CN113061470A - Method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification - Google Patents

Method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification Download PDF

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CN113061470A
CN113061470A CN202110306536.6A CN202110306536A CN113061470A CN 113061470 A CN113061470 A CN 113061470A CN 202110306536 A CN202110306536 A CN 202110306536A CN 113061470 A CN113061470 A CN 113061470A
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organic wastewater
burner
channel
difficulty organic
difficulty
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CN113061470B (en
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任冰涛
李吉辉
高建平
徐胜强
房秀燕
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Shandong Mingquan New Material Technology Co ltd
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Shandong Mingquan New Material Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/50—Fuel charging devices
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2200/00—Details of gasification apparatus
    • C10J2200/15—Details of feeding means
    • C10J2200/152—Nozzles or lances for introducing gas, liquids or suspensions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0959—Oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water

Abstract

The invention discloses a method for treating high-difficulty organic wastewater by gasifying multi-nozzle pulverized coal, belonging to the field of pulverized coal pressure gasification, aiming at solving the technical problem of improving the treatment capacity and treatment quality of the high-difficulty organic wastewater, and adopting the technical scheme that: the method comprises the following specific steps: after the feeding of the pulverized coal burner and the normal supply stop of fuel and oxygen of the start-up burner, introducing high-difficulty organic wastewater into the start-up burner through a high-difficulty organic wastewater inlet, premixing the high-difficulty organic wastewater with fuel pipeline shielding gas CO2 in the start-up burner, and discharging the high-difficulty organic wastewater from the start-up burner; the high-difficulty organic wastewater collides, is mixed and is atomized with clean high-pressure nitrogen of an oxygen pipeline of the start-up burner at a discharge port of the start-up burner; after being atomized by a start-up burner, the high-difficulty organic wastewater participates in the reaction in the top-spraying multi-nozzle gasification furnace to generate feed gas mainly comprising CO and H2.

Description

Method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification
Technical Field
The invention relates to the field of pulverized coal pressure gasification, in particular to a method for treating high-difficulty organic wastewater by utilizing multi-nozzle pulverized coal gasification.
Background
The high-difficulty organic wastewater has complex water quality, not only refers to wastewater containing higher organic matters, but also refers to wastewater containing high VOC (volatile organic compounds) or toxic and harmful organic matters, so that the treatment cost is too high, the treatment difficulty is higher, and corresponding treatment technologies are lacked, which is one of the key points and difficulties in industrial wastewater treatment.
At present, the method for treating organic wastewater by using a coal water slurry pressure gasification technology is one of the methods capable of better solving the problem, but the method cannot treat high-difficulty organic wastewater containing high VOC or being dangerous and toxic due to the limitation of the process technology. Therefore, how to improve the treatment capacity and the treatment quality of the high-difficulty organic wastewater is a problem to be solved urgently at present.
Disclosure of Invention
The technical task of the invention is to provide a method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification, so as to solve the problem of how to improve the treatment capacity and treatment quality of the high-difficulty organic wastewater.
The technical task of the invention is realized in the following way, namely a method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification, which comprises the following steps:
after the pulverized coal burner is put into the burner and the fuel and oxygen of the start-up burner are normally stopped to be supplied, the high-difficulty organic wastewater is introduced into the start-up burner through the high-difficulty organic wastewater inlet, and CO and fuel pipeline shielding gas are introduced into the start-up burner2After premixing, discharging from a start-up burner;
the high-difficulty organic wastewater collides, is mixed and is atomized with clean high-pressure nitrogen of an oxygen pipeline of the start-up burner at a discharge port of the start-up burner;
after the high-difficulty organic wastewater is atomized by the start-up burner, the high-difficulty organic wastewater participates in the reaction in the top-spraying multi-nozzle gasification furnace to generate CO and H2Mainly used as raw material gas.
Preferably, the start-up burner is positioned at the center of the top-spraying multi-nozzle gasification furnace, and the pulverized coal burners are circumferentially distributed on the top of the top-spraying multi-nozzle gasification furnace by taking the start-up burner as a circle center, so that the secondary reaction of the high-difficulty organic wastewater and the pulverized coal and the reactant of the pulverized coal outlet nozzle is ensured.
Preferably, the start-up burner comprises a burner outer shell and a burner inner channel shell, the burner inner channel shell and the burner outer shell are fixedly connected through a flange, a mixed fuel cavity is arranged at the bottom of the burner outer shell, and the mixed fuel cavity is communicated with the burner inner channel shell;
a fuel inlet and a high-difficulty organic wastewater inlet are symmetrically arranged at the position close to the upper part of the middle part of the burner outer shell, and an oxygen inlet is arranged at the middle part of the burner outer shell; the burner inner channel shell comprises a fuel channel, a high-difficulty organic wastewater channel and an oxygen channel which are sequentially arranged from inside to outside, wherein a fuel inlet is communicated with the fuel channel, an oxygen inlet is communicated with the oxygen channel, and a high-difficulty organic wastewater inlet is communicated with the high-difficulty organic wastewater channel; the high-difficulty organic wastewater fuel channel atomization swirler is arranged at the communication position of the high-difficulty organic wastewater channel and the fuel channel, and the fuel and high-difficulty organic wastewater atomization swirler is arranged at the communication position of the fuel channel and the mixed fuel cavity; the side wall of the bottom of the oxygen channel is provided with an oxygen spray hole, and the mixed fuel cavity is communicated with the oxygen channel through the oxygen spray hole.
