CN113209807A - High-temperature oil-containing waste steam recycling method - Google Patents
High-temperature oil-containing waste steam recycling method Download PDFInfo
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- CN113209807A CN113209807A CN202110527676.6A CN202110527676A CN113209807A CN 113209807 A CN113209807 A CN 113209807A CN 202110527676 A CN202110527676 A CN 202110527676A CN 113209807 A CN113209807 A CN 113209807A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
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- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention discloses a method for recycling high-temperature oil-containing waste steam, which comprises the following steps: converting the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing noncondensable gas; conveying condensed water and sulfur-containing non-condensable gas to a circulating fluidized bed boiler; capturing carbon dioxide in flue gas generated in the circulating fluidized bed boiler; wherein the condensed water and the sulfur-containing non-condensable gases are conveyed to a circulating fluidized bed boiler, comprising: conveying the sulfur-containing noncondensable gas into a circulating fluidized bed boiler for desulfurization treatment; the desulfurization treatment comprises the following steps: in-furnace desulfurization and wet desulfurization; in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 850-900 ℃, and the calcium-sulfur ratio is 2-2.5; in the wet desulphurization process, the lime slurry wet desulphurization agent is adopted for desulphurization. The method for recycling the high-temperature oil-containing waste steam can ensure that the oil-containing waste steam is discharged up to the standard, effectively utilizes the recycled condensed water, light oil and sulfur-containing non-condensable gas, and efficiently removes the sulfur in the non-condensable gas.
Description
Technical Field
The invention belongs to the technical field of waste gas treatment, and particularly relates to a method for recycling high-temperature oil-containing waste gas.
Background
At present, the heavy oil is generally exploited by adopting a thermal recovery mode, which is completed by utilizing a heavy oil heating viscosity reduction mechanism, an oil layer thermoelastic energy release oil displacement mechanism and dilution and miscible phase effects generated by distillation, cracking and emulsification of the heavy oil by steam. By injecting a large amount of steam into the crude oil in the stratum, the seepage capability of the thick oil can be improved, and the industrialized exploitation of the thick oil can be realized. However, in the process of heavy oil thermal recovery, the temperature of the oil well produced liquid is higher and the pressure is higher. After the produced liquid of the oil well is conveyed to the ground, the produced liquid needs to be subjected to cooling and pressure reduction treatment. Due to the reduced pressure, a large amount of flash steam will be generated and these flash steam will be vented to the atmosphere through the upper outlets of the vapor and liquid phase buffer tanks, respectively. The waste steam also contains tiny oil drops and a small amount of non-condensable gas, thereby causing environmental pollution, waste of heat energy and waste of oil gas resources.
For the treatment process of heavy oil thermal recovery oil-containing waste steam, a direct cooling method is generally adopted, namely: waste steam containing water vapor, non-condensable gas (containing hydrogen sulfide) and light oil firstly enters a cooling device for cooling, then is separated by a gas-liquid separator, separated liquid phase (light oil and low-temperature water) is conveyed back to a gathering and transportation system, and separated non-condensable gas enters a non-condensable gas treatment device for desulfurization. The main disadvantages of this direct cooling process are: oily particles in the oily waste gas are easy to attach to the heat exchange surface of the cooler, so that the heat exchange effect of the cooler is reduced; the existence of non-condensable gas in the oil-containing waste gas reduces the total heat exchange coefficient, and causes heat transfer deterioration; because of the influence of production, the fluctuation of the waste steam is large, the temperature of the waste steam cooled by adopting a direct cooling mode is not controllable, and the breakdown of a rear-end desulphurization device can be caused; the tolerance of the direct cooling device is poor, and the system paralysis can be caused by the waste gas carrying crude oil entering the device; the water cooling system is easily restricted by water sources, and cannot ensure stable cold source supply, so that the waste steam treatment load is influenced.
In addition, the process of 'spraying, oil-water separation and closed circulating water cooling' is adopted in the prior art to treat the heavy oil thermal recovery oil-containing waste steam, although the technology realizes the closed treatment of the oil-containing waste steam and realizes the standard emission, the technology does not effectively utilize the recovered non-condensable gas, condensed water and light oil, and the sulfur content of the non-condensable gas is high, but the existing desulfurization process has high cost, large investment and poor benefit.
