CN108731004B - Circulating cooling device of water-cooled grate and waste incineration power generation device - Google Patents
Circulating cooling device of water-cooled grate and waste incineration power generation device Download PDFInfo
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- CN108731004B CN108731004B CN201810522837.0A CN201810522837A CN108731004B CN 108731004 B CN108731004 B CN 108731004B CN 201810522837 A CN201810522837 A CN 201810522837A CN 108731004 B CN108731004 B CN 108731004B
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- water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23H—GRATES; CLEANING OR RAKING GRATES
- F23H3/00—Grates with hollow bars
- F23H3/02—Grates with hollow bars internally cooled
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
The invention provides circulating cooling devices of water-cooled grates and a waste incineration power generation device, wherein the circulating cooling devices of the water-cooled grates comprise grate cooling water pumps used for pumping circulating cooling water into the water-cooled grates to cool the water-cooled grates, air preheaters used for heating air by utilizing the circulating cooling water introduced by the water-cooled grates, grate water heat exchangers used for heating condensed water by utilizing the circulating cooling water introduced by the water-cooled grates, and distribution units used for controlling the quantity of the circulating cooling water introduced into the air preheaters and the grate water heat exchangers by the water-cooled grates.
Description
Technical Field
The invention relates to a water-cooled grate cooling technology, in particular to a circulating cooling device of water-cooled grates and a garbage incineration power generation device.
Background
The heat value of the municipal solid waste is higher and higher with the increase of the proportion of domestic waste incineration, because the classification of the municipal solid waste is more and more perfect in aspect, the kitchen ingredients in the household waste are less and less, in addition, aspect, the demand of harmless disposal of the industrial waste generated in cities is more and more large, and the general heat value of the industrial waste is higher, the combustion temperature is high and the material layer is thin when the high heat value waste is incinerated, the problem of over-temperature of the fire grate can exist when the traditional air cooling incinerator fire grate is adopted, the service life of the fire grate segments is greatly reduced, the water cooling fire grate suitable for the high heat waste incinerator cools the fire grate segments of the incinerator through an independent circulating cooling water system, the temperature of the fire grate segments is always controlled below 100 ℃, and the water cooling.
The circulating cooling water system of the water-cooled grate, low-temperature water is sent into the water-cooled grate through the water pump, the temperature of the low-temperature water rises to become high-temperature water after passing through the water-cooled grate, the high-temperature water is cooled by passing through heat exchangers and then becomes low-temperature water, thus circulating to form the circulating cooling water system of the water-cooled grate, the heat of the circulating cooling water system of the water-cooled grate like at present is either fed into a times air preheater to improve the air temperature for times, or directly heats the condensed water to improve the water supply temperature, however, the method has the following defects:
1) when the heat value of the garbage is further increased by steps, the heat generated by the incinerator is increased, the heat of the circulating cooling water system is increased, and the heat of the air needing to be preheated times is greatly reduced, so that the heat of the circulating cooling water system cannot be fully utilized, and the energy is wasted.
2) If the heat of the circulating cooling water system heats the condensed water completely, the steam turbine room is far away from the boiler room, the loss of the pipeline is large, and the power consumption of the circulating cooling water system is large.
Accordingly, there is a need for an improved hydronic apparatus for water-cooled grates that overcomes the above-mentioned problems.
Disclosure of Invention
The concept of series in simplified form is introduced in the summary of the invention section, which is described in further detail in the detailed description section the summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to identify key features or essential features of the claimed subject matter.
To at least partially solve the above problems, an aspect of the present invention discloses a water-cooled grate circulation cooling device, comprising:
the grate cooling water pump is used for pumping circulating cooling water into the water-cooling grate to cool the water-cooling grate, and the temperature of the circulating cooling water is increased after the circulating cooling water passes through the water-cooling grate;
the air preheater is used for heating air by using circulating cooling water introduced by the water-cooling grate, and the temperature of the circulating cooling water is reduced and the circulating cooling water returns to the grate cooling water pump after heat exchange with the air in the air preheater is completed;
the furnace drainage heat exchanger is used for heating condensed water by using circulating cooling water led in by the water-cooling grate, and the temperature of the circulating cooling water is reduced and the circulating cooling water returns to the grate cooling water pump after the heat exchange with the condensed water in the furnace drainage heat exchanger is finished;
and the distribution unit is used for controlling the amount of circulating cooling water guided into the air preheater and the furnace drainage heat exchanger by the water-cooled grate.
