Method for analyzing flue gas pollution in the production of sintered bricks based on oil-based drilling deoiled products

Abstract

The application discloses a flue gas pollution analysis method for preparing sintered bricks based on oil-based drilling debris deoiled products, relates to the technical field of solid waste treatment and resource utilization, and solves the problem that in the prior art, when preparing sintered bricks by using the remaining products after oil-based drilling debris deoiling, there is a lack of a method for analyzing flue gas generated in the sintering process, and the technical scheme is as follows: the estimated emission concentration of a pollution factor is obtained by performing first-layer calculation and analysis on the parameters of the pollution factor in the brick blank raw material, environmental risk assessment is performed, and the influence of the flue gas generated in the sintering process on the environment is preliminarily determined. The pollutants in the flue gas in the brick mixing and sintering process are analyzed through first-layer calculation and second-layer calculation analysis, so that the analysis content is more comprehensive, and the analysis result is more accurate. The influence of the added deoiled remaining products on the atmospheric pollution in the sintered brick sintering process is determined, and technical support can be provided for the resource utilization of the remaining solid phase after deoiling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid waste treatment and resource utilization, more specifically, it relates to a flue gas pollution analysis method for preparing sintered bricks based on oil-based drilling debris deoiled products. BACKGROUND

[0002] The development of unconventional gas resources such as shale gas is a new growth pole for natural gas reserves and production, but the shale gas extraction process will produce a large amount of oil-based drilling debris, which will cause serious harm to the ecological environment and human health. For oil-based drilling debris produced in shale gas drilling, thermal desorption treatment is mainly used, but the residue after deoiling is still defined as hazardous waste. On January 1, 2022, Sichuan Provincial Standard "Standard for Utilization and Disposal of Residual Solid Phase after Comprehensive Utilization of Oil-containing Sludge in Natural Gas Exploration" (DB51T2850-2021) was formally implemented. When the residual solid phase after deoiling of oil-based drilling debris meets the corresponding limit value requirements, it can be used for paving well sites and well site roads, preparing sintered bricks, sintering ceramsite or cement kiln co-processing.

[0003] In the prior art, when oil-based drilling debris deoiled products are used to prepare sintered bricks, there is a lack of methods for analyzing the flue gas generated during the sintering process, and thus the impact of the flue gas generated during the sintering process on the environment cannot be determined, and environmental risk assessment cannot be performed to obtain representative results. SUMMARY

[0004] The purpose of the present application is to provide a flue gas pollution analysis method for preparing sintered bricks based on oil-based drilling debris deoiled products, which achieves the purpose of analyzing the flue gas generated during the sintering process, and further determines the impact of the flue gas generated during the sintering process on the environment.

[0005] The above technical purpose of the present application is achieved by the following technical solution:

[0006] The flue gas pollution analysis method for preparing sintered bricks based on oil-based drilling debris deoiled products comprises the following operations:

[0007] Obtain the parameters of the pollution factors in the brick billet raw materials when preparing sintered bricks from oil-based drilling debris deoiled products;

[0008] Perform first layer calculation on the parameters of the pollution factors in the brick billet raw materials to obtain the estimated emission concentration of the pollution factors;

[0009] Obtain the pollution factors that do not meet the first layer calculation and the pollution factors whose estimated emission concentration exceeds the standard;

[0010] Perform second layer calculation analysis on the pollution factors that do not meet the first layer calculation and the pollution factors whose estimated emission concentration exceeds the standard using a simulation test method to obtain the calculation emission concentration of the pollution factors that do not meet the first layer calculation and the pollution factors whose estimated emission concentration exceeds the standard;

[0011] The flue gas pollution analysis result is obtained by combining the estimated emission concentration and the calculated emission concentration.

[0012] Further, the calculation formula of the first layer calculation is specifically:

[0013]

[0014] Wherein, C is the estimated emission concentration, c i is the content of the pollution factor i in the green brick raw material, f i is the mass percentage of the pollution factor i in the green brick raw material, M is the mass of a single green brick, P is the hourly brick production, k is the molecular weight conversion coefficient, W is the dry-wet conversion coefficient, d is the desulfurization coefficient of the desulfurization tower, and L is the hourly ventilation volume.