Preferably, the included angle between the high-difficulty organic wastewater fuel channel atomizing swirler and the vertical direction is 15-45 degrees, and the included angle between the high-difficulty organic wastewater fuel channel atomizing swirler and the horizontal direction is 15-30 degrees.
Preferably, the included angle between the fuel and the high-difficulty organic wastewater atomization swirler in the vertical direction is 15-30 degrees, and the included angle between the fuel and the high-difficulty organic wastewater atomization swirler in the horizontal direction is 15-30 degrees.
Preferably, the oxygen spray holes comprise an outer ring oxygen spray hole and an inner ring oxygen spray hole, the outer ring oxygen spray hole and the inner ring oxygen spray hole are respectively provided with a plurality of oxygen spray holes, the plurality of outer ring oxygen spray holes and the plurality of inner ring oxygen spray holes are respectively distributed along the side wall of the mixed fuel cavity in a circumferential manner, and the outer ring oxygen spray hole and the inner ring oxygen spray hole respectively form an included angle of 15-45 degrees with the vertical direction.
Preferably, a flame detector is arranged at the top end of the burner outer shell, a flame gun channel inlet is arranged at the upper part of the burner outer shell, a flame gun channel and a flame detector channel are arranged at the inner side of the fuel channel, and a flame gun is arranged at the bottom of the flame gun channel; the flame detector and the flame detector channel form a detection channel, and the inlet of the flame gun channel, the flame gun channel and the flame gun form a flame channel;
a cooling water inlet and a cooling water outlet are arranged at the position below the middle part of the burner outer shell; and a cooling water inlet channel is arranged on the outer side of the oxygen channel, a cooling water outlet channel communicated with the cooling water inlet channel is arranged on the outer side of the cooling water inlet channel, and the cooling water inlet, the cooling water inlet channel, the cooling water outlet channel and the cooling water outlet form a cooling water channel.
Preferably, the protective gas CO is introduced into the start-up burner together with the fuel line2The premixing is specifically as follows:
after the highly difficult organic wastewater is put into use, CO2The total flow rate is 100Nm3Adjustment of the/h to 50Nm3H, opening a carbon dioxide cut-off valve X10 and a carbon dioxide cut-off valve X11;
after the flow regulating valve F05 for high-pressure carbon dioxide atomization is opened to a preset opening, the carbon dioxide cut-off valve X09 for fuel line purging is closed;
the pressure of the high-difficulty organic wastewater is 1.0-1.2MPa higher than the operating pressure of the top-spraying multi-nozzle gasification furnace; the CO2 pressure is 1.5-2.0MPa higher than the operating pressure of the gasification furnace;
the flow of the high-difficulty organic wastewater is measured by a high-difficulty organic wastewater start-up burner flowmeter F09, and the flow of CO2 is measured by a carbon dioxide start-up burner flowmeter F11, during the period, the flow rate of the high-difficulty organic wastewater and CO for atomization are measured2The flow rate is in a linear relationship as follows:
y＝ax；
wherein y represents CO for atomization2When the flow of the high-difficulty organic wastewater is more than or equal to 2.5t/h, the linear relation of y to ax is available; x represents the flow of high-difficulty organic wastewater and CO for atomization2Flow rate not less than 50Nm3H; the value range of a is 20-22;
after the organic wastewater with high difficulty is put into use, setting CO for atomization for protecting the burner2A minimum flow limit, which is linear with gasifier pressure:
y’＝a’x’；
wherein y' represents the top-spray multi-nozzle gasifier pressure; x' represents CO for atomization2A minimum flow rate; a' is 1.5; CO for atomization2Flow rate not less than 50Nm3The linear relationship of y '═ a' x 'is useful when gasifier pressure y' is > 30 bar.
Preferably, the high-difficulty organic wastewater collides with clean high-pressure nitrogen of an oxygen pipeline of the start-up burner at a discharge outlet of the start-up burner, is mixed and is atomized as follows:
in order to ensure the safety of the oxygen pipeline, the pressure of the clean nitrogen is higher than the operating pressure of the top-spraying multi-nozzle gasification furnace by 1.5-2.0MPa, and the flow of the clean nitrogen is not lower than 200Nm3The flow of the high-difficulty organic wastewater cannot exceed 20 percent of the input amount of the pulverized coal;
in order to ensure the atomization effect, the mass flow ratio of the clean nitrogen to the high-difficulty organic wastewater is 0.07-0.14;
the clean nitrogen of oxygen pipeline sweeps trip valve X04 and keeps normally open, and clean nitrogen trip valve X05 and clean nitrogen trip valve X06 are opened after high difficulty organic waste water drops into, and clean nitrogen gas for the atomizing flow control valve F04 is opened gradually to with high difficulty organic waste water go into to start worker's nozzle flowmeter F09 and drop into cascade control, specific formula is:
Y＝Ax；
wherein Y represents a clean nitrogen gas for atomization; a represents the quality of clean nitrogen and high-difficulty organic wastewaterThe flow rate ratio is in the range of 0.07-0.14; x represents the flow of the high-difficulty organic wastewater; in order to ensure the safety of an oxygen pipeline of a burner at start-up, the minimum flow of clean nitrogen gas is not lower than 200Nm3/h；
After the high-difficulty organic wastewater is fed in, the linear relation between the flow and the feeding range of the pulverized coal of the top-spraying multi-nozzle gasification furnace is as follows:
Y’＝A’x；
wherein Y' represents the input amount of the pulverized coal of the top-spraying multi-nozzle gasification furnace and is obtained by measurement; a 'represents the ratio of the input amount of pulverized coal to the mass flow of the high-difficulty organic wastewater, and the operation efficiency A' of the gasification furnace is ensured to be more than or equal to 5; x is the mass flow of the high-difficulty organic wastewater.
