CN112610947A - Secondary deoxygenation process for cogeneration water supply system - Google Patents
Secondary deoxygenation process for cogeneration water supply system Download PDFInfo
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- CN112610947A CN112610947A CN202011493007.3A CN202011493007A CN112610947A CN 112610947 A CN112610947 A CN 112610947A CN 202011493007 A CN202011493007 A CN 202011493007A CN 112610947 A CN112610947 A CN 112610947A
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- 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
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Abstract
The invention discloses a secondary deoxygenation process for a cogeneration water supply system, and relates to the technical field of secondary deoxygenation processes. The method comprises the following steps: the feed water enters the raw water heater through the pipeline, and the raw water heater heats the feed water; step two: the heated feed water enters a rotary film type low-pressure deaerator through a pipeline, and the rotary film type low-pressure deaerator heats the feed water and carries out preliminary deaerating; step three: the feed water heated by the rotary film type low-pressure deaerator and preliminarily deaerated is pressurized by a booster water pump. According to the invention, through the arranged rotary film type low-pressure deaerator, when the pressure in the rotary film type low-pressure deaerator reaches 0.02MPa in the heat supply peak, the rotary film type low-pressure deaerator heats the feed water to 104 ℃, simultaneously carries out primary deaerating on the feed water, reduces the oxygen content in the feed water to 15 mug/l, and heats the feed water and carries out secondary deaerating through the filler spray type high-pressure deaerator after the feed water is heated and primarily deaerated through the rotary film type low-pressure deaerator.
Description
Technical Field
The invention belongs to the technical field of secondary deoxidization processes, and particularly relates to a secondary deoxidization process of a cogeneration water supply system.
Background
The so-called feedwater deoxygenation means that when the feedwater is heated to boiling in a deoxygenator, the solubility of the gas in water decreases, allowing the gas to escape from the water and be vented to the atmosphere. The more used thermal deaerators are 0.12 MPa and 0.6 MPa according to the working pressure, water must be heated to the saturation temperature during thermal deaerating, and the surface area of deaerated water is large (such as a water spraying or atomizing dispersion device is adopted) so that the escaped gas can be rapidly discharged. Vacuum deoxygenation is often performed in a turbine condenser. Chemical deoxidization is to add hydrazine or sodium sulfite into water supply to further reduce the oxygen content in the water, wherein the water supply treatment refers to a process of improving the water quality of water which does not meet the water quality requirement of a water object, and raw water is subjected to processes of dosing, mixing reaction, precipitation (clarification), filtration, disinfection and the like to remove various harmful impurities contained in the raw water, so that the water which meets the water quality standard of life and production of people is obtained.
After the boiler feed water is heated by the raw water heater, the feed water temperature is continuously increased and deoxidated by 3 spraying filler type high-pressure deaerators, and then the feed water is heated by the high-pressure heater and then is supplied to the boiler.
The two-stage deoxygenation process needs 3 boilers to run at full load simultaneously when the heat supply peak is in the peak, and the two-stage deoxygenation device needs to supplement a large amount of normal-temperature demineralized water through the steam turbine condenser so as to maintain the deaerator and the boiler drum water level, so that the deoxygenation effect of the spray packing deaerator is reduced, the oxygen content of feed water exceeds the standard, potential safety hazards are brought to production and running, the service life of the boilers is shortened, and the production cost of deoxygenation is increased.
