CN113274931A - Acid adding process and system for recovering ammonia in production of ammonium sulfate by saturator method - Google Patents
Acid adding process and system for recovering ammonia in production of ammonium sulfate by saturator method Download PDFInfo
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- CN113274931A CN113274931A CN202110638688.6A CN202110638688A CN113274931A CN 113274931 A CN113274931 A CN 113274931A CN 202110638688 A CN202110638688 A CN 202110638688A CN 113274931 A CN113274931 A CN 113274931A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/60—Safety arrangements
- B01F35/605—Safety devices concerning the operation of the mixer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/49—Mixing systems, i.e. flow charts or diagrams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/81—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
- B01F33/811—Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles in two or more consecutive, i.e. successive, mixing receptacles or being consecutively arranged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/2201—Control or regulation characterised by the type of control technique used
- B01F35/2209—Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
- C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/98—Cooling
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Abstract
The invention relates to an acid-adding process and system for recovering ammonia by producing ammonium sulfate by a saturator method, wherein ammonium sulfate mother liquor used for small circulation in a full-flow tank is pumped out by an acid-preparing circulating pump and enters an acid-adding main loop; 2 acid adding branches are arranged on the acid adding main loop, and jet mixers are respectively arranged on the acid adding main loop and the 2 acid adding branches and are used for mixing and diluting sulfuric acid; under the normal acid adding working condition, independently operating the acid adding main loop; under the working condition of medium acidification, the main acidification loop and the 1 acidification branch are put into operation simultaneously; under the working condition of large acidification, the main acidification loop and the 2 acidification branches are put into operation simultaneously; the 2 acid-adding branches are respectively provided with a cooler at the downstream of the jet mixer along the flowing direction of the liquid, so as to eliminate the dilution heat of the sulfuric acid. The invention can meet the requirements of various working conditions such as normal acidification, medium acidification, large acidification and the like, and can eliminate the dilution heat of the sulfuric acid.
Description
Technical Field
The invention relates to the technical field of ammonia recovery in ammonium sulfate production by a saturator method, in particular to an acid adding process and system for ammonia recovery in ammonium sulfate production by the saturator method.
Background
Ammonia, a nitrogen-containing compound, is a byproduct of the coal coking process. Generally, dry coal contains about 2% of nitrogen, 40-50% of the nitrogen enters raw gas, most ammonia is formed, and a small part of the nitrogen forms hydrogen cyanide and pyridine. Generally, ammonia gas is directly removed from coal gas by adopting a saturator method, as shown in figure 1, a mother liquor circulating pump 2 is used for carrying out large circulation on the entering coal gas at a front chamber of a saturator 1 to directly spray sulfuric acid mother liquor to prepare ammonium sulfate, when the ammonium sulfate mother liquor of the saturator reaches the solubility limit of the ammonium sulfate, ammonium sulfate crystals are separated out, the reaction is a reversible reaction, the ammonium sulfate crystal mother liquor containing the ammonium sulfate crystals is timely sent to a crystallization tank through a crystallization pump 4 to carry out crystallization and precipitation, the ammonium sulfate clear liquor fully flows back to the saturator 1, the precipitated crystal liquor automatically flows to a centrifugal machine to carry out centrifugal separation, the ammonium sulfate crystals are sent to a vibrating fluidized bed dryer, the centrifugal mother liquor and the full flow clear liquor are together returned to the saturator 1, and the concentration of the ammonium sulfate in the mother liquor is reduced; mother liquor overflowing from a liquid full-flow port in the middle of the saturator 1 flows into a liquid seal tank in the full-flow tank and then overflows to the full-flow tank 5, then a small mother liquor circulating pump 3 is used for feeding the mother liquor into a rear chamber of the saturator 1 to carry out small-circulation spraying to continuously recover ammonia gas so as to reach the standard of deamination of outlet coal gas, meanwhile, sulfuric acid is supplemented into the liquid seal tank in the full-flow tank 5, acid tar floating on the liquid surface of the full-flow tank is manually fished out to an acid tar slag tank 6.
The acid adding process commonly used in the present stage is that sulfuric acid is automatically flowed to a liquid seal tank in a full flow tank through a sulfuric acid head tank, so that the acidity of small circulation can be improved, and the standard of gas deamination is reached. The acidity of the ammonium sulfate mother liquor is generally maintained at 4-6 percent, namely the acidity of the large-cycle spraying mother liquor is 4-6 percent, and the acidity of the small-cycle spraying mother liquor can be improved to 6-8 percent due to direct acid addition.