Preferably, when the high-difficulty organic wastewater is ready for stopping burning, the following are concrete:
the high-pressure carbon dioxide purging high-difficulty organic wastewater cut-off valve X17 is opened, the high-difficulty organic wastewater border-entering region cut-off valve X12 is closed, and the high-difficulty organic wastewater return cut-off valve X18 is closed;
opening a flow regulating valve F03 of the high-difficulty organic wastewater entry start-up burner to a pre-opening degree, and after purging for 1 minute, closing a cut-off valve X13 of the high-difficulty organic wastewater entry start-up burner and a cut-off valve X17 of the high-difficulty organic wastewater purged by high-pressure carbon dioxide;
at the moment, the organic wastewater channel is safely high-pressure CO from the fuel side2Purging for protection, simultaneously closing the flow regulating valve F04 for cleaning nitrogen atomization step by step, and closing the cleaning nitrogen cut-off valve X05 and the cleaning nitrogen cut-off valve X06;
the high-difficulty organic wastewater exits the start-up burner, the start-up burner is restored to the state before the high-difficulty organic wastewater is put into use, and the oxygen channel and the fuel channel are protected by the purge gas at the moment.
The method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification has the following advantages:
the method can atomize the high-difficulty organic wastewater into micron-size liquid drops through the start-up burner and then enter the gasification furnace, and the liquid drops of the organic wastewater participate in reaction in the reaction chamber by utilizing the reaction temperature of 1500 ℃ in the top-spraying multi-nozzle gasification furnace, so that the organic wastewater is thoroughly decomposed and converted into the synthetic raw material gas mainly comprising CO and H2, and the treatment capacity and the treatment quality of the high-difficulty organic wastewater are improved;
secondly, the top-spraying multi-nozzle gasification furnace top is uniformly distributed according to the circumference, and the start-up burner is positioned in the center of the top-spraying multi-nozzle gasification furnace top, so that the secondary reaction of the high-difficulty organic wastewater and the pulverized coal and reactants of the pulverized coal nozzle is ensured; meanwhile, the start-up burner can not only realize the heating and boosting operation of the gasification furnace before the pulverized coal burner is put into use, but also realize the stop operation of the start-up burner after the pulverized coal burner is put into use, and can input high-difficulty organic wastewater into the furnace to participate in reaction according to the requirement;
thirdly, the start-up burner can be used for feeding fuel and oxygen according to requirements after the high-concentration organic wastewater stops feeding into the furnace, so that high-pressure online feeding is realized;
and (IV) the bottom of the start-up burner is provided with an inner ring oxygen spray hole and an outer ring oxygen spray hole, and the inner ring oxygen spray hole and the outer ring oxygen spray hole can be designed with different oxygen spray hole numbers and oxygen spray hole angles according to the actual oxygen flow and the clean nitrogen flow, so that the ignition success rate of the start-up burner and the atomization effect of high-difficulty organic wastewater are improved, the high-difficulty organic wastewater exists in micron-sized granularity, and the treatment capacity of the high-difficulty organic wastewater is improved.
The invention has the characteristics of reasonable design, simple structure, easy processing, small volume, convenient use, multiple purposes and the like, thereby having good popularization and use values.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of the top of a top-spray multi-nozzle gasification furnace
FIG. 2 is a schematic structural diagram of a start-up burner;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 4 is a schematic view of the piping structure of the present invention;
FIG. 5 is a schematic diagram showing the relationship between the flow rate of the organic wastewater with high difficulty and the flow rate of CO2 for atomization;
FIG. 6 is a schematic diagram showing the relationship between the minimum flow rate of CO2 for atomization and the pressure of a top-spray multi-nozzle gasifier;
FIG. 7 is a schematic diagram showing the relationship between the flow rate of highly difficult organic wastewater and the minimum flow rate of N2 for atomization;
FIG. 8 is a schematic diagram showing the relationship between the flow rate of the organic wastewater with high difficulty and the maximum flow rate of N2 for atomization.
In the figure: 1. the top-spraying multi-nozzle gasification furnace top comprises a top-spraying multi-nozzle gasification furnace top body 2, a start-up burner 3, a pulverized coal burner 4, a burner outer shell body 5, a burner inner channel shell body 6, a flange 7, a mixed fuel cavity 8, a fuel inlet 9, a high-difficulty organic wastewater inlet 10, an oxygen inlet 11, a fuel channel 12, a high-difficulty organic wastewater channel 13, an oxygen channel 14, a high-difficulty organic wastewater fuel channel atomizing swirler 15, a fuel and high-difficulty organic wastewater atomizing swirler 16, an outer ring oxygen spray hole 17, an inner ring oxygen spray hole 18, a flame detector 19, a flame gun channel inlet 20, a flame gun channel 21, a flame detector channel 22, a flame gun 23, a cooling water inlet 24, a cooling water outlet 25, a cooling water inlet channel 26 and a cooling water outlet channel.
