Method for treating VOCs in industrial exhaust gas

Abstract

The application discloses a kind of industrial waste gas VOC processing method, comprising the following steps: obtaining the VOC content value of waste gas import, the VOC content value of adsorption cavity export, the VOC content value of sealing cavity export;First waste value ZF1, second waste value ZF2, third waste value ZF3 of acquisition module are obtained and processed and analyzed, to judge the processing state of VOC in industrial waste gas, whether qualified;When obtaining the unqualified signal of processing module, the processing efficiency of adsorbent or photocatalyst is analyzed, to judge the fault point existing;When obtaining the unqualified signal of adsorption processing and the unqualified signal of photocatalytic processing of fault module, the problem of malfunction is judged, and corresponding processing work is made, the processing method can efficiently and stably process VOC in industrial waste gas, improve its processing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial waste gas, and in particular to a method for treating VOC in industrial waste gas. Background Art

[0002] Chinese patent CN107158945B discloses a purification system and method for removing VOCs from industrial waste gas, comprising an adsorbent placement chamber having a gas inlet and a gas outlet, and an adsorbent disposed within the adsorbent placement chamber; the gas inlet of the adsorbent placement chamber being located at the bottom of the adsorbent placement chamber, and the gas outlet being located at the top of the adsorbent placement chamber; a photocatalyst being coated on the outer wall of the adsorbent placement chamber, and a cover body being disposed over the adsorbent placement chamber; a sealed cavity being formed between the outer wall of the adsorbent placement chamber and the cover body, and an exhaust port being disposed at the bottom end of the cover body;

[0003] In the prior art, during the treatment of VOCs in industrial waste gas, it is impossible to monitor the adsorption material and the photocatalyst in real time to judge the treatment progress, resulting in low treatment efficiency. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned problems of the background technology and to provide a method for treating VOC in industrial waste gas.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for treating VOC in industrial waste gas comprises the following steps:

[0007] Step 1: The waste gas enters the adsorbent placement chamber through the gas inlet, is adsorbed by the adsorbent, and then enters the sealed chamber; the gas entering the sealed chamber is catalyzed by the photocatalyst and then discharged through the exhaust port, thereby obtaining the VOC content value of the waste gas inlet, the VOC content value of the adsorption chamber outlet, and the VOC content value of the sealed chamber outlet, and are marked as the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 respectively;

[0008] Step 2: Obtain the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 from the acquisition module for processing and analysis to determine whether the treatment status of VOC in industrial waste gas is qualified;

[0009] Step 3: When the analysis module receives a processing failure signal, the adsorbent or photocatalyst processing efficiency is analyzed to determine the existing fault point;

[0010] Step 4: When the adsorption treatment failure signal and the photocatalytic treatment failure signal of the fault module are obtained, the fault problem is determined and corresponding processing is performed.

[0011] As a further solution of the present invention: in step 2, the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 are obtained, and the waste gas treatment value ZFC is calculated by the formula ZFC=ZF1-(ZF2+ZF3).

[0012] As a further solution of the present invention: comparing the obtained exhaust gas treatment value ZFC with the exhaust gas treatment threshold value;

[0013] If the exhaust gas treatment value ZFC is greater than the exhaust gas treatment threshold, a treatment failure signal is generated;

[0014] If the exhaust gas treatment value ZFC is less than the exhaust gas treatment threshold, a treatment qualified signal is generated.

[0015] As a further solution of the present invention: in step 3,

[0016] The adsorption treatment value ZXC is calculated by the formula ZXC=ZF1-ZF2;

[0017] Divide the first L1 minutes of the treatment time into detection period i, where L1 is a quantity constant, i = 1, 2, ..., n, where n is a positive integer, and the duration of each detection period is equal; obtain the adsorption treatment value ZXCi in the detection period i, and construct the adsorption treatment set A{ZXC1, ZXC2, ..., ZXCi}, perform mean calculation to obtain the adsorption treatment mean ZXCJ within the treatment time, and perform difference calculation to obtain the adsorption treatment variance ZXCF within the treatment time;

[0018] The adsorption treatment coefficient XX is calculated by the formula XX=a1*ZXCJ-a2*ZXCF; wherein a1 and a2 are both proportional coefficients, a1 is 0.69, and a2 is 0.42;

[0019] Comparing the obtained adsorption treatment coefficient XX with the adsorption treatment coefficient threshold;

[0020] If the adsorption treatment coefficient XX is greater than the adsorption treatment coefficient threshold, an adsorption treatment qualified signal is generated;

[0021] If the adsorption process coefficient XX is less than the adsorption process coefficient threshold, an adsorption process failure signal is generated.