In addition to the normal addition of acid as described above, in the actual production process, the saturator is required to periodically perform the addition of medium acid and the addition of large acid, and is flushed with water and steam to remove the crystal precipitate in the suppressor. Adding acid in the process generally increases the acidity of the ammonium sulfate mother liquor to 12-14 percent, and adding acid in the process generally increases the acidity of the ammonium sulfate mother liquor to 18-22 percent; by adopting the acid adding mode, the problem is not too great under normal operation, but under the condition of medium acid addition and large acid addition, concentrated sulfuric acid and ammonium sulfate mother liquor release a large amount of dilution heat when being mixed in a full flow groove, the boiling fuming phenomenon exists, and the potential safety hazard exists.
Chinese patent application publication No. CN111792652A discloses "an ammonium sulfate acidification system and process", which adopts an injection mixer, and aims to timely release heat generated when concentrated sulfuric acid is mixed with ammonium sulfate mother liquor. But its solution is not reasonable. Firstly, the acid adding of the saturator has three working conditions of normal acid adding, medium acid adding and large acid adding, the injection mixer arranged in the saturator can only meet the normal acid adding working condition, and the most important working conditions of medium acid adding and large acid adding cannot meet the normal acid adding working condition.
In order to reach the standard of gas deamination, sulfuric acid is added to the small circulation as much as possible to improve the acidity of the small circulation ammonium sulfate mother liquor. In order to ensure the flow of the ammonium sulfate mother liquor overflowing from the liquid full flow port in the middle of the saturator and remove acid tar generated by the reaction, the ammonium sulfate mother liquor with small circulation is adopted to dilute sulfuric acid as much as possible. The resistance of the injection mixer is large, and if the delivery lift of the mother liquor circulating pump and the small mother liquor circulating pump is low, the pressure requirement of the injection mixer cannot be met. If a circulating mixing mode is adopted, the pressure of a sulfuric acid pipeline generated by a sulfuric acid overhead tank can not meet the process requirement.
Disclosure of Invention
The invention provides an acid adding process and system for recovering ammonia by producing ammonium sulfate through a saturator method, which adopt ammonium sulfate mother liquor for small circulation to continuously mix and dilute supplemented sulfuric acid through an injection mixer, can meet the requirements of various working conditions such as normal acid adding, medium acid adding, large acid adding and the like through the matched application of 3 injection mixers, and is additionally provided with a cooler for eliminating the dilution heat of the sulfuric acid.
In order to achieve the purpose, the invention adopts the following technical scheme:
an acid-adding process for recovering ammonia from ammonium sulfate produced by a saturator method is characterized in that ammonium sulfate mother liquor used for small circulation in a full-flow tank is pumped out by an acid-preparing circulating pump and enters an acid-adding main loop; 2 acid adding branches are arranged on the acid adding main loop, and jet mixers are respectively arranged on the acid adding main loop and the 2 acid adding branches and are used for mixing and diluting sulfuric acid; under the normal acid adding working condition, independently operating the acid adding main loop; under the working condition of medium acidification, the main acidification loop and the 1 acidification branch are put into operation simultaneously; under the working condition of large acidification, the main acidification loop and the 2 acidification branches are put into operation simultaneously; the 2 acid-adding branches are respectively provided with a cooler at the downstream of the jet mixer along the flowing direction of the liquid, so as to eliminate the dilution heat of the sulfuric acid.