Therefore, a method for recycling high-temperature oil-containing waste gas is needed to ensure that the oil-containing waste gas is discharged after reaching standards, effectively utilize the recycled condensed water, light oil and sulfur-containing non-condensable gas, and efficiently remove sulfur in the non-condensable gas.
Disclosure of Invention
In view of the above problems, the present invention provides a method for recycling high-temperature oil-containing waste steam. The method for recycling the high-temperature oil-containing waste steam can ensure that the oil-containing waste steam is discharged up to the standard, effectively utilizes the recycled condensed water, light oil and sulfur-containing non-condensable gas, and efficiently removes the sulfur in the non-condensable gas.
The technical scheme for realizing the purpose is as follows:
in one aspect of the invention, a high-temperature oil-containing waste steam recycling method is provided, wherein the method comprises the following steps:
converting the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing noncondensable gas;
conveying the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler;
capturing carbon dioxide in the flue gas generated in the circulating fluidized bed boiler;
wherein the delivering the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler comprises:
conveying the sulfur-containing non-condensable gas to the circulating fluidized bed boiler for desulfurization treatment;
the desulfurization treatment comprises the following steps: in-furnace desulfurization and wet desulfurization;
in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 850-900 ℃, and the calcium-sulfur ratio is 2-2.5;
in the wet desulphurization process, the lime slurry wet desulphurization agent is adopted for desulphurization.
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, the desulfurization rate is more than or equal to 90% after the desulfurization in the furnace is completed, and the sulfur content in the desulfurized flue gas in the circulating fluidized bed boiler is less than or equal to 300mg/Nm3；
After the wet desulphurization is finished, the sulfur content in the desulphurization flue gas in the circulating fluidized bed boiler is less than or equal to 35mg/Nm3。
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam according to the present invention, the capturing carbon dioxide of the flue gas generated in the circulating fluidized bed boiler comprises:
conveying the flue gas generated in the circulating fluidized bed boiler to an absorption tower of a carbon dioxide paving device;
contacting the flue gas with an amine-poor liquid in the absorption tower, so that carbon dioxide in the flue gas is absorbed by the amine-poor liquid to form an amine-rich liquid;
exchanging heat between the amine-rich liquid and the lean amine liquid in a desorption tower of the carbon dioxide paving device to enable the temperature of the amine-rich liquid to be 40-45 ℃ higher than that of the flue gas;
and carrying out amine liquid regeneration on the amine-rich liquid in the desorption tower, so as to separate out carbon dioxide contained in the amine-rich liquid, and finishing the carbon dioxide paving.
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste gas, the feeding the condensed water and the sulfur-containing non-condensable gas to a circulating fluidized bed boiler comprises:
conveying the condensed water to the circulating fluidized bed boiler, and converting the condensed water into steam for crude oil extraction.
In some embodiments of the present invention, the light oil is used for the preparation of white oil in the high temperature oil-containing waste steam recycling method of the present invention.
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, during the process of desulphurization in the furnace, the temperature of the circulating fluidized bed boiler is 860-880 ℃, and the calcium-sulfur ratio is 2-2.2.
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam, the temperature of the circulating fluidized bed boiler is 860 ℃ and the calcium-sulfur ratio is 2 during the desulfurization in the furnace.
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, the sulfur content in the high-temperature oil-containing waste steam is 6000-8000 mg/Nm3。
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, the addition rate of the lime slurry wet desulfurizing agent is 90-160 kg/min.
In some preferred embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, the addition rate of the lime slurry wet desulfurizing agent is 150-160 kg/min.
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, a calcium desulfurizer is used in the process of in-furnace desulfurization;
wherein the adding speed of the calcium desulfurizer is 60-160 kg/min.
In some preferred embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam, a calcium desulfurizer is used in the process of in-furnace desulfurization;
wherein the adding rate of the calcium desulfurizer is 150-160 kg/min.
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam according to the present invention, the process shown in fig. 1 may be used to convert the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing non-condensable gas.
