CN111908543A - Direct waste heat source cement production and seawater desalination combined implementation system and method - Google Patents
Direct waste heat source cement production and seawater desalination combined implementation system and method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to the field of energy recovery and utilization, aims to solve the problems of fresh water shortage and low energy utilization rate in remote coastal areas, and provides a system and a method for realizing the combination of direct waste heat source cement production and seawater desalination. The method for realizing the combination of the direct waste heat source cement production and the seawater desalination comprises the following steps of directly using the flue gas of a cement system for seawater desalination after dedusting. The invention has the advantages of being very suitable for remote coastal areas, realizing the organic combination of cement production and seawater desalination, having high energy utilization rate and being capable of producing fresh water and cement simultaneously.
Description
Technical Field
The invention relates to the field of energy recovery and utilization, in particular to a system and a method for realizing the combination of direct waste heat source cement production and seawater desalination.
Background
Water covers approximately 70% of the earth's surface, but as an important condition for life survival and development, only 2.5% of this water is fresh water, and in this very small proportion of fresh water, the fraction that can be directly accessed is only 0.3%. The problem of water resource shortage is rolled up to the world.
The economy is relatively lagged behind in the middle east, the north africa and the western Asia coastal areas, and fresh water resources are more deficient while resources such as cement and the like are seriously lacked. The development of society is influenced by water resource shortage, the water resource is not limited to domestic water, and agricultural production and industrial production are also limited by water resource distribution and cost, and the problem is more prominent along with the development of economy. Like cement plants are usually built in relatively remote places, the places such as 'islands' are often lack of fresh water resources, and in addition, the water consumption is large, the introduction of fresh water requires huge capital for building a pipe network, the water price is high, the contradiction of water competition with fresh water introduction areas is caused, and the risk of supply interruption exists.
The coastal seawater desalination has the great advantage of seawater sufficiency, and is a measure which is long-standing and can develop a new fresh water source. The most basic principle is to separate the solvent (i.e., water) from the seawater from other components (especially salts). The seawater desalination process is mainly divided into a thermal method and a membrane method, wherein the thermal method is represented by multi-stage flash evaporation and low-temperature multi-effect distillation, and the membrane method is represented by a reverse osmosis method. It can be seen that seawater desalination is a vigorous development process, but energy consumption is still a core factor for inhibiting the development.
The cement production process needs to consume a large amount of energy and a large amount of energy waste exists in a cement production system, so that the cement production becomes a well-known energy consumer, a large amount of electric energy needs to be consumed, in order to reduce energy consumption and solve electric energy supply, a conventional cement kiln is built with a waste heat power generation project, but the waste heat power generation project usually adopts low parameters, the overall efficiency of waste heat power generation is only about 20%, and the waste heat recovery utilization rate is very low, so the problems of energy waste and very low waste heat recovery utilization rate exist in the cement industry.
Disclosure of Invention
The invention aims to provide a system and a method for realizing the combination of direct waste heat source cement production and seawater desalination, so as to solve the problems of fresh water shortage and low energy utilization rate in remote coastal areas.
The embodiment of the invention is realized by the following steps:
a method for realizing the combination of direct waste heat source cement production and seawater desalination is characterized in that kiln head smoke, kiln tail smoke and bypass air discharge gas exhausted by a cement system are respectively subjected to dust removal treatment to generate clean smoke, each path of clean smoke is respectively sent into a seawater desalination system through a kiln head air feeder, a kiln tail air feeder and a bypass air discharge air feeder, the temperature is reduced after heat exchange is carried out in the seawater desalination system, and the clean smoke is discharged into the atmosphere through a chimney;
the seawater desalination system comprises a fresh water collecting and conveying system, a strong brine conveying system, a condenser and a multi-stage evaporator; clean flue gas is sent into a first evaporator of a seawater desalination system;
the pretreated seawater passes through a condenser and then enters a first stage of an evaporator to exchange heat with clean flue gas from a cement system; part of seawater is vaporized in the evaporator due to heat absorption, the concentrated seawater sequentially enters each evaporator connected in series behind the first-stage evaporator for repeated evaporation, steam evaporated by the former-stage evaporator is used as a heat source of the next-stage evaporator, the heat-releasing part of the seawater in the next-stage evaporator is condensed into fresh water, the fresh water enters the fresh water collecting and conveying system, and concentrated brine concentrated in the last-stage evaporator enters the concentrated brine conveying system.
