CN117515515A - Boiler soft water supply and energy-saving combustion system - Google Patents
Boiler soft water supply and energy-saving combustion system Download PDFInfo
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- CN117515515A CN117515515A CN202311535229.0A CN202311535229A CN117515515A CN 117515515 A CN117515515 A CN 117515515A CN 202311535229 A CN202311535229 A CN 202311535229A CN 117515515 A CN117515515 A CN 117515515A
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- boiler
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- gas
- soft water
- flue gas
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- 239000008234 soft water Substances 0.000 title claims abstract description 83
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 42
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 118
- 239000001301 oxygen Substances 0.000 claims abstract description 118
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 117
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000003546 flue gas Substances 0.000 claims abstract description 95
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000007789 gas Substances 0.000 claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 88
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 56
- 239000001569 carbon dioxide Substances 0.000 claims description 43
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 43
- 239000000523 sample Substances 0.000 claims description 36
- 239000003345 natural gas Substances 0.000 claims description 26
- 238000000926 separation method Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 11
- 239000002918 waste heat Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000000779 smoke Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- -1 carbon dioxide Chemical compound 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Air Supply (AREA)
Abstract
The invention provides a boiler soft water supply and energy-saving combustion system, comprising: the boiler equipment, the deoxidization water tank, a first heat exchanger, the water softening device and the flue gas energy-saving device water softening device send soft water into the first heat exchanger through a first pipeline to exchange heat with high-temperature oxygen-containing water vapor discharged by the deoxidization water tank, soft water after absorbing heat and heating in the first heat exchanger flows into the flue gas energy-saving device through a second pipeline and exchanges heat with high-temperature flue gas discharged by the boiler equipment, soft water after absorbing heat again finally enters the deoxidization water tank and is heated to more than 100 ℃ to carry out thermal deoxidization, and soft water after deoxidization enters the boiler equipment. High-temperature oxygen-containing water vapor generated by the deoxidizing water tank enters the first heat exchanger through the third pipeline to exchange heat and condense the water vapor so as to form condensed water and high-temperature oxygen-containing gas. And feeding the high-temperature oxygen-containing gas into the boiler equipment through a fourth pipeline to mix with fuel. The invention can improve the energy-saving and environment-friendly level of boiler combustion and reduce the production cost of enterprises.
Description
Technical Field
The invention relates to the technical field of boiler energy conservation, in particular to a boiler soft water supply and energy-saving combustion system.
Background
The common boiler system is to mix natural gas and air and burn in the boiler liner, and the heat energy heats water in the boiler to generate steam for production and living use. Even if the clean energy source of natural gas is adopted, because the air contains a large amount of nitrogen and other various gases besides oxygen, the nitrogen can react with the oxygen at high temperature in the boiler furnace to generate nitrogen oxides, the higher the temperature is, the more nitrogen oxides are generated, the more harmful gases such as nitrogen oxides are contained in the discharged flue gas, and the more the pollution to the atmosphere and the environment is serious. Therefore, how to improve the soft water supply of the boiler is more energy-saving and environment-friendly has important significance.
Disclosure of Invention
The invention provides a soft water supply and energy-saving combustion system for a boiler, which solves the problems of more harmful gases such as nitrogen oxides and the like and more energy waste in the existing boiler combustion, can improve the energy-saving and environment-friendly level of the boiler combustion, and reduces the production cost of enterprises.
