阅读说明：本技术 一种用于混煤燃烧的油基岩屑预处理方法 (Oil-based rock debris pretreatment method for mixed coal combustion ) 是由 胡将军 汪远 于 2020-04-26 设计创作，主要内容包括：本发明公开了一种用于混煤燃烧的油基岩屑预处理方法,包括以下步骤：(1)将油基钻井作业产业的油基岩屑中加入化学调理剂,在搅拌机中进行搅拌匀化,得到调理后的油基岩屑；(2)在调理后的油基岩屑中添加稳定剂,在混匀器中充分搅拌均匀,得到稳定的油基岩屑；(3)向稳定后的油基岩屑中加入一定比例的煤粉,充分混匀；(4)对稳定的油基岩屑进行造粒处理；(5)将造粒后的油基岩屑与燃煤加入磨煤系统中,随后进入循环流化床中燃烧。本发明提供的用于混煤燃烧的油基岩屑预处理方法,不仅能减少有害气体的排放,节能环保,而且能有效降低油基岩屑的粘性,防止堵塞现象的发生。(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.)

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.

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.