CN111534350A - Oil-based rock debris pretreatment method for mixed coal combustion - Google Patents
Oil-based rock debris pretreatment method for mixed coal combustion Download PDFInfo
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- CN111534350A CN111534350A CN202010339258.XA CN202010339258A CN111534350A CN 111534350 A CN111534350 A CN 111534350A CN 202010339258 A CN202010339258 A CN 202010339258A CN 111534350 A CN111534350 A CN 111534350A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/48—Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/02—Use of additives to fuels or fires for particular purposes for reducing smoke development
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
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Abstract
The invention discloses an oil-based rock debris pretreatment method for mixed coal combustion, which comprises the following steps of: (1) adding a chemical conditioner into oil-based rock debris in the oil-based drilling operation industry, and stirring and homogenizing in a stirrer to obtain conditioned oil-based rock debris; (2) adding a stabilizer into the conditioned oil-based rock debris, and fully and uniformly stirring in a uniformly mixing device to obtain stable oil-based rock debris; (3) adding a certain proportion of coal powder into the stabilized oil-based rock debris, and fully and uniformly mixing; (4) granulating the stable oil-based rock debris; (5) and adding the granulated oil-based rock debris and the fire coal into a coal grinding system, and then, feeding the mixture into a circulating fluidized bed for combustion. The oil-based rock debris pretreatment method for mixed coal combustion provided by the invention can reduce the emission of harmful gases, is energy-saving and environment-friendly, and can effectively reduce the viscosity of the oil-based rock debris and prevent the occurrence of a blocking phenomenon.
Description
Technical Field
The invention relates to the technical field of treatment of oil-based mud rock debris, in particular to an oil-based rock debris pretreatment method for mixed coal combustion.
Background
The oil-based drilling fluid is mainly used for drilling operation of horizontal wells and directional wells, compared with water-based drilling fluid, the oil-based drilling fluid has the characteristics of inhibiting water swelling of stratums, resisting high temperature, resisting salt and calcium corrosion and the like, is beneficial to stabilizing well walls, has small damage to oil and gas reservoirs, has good lubricity and the like, and can greatly reduce risks of well wall collapse, drilling sticking, oil and gas reservoir damage and the like due to the use of the oil-based drilling fluid in horizontal section drilling operation. At the same time, a large amount of oil-based rock debris is generated in the construction process, and after the oil-based drilling fluid returns from the well bore annulus, the oil-based rock debris subjected to on-site preliminary pretreatment is in loose granular shape, the grain diameter of the oil-based rock debris is usually less than 5mm, the content of calcium carbonate is 4-13%, and the oil content is usually about 3.5%. The oil-based rock debris contains a large amount of odorous toxic substances such as benzene series, phenols, anthracene, pyrene and the like, if the oil-based rock debris is not treated, the oil-based rock debris is directly discharged, not only a large amount of cultivated land is occupied, but also the surrounding soil, water and air are polluted, and the sludge also contains a large amount of heavy metals such as pathogenic bacteria, parasites (eggs), copper, zinc, chromium, mercury and the like, salts, polychlorinated biphenyl, dioxin, radionuclide and other refractory toxic and harmful substances. At present, the oil sludge and sand shavings are listed as dangerous waste by the nation.
At present, a plurality of oil fields and some scientific research units at home and abroad do a great deal of research work on the treatment of the oil sludge sand, and a plurality of methods for harmless treatment and resource treatment of the oil sludge sand are provided, such as: the method comprises an incineration method, a separation method and a biodegradation method, but many methods have the characteristics of simplicity, practicability, economy and the like, so that the general applicability is limited, and the wide popularization and application are difficult. In addition, the content of calcium carbonate in the oil-based rock debris is 5-13%, the oil content is about 3%, and from the aspects and requirements of fully utilizing energy and fixing sulfur of a coal-fired boiler, the oil-based rock debris is suitable for being directly doped and burnt in a fluidized bed boiler, SO that the energy is favorably utilized, the calcium carbonate in the mixed oil-based rock debris can be fully utilized to fix sulfur in combustion, and SO in smoke is reduced2The amount of discharge of (c).