In order to achieve the above object, the present invention provides the following technical solutions:
a boiler soft water supply and energy saving combustion system comprising: boiler equipment, an deoxidizing water tank, a first heat exchanger, a water softening device and a flue gas energy-saving device;
the soft water device sends soft water into the first heat exchanger through a first pipeline to exchange heat with high-temperature oxygen-containing water vapor discharged by the deoxidizing water tank, soft water after absorbing heat and heating in the first heat exchanger flows into the flue gas energy-saving device through a second pipeline and exchanges heat with high-temperature flue gas discharged by the boiler equipment, soft water after absorbing heat again finally enters the deoxidizing water tank to be heated to more than 100 ℃ for thermal deoxidization, and the deoxidized soft water enters the boiler equipment;
high-temperature oxygen-containing water vapor generated by the deoxidizing water tank enters the first heat exchanger through a third pipeline to exchange heat and condense the water vapor so as to form condensed water and high-temperature oxygen-containing gas;
the first heat exchanger sends the high-temperature oxygen-containing gas into boiler equipment through a fourth pipeline to be mixed with fuel, and returns the condensed water into the deoxidizing water tank through a fifth pipeline.
Preferably, the boiler plant comprises: boiler, blower, oxygenerator and separator;
the air inlet duct of the boiler is provided with the separator, and the separator is used for carrying out gas-liquid separation on the gas entering the air inlet duct so as to dehumidify the gas entering the boiler;
the air blower is used for controlling the air inlet quantity and the air inlet pressure of the air inlet air channel, and the oxygen generator is used for manufacturing oxygen so that the gas entering the boiler is mainly mixed gas of oxygen and recovered flue gas, and the air consumption is reduced.
Preferably, the method further comprises: an oxygen content probe;
the boiler is connected with the flue gas energy-saving device through an exhaust flue, and the oxygen content probe is arranged on the exhaust flue and is used for detecting the oxygen content in the flue gas after combustion;
if the oxygen content is larger than a first set threshold value, judging that the gas entering the boiler is excessive, and reducing the rotating speed of the blower and/or the oxygen sending amount of the oxygen generator;
if the oxygen content is less than a second set threshold, it is determined that the boiler is insufficiently combusted, and the blower rotation speed and/or the oxygen supply amount of the oxygenerator need to be increased.
Preferably, the method further comprises: a second heat exchanger;
the flue gas energy-saving device is connected with the second heat exchanger through a sixth pipeline and exchanges heat with the natural gas flowing through the second heat exchanger, and then the natural gas after heat exchange is sent into the boiler for combustion;
the flue gas energy-saving device sends condensate water generated by flue gas cooling into the deoxidizing water tank through a pipeline.
Preferably, the method further comprises: a carbon dioxide treatment device;
the flue gas energy-saving device sends the flue gas subjected to heat exchange into an air inlet duct of the boiler for mixing, or sends the flue gas subjected to heat exchange into the carbon dioxide treatment device for industrial treatment.
Preferably, the exhaust port of the carbon dioxide treatment device is connected with the air inlet duct of the boiler through a pipeline, and carbon dioxide gas exhausted by the carbon dioxide treatment device is exhausted into the boiler for re-combustion.
Preferably, the method further comprises: a blower;
the fan is communicated with an air inlet channel of the boiler and used for controlling air supply of the boiler, and the fan is arranged at the rear of the separator so that gas sent by the fan is subjected to gas-liquid separation through the separator.
Preferably, the method further comprises: a cylinder;
the boiler is connected with the branch cylinder through a steam pipeline, and the branch cylinder is connected with the deoxidizing water tank through a seventh pipeline and is connected with the separator through an eighth pipeline;
the steam of the steam separation cylinder enters the deoxidizing water tank through the seventh pipeline for waste heat utilization, and the steam separation cylinder can selectively enter part of steam into the separator through the eighth pipeline for gas-liquid separation, so that the separated gas is sent to the boiler for waste heat utilization.
Preferably, the water softener includes: soft water equipment and soft water tanks;
the water softening device provides soft water for the water softening tank through a pipeline, and the water softening tank is connected with the first heat exchanger through a first pipeline.
