CN111018216A - Treatment process and treatment device for residual ammonia water - Google Patents
Treatment process and treatment device for residual ammonia water Download PDFInfo
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- CN111018216A CN111018216A CN201911170616.2A CN201911170616A CN111018216A CN 111018216 A CN111018216 A CN 111018216A CN 201911170616 A CN201911170616 A CN 201911170616A CN 111018216 A CN111018216 A CN 111018216A
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- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
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- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C02F1/025—Thermal hydrolysis
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- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2001/007—Processes including a sedimentation step
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
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Abstract
The invention provides a treatment process of residual ammonia water, which comprises the following steps of firstly, obtaining ammonia water and tar from raw coke oven gas generated in a composite furnace; step two, performing primary sedimentation on ammonia water to obtain primary ammonia water; thirdly, performing secondary sedimentation on the primary ammonia water to obtain secondary ammonia water; step four, conveying secondary ammonia water to the top of the composite furnace for dry distillation treatment; and conveying the secondary ammonia water to a high-temperature region of a carbonization chamber of the composite furnace for gasification treatment. Still provide the processing apparatus of surplus aqueous ammonia, including aqueous ammonia processing apparatus, aqueous ammonia processing apparatus includes aqueous ammonia preprocessor, aqueous ammonia preprocessor and aqueous ammonia treater intercommunication, and the aqueous ammonia treater is connected with first pipeline and second pipeline through the trunk line. A plurality of spiral spray heads are arranged on the first pipelines positioned at the tops of the plurality of composite furnaces. A plurality of special nozzles are arranged on the second pipelines positioned in the high-temperature areas of the carbonization chambers of the compound furnaces. The residual ammonia water treatment process and the device thereof have the advantages of simple structure, convenient construction, energy conservation, environmental protection, safety and reliability.
Description
Technical Field
The invention relates to the technical field of coking wastewater treatment, in particular to a treatment process and a treatment device for residual ammonia water.
Background
A large amount of ammonia water is formed in the primary cooling process of the coke oven gas, wherein part of the ammonia water is used for circulation and is called as circulating ammonia water, and the redundant ammonia water is discharged outside and is called as residual ammonia water. The residual ammonia water contains harmful impurities such as coal distilled oil, phenol, ammonia, hydrogen cyanide, hydrogen sulfide and the like and a small amount of germanium-containing compounds, and is a main source of coking industrial sewage.
In recent years, with the rapid development of national economy of China, the coke yield is greatly increased, and the amount of residual ammonia water is increased. With the continuous strict environmental protection requirements, the national and local environmental protection departments have policies and regulations related to the zero discharge of wastewater of production enterprises, so that the coking enterprises need to recover and treat a large amount of generated residual ammonia water, thereby reducing the environmental protection pressure of the coking enterprises.
At present, the treatment of the residual ammonia water generally adopts a steam ammonia distillation method in an ammonia distillation system, wherein the steam ammonia distillation method takes steam as a carrier, and transfers ammonia nitrogen dissolved in water into the steam by a distillation method, thereby achieving the purpose of removing the ammonia nitrogen. The ammonia still is used as traditional and mature ammonia still equipment and is widely applied to the residual ammonia water treatment process, but the ammonia still has the ammonia still efficiency which is easily affected by various factors and has the defects of complex operation, large water vapor consumption, large equipment investment and the like.
Disclosure of Invention
The invention aims to solve the problems of complex operation, large water vapor consumption and the like of an ammonia distillation system for treating residual ammonia water in the prior art, and provides a treatment process and a treatment device for the residual ammonia water. After the residual ammonia water is treated by the treatment process, the aims of zero discharge of waste water, energy conservation and environmental protection can be achieved, and the treatment of the residual ammonia water is low in cost, safe and reliable.
The technical scheme for realizing the purpose of the invention is as follows: a treatment process of residual ammonia water comprises the following steps:
step one, raw coke oven gas generated in a composite furnace is sequentially washed, cooled and separated to obtain ammonia water and tar, and the ammonia water is collected into an ammonia water storage tank;
secondly, sending ammonia water into an ammonia water preprocessor through an ammonia water main water supply pipe for primary sedimentation treatment, separating to obtain primary oil stain and primary ammonia water, conveying the primary oil stain to an ammonia water main water return pipe and discharging, and conveying the primary ammonia water into an ammonia water treatment device through a pipeline;
step three, carrying out secondary sedimentation treatment on the primary ammonia water in an ammonia water treatment device, separating to obtain secondary oil stain and secondary ammonia water, conveying the secondary oil stain to an ammonia water main return pipe and discharging, and discharging and temporarily storing the secondary ammonia water through a pipeline;
conveying part of secondary ammonia water to the top of the composite furnace through a pipeline for dry distillation treatment; and conveying the other part of secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline for gasification treatment, and discharging the raw gas generated in the composite furnace into a subsequent ammonia water process for treatment.