The direct waste heat source cement production and seawater desalination combined implementation method in the scheme has the following beneficial effects:
1. aiming at the coastal cement plants built in relatively remote places, the island places are often lack of fresh water resources, and in addition, the water consumption is large, the introduction of fresh water requires huge capital for building a pipe network, the water price is high, the contradiction of water competition with fresh water introduction areas is caused, and the risk of supply interruption exists. The coastal seawater desalination system has the advantages that seawater is sufficient and huge, various waste heat resources of a cement plant and the requirement of seawater desalination on energy have complementarity, and fresh water is generated through system coupling, so that the problem of water for life and production of cement enterprises is solved, the surplus fresh water can be sold, and the economic benefit of the enterprises is increased.
2. The cement production process needs to consume a large amount of energy and the cement production system has energy waste, if the generated waste gas is directly discharged, the energy waste is large, the overall efficiency of the waste heat power generation in the prior art is only about 20 percent, and the applicant researches and discovers that the waste steam discharged by the steam turbine contains a large amount of latent heat and cannot be utilized, so that the waste heat recovery utilization rate is low. In the embodiment, the seawater desalination is realized by systematically coupling, so that the energy utilization rate is greatly improved, the problem of low waste heat recovery utilization rate is solved, the problem of seawater desalination energy consumption is also solved, and a seawater desalination heat source device does not need to be established independently.
In conclusion, the direct waste heat source cement production and seawater desalination combined implementation method provided by the scheme organically combines cement production and seawater desalination, has high energy utilization rate, can simultaneously produce fresh water and cement, is particularly suitable for remote sea areas with water shortage, reduces the comprehensive cost of seawater desalination and cement production, and has important economic benefits and environmental protection benefits.
In one embodiment:
and the concentrated strong brine in the last stage of evaporator enters a strong brine conveying system and is used for preparing salt or extracting bromine.
The scheme also provides a method for realizing the combination of direct waste heat source cement production and seawater desalination, wherein clean flue gas is generated after dust removal treatment of flue gas discharged by a grate cooler of a cement system, the clean flue gas is sent into a seawater desalination system through a kiln head blower, the temperature is reduced after heat exchange is carried out in the seawater desalination system, and the flue gas is discharged into the atmosphere through a chimney;
the seawater desalination system comprises a brine heater, a heat recovery section, a heat discharge section, a fresh water collecting and conveying system and a strong brine conveying system, wherein the heat recovery section is provided with multistage evaporation chambers connected in series; clean flue gas is sent into a brine heater of a seawater desalination system;
the pretreated seawater is firstly sent into a heat discharging section to be used as cooling water, most of the cooling seawater leaving the heat discharging section is discharged back to the sea, and the small part of the cooling seawater is used as feeding seawater, enters the heat discharging section after being subjected to oxygen removal pretreatment, then the circulating brine is sent into a heat recovering section from the heat discharging section through a water pump to recover the heat of flash evaporation fresh water steam, and then is heated by the high-grade steam through a brine heater, wherein the brine reaches the highest temperature required by the process; the heated circulating saline water enters an evaporation chamber of a first stage of a heat recovery section, the pressure in the evaporation chamber is controlled to be lower than the saturated vapor pressure corresponding to the temperature of the hot saline water, so that the hot saline water is changed into superheated water and is rapidly and partially vaporized after entering the evaporation chamber, the temperature of the hot saline water is reduced, the generated vapor is condensed into required fresh water, and the required fresh water enters a fresh water collecting and conveying system; meanwhile, the brine is gradually thickened until the temperature of the brine is close to the temperature of the natural seawater downwards; and discharging the strong brine from the heat discharging section, and feeding the strong brine into a strong brine conveying system for preparing salt or extracting bromine.