Disclosure of Invention
The invention aims to provide a secondary deoxygenation process for a cogeneration water supply system, which comprises the steps of heating feed water to 104 ℃ by a rotary film type low-pressure deoxygenator and simultaneously carrying out primary deoxygenation on the feed water by the rotary film type low-pressure deoxygenator when the pressure in the rotary film type low-pressure deoxygenator reaches 0.02MPa in a heat supply peak, reducing the oxygen content in the feed water to 15 mu g/l, heating and carrying out primary deoxygenation by the rotary film type low-pressure deoxygenator, then heating the feed water by a filler spray type high-pressure deoxygenator and carrying out secondary deoxygenation, ensuring that the oxygen content of the feed water is lower than 7 mu g/l under the full-load working condition of 3 boilers in the heat supply peak, ensuring the safe and stable operation of the boilers, prolonging the service life of the boilers, reducing the production cost of deoxygenation and solving the problems in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a two-stage deoxygenation process for a cogeneration water supply system comprises the following steps:
the method comprises the following steps: the feed water enters the raw water heater through the pipeline, and the raw water heater heats the feed water; step two: the heated feed water enters a rotary film type low-pressure deaerator through a pipeline, and the rotary film type low-pressure deaerator heats the feed water and carries out preliminary deaerating; step three: the feed water heated by the rotary film type low-pressure deaerator and preliminarily deaerated is pressurized by a booster water pump; step four: the pressurized feed water enters the deoxidizing and feeding mother pipe through a hot water pump for distribution; step five: the deaerating water feeding main pipe distributes the feed water into a three-spray packing type high-pressure deaerator for heating and secondary deaerating; step six: the feed water heated by the spray packing type high-pressure deaerator and secondarily deaerated is subjected to high-pressure heating by a high-pressure heater; step seven: the feed water heated by the high pressure heater enters the boiler through a pipeline.
Optionally, the rotary-film low-pressure deaerator heats the feed water to 104 ℃ under the working pressure of 0.02MPa, and reduces the oxygen content of the feed water to 15 mug/l.
Optionally, the spray packed high pressure deaerator reduces the oxygen content in the feed water to below 7 μ g/l.
Optionally, the rated flow rates of the two hot water pumps are 229t/h and 320t/h respectively, and the three boilers are all 180t/h pulverized coal boilers.
Optionally, the rotary film low pressure deaerator comprises: the deoxidization water tank, the upside of deoxidization water tank is provided with the oxygen-eliminating tower, and relief valve interface, two gas ports are installed to the tip of oxygen-eliminating tower, and the relief valve interface is located between two gas ports.
Optionally, the deoxygenating water tank comprises: the water level meter comprises a first connecting piece and a second connecting piece, wherein a first barrel is arranged between the first connecting piece and the second connecting piece, a water level meter interface and a water filling port are arranged on one side of the first connecting piece, the water level meter interface is located above the water filling port, and an inlet hole is formed in one side of the second connecting piece.
Optionally, the upper end of the first barrel is provided with a vent, a water pump return port and a gas balance pipe, the deaerating tower is located between the gas balance pipe and the vent, and the vent is located between the deaerating tower and the water pump return port.
Optionally, the lower end of the first cylinder is provided with a water balance pipe, a water drain pipe, a deaerated water outlet, a strengthened heat exchange device interface and two support legs, the strengthened heat exchange device interface is located between the water drain pipe and the deaerated water outlet, and the water drain pipe, the deaerated water outlet and the strengthened heat exchange device interface are located between the two support legs.
Optionally, the oxygen removal tower comprises: the second cylinder body is communicated with the deoxidizing water tank, a third connecting piece is installed on the upper side of the second cylinder body, and the safety valve connector and the two exhaust ports are installed on one side of the third connecting piece.
Optionally, a condensation water port, a high-pressure water drain port, a water supply port, an upper heating steam port and a lower heating steam port are arranged on the periphery of the second cylinder.