After the residual ammonia water produced by coking enterprises is subjected to sedimentation treatment, the obtained secondary ammonia water is sprayed into the furnace top of the composite furnace or the high-temperature area of the carbonization chamber for recycling, so that the emptying rate and the discharge rate of the residual ammonia water are reduced, the effective components of the raw coke oven gas can be increased, the auxiliary control of the temperature of the furnace top of the composite furnace is facilitated, and the purposes of energy conservation, environmental protection, safety and reliability in production are achieved.
In a preferred embodiment of the process for treating residual ammonia water of the present invention, in the fourth step, the secondary ammonia water dry distillation treatment method comprises: the secondary ammonia water is pressurized by a pressurizing water pump, is conveyed to the top of the pump composite furnace through a pipeline, is sprayed onto the coal blocks in the top of the furnace through a spiral spray head, and is subjected to dry distillation treatment. The secondary ammonia water is sprayed onto the coal blocks through the spiral spray heads, so that the moisture of the coal blocks is increased by 2-6%, and the secondary ammonia water is also favorable for removing gas generated by coal gas, is free of dust, is favorable for controlling the furnace top temperature of the composite furnace, and prevents the furnace top from catching fire and exploding.
In a preferred embodiment of the process for treating residual ammonia water of the present invention, in the fourth step, the secondary ammonia water gasification treatment method comprises: pressurizing the secondary ammonia water by a pressurizing water pump, conveying the secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline, spraying the secondary ammonia water onto the coal blocks through a spray head, and gasifying the secondary ammonia water. The secondary ammonia water is sprayed onto the coal blocks in the high-temperature region of the carbonization chamber of the compound furnace, and the secondary ammonia water is quickly gasified in the furnace, so that the effective components of the gas can be increased, and the moisture of the coal blocks is increased by 2-6%.
Furthermore, the secondary ammonia water is pressurized to 0.1-0.5 Mpa by a pressurizing water pump, and the pressure of the secondary ammonia water is 0.1-0.5 Mpa, so that the angle and the particle size of the secondary ammonia water sprayed by the spiral spray nozzle can be ensured, the dry distillation time is reduced, and the dry distillation effect is improved.
Further, the remaining ammonia (secondary ammonia) contains a large amount of free ammonium (e.g., (NH)4）2CO3、NH4OH, etc.) and fixed ammonium (NH)4Cl、（NH4）2SO3、NH4SCN, etc.), free ammonium can be evaporated out under high temperature, and fixed ammonium can be evaporated out only with the alkali lye transformation free ammonium, consequently, in step four, add alkali lye in spraying the secondary ammonia water of the high temperature region of compound furnace carbonization chamber, make the PH of secondary ammonia water =7.5~8.0, thereby ensure that the fixed ammonium in the secondary ammonia water also can be evaporated out, reduce the volume of the interior fixed ammonium of coal piece, reduce the environmental protection of later stage sewage and waste residue and handleAmount of the compound (A).
The invention also provides a device for treating the residual ammonia water, which is applied to the treatment process of the residual ammonia water and comprises a plurality of composite furnaces, wherein the gas outlet end of each composite furnace is sequentially connected with a gas collecting tank, a first separator, a primary cooling tower, a transverse pipe cooling tower, a second separator and an electric tar precipitator. The upper end liquid outlet of the electrical tar precipitator is connected with the ammonia water storage tank through a gas fan, and the lower end liquid outlet of the electrical tar precipitator is connected with the tar storage tank through a pipeline.
The ammonia water of ammonia water storage jar is always gone up the water pipe exit end and is connected with ammonia water treatment facilities, and ammonia water treatment facilities includes ammonia water preprocessor, and ammonia water preprocessor and ammonia water treater are through the pipeline intercommunication, and the ammonia water treater is connected with first pipeline and second pipeline through the trunk line.
The first pipeline is communicated with the furnace tops of the plurality of composite furnaces, and a plurality of spiral spray heads are arranged on the first pipeline positioned at the furnace tops of the plurality of composite furnaces.
