CA2917952C - Steam injection boiler - Google Patents
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- CA2917952C CA2917952C CA2917952A CA2917952A CA2917952C CA 2917952 C CA2917952 C CA 2917952C CA 2917952 A CA2917952 A CA 2917952A CA 2917952 A CA2917952 A CA 2917952A CA 2917952 C CA2917952 C CA 2917952C
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 45
- 150000003839 salts Chemical class 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 17
- 239000003546 flue gas Substances 0.000 claims description 17
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 23
- 239000000295 fuel oil Substances 0.000 abstract description 16
- 239000003921 oil Substances 0.000 abstract description 11
- 230000007423 decrease Effects 0.000 abstract description 9
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 238000009434 installation Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
The present utility model discloses a steam injection boiler comprising: a burner, a furnace, an outlet flue, a high-pressure steam drum, a net segment high- pressure evaporator, a high-pressure superheater, a salt segment high-pressure evaporator and a high-pressure economizer; the burner is provided at the front end of the furnace, and the outlet flue is provided at the tail end of the furnace; the high-pressure steam drum is divided into a net segment and a salt segment; the bottom of the net segment is connected to the net segment high-pressure evaporator, and the bottom of the salt segment is connected to the salt segment high-pressure evaporator; the steam outlet of the high-pressure steam drum is connected to the high-pressure superheater; the high-pressure economizer is located at the tail part of the furnace. The steam injection boiler of the present utility model can directly reuse water from heavy oil recovery, produce superheated steam of high parameters in order to improve oil recovery efficiency, and can also significantly decrease the amount of the oxynitride generated during the combustion, thereby reducing environmental pollution. The steam injection boiler of the present utility model is simple in structure, high in standardization, and it is convenient to transport the steam injection boiler integrally, thereby greatly reducing the on-site installation workload and cutting down the cost of the entire project.
Description
Steam Injection Boiler Technical Field The present utility model belongs to the field of oil exploration technology and particularly relates to a steam injection boiler for thermal recovery of heavy oil.
Background Art In order to solve the problem of poor fluidity of heavy oil in oil recovery, the technology of heavy oil thermal recovery by steam injection is developed. In the heavy oil steam injection thermal recovery technology, fuel oil, gas and coal, as fuels, are usually adopted to be burned in the furnace of the steam injection boiler.
Feedwater of the steam injection boiler is evaporated by heat in an evaporator thereof to produce steam of high temperature, which is injected into an oil well to raise the temperature of the heavy oil and decrease the viscosity thereof so as to facilitate exploitation. As a steam generation device, the steam injection boiler plays an important role in the technologies of thermal recovery of heavy oil. The current steam injection boilers usually have the following problems:
Firstly, producing superheated steam of high parameters to increase oil recovery efficiency and the low requirements on the steam quality during oil recovery are contradictory in terins of the quality of the boiler feedwater, and this problem cannot be solved by the current ordinary boilers as steam injection boiler. A large amount of water will be exploited during the process of steam injection thermal recovery of heavy oil. In order to decrease costs and protect the environment, water exploited is usually recycled by the steam injection boiler after being subjected to oil-water separation and sewage treatment. However, the exploited water has a high salt content, and its mineralization still exceed 2000mg/L after treatment, which goes far from the requirements of ordinary steam boiler on feedwater quality. As a result, the produced steam also has a high salt content, which cannot meet the requirements of an ordinary boiler steam quality on the salt content. If the steam is superheated, it will be a threat to the safe operation of the heating surface, and then it is impossible to produce superheated steam of higher parameters, thereby affecting the efficiency of heavy oil recovery. On the other hand, the steam generated by the steam injection boiler is used directly for oil recovery, since its requirements on the steam quality, particularly on the salt content, is far below the general industrial fields, while water quality requirements for ordinary boiler is much more strict than that for the steam injection boiler.
Secondly, the current steam injection boilers are complex in structure and low in degree of standardization, have relatively high requirements for transportation and management, need large amount of workload for on-site installation and require a long construction period, thereby increasing the cost of the entire project.
Moreover, the current steam injection boilers may produce a large amount of oxynitride during the combustion process, causing great pollution to the environment, and thus it is likely to be fined or be ordered to stop manufacturing for modification in areas having high environmental requirements, affecting normal production.
If the above problems cannot be solved, the application of the steam injection boiler to heavy oil recovery will be limited, which is not favorable to the promotion of the steam injection boiler.
Summary of the Utility Model In view of the above-mentioned problems in the prior art, the technical problem to be solved by the present utility model is to provide a steam injection boiler, which is capable of using the water from steam injection thermal recovery of heavy oil after treatment as the feedwater of the boiler, and produces superheated steam of high parameters for improving the efficiency of oil recovery.
To solve the above technical problems, the present utility model adopts the following technical solution: a steam injection boiler, comprising a burner, a furnace, an outlet flue, and a high-pressure steam drum, wherein the furnace is provided with a net segment high-pressure evaporator, a high-pressure superheater, a salt segment
Background Art In order to solve the problem of poor fluidity of heavy oil in oil recovery, the technology of heavy oil thermal recovery by steam injection is developed. In the heavy oil steam injection thermal recovery technology, fuel oil, gas and coal, as fuels, are usually adopted to be burned in the furnace of the steam injection boiler.