In some embodiments of the present invention, a circulating fluidized bed boiler as shown in fig. 3 can be used in the high temperature oil-containing waste steam recycling method of the present invention.
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam according to the present invention, a carbon dioxide capture device as shown in fig. 4 may be used.
One or more technical embodiments of the present invention have at least the following technical effects or advantages:
(1) the method for recycling the high-temperature oil-containing waste steam can ensure that the oil-containing waste steam is discharged up to the standard, effectively utilizes the recycled condensed water, light oil and sulfur-containing non-condensable gas, and efficiently removes the sulfur in the non-condensable gas.
(2) The invention provides a method for recycling high-temperature oil-containing waste steam, which is characterized in that on the basis of converting the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing non-condensable gas by adopting a process of spraying, oil-water separation and closed circulating water cooling, the method also comprises the steps of conveying the condensed water and the sulfur-containing non-condensable gas to a circulating fluidized bed boiler, and carrying out harmless treatment on the sulfur-containing non-condensable gas by utilizing a desulfurization process in the fluidized bed boiler; meanwhile, condensed water is converted into superheated steam for thermal recovery of thickened oil, so that resource utilization of waste steam and condensed water is realized; in addition, the method also carries out carbon dioxide capture on the flue gas generated in the circulating fluidized bed boiler, buries the captured carbon dioxide into an oil reservoir to drive oil, reduces the emission of greenhouse gases, generates economic benefits, realizes the utilization of carbon dioxide resources and obviously improves social and environmental benefits.
(3) The method for recycling the high-temperature oil-containing waste steam can realize that the desulfurization rate is more than or equal to 90 percent and the sulfur content in the desulfurized flue gas is less than or equal to 300mg/Nm after the desulfurization in the furnace is finished3(ii) a After the wet desulphurization is finished, the sulfur content in the desulfurized flue gas can be less than or equal to 35mg/Nm3. In addition, the content of NOx (nitrogen oxide) can be ensured to be less than or equal to 50mg/Nm3The content of the particles is less than or equal to 10mg/Nm3And the ultra-clean discharge standard is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 shows a schematic diagram of a high temperature oil-containing waste steam recycling process according to some embodiments of the present invention.
FIG. 2 shows a schematic of high temperature oil-containing waste steam recovery in accordance with some embodiments of the present invention.
FIG. 3 illustrates a process flow diagram for a circulating fluidized bed boiler according to some embodiments of the present invention.
Fig. 4 illustrates a process flow diagram for a carbon dioxide sequestration apparatus in accordance with some embodiments of the present invention.
Fig. 5 shows a flow diagram of a prior art spray + oil-water separation + closed cycle water cooling process.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
in some embodiments of the present invention, a method for recycling high-temperature oil-containing waste steam is provided, wherein the method comprises:
converting the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing noncondensable gas;
conveying the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler;
capturing carbon dioxide in the flue gas generated in the circulating fluidized bed boiler;
wherein the delivering the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler comprises:
conveying the sulfur-containing non-condensable gas to the circulating fluidized bed boiler for desulfurization treatment;
the desulfurization treatment comprises the following steps: in-furnace desulfurization and wet desulfurization;
in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 850-900 ℃, and the calcium-sulfur ratio is 2-2.5;
in the wet desulphurization process, the lime slurry wet desulphurization agent is adopted for desulphurization.