Detailed Description
The method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification according to the present invention is described in detail below with reference to the accompanying drawings and specific examples.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description. And are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
[ pipeline Structure ]
As shown in fig. 4, the piping structure includes a fuel piping, a high-difficulty organic waste water piping, a high-pressure carbon dioxide piping, an oxygen piping, and a clean high-pressure nitrogen piping, as follows:
the fuel pipeline is communicated to a fuel inlet of the start-up burner through a fuel inlet area cut-off valve X07, a fuel inlet start-up burner flowmeter F08, a fuel inlet start-up burner flow regulating valve F02 and a fuel inlet start-up burner cut-off valve X08 in sequence; a branch pipeline from circulation or emptying to a safety position is arranged on the fuel in-operation burner flow regulating valve F02 and the fuel in-operation burner cut-off valve X08, and a fuel in-safety position emptying cut-off valve X16 is arranged on the branch pipeline from circulation or emptying to the safety position;
a high-difficulty organic wastewater out-of-bound region branch pipeline is arranged at the front end of the high-difficulty organic wastewater pipeline, and a high-difficulty organic wastewater return cut-off valve X18 is arranged on the high-difficulty organic wastewater out-of-bound region branch pipeline; the rear end of the high-difficulty organic wastewater pipeline is communicated to a high-difficulty organic wastewater inlet of the start-up burner through a high-difficulty organic wastewater inlet boundary zone cut-off valve X12, a high-difficulty organic wastewater inlet start-up burner flowmeter F09, a high-difficulty organic wastewater inlet start-up burner flow regulating valve F03 and a high-difficulty organic wastewater inlet start-up burner cut-off valve X13 in sequence;
the front end of the high-pressure carbon dioxide pipeline is communicated with the front end of the high-difficulty organic wastewater pipeline through a high-pressure carbon dioxide purging high-difficulty organic wastewater cut-off valve X17; the rear end of the high-pressure carbon dioxide pipeline is communicated with the rear end of the fuel pipeline through a carbon dioxide start-up burner flowmeter F11 and a carbon dioxide cut-off valve X09 for purging the fuel pipeline, and premixing treatment is carried out; the carbon dioxide cut-off valve X09 for purging the fuel pipeline is provided with a carbon dioxide cut-off valve X10, a flow regulating valve F05 for atomizing high-pressure carbon dioxide and a carbon dioxide cut-off valve X11 in parallel;
the oxygen pipeline is communicated to an oxygen inlet of the start-up burner sequentially through an oxygen boundary region cut-off valve X01, an oxygen boundary region flow meter F06, an oxygen start-up burner flow regulating valve F01, an oxygen cut-off valve X02, an oxygen start-up burner flow meter F07 and an oxygen start-up burner cut-off valve X03; an emptying-to-atmosphere branch pipeline is arranged at the middle section of the oxygen pipeline, an oxygen inlet boundary area rear emptying valve X14 and an oxygen inlet start-up burner front emptying valve X15 are arranged on the emptying-to-atmosphere branch pipeline, and an oxygen inlet boundary area rear emptying valve X14 is positioned between an oxygen inlet start-up burner flow regulating valve F01 and an oxygen cut-off valve X02; the oxygen inlet start-up burner front emptying valve X15 is positioned between the oxygen cut-off valve X02 and the oxygen inlet start-up burner flow meter F07;
the clean high-pressure nitrogen pipeline is communicated to the oxygen channel through a high-difficulty organic wastewater start-up burner flowmeter F10 and an oxygen pipeline clean nitrogen purging cut-off valve X04 in sequence; or the clean high-pressure nitrogen pipeline sequentially passes through a high-difficulty organic wastewater start-up burner flowmeter F10, a clean nitrogen cut-off valve X05, a clean nitrogen cut-off valve X06 and a flow regulating valve F04 for cleaning nitrogen atomization.
(Top-spraying multi-nozzle gasification furnace structure)
As shown in the attached drawing 1, taking three nozzles as an example, the start-up burner 2 is located at the center of the top-spraying multi-nozzle gasification furnace 1, and the three pulverized coal burners 3 are circumferentially distributed on the top of the top-spraying multi-nozzle gasification furnace 1 with the start-up burner 2 as the center of circle, so that the reaction flow field in the furnace is uniform, and secondary reaction between the high-difficulty organic wastewater and the pulverized coal and reactants of the pulverized coal outlet nozzle 3 is ensured.