The embodiment of the invention has the following beneficial effects:
according to one embodiment of the invention, through the arranged rotary film type low-pressure deaerator, when the pressure in the rotary film type low-pressure deaerator reaches 0.02MPa in a heat supply peak, the rotary film type low-pressure deaerator heats the feed water to 104 ℃, simultaneously carries out primary deaerating on the feed water, reduces the oxygen content in the feed water to 15 mu g/l, and after the rotary film type low-pressure deaerator heats and carries out primary deaerating, the feed water is heated and carries out secondary deaerating through the filler spray type high-pressure deaerator, so that the oxygen content of the feed water is lower than 7 mu g/l under the full-load working condition of 3 boilers in the heat supply peak, the safe and stable operation of the boilers is ensured, the service life of the boilers is prolonged, and the production cost of deaerat.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a two-stage oxygen removal process flow according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a rotary film type low-pressure deaerator according to an embodiment of the present invention;
FIG. 3 is a schematic view of a safety valve interface according to an embodiment of the present invention;
fig. 4 is a schematic view of a lower heating steam port according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
Referring to fig. 1-4, in the present embodiment, a secondary oxygen removal process for a cogeneration water supply system is provided, which includes the following steps:
the method comprises the following steps: the feed water enters the raw water heater through the pipeline, and the raw water heater heats the feed water; step two: the heated feed water enters a rotary film type low-pressure deaerator through a pipeline, and the rotary film type low-pressure deaerator heats the feed water and carries out preliminary deaerating; step three: the feed water heated by the rotary film type low-pressure deaerator and preliminarily deaerated is pressurized by a booster water pump; step four: the pressurized feed water enters the deoxidizing and feeding mother pipe through a hot water pump for distribution; step five: the deaerating water feeding main pipe distributes the feed water into a three-spray packing type high-pressure deaerator for heating and secondary deaerating; step six: the feed water heated by the spray packing type high-pressure deaerator and secondarily deaerated is subjected to high-pressure heating by a high-pressure heater; step seven: the feed water heated by the high pressure heater enters the boiler through a pipeline.
The application of one aspect of the embodiment is as follows: when needs are to feedwater second grade deoxidization, feedwater heats through living water heater, then the deoxidation is carried out through flowing into the rotating film formula low pressure oxygen-eliminating device to the feedwater, feedwater is in the jellyfish pipe on the deoxidization through hot-water pump inflow after the rotating film formula low pressure oxygen-eliminating device deoxidization, then feedwater is in the jellyfish pipe flow in the deoxidization and is heated and secondary deoxidization of spraying filler formula high pressure oxygen-eliminating device, at last feedwater is heated and flow into in the boiler after the secondary deoxidization flows into high pressure heater reheating behind the spraying filler formula high pressure oxygen-eliminating device, thereby accomplish the second grade deoxidization of feedwater. The electric equipment can be powered by a storage battery or an external power supply.
Through the rotary film type low pressure oxygen-eliminating device who sets up, when the heat supply peak, when pressure in the rotary film type low pressure oxygen-eliminating device reached 0.02MPa, rotary film type low pressure oxygen-eliminating device will feed water heating to 104 ℃, simultaneously carry out preliminary deoxidization to the feed water, reduce the oxygen content in the feed water to 15 mug/l, after rotary film type low pressure oxygen-eliminating device heating and preliminary deoxidization, heat and the second grade deoxidization to the feed water by packing atomizing high pressure oxygen-eliminating device again, ensure that the oxygen content is less than 7 mug/l under the 3 boiler full load operating conditions of heat supply peak, guarantee boiler safety and stability moves, the life of boiler has been increased, the manufacturing cost of deoxidization has been reduced.
The rotary-film low-pressure deaerator of the embodiment heats the feed water to 104 ℃ under the working pressure of 0.02MPa, and reduces the oxygen content of the feed water to 15 mug/l.
The spray packing type high-pressure deaerator of the embodiment reduces the oxygen content in the feed water to below 7 mug/l.
The rated flow rates of the two hot water pumps of the embodiment are 229t/h and 320t/h respectively, and the three boilers are all 180t/h pulverized coal boilers.
The rotary film type low-pressure deaerator of the present embodiment includes: deoxidization water tank 1, the upside of deoxidization water tank 1 is provided with deoxidization tower 2, and relief valve interface 16, two gas vent 17 are installed to the tip of deoxidization tower 2, and relief valve interface 16 is located between two gas vent 17.
The deaerating water tank 1 of the present embodiment includes: first connecting piece 21, second connecting piece 22, install first barrel between first connecting piece 21 and the second connecting piece 22, one side of first connecting piece 21 is provided with fluviograph interface 15, water filling port 20, and fluviograph interface 15 is located the top of water filling port 20, and one side of second connecting piece 22 is provided with hand-hole 14.