The second pipeline is communicated with the high-temperature area of the plurality of composite furnace carbonization chambers, and a plurality of special nozzles are arranged on the second pipeline in the high-temperature area of the plurality of composite furnace carbonization chambers, and the special nozzles include but are not limited to rotary nozzles, water sprinkling nozzles and sand blasting nozzles.
The ammonia water treatment device with simple structure and convenient construction operation is added on the original device, so that the residual ammonia water (secondary ammonia water) generated at the rear end of the process is recycled.
In a preferred embodiment of the device for treating residual ammonia water of the present invention, the main pipe is further provided with a pressurizing water pump, and the pressurizing water pump is used for pressurizing the secondary ammonia water entering the main pipe, so that the pressure of the secondary ammonia water is 0.1-0.5 Mpa.
In a preferred embodiment of the apparatus for treating residual ammonia water of the present invention, the sewage outlets at the lower ends of the ammonia water preprocessor and the ammonia water treatment device are connected to the total ammonia water return pipe for discharging the oil stains in the ammonia water preprocessing and the ammonia water treatment device.
In a preferred embodiment of the apparatus for treating residual ammonia water according to the present invention, in order to facilitate the control of the pressure of the secondary ammonia water in the main pipe and the control of the amount of the secondary ammonia water flowing into the furnace top of the compound furnace through the first pipe and the high temperature zone of the carbonization chamber of the compound furnace through the second pipe, the first pipe and the second pipe are respectively provided with an electromagnetic flow valve and a regulating valve, and the main pipe is provided with a pressure valve.
Compared with the prior art, the beneficial effects of the invention are as follows:
1. the residual ammonia water generated by the coking enterprises is reused in the composite furnace through the treatment process and the treatment device, so that an ammonia distillation system is replaced, the industrial residual ammonia water is zero-discharged, and the environmental protection pressure of the enterprises is reduced.
2. The residual ammonia water (secondary ammonia water) is recycled at the furnace top of the composite furnace and the high-temperature area of the carbonization chamber, so that the effective components in the raw coke oven gas can be increased; on the other hand, the residual ammonia water (secondary ammonia water) is sprayed on the coal blocks in the high-temperature area of the carbonization chamber, so that the water can be supplemented to the coal blocks to keep the coal blocks at the humidity, the external water quantity is reduced, and the production cost is effectively controlled; and finally, the residual ammonia water (secondary ammonia water) is sprayed on the coal block in the furnace top of the composite furnace, which is also beneficial to removing the dirt in the raw gas, controlling the temperature of the furnace top and preventing the furnace top from igniting and exploding.
3. Through preliminary calculation, about 80t of secondary ammonia water can be processed at the top of each composite furnace every day, about 3.334t of secondary ammonia water can be processed in the high-temperature region of the carbonization chamber of each composite furnace every day, the treatment capacity of residual ammonia water (secondary ammonia water) sewage is greatly reduced, and the heat energy of an ammonia distillation system and the cost of equipment are reduced.
Drawings
FIG. 1 is a flow chart of the process for treating residual aqueous ammonia according to the present invention;
FIG. 2 is a schematic view of a residual ammonia water treatment apparatus according to the present invention;
FIG. 3 is an enlarged view of the ammonia water treatment apparatus at A in FIG. 2;
wherein, 1, a composite furnace; 2. a gas collecting tank; 3. a first separator; 4. a primary cooling tower; 5. a horizontal tube cooling tower; 6. a second separator; 7. an electrical tar precipitator; 8. a gas fan; 9. an ammonia water storage tank; 10. a tar storage tank; 11. an ammonia water treatment device; 110. an ammonia water preprocessor; 111. an ammonia water processor; 112. a main pipeline; 113. a first conduit; 114. a second conduit; 115. rotating the spray head; 116. a special nozzle; 117. a pressurized water pump; 118. an electromagnetic flow valve; 119. adjusting a valve; 120. a pressure valve.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; 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 meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1:
referring to fig. 1, fig. 1 is a flow chart of the treatment process of the residual ammonia water of the present invention, and the treatment process of the residual ammonia water includes the following steps:
step one, raw coke oven gas generated in a composite furnace is sequentially washed, cooled and separated to obtain ammonia water and tar, the ammonia water is collected into an ammonia water storage tank, and the tar is pumped into a tar tank through a high-pressure pump to be stored;
secondly, sending ammonia water into an ammonia water preprocessor through an ammonia water main water supply pipe for primary sedimentation treatment, separating to obtain primary oil stain and primary ammonia water, conveying the primary oil stain to an ammonia water main water return pipe and discharging, and conveying the primary ammonia water into an ammonia water treatment device through a pipeline;
step three, carrying out secondary sedimentation treatment on the primary ammonia water in an ammonia water treatment device, separating to obtain secondary oil stain and secondary ammonia water, conveying the secondary oil stain to an ammonia water main return pipe and discharging, and discharging and temporarily storing the secondary ammonia water through a pipeline;
conveying part of secondary ammonia water to the top of the composite furnace through a pipeline for dry distillation treatment; and conveying the other part of secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline for gasification treatment, and discharging the raw gas generated in the composite furnace into a subsequent ammonia water process for treatment.