The invention provides a boiler soft water supply and energy-saving combustion system, wherein a soft water device provides soft water, after sequentially carrying out heat exchange through a first heat exchanger and a flue gas energy saver, the soft water enters a deoxidizing water tank for heating and deoxidizing, and then the deoxidized soft water is sent into boiler equipment for steam production, so that the problems that the existing boiler burns and discharges more harmful gases such as nitrogen oxides and the like, and the energy is wasted are solved, the energy saving and environment-friendly level of the boiler combustion can be improved, and the production cost of enterprises is reduced.
Drawings
In order to more clearly illustrate the specific embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described.
Fig. 1 is a schematic view of a boiler soft water supply and energy-saving combustion system provided by the invention.
Fig. 2 is a schematic diagram of piping connection of a boiler soft water supply and energy-saving combustion system according to an embodiment of the present invention.
Detailed Description
In order to make the solution of the embodiment of the present invention better understood by those skilled in the art, the embodiment of the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Aiming at the problems that the existing boiler burns and discharges more harmful gases such as nitrogen and oxygen and the like and the energy is wasted, the invention provides a soft water supply and energy-saving combustion system for the boiler, which solves the problems that the existing boiler burns and discharges more harmful gases such as nitrogen oxides and the like and the energy is wasted, can improve the energy-saving and environment-friendly level of the boiler combustion and reduce the production cost of enterprises.
As shown in fig. 1 and 2, a boiler soft water supply and energy saving combustion system includes: boiler equipment, deoxidization water tank, first heat exchanger, water softener and flue gas energy-saving appliance. Soft water device is sent into through first pipeline S1 soft water first heat exchanger with the high temperature oxygen-containing steam that deoxidization water tank discharged carries out the heat exchange soft water after the heat absorption intensifies in the first heat exchanger flows into through second pipeline S2 the flue gas energy-saving appliance, and carries out the heat exchange with boiler equipment exhaust high temperature flue gas, and soft water after the heat absorption again gets into at last in the deoxidization water tank is heated to more than 100 ℃ and carries out thermal deoxidization, and the soft water after the deoxidization gets into boiler equipment. High-temperature oxygen-containing water vapor generated by the deoxidizing water tank enters the first heat exchanger through a third pipeline S3 to exchange heat and condense the water vapor so as to form condensed water and high-temperature oxygen-containing gas. The first heat exchanger sends the high-temperature oxygen-containing gas into boiler equipment through a fourth pipeline S4 to be mixed with fuel, and returns the condensed water into the deoxidizing water tank through a fifth pipeline S5.
Further, the boiler plant comprises: boiler, blower, oxygenerator and separator. The air inlet duct of the boiler is provided with the separator, and the separator is used for carrying out gas-liquid separation on the gas entering the air inlet duct so as to dehumidify the gas entering the boiler. The air blower is used for controlling the air inlet quantity and the air inlet pressure of the air inlet air channel, and the oxygen generator is used for manufacturing oxygen so that the gas entering the boiler is mainly mixed gas of oxygen and recovered flue gas, and the air consumption is reduced.