Feedwater of the steam injection boiler is evaporated by heat in an evaporator thereof to produce steam of high temperature, which is injected into an oil well to raise the temperature of the heavy oil and decrease the viscosity thereof so as to facilitate exploitation. As a steam generation device, the steam injection boiler plays an important role in the technologies of thermal recovery of heavy oil. The current steam injection boilers usually have the following problems:
Firstly, producing superheated steam of high parameters to increase oil recovery efficiency and the low requirements on the steam quality during oil recovery are contradictory in terins of the quality of the boiler feedwater, and this problem cannot be solved by the current ordinary boilers as steam injection boiler. A large amount of water will be exploited during the process of steam injection thermal recovery of heavy oil. In order to decrease costs and protect the environment, water exploited is usually recycled by the steam injection boiler after being subjected to oil-water separation and sewage treatment. However, the exploited water has a high salt content, and its mineralization still exceed 2000mg/L after treatment, which goes far from the requirements of ordinary steam boiler on feedwater quality. As a result, the produced steam also has a high salt content, which cannot meet the requirements of an ordinary boiler steam quality on the salt content. If the steam is superheated, it will be a threat to the safe operation of the heating surface, and then it is impossible to produce superheated steam of higher parameters, thereby affecting the efficiency of heavy oil recovery. On the other hand, the steam generated by the steam injection boiler is used directly for oil recovery, since its requirements on the steam quality, particularly on the salt content, is far below the general industrial fields, while water quality requirements for ordinary boiler is much more strict than that for the steam injection boiler.
Secondly, the current steam injection boilers are complex in structure and low in degree of standardization, have relatively high requirements for transportation and management, need large amount of workload for on-site installation and require a long construction period, thereby increasing the cost of the entire project.
Moreover, the current steam injection boilers may produce a large amount of oxynitride during the combustion process, causing great pollution to the environment, and thus it is likely to be fined or be ordered to stop manufacturing for modification in areas having high environmental requirements, affecting normal production.
If the above problems cannot be solved, the application of the steam injection boiler to heavy oil recovery will be limited, which is not favorable to the promotion of the steam injection boiler.
Summary of the Utility Model In view of the above-mentioned problems in the prior art, the technical problem to be solved by the present utility model is to provide a steam injection boiler, which is capable of using the water from steam injection thermal recovery of heavy oil after treatment as the feedwater of the boiler, and produces superheated steam of high parameters for improving the efficiency of oil recovery.
To solve the above technical problems, the present utility model adopts the following technical solution: a steam injection boiler, comprising a burner, a furnace, an outlet flue, and a high-pressure steam drum, wherein the furnace is provided with a net segment high-pressure evaporator, a high-pressure superheater, a salt segment
2 high-pressure evaporator and a high-pressure economizer;
the burner is provided at a front end of the furnace, and the outlet flue is provided at a trail end of the furnace;
the high-pressure steam drum is divided into a net segment and a salt segment, wherein the bottom of the net segment is connected to the net segment high-pressure evaporator by a net segment downcomer, and the bottom of the salt segment is connected to the salt segment high-pressure evaporator by a salt segment downcomer; a steam outlet of the high-pressure steam drum is connected to the high-pressure superheater;
and the high-pressure economizer is located at the tail part of the furnace, for preheating high-pressure feedwater which goes into the salt segment of the high-pressurc steam drum, and wherein high-pressure feedwater goes into the net segment of the high-pressure steam drum through a feed pipe which comprises a vertical section penetrating through a housing of the high-pressure steam drum and a horizontal section provided at the bottom of the net segment of the high-pressure steam drum, and the horizontal section is provided with a plurality of short outlet pipes which are in communication with the horizontal section, and openings of the short outlet pipes face the top of the high-pressure steam drum.
Preferably, the net segment high-pressure evaporator is closer to the burner than the high-pressure superheater and the salt segment high-pressure evaporator, so that the net segment high-pressure evaporator is located in a relatively high temperature area and the high-pressure superheater and the salt segment high-pressure evaporator are located in relatively low temperature areas.
Preferably, a flue gas pipe is connected between the outlet flue and an air duct inlet of the burner, and is used for feeding the flue gas into the furnace through the air duct inlet.
the burner is provided at a front end of the furnace, and the outlet flue is provided at a trail end of the furnace;
the high-pressure steam drum is divided into a net segment and a salt segment, wherein the bottom of the net segment is connected to the net segment high-pressure evaporator by a net segment downcomer, and the bottom of the salt segment is connected to the salt segment high-pressure evaporator by a salt segment downcomer; a steam outlet of the high-pressure steam drum is connected to the high-pressure superheater;
and the high-pressure economizer is located at the tail part of the furnace, for preheating high-pressure feedwater which goes into the salt segment of the high-pressurc steam drum, and wherein high-pressure feedwater goes into the net segment of the high-pressure steam drum through a feed pipe which comprises a vertical section penetrating through a housing of the high-pressure steam drum and a horizontal section provided at the bottom of the net segment of the high-pressure steam drum, and the horizontal section is provided with a plurality of short outlet pipes which are in communication with the horizontal section, and openings of the short outlet pipes face the top of the high-pressure steam drum.
Preferably, the net segment high-pressure evaporator is closer to the burner than the high-pressure superheater and the salt segment high-pressure evaporator, so that the net segment high-pressure evaporator is located in a relatively high temperature area and the high-pressure superheater and the salt segment high-pressure evaporator are located in relatively low temperature areas.