The upper end of the first barrel of this embodiment is provided with vent 7, water pump return water mouth 8, air balance pipe 9, and the oxygen-eliminating tower 2 is located between air balance pipe 9 and vent 7, and vent 7 is located between oxygen-eliminating tower 2 and water pump return water mouth 8.
The lower tip of the first barrel of this embodiment is provided with water balance pipe 10, bleeder 11, the export 12 of the oxygen-removed water, intensive heat transfer device interface 18, two stabilizer blades 13, and intensive heat transfer device interface 18 is located between bleeder 11 and the export 12 of the oxygen-removed water, and bleeder 11, the export 12 of the oxygen-removed water, intensive heat transfer device interface 18 all are located between two stabilizer blades 13.
The oxygen eliminating tower 2 of the present embodiment includes: and the second cylinder is communicated with the deoxygenation water tank 1, a third connecting piece 23 is arranged on the upper side of the second cylinder, and the safety valve interface 16 and the two air outlets 17 are arranged on one side of the third connecting piece 23.
In this embodiment, a condensation water port 3, a high-pressure steam drain port 4, a water supply port 5, an upper heating steam port 6, and a lower heating steam port 19 are provided on the periphery of the second cylinder.
The above embodiments may be combined with each other.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Claims (10)
1. A two-stage deoxygenation process for a cogeneration water supply system is characterized by comprising the following steps of:
the method comprises the following steps: the feed water enters the raw water heater through the pipeline, and the raw water heater heats the feed water;
step two: the heated feed water enters a rotary film type low-pressure deaerator through a pipeline, and the rotary film type low-pressure deaerator heats the feed water and carries out preliminary deaerating;
step three: the feed water heated by the rotary film type low-pressure deaerator and preliminarily deaerated is pressurized by a booster water pump;
step four: the pressurized feed water enters the deoxidizing and feeding mother pipe through a hot water pump for distribution;
step five: the deaerating water feeding main pipe distributes the feed water into a three-spray packing type high-pressure deaerator for heating and secondary deaerating;
step six: the feed water heated by the spray packing type high-pressure deaerator and secondarily deaerated is subjected to high-pressure heating by a high-pressure heater;
step seven: the feed water heated by the high pressure heater enters the boiler through a pipeline.
2. The secondary deoxygenation process of claim 1, wherein the rotary-film low-pressure deoxygenator is capable of heating the feed water to 104 ℃ and reducing the oxygen content of the feed water to 15 μ g/l at an operating pressure of 0.02 MPa.
3. The secondary deoxygenation process of claim 1 wherein the oxygen content in the feed water is reduced to below 7 μ g/l by a spray packed high pressure deoxygenator.
4. The secondary oxygen removal process of a cogeneration water supply system of claim 1, wherein the rated flow rates of the two hot water pumps are 229t/h and 320t/h respectively, and the three boilers are all 180t/h pulverized coal boilers.
5. The secondary deoxygenation process of claim 1 wherein the rotary-film low-pressure deoxygenator comprises: deoxidization water tank (1), the upside of deoxidization water tank (1) is provided with oxygen-eliminating tower (2), and relief valve interface (16), two exhaust ports (17) are installed to the tip of oxygen-eliminating tower (2), and relief valve interface (16) are located between two exhaust ports (17).
6. The secondary deoxygenation process of a cogeneration water supply system of claim 5, wherein the deoxygenation water tank (1) comprises: the water level meter comprises a first connecting piece (21) and a second connecting piece (22), a first barrel is installed between the first connecting piece (21) and the second connecting piece (22), a water level meter interface (15) and a water filling port (20) are arranged on one side of the first connecting piece (21), the water level meter interface (15) is located above the water filling port (20), and an inlet hole (14) is formed in one side of the second connecting piece (22).
