CN108970441A - A kind of design method of denitrogenation urea solution preparing device - Google Patents

A kind of design method of denitrogenation urea solution preparing device Download PDF

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Publication number
CN108970441A
CN108970441A CN201710404519.XA CN201710404519A CN108970441A CN 108970441 A CN108970441 A CN 108970441A CN 201710404519 A CN201710404519 A CN 201710404519A CN 108970441 A CN108970441 A CN 108970441A
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CN
China
Prior art keywords
urea
unit
amount
volume
dissolving tank
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CN201710404519.XA
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Chinese (zh)
Inventor
徐岩
周建锋
杨春雨
邹红果
佟园园
田晓曼
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Datang Environment Industry Group Co Ltd
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Datang Environment Industry Group Co Ltd
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Priority to CN201710404519.XA priority Critical patent/CN108970441A/en
Publication of CN108970441A publication Critical patent/CN108970441A/en
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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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F21/00—Dissolving
    • B01F21/10—Dissolving using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F21/00—Dissolving
    • B01F21/30—Workflow diagrams or layout of plants, e.g. flow charts; Details of workflow diagrams or layout of plants, e.g. controlling means
    • 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
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/7544—Discharge mechanisms characterised by the means for discharging the components from the mixer using pumps
    • 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
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/08—Preparation of ammonia from nitrogenous organic substances
    • C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea

Abstract

The invention proposes a kind of design method of denitrogenation urea solution preparing device, including between design urea storage, the parameter of bucket elevator, urea dissolving tank, dissolution jar agitator, urea dissolution pump, urea liquid storage tank, urea liquid delivery pump；The design method, which has, to be calculated simply, accurate feature, the easily designed computer program of design method according to the present invention, it can be realized the automation of required lectotype selection, it solves the problems, such as that the design process of urea liquid preparation system is cumbersome, can achieve the quick design that irrelevant specialized engineering personnel carry out denitrogenation urea solution preparing device.

Description

A kind of design method of denitrogenation urea solution preparing device
Technical field
The present invention relates to denitrogenation technical field more particularly to denitrogenation urea solution preparing devices, and in particular to a kind of denitrogenation The design method of urea solution preparing device.
Background technique
Need to use reducing agent, generally liquefied ammonia, ammonium hydroxide and urea in flue-gas denitrification system, it will be also by different methods Former agent sprays into burner hearth or flue.For urea method denitrogenation generally have pyrolysismethod and Hydrolyze method by urea liquid prepare ammonia into Row denitrogenation, two methods require to prepare urea liquid.The design of urea liquid preparation system should include following capital equipment Type selection calculation: (1), bucket elevator (2), urea dissolving tank (3), dissolution jar agitator (4), urea dissolution pump (5) between urea storage, Urea liquid storage tank (6), urea liquid delivery pump (7) (urea liquid circulating pump).
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of design method of denitrogenation urea solution preparing device, It is intended that a kind of design method of denitrogenation urea solution preparing device easily and fast is provided, in this way, solving It is molten to can achieve irrelevant specialized engineering personnel progress denitrogenation urea for the cumbersome problem of the design process of urea liquid preparation system The quick design of liquid preparation facilities.
The present invention provides a kind of design method of denitrogenation urea solution preparing device, the denitrogenation urea solution preparing device Including between urea storage, bucket elevator, urea dissolving tank, dissolution jar agitator, urea dissolution pump, urea liquid storage tank, urea it is molten Liquid delivery pump；
Wherein, the dissolution jar agitator is located inside the urea dissolving tank；It is equipped with discharge port between the urea storage, Outlet between the feeding inlet of the bucket elevator and urea storage connects, and feeding inlet, institute are equipped at the top of the urea dissolving tank The discharge port for stating bucket elevator is connect with the feeding inlet of the urea dissolving tank, and the urea dissolving tank connects water pipe, the urea The entrance of dissolution pump is connect with the discharge port of the urea dissolving tank, and the outlet of the urea dissolution pump and the urea liquid store up The feeding inlet of tank connects, and the discharge port of the urea liquid storage tank is connect with the entrance of the urea liquid delivery pump, the urine The outlet of plain solution transfer pump is connect with hydrolysis system or pyrolysis system；
The design method includes:
Step 1, the liquefied ammonia amount N needed according to a unit denitrogenation1, urea molecule amount φ, amino molecule amount ε, urea purity θ determines the urea amount N of a unit actual purity；
Step 2, according to the storage number of days t between the urea storage1, one unit actual purity urea amount N, urine Plain density p, unit quantity n determine the volume V between the urea storage1, area A between urea storage1；