However, the oil-based detritus is uniformly mixed and then is conveyed to a boiler for combustion in the conventional combustion mode, the coarse treatment mode is insufficient in crushing and incomplete in uniform mixing, and the oil-based detritus is easy to bond in a treatment system before combustion due to large viscosity and blocks a machine.
Therefore, the problem to be solved by those skilled in the art is how to provide an oil-based rock debris pretreatment method for coal blending combustion, which is energy-saving and environment-friendly and can effectively prevent blockage.
Disclosure of Invention
In view of the above, the invention provides a pretreatment method of oil-based rock debris for mixed coal combustion, which can reduce the emission of harmful gases, save energy, protect environment, effectively reduce the viscosity of the oil-based rock debris, and prevent the occurrence of blockage.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oil-based rock debris pretreatment method for mixed coal combustion comprises the following steps:
(1) adding a chemical conditioner into oil-based rock debris in the oil-based drilling operation industry, and stirring and homogenizing in a stirrer to obtain conditioned oil-based rock debris;
(2) adding a stabilizer into the conditioned oil-based rock debris, and fully and uniformly stirring in a uniformly mixing device to obtain stable oil-based rock debris;
(3) adding a certain proportion of coal powder into the stabilized oil-based rock debris, and fully and uniformly mixing.
(4) Granulating the stable oil-based rock debris;
(5) and adding the granulated oil-based rock debris and the fire coal into a coal grinding system, and then, feeding the mixture into a circulating fluidized bed for combustion.
Preferably, in the above oil-based rock debris pretreatment method for mixed coal combustion, in the step (1), the addition amount of the chemical conditioner is 10-60% of the mass of the oil-based rock debris.
The beneficial effects of the above technical scheme are: the chemical conditioner is used for changing the viscosity of the oil-based rock debris to reduce the viscosity of the oil-based rock debris; the addition amount of the chemical conditioner is determined on the premise that the chemical conditioner does not stick in a treatment system before combustion and blocks a machine.
Preferably, in the above oil-based rock debris pretreatment method for mixed coal combustion, in the step (1), the chemical conditioner is formed by mixing polyvinyl pyridinium, polyethyleneimine and pulverized coal in a mass ratio of 1:1-5: 5-20.
The beneficial effects of the above technical scheme are: the chemical conditioners polyvinyl pyridinium and polyethyleneimine are used for changing the viscosity of the oil-based rock debris and reducing the viscosity of the oil-based rock debris; the coal powder not only has the function of reducing viscosity, but also is beneficial to improving the heat value of the recycling (burning after granulation) of the rock debris of the oil engine.
Preferably, in the above oil-based rock debris pretreatment method for mixed coal combustion, in the step (2), the stabilizer is CaO and NaCO3、CaCO3Any one or a combination of several of them.
The beneficial effects of the above technical scheme are: the stabilizer has the function of reducing and adjusting the viscosity of the oil-based rock debris and the chemical conditioner after the combined action; and can be used as a calcium-based substance in the coal-fired boiler after the viscosity is adjusted to play a role in sulfur fixation, SO that SO in the flue gas of the coal-fired boiler is reduced2And (4) discharging.
Preferably, in the above oil-based rock debris pretreatment method for mixed coal combustion, in the step (2), the addition amount of the stabilizer is 2-10% of the mass of the oil-based rock debris.
Preferably, in the above oil-based rock debris pretreatment method for mixed coal combustion, in the step (4), the mass ratio of the granulated oil-based rock debris to the fire coal is 1:10-100, that is, the addition ratio of the granulated mixture to the fire coal during combustion in a boiler is 1-10%.
