CN117029012B - Treatment system for waste liquid in caprolactam production - Google Patents
Treatment system for waste liquid in caprolactam production Download PDFInfo
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- CN117029012B CN117029012B CN202311010631.7A CN202311010631A CN117029012B CN 117029012 B CN117029012 B CN 117029012B CN 202311010631 A CN202311010631 A CN 202311010631A CN 117029012 B CN117029012 B CN 117029012B
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- 239000002699 waste material Substances 0.000 title claims abstract description 152
- 239000007788 liquid Substances 0.000 title claims abstract description 149
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 44
- 238000004458 analytical method Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 5
- 238000012797 qualification Methods 0.000 claims description 4
- 238000009838 combustion analysis Methods 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 238000007127 saponification reaction Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000004821 distillation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 235000014666 liquid concentrate Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M11/00—Safety arrangements
- F23M11/04—Means for supervising combustion, e.g. windows
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/10—Liquid waste
- F23G2209/101—Waste liquor
Abstract
The invention discloses a treatment system of waste liquid in caprolactam production, which comprises an incineration system; the burning system of the burning system obtains the flame information of the corresponding waste liquid nozzle through the acquisition module, and judges whether the waste liquid sprayed by the nozzle burns fully according to the flame information analysis, so that the problem that the existing burning furnace cannot monitor the burning condition of the waste liquid efficiently, and a large fluctuation error exists, so that the waste liquid treatment is not thorough enough is avoided; according to the unqualified combustion signal of the waste liquid nozzle, analyzing and processing the flow between the waste liquid and the steam, and judging whether the atomization effect of the waste liquid in the incinerator is poor due to unqualified flow allocation between the waste liquid and the steam, so that the problem that the waste liquid cannot be fully combusted is solved; through adjusting the flow ratio of waste liquid to steam, the waste liquid and steam can be better fused, and can be better atomized through the nozzle, so that the waste liquid can be fully combusted in the incinerator, and the waste liquid treatment efficiency in caprolactam production is improved.
Description
Technical Field
The invention relates to the technical field of caprolactam production, in particular to a treatment system for waste liquid in caprolactam production.
Background
Chinese patent CN204079682U discloses a treatment system for waste liquid in caprolactam production. The waste liquid treatment device comprises a basket filter, a mixed saponification lye storage tank and an incineration system, wherein a waste liquid pipe is connected with the basket filter, concentrated liquid at an outlet of the basket filter is connected to the mixed saponification lye storage tank through a pipeline, and then treated waste liquid is directly discharged to the incineration system. Impurities and organic particles in the benzene distillation residual liquid and the waste methanol liquid are filtered and directly enter a mixed saponification lye storage tank and then enter an incineration system;
in the prior art, when waste liquid in caprolactam production is burnt, the problem of insufficient waste liquid combustion possibly exists, so that the waste liquid cannot be effectively treated.
Disclosure of Invention
The invention aims to solve the problems of the background art and provides a treatment system for waste liquid in caprolactam production.