Step 3, according to the urea amount N of one unit actual purity, the unit quantity n, the bucket elevator is determined Conveying capacity T；
Step 4, according to the urea amount N of one unit actual purity, the unit quantity n, be made into urea liquid Mass concentration ρ1, urea solution density ρ2, the urea dissolving tank quantity n1, the supply time t of the urea dissolving tank2, institute State the bulk coefficient Ψ of urea dissolving tank1, determine the urea liquid amount Q that a unit needs1, the urea that needs of all units it is molten Liquid total amount Q2, the urea dissolving tank volume V3；
Step 5, pump operation duration t is dissolved according to the ureaj, the urea dissolving tank volume V3, determine that urea dissolves The flow Q of pumpj；
Step 6, according to the power P of the dissolution jar agitator unit volume1, the urea dissolving tank volume V3, determine The power P of the dissolution jar agitator；
Step 7, the urea liquid amount Q needed according to one unit1, the unit quantity n, urea liquid storage The number of units n of tank2, the urea liquid storage tank storage number of days t3, the urea solution density ρ2, urea liquid storage tank volume Coefficient Ψ2, determine the volume V of the urea liquid storage tank5；
Step 8, the urea liquid total amount Q needed according to all units2, circulating ratio m, determine urea liquid conveying The flow Q of pumpx。
As a further improvement of the present invention, the step 1 specifically includes:
Step 1a, the liquefied ammonia amount N needed according to one unit denitrogenation1, the urea molecule amount φ, the amino molecule ε is measured, determines the theoretical urea amount N that a unit needs2:
N2=N1×φ/ε；
Step 1b, the theoretical urea amount N needed according to one unit2, the urea purity θ, determine a unit The urea amount N of actual purity:
N=N2/θ。
As a further improvement of the present invention, the step 2 specifically includes:
Step 2a, according between the urea amount N of one unit actual purity, the unit quantity n, the urea storage Storage number of days t1, determine the memory capacity M between the urea storage:
M=N × t1×n；
Step 2b, according to the memory capacity M between urea storage, the urea density p, between determining that the urea stores Spatial volume V1:
V1=M/ ρ；
Step 2c, according to the spatial volume V between urea storage1, determine the area A between urea storage1:
A1=V1/H1
Wherein, H1For piling height.
As a further improvement of the present invention, the step 3 specifically includes:
Step 3a according to the urea amount N of one unit actual purity, the unit quantity n, determines the bucket elevator Conveying capacity calculated value T ':
T '=N × n；
Step 3b takes rounding value to the calculated value T ' of the conveying capacity of the bucket elevator, determines the conveying of the bucket elevator Ability T, the conveying capacity T of the bucket elevator are the rounding value of the calculated value T ' of the conveying capacity of the bucket elevator.
As a further improvement of the present invention, the step 4 specifically includes:
Step 4a according to the urea amount N of one unit actual purity, is made into the mass concentration ρ of urea liquid1, really The water W that a fixed unit needs1:
W1=N × (1- ρ1)/ρ1；
Step 4b, the water W needed according to one unit1, unit actual purity urea amount N, determine institute State the urea liquid amount Q of unit needs1:
Q1=N+W1；
Step 4c, the urea liquid amount Q needed according to one unit1, the unit quantity n, the urea liquid Density p2, determine the urea liquid total amount Q that all units need2:
Q2=Q1×n/ρ2；
Step 4d, the water W needed according to one unit1, the urea dissolving tank quantity n1, the unit number N is measured, determines urea dissolving tank entrance water requirement W2:
W2=W1×n1×n；
Step 4e, the urea liquid total amount Q needed according to the unit2, the urea dissolving tank supply time t2, really Determine the dischargeable capacity V of urea dissolving tank2:
V2=Q2×t2；
Step 4f, according to the dischargeable capacity V of the urea dissolving tank2, the urea dissolving tank bulk coefficient Ψ1, determine The volume calculations value V ' of urea dissolving tank3:
V′3=V2/Ψ1；
Step 4g, to the volume calculations value V ' of the urea dissolving tank3Rounding value is taken, determines the volume V of urea dissolving tank3, The volume V of the urea dissolving tank3For the volume calculations value V ' of the urea dissolving tank3Rounding value.
As a further improvement of the present invention, the step 5 is the operation duration t pumped according to urea dissolutionj, institute State the volume V of urea dissolving tank3, calculate the flow Q of urea dissolution pumpj:
Qj=V3/tj。
As a further improvement of the present invention, the step 6 is, according to the power of the dissolution jar agitator unit volume P1, the urea dissolving tank volume V3, determine that urea dissolving tank is equipped with the power P of agitator:
P=P1×V3。
As a further improvement of the present invention, the step 7 specifically includes:
Step 7a, the urea liquid amount Q needed according to one unit1, the unit quantity n, the urea liquid The storage number of days t of storage tank3, the urea solution density ρ2, determine urea liquid total measurement (volume) amount Q3:
Q3=Q1×n×t3/ρ2
Step 7b, according to the urea liquid total measurement (volume) amount Q3, the urea liquid storage tank number of units n2, determine each urine The volume V of plain solution reservoir4:
V4=Q3/n2；
Step 7c, according to the volume V of each urea liquid storage tank4, urea liquid storage tank bulk coefficient Ψ2, determine The volume calculations value V ' of urea liquid storage tank5:
V5=V4/Ψ2；
Step 7d, to the volume calculations value V ' of urea liquid storage tank5Rounding value is taken, the volume V of urea liquid storage tank is obtained5, The volume V of the urea liquid storage tank5For the volume calculations value V ' of the urea liquid storage tank5Rounding value.