[0015] Further, the pollution factors that do not satisfy the first layer calculation include polycyclic aromatic hydrocarbons and non-methane total hydrocarbons.

[0016] Further, the polycyclic aromatic hydrocarbons are collected by using XAD-2 resin.

[0017] Further, the simulation device in the simulation test method simulates the tunnel kiln firing of sintered bricks by using a tubular furnace, and collects flue gas for analysis.

[0018] Further, the simulation device includes a front-end gas source, a tubular furnace, and a rear-end gas collection device; the tubular furnace is connected between the front-end gas source and the rear-end gas collection device.

[0019] Further, the simulation device is cleaned with an organic solvent.

[0020] Further, the calculation formula of the second layer calculation analysis is specifically:

[0021]

[0022] Wherein: C1 is the calculated emission concentration, L is the hourly ventilation volume, P is the hourly brick production, M is the mass of a single green brick, and W1 is the total amount of flue gas pollutants emitted per unit mass of green brick in the tubular furnace simulation test.

[0023] Further, the calculation formula of the total amount of flue gas pollutants emitted per unit mass of green brick in the tubular furnace simulation test of the non-methane total hydrocarbons is specifically:

[0024]

[0025] Wherein: C2 is the concentration of pollutants in the flue gas of the tubular furnace test, V is the ventilation volume of the tubular furnace, W2 is the mass of the green brick sample in the tubular furnace test, and t is the firing time of the tubular furnace test.

[0026] Further, the pollution factor with the estimated emission concentration exceeding the standard is collected by using acid and alkali solution.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] ① Through the first layer calculation and analysis of the parameters of the pollution factors in the brick blank raw materials, the estimated emission concentration of the pollution factors is obtained, and the environmental risk assessment is carried out, and then the influence of the flue gas generated in the sintering process on the environment is preliminarily determined.

[0029] ② Through the first layer calculation and the second layer calculation analysis, the pollutants in the flue gas of the brick sintering process are analyzed respectively, so as to make the analysis content more comprehensive and the analysis result more accurate.

[0030] ③ The influence of the remaining product after adding deoiling on the atmospheric pollution in the sintering brick firing process is determined, which can provide technical support for the resource utilization of the remaining solid phase after deoiling. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings described herein are used to provide further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:

[0032] Figure 1 It is a schematic diagram of the estimated emission concentration of SO2 obtained by the first layer calculation in Example 1;

[0033] Figure 2 It is a schematic diagram of the estimated emission concentration of heavy metals obtained by the first layer calculation in Example 2;

[0034] Figure 3 It is a schematic diagram of the heavy metal content of the brick embryo before sintering in Example 3;

[0035] Figure 4 It is a schematic diagram of the calculated emission concentration obtained by the second layer calculation and analysis of heavy metals in Example 3;

[0036] Figure 5 It is a schematic diagram of the calculated emission concentration obtained by the second layer calculation and analysis of polycyclic aromatic hydrocarbons in Example 4;

[0037] Figure 6 It is a schematic diagram of the non-methane total hydrocarbon emission concentration obtained by the second layer calculation and analysis of blank bricks and mixed burning bricks in Example 5;

[0038] Figure 7 It is a schematic diagram of the structure of the simulation device in Example.

[0039] Markings in the drawings and corresponding names of parts:

[0040] 1-air steel cylinder; 2-tube furnace; 3-brick blank; 4-quartz wool; 5-empty gas collecting cylinder; 6-three-way valve; 7-gas collecting bag; 8-gas collecting cylinder; 9-resin. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with embodiments and drawings, and the schematic embodiments of the present application and the description thereof are only used for explaining the present application, but not as limitation to the present application.

[0042] In addition, the terms "first", "second" are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise explicitly and specifically limited.

[0043] Embodiment: flue gas pollution analysis method for preparing sintered brick based on oil-based drilling debris deoiled product.