The method for recycling the high-temperature oil-containing waste steam can ensure that the oil-containing waste steam is discharged up to the standard, effectively utilizes the recycled condensed water, light oil and sulfur-containing non-condensable gas, and efficiently removes the sulfur in the non-condensable gas. By adopting the circulating fluidized bed boiler, the harmful gas SO caused by the burning coal can be effectively controlled through in-furnace desulfurization and wet desulfurization2、NOXThe amount of discharge of (c). Wherein, the normal temperature of the circulating fluidized bed boiler is 950-1050 ℃ to improve the burnout rate of coke particles. However, the optimum temperature for the desulfurization reaction is 850-900 deg.C, too high (C>920 ℃ C.), the desulfurization reaction rate is made high, but the desulfurization efficiency and the desulfurizing agent utilization rate are lowered. In order to achieve the purpose of the invention, the temperature of the circulating fluidized bed boiler is finally determined to be 850-900 ℃ through a large number of equilibrium optimization tests. In addition, the calcium-sulfur ratio is one of the key factors to be considered for the desulfurization in the circulating fluidized bed boiler, the desulfurization efficiency is improved along with the increase of the calcium-sulfur ratio, but the bed temperature is reduced because limestone can perform endothermic decomposition reaction in the furnace bed after entering the furnace. And the higher the calcium-sulfur ratio, the more rapid the decrease in bed temperature. The inventor limits the calcium-sulfur ratio to be 2-2.5 through a large number of balance optimization tests, can ensure the desulfurization efficiency, and can prevent the bed temperature from being reduced too much to influence the normal operation of a boiler, thereby realizing the beneficial effect of the invention. Furthermore, the lime slurry wet desulphurization agent is mainly a calcium-based compound, and can realize the following technical effects: high desulfurizing efficiency>90 percent; utilization rate of absorbent>90 percent; rate of equipment operation>90％。
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam, the capturing carbon dioxide of the flue gas generated in the circulating fluidized bed boiler comprises:
conveying the flue gas generated in the circulating fluidized bed boiler to an absorption tower of a carbon dioxide paving device;
contacting the flue gas with an amine-poor liquid in the absorption tower, so that carbon dioxide in the flue gas is absorbed by the amine-poor liquid to form an amine-rich liquid;
exchanging heat between the amine-rich liquid and the lean amine liquid in a desorption tower of the carbon dioxide paving device to enable the temperature of the amine-rich liquid to be 40-45 ℃ higher than that of the flue gas;
and carrying out amine liquid regeneration on the amine-rich liquid in the desorption tower, so as to separate out carbon dioxide contained in the amine-rich liquid, and finishing the carbon dioxide paving.
The invention collects the carbon dioxide in the smoke generated in the circulating fluidized bed boiler, buries the collected carbon dioxide in an oil reservoir to drive oil, reduces the emission of greenhouse gases, generates economic benefits, realizes the utilization of carbon dioxide resources and obviously improves social and environmental benefits. The main components of the lean amine liquid or the rich amine liquid for capturing carbon dioxide in the application comprise: DEA (diethanolamine), MDEA (methyldiethanolamine), AEEA (hydroxyethylethanolamine), PZ (piperazine). The lean amine liquid or rich amine liquid has low energy consumption and low desorption temperature and is not easy to degrade; the volume fraction of carbon dioxide in the mixed gas can be captured to be 2-90%, the large absorption capacity of solution expanding per hour is achieved, and the desorption efficiency reaches 98%.
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, during the process of desulphurization in the furnace, the temperature of the circulating fluidized bed boiler is 860-880 ℃, and the calcium-sulfur ratio is 2-2.2.
Through a great deal of research, the temperature of the circulating fluidized bed boiler is limited to 860-880 ℃, and the calcium-sulfur ratio is limited to 2-2.2, so that the technical effect of further optimization is realized.
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam, during the desulfurization in the furnace, the temperature of the circulating fluidized bed boiler is 860 ℃, and the calcium-sulfur ratio is 2.
Through a great deal of research, the temperature of the circulating fluidized bed boiler is limited to 860 ℃, and the calcium-sulfur ratio is limited to 2, so that the further optimized technical effect is realized.
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, the sulfur content in the high-temperature oil-containing waste steam is 6000-8000 mg/Nm3。
Through a great deal of research, the sulfur content in the high-temperature oil-containing waste steam is limited to 6000-8000 mg/Nm3。
In some embodiments of the invention, in the method for recycling high-temperature oil-containing waste steam, the addition rate of the lime slurry wet desulfurizing agent is 90-160 kg/min, preferably 150-160 kg/min
Through a great deal of research, the addition rate of the lime slurry wet desulfurizing agent is limited to 90-160 kg/min, preferably 150-160 kg/min, so as to realize a more excellent technology.
In some embodiments of the present invention, in the method for recycling high-temperature oil-containing waste steam, a calcium desulfurizer is used in the process of desulfurization in the furnace;
wherein the adding speed of the calcium desulfurizer is 60-160 kg/min, preferably 150-160 kg/min.