An acid adding process for recovering ammonia in ammonium sulfate production by a saturator method specifically comprises the following steps:
1) pumping out ammonium sulfate mother liquor used for small circulation in the full-flow tank through an acid preparation circulating pump, and feeding the ammonium sulfate mother liquor into an acid adding main loop for diluting supplemented concentrated sulfuric acid;
2) the main acid adding loop is provided with a No. 1 jet mixer, the 2 acid adding branches are respectively provided with a No. 2 jet mixer and a No. 3 jet mixer, when the No. 1 jet mixer is put into use, the normal acid adding requirement can be met, and when the No. 1 jet mixer and the No. 2 jet mixer are put into use simultaneously, the acid adding requirement can be met; when the No. 1 jet mixer, the No. 2 jet mixer and the No. 3 jet mixer are simultaneously put into the mixer, the requirement of large acid addition can be met;
3) a 1# cooler is arranged on a first acid adding branch downstream of the 2# jet mixer and is used for eliminating dilution heat generated during acid adding; a 2# cooler is arranged on an acid adding branch II downstream of the 3# jet mixer and is used for eliminating dilution heat generated during large acid adding;
4) pumping sulfuric acid from a sulfuric acid storage tank by a sulfuric acid pump, conveying the sulfuric acid into a No. 1 jet mixer through a sulfuric acid main pipeline, conveying the sulfuric acid into a No. 2 jet mixer through a sulfuric acid branch pipe I, and conveying the sulfuric acid into a No. 3 jet mixer through a sulfuric acid branch pipe II; the sulfuric acid pump adopts a metering pump controlled by frequency conversion, and meets different working condition requirements by adjusting the outlet flow of the sulfuric acid pump;
5) a 1# regulating valve is arranged on the first sulfuric acid branch pipe to regulate the flow of sulfuric acid entering the 2# jet mixer so as to meet the requirement of adding acid; a No. 2 regulating valve is arranged on the second sulfuric acid branch pipe to regulate the flow of sulfuric acid entering the No. 3 jet mixer so as to meet the requirement of large acid addition;
6) during normal acid adding operation, starting an acid preparation circulating pump and a sulfuric acid pump, pumping out ammonium sulfate mother liquor in the full flow tank, mixing the ammonium sulfate mother liquor with sulfuric acid in a No. 1 jet mixer, and returning mixed liquor to the full flow tank; the flow rate of the sulfuric acid entering the No. 1 jet mixer is adjusted by controlling the rotating speed of a sulfuric acid pump;
7) during the acid adding operation, starting an acid preparation circulating pump and a sulfuric acid pump, pumping out ammonium sulfate mother liquor in the full flow tank, firstly feeding the ammonium sulfate mother liquor into a No. 1 jet mixer to be mixed with sulfuric acid for the first time, feeding a primary mixed liquor into a No. 2 jet mixer to be mixed with the sulfuric acid for the second time, and returning the secondary mixed liquor to the full flow tank; the total flow of acid is controlled by adjusting the rotating speed of a sulfuric acid pump, and the flow of sulfuric acid entering a No. 2 jet mixer is adjusted by a No. 1 adjusting valve;
8) when the acid is added greatly, starting an acid preparation circulating pump and a sulfuric acid pump, pumping out ammonium sulfate mother liquor in a full-flow tank, firstly feeding the ammonium sulfate mother liquor into a No. 1 jet mixer to be mixed with sulfuric acid for the first time, feeding a primary mixed liquor into a No. 2 jet mixer to be mixed with the sulfuric acid for the second time, and feeding a secondary mixed liquor into a No. 3 jet mixer to be mixed with the sulfuric acid for the third time; returning the third mixed liquid to the full flow tank; the total flow of acid is controlled by adjusting the rotating speed of a sulfuric acid pump, and the flow of sulfuric acid entering a No. 2 jet mixer is adjusted by a No. 1 adjusting valve; the flow of sulfuric acid into the # 3 jet mixer was regulated by a # 2 regulating valve.
The acid adding system for realizing the process comprises a full-flow tank, an acid preparation circulating pump, a sulfuric acid storage tank, a sulfuric acid pump, a 1# jet mixer, a 2# jet mixer, a 3# jet mixer, a 1# cooler, a 2# cooler, a 1# regulating valve and a 2# regulating valve;
the full-flow groove is provided with a circulating liquid outlet and a circulating liquid inlet, the circulating liquid outlet is connected with the circulating liquid inlet through an acid adding main loop, and a No. 1 jet mixer, a valve I and a valve II are sequentially arranged on the acid adding main loop along the liquid flowing direction; the acid adding main loops at two ends of the first valve are connected through a first acid adding branch, and a third valve, a 2# jet mixer, a 1# cooler and a fourth valve are sequentially arranged on the first acid adding branch along the liquid flowing direction; the acid adding main loops at two ends of the second valve are connected through a second acid adding branch, and a fifth valve, a 3# jet mixer, a 2# cooler and a sixth valve are sequentially arranged on the second acid adding branch along the liquid flowing direction;
the sulfuric acid storage tank is provided with a sulfuric acid outlet and is connected with a sulfuric acid inlet of the No. 1 jet mixer through a sulfuric acid main pipeline, and a sulfuric acid pump, a sulfuric acid outlet II and a sulfuric acid outlet I are sequentially arranged on the sulfuric acid main pipeline along the flowing direction of sulfuric acid; a first flow recording and adjusting instrument is arranged on a main sulfuric acid pipeline at the downstream of the sulfuric acid pump; the sulfuric acid pump and the flow recording and adjusting instrument are controlled in an interlocking manner;
the sulfuric acid outlet is connected with a sulfuric acid inlet of the No. 2 injection mixer through a sulfuric acid branch pipe I, and a No. 1 regulating valve and a flow recording regulating instrument II are sequentially arranged on the sulfuric acid branch pipe I along the flow direction of sulfuric acid; and the 1# regulating valve and the flow recording regulating instrument are controlled in a dual-locking way;
the first sulfuric acid outlet is connected with a sulfuric acid inlet of the 3# jet mixer through a second sulfuric acid branch pipe, and a third 2# regulating valve and a third flow recording and regulating instrument are sequentially arranged on the second sulfuric acid branch pipe along the flow direction of sulfuric acid; and the No. 2 regulating valve and the flow recording regulating instrument are controlled in a triple lock mode.