[0044] Obtain the parameters of the pollution factors in the green brick raw materials when preparing sintered brick by using oil-based drilling debris deoiled product, specifically:

[0045] Obtain the parameters of the pollution factors in the green brick raw materials when preparing sintered brick by using oil-based drilling debris deoiled product, including the content of the pollution factors in the green brick raw materials, the mass percentage of the pollution factors in the green brick raw materials, the mass of single green brick, the brick production per hour, the molecular weight conversion coefficient, wherein the conversion coefficient of heavy metals and organic pollutants is 1, the conversion coefficient of SO2 is 64 / 32, the dry-wet conversion coefficient, the average dry mass ratio of green brick is 85%, the desulfurization coefficient of desulfurization tower is the average desulfurization efficiency of 90%, and the hourly ventilation volume.

[0046] The parameters of the pollution factors in the green brick raw materials are calculated in the first layer to obtain the estimated emission concentration of the pollution factors, specifically:

[0047] Assuming that all the pollutants in the raw materials during the firing process are discharged into the flue gas (the most unfavorable condition), the first layer calculation is performed on the pollution emission in the flue gas during the sintering process of the prepared brick to obtain the estimated emission concentration of the pollution factors. If the estimated emission concentration of the pollution factors does not exceed the standard, the result can be directly used; for the pollution factors (polycyclic aromatic hydrocarbons and non-methane total hydrocarbons) that do not meet the first layer calculation and the pollution factors whose estimated emission concentration exceeds the standard, the second layer calculation analysis is performed.

[0048] The estimated emission concentration of the pollution factors in the flue gas is calculated by formula (1):

[0049]

[0050] Wherein: C is the estimated emission concentration, mg / m 3 ; c i is the content of the pollution factor i in the green brick raw materials, mg / kg; fi M is the mass of a single brick, taking the average value of solid brick 2 kg / block; P is the amount of brick produced per hour, block / h; k is the molecular weight conversion coefficient, the conversion coefficient of heavy metals and organic pollutants is 1, and the conversion coefficient of SO2 is 64 / 32; W is the dry-wet conversion coefficient, taking the average dry mass ratio of 85%; d is the desulfurization coefficient of the desulfurization tower, taking the average desulfurization efficiency of 90%; L is the hourly ventilation volume, m 3 / h.

[0051] Obtain the pollution factors that do not meet the first layer calculation and the pollution factors whose estimated emission concentration exceeds the standard;

[0052] The pollution factors that do not meet the first layer calculation and the pollution factors whose estimated emission concentration exceeds the standard are analyzed by the second layer calculation, and the calculated emission concentration of the pollution factors that do not meet the first layer calculation and the pollution factors whose estimated emission concentration exceeds the standard is obtained, which is specifically:

[0053] The method of the second layer calculation analysis is a simulation test, a pipe furnace is used to simulate the tunnel kiln for firing sintered bricks, and the simulation device for organic pollutant emission in flue gas includes a front-end gas source, a pipe furnace, and a rear-end gas collection device. The collected flue gas is analyzed. For sulfur dioxide and heavy metals, the pollutants released into the flue gas do not change because the flue gas passes through the high-temperature section, and the difference between the emission amount and the actual generation amount is small, which can be judged by the first layer calculation. For organic pollutants, during the actual brick kiln firing process, the flue gas in some kiln sections will undergo secondary incineration when passing through the high-temperature section, so the actual emission amount of organic pollutants in the pipe furnace simulation test should be lower than the actual emission amount. Therefore, if the second calculation analysis result shows that the pollution emission concentration does not exceed the emission standard limit value, it can be judged that the pollutant does not exceed the emission standard, otherwise it cannot be judged that the pollutant exceeds the standard.

[0054] 1) Collection method of organic pollutants in flue gas;

[0055] ① Before the test, all glassware and XAD-2 resin 9 are cleaned with an organic solvent to remove organic matter interference;

[0056] ② Put the prepared brick billets 3 into the heating center position of the pipe furnace 2, seal the two ends of the furnace tube, and check the air tightness. The test sample is cut into about 50x50x90mm according to the needs of the furnace chamber. The blank group and the optimal addition ratio group are tested in triplicate;

[0057] ③The gas outlet end of the tube furnace is connected to two empty gas collection bottles 5 in turn to collect the generated water vapor. A quartz wool 4 is placed in front of the gas collection bottle to filter particulate matter. A three-way valve 6 is connected to the rear end of the gas collection bottle, one end of which is connected to a gas bag 7, and the other end is connected to a gas collection bottle 8 containing 30 g of XAD-2 resin 9, which is used to absorb polycyclic aromatic hydrocarbons.