As shown in fig. 2 and 3, the start-up burner 2 in this embodiment includes a burner outer shell 4 and a burner inner channel shell 5, the burner inner channel shell 5 and the burner outer shell 4 are fixedly connected through a flange 6, a mixed fuel cavity 7 is arranged at the bottom of the burner outer shell 4, and the mixed fuel cavity 7 is communicated with the burner inner channel shell 5; a fuel inlet 8 and a high-difficulty organic wastewater inlet 9 are symmetrically formed in the position close to the upper middle part of the burner outer shell 4, and an oxygen inlet 10 is formed in the middle part of the burner outer shell 4; the burner inner channel shell 5 comprises a fuel channel 11, a high-difficulty organic wastewater channel 12 and an oxygen channel 13 which are sequentially arranged from inside to outside, a fuel inlet 8 is communicated with the fuel channel 11, an oxygen inlet 10 is communicated with the oxygen channel 13, and a high-difficulty organic wastewater inlet 9 is communicated with the high-difficulty organic wastewater channel 12; the high-difficulty organic wastewater fuel channel atomizing swirler 14 is installed at the communication position of the high-difficulty organic wastewater channel 12 and the fuel channel 11, the included angle between the high-difficulty organic wastewater fuel channel atomizing swirler 14 and the vertical direction is 30 degrees, and the included angle between the high-difficulty organic wastewater fuel channel atomizing swirler 14 and the horizontal direction is 15 degrees. A fuel and high-difficulty organic wastewater atomization swirler 15 is arranged at the position where the fuel channel 11 is communicated with the mixed fuel cavity 7; the included angle between the fuel and the high-difficulty organic wastewater atomization swirler 15 in the vertical direction is 15 degrees, and the included angle between the fuel and the high-difficulty organic wastewater atomization swirler 15 in the horizontal direction is 30 degrees. An oxygen spraying hole is formed in the side wall of the bottom of the oxygen channel 13, and the mixed fuel cavity 7 is communicated with the oxygen channel 13 through the oxygen spraying hole. The oxygen spray holes comprise an outer ring oxygen spray hole 16 and an inner ring oxygen spray hole 17, the outer ring oxygen spray hole 16 and the inner ring oxygen spray hole 17 are respectively provided with a plurality of oxygen spray holes, the plurality of outer ring oxygen spray holes 16 and the plurality of inner ring oxygen spray holes 17 are respectively distributed along the side wall of the mixed fuel cavity 7 in a circumferential manner, and the outer ring oxygen spray hole 16 and the inner ring oxygen spray holes 17 respectively form 30-degree included angles with the vertical direction. A flame detector 18 is installed at the top end of the burner outer shell 4, a flame gun channel inlet 19 is arranged at the upper part of the burner outer shell 4, a flame gun channel 20 and a flame detector channel 21 are arranged at the inner side of the fuel channel 11, and a flame gun 22 is installed at the bottom of the flame gun channel 20; the flame detector 18 and the flame detector channel 21 constitute a detection channel, and the entrance 19 of the flame gun channel, the channel 20 of the flame gun and the channel 22 of the flame gun constitute a flame channel.
The fuel channel 11 and the high-difficulty organic wastewater channel 12 are premixed through a high-difficulty organic wastewater fuel channel atomizer 14, then mixed with the oxygen channel 13 through a fuel and high-difficulty organic wastewater atomization swirler 15 in a mixed fuel cavity 5, and finally combusted through a fire gun channel 20 and a flame detector channel 21.
In the embodiment, a cooling water inlet 23 and a cooling water outlet 24 are formed in the position, close to the middle part of the burner outer shell 4, of the burner outer shell; a cooling water inlet channel 25 is arranged on the outer side of the oxygen channel 13, a cooling water outlet channel 26 communicated with the cooling water inlet channel 25 is arranged on the outer side of the cooling water inlet 23, and the cooling water inlet 23, the cooling water inlet channel 25, the cooling water outlet channel 26 and the cooling water outlet 24 form a cooling water channel.
Method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification
The method of the invention is concretely as follows:
s1, after the pulverized coal burner is put into the operation burner and the fuel and oxygen of the operation burner are normally stopped to be supplied, the high-difficulty organic wastewater is led into the operation burner through the high-difficulty organic wastewater inlet, and CO and fuel pipeline protective gas are introduced into the operation burner2After premixing, discharging from a start-up burner;
s2, colliding, mixing and atomizing the high-difficulty organic wastewater with clean high-pressure nitrogen of an oxygen pipeline of the start-up burner at a discharge port of the start-up burner;
s3, atomizing the high-difficulty organic wastewater by a start-up burner, and reacting in a top-spraying multi-nozzle gasification furnace to generate CO and H2Mainly used as raw material gas.
In the embodiment, S1 is in the start-up burner and the fuel line protective gas CO2The premixing is specifically as follows:
s101, after the high-difficulty organic wastewater is put into the reactor, CO2The total flow rate is 100Nm3Adjustment of the/h to 50Nm3H, opening a carbon dioxide cut-off valve X10 and a carbon dioxide cut-off valve X11;
s102, after the flow regulating valve F05 for high-pressure carbon dioxide atomization is opened to a preset opening, the carbon dioxide cut-off valve X09 for fuel line purging is closed;
s103, the pressure of the high-difficulty organic wastewater is 1.0-1.2MPa higher than the operating pressure of the top-spraying multi-nozzle gasification furnace; the CO2 pressure is 1.5-2.0MPa higher than the operating pressure of the gasification furnace;
s104, measuring the flow of the high-difficulty organic wastewater by using a high-difficulty organic wastewater start-up burner flowmeter F09, measuring the flow of CO2 by using a carbon dioxide start-up burner flowmeter F11, and measuring the flow of the high-difficulty organic wastewater in the periodCO for flow and atomization of organic wastewater2The flow rate is in a linear relationship as follows:
y＝ax；
wherein y represents CO for atomization2When the flow rate y of the high-difficulty organic wastewater is more than or equal to 2.5t/h, the linear relation of y to ax can be used, as shown in the attached figure 5; x represents the flow of high-difficulty organic wastewater and CO for atomization2Flow rate not less than 50Nm3H; the value range of a is 20-22.