The scheme also provides a direct waste heat source cement production and seawater desalination combined realization system, which comprises a cement system and a seawater desalination system;
the cement system comprises a grate cooler, a rotary kiln and a preheater; wherein the grate cooler is connected with the rotary kiln and is communicated with the decomposing furnace of the preheater through a smoke chamber;
the seawater desalination system comprises a fresh water collecting and conveying system, a strong brine conveying system, a condenser and a multi-stage evaporator; the seawater water supply inlet passes through a cooling pipe of the condenser and then respectively enters each stage of evaporator; the evaporator of each stage is respectively provided with a strong brine outlet at the lower part and a vapor outlet at the upper part;
the grate cooler is provided with an air suction port which is communicated to a dust remover, the dust remover is communicated to a kiln head air feeder, the kiln head air feeder is communicated to an inlet of a heat exchange tube of a first-stage evaporator of the seawater desalination system, and an outlet of the heat exchange tube of the first-stage evaporator is communicated to the atmosphere through a chimney;
in the seawater desalination system, a strong brine outlet of a previous stage evaporator is connected into a next stage evaporator, a vapor outlet of the previous stage evaporator is communicated with a heat exchange tube of the next stage evaporator to be used as a heat source of the next stage evaporator, and the strong brine outlet is communicated to a fresh water collecting and conveying system through an outlet end of the heat exchange tube of the next stage evaporator after releasing heat; the strong brine outlet of the last stage evaporator is communicated to a strong brine conveying system, and the steam outlet of the last evaporator is communicated into the condenser to release heat to seawater in the condenser and then liquefy the seawater to flow into a fresh water collecting and conveying system.
The scheme also provides a system for realizing the combination of direct waste heat source cement production and seawater desalination, which comprises a cement system and a seawater desalination system;
the cement system comprises a grate cooler;
the seawater desalination system comprises a brine heater, a heat recovery section, a heat discharge section, a fresh water collecting and conveying system and a strong brine conveying system, wherein the heat recovery section is provided with multistage evaporation chambers connected in series;
the grate cooler is provided with an air suction port which is communicated to a dust remover, the dust remover is communicated to a kiln head air feeder, the kiln head air feeder is communicated to an inlet of a heat exchange tube of the brine heater, and an outlet of the heat exchange tube of the brine heater is communicated to the atmosphere through a chimney;
the seawater supply port is communicated with a cooling pipe in the heat extraction section, one path of an outlet of the cooling pipe in the heat extraction section is communicated with the outside to discharge seawater, the other path of the outlet is communicated with the inside of the heat extraction section, and a water outlet of the heat extraction section is communicated with the cooling pipe connected in series with each stage of evaporation chambers of the heat recovery section and then is introduced into a brine heater; the outlet of the brine heater is sequentially communicated into the evaporation chambers of all stages, and the outlet of the evaporation chamber of the last stage is communicated to the heat discharge section and then communicated to the brine conveying system through the heat discharge section; and fresh water of the heat discharging section and the evaporation chambers at all stages after the water vapor is cooled by the cooling pipes in the heat discharging section and the evaporation chambers at all stages is respectively communicated with a fresh water collecting and conveying system.
In one embodiment:
the heat removal section includes a plurality of stages of evaporation chambers connected in series.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without paying inventive effort.