Preferably, a flue gas pipe is connected between the outlet flue and an air duct inlet of the burner, and is used for feeding the flue gas into the furnace through the air duct inlet.
3 = CA 2917952 2017-05-26 Preferably, a baffle is provided at the bottom inside of the high-pressure steam drum, and divides the lower portion of the high-pressure steam drum into the net segment and the salt segment; the upper portion of the high-pressure steam drum is communicated;
a communicating pipe for communicating the net segment and the salt segment is provided penetrating through the bottom of the baffle, so that the water having a higher salt content in the net segment goes into the salt segment through the communicating pipe.
Preferably, the high-pressure feedwater goes into the net segment of the high-pressure steam drum through a feed pipe which comprises a vertical section 3a penetrating through the housing of the high-pressure steam drum and a horizontal section provided at the bottom of the net segment of the high-pressure steam drum, wherein the horizontal section is provided with a plurality of short outlet pipes which communicate with the horizontal section and whose openings face towards the top of the high-pressure steam drum.
Preferably, the salt segments are two segments which are respectively located on both sides of the net segment.
Preferably, cyclone separators are provided in the net segment and the salt segments, respectively, and a secondary efficient steam-water separator is provided at the top of the net segment which corresponds to the steam outlet.
Preferably, level gauges are provided in the net segment and the salt segments, respectively.
Preferably, an air preheater is included, and it is provided at the tail part of the furnace, for preheating the air injected into the air duct inlet of the burner.
Preferably, the furnace, the net segment high-pressure evaporator, the high-pressure superheater, the salt segment high-pressure evaporator, the high-pressure economizer and the air preheater are all in prefabricated and modularized structures.
Compared with the prior arts, the steam injection boiler of the present utility model has the following advantageous effects:
1. The steam injection boiler of the present utility model solves the contradiction of feedwater quality caused by producing the high-parameter superheated steam and less-demanding of steam quality for oil recovery, and can directly reuse the water from heavy oil recovery, and can produce superheated steam of high parameters so as to improve efficiency of oil recovery. The high-pressure steam drum is divided into the net segment and the salt segments, and the salt content of the steam produced therefrom is significantly decreased after the highly efficient steam-water separation, so the steam can enter into the high-pressure superheater to be superheated without threatening the secure operation of the high-pressure superheater. Therefore,
a communicating pipe for communicating the net segment and the salt segment is provided penetrating through the bottom of the baffle, so that the water having a higher salt content in the net segment goes into the salt segment through the communicating pipe.
Preferably, the high-pressure feedwater goes into the net segment of the high-pressure steam drum through a feed pipe which comprises a vertical section 3a penetrating through the housing of the high-pressure steam drum and a horizontal section provided at the bottom of the net segment of the high-pressure steam drum, wherein the horizontal section is provided with a plurality of short outlet pipes which communicate with the horizontal section and whose openings face towards the top of the high-pressure steam drum.
Preferably, the salt segments are two segments which are respectively located on both sides of the net segment.
Preferably, cyclone separators are provided in the net segment and the salt segments, respectively, and a secondary efficient steam-water separator is provided at the top of the net segment which corresponds to the steam outlet.
Preferably, level gauges are provided in the net segment and the salt segments, respectively.
Preferably, an air preheater is included, and it is provided at the tail part of the furnace, for preheating the air injected into the air duct inlet of the burner.
Preferably, the furnace, the net segment high-pressure evaporator, the high-pressure superheater, the salt segment high-pressure evaporator, the high-pressure economizer and the air preheater are all in prefabricated and modularized structures.
Compared with the prior arts, the steam injection boiler of the present utility model has the following advantageous effects:
1. The steam injection boiler of the present utility model solves the contradiction of feedwater quality caused by producing the high-parameter superheated steam and less-demanding of steam quality for oil recovery, and can directly reuse the water from heavy oil recovery, and can produce superheated steam of high parameters so as to improve efficiency of oil recovery. The high-pressure steam drum is divided into the net segment and the salt segments, and the salt content of the steam produced therefrom is significantly decreased after the highly efficient steam-water separation, so the steam can enter into the high-pressure superheater to be superheated without threatening the secure operation of the high-pressure superheater. Therefore,
4 superheated steam of higher parameters is produced and oil recovery efficiency can be greatly improved. Meanwhile, the high-pressure superheater and the salt segment high-pressure evaporator are disposed at areas having a relatively low temperature and easy for maintenance, which guarantees safety and reliability during the process of steam generation.
2. The steam injection boiler of the present utility model employs recycling of flue gas and low nitrogen burners to inject the flue gas having a low temperature and low oxygen content into the furnace, which decreases the temperature and the oxygen content in the combustion zone, inhibits the production of oxynitride during combustion, dramatically decreases the amount of oxynitride generated during the combustion, thereby reducing environmental pollution.
3. The net segment high-pressure evaporator is disposed in front of the high-pressure superheater and decreases the temperature of the flue gas by absorbing heat through evaporation, so that the temperature of the flue gas in the high-pressure superheater zone is below the permitted level of the material, to ensure the high-pressure superheater working in a safe temperature range.
4. The net segment high-pressure evaporator, the high-pressure superheater, the salt segment high-pressure evaporator, the high-pressure economizer and the air preheater are modularized structures, which facilitates overall transportation, greatly reduces on-site installation workload and cuts down the cost of the whole project.
Brief Description of the Drawings FIG.1 is a schematic diagram showing the structure of the steam injection boiler of the present utility model.
