CN217149017U - System for coal-fired unit preparation desulfurization building gypsum - Google Patents
System for coal-fired unit preparation desulfurization building gypsum Download PDFInfo
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- CN217149017U CN217149017U CN202221208272.7U CN202221208272U CN217149017U CN 217149017 U CN217149017 U CN 217149017U CN 202221208272 U CN202221208272 U CN 202221208272U CN 217149017 U CN217149017 U CN 217149017U
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Abstract
The utility model discloses a system for coal-fired unit preparation desulfurization building gypsum, including absorption tower, cyclone, belt hydroextractor, desulfurization gypsum storage tank, desicator, calciner, first hot air heater, second hot air heater, boiler, high pressure jar, intermediate pressure jar, low pressure jar, generator, condenser, low pressure heater group, oxygen-eliminating device, feed pump and high pressure heater group. The utility model discloses based on coal fired power generation system thermodynamic cycle has constructed the process flow who utilizes desulfurization gypsum preparation building gypsum, adopts the feedwater to add the hot-blast in grades to satisfy the heat source demand of desulfurization building gypsum preparation technology. The comprehensive utilization of the desulfurized gypsum of the coal-fired power plant is realized, the product types of the power plant are enriched, and the income of the power plant is increased.
Description
Technical Field
The utility model relates to a desulfurization gypsum technical field, concretely relates to system for coal-fired unit preparation desulfurization building gypsum.
Background
At present, the wet flue gas desulfurization process is one of the most common and most advanced desulfurization techniques. The specific process flow is as follows: introducing the dedusted flue gas into an absorption device, spraying slurry made of fine limestone or lime powder in the absorber to clean the flue gas, reacting sulfur dioxide gas in the flue gas with the limestone and the lime to generate calcium sulfite, and oxidizing the calcium sulfite into calcium sulfate dihydrate by large-area air. The treatment and comprehensive utilization of the desulfurized gypsum are one of the key factors influencing the popularization of the wet desulfurization technology in China.
The reserves of the natural gypsum in China are not very large, the grade is not high, and in addition, the natural gypsum is damaged difficultly to be retrieved when being exploited. Therefore, the comprehensive utilization of the desulfurized gypsum can bring economic benefits to enterprises and create good environmental benefits for society.
The desulfurized gypsum is treated by drying, calcining, crushing and other processes to obtain semi-hydrated gypsum which is often called desulfurized building gypsum as a cementing material of gypsum-based buildings. The technical indexes of the desulfurized building gypsum meet the requirements of national standards, wherein the flexural strength and the compressive strength of the desulfurized building gypsum are respectively higher than the strength requirements of the national standards building gypsum, and the desulfurized building gypsum is high-quality building gypsum and can be used as raw materials of various gypsum products.
SUMMERY OF THE UTILITY MODEL
In order to achieve the purpose, the utility model provides a system for coal-fired unit preparation desulfurization building gypsum, including coal-fired power generation system, desulfurization building gypsum preparation system. The process flow for preparing the building gypsum by utilizing the desulfurized gypsum is constructed based on the thermodynamic cycle of the coal-fired power generation system, so that the comprehensive utilization of the desulfurized gypsum of the coal-fired power plant is realized, the product types of the power plant are enriched, and the income of the power plant is increased.
