivity part of described pipeline is provided with the ammonia concn meter 19 pairs of ammonia concns carrying out the control of ammonia concn exhausting control and carries out test and monitoring, concentration meets the requirements and delivers into ammoniacal liquor holding vessel 21 just now and preserve, the high concentration ammoniacal liquor finally preparing gained can be sent to user place and directly use by the ammonium hydroxide delivery pump 22 being connected to ammoniacal liquor holding vessel 21.
As shown in Figure 1, described autoclave 1 is provided with B/P EGR Back Pressure Transducer EGR 2 with the connecting pipe of elementary surface cooler 3, described first frequency conversion roots blower 5 is equipped with temperature sensor 4 and positive pressure sensor 6 with the connecting pipe of described first frequency conversion roots blower 5, described first frequency conversion roots blower 5 with the connecting pipe of the connecting pipe of described secondary condenser 8, described secondary drying filter 11 and gas-liquid separator 13, described B/P EGR Back Pressure Transducer EGR 2 and described first frequency conversion roots blower 5 electric connection with the connecting pipe of described elementary surface cooler 3, described elementary surface cooler 3.
As shown in Figure 1, described elementary surface cooler 3, first-stage condenser 7 and secondary condenser 8 are equipped with thermometer 23, and described thermometer 23 is arranged on the exit of elementary surface cooler 3, first-stage condenser 7 and secondary condenser 8 cooling fluid.
Corresponding with the treatment system shown in Fig. 1, the processing method that described chemical plant ammonia-contaminated gas is recovered as liquefied ammonia comprises the following steps:
The first step, elementary table cold treatment: receive high temperature that workshop reactor 1 discharges and to give up ammonia, enter elementary surface cooler 3 and carry out elementary water-cooled cooling, obtain elementary table cold after useless ammonia, the chilling temperature of described elementary surface cooler 3 is 30 ~ 60 DEG C;
Second step, frequency conversion voltage stabilizing process: receive ammonia-contaminated gas after elementary table cold treatment by the first frequency conversion roots blower 5, in the connecting pipe of workshop reactor 1 and elementary surface cooler 3, B/P EGR Back Pressure Transducer EGR 2 is set, be there is by the analog quantity transfer function FEEDBACK CONTROL of B/P EGR Back Pressure Transducer EGR 2 the elementary roots blower 5 of frequency conversion function, realize the frequency adjustment of the first frequency conversion roots blower 5, thus make ammonia-contaminated gas after elementary table cold treatment keep the stable state of negative pressure;
3rd step, one-level condensation process: the useless ammonia after second step gained frequency conversion voltage stabilizing is once pressurizeed by the first frequency conversion roots blower 5 and is then delivered to first-stage condenser 7 and carries out one-level condensation, obtain the condensed useless ammonia of one-level, the condensation temperature of described one-level condensation is 15 ~ 20 DEG C;
4th step, B-grade condensation process: the condensed useless ammonia of reception the 3rd step gained one-level is delivered to secondary condenser 8 and carries out B-grade condensation, and obtain the useless ammonia after B-grade condensation, the condensation temperature of described B-grade condensation is 0 ~ 5 DEG C;
5th step, dry filter process: by the second frequency conversion roots blower 9, secondary pressurized is carried out to the useless ammonia after the 4th step gained B-grade condensation and is then delivered to one-level device for drying and filtering 10 and secondary drying filter 11 carries out dry filter purification processes simultaneously, obtain dried useless ammonia;
6th step, cooling liquefaction process: the dried useless ammonia of the 5th step gained is delivered to liquefied ammonia plate type heat exchanger 12 and carries out cooling liquefaction, obtain the thick product of liquefied ammonia of cooling post liquefaction, the temperature of described cooling liquefaction is-15 ~-40 DEG C;
7th step, gas-liquid separation process: the conveying of the thick product of liquefied ammonia of the 6th gained is carried out gas-liquid separation as gas-liquid separator 13 and obtains highly purified liquefied ammonia and liquid ammonia pollution, the highly purified liquefied ammonia of gained is delivered to liquefied ammonia holding vessel 14 and preserves, and the liquid ammonia pollution of gained carries out exhaust aftertreatment by tail gas frequency conversion roots blower 16 extraction of pressurizeing.
Deliver in absorption tower 17 after needing the liquid ammonia pollution carrying out exhaust aftertreatment to pressurize described in 7th step, pure water supply is carried out by pure water device for supplying, the process of cooling absorption cycle is carried out by ammoniacal liquor heat exchanger and water circulating pump, finally obtain concentration be more than 20% ammoniacal liquor and can the tail gas of qualified discharge, described concentration be more than 20% ammoniacal liquor be delivered to ammoniacal liquor holding vessel 21 and preserve, describedly can directly directly to be discharged by absorption tower 17 tail gas of qualified discharge, the high concentration ammoniacal liquor finally preparing gained can be sent to user place and directly use by the ammonium hydroxide delivery pump 22 being connected to ammoniacal liquor holding vessel 21.