In embodiments of the present invention, the dispensing unit includes a three-way regulating valve.
In order to at least partially solve the above problems, an aspect of the present invention discloses a waste incineration power generation device, comprising:
the garbage incinerator is internally provided with a water-cooled grate for incinerating garbage;
the waste heat boiler is used for heating boiler feed water by utilizing the smoke generated in the waste incinerator to form steam;
the steam turbine is used for utilizing the steam generated by the waste heat boiler to do work to drive the generator to generate electricity;
a condenser for condensing steam that performs work in the steam turbine to convert the steam into condensed water;
the grate cooling water pump is used for pumping circulating cooling water into the water-cooling grate to cool the water-cooling grate, and the temperature of the circulating cooling water is increased after the circulating cooling water passes through the water-cooling grate;
the air preheater is used for heating the air supplied to the garbage incinerator by using circulating cooling water introduced by the water-cooled grate so as to improve the temperature of the air, and the temperature of the circulating cooling water is reduced and returned to the grate cooling water pump after the heat exchange with the air in the air preheater is completed;
the furnace drainage heat exchanger is used for heating condensate water from the condenser by using circulating cooling water led in by the water-cooling grate so as to improve the temperature of the condensate water, the temperature of the circulating cooling water is reduced and the circulating cooling water returns to the grate cooling water pump after the heat exchange between the circulating cooling water and the condensate water in the furnace drainage heat exchanger is finished, and the condensate water is heated by the circulating cooling water and then is supplied to the waste heat boiler as boiler feed water for cyclic utilization;
and the distribution unit is used for controlling the amount of circulating cooling water guided into the air preheater and the furnace drainage heat exchanger by the water-cooled grate.
In embodiments of the present invention, the dispensing unit includes a three-way regulating valve.
In embodiments, the invention further comprises a condensed water pump arranged between the condenser and the furnace water-discharging heat exchanger for pumping the condensed water generated in the condenser to the furnace water-discharging heat exchanger.
In embodiments of the invention, the boiler further comprises a low pressure heater for heating the condensate water introduced by the grate water heat exchanger to form boiler feed water.
In embodiments of the present invention, the boiler further comprises a deaerator for removing gas contained in the boiler feed water introduced by the low pressure heater.
In embodiments of the invention, the system further comprises a boiler feed water pump for pumping the boiler feed water treated by the deaerator into the waste heat boiler.
According to the circulating cooling device of the water-cooling grate and the waste incineration power generation device, the flow rates of circulating cooling water of the water-cooling grate in two branches of condensation heating and air heating can be adjusted according to the change of the heat value of waste, when the heat value of the waste is low, the heat absorbed by the circulating cooling water is mainly used for heating air (for example times of air), and when the heat value of the waste is high, the heat absorbed by the circulating cooling water is mainly used for heating condensed water.
Drawings
The following drawings of the present invention are included to provide an understanding of the invention as part of and are included to provide a further understanding of the invention.
In the drawings:
fig. 1 shows a schematic structural diagram of a waste incineration power plant with a circulating cooling device of a water-cooled grate according to an embodiment of the invention.
Description of reference numerals:
the system comprises a water-cooled grate 1, a waste heat boiler 2, a steam turbine 3, a condenser 4, a condensate water pump 5, a grate water heat exchanger 6, a low-pressure heater 7, a deaerator 8, a boiler feed water pump 9, an air preheater 10, a circulating cooling water pump 11, a distribution unit 12 and a garbage incineration power generation device 100.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention, however, it will be apparent to one skilled in the art that embodiments of the present invention may be practiced without or more of these details.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
Fig. 1 shows a schematic structural diagram of a waste incineration power plant with a circulating cooling device of a water-cooled grate according to an embodiment of the invention. The circulating cooling device of the water-cooled grate and the waste incineration power generation device according to the embodiment of the invention are described in detail with reference to fig. 1.