FIG.2 is a schematic diagram illustrating the connection structure of the high-pressure steam drum, the net segment high-pressure evaporator and the salt segment high-pressure evaporator in the steam injection boiler of the present utility model.
Figure signs 1-the burner 2-the furnace 3-the outlet flue 4-the high-pressure steam drum 41-the net segment 42-the salt segment 43-the steam outlet
2. The steam injection boiler of the present utility model employs recycling of flue gas and low nitrogen burners to inject the flue gas having a low temperature and low oxygen content into the furnace, which decreases the temperature and the oxygen content in the combustion zone, inhibits the production of oxynitride during combustion, dramatically decreases the amount of oxynitride generated during the combustion, thereby reducing environmental pollution.
3. The net segment high-pressure evaporator is disposed in front of the high-pressure superheater and decreases the temperature of the flue gas by absorbing heat through evaporation, so that the temperature of the flue gas in the high-pressure superheater zone is below the permitted level of the material, to ensure the high-pressure superheater working in a safe temperature range.
4. The net segment high-pressure evaporator, the high-pressure superheater, the salt segment high-pressure evaporator, the high-pressure economizer and the air preheater are modularized structures, which facilitates overall transportation, greatly reduces on-site installation workload and cuts down the cost of the whole project.
Brief Description of the Drawings FIG.1 is a schematic diagram showing the structure of the steam injection boiler of the present utility model.
FIG.2 is a schematic diagram illustrating the connection structure of the high-pressure steam drum, the net segment high-pressure evaporator and the salt segment high-pressure evaporator in the steam injection boiler of the present utility model.
Figure signs 1-the burner 2-the furnace 3-the outlet flue 4-the high-pressure steam drum 41-the net segment 42-the salt segment 43-the steam outlet
5-the net segment high-pressure evaporator
6-the high-pressure superheater
7-the salt segment high-pressure evaporator
8-the high-pressure economizer
9-the flue gas duct 10- the baffle 11-the communicating pipe 12-the feed pipe 121-the vertical section 122-the horizontal section 13-the cyclone separator 14-the secondary efficient steam-water separator 15-the level gauge 16-the air preheater 17-the net segment downcomer 18-the salt segment downcomer 19-the fuel pipe Best Mode for Carrying out the Utility Model Hereinafter, the present utility model is further described in details by way of its specific embodiments with reference to the accompanying drawings, but the description does not serve as a limitation to the present utility model.
As shown in FIG.1 and FIG.2, the steam injection boiler disclosed by the embodiment of the present utility model comprises a burner 1, a furnace 2, an outlet flue 3, and a high-pressure steam drum 4, wherein the furnace 2 is provided with a net segment high-pressure evaporator 5, a high-pressure superheater 6, a salt segment high-pressure evaporator 7 and a high-pressure economizer 8; the burner 1 is provided at the front end of the furnace 2, and the outlet flue 3 is provided at the tail end of the furnace 2; the high-pressure steam drum 4 is divided into a net segment 41 and salt segments 42, wherein the high-pressure feedwater of the net segment 41 enters into the net segment high-pressure evaporator 5 through a net segment downcomer 17, and the net segment high-pressure evaporator 5 is used for evaporation in the net segment.
The evaporation amount of the net segment 41 is 70% to 80% of the total evaporation amount. Water in the salt segment 42 enters into the salt segment high-pressure evaporator 7 through a salt segment downcomer 18, and the evaporation amount of the salt segments 42 is 20% to 30% of the total evaporation amount. A steam outlet 43 of the high-pressure steam drum 4 is connected to the high-pressure superheater 6; the high-pressure economizer 8 is located at the tail part of the furnace 2, for preheating the high-pressure feedwater entering into the salt segment 42 of the high-pressure steam drum 4. The high-pressure steam drum of the steam injection boiler of the present utility model is divided into a net segment and salt segments, thereby decreasing the requirement for the water mineralization (i.e. salt content) of the high-pressure feedwater and making it possible to directly use the water from heavy oil recovery. In addition, the steam generated from evaporations in the salt segments and the net segment reenters into the high-pressure superheater to form superheated steam, and the use of the superheated steam in heavy oil recovery can improve efficiency of oil recovery.
With reference to FIG. 1 again. the net segment high-pressure evaporator 5 is closer to the burner 1 than the high-pressure superheater 6 and the salt segment high-pressure evaporator 7, so that the flue gas in furnace 2 first passes through the net segment high-pressure evaporator 5, and then passes through the high-pressure superheater 6 and the salt segment high-pressure evaporator 7. That is, the net segment high-pressure evaporator 5 is located in an area of relatively high temperature, while the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 are located in areas of relatively low temperature. The net segment high-pressure evaporator 5 decreases the temperature of the flue gas in the furnace 2 by means of absorbing heat by evaporation (the arrows arranged in a horizontal row in FIG. 1 indicate the flow direction of the flue gas), making the temperature of the flue gas in the area of the high-pressure superheater 6 below the permitted level of the material, to ensure the high-pressure superheater 6 working in a safe temperature range. In addition, since the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 need to be maintained more frequently than the net segment high-pressure evaporator 5, the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 are arranged in areas easy for service, i.e.
preferably not in the middle of any device but closer to the end portion of the furnace 2, so that they can be assembled and disassembled without the influence of any other devices during service. As FIG. 1 is a schematic plane view, the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 as viewed from FIG. 1 are arranged among other devices, in fact, all the devices are arranged staggered rather than in a row.