[0022] As a further solution of the present invention: the photocatalytic treatment value ZGC is calculated by the formula ZXC=ZF2-ZF3;

[0023] Divide the first L1 minutes of the treatment time into detection period i, where L1 is a quantity constant, i = 1, 2, ..., n, n is a positive integer, and the duration of each detection period is equal; obtain the photocatalytic treatment value ZGCi in the detection period i, and construct the photocatalytic treatment value B{ZGC1, ZGC2, ..., ZGCi}, calculate the mean to obtain the photocatalytic treatment value ZGCJ within the treatment time, and calculate the difference to obtain the photocatalytic treatment variance ZGCF within the treatment time;

[0024] The photocatalytic treatment coefficient XG is calculated by the formula XG = a3*ZGCJ-a4*ZZGCF; wherein a3 and a4 are both proportional coefficients, a3 is 0.72, and a4 is 0.52;

[0025] Comparing the obtained photocatalytic treatment coefficient XG with the photocatalytic treatment coefficient threshold;

[0026] If the photocatalytic treatment coefficient XG is greater than the photocatalytic treatment coefficient threshold, a photocatalytic treatment qualified signal is generated;

[0027] If the photocatalytic treatment coefficient XG is less than the photocatalytic treatment coefficient threshold, a photocatalytic treatment failure signal is generated.

[0028] As a further solution of the present invention: in step 4,

[0029] Obtain the average temperature in the adsorbent placement chamber during the processing time and the temperature frequency corresponding to the average temperature, and mark them as TJX and TPX;

[0030] The adsorption temperature coefficient Xtx is calculated by the formula Xtx=b1*TJX+b2*TPX, where b1 and b2 are proportional coefficients, b1 is 0.92, and b2 is 0.87;

[0031] Substitute the obtained adsorption temperature coefficient Xtx and adsorption treatment coefficient XX into the formula XXY=Xtx / XX to calculate the adsorption temperature influence coefficient XXY;

[0032] Compare the obtained adsorption temperature influence coefficient XXY with the adsorption temperature influence coefficient threshold;

[0033] If the adsorption temperature influence coefficient XXY is greater than the adsorption temperature influence coefficient threshold, a temperature adjustment signal is generated to adjust the temperature in the adsorbent placement chamber;

[0034] If the adsorption temperature influence coefficient XXY is less than the adsorption temperature influence coefficient threshold, an adsorbent saturation signal is generated.

[0035] As a further solution of the present invention: obtaining the average temperature in the sealed cavity during the processing time and the temperature frequency corresponding to the average temperature, and marking them as TJG and TPG;

[0036] The photocatalytic temperature coefficient Xtg is calculated by the formula Xtg = b3*TJG+b4*TPG, where b3 and b4 are both proportional coefficients, b3 is 0.32, and b4 is 0.27;

[0037] Substitute the obtained photocatalytic temperature coefficient Xtg and the photocatalytic treatment coefficient XG into the formula XXG=Xtg / XG to calculate the photocatalytic temperature influence coefficient XXG;

[0038] Compare the obtained photocatalytic temperature influence coefficient XXG with the photocatalytic temperature influence coefficient threshold;

[0039] If the photocatalytic temperature influence coefficient XXG is greater than the photocatalytic temperature influence coefficient threshold, a temperature adjustment signal is generated;

[0040] If the photocatalytic temperature influence coefficient XXG is less than the photocatalytic temperature influence coefficient threshold, a photocatalyst deactivation signal is generated.

[0041] Beneficial effects of the present invention:

[0042] The method for treating VOCs in industrial waste gas of the present invention determines whether the treatment is qualified by comparing the import and export treatment efficiencies during the adsorption and photocatalytic processes. If the treatment is unqualified, the problem is found and the problems are solved, thereby ensuring that the treatment system can treat VOCs in industrial waste gas efficiently and stably, thereby improving its treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below with reference to the accompanying drawings.

[0044] Figure 1 It is a system block diagram of the processing system of the present invention. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] Example 1

[0047] See also Figure 1 As shown, the present invention is a system for treating VOC in industrial waste gas, comprising:

[0048] In the collection module, the exhaust gas enters the adsorbent placement chamber through the gas inlet, is adsorbed by the adsorbent, and then enters the sealed chamber. The gas entering the sealed chamber is catalyzed by the photocatalyst and then discharged through the exhaust port, thereby obtaining the VOC content value at the exhaust gas inlet, the VOC content value at the adsorption chamber outlet, and the VOC content value at the sealed chamber outlet, and marking them as the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 respectively.