The aim of the invention can be achieved by the following technical scheme:
a treatment system of waste liquid in caprolactam production comprises an incineration system; the incineration system comprises:
the acquisition module acquires the flame intensity of an incineration point in the incinerator and marks the flame intensity as Dh i Wherein i represents the number of incineration points, which is a positive integer;
the analysis module acquires the flame intensity Dh of the acquisition module i And the flame intensity Dh of the acquisition module is acquired i Comparing with a flame intensity threshold of the acquisition module;
if the signal is larger than the preset value, generating a pre-qualified signal of the waste liquid nozzle;
if the waste liquid nozzle combustion failure signal is smaller than the preset value, generating the waste liquid nozzle combustion failure signal;
when the combustion pre-qualification signal is received, a flame intensity set A { Dh is constructed according to the detection time i1 、Dh i2 ...Dh ij -wherein j represents the detection time;
and then pass the formula dhj= (Dh i1 +Dh i2 +...+Dh ij ) And/j, calculating to obtain a flame intensity average value DHJ in the detection time, and calculating a flame intensity average value DHC= |Dh by a formula DHC= |Dh i1 -Dh i2 |+|Dh i2 -Dh i3 |+...+|Dh ij-1 -Dh ij I, obtaining a flame intensity difference DHC in the detection time;
calculating to obtain a first combustion analysis value ZR1 through a formula ZR1=a1+a2+DHC; wherein a1 and a2 are proportionality coefficients;
obtaining the maximum flame intensity DH in the set A ijmax And flame intensity minimum DH ijmin DH is represented by the formula ZR2 = a3 ijmax +a4*DH ijmin Calculating to obtain a combustion second analysis value ZR2; wherein a3 and a4 are proportionality coefficients;
then by the formula xz= (a5+a6+a2) a5+a6 And calculating to obtain the combustion coefficient Xz of the waste liquid nozzle in the detection time, wherein a5 and a6 are proportionality coefficients.
As a further scheme of the invention: the annular array in the incinerator is provided with a plurality of waste liquid nozzles, and flame detectors are correspondingly arranged at the positions of the waste liquid nozzles and are used for detecting the flame intensity of the waste liquid during combustion.
As a further scheme of the invention: the analysis module further includes:
comparing the obtained combustion coefficient Xz of the liquid nozzle with a combustion coefficient threshold value of the waste liquid nozzle;
if the combustion signal is larger than the preset value, generating a combustion qualified signal of the waste liquid nozzle;
if the combustion failure signal is smaller than the predetermined value, the waste liquid nozzle combustion failure signal is generated.
As a further scheme of the invention: further comprises:
the processing module obtains a waste liquid flow value LF in the detection time j And construct set B1{ LF 1 、LF 2 ...LF j Obtaining the flow rate LF of the waste liquid at two adjacent time points j-1 And a waste liquid flow rate value LF j The method comprises the steps of carrying out a first treatment on the surface of the By the formula ZBF j-1 ＝(LF j-1 -LFO) 2 /(LF j -LFO) 2 Calculating to obtain a waste liquid flow rate change value ZBF j-1 ；
The obtained waste liquid flow rate change value ZBF j-1 Construct set B2{ ZBF 1 、ZBF 2 ...ZBF j-1 -a }; wherein LFO is the threshold of waste flow in the detection time;
obtaining the steam flow value LZ in the detection time j And construct the set C1{ LZ } 1 、LZ 2 ...LZ j }；
Obtaining steam flow values LZ of two adjacent time points j-1 And steam flow value LZ j The method comprises the steps of carrying out a first treatment on the surface of the By the formula ZBZ j-1 ＝(LZ -1 -LZO) 2 /(LZ j -LZO) 2 Calculate the steam flow rate change value ZBZ j-1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein LZO is a steam flow threshold in the detection time;
the obtained steam flow rate change value ZBZ j-1 Construct set C2{ ZBZ 1 、ZBZ 2 ...ZBZ j-1 }。
As a further scheme of the invention: according to the same time node, carrying out one-to-one correspondence on subsets in the set B1 and the set C1, substituting subset data into an X-axis with a waste liquid flow change value, constructing a waste liquid-steam flow change curve with a steam flow change value as a factor Y, and deriving the waste liquid-steam flow change curve to obtain a derivative curve;
marking a point with a derivative of 0 in the derivative curve as a standing point; the time difference CT between two adjacent standing points is obtained.
As a further scheme of the invention: comparing the obtained time difference CT with a time difference threshold;
if the ratio of the generated waste liquid to the steam is more than the predetermined value, the ratio of the generated waste liquid to the steam is qualified;
if the signal is smaller than the preset value, a blending signal is generated.