As shown in FIG. 1, the fuel goes into the burner 1 through a fuel pipe 19, and meanwhile. air is also fed into the burner 1 for helping combustion. In addition, a flue gas duct 9 is connected between the outlet flue 3 and the air duct inlet of the burner 1, and the flue gas duct 9 is used for injecting the flue gas into the furnace 2 through the air duct inlet. Because the flue gas coming out from the outlet flue 3 has a low temperature and low oxygen content, injecting flue gas of low temperature and low oxygen content into the furnace 2 can decrease the temperature and the oxygen content in the combustion zone and inhibit the generation of oxynitride during combustion, thereby reducing environmental pollution, meeting the environmental requirements and ensuring normal operation of production.
As shown in FIG.2, the lower portion of the high-pressure steam drum 4 in this embodiment is separated into a net segment 41 and salt segments 42 by providing a baffle 10 at the bottom of the high-pressure steam drum 4, and the upper portion thereof is communicated, that is, the lower end of the baffle 10 is connected to the bottom of the high-pressure steam drum 4 and the upper end of the baffle 10 does not extend to the top of the high-pressure steam drum 4. A communicating pipe 11 for communicating the net segment 41 and the salt segments 42 is provided penetrating through the baffle 10, and the communicating pipe 11 is close to the lower end of the baffle 10, namely, the communicating pipe 11 is close to the bottom of the high-pressure steam drum 4, so that water of higher salt content in the net segment 41 goes into the salt segments 42 through the communicating pipe 11. According to the characteristics of the boiler, the salt segments 42 are arranged on both sides of the high-pressure steam drum 4, which helps maintaining uniform distribution of working loads and stable water circulation in the salt segments 42. Therefore, in the present embodiment, the net segment 41 is one section and the salt segments 42 are two sections respectively located on both sides of the net segment 41. Please see FIG.2 for details.
With further reference to FIG. 2, the high-pressure feedwater goes into the net segment 41 of the high-pressure steam drum 4 through a feed pipe 12 which comprises a vertical section 121 penetrating through the housing of the high-pressure steam drum 4 and a horizontal section 122 arranged at the bottom of the net segment 41 of the high-pressure steam drum 4, wherein a plurality of short outlet pipes (not shown in the figure) which communicate with the horizontal section 122 are provided on the horizontal section 122, and the openings of the short outlet pipes face towards the top of the high-pressure steam drum 4, namely, the short outlet pipes are perpendicular to the horizontal section 122 and are parallel to the vertical section 121, besides, the short outlet pipes are close to the middle of the bottom, namely, no short outlet pipe is provided at the areas close to the baffle 10, in order to prevent the water ejected from the short outlet pipes from disturbing the dead water area near the baffle
As shown in FIG.1 and FIG.2, the steam injection boiler disclosed by the embodiment of the present utility model comprises a burner 1, a furnace 2, an outlet flue 3, and a high-pressure steam drum 4, wherein the furnace 2 is provided with a net segment high-pressure evaporator 5, a high-pressure superheater 6, a salt segment high-pressure evaporator 7 and a high-pressure economizer 8; the burner 1 is provided at the front end of the furnace 2, and the outlet flue 3 is provided at the tail end of the furnace 2; the high-pressure steam drum 4 is divided into a net segment 41 and salt segments 42, wherein the high-pressure feedwater of the net segment 41 enters into the net segment high-pressure evaporator 5 through a net segment downcomer 17, and the net segment high-pressure evaporator 5 is used for evaporation in the net segment.
The evaporation amount of the net segment 41 is 70% to 80% of the total evaporation amount. Water in the salt segment 42 enters into the salt segment high-pressure evaporator 7 through a salt segment downcomer 18, and the evaporation amount of the salt segments 42 is 20% to 30% of the total evaporation amount. A steam outlet 43 of the high-pressure steam drum 4 is connected to the high-pressure superheater 6; the high-pressure economizer 8 is located at the tail part of the furnace 2, for preheating the high-pressure feedwater entering into the salt segment 42 of the high-pressure steam drum 4. The high-pressure steam drum of the steam injection boiler of the present utility model is divided into a net segment and salt segments, thereby decreasing the requirement for the water mineralization (i.e. salt content) of the high-pressure feedwater and making it possible to directly use the water from heavy oil recovery. In addition, the steam generated from evaporations in the salt segments and the net segment reenters into the high-pressure superheater to form superheated steam, and the use of the superheated steam in heavy oil recovery can improve efficiency of oil recovery.
With reference to FIG. 1 again. the net segment high-pressure evaporator 5 is closer to the burner 1 than the high-pressure superheater 6 and the salt segment high-pressure evaporator 7, so that the flue gas in furnace 2 first passes through the net segment high-pressure evaporator 5, and then passes through the high-pressure superheater 6 and the salt segment high-pressure evaporator 7. That is, the net segment high-pressure evaporator 5 is located in an area of relatively high temperature, while the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 are located in areas of relatively low temperature. The net segment high-pressure evaporator 5 decreases the temperature of the flue gas in the furnace 2 by means of absorbing heat by evaporation (the arrows arranged in a horizontal row in FIG. 1 indicate the flow direction of the flue gas), making the temperature of the flue gas in the area of the high-pressure superheater 6 below the permitted level of the material, to ensure the high-pressure superheater 6 working in a safe temperature range. In addition, since the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 need to be maintained more frequently than the net segment high-pressure evaporator 5, the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 are arranged in areas easy for service, i.e.
preferably not in the middle of any device but closer to the end portion of the furnace 2, so that they can be assembled and disassembled without the influence of any other devices during service. As FIG. 1 is a schematic plane view, the high-pressure superheater 6 and the salt segment high-pressure evaporator 7 as viewed from FIG. 1 are arranged among other devices, in fact, all the devices are arranged staggered rather than in a row.