Through a great deal of research, the adding speed of the calcium desulfurizer is limited to be 60-160 kg/min, preferably 150-160 kg/min, so that a more excellent technology is realized, and finally an ultra-clean emission standard is realized.
The method for recycling high-temperature oil-containing waste steam described in the present application will be described in detail with reference to examples and comparative examples.
Example 1: the invention relates to a method for recycling high-temperature oil-containing waste steam
(1) The sulfur content was 6000mg/Nm by the process shown in FIG. 23Converting the discharged high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing noncondensable gas; the high-temperature oil-containing waste steam is subjected to heat exchange with low-temperature water in the spray tower, wherein water vapor in the high-temperature oil-containing waste steam is condensed into condensed water (high-temperature water), one part of the high-temperature water is cooled into low-temperature water to be used as spray water to enter the spray tower for recycling, and the other part of the high-temperature water is treated by water and is used as make-up water in the circulating fluidized bed boiler after reaching the standard.
(2) Feeding the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler as shown in FIG. 3; conveying sulfur-containing non-condensable gas into a circulating fluidized bed boiler for in-furnace desulfurization and wet desulfurization; in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 850 ℃, the calcium-sulfur ratio is 2, and the adding speed of the calcium desulfurizer is 60 kg/min; after the desulfurization in the furnace is finished, the desulfurization rate is more than or equal to 90 percent, and the sulfur content in the desulfurized flue gas is less than or equal to 300 percentmg/Nm3(ii) a In the wet desulphurization process, the lime slurry wet desulphurization agent is adopted for desulphurization, the addition rate of the lime slurry wet desulphurization agent is 90kg/min, and after the wet desulphurization is finished, the sulfur content in the desulphurization flue gas is less than or equal to 35mg/Nm3(ii) a And conveying the condensed water to a circulating fluidized bed boiler, and converting the condensed water into steam for crude oil exploitation.
(3) Capturing carbon dioxide in the flue gas generated in the circulating fluidized bed boiler; wherein the flue gas generated in the circulating fluidized bed boiler is delivered to the absorption tower of the carbon dioxide collecting device as shown in fig. 4; contacting the flue gas with lean amine liquid in an absorption tower so that carbon dioxide in the flue gas is absorbed by the lean amine liquid to form rich amine liquid; exchanging heat between the amine-rich liquid and the lean amine liquid in a desorption tower of the carbon dioxide paving device to ensure that the temperature of the amine-rich liquid is higher than 40 ℃; and (2) regenerating the amine-rich liquid in a desorption tower to separate carbon dioxide contained in the amine-rich liquid, completing the paving of the carbon dioxide, burying the trapped carbon dioxide into an oil reservoir to displace oil, reducing the emission of greenhouse gases, generating economic benefits and realizing the utilization of carbon dioxide resources.
In the embodiment, after the desulfurization in the furnace is finished, the desulfurization rate can be more than or equal to 90 percent, and the sulfur content in the desulfurized flue gas can be less than or equal to 300mg/Nm3(ii) a After the wet desulphurization is finished, the sulfur content in the desulfurized flue gas can be less than or equal to 35mg/Nm3(ii) a In addition, the content of NOx (nitrogen oxide) can be ensured to be less than or equal to 50mg/Nm3The content of the particles is less than or equal to 10mg/Nm3And the ultra-clean discharge standard is achieved.
Example 2: the invention relates to a method for recycling high-temperature oil-containing waste steam
(1) The sulfur content was 8000mg/Nm by the process shown in FIG. 13Converting the discharged high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing noncondensable gas; wherein, the high-temperature oil-containing waste steam exchanges heat with low-temperature water in the spray tower, the water vapor in the high-temperature oil-containing waste steam is condensed into condensed water (high-temperature water), one part of the high-temperature water is cooled into low-temperature water to be used as spray water to enter the spray tower for recycling, and the other part of the high-temperature water is subjected to water passingThe treated water is used as the replenishing water in the circulating fluidized bed boiler after reaching the standard.