As a further improvement of the present invention, the step 8 specifically includes:
Step 8a, the urea liquid total amount Q needed according to the unit2, circulating ratio m, determine that the urea liquid is defeated Send the flow rate calculation value Q ' of pumpx:
Q′x=Q2×m；
Step 8b, to the flow rate calculation value Q ' of the urea liquid delivery pumpxRounding value is taken, it is defeated to obtain the urea liquid Send the flow Q of pumpx, the flow Q of the urea liquid delivery pumpxFor the flow rate calculation value Q ' of the urea liquid delivery pumpxCircle Whole value.
As a further improvement of the present invention, the unit includes SCR denitrification reactor, the liquid that a unit denitrogenation needs Ammonia amount is the liquefied ammonia amount that a SCR denitrification reactor needs.
It is convenient that the invention has the following beneficial effects: design methods, reliably, solves the design of urea liquid preparation system The cumbersome problem of process can achieve the quick design that irrelevant specialized engineering personnel carry out denitrogenation urea solution preparing device.
Detailed description of the invention
Fig. 1 is first embodiment of the invention, the denitrogenation urea solution preparing device composition schematic diagram in second embodiment.
In figure, between 1, urea storage；2, bucket elevator；3, urea dissolving tank；4, jar agitator is dissolved；5, urea dissolution pump； 6, urea liquid storage tank；7, urea liquid delivery pump；8, hydrolysis system or pyrolysis system.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described in further detail the present invention.
Embodiment 1, a kind of design method of denitrogenation urea solution preparing device, as shown in Figure 1, prepared by denitrogenation urea liquid Device includes 1, bucket elevator 2, urea dissolving tank 3, dissolution jar agitator 4, urea dissolution pump 5, urea liquid storage between urea storage Tank 6, urea liquid delivery pump 7；
Wherein, the dissolution jar agitator 4 is located inside the urea dissolving tank 3；1 is equipped between the urea storage Mouthful, 1 outlet connects between the feeding inlet of the bucket elevator 2 and urea storage, and pan feeding is equipped at the top of the urea dissolving tank 3 Mouthful, the discharge port of the bucket elevator 2 is connect with the feeding inlet of the urea dissolving tank 3, and the urea dissolving tank 3 connects water pipe, The entrance of the urea dissolution pump 5 is connect with the discharge port of the urea dissolving tank 3, the outlet of the urea dissolution pump 5 and institute State the feeding inlet connection of urea liquid storage tank 6, the discharge port of the urea liquid storage tank 6 and the urea liquid delivery pump 7 Entrance connection, the outlet of the urea liquid delivery pump 7 is connect with hydrolysis system or pyrolysis system 8；
The operational process of denitrogenation urea solution preparing device includes:
The feeding inlet that urea granules are increased to urea dissolving tank 3 between urea storage 1 by bucket elevator 2；
Urea dissolving tank 3 is passed through water, dissolved urea particle；
Dissolution jar agitator 4 is stirred the mixture in urea dissolving tank 3, is uniformly dissolved urea granules；
It is dissolved into certain density urea liquid and the storage of urea liquid storage tank 6 is transported to by urea dissolution pump 5；
Solution in urea liquid storage tank 6 is transported to hydrolysis system with urea liquid delivery pump 7 or pyrolysis system 8 converts At ammonia.
Hydrolysis system or pyrolysis system 8 are connect with unit, provide ammonia for unit.
Unit includes SCR denitrification reactor, and the liquefied ammonia amount that a unit denitrogenation needs is that a SCR denitrification reactor needs Liquefied ammonia amount.
The design method of denitrogenation urea solution preparing device includes:
Step 1, the liquefied ammonia amount N needed according to a unit denitrogenation1, urea molecule amount φ, amino molecule amount ε, urea purity θ determines the urea amount N of a unit actual purity, specifically includes:
Step 1a, the liquefied ammonia amount N needed according to a unit denitrogenation1, urea molecule amount φ, amino molecule amount ε, determine one The theoretical urea amount N that unit needs2:
N2=N1×φ/ε
Wherein, N1For the input value of designer, the present embodiment value 110.00Kg/h, urea molecule amount φ are 60, ammonia Molecular weight ε is 34, therefore,
N2=N1× φ/ε=110 × 60/34=194.12 (Kg/h)；
Step 1b, the theoretical urea amount N needed according to a unit2, urea purity θ, determine a unit actual purity Urea amount N:
N=N2/θ
Wherein, θ 99%, therefore,
N=N2/ θ=194.12/99%=196.08 (Kg/h)；
Step 2, according between urea storage 1 storage number of days t1, the urea amount N of unit actual purity, urea density ρ, unit quantity n determine between urea storage 1 volume V1, urea storage between 1 area A1, it specifically includes:
Step 2a, according between the urea amount N of a unit actual purity, unit quantity n, urea storage 1 storage number of days t1, determine between urea storage 1 memory capacity M:
M=N × t1×n
Wherein, wherein n be designer input value, the present embodiment value 2, t1For the input value of designer, sheet Embodiment value 3 days, therefore,