Elementary table cold treatment described in the first step is the cold treatment of multistage substep table, and the elementary surface cooler described in the first step is provided with the cooling zone of two or more different temperatures.
One-level condensation process described in 3rd step and the B-grade condensation process described in the 3rd step are multi-stage condensing process, and the first-stage condenser 7 described in the 3rd step and secondary condenser 8 inside described in the 4th step are equipped with the condensing zone of two or more different temperatures.
Liquefied ammonia holding vessel 14 described in 7th step is provided with concentration on-line monitoring instrument in highly purified liquefied ammonia porch, and liquefied ammonia concentration is up to standard directly delivers into liquefied ammonia holding vessel 14 afterwards, and not up to standard the returning of concentration carries out secondary cycle separation.
The above, be only preferred embodiment of the present invention, not does any pro forma restriction to the present invention; The those of ordinary skill of all industry all can shown in by specification accompanying drawing and the above and implement the present invention swimmingly; But all those skilled in the art are not departing within the scope of technical solution of the present invention, disclosed above technology contents can be utilized and make a little change, modify with differentiation equivalent variations, be Equivalent embodiments of the present invention; Meanwhile, all according to substantial technological of the present invention to the change of any equivalent variations that above embodiment is done, modify and differentiation etc., within the protection domain all still belonging to technical scheme of the present invention.
Claims (10)
1. chemical plant ammonia-contaminated gas is recovered as a processing method for liquefied ammonia, it is characterized in that comprising the following steps:
The first step, elementary table cold treatment: receive high temperature that workshop reactor discharges and to give up ammonia, enter elementary surface cooler and carry out elementary water-cooled cooling, obtain elementary table cold after useless ammonia, the chilling temperature of described elementary surface cooler is 30 ~ 60 DEG C;
Second step, frequency conversion voltage stabilizing process: receive ammonia-contaminated gas after elementary table cold treatment by the first frequency conversion roots blower, in the connecting pipe of workshop reactor and elementary surface cooler, B/P EGR Back Pressure Transducer EGR is set, be there is by the analog quantity transfer function FEEDBACK CONTROL of B/P EGR Back Pressure Transducer EGR the elementary roots blower of frequency conversion function, realize the frequency adjustment of the first frequency conversion roots blower, thus ensure that the fluctuation of reactor discharge duct negative pressure is little, keep stable;
3rd step, one-level condensation process: the useless ammonia after second step gained frequency conversion voltage stabilizing is once pressurizeed by the first frequency conversion roots blower and is then delivered to first-stage condenser and carries out one-level condensation, obtain the condensed useless ammonia of one-level, the condensation temperature of described one-level condensation is 15 ~ 20 DEG C;
4th step, B-grade condensation process: the condensed useless ammonia of reception the 3rd step gained one-level is delivered to secondary condenser and carries out B-grade condensation, and obtain the useless ammonia after B-grade condensation, the condensation temperature of described B-grade condensation is 0 ~ 5 DEG C;
5th step, dry filter process: by the second frequency conversion roots blower, secondary pressurized is carried out to the useless ammonia after the 4th step gained B-grade condensation and is then delivered to one-level device for drying and filtering and secondary drying filter carries out dry filter purification processes simultaneously, obtain dried useless ammonia;
6th step, cooling liquefaction process: the dried useless ammonia of the 5th step gained is delivered to liquefied ammonia plate type heat exchanger and carries out cooling liquefaction, obtain the thick product of liquefied ammonia of cooling post liquefaction, the temperature of described cooling liquefaction is-15 ~-40 DEG C;
7th step, gas-liquid separation process: the conveying of the thick product of liquefied ammonia of the 6th step gained is carried out gas-liquid separation as gas-liquid separator and obtains highly purified liquefied ammonia and liquid ammonia pollution, the highly purified liquefied ammonia of gained is delivered to liquefied ammonia holding vessel and preserves, and the liquid ammonia pollution of gained carries out exhaust aftertreatment by tail gas frequency conversion roots blower pressurization extraction.
2. chemical plant according to claim 1 ammonia-contaminated gas is recovered as the processing method of liquefied ammonia, it is characterized in that: deliver in absorption tower after needing to carry out the liquid ammonia pollution pressurization of exhaust aftertreatment described in the 7th step, pure water supply is carried out by pure water device for supplying, the process of cooling absorption cycle is carried out by ammoniacal liquor heat exchanger and water circulating pump, finally obtain concentration be more than 20% ammoniacal liquor and can the tail gas of qualified discharge, described concentration be more than 20% ammoniacal liquor be delivered to ammoniacal liquor holding vessel and preserve, describedly can directly directly to be discharged by absorption tower the tail gas of qualified discharge.
3. chemical plant according to claim 2 ammonia-contaminated gas is recovered as the processing method of liquefied ammonia, it is characterized in that: elementary table cold treatment described in the first step is the cold treatment of multistage substep table, and the elementary surface cooler described in the first step is provided with the cooling zone of two or more different temperatures.