Specifically, soft water in the water softener enters the heat exchanger 13 through the pump group 8, the pipeline 9 and the electric valve 10 to exchange heat with high-temperature oxygen-containing gas discharged by the deoxidizing water tank 98, soft water after absorbing heat and raising temperature in the heat exchanger 13 flows out of the heat exchanger 13, enters the flue gas economizer 29 through the electric valve 12, the pipeline 11, the pipeline 16 and the electric valve 28 to exchange heat with high-temperature flue gas discharged by the boiler 93 again, and soft water after absorbing heat again in the flue gas economizer 29 enters the deoxidizing water tank 98 through the electric valve 27, the pipeline 25 and the electric valve 97. According to daltons partial pressure law, soft water is heated by steam to above 100 ℃ in the deoxidizing water tank 98 to thermally deoxidize, and oxygen in the soft water is removed in the deoxidizing water tank 98. The removed oxygen-containing gas in the soft water in the deoxidizing water tank 98 enters the heat exchanger 13 through the pipeline 19, the pipeline 17 and the electric valve 15 at the top to exchange heat with the soft water, so that the vapor in the oxygen-containing gas discharged by the deoxidizing water tank 98 is condensed, the condensed water in the heat exchanger 13 flows back into the deoxidizing water tank 98 through the pipeline 102, the pipeline 103 and the pipeline 100 at the bottom to be mixed with the soft water to be deoxidized, and the deoxidized high Wen Ruanshui in the deoxidizing water tank 98 enters the boiler 93 through the pipeline 97, the pump group 96, the pipeline 95 and the valve 94 at the bottom to be heated to generate steam for use. When the oxygen-containing gas discharged from the deoxidizing water tank 98 passes through the heat exchanger 13, the water vapor in the oxygen-containing gas is condensed, the purer oxygen-containing gas flows out of the heat exchanger 13, enters the separator 88 through the electric valve 14, the pipeline 101, the pipeline 92 and the pipeline 89, separates the condensed water again, and is mixed with oxygen or other gases produced by the oxygen generator 90 to be combusted with fuel gas. Therefore, the heat energy of the discharged oxygen-containing gas, the condensed water, and the oxygen-containing gas are fully utilized by the boiler 93 while deoxidizing the softened water.
The initial stage of the primary ignition operation of the boiler adopts air and natural gas for combustion, and after the boiler operates for a period of time, the air consumption is gradually reduced, and after oxygen manufactured by an oxygen generator with relatively low cost is mixed with flue gas, the oxygen always reaches the standard as the oxygen content of the air, and then the oxygen is combusted with the natural gas. Because the oxygen content and the atmosphere in the mixed gas of oxygen and flue gas are equivalent, and the main component of the flue gas is carbon dioxide gas with stable properties, the main component of the mixed gas is oxygen and carbon dioxide, and thus the boiler burner can adopt a common burner without specially manufacturing a pure oxygen burner or other burners. The method can not only not reduce the flame temperature, but also ensure the flame temperature, and the steam production capacity of the boiler can not be reduced. In addition, the flue gas and the boiler feed water are subjected to heat exchange, water vapor in the flue gas is condensed, the main component of discharged flue gas is carbon dioxide, and the flue gas is very pure and does not discharge other harmful gases.
The system further comprises: an oxygen content probe; the boiler is connected with the flue gas energy-saving device through an exhaust flue, and the oxygen content probe is arranged on the exhaust flue and used for detecting the oxygen content in the flue gas after combustion. If the oxygen content is greater than a first set threshold, determining that the gas entering the boiler is excessive, and reducing the rotating speed of the blower and/or the oxygen delivery amount of the oxygen generator is needed. If the oxygen content is less than a second set threshold, it is determined that the boiler is insufficiently combusted, and the blower rotation speed and/or the oxygen supply amount of the oxygenerator need to be increased.
Specifically, when the boiler 93 is operated, the flue gas discharged from the boiler 93 enters the flue gas economizer 29 through the flue 59 and the oxygen content probe 58 to exchange heat with soft water, and the soft water absorbs the heat of the flue gas, thereby reducing the temperature of the flue gas. Condensed water generated by cooling the flue gas in the flue gas economizer 29 flows into the deoxidizing water tank 98 through the pipelines 24, 26, 18 and 100 at the bottom to be mixed with soft water to be deoxidized thermally for the boiler 93 to use. The pressure probe 87 on the air duct detects the air quantity fed into the boiler, so that the natural gas has enough air, the oxygen content probe 58 on the air duct detects the oxygen content in the burnt flue gas, the oxygen content in the flue gas keeps a reasonable low value, and the air entering the boiler is too much because the oxygen content of the flue gas is too high, so that the boiler discharges more smoke, the heat of the boiler is more taken away by the flue gas, and if the oxygen content of the flue gas is too low, the boiler is easy to burn insufficiently, and energy is wasted. Therefore, the pressure probe 87 on the air duct and the content probe 58 on the flue can ensure that the fuel in the boiler is fully combusted, and the smoke discharge amount of the boiler is smaller under the corresponding load.