(2) Feeding the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler as shown in FIG. 3; conveying sulfur-containing non-condensable gas into a circulating fluidized bed boiler for in-furnace desulfurization and wet desulfurization; in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 900 ℃, the calcium-sulfur ratio is 2.5, and the adding speed of the calcium desulfurizer is 160 kg/min; after the desulfurization in the furnace is finished, the desulfurization rate is more than or equal to 90 percent, and the sulfur content in the desulfurized flue gas is less than or equal to 300mg/Nm3(ii) a In the wet desulphurization process, the lime slurry wet desulphurization agent is adopted for desulphurization, the addition rate of the lime slurry wet desulphurization agent is 160kg/min, and after the wet desulphurization is finished, the sulfur content in the desulphurization flue gas is less than or equal to 35mg/Nm3(ii) a And conveying the condensed water to a circulating fluidized bed boiler, and converting the condensed water into steam for crude oil exploitation.
(3) Capturing carbon dioxide in flue gas generated in the circulating fluidized bed boiler; wherein the flue gas generated in the circulating fluidized bed boiler is delivered to the absorption tower of the carbon dioxide collecting device as shown in fig. 4; contacting the flue gas with lean amine liquid in an absorption tower so that carbon dioxide in the flue gas is absorbed by the lean amine liquid to form rich amine liquid; exchanging heat between the amine-rich liquid and the lean amine liquid in a desorption tower of the carbon dioxide paving device to ensure that the temperature of the amine-rich liquid is higher than 45 ℃; and (2) regenerating the amine-rich liquid in a desorption tower to separate carbon dioxide contained in the amine-rich liquid, completing the paving of the carbon dioxide, burying the trapped carbon dioxide into an oil reservoir to displace oil, reducing the emission of greenhouse gases, generating economic benefits and realizing the utilization of carbon dioxide resources.
In the embodiment, after the desulfurization in the furnace is finished, the desulfurization rate can be more than or equal to 90 percent, and the sulfur content in the desulfurized flue gas can be less than or equal to 300mg/Nm3(ii) a After the wet desulphurization is finished, the sulfur content in the desulfurized flue gas can be less than or equal to 35mg/Nm3(ii) a In addition, the content of NOx (nitrogen oxide) can be ensured to be less than or equal to 50mg/Nm3The content of the particles is less than or equal to 10mg/Nm3And the ultra-clean discharge standard is achieved.
Example 3: the invention relates to a method for recycling high-temperature oil-containing waste steamMethod of
(1) The sulfur content was 7000mg/Nm by the process shown in FIG. 13Converting the discharged high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing noncondensable gas; the high-temperature oil-containing waste steam is subjected to heat exchange with low-temperature water in the spray tower, wherein water vapor in the high-temperature oil-containing waste steam is condensed into condensed water (high-temperature water), one part of the high-temperature water is cooled into low-temperature water to be used as spray water to enter the spray tower for recycling, and the other part of the high-temperature water is treated by water and is used as make-up water in the circulating fluidized bed boiler after reaching the standard.
(2) Feeding the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler as shown in FIG. 3; conveying sulfur-containing non-condensable gas into a circulating fluidized bed boiler for in-furnace desulfurization and wet desulfurization; in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 860 ℃, the calcium-sulfur ratio is 2, and the adding speed of the calcium desulfurizer is 150 kg/min; after the desulfurization in the furnace is finished, the desulfurization rate is more than or equal to 90 percent, and the sulfur content in the desulfurized flue gas is less than or equal to 280mg/Nm3(ii) a In the wet desulphurization process, the lime slurry wet desulphurization agent is adopted for desulphurization, the addition rate of the lime slurry wet desulphurization agent is 150kg/min, and after the wet desulphurization is finished, the sulfur content in the desulphurization flue gas is less than or equal to 30mg/Nm3(ii) a And conveying the condensed water to a circulating fluidized bed boiler, and converting the condensed water into steam for crude oil exploitation.