As shown in FIG. 1, the fuel goes into the burner 1 through a fuel pipe 19, and meanwhile. air is also fed into the burner 1 for helping combustion. In addition, a flue gas duct 9 is connected between the outlet flue 3 and the air duct inlet of the burner 1, and the flue gas duct 9 is used for injecting the flue gas into the furnace 2 through the air duct inlet. Because the flue gas coming out from the outlet flue 3 has a low temperature and low oxygen content, injecting flue gas of low temperature and low oxygen content into the furnace 2 can decrease the temperature and the oxygen content in the combustion zone and inhibit the generation of oxynitride during combustion, thereby reducing environmental pollution, meeting the environmental requirements and ensuring normal operation of production.
As shown in FIG.2, the lower portion of the high-pressure steam drum 4 in this embodiment is separated into a net segment 41 and salt segments 42 by providing a baffle 10 at the bottom of the high-pressure steam drum 4, and the upper portion thereof is communicated, that is, the lower end of the baffle 10 is connected to the bottom of the high-pressure steam drum 4 and the upper end of the baffle 10 does not extend to the top of the high-pressure steam drum 4. A communicating pipe 11 for communicating the net segment 41 and the salt segments 42 is provided penetrating through the baffle 10, and the communicating pipe 11 is close to the lower end of the baffle 10, namely, the communicating pipe 11 is close to the bottom of the high-pressure steam drum 4, so that water of higher salt content in the net segment 41 goes into the salt segments 42 through the communicating pipe 11. According to the characteristics of the boiler, the salt segments 42 are arranged on both sides of the high-pressure steam drum 4, which helps maintaining uniform distribution of working loads and stable water circulation in the salt segments 42. Therefore, in the present embodiment, the net segment 41 is one section and the salt segments 42 are two sections respectively located on both sides of the net segment 41. Please see FIG.2 for details.
With further reference to FIG. 2, the high-pressure feedwater goes into the net segment 41 of the high-pressure steam drum 4 through a feed pipe 12 which comprises a vertical section 121 penetrating through the housing of the high-pressure steam drum 4 and a horizontal section 122 arranged at the bottom of the net segment 41 of the high-pressure steam drum 4, wherein a plurality of short outlet pipes (not shown in the figure) which communicate with the horizontal section 122 are provided on the horizontal section 122, and the openings of the short outlet pipes face towards the top of the high-pressure steam drum 4, namely, the short outlet pipes are perpendicular to the horizontal section 122 and are parallel to the vertical section 121, besides, the short outlet pipes are close to the middle of the bottom, namely, no short outlet pipe is provided at the areas close to the baffle 10, in order to prevent the water ejected from the short outlet pipes from disturbing the dead water area near the baffle
10.
As shown in FIG.2, cyclone separators 13 are provided in the net segment 41 and the salt segments 42, respectively, and a secondary efficient steam-water separator 14 is provided at the top of the net segment which corresponds to the steam outlet 43.
The water contained in the steam which is generated from the net segment high-pressure evaporator 5 connected to the net segment 41 is separated therefrom by the cyclone separator 13 and the secondary efficient steam-water separator 14, so the salt content of the steam is dramatically decreased. The steam which is generated from the salt segment high-pressure evaporator 7 connected to the salt segment 42 is first steam-water seperated by the cyclone separator 13, and then enters into the secondary efficient steam-water separator 14 located above the net segement 41, to further separate the water contained in the steam so as to dramatically decrease the salt content of the steam, and the steam goes into the high-pressure superheater 6 through the steam outlet 43. After passing through the high-pressure superheater 6, the steam becomes superheated steam for use in steam injection thermal recovery of heavy oil. The steam injection boiler of the present utility model produces steam in an amount of 100t/h to 300t/h, having a temperature of 300 C to 350 C and a pressure of 9.8MPa to 13.7Mpa.
In addition, level gauges 15 for monitoring the height of the liquid level in the net segment 41 and the salt segments 42 are provided in the net segment 41 and the salt segments 42, respectively, and the feeding amount of the high-pressure feedwater in the net segment 41 and the sewage discharge at the salt segments 42 can be adjusted according to the height of the liquid level, to maintain the liquid level at proper height.
With further reference to FIG. 2, the high-pressure feedwater is ejected out upwards through the feed pipe 12 and the plurality of short outlet pipes connected thereto, and the net segment high-pressure evaporator 5 is connected to the lower part of the short outlet pipes; due to the relatively high outlet water pressure and water fluidity, the water entering into the net segment high-pressure evaporator 5 is substantially the water ejected from the short outlet pipes, while the water at the corners close to the baffle 10 of the net segment 41 has a relatively poor fluidity, and the water having high salt content from steam-water separation is gathered here.