The system further comprises: a second heat exchanger; the flue gas energy-saving device is connected with the second heat exchanger through a sixth pipeline S6 and exchanges heat with natural gas flowing through the second heat exchanger, and then the natural gas after heat exchange is sent into the boiler for combustion. The flue gas energy-saving device sends condensate water generated by flue gas cooling into the deoxidizing water tank through a pipeline.
Specifically, the boiler burns natural gas with mixed gas of oxygen and flue gas. The temperature of the flue gas after the first heat exchange may be higher, but the temperature of the flue gas is very low from the combustible temperature of the natural gas, the temperature of the natural gas is lower, and the oxygen content in the flue gas is very low or even no oxygen is contained, so that the flue gas after the first temperature reduction flows out of the flue gas economizer 29 and enters the heat exchanger 30 to exchange heat with the natural gas through the flue 57, namely the natural gas enters the heat exchanger 30 through the valve 23 and the electric valve 22 to absorb heat energy of the flue gas, and the natural gas after the temperature rise enters the boiler burner to be mixed and combusted with air through the pressure probe 56, the electric valve 55, the pipeline 54, the pipeline 61 and the flowmeter 85, and the natural gas temperature involved in combustion is higher, so that the fuel is saved. After the flue gas is cooled again in the heat exchanger 30 and enters the flue 32 through the gas probe 31, as the main component of the flue gas is carbon dioxide, and the carbon dioxide is non-combustion gas, a part of the flue gas enters the separator 88 through the electric valve 44, the fan 45, the air duct 46, the air duct 47, the one-way valve 49, the air duct 69, the pressure probe 70 and the air duct 80, the baffle 78 and the baffle 79 are arranged in the separator 88 in a staggered manner, the moisture in the flue gas is separated and discharged, and the purer flue gas flows out of the separator 88 and enters the air duct 83 through the air duct 81 and the oxygen content probe 82. In order to improve the combustion efficiency of the boiler, and the flue gas discharged by the boiler does not contain harmful gases such as nitrogen oxides, oxygen generated by the oxygenerator 90 enters the air duct 83 through the electric valve 91 to be mixed with the flue gas, namely carbon dioxide, and the electric valve 76 can be automatically turned off even completely closed to stop supplying air to the boiler when the air quantity is sufficient. At this time, the ratio of oxygen and carbon dioxide in the air supplied to the boiler is adjusted to 20.9% by the oxygen content probe 82 and the oxygen content probe 84 on the air duct, namely, the air supplied to the boiler 93 is equivalent to the air, but the main components are only oxygen and carbon dioxide, so that the normal burner can normally operate, the residual heat of the flue gas is finally utilized, and the flue gas of the boiler 93 does not contain any harmful gas. The pressure probe 87 on the air duct detects the amount of air supplied to the boiler, so that the natural gas has enough air, namely, mixed gas of oxygen and carbon dioxide, and the oxygen content probe 82 and the oxygen content probe 84 adjust the proportion of the oxygen and the carbon dioxide to ensure that the oxygen content in the mixed gas is equal to that of the air, namely, 20.9 percent. The oxygen content probe 58 on the flue and the pressure probes 87, 82 and 84 on the air flue can ensure the sufficient combustion of the fuel in the boiler.
The system further comprises: a carbon dioxide treatment device; the flue gas energy-saving device sends the flue gas subjected to heat exchange into an air inlet duct of the boiler for mixing, or sends the flue gas subjected to heat exchange into the carbon dioxide treatment device for industrial treatment.
Further, the exhaust port of the carbon dioxide treatment device is connected with the air inlet duct of the boiler through a pipeline, and carbon dioxide gas exhausted by the carbon dioxide treatment device is exhausted into the boiler for re-combustion.