(3) Capturing carbon dioxide in flue gas generated in the circulating fluidized bed boiler; wherein the flue gas generated in the circulating fluidized bed boiler is delivered to the absorption tower of the carbon dioxide collecting device as shown in fig. 4; contacting the flue gas with lean amine liquid in an absorption tower so that carbon dioxide in the flue gas is absorbed by the lean amine liquid to form rich amine liquid; exchanging heat between the amine-rich liquid and the lean amine liquid in a desorption tower of a carbon dioxide paving device to ensure that the temperature of the amine-rich liquid is higher than 40 ℃; and (2) regenerating the amine-rich liquid in a desorption tower to separate carbon dioxide contained in the amine-rich liquid, completing the paving of the carbon dioxide, burying the trapped carbon dioxide into an oil reservoir to displace oil, reducing the emission of greenhouse gases, generating economic benefits and realizing the utilization of carbon dioxide resources.
This exampleIn the method, after the desulfurization in the furnace is finished, the desulfurization rate can be more than or equal to 95 percent, and the sulfur content in the desulfurized flue gas can be less than or equal to 280mg/Nm3(ii) a After the wet desulphurization is finished, the sulfur content in the desulfurized flue gas can be less than or equal to 30mg/Nm3(ii) a In addition, the content of NOx (nitrogen oxide) can be ensured to be less than or equal to 45mg/Nm3The content of the particulate matters is less than or equal to 8mg/Nm3And the ultra-clean discharge standard is achieved.
Comparative example 1
Waste steam containing water vapor, non-condensable gas (containing hydrogen sulfide) and light oil firstly enters a cooling device for cooling, then is separated by a gas-liquid separator, separated liquid phase (light oil and low-temperature water) is conveyed back to a gathering and transportation system, and separated non-condensable gas enters a non-condensable gas treatment device for desulfurization.
As can be seen from the above examples and comparative examples of the present invention, the method for recycling high-temperature oil-containing waste steam provided by the present invention has at least the following technical effects:
(1) with the process of comparative example 1, the following drawbacks are evident: oily particles in the oily waste gas are easy to attach to the heat exchange surface of the cooler, so that the heat exchange effect of the cooler is reduced; the existence of non-condensable gas in the oil-containing waste gas reduces the total heat exchange coefficient, and causes heat transfer deterioration; because of the influence of production, the fluctuation of the waste steam is large, the temperature of the waste steam cooled by adopting a direct cooling mode is not controllable, and the breakdown of a rear-end desulphurization device can be caused; the tolerance of the direct cooling device is poor, and the system paralysis can be caused by the waste gas carrying crude oil entering the device; the water cooling system is easily restricted by water sources, and cannot ensure stable cold source supply, so that the waste steam treatment load is influenced. The method for recycling the high-temperature oil-containing waste gas can ensure that the oil-containing waste gas is discharged up to the standard, effectively utilizes the recycled condensed water, light oil and sulfur-containing non-condensable gas, and efficiently removes the sulfur in the non-condensable gas.
(2) The invention provides a method for recycling high-temperature oil-containing waste steam, which is characterized in that on the basis of converting the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing non-condensable gas by adopting a process of spraying, oil-water separation and closed circulating water cooling, the method also comprises the steps of conveying the condensed water and the sulfur-containing non-condensable gas to a circulating fluidized bed boiler, and carrying out harmless treatment on the sulfur-containing non-condensable gas by utilizing a desulfurization process in the fluidized bed boiler; meanwhile, condensed water is converted into superheated steam for thermal recovery of thickened oil, so that resource utilization of waste steam and condensed water is realized; in addition, the method also carries out carbon dioxide capture on the flue gas generated in the circulating fluidized bed boiler, buries the captured carbon dioxide into an oil reservoir to drive oil, reduces the emission of greenhouse gases, simultaneously generates economic benefits, realizes the utilization of carbon dioxide resources, and obviously improves social and environmental benefits.