[0058] ④Open the air cylinder 1 and set the air flow rate according to the actual size of the brick blank and the calculated test ventilation amount;

[0059] ⑤Set the tube furnace 2 temperature program: from room temperature to 100℃ at 10℃ / min, then to 1000℃ at 0.98℃ / min;

[0060] ⑥Stop heating and maintain the ventilation rate. The brick blank 3 continues to burn and naturally cools down after burning out.

[0061] ⑦According to HJ 38-2017, use the gas bag to collect non-methane total hydrocarbon samples. The gas collection bag is used to collect gas at 100℃, 150℃, 200℃, 250℃, 300℃, 350℃, 400℃, 500℃, 600℃, 800℃ and 1000℃, respectively, to detect the release concentration of non-methane total hydrocarbon. The total amount of non-methane total hydrocarbon is calculated according to the release concentration and ventilation amount.

[0062] ⑧To ensure the collection efficiency of polycyclic aromatic hydrocarbons, replace the resin 9 at 400℃, 700℃ and 1000℃ during the whole brick burning process. When the brick cools down to about 50℃, the test is completed. Mix the collected resin 9 evenly and detect the total amount of polycyclic aromatic hydrocarbons. Calculate the emission concentration in flue gas based on the total ventilation amount during the test.

[0063] 2) Collection method of heavy metals in flue gas;

[0064] The absorption method of heavy metals is determined according to EPA-Method-29, and the mixed solution of 5% HNO3+10% H2O2 is used as the absorption solution. In order to simulate the influence of the desulfurization process of the brick kiln flue gas on the emission of heavy metals in the actual production process, 10% NaOH absorption solution is used to collect heavy metals in the flue gas before the mixed absorption solution is used. The test device is as follows:

[0065] The gas outlet end of the tube furnace is connected to two empty gas collection bottles 5 in turn to collect the generated water vapor. A quartz wool 4 is placed in front of the gas collection bottle to filter particulate matter. A three-way valve 6 is connected to the rear end of the gas collection bottle, one end of which is connected to a gas bag 7, and the other end is connected to a gas collection bottle 8 containing 30 g of XAD-2 resin 9, which is used to absorb polycyclic aromatic hydrocarbons;

[0066] In the second layer of calculation and analysis, the emission concentration of pollutants in the flue gas is calculated by the total amount of flue gas pollutants emitted per unit mass of brick blank and the flue gas volume, as shown in formula (2):

[0067]

[0068] Wherein, C1 is the calculated emission concentration, mg / m 3 ; L is the hourly ventilation rate, m 3 / h; P is the brick production per hour, pieces / h; M is the single brick weight, taking the average value of solid brick 2 kg / piece; W1 is the total amount of flue gas pollutants emitted per unit mass of brick in the pipe furnace simulation test, mg / g.

[0069] In the second layer analysis method, for non-methane total hydrocarbon pollutants, the total amount of flue gas pollutants emitted per unit mass of brick is obtained according to the integral of the test flue gas concentration and the ventilation rate using formula (3):

[0070]

[0071] Wherein, C2 is the pollutant concentration in the pipe furnace test flue gas, mg / m 3 ; V is the pipe furnace ventilation rate, m 3 / h; W2 is the mass of the pipe furnace test brick sample, g; t is the pipe furnace test firing time, min.

[0072] Example 1

[0073] The first layer calculation method is used to evaluate the sulfur dioxide concentration in the firing flue gas. It is assumed that under the most unfavorable conditions, sulfur elements are released in the form of sulfur dioxide, and the estimated emission concentration of sulfur dioxide is calculated. The estimated emission concentration of sulfur dioxide calculated by the first layer calculation method is shown in Table Figure 1 , which is the maximum possible emission concentration of sulfur dioxide at this time. The results show that the preparation of the brick with the remaining solid phase after oil-based rock debris is deoiled significantly increases the sulfur dioxide emission concentration, mainly due to the high sulfur element content in the residue, but the maximum emission concentration is still lower than the limit value specified in the “Brick and Tile Industry Air Pollutant Emission Standard”.