Compared with the prior art, the invention has the beneficial effects that:
1) the requirements of various working conditions such as normal acid addition, medium acid addition and large acid addition can be met by the matched application of the 3 jet mixers;
2) aiming at various working conditions, full-automatic control can be realized, the operation system of the original system is not influenced, and the labor productivity is improved;
3) the cooler is arranged to eliminate the dilution heat of the sulfuric acid, so that the possibility of danger caused by boiling phenomenon due to a large amount of dilution heat released when the concentrated sulfuric acid is mixed with the ammonium sulfate mother liquor under the working conditions of medium acidification and large acidification is avoided.
Drawings
FIG. 1 is a schematic diagram of a process for recovering ammonia from ammonium sulfate by a saturator method using the acid addition process of the present invention.
In the figure: 1. saturator 2, mother liquor circulating pump 3, small mother liquor circulating pump 4, crystallizing pump 5, full flow groove 6, acid tar slag box 7, acid-distributing circulating pump 8, sulfuric acid storage tank 9, sulfuric acid pump 10.1# jet mixer 11.2# jet mixer 12.3# jet mixer 13.1# cooler 14.2# cooler 15.1# regulating valve 16.2# regulating valve 17, valve one 18, valve two 19, valve three 20, valve four 21, valve five 22, valve six FRC01, flow recording regulating instrument one FRC02, flow recording regulating instrument two FRC03, flow recording regulating instrument three
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
the invention relates to an acid-adding process for recovering ammonia by producing ammonium sulfate by a saturator method, wherein ammonium sulfate mother liquor used for small circulation in a full-flow tank 5 is pumped out by an acid-matching circulating pump 7 and enters an acid-adding main loop; 2 acid adding branches are arranged on the acid adding main loop, and jet mixers are respectively arranged on the acid adding main loop and the 2 acid adding branches and are used for mixing and diluting sulfuric acid; under the normal acid adding working condition, independently operating the acid adding main loop; under the working condition of medium acidification, the main acidification loop and the 1 acidification branch are put into operation simultaneously; under the working condition of large acidification, the main acidification loop and the 2 acidification branches are put into operation simultaneously; the 2 acid-adding branches are respectively provided with a cooler at the downstream of the jet mixer along the flowing direction of the liquid, so as to eliminate the dilution heat of the sulfuric acid.