[0049] The analysis module obtains the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 from the acquisition module, processes and analyzes them, and determines the treatment status of VOC in the industrial waste gas;

[0050] The specific working process of the analysis module is as follows:

[0051] Step 1: Obtain the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3, and calculate the waste gas treatment value ZFC using the formula ZFC=ZF1-(ZF2+ZF3);

[0052] Step 2: Compare the obtained exhaust gas treatment value ZFC with the exhaust gas treatment threshold;

[0053] If the exhaust gas treatment value ZFC is greater than the exhaust gas treatment threshold, it means that the adsorbent or photocatalyst has a low treatment efficiency problem, and a treatment failure signal is generated;

[0054] If the exhaust gas treatment value ZFC is less than the exhaust gas treatment threshold, it means that the adsorbent or photocatalyst treatment efficiency is high, and a treatment qualified signal is generated;

[0055] The fault module analyzes the processing efficiency of the adsorbent or photocatalyst upon receiving the processing failure signal from the analysis module;

[0056] The specific working process of the fault module is as follows:

[0057] Step 1: Obtain the first waste value ZF1 and the second waste value ZF2, and calculate the adsorption treatment value ZXC using the formula ZXC=ZF1-ZF2;

[0058] Divide the first L1 minutes of the treatment time into detection period i, where L1 is a quantity constant, i = 1, 2, ..., n, where n is a positive integer, and the duration of each detection period is equal; obtain the adsorption treatment value ZXCi in the detection period i, and construct the adsorption treatment set A{ZXC1, ZXC2, ..., ZXCi}, perform mean calculation to obtain the adsorption treatment mean ZXCJ within the treatment time, and perform difference calculation to obtain the adsorption treatment variance ZXCF within the treatment time;

[0059] The adsorption treatment coefficient XX is calculated by the formula XX=a1*ZXCJ-a2*ZXCF; wherein a1 and a2 are both proportional coefficients, a1 is 0.69, and a2 is 0.42;

[0060] Comparing the obtained adsorption treatment coefficient XX with the adsorption treatment coefficient threshold;

[0061] If the adsorption treatment coefficient XX is greater than the adsorption treatment coefficient threshold, an adsorption treatment qualified signal is generated;

[0062] If the adsorption treatment coefficient XX is less than the adsorption treatment coefficient threshold, an adsorption treatment unqualified signal is generated;

[0063] Step 2: Obtain the second waste value ZF2 and the third waste value ZF3, and calculate the photocatalytic treatment value ZGC using the formula ZXC=ZF2-ZF3;

[0064] Divide the first L1 minutes of the treatment time into detection period i, where L1 is a quantity constant, i = 1, 2, ..., n, n is a positive integer, and the duration of each detection period is equal; obtain the photocatalytic treatment value ZGCi in the detection period i, and construct the photocatalytic treatment value B{ZGC1, ZGC2, ..., ZGCi}, calculate the mean to obtain the photocatalytic treatment value ZGCJ within the treatment time, and calculate the difference to obtain the photocatalytic treatment variance ZGCF within the treatment time;

[0065] The photocatalytic treatment coefficient XG is calculated by the formula XG = a3*ZGCJ-a4*ZZGCF; wherein a3 and a4 are both proportional coefficients, a3 is 0.72, and a4 is 0.52;

[0066] Comparing the obtained photocatalytic treatment coefficient XG with the photocatalytic treatment coefficient threshold;

[0067] If the photocatalytic treatment coefficient XG is greater than the photocatalytic treatment coefficient threshold, a photocatalytic treatment qualified signal is generated;

[0068] If the photocatalytic treatment coefficient XG is less than the photocatalytic treatment coefficient threshold, a photocatalytic treatment failure signal is generated;

[0069] The processing module determines the problem of the fault and takes corresponding measures when it obtains the adsorption treatment failure signal and the photocatalytic treatment failure signal from the fault module;

[0070] The specific working process of the processing module is as follows:

[0071] Step 1: Obtain the average temperature in the adsorbent placement chamber during the processing time and the temperature frequency corresponding to the average temperature, and mark them as TJX and TPX;

[0072] The adsorption temperature coefficient Xtx is calculated by the formula Xtx=b1*TJX+b2*TPX, where b1 and b2 are proportional coefficients, b1 is 0.92, and b2 is 0.87;

[0073] Substitute the obtained adsorption temperature coefficient Xtx and adsorption treatment coefficient XX into the formula XXY=Xtx / XX to calculate the adsorption temperature influence coefficient XXY;

[0074] Compare the obtained adsorption temperature influence coefficient XXY with the adsorption temperature influence coefficient threshold;