Because the bottoms of the salt segments 42 and the net segment 41 are communicated by the communicating pipe 11, the water having a high salt content in the net segment 41 goes into the salt segments 42 and serves as the feedwater of the salt segments 42. A sewage outfall is provided at the bottoms of the salt segments 42, and the sewage will be discharged termly in the salt segments 42, whereas the sewage discharge rate is about 10%.
With further reference to FIG. 1, in order to improve the efficiency of the steam injection boiler, it further comprises an air preheater 16 that is provided at the tail part of the furnace 2, for preheating the air injected into the air duct inlet of the burner 1.
In order to reduce on-site installation workload and shorten the construction period, the furnace 2, the net segment high-pressure evaporator 5, the high-pressure superheater 6, the salt segment high-pressure evaporator 7 and the high-pressure economizer 8 and the air preheater 16 in the steam injection boiler of the present utility model are all prefabricated and modularized structures, and it is convenient for the transportation of these structures.
The representative embodiments of the present utility model have been described above in details. The detailed description is not used to limit the scope of the present utility model. A person skilled in the art may make various modifications or equivalent substitutions within the spirit and the protection scope of the present utility model, but these modifications or equivalent substitutions shall also be considered to fall within the protection scope of the present utility model. Thus, the combination of the characteristics in the foregoing detailed description is not necessary for carrying out the present utility model in the widest range, and alternatively teaches only the specifically-described representative embodiments of the present utility model. In addition, in order to obtain additional useful embodiments of the present utility model, all the different features in the specification which provide teachings can be combined in various ways, but these ways are not particularly exemplified.
As shown in FIG.2, cyclone separators 13 are provided in the net segment 41 and the salt segments 42, respectively, and a secondary efficient steam-water separator 14 is provided at the top of the net segment which corresponds to the steam outlet 43.
The water contained in the steam which is generated from the net segment high-pressure evaporator 5 connected to the net segment 41 is separated therefrom by the cyclone separator 13 and the secondary efficient steam-water separator 14, so the salt content of the steam is dramatically decreased. The steam which is generated from the salt segment high-pressure evaporator 7 connected to the salt segment 42 is first steam-water seperated by the cyclone separator 13, and then enters into the secondary efficient steam-water separator 14 located above the net segement 41, to further separate the water contained in the steam so as to dramatically decrease the salt content of the steam, and the steam goes into the high-pressure superheater 6 through the steam outlet 43. After passing through the high-pressure superheater 6, the steam becomes superheated steam for use in steam injection thermal recovery of heavy oil. The steam injection boiler of the present utility model produces steam in an amount of 100t/h to 300t/h, having a temperature of 300 C to 350 C and a pressure of 9.8MPa to 13.7Mpa.
In addition, level gauges 15 for monitoring the height of the liquid level in the net segment 41 and the salt segments 42 are provided in the net segment 41 and the salt segments 42, respectively, and the feeding amount of the high-pressure feedwater in the net segment 41 and the sewage discharge at the salt segments 42 can be adjusted according to the height of the liquid level, to maintain the liquid level at proper height.
With further reference to FIG. 2, the high-pressure feedwater is ejected out upwards through the feed pipe 12 and the plurality of short outlet pipes connected thereto, and the net segment high-pressure evaporator 5 is connected to the lower part of the short outlet pipes; due to the relatively high outlet water pressure and water fluidity, the water entering into the net segment high-pressure evaporator 5 is substantially the water ejected from the short outlet pipes, while the water at the corners close to the baffle 10 of the net segment 41 has a relatively poor fluidity, and the water having high salt content from steam-water separation is gathered here.
Because the bottoms of the salt segments 42 and the net segment 41 are communicated by the communicating pipe 11, the water having a high salt content in the net segment 41 goes into the salt segments 42 and serves as the feedwater of the salt segments 42. A sewage outfall is provided at the bottoms of the salt segments 42, and the sewage will be discharged termly in the salt segments 42, whereas the sewage discharge rate is about 10%.
With further reference to FIG. 1, in order to improve the efficiency of the steam injection boiler, it further comprises an air preheater 16 that is provided at the tail part of the furnace 2, for preheating the air injected into the air duct inlet of the burner 1.
In order to reduce on-site installation workload and shorten the construction period, the furnace 2, the net segment high-pressure evaporator 5, the high-pressure superheater 6, the salt segment high-pressure evaporator 7 and the high-pressure economizer 8 and the air preheater 16 in the steam injection boiler of the present utility model are all prefabricated and modularized structures, and it is convenient for the transportation of these structures.
The representative embodiments of the present utility model have been described above in details. The detailed description is not used to limit the scope of the present utility model. A person skilled in the art may make various modifications or equivalent substitutions within the spirit and the protection scope of the present utility model, but these modifications or equivalent substitutions shall also be considered to fall within the protection scope of the present utility model. Thus, the combination of the characteristics in the foregoing detailed description is not necessary for carrying out the present utility model in the widest range, and alternatively teaches only the specifically-described representative embodiments of the present utility model. In addition, in order to obtain additional useful embodiments of the present utility model, all the different features in the specification which provide teachings can be combined in various ways, but these ways are not particularly exemplified.