M=N × t1× n=196.08 × 3 × 24 × 2/1000=28.24 (t)
Day is converted into hour in formula, is converted into ton for kilogram；
Step 2b, 1 memory capacity M, urea density p between being stored according to urea determine between urea storage 1 spatial volume V1:
V1=M/ ρ
Wherein, ρ 1.335t/m3,
V1=M/ ρ=28.24/1.335=21.15 (m3)；
Step 2c, 1 spatial volume V between being stored according to urea1, determine between urea storage 1 area A1:
A1=V1/H1
Wherein, H1For piling height, value 2m,
A1=V1/H1=21.15/2=10.58 (m2)；
Step 3, according to the urea amount N of a unit actual purity, unit quantity n, the conveying capacity T of bucket elevator 2 is determined, It specifically includes:
Step 3a, according to the urea amount N of a unit actual purity, unit quantity n, the conveying capacity for determining bucket elevator 2 Calculated value T ':
T '=N × n=196.08 × 2 × 24/1000=9.41 (t/h)；
Step 3b takes rounding value to the calculated value T ' of the conveying capacity of bucket elevator 2, determines the conveying capacity T of bucket elevator 2, The conveying capacity T of bucket elevator 2 is the rounding value of the calculated value T ' of the conveying capacity of bucket elevator 2,
T=10 (t/h)；
Step 4, according to the urea amount N of a unit actual purity, unit quantity n, the mass concentration for being made into urea liquid ρ1, urea solution density ρ2, urea dissolving tank 3 quantity n1, the supply time t of urea dissolving tank 32, urea dissolving tank 3 appearance Product coefficient Ψ1, determine the urea liquid amount Q that a unit needs1, the urea liquid total amount Q that needs of all units2, urea dissolution The volume V of tank 33, it specifically includes:
Step 4a according to the urea amount N of a unit actual purity, is made into the mass concentration ρ of urea liquid1, determine one The water W that a unit needs1:
W1=N × (1- ρ1)/ρ1；
Wherein, ρ1For the input value of designer, southern area should be 55%, and northern area should be 50%, the present embodiment Value 50%,
W1=N × (1- ρ1)/ρ1=196.08 × (100%-50%)/50%=196.08 (Kg/h)
Step 4b, the water W needed according to a unit1, unit actual purity urea amount N, determine a machine The urea liquid amount Q that group needs1:
Q1=N+W1=196.08+196.08=392.16 (Kg/h)；
Step 4c, the urea liquid amount Q needed according to a unit1, unit quantity n, urea solution density ρ2, determine institute The urea liquid total amount Q for thering is unit to need2:
Q2=Q1×n/ρ2
Wherein, in the present embodiment, the mass concentration of urea liquid is 50%, under the conditions of 40 DEG C, ρ2For 1.13t/m3, because This,
Q2=Q1×n/ρ2=392.16 × 2/1.13 × 1000=0.694 (m3/h)；
Step 4d, the water W needed according to a unit1, urea dissolving tank 3 quantity n1, unit quantity n, determine urea 3 entrance water requirement W of dissolving tank2:
W2=W1×n1× n=196.08 × 1 × 2=392.16 (Kg/h)；
Step 4e, the urea liquid total amount Q needed according to unit2, urea dissolving tank 3 supply time t2, determine that urea is molten Solve the dischargeable capacity V of tank 32:
V2=Q2×t2
Wherein, t2For the input value of designer, the present embodiment value for 24 hours, therefore,
V2=Q2×t2=0.694 × 24=16.56 (m3)；
Step 4f, according to the dischargeable capacity V of urea dissolving tank 32, urea dissolving tank 3 bulk coefficient Ψ1, determine that urea is molten Solve the volume calculations value V ' of tank 33:
V′3=V2/Ψ1
Wherein, Ψ1It is 0.85, therefore,
V3'=V2/Ψ1=16.56/0.85=19.48 (m3)；
Step 4g, to the volume calculations value V ' of urea dissolving tank 33Rounding value is taken, determines the volume V of urea dissolving tank 33, urine The volume V of plain dissolving tank 33For the volume calculations value V of urea dissolving tank 33Rounding value,
V3=20 (m3)；
Step 5, according to the operation duration t of urea dissolution pump 5j, urea dissolving tank 3 volume V3, determine urea dissolution pump 5 Flow Qj,
Qj=V3/tj
Wherein, tjFor designer's input value, the present embodiment value 1h, therefore,
Qj=V3/tj=20 (m3/h)。
Step 6, according to the power P of dissolution 4 unit volume of jar agitator1, urea dissolving tank 3 volume V3, determine that urea is molten Solve the power P that tank 3 is equipped with agitator:
P=P1×V3
Wherein, the power per unit of volume P for the dissolving tank jacking stirrer 4 that urea dissolving tank 3 is equipped with1Generally 20~25 (W/m3), the present embodiment P1For 20W/m3, therefore,
P=P1×V3=20 × 20/1000=0.4 (KW)
By the unit of calculated result by watt being converted into kilowatt in formula；
Step 7, the urea liquid amount Q needed according to a unit1, unit quantity n, urea liquid storage tank 6 number of units n2、 The storage number of days t of urea liquid storage tank 63, urea solution density ρ2, urea liquid storage tank 6 bulk coefficient Ψ2, determine that urea is molten The volume V of liquid storage tank 65, it specifically includes:
Step 7a, the urea liquid amount Q needed according to a unit1, unit quantity n, urea liquid storage tank 6 storage day Number t3, urea solution density ρ2, determine urea liquid total measurement (volume) amount Q3:
Q3=Q1×n×t3/ρ2
Wherein, n1、t3For the input value of designer, the present embodiment n1Value 2, t3Value 7 days, therefore,