As a further scheme of the invention: further comprises:
the allocation module is used for obtaining a set B2, adding and summing to obtain an average value, and obtaining a waste liquid flow change average value ZBFJ;
acquiring a set C2, adding and summing to obtain an average value, and obtaining a steam flow change average value ZBZJ;
the fitting coefficient Xt is calculated by the formula xt= (b1×zfbj)/(b2×zbzj).
As a further scheme of the invention: acquiring a set B1, adding and summing to obtain an average value, and obtaining an average value LFJ of the flow of the waste liquid; acquiring a set C1, adding and summing to obtain an average value, and obtaining a steam flow average value LZJ;
the waste liquid addition value FB is calculated by the formula fb= LFJ ×xt.
The invention has the beneficial effects that:
the burning system acquires flame information of the corresponding waste liquid nozzle through the acquisition module, and judges whether waste liquid sprayed by the nozzle burns fully according to flame information analysis, so that the problem that the existing burning furnace cannot monitor the burning condition of the waste liquid efficiently, and a large fluctuation error exists, so that the waste liquid treatment is not thorough enough is avoided;
according to the unqualified combustion signal of the waste liquid nozzle, analyzing and processing the flow between the waste liquid and the steam, and judging whether the atomization effect of the waste liquid in the incinerator is poor due to unqualified flow allocation between the waste liquid and the steam, so that the problem that the waste liquid cannot be fully combusted is solved;
through adjusting the flow ratio of waste liquid to steam, the waste liquid and steam can be better fused, and can be better atomized through the nozzle, so that the waste liquid can be fully combusted in the incinerator, and the waste liquid treatment efficiency in caprolactam production is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a system block diagram of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention is a treatment system for waste liquid in caprolactam production,
comprises an incineration system; the incineration system comprises:
the acquisition module acquires the flame intensity of an incineration point in the incinerator and marks the flame intensity as Dh i Wherein i represents the number of incineration points, which is a positive integer; wherein, in order to improve the incineration of waste liquidThe efficiency is that a plurality of waste liquid nozzles are arranged in an annular array in the incinerator, and flame detectors are correspondingly arranged at the positions of the waste liquid nozzles and are used for detecting the flame intensity of the waste liquid during combustion;
the analysis module acquires the flame intensity Dh of the acquisition module i And for flame intensity Dh i Performing analysis treatment;
the specific working process of the analysis module is as follows:
step 1: acquiring flame intensity Dh of acquisition module i And the flame intensity Dh of the acquisition module is acquired i Comparing with a flame intensity threshold of the acquisition module;
if the flame intensity Dh i When the flame intensity is larger than the flame intensity threshold value of the acquisition module, generating a pre-qualification signal of the waste liquid nozzle;
if the flame intensity Dh i When the flame intensity is smaller than the flame intensity threshold value of the acquisition module, generating a waste liquid nozzle combustion disqualification signal;
step 2: when the combustion pre-qualification signal is received, a flame intensity set A { Dh is constructed according to the detection time i1 、Dh i2 ...Dh ij -wherein j represents the detection time;
and then pass the formula dhj= (Dh i1 +Dh i2 +...+Dh ij ) And/j, calculating to obtain a flame intensity average value DHJ in the detection time, and calculating a flame intensity average value DHC= |Dh by a formula DHC= |Dh i1 -Dh i2 |+|Dh i2 -Dh i3 |+...+|Dh ij-1 -Dh ij I, obtaining a flame intensity difference DHC in the detection time;
calculating to obtain a first combustion analysis value ZR1 through a formula ZR1=a1+a2+DHC; wherein, a1 and a2 are proportionality coefficients, a1+a2=1.2, and a1 and a2 are both larger than zero;
obtaining the maximum flame intensity DH in the set A ijmax And flame intensity minimum DH ijmin DH is represented by the formula ZR2 = a3 ijmax +a4*DH ijmin Calculating to obtain a combustion second analysis value ZR2; wherein, a3 and a4 are proportionality coefficients, a3+a4=0.9, and a3 and a4 are both larger than zero;
then pass through a maleFormula xz= (a5×zr1+a6×zr2) a5+a6 Calculating to obtain a combustion coefficient Xz of the waste liquid nozzle in the detection time, wherein a5 and a6 are proportionality coefficients, a5+a6=2, and a5 and a6 are both larger than zero;