In the fourth step, the secondary ammonia water gasification treatment method comprises the following steps: pressurizing the secondary ammonia water by a pressurizing water pump, conveying the secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline, spraying the secondary ammonia water onto the coal blocks through a spray head, and gasifying the secondary ammonia water. The secondary ammonia water is sprayed onto the coal blocks in the high-temperature region of the carbonization chamber of the compound furnace, and the secondary ammonia water is quickly gasified in the furnace, so that the effective components of the gas can be increased, and the moisture of the coal blocks is increased by 2-6%. The secondary ammonia water dry distillation treatment method comprises the following steps: the secondary ammonia water is pressurized by a pressurizing water pump, is conveyed to the top of the pump composite furnace through a pipeline, is sprayed onto the coal blocks in the top of the furnace through a spiral spray head, and is subjected to dry distillation treatment. The secondary ammonia water is sprayed onto the coal blocks through the spiral spray heads, so that the moisture of the coal blocks is increased by 2-6%, and the secondary ammonia water is also favorable for removing gas generated by coal gas, is free of dust, is favorable for controlling the furnace top temperature of the composite furnace, and prevents the furnace top from catching fire and exploding.
Example 2:
as shown in fig. 1, in this embodiment, for further optimizing embodiment 1, the treatment process of the residual ammonia water includes the following steps:
step one, raw coke oven gas generated in a composite furnace is sequentially washed, cooled and separated to obtain ammonia water and tar, the ammonia water is collected into an ammonia water storage tank, and the tar is pumped into a tar tank by a high-pressure pump to be stored;
secondly, sending ammonia water into an ammonia water preprocessor through an ammonia water main water supply pipe for primary sedimentation treatment, separating to obtain primary oil stain and primary ammonia water, conveying the primary oil stain to an ammonia water main water return pipe and discharging, and conveying the primary ammonia water into an ammonia water treatment device through a pipeline;
step three, carrying out secondary sedimentation treatment on the primary ammonia water in an ammonia water treatment device, separating to obtain secondary oil stain and secondary ammonia water, conveying the secondary oil stain to an ammonia water main return pipe and discharging, and discharging and temporarily storing the secondary ammonia water through a pipeline;
conveying part of secondary ammonia water to the top of the composite furnace through a pipeline for dry distillation treatment; and conveying the other part of secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline for gasification treatment, and discharging the raw gas generated in the composite furnace into a subsequent ammonia water process for treatment. The secondary ammonia water gasification treatment method comprises the following steps: pressurizing the secondary ammonia water by a pressurizing water pump, conveying the secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline, spraying the secondary ammonia water onto the coal blocks through a spray head, and gasifying the secondary ammonia water. The secondary ammonia water is sprayed onto the coal blocks in the high-temperature region of the carbonization chamber of the compound furnace, and the secondary ammonia water is quickly gasified in the furnace, so that the effective components of the gas can be increased, and the moisture of the coal blocks is increased by 2-6%. The secondary ammonia water dry distillation treatment method comprises the following steps: the secondary ammonia water is pressurized by a pressurizing water pump, is conveyed to the top of the pump composite furnace through a pipeline, is sprayed onto the coal blocks in the top of the furnace through a spiral spray head, and is subjected to dry distillation treatment. The secondary ammonia water is sprayed onto the coal blocks through the spiral spray heads, so that the moisture of the coal blocks is increased by 2-6%, and the secondary ammonia water is also favorable for removing gas generated by coal gas, is free of dust, is favorable for controlling the furnace top temperature of the composite furnace, and prevents the furnace top from catching fire and exploding. Furthermore, the secondary ammonia water is pressurized to 0.1-0.5 Mpa by a pressurizing water pump, and the pressure of the secondary ammonia water is 0.1-0.5 Mpa, so that the angle and the particle size of the secondary ammonia water sprayed by the spiral spray nozzle can be ensured, the dry distillation time is reduced, and the dry distillation effect is improved.