11
Claims (9)
1. A steam injection boiler, comprising:
a burner, a furnace, an outlet flue , a high-pressure steam drum, and a net segment high-pressure evaporator, a high-pressure superheater, wherein a salt segment high-pressure evaporator and a high-pressure economizer are provided in the furnace;
the burner is provided at a front end of the furnace, and the outlet flue is provided at a tail end of the furnace;
the high-pressure steam drum is divided into a net segment and a salt segment, the bottom of the net segment being connected to the net segment high-pressure evaporator by a net segment downcomer and the bottom of the salt segment being connected to the salt segment high-pressure evaporator by a salt segment downcomer;
a steam outlet of the high-pressure steam drum is connected to the high-pressure superheater; and the high-pressure economizer is located at the tail part of the furnace, for preheating high-pressure feedwater entering into the salt segment of the high-pressure steam drum; and wherein high-pressure feedwater goes into the net segment of the high-pressure steam drum through a feed pipe which comprises a vertical section penetrating through a housing of the high-pressure steam drum and a horizontal section provided at the bottom of the net segment of the high-pressure steam drum, and the horizontal section is provided with a plurality of short outlet pipes which are in communication with the horizontal section, and openings of the short outlet pipes face the top of the high-pressure steam drum.
a burner, a furnace, an outlet flue , a high-pressure steam drum, and a net segment high-pressure evaporator, a high-pressure superheater, wherein a salt segment high-pressure evaporator and a high-pressure economizer are provided in the furnace;
the burner is provided at a front end of the furnace, and the outlet flue is provided at a tail end of the furnace;
the high-pressure steam drum is divided into a net segment and a salt segment, the bottom of the net segment being connected to the net segment high-pressure evaporator by a net segment downcomer and the bottom of the salt segment being connected to the salt segment high-pressure evaporator by a salt segment downcomer;
a steam outlet of the high-pressure steam drum is connected to the high-pressure superheater; and the high-pressure economizer is located at the tail part of the furnace, for preheating high-pressure feedwater entering into the salt segment of the high-pressure steam drum; and wherein high-pressure feedwater goes into the net segment of the high-pressure steam drum through a feed pipe which comprises a vertical section penetrating through a housing of the high-pressure steam drum and a horizontal section provided at the bottom of the net segment of the high-pressure steam drum, and the horizontal section is provided with a plurality of short outlet pipes which are in communication with the horizontal section, and openings of the short outlet pipes face the top of the high-pressure steam drum.
2. The steam injection boiler according to claim 1, characterized in that the net segment high-pressure evaporator is closer to the burner than the high-pressure superheater and the salt segment high-pressure evaporator, so that the net segment high-pressure evaporator is located in a relatively high temperature area, and the high-pressure superheater and the salt segment high-pressure evaporator are located in relatively low temperature areas.
3. The steam injection boiler according to claim 1, characterized in that a flue pipe is connected between the outlet flue and an air duct inlet of the burner, for injecting the flue gas into the furnace through the air duct inlet.
4. The steam injection boiler according to claim 1, characterized in that a baffle is provided at the bottom of the high-pressure steam drum, dividing the lower portion of the high-pressure steam drum into the net segment and the salt segment, the upper portion of the high-pressure steam drum being communicated; and a communicating pipe for communicating the net segment and the salt segment is provided penetrating through the bottom of the baffle, so that water of higher salt content in the net segment goes into the salt segment through the communicating pipe.
5. The steam injection boiler according to claim 4, characterized in that the salt segments are two segments which are respectively located on both sides of the net segment.
6. The steam injection boiler according to claim 4, characterized in that cyclone separators are provided in the net segment and the salt segment, respectively, and a secondary high efficient steam-water separator is provided at the top of the net segment which corresponds to the steam outlet.
7. The steam injection boiler according to claim 4, characterized in that level gauges are provided in the net segment and in the salt segment, respectively.
8. The steam injection boiler according to claim 1, characterized in further comprising an air preheater which is provided at the tail part of the furnace, for preheating the air injected into an air duct inlet of the burner.
9. The steam injection boiler according to claim 8, characterized in that the furnace, the net segment high-pressure evaporator, the high-pressure superheater, the salt segment high-pressure evaporator, the high-pressure economizer and the air preheater are all in prefabricated and modularized structures.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520813320.9U CN205079206U (en) | 2015-10-19 | 2015-10-19 | Steam injecting boiler |
| CN201520813320.9 | 2015-10-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2917952A1 CA2917952A1 (en) | 2017-04-19 |
| CA2917952C true CA2917952C (en) | 2017-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2917952A Active CA2917952C (en) | 2015-10-19 | 2016-01-14 | Steam injection boiler |
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| Country | Link |
|---|---|
| CN (1) | CN205079206U (en) |
| CA (1) | CA2917952C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106978217A (en) * | 2017-04-19 | 2017-07-25 | 山西阳煤化工机械（集团）有限公司 | Water-coal-slurry water cooled wall gasification furnace HP steam drum |
| CN110762502A (en) * | 2019-10-25 | 2020-02-07 | 上海九荣环境能源科技有限公司 | Modular waste heat boiler heating surface and use method thereof |
| CN114034029A (en) * | 2021-10-28 | 2022-02-11 | 中冶南方工程技术有限公司 | Vaporization cooling system with high-loop control and enhanced steam-water separation and method thereof |
| CN114278958A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for steam injection boiler and steam injection boiler |
-
2015
- 2015-10-19 CN CN201520813320.9U patent/CN205079206U/en active Active
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2016
- 2016-01-14 CA CA2917952A patent/CA2917952C/en active Active
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| Publication number | Publication date |
|---|---|
| CN205079206U (en) | 2016-03-09 |
| CA2917952A1 (en) | 2017-04-19 |
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