The beneficial effects of the above technical scheme are: when the addition amount of the fire coal is minimum, the granulated substance can be fully combusted, namely no oily substance is left, and harmless treatment is finished; when the mass ratio of the granulated oil engine rock debris is maximum, the Ca component contained in the granulated oil engine rock debris is the maximum adding ratio in the sulfur fixation in a coal-fired boiler.
According to the technical scheme, compared with the prior art, the oil-based rock debris pretreatment method for mixed coal combustion is disclosed and provided, not only can the viscosity of the oil-based rock debris be reduced and the occurrence of blockage and the like be prevented, but also the oil-based rock debris is addedAdding beneficial substances CaO and CaCO3Can be used as a stabilizer, is favorable for sulfur fixation of a circulating fluidized bed system in combustion, and reduces SO in subsequent flue gas2The treatment concentration of the coal-fired flue gas system is beneficial to the reduction and emission reduction of toxic and harmful gases in the coal-fired flue gas system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of the apparatus used in the method of the present invention.
In fig. 1:
1 is a stirrer, 2 is a heating and homogenizing device, 3 is flue gas waste heat air introduction, 4 is a granulator, 5 is a belt conveyor, and 6 is a coal burning system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention adopts oil-based detritus generated after operation of a certain oil-based drilling platform, and after primary concentration treatment, the oil sludge comprises the following components: 70% of water, 8% of oil, 6% of calcium oxide and the balance of SiO2And the like.
The equipment used in the process of the following examples is shown in FIG. 1.
Example 1:
the process is briefly described as follows:
1. adding polyvinyl pyridinium and polyethyleneimine into oil-based detritus mud (hereinafter referred to as oil-based detritus as YLX) generated by oil-based drilling operation according to the proportion of 1:1:10, wherein the mass ratio of the total mass of the chemical conditioner to the oil-based detritus is 1:10, and homogenizing the chemical conditioner in a stirrer 1 (hereinafter referred to as YLX-C type oil-based detritus after conditioning);
2. and (3) performing chemical conditioning on the YLX-C type substance according to the proportion of CaO: NaCO3The compound stabilizer is added according to the proportion of 2:1, the total addition amount of the compound stabilizer is 5 percent of the mass of the oil engine rock debris, and the oil-based rock debris and the compound thereof are added and fully stirred and uniformly mixed in a mixer for stabilization (hereinafter referred to as YLX-S type);
3. adding the coal powder with the proportion in the step 1 into the YLX-S type, and fully and uniformly mixing (hereinafter referred to as YLX-SC type);
4. the uniformly mixed YLX-SC type oil-based rock debris is heated in a heating and homogenizing device 2 by using the flue gas waste heat 3 of the coal-fired power plant to remove water.
5. Granulating the YLX-SC type oil-based rock debris subjected to moisture removal in a granulator 3;
6. the granulated YLX-SC type compound is added into a coal-fired boiler system 6 through a belt conveyor 5 according to the proportion of the on-site working conditions, so that the harmless treatment is completed, and the sulfur fixation of the boiler system in the combustion is facilitated.
Example 2:
the process is briefly described as follows:
1. adding a chemical conditioner polyvinyl pyridine salt, polyethyleneimine and pulverized coal into oil-based detritus mud (hereinafter referred to as oil-based detritus as YLX) generated by oil-based drilling operation according to the proportion of 2:5:20, wherein the mass ratio of the chemical conditioner to the oil-based detritus is 3:10, and homogenizing the chemical conditioner in a stirrer 1 (hereinafter referred to as YLX-F type oil-based detritus after conditioning);
2. and (3) performing chemical conditioning on the YLX-F type substance according to the proportion of CaO: CaCO3The compound stabilizer is added according to the proportion of 2:1, the addition amount of the compound stabilizer is 7 percent, and the oil-based rock debris and the compound thereof are added and fully stirred, uniformly mixed and stabilized in a mixer (hereinafter referred to as YLX-T type);
3. the uniformly mixed YLX-T type oil-based rock debris is heated in a heating and homogenizing device 2 by using the flue gas waste heat 3 of the coal-fired power plant to remove water.