The utility model discloses a following technical scheme realizes:
a system for preparing desulfurized building gypsum by a coal-fired unit comprises an absorption tower, a cyclone separator, a belt dehydrator, a desulfurized gypsum storage tank, a dryer, a calciner, a first hot air heater, a second hot air heater, a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, a low-pressure heater group, a deaerator, a water feed pump and a high-pressure heater group;
a gypsum suspension outlet of the absorption tower is connected to a gypsum suspension inlet of the cyclone separator, a backflow slurry outlet of the cyclone separator is connected to a backflow slurry inlet of the absorption tower, a gypsum slurry outlet of the cyclone separator is connected to an inlet of the belt dehydrator, an outlet of the belt dehydrator is connected to an inlet of the desulfurized gypsum storage tank, an outlet of the desulfurized gypsum storage tank is connected to a desulfurized gypsum inlet of the dryer, and a dried desulfurized gypsum outlet of the dryer is connected to a dried desulfurized gypsum inlet of the calciner;
the flue gas outlet of boiler is connected to the flue gas inlet of absorption tower, the main steam outlet of boiler is connected to the main steam inlet of high pressure cylinder, the cold reheat steam outlet of high pressure cylinder is connected to the cold reheat steam inlet of boiler, the hot reheat steam outlet of boiler is connected to the hot reheat steam inlet of intermediate pressure cylinder, the steam outlet of intermediate pressure cylinder is connected to the steam inlet of low pressure cylinder, the steam exhaust outlet of low pressure cylinder is connected to the import of condenser, the export of condenser and the water outlet of first hot air heater are connected to the import of low pressure heater group, the export of low pressure heater group loops through oxygen-eliminating device and feed pump and is connected to the import of high pressure heater group, the export of high pressure heater group is connected to the boiler feed water import of boiler and the hot water inlet of second hot air heater respectively, the hot water outlet of second hot air heater is connected to the hot water inlet of first hot air heater, the hot air outlet of first hot air heater is connected to the hot air inlet of dryer and the hot air inlet of second hot air heater respectively The hot air outlet of the second hot air heater is connected to the hot air inlet of the calcinator;
the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are sequentially and coaxially connected and are connected with the generator.
The utility model discloses a further improvement lies in, still is provided with absorbent thick liquid import on the absorption tower.
The utility model discloses further improvement lies in, still includes the chimney, and the exhanst gas outlet of absorption tower is connected to the import of chimney.
The utility model is further improved in that the calcinator is also provided with a desulfurized building gypsum outlet.
The utility model discloses further improvement lies in, and the exit of condenser still is provided with condensate pump.
The utility model discloses further improvement lies in, and first hot air heater's hot air outlet is connected to and is provided with first draught fan on the pipeline of desicator.
The utility model discloses a further improvement lies in, second hot air heater's hot air outlet department is provided with the second draught fan.
The utility model discloses further improvement lies in, is provided with air intlet on the first hot air heater.
The utility model discloses at least, following profitable technological effect has:
the utility model provides a system for coal-fired unit preparation desulfurization building gypsum. The process flow for preparing the building gypsum by utilizing the desulfurized gypsum is constructed on the basis of the thermodynamic cycle of the coal-fired power generation system, and the hot air is heated by water supply in a grading manner so as to meet the heat source requirement of the preparation process of the desulfurized building gypsum. The comprehensive utilization of the desulfurized gypsum of the coal-fired power plant is realized, the product types of the power plant are enriched, and the income of the power plant is increased.
Drawings
Fig. 1 is a block diagram of the present invention.
Description of reference numerals:
1-an absorption tower, 2-a cyclone separator, 3-a belt dehydrator, 4-a desulfurized gypsum storage tank, 5-a dryer, 6-a calcinator, 7-a first hot air heater, 8-a second hot air heater, 9-a first induced draft fan, 10-a second induced draft fan, 11-a boiler, 12-a high pressure cylinder, 13-a medium pressure cylinder, 14-a low pressure cylinder, 15-a generator, 16-a condenser, 17-a condensate pump, 18-a low pressure heater group, 19-a deaerator, 20-a water feeding pump, 21-a high pressure heater group and 22-a chimney.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, a coal-fired unit preparation desulfurization building gypsum's system, including absorption tower 1, cyclone 2, belt dewaterer 3, desulfurization gypsum storage tank 4, desicator 5, calciner 6, first hot air heater 7, second hot air heater 8, first draught fan 9, second draught fan 10, boiler 11, high-pressure cylinder 12, intermediate pressure cylinder 13, low-pressure cylinder 14, generator 15, condenser 16, condensate pump 17, low-pressure heater group 18, oxygen-eliminating device 19, feed pump 20, high-pressure heater group 21 and chimney 22.