[0074] Example 2

[0075] The first layer calculation method is used to evaluate the heavy metal concentration in the firing flue gas. The estimated emission concentration of heavy metals calculated by the first layer calculation method is shown in Table Figure 2As shown in the table, the emissions of other heavy metals in the flue gas from blank bricks and blended bricks, except for barium, are not significantly different. However, the high barium content in the residual solid phase after degreasing of oil-based rock cuttings results in a much higher barium content in the flue gas from blended bricks compared to that from blank bricks. Since there are currently no heavy metal emission standards for the brick and tile industry, the emission concentrations of heavy metal pollutants are compared with the limits in the "Standard for Pollution Control of Hazardous Waste Incineration". The results show that the levels of heavy metals such as arsenic, cadmium, chromium, lead, and thallium in the flue gas from both blank and blended bricks exceed the standards for pollution control of hazardous waste incineration. Even under the worst-case scenario, calculations suggest that even without the addition of residual solid phase after degreasing of oil-based rock cuttings, there is still a possibility of excessive heavy metal emissions in the flue gas during the brick firing process. In reality, not all heavy metals are released into the flue gas during brick firing. Therefore, the estimated emission concentrations obtained from the first-level calculation analysis cannot determine whether there are excessive heavy metal emissions in the flue gas during the firing process. A second-level calculation analysis experiment is needed to assess the emissions of heavy metals such as arsenic, cadmium, chromium, lead, and thallium during the actual brick firing process.

[0076] Example 3

[0077] Obtain the heavy metal content of the brick blank before sintering, such as Figure 3 As shown in the table, a heavy metal emission simulation experiment was conducted using the second-level calculation and analysis evaluation method, and the heavy metal emission concentration in the brick kiln flue gas was further calculated using formula (2). The calculated emission concentrations of heavy metals obtained from the second-level calculation and analysis are shown in the table below. Figure 4 As shown in the table below. Figure 4 Combination Figure 3 It is evident that the addition of the residual solid phase from the deoiling of oil-based rock cuttings during the brick-making process significantly increased the emission concentrations of heavy metals such as cadmium, nickel, lead, thallium, and zinc in the flue gas, while having a relatively small impact on the emission of other metals. The increase in heavy metal concentration in the flue gas may stem from two aspects: firstly, the heavy metal content in the residual solid phase from the deoiling of oil-based rock cuttings is higher than that in the brick-making raw materials; secondly, the introduction of chlorine from the oil-based rock cutting residue increases the volatility of heavy metals. Overall, the emission concentration of heavy metals in the flue gas is far below the limits specified in the pollution control standards for hazardous waste incineration, and flue gas desulfurization during brick kiln production can further reduce heavy metal emissions. Therefore, it is inferred that the likelihood of exceeding heavy metal emission standards in the flue gas due to the addition of residual solid phase from the deoiling of oil-based rock cuttings at a 40% blending ratio in brick preparation is low.

[0078] Example 4

[0079] A second-level computational analysis and evaluation method was used to conduct a polycyclic aromatic hydrocarbon (PAH) emission simulation experiment. The PAH emission concentration in the brick kiln flue gas was further calculated using formula (2). The calculated emission concentrations obtained from the second-level PAH computational analysis are as follows: Figure 5As shown in the table, the test results indicate that only naphthalene was detected in the flue gas from blank bricks, while naphthalene and phenanthrene were detected in the flue gas from blended bricks. Other polycyclic aromatic hydrocarbons (PAHs) were all below the detection limit. The addition of the remaining solid phase after deoiling of oil-based rock cuttings did not significantly affect the emission concentration of PAHs in the flue gas. Therefore, the possibility of PAH emissions exceeding the standard in the flue gas is low when bricks are prepared with a 40% blending ratio.