Q3=Q1×n×t3/ρ2=392.16 × 2 × 7 × 24/1.13 × 1000=116.81 (m3)；
Step 7b, according to urea liquid total measurement (volume) amount Q3, urea liquid storage tank 6 number of units n2, determine each urea liquid storage The volume V of tank 64:
V4=Q3/n2=116.81/2=58.41 (m3)；
Step 7c, according to the volume V of each urea liquid storage tank 64, urea liquid storage tank 6 bulk coefficient Ψ2, determine urine The volume calculations value V ' of plain solution reservoir 65:
V′5=V4/Ψ2；
Wherein, Ψ2It is 0.85, therefore,
V′5=V4/Ψ2=58.41/0.85=68.71 (m3)；
Step 7d, to the volume calculations value V ' of urea liquid storage tank 65Rounding value is taken, the volume of urea liquid storage tank 6 is obtained V5, the volume V of urea liquid storage tank 65For the volume calculations value V ' of urea liquid storage tank 65Rounding value,
V5=70 (m3)；
Step 8, the urea liquid total amount Q needed according to all units2, circulating ratio m, determine urea liquid delivery pump 7 Flow Qx, it is specific as follows:
Step 8a, the urea liquid total amount Q needed according to unit2, circulating ratio m, determine the stream of urea liquid delivery pump 7 Measure calculated value Q 'x:
Q′x=Q2×m
Wherein, m is the input value of designer, generally avoids crystallizing, and 3~5 times of circulation solutions return to urea liquid storage Tank 6, the present embodiment value 5, therefore,
Q′x=Q2× m=0.694 × 5=3.47 (m3/h)；
Step 8b, to the flow rate calculation value Q ' of urea liquid delivery pump 7xRounding value is taken, urea liquid delivery pump 7 is obtained Flow Qx, the flow Q of urea liquid delivery pump 7xFor the flow rate calculation value Q ' of urea liquid delivery pump 7xRounding value,
Qx=4 (m3/h)。
Embodiment 2, a kind of design method of denitrogenation urea solution preparing device, comprising:
Step 1, the liquefied ammonia amount N needed according to a unit denitrogenation1, urea molecule amount φ, amino molecule amount ε, urea purity θ determines the urea amount N of a unit actual purity, specifically includes:
Step 1a, the liquefied ammonia amount N needed according to a unit denitrogenation1, urea molecule amount φ, amino molecule amount ε, determine one The theoretical urea amount N that unit needs2:
N2=N1×φ/ε
Wherein, N1For the input value of designer, the present embodiment value 110.00Kg/h, urea molecule amount φ are 60, ammonia Molecular weight ε is 34, therefore,
N2=N1× φ/ε=110 × 60/34=194.12 (Kg/h)；
Step 1b, the theoretical urea amount N needed according to a unit2, urea purity θ, determine a unit actual purity Urea amount N:
N=N2/θ
Wherein, θ 99%, therefore,
N=N2/ θ=194.12/99%=196.08 (Kg/h)；
Step 2, according between urea storage 1 storage number of days t1, the urea amount N of unit actual purity, urea density ρ, unit quantity n determine between urea storage 1 volume V1, urea storage between 1 area A1, it specifically includes:
Step 2a, according between the urea amount N of a unit actual purity, unit quantity n, urea storage 1 storage number of days t1, determine between urea storage 1 memory capacity M:
M=N × t1×n
Wherein, wherein n be designer input value, the present embodiment value 2, t1For the input value of designer, sheet Embodiment value 3 days, therefore,
M=N × t1× n=196.08 × 3 × 24 × 2/1000=28.24 (t)
Day is converted into hour in formula, is converted into ton for kilogram；
Step 2b, 1 memory capacity M, urea density p between being stored according to urea determine between urea storage 1 spatial volume V1:
V1=M/ ρ
Wherein, ρ 1.335t/m3,
V1=M/ ρ=28.24/1.335=21.15 (m3)；
Step 2c, 1 spatial volume V between being stored according to urea1, determine between urea storage 1 area A1:
A1=V1/H1
Wherein, H1For piling height, value 2m,
A1=V1/H1=21.15/2=10.58 (m2)；
Step 3, according to the urea amount N of a unit actual purity, unit quantity n, the conveying capacity T of bucket elevator 2 is determined, It specifically includes:
Step 3a, according to the urea amount N of a unit actual purity, unit quantity n, the conveying capacity for determining bucket elevator 2 Calculated value T ':
T '=N × n=196.08 × 2 × 24/1000=9.41 (t/h)；
Step 3b takes rounding value to the calculated value T ' of the conveying capacity of bucket elevator 2, determines the conveying capacity T of bucket elevator 2, The conveying capacity T of bucket elevator 2 is the rounding value of the calculated value T ' of the conveying capacity of bucket elevator 2,
T=10 (t/h)；
Step 4, according to the urea amount N of a unit actual purity, unit quantity n, the mass concentration for being made into urea liquid ρ1, urea solution density ρ2, urea dissolving tank 3 quantity n1, the supply time t of urea dissolving tank 32, urea dissolving tank 3 appearance Product coefficient Ψ1, determine the urea liquid amount Q that a unit needs1, the urea liquid total amount Q that needs of all units2, urea dissolution The volume V of tank 33, it specifically includes:
Step 4a according to the urea amount N of a unit actual purity, is made into the mass concentration ρ of urea liquid1, determine one The water W that a unit needs1:
W1=N × (1- ρ1)/ρ1；
Wherein, ρ1For the input value of designer, southern area should be 55%, and northern area should be 50%, the present embodiment Value 55%,
W1=N × (1- ρ1)/ρ1=196.08 × (100%-55%)/55%=160.43 (Kg/h)