(3) The method for recycling the high-temperature oil-containing waste steam can realize that the desulfurization rate is more than or equal to 90 percent and the sulfur content in the desulfurized flue gas is less than or equal to 300mg/Nm after the desulfurization in the furnace is finished3(ii) a After the wet desulphurization is finished, the sulfur content in the desulfurized flue gas can be less than or equal to 35mg/Nm3. In addition, the content of NOx (nitrogen oxide) can be ensured to be less than or equal to 50mg/Nm3The content of the particles is less than or equal to 10mg/Nm3And the ultra-clean discharge standard is achieved.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for recycling high-temperature oil-containing waste steam is characterized by comprising the following steps:
converting the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing noncondensable gas;
conveying the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler;
capturing carbon dioxide in the flue gas generated in the circulating fluidized bed boiler;
wherein the delivering the condensed water and the sulfur-containing non-condensable gases to a circulating fluidized bed boiler comprises:
conveying the sulfur-containing non-condensable gas to the circulating fluidized bed boiler for desulfurization treatment;
the desulfurization treatment comprises the following steps: in-furnace desulfurization and wet desulfurization;
in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 850-900 ℃, and the calcium-sulfur ratio is 2-2.5;
in the wet desulphurization process, the lime slurry wet desulphurization agent is adopted for desulphurization.
2. The method for recycling high-temperature oil-containing waste steam according to claim 1, wherein after the completion of the desulfurization in the furnace, the desulfurization rate is not less than 90%, and the sulfur content in the desulfurization flue gas in the circulating fluidized bed boiler is not more than 300mg/Nm3；
After the wet desulphurization is finished, the sulfur content in the desulphurization flue gas in the circulating fluidized bed boiler is less than or equal to 35mg/Nm3。
3. The method for recycling the high-temperature oil-containing waste steam according to claim 1 or 2, wherein the step of capturing carbon dioxide in the flue gas generated in the circulating fluidized bed boiler comprises the following steps:
conveying the flue gas generated in the circulating fluidized bed boiler to an absorption tower of a carbon dioxide paving device;
contacting the flue gas with an amine-poor liquid in the absorption tower, so that carbon dioxide in the flue gas is absorbed by the amine-poor liquid to form an amine-rich liquid;
exchanging heat between the amine-rich liquid and the lean amine liquid in a desorption tower of the carbon dioxide paving device to enable the temperature of the amine-rich liquid to be 40-45 ℃ higher than that of the flue gas;
and carrying out amine liquid regeneration on the amine-rich liquid in the desorption tower, so as to separate out carbon dioxide contained in the amine-rich liquid, and finishing the carbon dioxide paving.
4. The method for recycling high-temperature oil-containing waste gas according to claim 1 or 2, wherein the step of conveying the condensed water and the sulfur-containing non-condensable gas to a circulating fluidized bed boiler comprises the following steps:
conveying the condensed water to the circulating fluidized bed boiler, and converting the condensed water into steam for crude oil extraction.
5. The method for recycling high-temperature oil-containing waste steam according to claim 1 or 2, wherein the light oil is used for preparing white oil.
6. The method for recycling the high-temperature oil-containing waste steam according to claim 1 or 2, wherein in the process of in-furnace desulfurization, the temperature of the circulating fluidized bed boiler is 860-880 ℃, and the calcium-sulfur ratio is 2-2.2.
7. The method for recycling the high-temperature oil-containing waste steam according to claim 1 or 2, wherein the temperature of the circulating fluidized bed boiler is 860 ℃ and the calcium-sulfur ratio is 2 during the desulfurization in the furnace.
8. The method for recycling high-temperature oil-containing waste steam according to claim 1 or 2, wherein the sulfur content in the high-temperature oil-containing waste steam is 6000-8000 mg/Nm3。
9. The method for recycling the high-temperature oil-containing waste steam according to claim 1 or 2, wherein the addition rate of the lime slurry wet desulfurizing agent is 90-160 kg/min.
10. The method for recycling the high-temperature oil-containing waste steam according to claim 1 or 2, characterized in that a calcium desulfurizer is adopted in the process of in-furnace desulfurization;
wherein the adding speed of the calcium desulfurizer is 60-160 kg/min.
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| CN114395425A (en) * | 2022-01-27 | 2022-04-26 | 陕西华祥能源科技集团有限公司 | Coke oven gas desulfurization and oil removal system and process |
| CN114482927A (en) * | 2021-12-31 | 2022-05-13 | 西安本清化学技术有限公司 | Green low-carbon development system and method for thickened oil |
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