Because a large amount of free ammonium (such as (NH)) is still in the residual ammonia water (secondary ammonia water)4）2CO3、NH4OH, etc.) and fixed ammonium (NH)4Cl、（NH4）2SO3、NH4SCN etc.), free ammonium can be evaporated out under high temperature, and fixed ammonium need be converted into free ammonium at alkali lye and can be evaporated out, consequently, in step four, add alkali lye in spraying the secondary ammonia water of the high temperature region of composite furnace carbonization chamber, make the PH =7.5~8.0 of secondary ammonia water, thereby ensure that the fixed ammonium in the secondary ammonia water also can be evaporated out, reduce the volume of coal piece internal fixation ammonium, reduce the environmental protection handling capacity of later stage sewage and waste residue. The alkaline solution in this embodiment includes but is not limited to NaOH solution, KOH solution, Na2CO3Solution, NaHCO3And (3) solution.
In the embodiment 1 and the embodiment 2, after the residual ammonia water produced by the coking enterprises is subjected to sedimentation treatment, the obtained secondary ammonia water is sprayed into the furnace top of the composite furnace or the high-temperature area of the carbonization chamber for recycling, so that the emptying rate and the discharge capacity of the residual ammonia water are reduced, the effective components of the raw coke oven gas can be increased, the auxiliary control of the temperature of the furnace top of the composite furnace is facilitated, and the purposes of energy conservation, environmental protection, safety and reliability in production are achieved.
Example 3:
as shown in fig. 2, the embodiment provides a device for treating residual ammonia water, which is applied to the process for treating residual ammonia water in the above embodiment, and comprises a plurality of composite furnaces 1, wherein a gas collecting tank 2, a first separator 3, a primary cooling tower 4, a horizontal pipe cooling tower 5, a second separator 6 and an electric tar precipitator 7 are sequentially connected to the gas outlet end of the composite furnaces 1. The upper end liquid outlet of the electrical tar precipitator 7 is connected with an ammonia water storage tank 9 through a gas fan 8, and the lower end liquid outlet of the electrical tar precipitator 7 is connected with a tar storage tank 10 through a pipeline.
As shown in fig. 3, an outlet end of the main ammonia water supply pipe of the ammonia water storage tank 9 is connected to an ammonia water treatment device 11, the ammonia water treatment device includes an 11 ammonia water preprocessor 110, the ammonia water preprocessor 110 is in pipeline communication with an ammonia water treatment device 111, and the ammonia water treatment device 111 is connected to a first pipeline 113 and a second pipeline 114 through a main pipeline 112.
The first pipeline 113 is communicated with the tops of the plurality of composite furnaces 1, and a plurality of spiral spray heads 115 are arranged on the first pipeline 113 positioned at the tops of the plurality of composite furnaces.
The second pipeline 114 is communicated with the high-temperature areas of the carbonization chambers of the plurality of composite furnaces 1, and the second pipeline 114 located in the high-temperature areas of the carbonization chambers of the plurality of composite furnaces is provided with a plurality of special nozzles 116, the special nozzles include but are not limited to rotary nozzles, water sprinklers and sand blasting nozzles, and in the embodiment, the special nozzles 116 are preferably rotary nozzles.
The ammonia water treatment device 11 which is simple in structure and convenient in construction operation is added to the original device, so that residual ammonia water (secondary ammonia water) generated at the rear end of the process is recycled.
Example 4:
as shown in fig. 3, as a further optimization of the ammonia water treatment apparatus 11 of embodiment 3, a pressurizing water pump 117 is further provided on the main pipe 112, and the pressurizing water pump 117 is used for pressurizing the secondary ammonia water entering the main pipe 112 to make the pressure of the secondary ammonia water be 0.1 to 0.5 Mpa.
As shown in fig. 3, the sewage discharge ports at the lower ends of the ammonia water preprocessor 110 and the ammonia water treatment unit 111 are connected to a total ammonia water return pipe for discharging the oil stains in the ammonia water preprocessor 110 and the ammonia water treatment unit 111.