As shown in fig. 1, the waste incineration power generation device 100 includes a waste incinerator, a water-cooled grate 1, a waste heat boiler 2, a steam turbine 3, a condenser 4, a condensate water pump 5, a grate water heat exchanger 6, a low-pressure heater 7, a deaerator 8, a boiler feed water pump 9, an air preheater 10, a circulating cooling water pump 11, and a distribution unit 12.
Wherein the waste incinerator (not shown) is used for waste incineration, and generates high-temperature flue gas carrying heat, and the high-temperature flue gas enters the waste heat boiler 2 through a flue or a pipeline between the waste incinerator and the waste heat boiler 2. In the present embodiment, for example, in order to be suitable for high calorific value waste incineration, a water-cooled grate 1 is used in the waste incinerator, waste is incinerated on the water-cooled grate 1, and the water-cooled grate is cooled by circulating cooling water to maintain the temperature below 100 ℃.
The waste heat boiler 2 is used for heating boiler feed water by using high-temperature flue gas generated in the waste incinerator to form steam. Boiler feed water is pumped into the waste heat boiler 2 by a boiler feed water pump 9, and is converted into steam after exchanging heat with high-temperature flue gas from the garbage incinerator in the waste heat boiler, and then the steam is conveyed into the steam turbine 3 through a pipeline.
The steam turbine 3 is used for utilizing the steam generated by the waste heat boiler 2 to do work so as to drive the generator to generate electricity, and the steam enters the condenser 4 through a pipeline after completing the work in the steam turbine 3.
The condenser 4 is used for condensing the steam that performs work in the steam turbine 3, so that the steam is converted into condensed water.
A condensate pump 5 is disposed between the condenser 4 and the furnace water heat exchanger 6, and is used for pumping the condensate water generated in the condenser 4 to the furnace water heat exchanger 6.
The furnace drainage heat exchanger 6 heats the condensed water from the condenser 4 by using the circulating cooling water introduced by the water-cooling grate 1 to increase the temperature of the condensed water. After heat exchange in the grate water heat exchanger 6, the condensed water enters the low-pressure heater 7 through a communicating pipeline.
The low-pressure heater 7 is used for heating the condensed water introduced by the grate water heat exchanger 6 to form boiler feed water. Illustratively, the low pressure heater 7 heats the condensate introduced by the grate water heat exchanger 6 with a portion of the steam that performs work in the steam turbine 3 to raise the temperature of the condensate to form boiler feed water. The boiler feed water is conducted into the deaerator 8 through a communication pipeline for deaerating.
The deaerator 8 is used to remove gas, such as oxygen or other gas, contained in the boiler feed water introduced by the low-pressure heater 7 to improve the quality of the boiler feed water, so as to facilitate the formation of steam in the waste heat boiler 2 in conformity with design parameters.
The boiler feed water pump 9 is used for pumping the boiler feed water processed by the deaerator 8 into the waste heat boiler 2, and the heat of the high-temperature flue gas generated by the garbage incinerator is converted into steam in the waste heat boiler 2, so that the steam is recycled.
The air preheater 10 is used to heat the air supplied to the waste incinerator using the circulating cooling water introduced from the water-cooled grate 1 to raise the temperature of the air, illustratively, in this embodiment, the air preheater 10 is used to heat times of the air supplied to the waste incinerator.
As mentioned above, in this embodiment, the waste incinerator uses a water cooled grate, which requires circulating cooling water for cooling.
In the embodiment, circulating cooling water is pumped into the water-cooling grate 1 through a circulating cooling water pump 11 to cool the water-cooling grate 1, and the temperature of the circulating cooling water rises after passing through the water-cooling grate 1. The heat absorbed by the circulating cooling water from the water-cooled grate 1 is used to heat the condensate formed by the condenser 4 and the air supplied to the waste incinerator. Specifically, after the circulating cooling water comes out of the water-cooled grate 1, part of the circulating cooling water enters the air preheater 10 through the distribution of the distribution unit 12, and exchanges heat with the air supplied to the garbage incinerator to increase the temperature of the air, and meanwhile, the temperature of the circulating cooling water is reduced and returns to the grate cooling water pump; part of the condensed water enters a fire grate water heat exchanger 6, and exchanges heat with the condensed water from the condenser 4 in the fire grate water heat exchanger 6, so that the temperature of the condensed water is increased, and meanwhile, the temperature of the condensed water is reduced and the condensed water returns to the fire grate cooling water pump.