S105, after the high-difficulty organic wastewater is put into use, setting CO for atomization for protecting the burner2A minimum flow limit, which is linear with gasifier pressure:
y’＝a’x’；
wherein y' represents the top-spray multi-nozzle gasifier pressure; x' represents CO for atomization2A minimum flow rate; a' is 1.5; CO for atomization2Flow rate not less than 50Nm3The linear relationship of y '═ a' x 'is useful when gasifier pressure y' is > 30bar, as shown in FIG. 6.
In this embodiment, the collision, mixing and atomization of the high-difficulty organic wastewater in step S2 with the clean high-pressure nitrogen in the oxygen pipeline of the start-up burner at the discharge port of the start-up burner are specifically as follows:
s201, in order to ensure the safety of an oxygen pipeline, the pressure of clean nitrogen is higher than the operating pressure of the top-spraying multi-nozzle gasification furnace by 1.5-2.0MPa, and the flow of the clean nitrogen is not lower than 200Nm3The flow of the high-difficulty organic wastewater cannot exceed 20 percent of the input amount of the pulverized coal;
s202, in order to ensure the atomization effect, the mass flow ratio of the clean nitrogen to the high-difficulty organic wastewater is 0.07-0.14;
s203, the oxygen pipeline clean nitrogen purging cut-off valve X04 is kept normally open, the clean nitrogen cut-off valve X05 and the clean nitrogen cut-off valve X06 are opened after the high-difficulty organic wastewater is put into operation, the flow regulating valve F04 for clean nitrogen atomization is gradually opened, and the clean nitrogen purging cut-off valve and the high-difficulty organic wastewater are put into operation in a burner flow meter F09 and are subjected to cascade control, and the specific formula is as follows:
Y＝Ax；
wherein Y represents a clean nitrogen gas for atomization; a. theThe mass flow ratio of clean nitrogen to high-difficulty organic wastewater is expressed, and the value range is 0.07-0.14; x represents the flow of the high-difficulty organic wastewater; in order to ensure the safety of an oxygen pipeline of a burner at start-up, the minimum flow of clean nitrogen gas is not lower than 200Nm3H, as shown in FIGS. 7 and 8;
s204, after the high-difficulty organic wastewater is fed in at a flow rate, the linear relation between the flow rate and the pulverized coal feeding range of the top-spraying multi-nozzle gasification furnace is as follows:
Y’＝A’x；
wherein Y' represents the input amount of the pulverized coal of the top-spraying multi-nozzle gasification furnace and is obtained by measurement; a 'represents the ratio of the input amount of pulverized coal to the mass flow of the high-difficulty organic wastewater, and the operation efficiency A' of the gasification furnace is ensured to be more than or equal to 5; x is the mass flow of the high-difficulty organic wastewater.
After step S3 is completed in this embodiment, when the highly difficult organic wastewater is ready to stop burning, the following steps are specifically performed:
(1) the high-pressure carbon dioxide purging high-difficulty organic wastewater cut-off valve X17 is opened, the high-difficulty organic wastewater border zone cut-off valve X12 is closed, and the high-difficulty organic wastewater return cut-off valve X18 is closed;
(2) opening a flow regulating valve F03 of the high-difficulty organic wastewater entry start-up burner to a pre-opening degree, and after purging for 1 minute, closing a cut-off valve X13 of the high-difficulty organic wastewater entry start-up burner and a cut-off valve X17 of the high-difficulty organic wastewater purged by high-pressure carbon dioxide;
(3) at the moment, the organic wastewater channel is safely high-pressure CO from the fuel side2Purging for protection, simultaneously closing the flow regulating valve F04 for cleaning nitrogen atomization step by step, and closing the cleaning nitrogen cut-off valve X05 and the cleaning nitrogen cut-off valve X06;
(4) and the high-difficulty organic wastewater exits the start-up burner, the start-up burner is restored to the state before the high-difficulty organic wastewater is put into use, and the oxygen channel and the fuel channel are protected by the purge gas at the moment.
At the moment, the high-pressure on-line application of the start-up burner can be realized, and the method specifically comprises the following steps:
calibrating an oxygen flow regulating valve and a fuel gas flow regulating valve according to the relation between the flow of oxygen entering a gasification furnace, the oxygen-fuel ratio and the pressure of the gasification furnace, controlling the distance between the gas of a start-up burner after the oxygen is mixed with a fuel gas outlet burner when the start-up burner is started and put into use and the gas and a burning torch to be 1-2cm, and simultaneously controlling the excess coefficient of the oxygen to be 2.0-3.0 when the initial stage is put into use; the oxygen excess coefficient when the high pressure of the start-up burner is put into the burner is controlled to be 0.8-0.9, so that the ignition success rate is improved and the burner can be started/stopped on line.
The invention effectively improves the treatment capacity and treatment quality of high-difficulty organic wastewater, the input amount of general pulverized coal gasification steam only accounts for 8 percent of the input amount of pulverized coal, and the highest organic wastewater accounts for 13 percent of the input amount of the pulverized coal.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification is characterized by comprising the following steps:
after the pulverized coal burner is put into the burner and the fuel and oxygen of the start-up burner are normally stopped to be supplied, the high-difficulty organic wastewater is introduced into the start-up burner through the high-difficulty organic wastewater inlet, and CO and fuel pipeline shielding gas are introduced into the start-up burner2After premixing, discharging from a start-up burner;
the high-difficulty organic wastewater collides, is mixed and is atomized with clean high-pressure nitrogen of an oxygen pipeline of the start-up burner at a discharge port of the start-up burner;
after the high-difficulty organic wastewater is atomized by the start-up burner, the high-difficulty organic wastewater participates in the reaction in the top-spraying multi-nozzle gasification furnace to generate CO and H2Mainly used as raw material gas.