[0080] Example 5

[0081] A second-level computational analysis and evaluation method was used to conduct a simulation experiment on non-methane total hydrocarbon emissions. The non-methane total hydrocarbon emission concentrations were obtained from the second-level computational analysis of blank bricks and blended bricks, as shown in the figure. Figure 6 The results shown in the table are from Figure 6 The results shown in the table indicate that, compared to blank bricks, the addition of oil-based rock cuttings and the resulting solid phase after degreasing did not significantly alter the non-methane total hydrocarbon emissions in the flue gas during the firing process. Currently, my country does not have emission limits for non-methane total hydrocarbons in the brick and tile industry. Referring to the "General Emission Standard for Air Pollutants," the emission limit for non-methane total hydrocarbons is 120 mg / m³. 3 Therefore, it can be inferred that the possibility of exceeding the emission standard for non-methane total hydrocarbons in flue gas is low if the brick is prepared by adding the remaining solid phase after degreasing oil-based rock cuttings at a blending ratio of 40%.

[0082] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for flue gas pollution analysis in the preparation of sintered bricks based on oil-based rock cuttings deoiling products, characterized in that, Includes the following operations: To obtain parameters of contaminants in the raw materials for sintered bricks when preparing oil-based rock cuttings from deoiled products; The parameters of pollutants in the raw materials for brick blanks are calculated in the first layer to obtain the estimated emission concentration of the pollutants. Obtain pollutants that do not meet the first-level calculation and estimate the pollutants whose emission concentrations exceed the standards, wherein the pollutants that do not meet the first-level calculation include polycyclic aromatic hydrocarbons and non-methane total hydrocarbons; A simulation test method is used to perform a second-level calculation analysis on the pollutants that do not meet the first-level calculation and the pollutants whose estimated emission concentration exceeds the standard, so as to obtain the calculated emission concentration of the pollutants that do not meet the first-level calculation and the pollutants whose estimated emission concentration exceeds the standard. In the simulation test method, the simulation device uses a tubular furnace to simulate the firing of sintered bricks in a tunnel kiln and collects flue gas for analysis. By combining the estimated emission concentration and the calculated emission concentration, the results of the flue gas pollution analysis are obtained, among which, The calculation formula for the first layer is as follows: ； in, To estimate emission concentrations, Pollutants in brick raw materials The content, Pollutants in brick blank raw materials mass percentage, For the weight of a single brick blank, This refers to the brick production rate per hour. The molecular weight conversion factor. The dry-to-wet conversion coefficient, The desulfurization coefficient of the desulfurization tower. Hourly ventilation volume; The calculation formula for the second layer of calculation analysis is as follows: ； in: To calculate emission concentration, Hourly ventilation volume This refers to the brick production rate per hour. For the weight of a single brick blank, This represents the total amount of flue gas pollutants emitted per unit mass of brick blanks in a tubular furnace simulation test.

2. The method for flue gas pollution analysis of sintered bricks prepared from oil-based rock cuttings deoiling products according to claim 1, characterized in that: The polycyclic aromatic hydrocarbons were collected using XAD-2 resin.

3. The method for flue gas pollution analysis of sintered bricks prepared based on oil-based rock cuttings deoiling products according to claim 1, characterized in that: The simulation device includes a front-end gas source, a tubular furnace, and a rear-end gas collection device; The tubular furnace is connected between the front-end gas source and the rear-end gas collection device.

4. The method for flue gas pollution analysis of sintered bricks prepared based on oil-based rock cuttings deoiling products according to claim 3, characterized in that: The simulation device was cleaned with an organic solvent.

5. The method for flue gas pollution analysis of sintered bricks prepared from oil-based rock cuttings deoiling products according to claim 4, characterized in that, The specific formula for calculating the total amount of flue gas pollutants emitted per unit mass of brick blanks in the tubular furnace simulation test of non-methane total hydrocarbons is as follows: ； in: The concentration of pollutants in the flue gas of the tubular furnace test. This refers to the air flow rate of the tubular furnace. For the test brick blanks of the tube furnace, The firing time for the tubular furnace test.

6. The method for flue gas pollution analysis of sintered bricks prepared based on oil-based rock cuttings deoiling products according to claim 1, characterized in that: The pollutants whose estimated emission concentrations exceed the standards are collected using acid and alkali solutions.

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