7. The secondary deoxygenation process of the cogeneration water supply system of claim 6, wherein the upper end of the first cylinder is provided with a vent (7), a water pump return port (8) and an air balance pipe (9), the deoxygenation tower (2) is positioned between the air balance pipe (9) and the vent (7), and the vent (7) is positioned between the deoxygenation tower (2) and the water pump return port (8).
8. The secondary deoxygenation process of the cogeneration water supply system of claim 7, wherein the lower end of the first cylinder is provided with a water balance pipe (10), a water discharge pipe (11), a deoxygenated water outlet (12), a strengthened heat exchange device interface (18) and two support legs (13), the strengthened heat exchange device interface (18) is positioned between the water discharge pipe (11) and the deoxygenated water outlet (12), and the water discharge pipe (11), the deoxygenated water outlet (12) and the strengthened heat exchange device interface (18) are positioned between the two support legs (13).
9. The secondary deoxygenation process of cogeneration feedwater system of claim 5, wherein the deoxygenation tower (2) comprises: the second cylinder is communicated with the deoxygenation water tank (1), a third connecting piece (23) is installed on the upper side of the second cylinder, and a safety valve interface (16) and two exhaust ports (17) are installed on one side of the third connecting piece (23).
10. The secondary deoxygenation process of the cogeneration water supply system of claim 9, wherein the second cylinder is provided with a condensation water port (3), a high heating and water draining port (4), a water supply port (5), an upper heating steam port (6) and a lower heating steam port (19) on the periphery.
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| CN202011493007.3A CN112610947A (en) | 2020-12-17 | 2020-12-17 | Secondary deoxygenation process for cogeneration water supply system |
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| CN202011493007.3A CN112610947A (en) | 2020-12-17 | 2020-12-17 | Secondary deoxygenation process for cogeneration water supply system |
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| US4535593A (en) * | 1981-08-28 | 1985-08-20 | Hitachi, Ltd. | Method of and apparatus for warming high-pressure feed water heaters for power plants |
| CN201272697Y (en) * | 2008-08-13 | 2009-07-15 | 唐山三友热电有限责任公司 | Deoxidization apparatus for water used in generator set |
| CN103292311A (en) * | 2013-05-31 | 2013-09-11 | 际华三五三九制鞋有限公司 | Heat filler type deaerator with stable deaerating function and atomizing function |
| CN205065687U (en) * | 2015-09-09 | 2016-03-02 | 济宁市鲁泉水处理有限公司 | Revolving -film deaerator |
| CN108534127A (en) * | 2018-03-27 | 2018-09-14 | 上海金联热电有限公司 | A kind of boiler supply water deaerating system |
| CN108626715A (en) * | 2017-03-24 | 2018-10-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Heat regenerative system equipped with multistage deaerator |
| CN208871597U (en) * | 2018-09-28 | 2019-05-17 | 唐山三友化工股份有限公司 | A kind of power plant's high and low pressure oxygen-eliminating device joint dead steam recovery system |
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2020
- 2020-12-17 CN CN202011493007.3A patent/CN112610947A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4535593A (en) * | 1981-08-28 | 1985-08-20 | Hitachi, Ltd. | Method of and apparatus for warming high-pressure feed water heaters for power plants |
| CN201272697Y (en) * | 2008-08-13 | 2009-07-15 | 唐山三友热电有限责任公司 | Deoxidization apparatus for water used in generator set |
| CN103292311A (en) * | 2013-05-31 | 2013-09-11 | 际华三五三九制鞋有限公司 | Heat filler type deaerator with stable deaerating function and atomizing function |
| CN205065687U (en) * | 2015-09-09 | 2016-03-02 | 济宁市鲁泉水处理有限公司 | Revolving -film deaerator |
| CN108626715A (en) * | 2017-03-24 | 2018-10-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Heat regenerative system equipped with multistage deaerator |
| CN108534127A (en) * | 2018-03-27 | 2018-09-14 | 上海金联热电有限公司 | A kind of boiler supply water deaerating system |
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