A gypsum suspension outlet of the absorption tower 1 is connected to a gypsum suspension inlet of the cyclone separator 2, a backflow slurry outlet of the cyclone separator 2 is connected to a backflow slurry inlet of the absorption tower 1, a gypsum slurry outlet of the cyclone separator 2 is connected to an inlet of the belt dehydrator 3, an outlet of the belt dehydrator 3 is connected to an inlet of the desulfurized gypsum storage tank 4, an outlet of the desulfurized gypsum storage tank 4 is connected to a desulfurized gypsum inlet of the dryer 5, and a dried desulfurized gypsum outlet of the dryer 5 is connected to a dried desulfurized gypsum inlet of the calciner 6;
an absorbent slurry inlet is arranged on the absorption tower 1, a flue gas outlet of a boiler 11 is connected to a flue gas inlet of the absorption tower 1, a flue gas outlet of the absorption tower 1 is connected to an inlet of a chimney 22, a main steam outlet of the boiler 11 is connected to a main steam inlet of a high-pressure cylinder 12, a cold re-steam outlet of the high-pressure cylinder 12 is connected to a cold re-steam inlet of the boiler 11, a hot re-steam outlet of the boiler 11 is connected to a hot re-steam inlet of a medium-pressure cylinder 13, a steam outlet of the medium-pressure cylinder 13 is connected to a steam inlet of a low-pressure cylinder 14, a steam exhaust outlet of the low-pressure cylinder 14 is connected to an inlet of a condenser 16, an outlet of the condenser 16 and a water outlet of a first hot air heater 7 are connected to an inlet of a low-pressure heater group 18, a condensation water pump 17 is further arranged at an outlet of the condenser 16, an outlet of the low-pressure heater group 18 is connected to an inlet of the high-pressure heater group 21 through a deaerator 19 and a water feed pump 20 in sequence, outlets of the high-pressure heater group 21 are respectively connected to a boiler feed water inlet of the boiler 11 and a hot water inlet of the second hot air heater 8, a hot water outlet of the second hot air heater 8 is connected to a hot water inlet of the first hot air heater 7, a hot air outlet of the first hot air heater 7 is respectively connected to a hot air inlet of the dryer 5 and a hot air inlet of the second hot air heater 8, and a hot air outlet of the second hot air heater 8 is connected to a hot air inlet of the calciner 6; a first induced draft fan 9 is arranged on a pipeline of the first hot air heater 7, wherein a hot air outlet of the first hot air heater is connected to the dryer 5. A second induced draft fan 10 is arranged at a hot air outlet of the second hot air heater 8.
The high pressure cylinder 12, the intermediate pressure cylinder 13, and the low pressure cylinder 14 are coaxially connected in this order, and are connected to a generator 15.
The boiler flue gas enters an absorption tower and reacts with the sprayed absorbent slurry to generate calcium sulfate dihydrate, so that sulfur dioxide in the flue gas is removed. The absorbent slurry is prepared by mixing limestone or lime which is crushed and ground with water.
CaO+H 2 O→Ca(OH) 2
SO 2 +H 2 O→H 2 SO 3
H 2 SO 3 +1/2H 2 O→H 2 SO 4
H 2 SO 4 +CaCO 3 +H 2 O→CaSO 4 ·2H 2 O+CO 2
The generated gypsum suspension is separated by a cyclone separator, enters a belt dehydrator with high density for further dehydration to form desulfurized gypsum, and enters a desulfurized gypsum storage tank. The remainder of the slurry is returned to the absorber.
The desulfurization gypsum in the desulfurization gypsum storage tank enters a dryer, is dried and dehydrated by hot air and then enters a calcinator, and calcium sulfate hemihydrate is formed after high-temperature calcination and dehydration, namely, desulfurization building gypsum is generated:
the hot air in the dryer comes from the first hot air heater and has the temperature of about 50 ℃. And after drying and filtering, part of the air enters a first hot air heater to exchange heat with water at an outlet of a second hot air heater, and after being heated and warmed, the air enters a dryer through a first induced draft fan to heat the desulfurized gypsum, wherein the drying and heating temperature is 50 ℃, and the heat preservation time is about 1 h.
The heat source hot air in the calcinator comes from a second hot air heater and has the temperature of about 160 ℃. And one part of the hot air primarily heated in the first hot air heater enters the dryer, the other part of the hot air enters the second hot air heater, exchanges heat with high-temperature water supplied from the outlet of the high-pressure heater group, is heated and heated, and then enters the calcinator through the second induced draft fan, so that the desulfurized gypsum is further calcinated and dehydrated to generate the desulfurized building gypsum. The temperature of the calcination treatment is about 160 ℃, and the heat preservation time is 2 h.