Specifically, the boiler may burn natural gas with a mixed gas of oxygen and carbon dioxide. After being cooled by the heat exchanger 30, the boiler flue gas passes through the gas probe 31 and the flue 32, and part of the flue gas enters the separator 88 after passing through the electric valve 44, the fan 45, the air duct 46, the air duct 47, the one-way valve 49, the air duct 69, the pressure probe 70 and the air duct 80, and then enters the boiler 93 after passing through the air duct 81, the oxygen content probe 82, the air duct 83, the oxygen content probe 84 and the blower 86. The rest of the redundant flue gas, namely carbon dioxide, enters the carbon dioxide equipment 38 through the flue 33, the flue 34 and the electric valve 37 after passing through the flue 32, and is made into low-temperature carbon dioxide liquid or dry ice required by industry, beverage, food and the like. When the boiler is ignited, no smoke is generated yet, and carbon dioxide liquid or dry ice produced by the carbon dioxide device 38 enters the carbon dioxide storage device 41 through the pipeline 39 and the electric valve 40 to be stored or transported to other places for use by a special vehicle. When no flue gas is generated at the initial stage of ignition of the boiler 93 or when no flue gas is used in operation, a part of carbon dioxide temporarily stored in the carbon dioxide storage device 41 can enter the fan 75 through the electric valve 42, the pipeline 43, the pipeline 48, the one-way valve 73 and the pipeline 74, enter the air duct 83 through the one-way valve 71, the air duct 81 and the oxygen content probe 82 to be mixed with oxygen produced by the oxygen generator 90, and enter the boiler 93 through the oxygen content probe 84 and the blower 86 to burn with natural gas after the oxygen content is consistent with the oxygen content in the air. The flue gas is made into carbon dioxide for industrial and beverage industries, and the boiler can not discharge any gas to the atmosphere, thereby being beneficial to environmental protection. If the carbon dioxide equipment fails, the redundant flue gas can not be made into carbon dioxide, and the flue gas can be discharged into the atmosphere through the electric valve 35 and the flue 36, and the flue gas discharged into the atmosphere does not contain harmful substances because the main component of the flue gas is pure carbon dioxide.
The system further comprises: a blower; the fan is communicated with an air inlet channel of the boiler and used for controlling air supply of the boiler, and the fan is arranged at the rear of the separator so that gas sent by the fan is subjected to gas-liquid separation through the separator.
Specifically, when the boiler 93 is ignited for the first time, natural gas and air are mixed for combustion after the boiler is subjected to a safe ignition process such as purging, namely, air can enter the fan 75 through the pipeline 77 and the electric valve 76, the air blown by the fan 75 enters the separator 88 through the air duct 72 and the one-way valve 71, and then enters the boiler 93 through the air duct 81, the oxygen content probe 82, the air duct 83, the oxygen content probe 84 and the pressure probe 87 and then enters the boiler 93 through the blower 86 for mixed combustion.
The system further comprises: a cylinder; the boiler is connected with the branch cylinder through a steam pipeline, and the branch cylinder is connected with the deoxidizing water tank through a seventh pipeline and is connected with the separator through an eighth pipeline; the steam of the steam separation cylinder enters the deoxidizing water tank through the seventh pipeline for waste heat utilization, and the steam separation cylinder can selectively enter part of steam into the separator through the eighth pipeline for gas-liquid separation, so that the separated gas is sent to the boiler for waste heat utilization.