Fig. 1 is a schematic diagram of a direct waste heat source cement production and seawater desalination combined implementation system in a first embodiment of the invention (wherein arrows on lines indicate the flow direction of gas or seawater or fresh water);
fig. 2 is a schematic diagram of a direct waste heat source cement production and seawater desalination combined implementation system in the second embodiment of the present invention (wherein arrows on the lines indicate the flow direction of gas or seawater or fresh water);
icon:
in fig. 1: the system comprises a cement system 10, a seawater desalination system 20, a grate cooler 11, a rotary kiln 12, a preheater 13, a smoke chamber 14, a decomposing furnace 15, an air extracting port 17, a dust remover 18, a seawater supply port 21, a concentrated salt water outlet 22, a steam outlet 23, a seawater adding port 24, a cooling pipe 27, a heat exchange pipe 28, a kiln head blower 1a, a kiln tail blower 2a, a bypass air discharge blower 3a, a chimney 4a, an evaporator 6a, a condenser 7a, a fresh water collecting and conveying system 8a and a concentrated brine conveying system 9 a;
in fig. 2: the system comprises a cement system 10, a seawater desalination system 20, a grate cooler 11, an air extraction opening 17, a dust remover 18, a seawater water supply opening 21, a cooling pipe 27, a heat exchange pipe 28, a water outlet 29 of a heat exhaust section, a kiln head blower 1b, a chimney 4b, a brine heater 6b, a heat recovery section 7b, a heat exhaust section 8b, a fresh water collecting and conveying system 9b, a concentrated brine conveying system 10b and an evaporation chamber 11 b.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
Referring to fig. 1, the present embodiment provides a system for realizing the combination of direct waste heat source cement production and seawater desalination, which includes a cement system 10 and a seawater desalination system 20.
The cement system 10 comprises a grate cooler 11, a rotary kiln 12 and a preheater 13; wherein, the grate cooler 11 is connected with the rotary kiln 12, the rotary kiln 12 is communicated with a decomposing furnace 15 of the preheater 13 through a smoke chamber 14.
The seawater desalination system 20 comprises a fresh water collecting and conveying system 8a, a concentrated brine conveying system 9a, a condenser 7a and a multi-stage evaporator 6a (only the first two stages and the last stage are shown in the figure, and the other stages in the middle are not shown, and each stage of evaporator 6a is a first stage … and a second stage … from right to left in sequence); the seawater supply port 21 passes through a cooling pipe 27 of the condenser 7a and then enters each stage of evaporator 6 a; in each stage of the evaporator 6a, a concentrated brine outlet 22 is provided at the lower part and a steam outlet 23 is provided at the upper part.
The grate cooler 11 is provided with an air suction port 17, the air suction port 17 is communicated to a dust remover 18, the dust remover 18 is communicated to a kiln head air feeder 1a, the kiln head air feeder 1a is communicated to the inlet of a heat exchange tube 28 of a first-stage evaporator 6a of the seawater desalination system 20, and the outlet of the heat exchange tube 28 of the first-stage evaporator 6a is communicated to the atmosphere through a chimney 4 a.
In the seawater desalination system 20, a strong brine outlet 22 of a previous-stage evaporator 6a is communicated into a next-stage evaporator 6a, a vapor outlet 23 of the previous-stage evaporator 6a is communicated with a heat exchange tube 28 of the next-stage evaporator 6a, and is used as a heat source of the next-stage evaporator 6a, and after heat release, the outlet end of the heat exchange tube 28 of the next-stage evaporator 6a is communicated to a fresh water collecting and conveying system 8 a; a strong brine outlet 22 of the last stage evaporator 6a is communicated to a strong brine conveying system 9a, and a steam outlet 23 of the last evaporator 6a is communicated to the condenser 7a to release heat to seawater in the condenser 7a, and then the seawater is liquefied and flows into a fresh water collecting and conveying system 8 a.
The direct waste heat source cement production and seawater desalination combined implementation method based on the direct waste heat source cement production and seawater desalination combined implementation system in the embodiment is that kiln head flue gas, kiln tail flue gas and bypass air discharge gas exhausted from the cement system 10 are respectively subjected to dust removal treatment to generate clean flue gas, each path of clean flue gas is respectively sent into the seawater desalination system 20 through a kiln head air feeder 1a, a kiln tail air feeder 2a and a bypass air discharge air feeder 3a, the temperature is reduced after heat exchange is carried out in the seawater desalination system 20, and the clean flue gas is discharged into the atmosphere through a chimney 4 a;
the seawater desalination system 20 comprises a fresh water collecting and conveying system 8a, a strong brine conveying system 9a, a steam condenser 7a and a multi-stage evaporator 6 a; the clean flue gas is sent into a first evaporator 6a of a seawater desalination system;
the pretreated seawater passes through a condenser 7a, enters a first stage of an evaporator 6a, and exchanges heat with clean flue gas from a cement system 10; part of seawater is vaporized in the evaporator 6a due to heat absorption, the concentrated seawater sequentially enters each evaporator 6a connected in series behind the first-stage evaporator 6a for repeated evaporation, steam evaporated from the previous-stage evaporator 6a is used as a heat source of the next-stage evaporator 6a, and is partially condensed into fresh water in the next-stage evaporator 6a through heat release, the fresh water enters the fresh water collecting and conveying system 8a, and the concentrated brine concentrated in the last-stage evaporator 6a enters the concentrated brine conveying system 9 a.