[0075] If the adsorption temperature influence coefficient XXY is greater than the adsorption temperature influence coefficient threshold, it means that the temperature has a greater impact on the adsorption of the adsorbent, and a temperature adjustment signal is generated to control the temperature in the adsorbent placement chamber;

[0076] If the adsorption temperature influence coefficient XXY is less than the adsorption temperature influence coefficient threshold, it means that the temperature has little effect on the adsorption of the adsorbent, and an adsorbent saturation signal is generated, and the adsorbent is replaced;

[0077] Step 2: Obtain the average temperature in the sealed cavity during the processing time and the temperature frequency corresponding to the average temperature, and mark them as TJG and TPG;

[0078] The photocatalytic temperature coefficient Xtg is calculated by the formula Xtg = b3*TJG+b4*TPG, where b3 and b4 are both proportional coefficients, b3 is 0.32, and b4 is 0.27;

[0079] Substitute the obtained photocatalytic temperature coefficient Xtg and the photocatalytic treatment coefficient XG into the formula XXG=Xtg / XG to calculate the photocatalytic temperature influence coefficient XXG;

[0080] Compare the obtained photocatalytic temperature influence coefficient XXG with the photocatalytic temperature influence coefficient threshold;

[0081] If the photocatalytic temperature influence coefficient XXG is greater than the photocatalytic temperature influence coefficient threshold, it means that the temperature has a greater impact on the adsorption of the photocatalyst, and a temperature adjustment signal is generated to control the temperature in the sealed cavity;

[0082] If the photocatalytic temperature influence coefficient XXG is less than the photocatalytic temperature influence coefficient threshold, it means that the temperature has little effect on the adsorption of the adsorbent, and a photocatalyst deactivation signal is generated, and the photocatalyst is replaced.

[0083] Example 2

[0084] Based on the above embodiment 1, the present invention is a method for treating VOC in industrial waste gas, comprising the following steps:

[0085] Step 1: The waste gas enters the adsorbent placement chamber through the gas inlet, is adsorbed by the adsorbent, and then enters the sealed chamber; the gas entering the sealed chamber is catalyzed by the photocatalyst and then discharged through the exhaust port, thereby obtaining the VOC content value of the waste gas inlet, the VOC content value of the adsorption chamber outlet, and the VOC content value of the sealed chamber outlet, and are marked as the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 respectively;

[0086] Step 2: Obtain the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 from the acquisition module for processing and analysis to determine whether the treatment status of VOC in industrial waste gas is qualified;

[0087] Step 3: When the analysis module receives a processing failure signal, the adsorbent or photocatalyst processing efficiency is analyzed to determine the existing fault point;

[0088] Step 4: When the adsorption treatment failure signal and the photocatalytic treatment failure signal of the fault module are obtained, the fault problem is determined and corresponding processing is performed.

[0089] Working principle of the present invention: The method for treating VOC in industrial waste gas of the present invention judges whether the treatment is qualified by comparing the import and export treatment efficiency during the adsorption and photocatalytic processes. When it is unqualified, the problem is found and the problems are dealt with, thereby ensuring that the treatment system can treat VOC in industrial waste gas efficiently and stably, thereby improving its treatment efficiency.

[0090] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for treating VOC in industrial waste gas, characterized in that: The following steps are involved: Step 1: The waste gas enters the adsorbent placement chamber through the gas inlet, is adsorbed by the adsorbent, and then enters the sealed chamber; the gas entering the sealed chamber is catalyzed by the photocatalyst and then discharged through the exhaust port, thereby obtaining the VOC content value of the waste gas inlet, the VOC content value of the adsorption chamber outlet, and the VOC content value of the sealed chamber outlet, and are marked as the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 respectively; Step 2: Obtain the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 from the acquisition module for processing and analysis to determine whether the treatment status of VOC in industrial waste gas is qualified; Step 3: When the analysis module receives a processing failure signal, the adsorbent or photocatalyst processing efficiency is analyzed to determine the existing fault point; Step 4: When the adsorption treatment failure signal and the photocatalytic treatment failure signal of the fault module are obtained, the fault problem is determined and corresponding processing is performed; In step 3, The adsorption treatment value ZXC is calculated by the formula ZXC=ZF1-ZF2; Divide the first L1 minutes of the treatment time into detection period i, where L1 is a quantity constant, i = 1, 2, ..., n, where n is a positive integer, and the duration of each detection period is equal; obtain the adsorption treatment value ZXCi in the detection period i, and construct the adsorption treatment set A{ZXC1, ZXC2, ..., ZXCi}, perform mean calculation to obtain the adsorption treatment mean ZXCJ within the treatment time, and perform difference calculation to obtain the adsorption treatment variance ZXCF within the treatment time; The adsorption treatment coefficient XX is calculated by the formula XX=a1×ZXCJ-a2×ZXCF; where a1 and a2 are proportional coefficients, a1 is 0.69, and a2 is 0.42; Comparing the obtained adsorption treatment coefficient XX with the adsorption treatment coefficient threshold; If the adsorption treatment coefficient XX is greater than the adsorption treatment coefficient threshold, an adsorption treatment qualified signal is generated; If the adsorption process coefficient XX is less than the adsorption process coefficient threshold, an adsorption process failure signal is generated.