As shown in fig. 1, the acid adding process for recovering ammonia in the production of ammonium sulfate by a saturator method, provided by the invention, specifically comprises the following steps:
1) pumping out ammonium sulfate mother liquor used for small circulation in the full-flow tank 5 through an acid preparation circulating pump 7, and feeding the ammonium sulfate mother liquor into an acid adding main loop for diluting supplemented concentrated sulfuric acid;
2) the main acidification loop is provided with a No. 1 jet mixer 10, 2 acid addition branches are respectively provided with a No. 2 jet mixer 11 and a No. 3 jet mixer 12, when the No. 1 jet mixer 10 is put into operation, the normal acidification requirement can be met, and when the No. 1 jet mixer 10 and the No. 2 jet mixer 11 are put into operation simultaneously, the acidification requirement can be met; when the No. 1 jet mixer 10, the No. 2 jet mixer 11 and the No. 3 jet mixer 12 are simultaneously put in, the requirement of adding acid greatly can be met;
3) a 1# cooler 13 is arranged on the acid adding branch line I at the downstream of the 2# jet mixer 11 and is used for eliminating dilution heat generated during acid adding; a 2# cooler 14 is arranged on the acid adding branch II downstream of the 3# jet mixer 12 and is used for eliminating dilution heat generated during large acid adding;
4) pumping sulfuric acid from a sulfuric acid storage tank 8 by a sulfuric acid pump 9, conveying the sulfuric acid into a No. 1 jet mixer 10 through a sulfuric acid main pipeline, conveying the sulfuric acid into a No. 2 jet mixer 11 through a sulfuric acid branch pipe I, and conveying the sulfuric acid into a No. 3 jet mixer 12 through a sulfuric acid branch pipe II; the sulfuric acid pump 9 adopts a metering pump controlled by frequency conversion, and meets different working condition requirements by adjusting the outlet flow of the sulfuric acid pump;
5) a 1# regulating valve 15 is arranged on the first sulfuric acid branch pipe to regulate the flow of sulfuric acid entering the 2# jet mixer 11 so as to meet the requirement of adding acid; a 2# regulating valve 16 is arranged on the second sulfuric acid branch pipe to regulate the flow of the sulfuric acid entering the 3# jet mixer 12 so as to meet the requirement of adding acid greatly;
6) during normal acid adding operation, starting an acid preparation circulating pump 7 and a sulfuric acid pump 9, pumping out ammonium sulfate mother liquor in the full-flow tank 5, mixing the ammonium sulfate mother liquor with sulfuric acid in a No. 1 jet mixer 10, and returning mixed liquor to the full-flow tank 5; the flow rate of the sulfuric acid entering the No. 1 jet mixer 10 is adjusted by controlling the rotating speed of the sulfuric acid pump 9;
7) during the acid adding operation, starting an acid preparation circulating pump 7 and a sulfuric acid pump 9, pumping out ammonium sulfate mother liquor in the full-flow tank 5, firstly feeding the ammonium sulfate mother liquor into a No. 1 jet mixer 10 to be mixed with sulfuric acid for the first time, feeding a primary mixed liquor into a No. 2 jet mixer 11 to be mixed with the sulfuric acid for the second time, and returning the secondary mixed liquor to the full-flow tank 5; the total flow of the acid is controlled by adjusting the rotating speed of the sulfuric acid pump 9, and the flow of the sulfuric acid entering the No. 2 jet mixer 11 is adjusted by the No. 1 adjusting valve 15;
8) when the acid is added greatly, starting an acid preparation circulating pump 7 and a sulfuric acid pump 9, pumping out ammonium sulfate mother liquor in the full flow tank 5, firstly feeding the ammonium sulfate mother liquor into a No. 1 jet mixer 10 to be mixed with sulfuric acid for the first time, feeding a primary mixed liquor into a No. 2 jet mixer 11 to be mixed with the sulfuric acid for the second time, and feeding a secondary mixed liquor into a No. 3 jet mixer 12 to be mixed with the sulfuric acid for the third time; the third mixed liquid returns to the full flow groove 5; the total flow of acid is controlled by adjusting the rotating speed of a sulfuric acid pump 9, and the flow of sulfuric acid entering a No. 2 jet mixer 11 is adjusted by a No. 1 adjusting valve 1 and 5; the flow of sulfuric acid into the # 3 eductor 12 is regulated by the # 2 regulator valve 16.