Step 4b, the water W needed according to a unit1, unit actual purity urea amount N, determine a machine The urea liquid amount Q that group needs1,
Q1=N+W1=196.08+160.43=356.51 (Kg/h)；
Step 4c, the urea liquid amount Q needed according to a unit1, unit quantity n, urea solution density ρ2, determine institute The urea liquid total amount Q for thering is unit to need2:
Q2=Q1×n/ρ2
Wherein, in the present embodiment, the mass concentration of urea liquid is 55%, under the conditions of 40 DEG C, ρ2For 1.141t/m3, because This,
Q2=Q1×n/ρ2=356.51 × 2/1.141 × 1000=0.625 (m3/h)；
Step 4d, the water W needed according to a unit1, urea dissolving tank 3 quantity n1, unit quantity n, determine urea 3 entrance water requirement W of dissolving tank2:
W2=W1×n1× n=160.43 × 1 × 2=320.86 (Kg/h)；
Step 4e, the urea liquid total amount Q needed according to unit2, urea dissolving tank 3 supply time t2, determine that urea is molten Solve the dischargeable capacity V of tank 32:
V2=Q2×t2
Wherein, t2For the input value of designer, the present embodiment value for 24 hours, therefore,
V2=Q2×t2=0.625 × 24=15 (m3)；
Step 4f, according to the dischargeable capacity V of urea dissolving tank 32, urea dissolving tank 3 bulk coefficient Ψ1, determine that urea is molten Solve the volume calculations value V ' of tank 33:
V′3=V2/Ψ1
Wherein, Ψ1It is 0.85, therefore,
V′3=V2/Ψ1=15/0.85=17.65 (m3)；
Step 4g, to the volume calculations value V ' of urea dissolving tank 33Rounding value is taken, determines the volume V of urea dissolving tank 33, urine The volume V of plain dissolving tank 33For the volume calculations value V ' of urea dissolving tank 33Rounding value,
V3=18 (m3)；
Step 5, according to the operation duration t of urea dissolution pump 5j, urea dissolving tank 3 volume V3, determine urea dissolution pump 5 Flow Qj,
Qj=V3/tj
Wherein, tjFor designer's input value, the present embodiment value 1h, therefore,
Qj=V3/tj=18 (m3/h)。
Step 6, according to the power P of dissolution 4 unit volume of jar agitator1, urea dissolving tank 3 volume V3, determine that urea is molten Solve the power P that tank 3 is equipped with agitator:
P=P1×V3
Wherein, the power per unit of volume P for the dissolving tank jacking stirrer 4 that urea dissolving tank 3 is equipped with1Generally 20~25 (W/m3), the present embodiment P1For 20W/m3, therefore,
P=P1×V3=20 × 18/1000=0.36 (KW)
By the unit of calculated result by watt being converted into kilowatt in formula；
Step 7, the urea liquid amount Q needed according to a unit1, unit quantity n, urea liquid storage tank 6 number of units n2、 The storage number of days t of urea liquid storage tank 63, urea solution density ρ2, urea liquid storage tank 6 bulk coefficient Ψ2, determine that urea is molten The volume V of liquid storage tank 65, it specifically includes:
Step 7a, the urea liquid amount Q needed according to a unit1, unit quantity n, urea liquid storage tank 6 storage day Number t3, urea solution density ρ2, determine urea liquid total measurement (volume) amount Q3:
Q3=Q1×n×t3/ρ2
Wherein, t3For the input value of designer, t3Value 7 days, therefore,
Q3=Q1×n×t3/ρ2=356.51 × 2 × 7 × 24/1.141 × 1000=105 (m3)；
Step 7b, according to urea liquid total measurement (volume) amount Q3, urea liquid storage tank 6 number of units n2, determine each urea liquid storage The volume V of tank 64:
V4=Q3/n2=105/2=52.5 (m3)；
Step 7c, according to the volume V of each urea liquid storage tank 64, urea liquid storage tank 6 bulk coefficient Ψ2, determine urine The volume calculations value V ' of plain solution reservoir 65:
V′5=V4/Ψ2；
Wherein, Ψ2It is 0.85, therefore,
V′5=V4/Ψ2=52.5/0.85=61.76 (m3)；
Step 7d, to the volume calculations value V ' of urea liquid storage tank 65Rounding value is taken, the volume of urea liquid storage tank 6 is obtained V5, the volume V of urea liquid storage tank 65For the volume calculations value V ' of urea liquid storage tank 65Rounding value,
V5=65 (m3)；
Step 8, the urea liquid total amount Q needed according to all units2, circulating ratio m, determine urea liquid delivery pump 7 Flow Qx, it is specific as follows:
Step 8a, the urea liquid total amount Q needed according to unit2, circulating ratio m, determine the stream of urea liquid delivery pump 7 Measure calculated value Q 'x:
Q′x=Q2×m
Wherein, m is the input value of designer, generally avoids crystallizing, and 3~5 times of circulation solutions return to urea liquid storage Tank 6, the present embodiment value 5, therefore,
Q′x=Q2× m=0.625 × 5=3.125 (m3/h)；
Step 8b, to the flow rate calculation value Q ' of urea liquid delivery pump 7xRounding value is taken, urea liquid delivery pump 7 is obtained Flow Qx, the flow Q of urea liquid delivery pump 7xFor the flow rate calculation value Q ' of urea liquid delivery pump 7xRounding value,
Qx=4 (m3/h)。
It is simple the invention has the following beneficial effects: calculating, accurately, the easily designed computer of design method according to the present invention Program can be realized the automation of required lectotype selection, solve the problems, such as that the design process of urea liquid preparation system is cumbersome, It can achieve the quick design that irrelevant specialized engineering personnel carry out denitrogenation urea solution preparing device.