In the process, the distribution unit 12 controls the amount of circulating cooling water introduced into the air preheater 10 and the grate water heat exchanger 6 by the water-cooled grate 1, specifically, when the system normally operates, half enters the air preheater 10 for heat exchange and half enters the grate water heat exchanger 6 for heat exchange, when the heat value of garbage is increased, the heat required for preheating times of wind is reduced, at the moment, the distribution unit 12 is adjusted to increase the flow rate entering the grate water heat exchanger 6 and simultaneously reduce the flow rate entering the air preheater 10, the heat utilization rate of the circulating cooling water system of the water-cooled grate 1 is improved, and when the heat value of garbage is reduced, the heat required for preheating times of wind is increased, namely, the distribution unit 12 is adjusted to reduce the flow rate entering the grate water heat exchanger 6 and simultaneously increase the flow rate entering the air preheater 4, the preheating temperature of times of wind is increased, and the power consumption of the system is reduced.
Illustratively, the dispensing unit 12 employs a three-way regulating valve.
The process flow of the waste incineration power generation device according to the embodiment is that circulating cooling water of the water-cooled grate 1 is sent into the water-cooled grate 1 through a circulating cooling water pump 11, the circulating cooling water is changed into high-temperature water after passing through the water-cooled grate 1, the high-temperature water is distributed through a distribution unit 12, paths are subjected to heat exchange through an air preheater 10, times of air heating and temperature rising are converted into low-temperature water, the low-temperature water is returned into the circulating cooling water pump 11, paths are subjected to heat exchange through a grate water heat exchanger 6, condensed water from a condensed water pump 5 is heated, the heated condensed water enters a deaerator 8 for deaerating after being heated through a low-pressure heater 7, then enters a boiler water feed pump 9, the boiler water feed pump 9 is sent into a waste heat boiler 2 for heat exchange, the steam enters a steam turbine 3 for work, the steam turbine 3 is discharged from the steam turbine after the work is completed, the condensed water is changed into the condensed water through a condenser 4, and the.
According to the waste incineration power generation device of the embodiment, the flow of circulating cooling water of the water-cooling grate in two branches of condensation heating and air heating can be adjusted according to the change of the heat value of waste, when the heat value of the waste is low, the heat absorbed by the circulating cooling water is mainly used for heating air (for example times of air), when the heat value of the waste is high, the heat absorbed by the circulating cooling water is mainly used for heating condensed water, the circulating cooling mode of the water-cooling grate can be flexibly switched, the distribution of the heat absorbed by the circulating water is adjusted according to requirements, and the consumption of the electric quantity of a system can be reduced as much as possible on the premise that the heat is completely utilized.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, the terms used herein are for the purpose of describing particular implementations only and are not intended to limit the invention.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1, A circulating cooling device of water-cooling fire grate, which is characterized in that it includes:
the grate cooling water pump is used for pumping circulating cooling water into the water-cooling grate to cool the water-cooling grate, and the temperature of the circulating cooling water is increased after the circulating cooling water passes through the water-cooling grate;
the air preheater is used for heating air by using circulating cooling water introduced by the water-cooling grate, and the temperature of the circulating cooling water is reduced and the circulating cooling water returns to the grate cooling water pump after heat exchange with the air in the air preheater is completed;
the boiler water draining heat exchanger is used for heating condensed water by using circulating cooling water led in by the water-cooling grate, the temperature of the circulating cooling water is reduced after the heat exchange with the condensed water in the boiler water draining heat exchanger is finished, the circulating cooling water returns to the boiler cooling water pump, the condensed water comes from a condenser communicated with the boiler water draining heat exchanger, and the condenser is used for condensing steam which finishes acting in a steam turbine so as to convert the steam into the condensed water;
and the distribution unit is used for controlling the amount of circulating cooling water guided into the air preheater and the furnace drainage heat exchanger by the water-cooled grate.