As shown in fig. 1 (a part is indicated by a dashed line), the acid adding system for implementing the process of the present invention comprises a full flow tank 5, an acid preparation circulating pump 7, a sulfuric acid storage tank 8, a sulfuric acid pump 9, a 1# jet mixer 10, a 2# jet mixer 11, a 3# jet mixer 12, a 1# cooler 13, a 2# cooler 14, a 1# regulating valve 15 and a 2# regulating valve 16;
the full-flow groove 5 is provided with a circulating liquid outlet and a circulating liquid inlet, the circulating liquid outlet is connected with the circulating liquid inlet through an acid adding main loop, and a No. 1 jet mixer 10, a valve I17 and a valve II 18 are sequentially arranged on the acid adding main loop along the liquid flowing direction; the acid adding main loops at two ends of the first valve 17 are connected through a first acid adding branch, and a third valve 19, a 2# jet mixer 11, a 1# cooler 13 and a fourth valve 20 are sequentially arranged on the first acid adding branch along the liquid flowing direction; the acid adding main loops at two ends of the second valve 18 are connected through a second acid adding branch, and a fifth valve 21, a 3# jet mixer 12, a 2# cooler 14 and a sixth valve 22 are sequentially arranged on the second acid adding branch along the liquid flowing direction;
the sulfuric acid storage tank 8 is provided with a sulfuric acid outlet and is connected with a sulfuric acid inlet of a No. 1 jet mixer 10 through a sulfuric acid main pipeline, and a sulfuric acid pump 9, a sulfuric acid outlet II and a sulfuric acid outlet I are sequentially arranged on the sulfuric acid main pipeline along the flowing direction of sulfuric acid; a flow recording and adjusting instrument FRC01 is arranged on the main sulfuric acid pipeline at the downstream of the sulfuric acid pump 9; the sulfuric acid pump 9 and the flow recording and adjusting instrument FRC01 are controlled in an interlocking way;
the sulfuric acid outlet is connected with the sulfuric acid inlet of the No. 2 injection mixer 11 through a sulfuric acid branch pipe I, and a No. 1 regulating valve 15 and a flow recording regulating instrument II FRC02 are sequentially arranged on the sulfuric acid branch pipe I along the flow direction of the sulfuric acid; the 1# regulating valve 15 and the flow recording regulating instrument II FRC02 are controlled in an interlocking mode;
the first sulfuric acid outlet is connected with a sulfuric acid inlet of the 3# jet mixer 12 through a second sulfuric acid branch pipe, and a 2# regulating valve 16 and a flow recording regulating instrument three FRC03 are sequentially arranged on the second sulfuric acid branch pipe along the flow direction of sulfuric acid; and the 2# regulating valve 16 is controlled in interlock with the flow recording regulating meter three FRC03.
As shown in fig. 1, under normal operation condition, the complex acid circulating pump 7 is started, the main acid-adding loop is put into operation, and the flow path of the ammonium sulfate mother liquor is as follows: flow-through tank 5 → acid-blending circulating pump 7 → jet mixer # 1 10 → valve one 17 → valve two 18 → flow-through tank 5; in the process, the sulfuric acid pump 9 is started, sulfuric acid is supplemented into the ammonium sulfate mother liquor through the No. 1 jet mixer, and the sulfuric acid flow is adjusted by the sulfuric acid pump 9 controlled by frequency conversion.
Under the acid adding working condition, the acid preparation circulating pump 7 is started, the acid adding main loop and the acid adding branch circuit I are put into operation, and the flow path of the ammonium sulfate mother liquor is as follows: the flow-through tank 5 → the acid-blending circulation pump 7 → the jet mixer # 1 10 → the valve three 19 → the jet mixer # 2 11 → the cooler # 1 13 → the valve four 20 → the valve two 18 → the flow-through tank 5; in this process, the sulfuric acid pump 9 is started, sulfuric acid is supplemented to the ammonium sulfate mother liquor through the 1# jet mixer 10 and the 2# jet mixer 11, the total flow rate of the added acid is adjusted by the sulfuric acid pump 9 controlled by a variable frequency, and the injection flow rate of the sulfuric acid in the 2# jet mixer 11 is adjusted by the 1# adjusting valve 15.
Under the working condition of large acid addition, starting the acid preparation circulating pump 7, and putting the acid addition main loop and the 2 acid addition branches into operation; the flow path of the ammonium sulfate mother liquor is as follows: the full flow tank 5 → the acid-mixing circulation pump 7 → the jet mixer # 1 10 → the valve three 19 → the jet mixer # 2 11 → the cooler # 1 13 → the valve four 20 → the valve five 21 → the jet mixer # 3 12 → the cooler # 2 14 → the valve six 22 → the full flow tank 5; in this process, the sulfuric acid pump 9 is started, sulfuric acid is supplied to the ammonium sulfate mother liquor through the 1# jet mixer 10, the 2# jet mixer 11, and the 3# jet mixer 12, the total flow rate of the added acid is adjusted by the sulfuric acid pump 9 controlled by the inverter, the injection flow rate of sulfuric acid in the 2# jet mixer 11 is adjusted by the 1# adjusting valve 15, and the injection flow rate of sulfuric acid in the 3# jet mixer 12 is adjusted by the 2# adjusting valve 16.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. An acid-adding process for recovering ammonia in ammonium sulfate production by a saturator method is characterized in that ammonium sulfate mother liquor for small circulation in a full-flow tank is pumped out by an acid-matching circulating pump and enters an acid-adding main loop; 2 acid adding branches are arranged on the acid adding main loop, and jet mixers are respectively arranged on the acid adding main loop and the 2 acid adding branches and are used for mixing and diluting sulfuric acid; under the normal acid adding working condition, independently operating the acid adding main loop; under the working condition of medium acidification, the main acidification loop and the 1 acidification branch are put into operation simultaneously; under the working condition of large acidification, the main acidification loop and the 2 acidification branches are put into operation simultaneously; the 2 acid-adding branches are respectively provided with a cooler at the downstream of the jet mixer along the flowing direction of the liquid, so as to eliminate the dilution heat of the sulfuric acid.