2. The method for treating VOC in industrial waste gas according to claim 1, characterized in that: In step 2, the first waste value ZF1, the second waste value ZF2, and the third waste value ZF3 are obtained, and the waste gas treatment value ZFC is calculated using the formula ZFC=ZF1-(ZF2+ZF3).

3. The method for treating VOC in industrial waste gas according to claim 2, characterized in that: Comparing the obtained exhaust gas treatment value ZFC with the exhaust gas treatment threshold; If the exhaust gas treatment value ZFC is greater than the exhaust gas treatment threshold, a treatment failure signal is generated; If the exhaust gas treatment value ZFC is less than the exhaust gas treatment threshold, a treatment qualified signal is generated.

4. The method for treating VOC in industrial waste gas according to claim 1, characterized in that: The photocatalytic treatment value ZGC is calculated by the formula ZGC=ZF2-ZF3; Divide the first L1 minutes of the treatment time into detection period i, where L1 is a quantity constant, i = 1, 2, ..., n, n is a positive integer, and the duration of each detection period is equal; obtain the photocatalytic treatment value ZGCi in the detection period i, and construct the photocatalytic treatment value B{ZGC1, ZGC2, ..., ZGCi}, calculate the mean to obtain the photocatalytic treatment value ZGCJ within the treatment time, and calculate the difference to obtain the photocatalytic treatment variance ZGCF within the treatment time; The photocatalytic treatment coefficient XG is calculated by the formula XG=a3×ZGCJ-a4×ZGCF; where a3 and a4 are proportional coefficients, a3 is 0.72, and a4 is 0.52; Comparing the obtained photocatalytic treatment coefficient XG with the photocatalytic treatment coefficient threshold; If the photocatalytic treatment coefficient XG is greater than the photocatalytic treatment coefficient threshold, a photocatalytic treatment qualified signal is generated; If the photocatalytic treatment coefficient XG is less than the photocatalytic treatment coefficient threshold, a photocatalytic treatment failure signal is generated.

5. The method for treating VOC in industrial waste gas according to claim 1, characterized in that: In step 4, Obtain the average temperature in the adsorbent placement chamber during the processing time and the temperature frequency corresponding to the average temperature, and mark them as TJX and TPX; The adsorption temperature coefficient Xtx is calculated by the formula Xtx=b1×TJX+b2×TPX, where b1 and b2 are proportional coefficients, b1 is 0.92, and b2 is 0.87; Substitute the obtained adsorption temperature coefficient Xtx and adsorption treatment coefficient XX into the formula XXY=Xtx / XX to calculate the adsorption temperature influence coefficient XXY; Compare the obtained adsorption temperature influence coefficient XXY with the adsorption temperature influence coefficient threshold; If the adsorption temperature influence coefficient XXY is greater than the adsorption temperature influence coefficient threshold, a temperature adjustment signal is generated to adjust the temperature in the adsorbent placement chamber; If the adsorption temperature influence coefficient XXY is less than the adsorption temperature influence coefficient threshold, an adsorbent saturation signal is generated.

6. The method for treating VOC in industrial waste gas according to claim 5, characterized in that: Obtain the average temperature in the sealed cavity during the processing time and the temperature frequency corresponding to the average temperature, and mark them as TJG and TPG; The photocatalytic temperature coefficient Xtg is calculated by the formula Xtg=b3×TJG+b4×TPG, where b3 and b4 are proportional coefficients, b3 is 0.32, and b4 is 0.27; Substitute the obtained photocatalytic temperature coefficient Xtg and photocatalytic treatment coefficient XG into the formula XXG=Xtg / XG to calculate the photocatalytic temperature influence coefficient XXG; Compare the obtained photocatalytic temperature influence coefficient XXG with the photocatalytic temperature influence coefficient threshold; If the photocatalytic temperature influence coefficient XXG is greater than the photocatalytic temperature influence coefficient threshold, a temperature adjustment signal is generated; If the photocatalytic temperature influence coefficient XXG is less than the photocatalytic temperature influence coefficient threshold, a photocatalyst deactivation signal is generated.

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