Those skilled in the art is not under conditions of departing from the spirit and scope of the present invention that claims determine, also Various modifications can be carried out to the above content.Therefore the scope of the present invention is not limited in above explanation, but by The range of claims determines.

Claims (10)

1. a kind of design method of denitrogenation urea solution preparing device, the denitrogenation urea solution preparing device includes urea storage Between (1), bucket elevator (2), urea dissolving tank (3), dissolution jar agitator (4), urea dissolution pump (5), urea liquid storage tank (6), Urea liquid delivery pump (7)；
Wherein, it is internal to be located at the urea dissolving tank (3) for the dissolution jar agitator (4)；(1) is equipped between the urea storage Mouthful, the outlet of (1) connects between the feeding inlet of the bucket elevator (2) and urea storage, sets at the top of the urea dissolving tank (3) There is feeding inlet, the discharge port of the bucket elevator (2) is connect with the feeding inlet of the urea dissolving tank (3), the urea dissolving tank (3) water pipe is connected, the entrance of the urea dissolution pump (5) is connect with the discharge port of the urea dissolving tank (3), and the urea is molten Solution pump (5) outlet connect with the feeding inlet of the urea liquid storage tank (6), the discharge port of the urea liquid storage tank (6) and The entrance of the urea liquid delivery pump (7) connects, and the outlet of the urea liquid delivery pump (7) and hydrolysis system or pyrolysis are System (8) connection；
It is characterized in that, the design method includes:
Step 1, the liquefied ammonia amount N needed according to a unit denitrogenation1, urea molecule amount φ, amino molecule amount ε, urea purity θ, determine The urea amount N of one unit actual purity；
Step 2, according to the storage number of days t of (1) between the urea storage1, one unit actual purity urea amount N, urea Density p, unit quantity n determine the volume V of (1) between the urea storage1, between urea storage (1) area A1；
Step 3, according to the urea amount N of one unit actual purity, the unit quantity n, the bucket elevator (2) is determined Conveying capacity T；
Step 4, according to the urea amount N of one unit actual purity, the unit quantity n, the quality for being made into urea liquid Concentration ρ1, urea solution density ρ2, the urea dissolving tank (3) quantity n1, the supply time t of the urea dissolving tank (3)2、 The bulk coefficient Ψ of the urea dissolving tank (3)1, determine the urea liquid amount Q that a unit needs1, the urine that needs of all units Plain solution total amount Q2, the urea dissolving tank (3) volume V3；
Step 5, pump (5) operation duration t is dissolved according to the ureaj, the urea dissolving tank (3) volume V3, determine that urea is molten The flow Q of solution pump (5)j；
Step 6, according to the power P of described dissolution jar agitator (4) unit volume1, the urea dissolving tank (3) volume V3, really The power P of fixed dissolution jar agitator (4)；
Step 7, the urea liquid amount Q needed according to one unit1, the unit quantity n, the urea liquid storage tank (6) Number of units n2, the urea liquid storage tank (6) storage number of days t3, the urea solution density ρ2, urea liquid storage tank (6) Bulk coefficient Ψ2, determine the volume V of the urea liquid storage tank (6)5；
Step 8, the urea liquid total amount Q needed according to all units2, circulating ratio m, determine the urea liquid delivery pump (7) Flow Qx。
2. design method according to claim 1, which is characterized in that the step 1 specifically includes:
Step 1a, the liquefied ammonia amount N needed according to one unit denitrogenation1, the urea molecule amount φ, the amino molecule amount ε, Determine the theoretical urea amount N that a unit needs2:
N2=N1×φ/ε；
Step 1b, the theoretical urea amount N needed according to one unit2, the urea purity θ, determine that a unit is actually pure The urea amount N of degree:
N=N2/θ。
3. design method according to claim 1, which is characterized in that the step 2 specifically includes:
Step 2a, according between the urea amount N of one unit actual purity, the unit quantity n, the urea storage (1) Storage number of days t1, determine the memory capacity M of (1) between the urea storage:
M=N × t1×n；
Step 2b, according to the memory capacity M of (1), the urea density p between urea storage, between determining that the urea stores (1) spatial volume V1:
V1=M/ ρ；
Step 2c, according to the spatial volume V of (1) between urea storage1, determine the area A of (1) between urea storage1:
A1=V1/H1
Wherein, H1For piling height.