2. The acid adding process for recovering ammonia from ammonium sulfate produced by the saturator method according to claim 1, specifically comprising:
1) pumping out ammonium sulfate mother liquor used for small circulation in the full-flow tank through an acid preparation circulating pump, and feeding the ammonium sulfate mother liquor into an acid adding main loop for diluting supplemented concentrated sulfuric acid;
2) the main acid adding loop is provided with a No. 1 jet mixer, the 2 acid adding branches are respectively provided with a No. 2 jet mixer and a No. 3 jet mixer, when the No. 1 jet mixer is put into use, the normal acid adding requirement can be met, and when the No. 1 jet mixer and the No. 2 jet mixer are put into use simultaneously, the acid adding requirement can be met; when the No. 1 jet mixer, the No. 2 jet mixer and the No. 3 jet mixer are simultaneously put into the mixer, the requirement of large acid addition can be met;
3) a 1# cooler is arranged on a first acid adding branch downstream of the 2# jet mixer and is used for eliminating dilution heat generated during acid adding; a 2# cooler is arranged on an acid adding branch II downstream of the 3# jet mixer and is used for eliminating dilution heat generated during large acid adding;
4) pumping sulfuric acid from a sulfuric acid storage tank by a sulfuric acid pump, conveying the sulfuric acid into a No. 1 jet mixer through a sulfuric acid main pipeline, conveying the sulfuric acid into a No. 2 jet mixer through a sulfuric acid branch pipe I, and conveying the sulfuric acid into a No. 3 jet mixer through a sulfuric acid branch pipe II; the sulfuric acid pump adopts a metering pump controlled by frequency conversion, and meets different working condition requirements by adjusting the outlet flow of the sulfuric acid pump;
5) a 1# regulating valve is arranged on the first sulfuric acid branch pipe to regulate the flow of sulfuric acid entering the 2# jet mixer so as to meet the requirement of adding acid; a No. 2 regulating valve is arranged on the second sulfuric acid branch pipe to regulate the flow of sulfuric acid entering the No. 3 jet mixer so as to meet the requirement of large acid addition;
6) during normal acid adding operation, starting an acid preparation circulating pump and a sulfuric acid pump, pumping out ammonium sulfate mother liquor in the full flow tank, mixing the ammonium sulfate mother liquor with sulfuric acid in a No. 1 jet mixer, and returning mixed liquor to the full flow tank; the flow rate of the sulfuric acid entering the No. 1 jet mixer is adjusted by controlling the rotating speed of a sulfuric acid pump;
7) during the acid adding operation, starting an acid preparation circulating pump and a sulfuric acid pump, pumping out ammonium sulfate mother liquor in the full flow tank, firstly feeding the ammonium sulfate mother liquor into a No. 1 jet mixer to be mixed with sulfuric acid for the first time, feeding a primary mixed liquor into a No. 2 jet mixer to be mixed with the sulfuric acid for the second time, and returning the secondary mixed liquor to the full flow tank; the total flow of acid is controlled by adjusting the rotating speed of a sulfuric acid pump, and the flow of sulfuric acid entering a No. 2 jet mixer is adjusted by a No. 1 adjusting valve;
8) when the acid is added greatly, starting an acid preparation circulating pump and a sulfuric acid pump, pumping out ammonium sulfate mother liquor in a full-flow tank, firstly feeding the ammonium sulfate mother liquor into a No. 1 jet mixer to be mixed with sulfuric acid for the first time, feeding a primary mixed liquor into a No. 2 jet mixer to be mixed with the sulfuric acid for the second time, and feeding a secondary mixed liquor into a No. 3 jet mixer to be mixed with the sulfuric acid for the third time; returning the third mixed liquid to the full flow tank; the total flow of acid is controlled by adjusting the rotating speed of a sulfuric acid pump, and the flow of sulfuric acid entering a No. 2 jet mixer is adjusted by a No. 1 adjusting valve; the flow of sulfuric acid into the # 3 jet mixer was regulated by a # 2 regulating valve.