5. Granulating the YLX-T type oil-based rock debris subjected to moisture removal in a granulator 3;
6. and (3) adding the granulated YLX-T type compound into a coal-fired boiler system 6 through a belt conveyor 5 according to the proportion of the site working conditions, wherein the adding proportion is 10 percent of the proportion of the coal in the boiler, so that the harmless treatment of the oil engine rock debris is completed, and meanwhile, Ca in the YLX-T type oil engine rock debris compound is beneficial to sulfur fixation of the boiler system in the combustion process.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The oil-based rock debris pretreatment method for mixed coal combustion is characterized by comprising the following steps of:
(1) adding a chemical conditioner into oil-based rock debris in the oil-based drilling operation industry, and stirring and homogenizing in a stirrer to obtain conditioned oil-based rock debris;
(2) adding a stabilizer into the conditioned oil-based rock debris, and fully and uniformly stirring in a uniformly mixing device to obtain stable oil-based rock debris;
(3) adding a certain proportion of coal powder into the stabilized oil-based rock debris, and fully and uniformly mixing.
(4) Granulating the stable oil-based rock debris;
(5) and adding the granulated oil-based rock debris and the fire coal into a coal grinding system, and then, feeding the mixture into a circulating fluidized bed for combustion.
2. The method for pretreating oil-based rock debris for mixed coal combustion as claimed in claim 1, wherein in the step (1), the addition amount of the chemical conditioner is 10-60% of the mass of the oil-based rock debris.
3. The oil-based rock debris pretreatment method for coal blending combustion as claimed in claim 1 or 2, wherein in the step (1), the chemical conditioner is formed by mixing polyvinyl pyridinium, polyethyleneimine and pulverized coal in a mass ratio of 1:1-5: 5-20.
4. The method for pretreating oil-based rock debris for mixed coal combustion as claimed in claim 1, wherein in the step (2), the stabilizing agent is CaO and NaCO3、CaCO3Or a combination of any two thereof.
5. The oil-based rock debris pretreatment method for coal blending combustion as claimed in claim 1 or 4, wherein in the step (2), the addition amount of the stabilizer is 2-10% of the quality of the oil-based rock debris.
6. The oil-based rock debris pretreatment method for coal blending combustion as claimed in claim 1, wherein in the step (4), the mass ratio of the granulated oil-based rock debris to the fire coal is 1: 10-100.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112710002A (en) * | 2021-02-04 | 2021-04-27 | 国家电投集团贵州金元绥阳产业有限公司 | Method for treating oil-based rock debris by using pulverized coal fired boiler |
| CN113355122A (en) * | 2021-05-29 | 2021-09-07 | 浙江红狮环保股份有限公司 | Method for cooperatively treating drilling cuttings by cement kiln |
| CN113429193A (en) * | 2021-07-09 | 2021-09-24 | 中冶南方都市环保工程技术股份有限公司 | Novel water storage environment functional material and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710002A (en) * | 2021-02-04 | 2021-04-27 | 国家电投集团贵州金元绥阳产业有限公司 | Method for treating oil-based rock debris by using pulverized coal fired boiler |
| CN113355122A (en) * | 2021-05-29 | 2021-09-07 | 浙江红狮环保股份有限公司 | Method for cooperatively treating drilling cuttings by cement kiln |
| CN113355122B (en) * | 2021-05-29 | 2022-12-13 | 浙江红狮环保股份有限公司 | Method for cooperatively treating drilling cuttings by cement kiln |
| CN113429193A (en) * | 2021-07-09 | 2021-09-24 | 中冶南方都市环保工程技术股份有限公司 | Novel water storage environment functional material and preparation method thereof |
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