2. The method for treating high difficulty organic wastewater by utilizing multi-nozzle pulverized coal gasification as claimed in claim 1, wherein the start-up burner is located at the center of the top-spray multi-nozzle gasification furnace, and the pulverized coal burners are circumferentially distributed on the top of the top-spray multi-nozzle gasification furnace with the start-up burner as a circle center.
3. The method for treating high-difficulty organic wastewater by gasifying multi-nozzle pulverized coal as claimed in claim 1, wherein the start-up burner comprises a burner outer shell and a burner inner channel shell, the burner inner channel shell and the burner outer shell are fixedly connected through a flange, a mixed fuel cavity is arranged at the bottom of the burner outer shell, and the mixed fuel cavity is communicated with the burner inner channel shell;
a fuel inlet and a high-difficulty organic wastewater inlet are symmetrically arranged at the position close to the upper part of the middle part of the burner outer shell, and an oxygen inlet is arranged at the middle part of the burner outer shell; the burner inner channel shell comprises a fuel channel, a high-difficulty organic wastewater channel and an oxygen channel which are sequentially arranged from inside to outside, wherein a fuel inlet is communicated with the fuel channel, an oxygen inlet is communicated with the oxygen channel, and a high-difficulty organic wastewater inlet is communicated with the high-difficulty organic wastewater channel; the high-difficulty organic wastewater fuel channel atomization swirler is arranged at the communication position of the high-difficulty organic wastewater channel and the fuel channel, and the fuel and high-difficulty organic wastewater atomization swirler is arranged at the communication position of the fuel channel and the mixed fuel cavity; the side wall of the bottom of the oxygen channel is provided with an oxygen spray hole, and the mixed fuel cavity is communicated with the oxygen channel through the oxygen spray hole.
4. The method for treating high difficulty organic wastewater by using multi-nozzle pulverized coal gasification as claimed in claim 3, wherein the included angle between the high difficulty organic wastewater fuel channel atomizing cyclone and the vertical direction is 15-45 °, and the included angle between the high difficulty organic wastewater fuel channel atomizing cyclone and the horizontal direction is 15-30 °.
5. The method for treating high difficulty organic wastewater by using multi-nozzle pulverized coal gasification as claimed in claim 3, wherein the included angle between the fuel and high difficulty organic wastewater atomization cyclone in the vertical direction is 15-30 °, and the included angle between the fuel and high difficulty organic wastewater atomization cyclone in the horizontal direction is 15-30 °.
6. The method according to claim 3, wherein the oxygen injection holes comprise an outer ring oxygen injection hole and an inner ring oxygen injection hole, the outer ring oxygen injection hole and the inner ring oxygen injection hole are respectively provided in a plurality, the plurality of outer ring oxygen injection holes and the plurality of inner ring oxygen injection holes are respectively circumferentially distributed along the sidewall of the mixed fuel cavity, and the outer ring oxygen injection hole and the inner ring oxygen injection hole are respectively formed at an angle of 15-45 degrees with the vertical direction.
7. The method for treating high-difficulty organic wastewater by gasifying multi-nozzle pulverized coal as claimed in claim 3, wherein a flame detector is arranged at the top end of the burner outer shell, a channel inlet of a fire gun is arranged at the upper part of the burner outer shell, a channel of the fire gun and a channel of the flame detector are arranged at the inner side of the fuel channel, and the fire gun is arranged at the bottom of the channel of the fire gun; the flame detector and the flame detector channel form a detection channel, and the inlet of the flame gun channel, the flame gun channel and the flame gun form a flame channel;
a cooling water inlet and a cooling water outlet are arranged at the position below the middle part of the burner outer shell; and a cooling water inlet channel is arranged on the outer side of the oxygen channel, a cooling water outlet channel communicated with the cooling water inlet channel is arranged on the outer side of the cooling water inlet channel, and the cooling water inlet, the cooling water inlet channel, the cooling water outlet channel and the cooling water outlet form a cooling water channel.
8. The method of claim 1, wherein the CO protective gas is introduced into the start-up burner and the fuel line2The premixing is specifically as follows:
after the high-difficulty organic wastewater is put into，CO2The total flow rate is 100Nm3Adjustment of the/h to 50Nm3H, opening a carbon dioxide cut-off valve X10 and a carbon dioxide cut-off valve X11;
after the flow regulating valve F05 for high-pressure carbon dioxide atomization is opened to a preset opening, the carbon dioxide cut-off valve X09 for fuel line purging is closed;
the pressure of the high-difficulty organic wastewater is 1.0-1.2MPa higher than the operating pressure of the top-spraying multi-nozzle gasification furnace; the CO2 pressure is 1.5-2.0MPa higher than the operating pressure of the gasification furnace;
the flow rate of the high-difficulty organic wastewater is measured by a high-difficulty organic wastewater start-up burner flowmeter F09, the flow rate of CO2 is measured by a carbon dioxide start-up burner flowmeter F11, and the flow rate of the high-difficulty organic wastewater and CO for atomization in the period2The flow rate is in a linear relationship as follows:
y＝ax；
wherein y represents CO for atomization2When the flow of the high-difficulty organic wastewater is more than or equal to 2.5t/h, the linear relation of y to ax is available; x represents the flow of high-difficulty organic wastewater and CO for atomization2Flow rate not less than 50Nm3H; the value range of a is 20-22;
after the organic wastewater with high difficulty is put into use, setting CO for atomization2A minimum flow limit, which is linear with gasifier pressure:
y’＝a’x’；
wherein y' represents the top-spray multi-nozzle gasifier pressure; x' represents CO for atomization2A minimum flow rate; a' is 1.5; CO for atomization2Flow rate not less than 50Nm3The linear relationship of y '═ a' x 'is useful when gasifier pressure y' is > 30 bar.