3. The acid adding system for realizing the process as claimed in claim 1 or 2, which comprises a full flow tank, an acid preparation circulating pump, a sulfuric acid storage tank, a sulfuric acid pump, a No. 1 jet mixer, a No. 2 jet mixer, a No. 3 jet mixer, a No. 1 cooler, a No. 2 cooler, a No. 1 regulating valve and a No. 2 regulating valve;
the full-flow groove is provided with a circulating liquid outlet and a circulating liquid inlet, the circulating liquid outlet is connected with the circulating liquid inlet through an acid adding main loop, and a No. 1 jet mixer, a valve I and a valve II are sequentially arranged on the acid adding main loop along the liquid flowing direction; the acid adding main loops at two ends of the first valve are connected through a first acid adding branch, and a third valve, a 2# jet mixer, a 1# cooler and a fourth valve are sequentially arranged on the first acid adding branch along the liquid flowing direction; the acid adding main loops at two ends of the second valve are connected through a second acid adding branch, and a fifth valve, a 3# jet mixer, a 2# cooler and a sixth valve are sequentially arranged on the second acid adding branch along the liquid flowing direction;
the sulfuric acid storage tank is provided with a sulfuric acid outlet and is connected with a sulfuric acid inlet of the No. 1 jet mixer through a sulfuric acid main pipeline, and a sulfuric acid pump, a sulfuric acid outlet II and a sulfuric acid outlet I are sequentially arranged on the sulfuric acid main pipeline along the flowing direction of sulfuric acid; a first flow recording and adjusting instrument is arranged on a main sulfuric acid pipeline at the downstream of the sulfuric acid pump; the sulfuric acid pump and the flow recording and adjusting instrument are controlled in an interlocking manner;
the sulfuric acid outlet is connected with a sulfuric acid inlet of the No. 2 injection mixer through a sulfuric acid branch pipe I, and a No. 1 regulating valve and a flow recording regulating instrument II are sequentially arranged on the sulfuric acid branch pipe I along the flow direction of sulfuric acid; and the 1# regulating valve and the flow recording regulating instrument are controlled in a dual-locking way;
the first sulfuric acid outlet is connected with a sulfuric acid inlet of the 3# jet mixer through a second sulfuric acid branch pipe, and a third 2# regulating valve and a third flow recording and regulating instrument are sequentially arranged on the second sulfuric acid branch pipe along the flow direction of sulfuric acid; and the No. 2 regulating valve and the flow recording regulating instrument are controlled in a triple lock mode.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653298A (en) * | 2022-04-12 | 2022-06-24 | 广东韶钢松山股份有限公司 | Acid preparation method for preventing saturator from being blocked and coal gas washing equipment |
| CN114713577A (en) * | 2022-04-25 | 2022-07-08 | 广东韶钢松山股份有限公司 | Cleaning method of coal gas deamination equipment |
| CN114735720A (en) * | 2022-04-25 | 2022-07-12 | 云南云天化云峰化工有限公司 | Method and system for producing granular ammonium sulfate by drum granulation through circulating neutralization method |
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2021
- 2021-06-08 CN CN202110638688.6A patent/CN113274931A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653298A (en) * | 2022-04-12 | 2022-06-24 | 广东韶钢松山股份有限公司 | Acid preparation method for preventing saturator from being blocked and coal gas washing equipment |
| CN114713577A (en) * | 2022-04-25 | 2022-07-08 | 广东韶钢松山股份有限公司 | Cleaning method of coal gas deamination equipment |
| CN114735720A (en) * | 2022-04-25 | 2022-07-12 | 云南云天化云峰化工有限公司 | Method and system for producing granular ammonium sulfate by drum granulation through circulating neutralization method |
| CN114735720B (en) * | 2022-04-25 | 2023-08-18 | 云南云天化云峰化工有限公司 | Method and system for producing granular ammonium sulfate by rotary drum granulation through cyclic neutralization method |
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