High-temperature feed water at the outlet of the high-pressure heater group firstly enters the second hot air heater, and then enters the first hot air heater after heat exchange, so that the cascade heat exchange utilization of high-temperature feed water heat can be realized, the end difference of the heat exchanger is reduced, and the system efficiency is improved.
After the dry air enters the first hot air heater to be heated, part of the dry air enters the dryer, and part of the dry air continues to enter the second hot air heater, so that the heat exchange end difference of the second hot air heater is reduced, and the heat exchange efficiency is favorably improved.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A system for preparing desulfurized building gypsum by a coal-fired unit is characterized by comprising an absorption tower, a cyclone separator, a belt dehydrator, a desulfurized gypsum storage tank, a dryer, a calciner, a first hot air heater, a second hot air heater, a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a condenser, a low-pressure heater group, a deaerator, a water feed pump and a high-pressure heater group;
a gypsum suspension outlet of the absorption tower is connected to a gypsum suspension inlet of the cyclone separator, a backflow slurry outlet of the cyclone separator is connected to a backflow slurry inlet of the absorption tower, a gypsum slurry outlet of the cyclone separator is connected to an inlet of the belt dehydrator, an outlet of the belt dehydrator is connected to an inlet of the desulfurized gypsum storage tank, an outlet of the desulfurized gypsum storage tank is connected to a desulfurized gypsum inlet of the dryer, and a dried desulfurized gypsum outlet of the dryer is connected to a dried desulfurized gypsum inlet of the calciner;
the flue gas outlet of boiler is connected to the flue gas inlet of absorption tower, the main steam outlet of boiler is connected to the main steam inlet of high pressure cylinder, the cold reheat steam outlet of high pressure cylinder is connected to the cold reheat steam inlet of boiler, the hot reheat steam outlet of boiler is connected to the hot reheat steam inlet of intermediate pressure cylinder, the steam outlet of intermediate pressure cylinder is connected to the steam inlet of low pressure cylinder, the steam exhaust outlet of low pressure cylinder is connected to the import of condenser, the export of condenser and the water outlet of first hot air heater are connected to the import of low pressure heater group, the export of low pressure heater group loops through oxygen-eliminating device and feed pump and is connected to the import of high pressure heater group, the export of high pressure heater group is connected to the boiler feed water import of boiler and the hot water inlet of second hot air heater respectively, the hot water outlet of second hot air heater is connected to the hot water inlet of first hot air heater, the hot air outlet of first hot air heater is connected to the hot air inlet of dryer and the hot air inlet of second hot air heater respectively The hot air outlet of the second hot air heater is connected to the hot air inlet of the calcinator;
the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are sequentially and coaxially connected and are connected with the generator.
2. The system for preparing the desulfurized building gypsum by using the coal-fired unit according to claim 1, wherein the absorption tower is further provided with an absorbent slurry inlet.
3. The system for preparing desulfurized building gypsum by using coal-fired unit according to claim 1, further comprising a chimney, wherein the flue gas outlet of the absorption tower is connected to the inlet of the chimney.
4. The system for preparing the desulfurized building gypsum by using the coal-fired unit according to claim 1, wherein the calciner is further provided with a desulfurized building gypsum outlet.
5. The system for preparing the desulfurized building gypsum by using the coal-fired unit according to claim 1, wherein a condensate pump is further arranged at an outlet of the condenser.
6. The system for preparing desulfurized building gypsum by using coal-fired unit according to claim 1, wherein the hot air outlet of the first hot air heater is connected to the pipeline of the dryer, and a first induced draft fan is arranged on the pipeline.
7. The system for preparing desulfurized building gypsum by using coal-fired unit according to claim 1, wherein a second induced draft fan is arranged at a hot air outlet of the second hot air heater.
8. The system for preparing desulfurized building gypsum according to claim 1, wherein the first hot air heater is provided with an air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221208272.7U CN217149017U (en) | 2022-05-19 | 2022-05-19 | System for coal-fired unit preparation desulfurization building gypsum |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221208272.7U CN217149017U (en) | 2022-05-19 | 2022-05-19 | System for coal-fired unit preparation desulfurization building gypsum |
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| CN217149017U true CN217149017U (en) | 2022-08-09 |
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| CN202221208272.7U Active CN217149017U (en) | 2022-05-19 | 2022-05-19 | System for coal-fired unit preparation desulfurization building gypsum |
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