step 3: comparing the obtained combustion coefficient Xz of the liquid nozzle with a combustion coefficient threshold value of the waste liquid nozzle;
if the combustion coefficient Xz of the liquid nozzle is larger than the combustion coefficient threshold value of the waste liquid nozzle, generating a combustion qualified signal of the waste liquid nozzle;
if the combustion coefficient Xz of the liquid nozzle is smaller than the combustion coefficient threshold value of the waste liquid nozzle, generating a waste liquid nozzle combustion failure signal;
according to the invention, the acquisition module acquires flame information of the corresponding waste liquid nozzle, and judges whether waste liquid sprayed by the nozzle burns fully according to flame information analysis, so that the problem that the existing incinerator cannot monitor the combustion condition of the waste liquid efficiently, so that a large fluctuation error exists, and waste liquid treatment is not thorough enough is avoided;
the treatment module is used for treating the combustion condition of the waste liquid when receiving the combustion failure signal of the waste liquid nozzle;
the specific working process of the processing module is as follows:
step 1: obtaining the flow rate value LF of the waste liquid in the detection time j And construct set B1{ LF 1 、LF 2 ...LF j Obtaining the flow rate LF of the waste liquid at two adjacent time points j-1 And a waste liquid flow rate value LF j The method comprises the steps of carrying out a first treatment on the surface of the By the formula ZBF j-1 ＝(LF j-1 -LFO) 2 /(LF j -LFO) 2 Calculating to obtain a waste liquid flow rate change value ZBF j-1 ；
The obtained waste liquid flow rate change value ZBF j-1 Construct set B2{ ZBF 1 、ZBF 2 ...ZBF j-1 -a }; wherein LFO is the threshold of waste flow in the detection time;
step 2: obtaining the steam flow value LZ in the detection time j And construct the set C1{ LZ } 1 、LZ 2 ...LZ j }；
Obtaining steam flow at two adjacent time pointsMagnitude LZ j-1 And steam flow value LZ j The method comprises the steps of carrying out a first treatment on the surface of the By the formula ZBZ j-1 ＝(LZ -1 -LZO) 2 /(LZ j -LZO) 2 Calculate the steam flow rate change value ZBZ j-1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein LZO is a steam flow threshold in the detection time;
the obtained steam flow rate change value ZBZ j-1 Construct set C2{ ZBZ 1 、ZBZ 2 ...ZBZ j-1 }；
Step 3: according to the same time node, carrying out one-to-one correspondence on subsets in the set B1 and the set C1, substituting subset data into an X-axis with a waste liquid flow change value, constructing a waste liquid-steam flow change curve with a steam flow change value as a factor Y, and deriving the waste liquid-steam flow change curve to obtain a derivative curve;
marking a point with a derivative of 0 in the derivative curve as a standing point; the time difference CT between two adjacent standing points is obtained;
step 4: comparing the obtained time difference CT with a time difference threshold;
if the time difference CT is larger than the time difference threshold, the proportion of the waste liquid and the steam is qualified;
if the time difference CT is smaller than the time difference threshold, the ratio of the waste liquid to the steam is unqualified, and a blending signal is generated;
the treatment module is used for analyzing and treating the flow between the waste liquid and the steam according to the combustion failure signal of the waste liquid nozzle and judging whether the atomization effect of the waste liquid in the incinerator is poor due to the failure of flow allocation between the waste liquid and the steam, so that the problem that the waste liquid cannot be fully combusted is solved;
the allocation module is used for adjusting the flow ratio of the waste liquid to the steam when the ratio of the waste liquid to the steam is unqualified;
the specific working process of the allocation module is as follows:
step 1: acquiring a set B2, adding and summing to obtain an average value, and obtaining a waste liquid flow change average value ZBFJ;
acquiring a set C2, adding and summing to obtain an average value, and obtaining a steam flow change average value ZBZJ;
calculating to obtain a blending coefficient Xt through a formula Xt= (b 1 x ZFBJ)/(b 2 x ZBZJ);
step 2: acquiring a set B1, adding and summing to obtain an average value, and obtaining an average value LFJ of the flow of the waste liquid; acquiring a set C1, adding and summing to obtain an average value, and obtaining a steam flow average value LZJ;
calculating to obtain a waste liquid supplementing value FB through a formula FB= LFJ;
according to the preparation module, the flow ratio of the waste liquid to the steam is adjusted, so that the waste liquid and the steam can be better fused, and can be better atomized through the nozzle, so that the waste liquid can be fully combusted in the incinerator, and the waste liquid treatment efficiency in caprolactam production is improved.