2. The hydronic grate of claim 1, wherein the distribution unit includes a three-way regulating valve.
3, kind waste incineration power generation facility, its characterized in that includes:
the garbage incinerator is internally provided with a water-cooled grate for incinerating garbage;
the waste heat boiler is used for heating boiler feed water by utilizing the smoke generated in the waste incinerator to form steam;
the steam turbine is used for utilizing the steam generated by the waste heat boiler to do work to drive the generator to generate electricity;
a condenser for condensing steam that performs work in the steam turbine to convert the steam into condensed water;
the grate cooling water pump is used for pumping circulating cooling water into the water-cooling grate to cool the water-cooling grate, and the temperature of the circulating cooling water is increased after the circulating cooling water passes through the water-cooling grate;
the air preheater is used for heating the air supplied to the garbage incinerator by using circulating cooling water introduced by the water-cooled grate so as to improve the temperature of the air, and the temperature of the circulating cooling water is reduced and returned to the grate cooling water pump after the heat exchange with the air in the air preheater is completed;
the furnace drainage heat exchanger is used for heating condensate water from the condenser by using circulating cooling water led in by the water-cooling grate so as to improve the temperature of the condensate water, the temperature of the circulating cooling water is reduced and the circulating cooling water returns to the grate cooling water pump after the heat exchange between the circulating cooling water and the condensate water in the furnace drainage heat exchanger is finished, and the condensate water is heated by the circulating cooling water and then is supplied to the waste heat boiler as boiler feed water for cyclic utilization;
and the distribution unit is used for controlling the amount of circulating cooling water guided into the air preheater and the furnace drainage heat exchanger by the water-cooled grate.
4. The waste incineration power plant of claim 3, wherein the distribution unit includes a three-way regulating valve.
5. The waste incineration power generation device according to claim 3 or 4, further comprising:
and the condensed water pump is arranged between the condenser and the furnace water-discharging heat exchanger and is used for pumping the condensed water generated in the condenser to the furnace water-discharging heat exchanger.
6. The waste incineration power generation device according to claim 3 or 4, further comprising:
and the low-pressure heater is used for heating the condensed water introduced by the grate water heat exchanger so as to form boiler feed water.
7. The waste incineration power generation device according to claim 6, further comprising:
and the deaerator is used for removing gas contained in the boiler feed water guided by the low-pressure heater.
8. The waste incineration power generation device according to claim 7, further comprising:
and the boiler water pump is used for pumping the boiler feed water treated by the deaerator into the waste heat boiler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810522837.0A CN108731004B (en) | 2018-05-28 | 2018-05-28 | Circulating cooling device of water-cooled grate and waste incineration power generation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810522837.0A CN108731004B (en) | 2018-05-28 | 2018-05-28 | Circulating cooling device of water-cooled grate and waste incineration power generation device |
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| CN108731004A CN108731004A (en) | 2018-11-02 |
| CN108731004B true CN108731004B (en) | 2020-01-31 |
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| CN113464943B (en) * | 2021-06-01 | 2023-11-14 | 光大环保技术研究院（深圳）有限公司 | High-parameter thermodynamic system suitable for garbage incineration and operation method thereof |
| CN113587116B (en) * | 2021-09-28 | 2021-12-21 | 光大环保技术装备（常州）有限公司 | Control method, control system and equipment for protection equipment in water-cooling circulation system |
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| CN201273571Y (en) * | 2008-08-07 | 2009-07-15 | 杨国伟 | Rear axle cooling type grate |
| RU2536318C1 (en) * | 2013-04-30 | 2014-12-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" | Rotary kiln for production of cement clinker |
| CN103388817A (en) * | 2013-07-16 | 2013-11-13 | 广西华锐钢铁工程设计咨询有限责任公司 | Residual heat recovery system of sewage water of coke dry quenching boiler |
| CN203571721U (en) * | 2013-11-07 | 2014-04-30 | 宋振林 | Combustion heating system taking biomass as fuel |
| CN206646073U (en) * | 2017-03-16 | 2017-11-17 | 广东正鹏生物质能源科技有限公司 | A kind of gas-carbon cogeneration biomass gasification combustion system |
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