4. design method according to claim 1, which is characterized in that the step 3 specifically includes:
Step 3a according to the urea amount N of one unit actual purity, the unit quantity n, determines the bucket elevator (2) Conveying capacity calculated value T ':
T '=N × n；
Step 3b takes rounding value to the calculated value T ' of the conveying capacity of the bucket elevator (2), determines the defeated of the bucket elevator (2) Sending ability T, the conveying capacity T of the bucket elevator (2) is the rounding value of the calculated value T ' of the conveying capacity of the bucket elevator (2).
5. design method according to claim 1, which is characterized in that the step 4 specifically includes:
Step 4a according to the urea amount N of one unit actual purity, is made into the mass concentration ρ of urea liquid1, determine one The water W that unit needs1:
W1=N × (1- ρ1)/ρ1；
Step 4b, the water W needed according to one unit1, unit actual purity urea amount N, determine one The urea liquid amount Q that unit needs1:
Q1=N+W1；
Step 4c, the urea liquid amount Q needed according to one unit1, the unit quantity n, the urea solution density ρ2, determine the urea liquid total amount Q that all units need2:
Q2=Q1×n/ρ2；
Step 4d, the water W needed according to one unit1, the urea dissolving tank (3) quantity n1, the unit quantity N determines urea dissolving tank (3) entrance water requirement W2:
W2=W1×n1×n；
Step 4e, the urea liquid total amount Q needed according to the unit2, the urea dissolving tank (3) supply time t2, determine The dischargeable capacity V of urea dissolving tank (3)2:
V2=Q2×t2；
Step 4f, according to the dischargeable capacity V of the urea dissolving tank (3)2, the urea dissolving tank (3) bulk coefficient Ψ1, really Determine the volume calculations value V of urea dissolving tank (3)3':
V3'=V2/Ψ1；
Step 4g, to the volume calculations value V ' of the urea dissolving tank (3)3Rounding value is taken, determines the volume of urea dissolving tank (3) V3, the volume V of the urea dissolving tank (3)3For the volume calculations value V ' of the urea dissolving tank (3)3Rounding value.
6. design method according to claim 1, which is characterized in that the step 5 is to be dissolved and pumped according to the urea (5) operation duration tj, the urea dissolving tank (3) volume V3, calculate the flow Q of urea dissolution pump (5)j:
Qj=V3/tj。
7. design method according to claim 1, which is characterized in that the step 6 is, according to the dissolution jar agitator (4) power P of unit volume1, the urea dissolving tank (3) volume V3, determine that urea dissolving tank (3) are equipped with the function of agitator Rate P:
P=P1×V3。
8. design method according to claim 1, which is characterized in that the step 7 specifically includes:
Step 7a, the urea liquid amount Q needed according to one unit1, the unit quantity n, the urea liquid storage tank (6) storage number of days t3, the urea solution density ρ2, determine urea liquid total measurement (volume) amount Q3:
Q3=Q1×n×t3/ρ2
Step 7b, according to the urea liquid total measurement (volume) amount Q3, the urea liquid storage tank (6) number of units n2, determine each urea The volume V of solution reservoir (6)4:
V4=Q3/n2；
Step 7c, according to the volume V of each urea liquid storage tank (6)4, urea liquid storage tank (6) bulk coefficient Ψ2, really Determine the volume calculations value V ' of urea liquid storage tank (6)5:
V5=V4/Ψ2；
Step 7d, to the volume calculations value V ' of urea liquid storage tank (6)5Rounding value is taken, the volume of urea liquid storage tank (6) is obtained V5, the volume V of the urea liquid storage tank (6)5For the volume calculations value V ' of the urea liquid storage tank (6)5Rounding value.
9. design method according to claim 1, which is characterized in that the step 8 specifically includes:
Step 8a, the urea liquid total amount Q needed according to the unit2, circulating ratio m, determine the urea liquid delivery pump (7) flow rate calculation value Q 'x:
Q′x=Q2×m；
Step 8b, to the flow rate calculation value Q ' of the urea liquid delivery pump (7)xRounding value is taken, the urea liquid conveying is obtained Pump the flow Q of (7)x, the flow Q of the urea liquid delivery pump (7)xFor the flow rate calculation value of the urea liquid delivery pump (7) Q′xRounding value.
10. design method according to claim 1, which is characterized in that the unit includes SCR denitrification reactor, and one The liquefied ammonia amount that unit denitrogenation needs is the liquefied ammonia amount that a SCR denitrification reactor needs.
CN201710404519.XA 2017-06-01 2017-06-01 A kind of design method of denitrogenation urea solution preparing device Pending CN108970441A (en)

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Application publication date: 20181211