The working principle of the invention is as follows: benzene distillation residual liquid and methanol waste liquid generated in caprolactam production pass through a basket filter, filtered waste liquid enters a mixed saponification lye storage tank, and treated waste liquid concentrate is directly discharged to an incineration system for final treatment;
the burning system acquires flame information of a corresponding waste liquid nozzle through the acquisition module, and judges whether waste liquid sprayed by the nozzle burns fully according to flame information analysis, so that the problem that the existing burning furnace cannot monitor the burning condition of the waste liquid efficiently, and a large fluctuation error exists, so that waste liquid treatment is not thorough enough is avoided;
according to the unqualified combustion signal of the waste liquid nozzle, analyzing and processing the flow between the waste liquid and the steam, and judging whether the atomization effect of the waste liquid in the incinerator is poor due to unqualified flow allocation between the waste liquid and the steam, so that the problem that the waste liquid cannot be fully combusted is solved;
through adjusting the flow ratio of waste liquid to steam, the waste liquid and steam can be better fused, and can be better atomized through the nozzle, so that the waste liquid can be fully combusted in the incinerator, and the waste liquid treatment efficiency in caprolactam production is improved.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (4)
1. A treatment system of waste liquid in caprolactam production comprises an incineration system; characterized in that the incineration system comprises:
the acquisition module acquires the flame intensity of an incineration point in the incinerator and marks the flame intensity as Dh i Wherein i represents the number of incineration points, which is a positive integer;
the analysis module acquires the flame intensity Dh of the acquisition module i And the flame intensity Dh of the acquisition module is acquired i Comparing with a flame intensity threshold of the acquisition module;
if the signal is larger than the preset value, generating a pre-qualified signal of the waste liquid nozzle;
if the waste liquid nozzle combustion failure signal is smaller than the preset value, generating the waste liquid nozzle combustion failure signal;
when the combustion pre-qualification signal is received, a flame intensity set A { Dh is constructed according to the detection time i1 、Dh i2 ...Dh ij -wherein j represents the detection time;
and then pass the formula dhj= (Dh i1 +Dh i2 +...+Dh ij ) And/j, calculating to obtain a flame intensity average value DHJ in the detection time, and calculating a flame intensity average value DHC= |Dh by a formula DHC= |Dh i1 -Dh i2 |+|Dh i2 -Dh i3 |+...+|Dh ij-1 -Dh ij I, obtaining a flame intensity difference DHC in the detection time;
calculating to obtain a first combustion analysis value ZR1 through a formula ZR1=a1+a2+DHC; wherein, a1 and a2 are proportionality coefficients, a1+a2=1.2, and a1 and a2 are both larger than zero;
obtaining the maximum flame intensity DH in the set A ijmax And flame intensity minimum DH ijmin DH is represented by the formula ZR2 = a3 ijmax +a4*DH ijmin Calculating to obtain a combustion second analysis value ZR2; wherein, a3 and a4 are proportionality coefficients, a3+a4=0.9, and a3 and a4 are both larger than zero;
then by the formula xz= (a5+a6+a2) a5+a6 Calculating to obtain the combustion coefficient Xz of the waste liquid nozzle in the detection time, wherein,a5 and a6 are proportionality coefficients, a5+a6=2, and a5 and a6 are both larger than zero;
the analysis module further includes:
comparing the obtained combustion coefficient Xz of the liquid nozzle with a combustion coefficient threshold value of the waste liquid nozzle;
if the combustion signal is larger than the preset value, generating a combustion qualified signal of the waste liquid nozzle;
if the combustion failure signal is smaller than the predetermined value, the waste liquid nozzle combustion failure signal is generated.