Specifically, the boiler may burn natural gas with a mixed gas of oxygen and steam. Steam valve 62, pipe 60, pipe 53, valve 64 generated by boiler 93 enter sub-cylinder 63. A portion of the steam in the sub-cylinder 63 enters the deaeration water tank 98 via the valve 65, the pipe 52, the pipe 21, the pipe 20, and the electric valve 99 to heat the soft water therein for thermal deaeration. A portion of the vapor from the sub-cylinder 63 may be supplied to the process via valve 67 and conduit 51. When no flue gas is utilized or no carbon dioxide is available, even if the smoke returning equipment or the carbon dioxide equipment fails, the steam of the steam separation cylinder 63 can enter the separator 88 through the valve 66, the pipeline 50, the pressure reducing valve group 68, the air duct 69, the pressure probe 79 and the air duct 80, the separator 88 separates the moisture in the low-pressure steam, the dried low-pressure steam enters the air duct 83 through the air duct 81 and the oxygen content probe 82 to be mixed with the oxygen produced by the oxygenerator 90, and after the oxygen content is consistent with the oxygen content in the air, the oxygen enters the boiler 93 through the oxygen content probe 84 and the blower 86 to be burnt with the natural gas. Because the main component of the natural gas is methane, the main component generated after the methane is combusted is carbon dioxide and water vapor, and the main component of the generated flue gas is carbon dioxide and water vapor after the air consisting of oxygen and dry steam and the natural gas are combusted in the boiler. Therefore, when the moisture in the flue gas is condensed, discharged and utilized after the flue gas passes through the flue gas economizer 29 and the heat exchanger 30, the main component of the finally discharged flue gas is still purer carbon dioxide.
Further, the water softener includes: soft water equipment and soft water tanks; the water softening device provides soft water for the water softening tank through a pipeline, and the water softening tank is connected with the first heat exchanger through a first pipeline.
Specifically, soft water that water softening equipment 1 produced gets into soft water tank 3 through pump package 2, install oxygen content probe 4 and blast pipe 5 on the soft water tank 3, because the proportion of oxygen in the water with nitrogen gas is greater than the proportion of oxygen and nitrogen gas in the air, when oxygen content probe 4 detects that the oxygen content of soft water in soft water tank 3 does not reach saturated state or setting value, air-blower 6 blows fresh air into soft water tank 3 through pipeline 7 and mixes with soft water, improve the oxygen content of soft water in soft water tank 3, make the soft water oxygen content in the soft water tank 3 be in saturated state, and the unnecessary air is discharged into the atmosphere through blast pipe 5 after being inhaled by the soft water.
Therefore, the invention provides the boiler soft water supply and energy-saving combustion system, the soft water device provides soft water, after sequentially carrying out heat exchange through the first heat exchanger and the flue gas energy saver, the soft water enters the deoxidizing water tank for heating and deoxidizing, and then the deoxidized soft water is sent into boiler equipment for steam production, so that the problems that the existing boiler burns and discharges more harmful gases such as nitrogen oxides and the like, and the energy is wasted are solved, the energy saving and environment-friendly level of the boiler combustion can be improved, and the production cost of enterprises is reduced.
While the construction, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, the above description is only a preferred embodiment of the present invention, but the present invention is not limited to the embodiments shown in the drawings, and all changes made according to the concepts of the present invention or modifications as equivalent embodiments are within the scope of the present invention without departing from the spirit covered by the specification and drawings.
Claims (9)
1. A boiler soft water supply and energy saving combustion system, comprising: boiler equipment, an deoxidizing water tank, a first heat exchanger, a water softening device and a flue gas energy-saving device;
the soft water device sends soft water into the first heat exchanger through a first pipeline to exchange heat with high-temperature oxygen-containing water vapor discharged by the deoxidizing water tank, soft water after absorbing heat and heating in the first heat exchanger flows into the flue gas energy-saving device through a second pipeline and exchanges heat with high-temperature flue gas discharged by the boiler equipment, soft water after absorbing heat again finally enters the deoxidizing water tank to be heated to more than 100 ℃ for thermal deoxidization, and the deoxidized soft water enters the boiler equipment;
high-temperature oxygen-containing water vapor generated by the deoxidizing water tank enters the first heat exchanger through a third pipeline to exchange heat and condense the water vapor so as to form condensed water and high-temperature oxygen-containing gas;
the first heat exchanger sends the high-temperature oxygen-containing gas into boiler equipment through a fourth pipeline to be mixed with fuel, and returns the condensed water into the deoxidizing water tank through a fifth pipeline.