4. chemical plant according to claim 3 ammonia-contaminated gas is recovered as the processing method of liquefied ammonia, it is characterized in that: the one-level condensation process described in the 3rd step and the B-grade condensation process described in the 4th step are multi-stage condensing process, the first-stage condenser described in the 3rd step and the inside of the secondary condenser described in the 4th step are equipped with the condensing zone of two or more different temperatures.
5. chemical plant according to claim 4 ammonia-contaminated gas is recovered as the processing method of liquefied ammonia, it is characterized in that: the liquefied ammonia holding vessel described in the 7th step is provided with concentration on-line monitoring instrument in highly purified liquefied ammonia porch, liquefied ammonia concentration is up to standard directly delivers into liquefied ammonia holding vessel afterwards, and not up to standard the returning of concentration carries out secondary cycle separation.
6. a chemical plant ammonia-contaminated gas is recovered as the treatment system of liquefied ammonia, be connected with the useless ammonia discharge line of workshop reactor, it is characterized in that: described treatment system comprises the elementary surface cooler that chilling temperature is 30 ~ 60 DEG C, first frequency conversion roots blower, condensation temperature is the first-stage condenser of 15 ~ 20 DEG C, condensation temperature is the secondary condenser of 0 ~ 5 DEG C, one-level device for drying and filtering, secondary drying filter, one-level device for drying and filtering, secondary drying filter, liquefied ammonia plate type heat exchanger, gas-liquid separator and liquefied ammonia holding vessel, the inlet end of described elementary surface cooler is communicated with useless ammonia discharge line, the inlet end of described first-stage condenser and the outlet side pipeline communication of elementary surface cooler, the inlet end of described B-grade condensation pipe and the outlet side pipeline communication of one-level condenser pipe, the outlet side of described B-grade condensation pipe simultaneously with one-level device for drying and filtering, the inlet end pipeline communication of secondary drying filter, described one-level device for drying and filtering, the outlet side of secondary drying filter simultaneously with the inlet end pipeline communication of liquefied ammonia plate type heat exchanger, the outlet side pipeline communication of the inlet end of described gas-liquid separator and the board-like device that skips of liquefied ammonia, the output of described gas-liquid separator is by liquefied ammonia delivery pump and liquefied ammonia holding vessel pipeline communication, the connecting pipe of described elementary surface cooler and first-stage condenser is provided with the first frequency conversion roots blower, the connecting pipe of described secondary condenser and one-level device for drying and filtering is provided with the second frequency conversion roots blower, the pipeline at output of described gas-liquid separator is provided with tail gas frequency conversion roots blower.
7. chemical plant according to claim 6 ammonia-contaminated gas is recovered as the treatment system of liquefied ammonia, it is characterized in that: described treatment system also comprises exhaust aftertreatment unit, described exhaust aftertreatment unit comprises absorption tower, ammoniacal liquor plate type heat exchanger and tank used for storing ammonia, the inlet end on described absorption tower and the outlet side pipeline communication of described tail gas frequency conversion roots blower, the inside on described absorption tower is provided with ammonia circulation pump, described ammoniacal liquor top is provided with pure water device for supplying, the output on described absorption tower is connected with ammoniacal liquor plate type heat exchanger, described ammoniacal liquor plate type heat exchanger is communicated with by pipeline is T-shaped with tank used for storing ammonia with top, absorption tower simultaneously, the T-shaped connectivity part of described pipeline is provided with the ammonia concn meter carrying out the control of ammonia concn exhausting control.
8. chemical plant according to claim 7 ammonia-contaminated gas is recovered as the treatment system of liquefied ammonia, it is characterized in that: the connecting pipe of described autoclave and elementary surface cooler is provided with B/P EGR Back Pressure Transducer EGR, the connecting pipe of described first frequency conversion roots blower and described elementary surface cooler, the connecting pipe of described elementary surface cooler and described first frequency conversion roots blower, the connecting pipe of described first frequency conversion roots blower and described secondary condenser, the connecting pipe of described secondary drying filter and gas-liquid separator is equipped with temperature sensor and positive pressure sensor, described B/P EGR Back Pressure Transducer EGR and described first frequency conversion roots blower electric connection.
9. chemical plant according to claim 7 ammonia-contaminated gas is recovered as the treatment system of liquefied ammonia, it is characterized in that: described elementary surface cooler, first-stage condenser and secondary condenser are equipped with thermometer, described thermometer is arranged on the exit of elementary surface cooler, first-stage condenser and secondary condenser cooling fluid.
10. chemical plant ammonia-contaminated gas is according to claim 8 or claim 9 recovered as the treatment system of liquefied ammonia, it is characterized in that: described first frequency conversion roots blower, the second frequency conversion roots blower and tail gas frequency conversion roots blower are the explosion-proof type roots blower with frequency conversion function.
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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 |