2. The system for treating waste liquid in caprolactam production according to claim 1, wherein a plurality of waste liquid nozzles are arranged in a circular array in the incinerator, and flame detectors are arranged at positions of the waste liquid nozzles correspondingly for detecting flame intensity when the waste liquid burns.
3. The system for treating waste liquid in caprolactam production according to claim 1, further comprising:
the processing module obtains a waste liquid flow value LF in the detection time j And construct set B1{ LF 1 、LF 2 ...LF j Obtaining the flow rate LF of the waste liquid at two adjacent time points j-1 And a waste liquid flow rate value LF j The method comprises the steps of carrying out a first treatment on the surface of the By the formula ZBF j-1 =（LF j-1 -LFO） 2 /（LF j -LFO） 2 Calculating to obtain a waste liquid flow rate change value ZBF j-1 ；
The obtained waste liquid flow rate change value ZBF j-1 Construct set B2{ ZBF 1 、ZBF 2 ...ZBF j-1 -a }; wherein LFO is the threshold of waste flow in the detection time;
obtaining the steam flow value LZ in the detection time j And construct the set C1{ LZ } 1 、LZ 2 ...LZ j }；
Obtaining steam flow values LZ of two adjacent time points j-1 And steam flow value LZ j The method comprises the steps of carrying out a first treatment on the surface of the By the formula ZBZ j-1 =（LZ -1 -LZO） 2 /（LZ j -LZO） 2 Calculate the steam flow rate change value ZBZ j-1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein LZO is a steam flow threshold in the detection time;
the obtained steam flow rate change value ZBZ j-1 Construct set C2{ ZBZ 1 、ZBZ 2 ...ZBZ j-1 }；
According to the same time node, carrying out one-to-one correspondence on subsets in the set B1 and the set C1, substituting subset data into the subset data, taking a waste liquid flow change value as an X axis, taking a steam flow change value as a Y axis, constructing a waste liquid-steam flow change curve, and deriving the waste liquid-steam flow change curve to obtain a derivative curve;
marking a point with a derivative of 0 in the derivative curve as a standing point; the time difference CT between two adjacent standing points is obtained;
comparing the obtained time difference CT with a time difference threshold;
if the ratio of the generated waste liquid to the steam is more than the predetermined value, the ratio of the generated waste liquid to the steam is qualified;
if the signal is smaller than the preset value, a blending signal is generated.
4. A system for treating waste liquid in the production of caprolactam as defined in claim 3, further comprising:
the allocation module is used for obtaining a set B2, adding and summing to obtain an average value, and obtaining a waste liquid flow change average value ZBFJ;
acquiring a set C2, adding and summing to obtain an average value, and obtaining a steam flow change average value ZBZJ;
calculating to obtain a blending coefficient Xt through a formula Xt= (b 1 x ZFBJ)/(b 2 x ZBZJ);
acquiring a set B1, adding and summing to obtain an average value, and obtaining an average value LFJ of the flow of the waste liquid; acquiring a set C1, adding and summing to obtain an average value, and obtaining a steam flow average value LZJ;
the waste liquid addition value FB is calculated by the formula fb= LFJ ×xt.
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