2. The boiler soft water supply and energy saving combustion system according to claim 1, wherein the boiler apparatus comprises: boiler, blower, oxygenerator and separator;
the air inlet duct of the boiler is provided with the separator, and the separator is used for carrying out gas-liquid separation on the gas entering the air inlet duct so as to dehumidify the gas entering the boiler;
the air blower is used for controlling the air inlet quantity and the air inlet pressure of the air inlet air channel, and the oxygen generator is used for manufacturing oxygen so that the gas entering the boiler is mainly mixed gas of oxygen and recovered flue gas, and the air consumption is reduced.
3. The boiler soft water supply and energy efficient combustion system of claim 2, further comprising: an oxygen content probe;
the boiler is connected with the flue gas energy-saving device through an exhaust flue, and the oxygen content probe is arranged on the exhaust flue and is used for detecting the oxygen content in the flue gas after combustion;
if the oxygen content is larger than a first set threshold value, judging that the gas entering the boiler is excessive, and reducing the rotating speed of the blower and/or the oxygen sending amount of the oxygen generator;
if the oxygen content is less than a second set threshold, it is determined that the boiler is insufficiently combusted, and the blower rotation speed and/or the oxygen supply amount of the oxygenerator need to be increased.
4. The boiler soft water supply and energy efficient combustion system of claim 3, further comprising: a second heat exchanger;
the flue gas energy-saving device is connected with the second heat exchanger through a sixth pipeline and exchanges heat with the natural gas flowing through the second heat exchanger, and then the natural gas after heat exchange is sent into the boiler for combustion;
the flue gas energy-saving device sends condensate water generated by flue gas cooling into the deoxidizing water tank through a pipeline.
5. The boiler soft water supply and energy efficient combustion system of claim 4, further comprising: a carbon dioxide treatment device;
the flue gas energy-saving device sends the flue gas subjected to heat exchange into an air inlet duct of the boiler for mixing, or sends the flue gas subjected to heat exchange into the carbon dioxide treatment device for industrial treatment.
6. The soft water supply and energy-saving combustion system of claim 5, wherein the discharge port of the carbon dioxide treatment device is connected to the air inlet duct of the boiler through a pipeline, and carbon dioxide gas discharged from the carbon dioxide treatment device is discharged into the boiler for re-combustion.
7. The boiler soft water supply and energy efficient combustion system of claim 6, further comprising: a blower;
the fan is communicated with an air inlet channel of the boiler and used for controlling air supply of the boiler, and the fan is arranged at the rear of the separator so that gas sent by the fan is subjected to gas-liquid separation through the separator.
8. The boiler soft water supply and energy efficient combustion system of claim 7, further comprising: a cylinder;
the boiler is connected with the branch cylinder through a steam pipeline, and the branch cylinder is connected with the deoxidizing water tank through a seventh pipeline and is connected with the separator through an eighth pipeline;
the steam of the steam separation cylinder enters the deoxidizing water tank through the seventh pipeline for waste heat utilization, and the steam separation cylinder can selectively enter part of steam into the separator through the eighth pipeline for gas-liquid separation, so that the separated gas is sent to the boiler for waste heat utilization.
9. The boiler soft water supply and energy saving combustion system according to claim 8, wherein the soft water device comprises: soft water equipment and soft water tanks;
the water softening device provides soft water for the water softening tank through a pipeline, and the water softening tank is connected with the first heat exchanger through a first pipeline.
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| CN202311535229.0A CN117515515A (en) | 2023-11-16 | 2023-11-16 | Boiler soft water supply and energy-saving combustion system |
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| CN202311535229.0A CN117515515A (en) | 2023-11-16 | 2023-11-16 | Boiler soft water supply and energy-saving combustion system |
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