9. The method for treating high difficulty organic wastewater by using multi-nozzle pulverized coal gasification as claimed in claim 1, wherein the high difficulty organic wastewater collides, mixes and atomizes with clean high pressure nitrogen of a start-up burner oxygen pipeline at a start-up burner discharge port as follows:
the pressure of the clean nitrogen is 1.5-2.0MPa higher than the operating pressure of the top-spraying multi-nozzle gasification furnace, and the clean nitrogenMust not be less than 200Nm3The flow of the high-difficulty organic wastewater cannot exceed 20 percent of the input amount of the pulverized coal;
the mass flow ratio of the clean nitrogen to the high-difficulty organic wastewater is 0.07-0.14;
the clean nitrogen of oxygen pipeline sweeps trip valve X04 and keeps normally open, and clean nitrogen trip valve X05 and clean nitrogen trip valve X06 are opened after high difficulty organic waste water drops into, and clean nitrogen gas for the atomizing flow control valve F04 is opened gradually to with high difficulty organic waste water go into to start worker's nozzle flowmeter F09 and drop into cascade control, specific formula is:
Y＝Ax；
wherein Y represents a clean nitrogen gas for atomization; a represents the mass flow ratio of clean nitrogen to high-difficulty organic wastewater, and the value range is 0.07-0.14; x represents the flow of the high-difficulty organic wastewater; the flow of clean nitrogen must not be lower than 200Nm at minimum3/h；
After the high-difficulty organic wastewater is fed in, the linear relation between the flow and the feeding range of the pulverized coal of the top-spraying multi-nozzle gasification furnace is as follows:
Y’＝A’x；
wherein Y' represents the input amount of the pulverized coal of the top-spraying multi-nozzle gasification furnace and is obtained by measurement; a 'represents the ratio of the input amount of pulverized coal to the mass flow of the high-difficulty organic wastewater, and A' is more than or equal to 5; x is the mass flow of the high-difficulty organic wastewater.
10. The method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification according to claim 1, wherein when the high-difficulty organic wastewater is ready to stop burning, the method comprises the following steps:
the high-pressure carbon dioxide purging high-difficulty organic wastewater cut-off valve X17 is opened, the high-difficulty organic wastewater border-entering region cut-off valve X12 is closed, and the high-difficulty organic wastewater return cut-off valve X18 is closed;
opening a flow regulating valve F03 of the high-difficulty organic wastewater entry start-up burner to a pre-opening degree, and after purging for 1 minute, closing a cut-off valve X13 of the high-difficulty organic wastewater entry start-up burner and a cut-off valve X17 of the high-difficulty organic wastewater purged by high-pressure carbon dioxide;
at the moment, the organic wastewater channel is safeFuel side high pressure CO2Purging for protection, simultaneously closing the flow regulating valve F04 for cleaning nitrogen atomization step by step, and closing the cleaning nitrogen cut-off valve X05 and the cleaning nitrogen cut-off valve X06;
the high-difficulty organic wastewater exits the start-up burner, the start-up burner is restored to the state before the high-difficulty organic wastewater is put into use, and the oxygen channel and the fuel channel are protected by the purge gas at the moment.
CN202110306536.6A 2021-03-23 2021-03-23 Method for treating high-difficulty organic wastewater by using multi-nozzle pulverized coal gasification Active CN113061470B (en)

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Publication number Priority date Publication date Assignee Title
JP2007103125A (en) * 2005-10-03 2007-04-19 Univ Nagoya Gas supply system for fuel cell, and fuel cell power generation system using it
CN208964866U (en) * 2018-05-30 2019-06-11 科林未来能源技术(北京)有限公司 It is a kind of cooperation-gasified can dispose waste liquid, the gasification system of slurry and coal dust
CN110669555A (en) * 2019-10-28 2020-01-10 中国华能集团清洁能源技术研究院有限公司 Multifunctional integrated start-up burner
CN111647438A (en) * 2020-06-04 2020-09-11 北京清创晋华科技有限公司 Coal water slurry gasification waste water blending combustion system
CN112480971A (en) * 2020-10-28 2021-03-12 中石化宁波工程有限公司 Control method of pulverized coal gasification process for co-combustion of high-concentration organic waste liquid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007103125A (en) * 2005-10-03 2007-04-19 Univ Nagoya Gas supply system for fuel cell, and fuel cell power generation system using it
CN208964866U (en) * 2018-05-30 2019-06-11 科林未来能源技术(北京)有限公司 It is a kind of cooperation-gasified can dispose waste liquid, the gasification system of slurry and coal dust
CN110669555A (en) * 2019-10-28 2020-01-10 中国华能集团清洁能源技术研究院有限公司 Multifunctional integrated start-up burner
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