As shown in fig. 3, in order to facilitate the control of the pressure of the secondary ammonia water in the main pipe 112 and the control of the amount of the secondary ammonia water flowing into the top of the compound furnace 1 through the first pipe 113 and the high temperature region of the carbonization chamber of the compound furnace 1 through the second pipe 114, an electromagnetic flow valve 118 and an adjusting valve 119 are provided in the first pipe 114 and the second pipe 115, respectively, and a pressure valve 120 is provided in the main pipe 112.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The treatment process of the residual ammonia water is characterized by comprising the following steps of:
step one, raw coke oven gas generated in a composite furnace is sequentially washed, cooled and separated to obtain ammonia water and tar, and the ammonia water is collected into an ammonia water storage tank;
secondly, sending ammonia water into an ammonia water preprocessor through an ammonia water main water supply pipe for primary sedimentation treatment, separating to obtain primary oil stain and primary ammonia water, conveying the primary oil stain to an ammonia water main water return pipe and discharging, and conveying the primary ammonia water into an ammonia water treatment device through a pipeline;
step three, carrying out secondary sedimentation treatment on the primary ammonia water in an ammonia water treatment device, separating to obtain secondary oil stain and secondary ammonia water, conveying the secondary oil stain to an ammonia water main return pipe and discharging, and discharging and temporarily storing the secondary ammonia water through a pipeline;
conveying part of secondary ammonia water to the top of the composite furnace through a pipeline for dry distillation treatment; and conveying the other part of secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline for gasification treatment, and discharging the raw gas generated in the composite furnace into a subsequent ammonia water process for treatment.
2. The process for treating residual ammonia water according to claim 1, wherein in the fourth step, the secondary ammonia water dry distillation treatment method comprises the following steps: the secondary ammonia water is pressurized by a pressurizing water pump, is conveyed to the top of the pump composite furnace through a pipeline, is sprayed onto the coal blocks in the top of the furnace through a spiral spray head, and is subjected to dry distillation treatment.
3. The process for treating residual ammonia water according to claim 1, wherein in the fourth step, the secondary ammonia water gasification treatment method comprises the following steps: pressurizing the secondary ammonia water by a pressurizing water pump, conveying the secondary ammonia water to a high-temperature area of a carbonization chamber of the composite furnace through a pipeline, spraying the secondary ammonia water onto the coal blocks through a spray head, and gasifying the secondary ammonia water.
4. The process for treating residual ammonia water according to claim 3, wherein in the fourth step, alkali liquor is added into the secondary ammonia water sprayed to the high-temperature zone of the carbonization chamber of the composite furnace, so that the pH of the secondary ammonia water is = 7.5-8.0.
5. The process for treating residual ammonia water according to claim 2 or 3, wherein the secondary ammonia water is pressurized to 0.1 to 0.5MPa by a pressurized water pump.
6. Be applied to processing apparatus of surplus aqueous ammonia of processing technology of surplus aqueous ammonia, including a plurality of combined furnace, the combined furnace end of giving vent to anger has connected gradually gas collecting tank, first separator, just cold tower, violently manages cooling tower, second separator, electric tar precipitator, its characterized in that: a liquid outlet at the upper end of the electric tar precipitator is connected with an ammonia water storage tank through a gas fan, and a liquid outlet at the lower end of the electric tar precipitator is connected with a tar storage tank through a pipeline;
the outlet end of an ammonia water main water supply pipe of the ammonia water storage tank is connected with an ammonia water treatment device, the ammonia water treatment device comprises an ammonia water preprocessor, the ammonia water preprocessor is communicated with an ammonia water processor through a pipeline, and the ammonia water processor is connected with a first pipeline and a second pipeline through a main pipeline;
the first pipeline is communicated with a plurality of furnace tops of the composite furnaces, and a plurality of spiral spray heads are arranged on the first pipeline positioned at the furnace tops of the composite furnaces;
the second pipeline is communicated with the high-temperature area of the composite furnace carbonization chamber and is positioned in the high-temperature area of the composite furnace carbonization chamber, a plurality of special nozzles are arranged on the second pipeline, and the special nozzles include but are not limited to rotary nozzles, water sprinkling nozzles and sand blasting nozzles.
7. The apparatus for treating residual ammonia water according to claim 6, wherein: still be equipped with the booster pump on the trunk line, the booster pump is used for to getting into secondary aqueous ammonia pressurization in the trunk line makes the pressure of secondary aqueous ammonia 0.1~0.5 Mpa.
8. The apparatus for treating residual ammonia water according to claim 6, wherein: the ammonia water preprocessor and the drain outlet at the lower end of the ammonia water treatment device are connected with an ammonia water main return pipe and used for discharging the oil stains in the ammonia water preprocessing and the ammonia water treatment device.
9. The apparatus for treating residual ammonia water according to claim 6, wherein: the first pipeline reaches be equipped with electromagnetic flow valve, governing valve on the second pipeline respectively, be equipped with the pressure valve on the trunk line.
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