The direct waste heat source cement production and seawater desalination combined implementation method in the scheme has the following beneficial effects:
1. aiming at the coastal cement plants built in relatively remote places, the island places are often lack of fresh water resources, and in addition, the water consumption is large, the introduction of fresh water requires huge capital for building a pipe network, the water price is high, the contradiction of water competition with fresh water introduction areas is caused, and the risk of supply interruption exists. The coastal seawater desalination system has the advantages that seawater is sufficient and huge, various waste heat resources of a cement plant and the requirement of seawater desalination on energy have complementarity, and fresh water is generated through system coupling, so that the problem of water for life and production of cement enterprises is solved, the surplus fresh water can be sold, and the economic benefit of the enterprises is increased.
2. The cement production process needs to consume a large amount of energy and the cement production system has energy waste, if the generated waste gas is directly discharged, the energy waste is large, the overall efficiency of the waste heat power generation in the prior art is only about 20 percent, and the applicant researches and discovers that the waste steam discharged by the steam turbine contains a large amount of latent heat and cannot be utilized, so that the waste heat recovery utilization rate is low. In the embodiment, the seawater desalination is realized by systematically coupling, so that the energy utilization rate is greatly improved, the problem of low waste heat recovery utilization rate is solved, the problem of seawater desalination energy consumption is also solved, and a seawater desalination heat source device does not need to be established independently.
In conclusion, the direct waste heat source cement production and seawater desalination combined implementation method provided by the scheme organically combines cement production and seawater desalination, has high energy utilization rate, can simultaneously produce fresh water and cement, is particularly suitable for remote sea areas with water shortage, reduces the comprehensive cost of seawater desalination and cement production, and has important economic benefits and environmental protection benefits.
In this embodiment, the concentrated brine in the last stage evaporator 6a may be fed into the brine conveying system 9a for salt preparation or bromine extraction. In this way, the products produced by the system can be further fully utilized.
In this embodiment, the pretreated seawater additionally enters the direct waste heat source cement of each evaporator 6a after the direct waste heat source cement of the first evaporator 6a through the seawater addition port 24, so as to additionally supply seawater to the direct waste heat source cement of each subsequent evaporator 6 a. Therefore, energy waste caused by the fact that the rear-stage evaporator 6a directly uses the waste heat in the heat source cement without seawater can be avoided. The steam evaporated by the evaporator 6a of the last stage directly using the waste heat source cement enters the condenser 7a to directly use the waste heat source cement to release heat to the seawater directly using the waste heat source cement by the condenser 7a, and then is condensed into fresh water to enter the fresh water collecting and conveying system 8a to directly use the waste heat source cement.
The system and the method for realizing the combination of cement production and seawater desalination in the coastal region have the following beneficial effects:
1. aiming at the coastal cement plants built in relatively remote places, the island places are often lack of fresh water resources, and in addition, the water consumption is large, the introduction of fresh water requires huge capital for building a pipe network, the water price is high, the contradiction of water competition with fresh water introduction areas is caused, and the risk of supply interruption exists. The coastal seawater desalination system has the advantages that seawater is sufficient and huge, various waste heat resources of a cement plant and the requirement of seawater desalination on energy have complementarity, and fresh water production is realized through system coupling, so that the problem of water for life and production of cement enterprises is solved, the surplus fresh water can be sold, and the economic benefit of the enterprises is increased.
2. The cement production process needs to consume a large amount of energy and the cement production system has energy waste, if the generated waste gas is directly discharged, the energy waste is large, the overall efficiency of the waste heat power generation in the prior art is only about 20 percent, and the applicant researches and discovers that the waste steam discharged by the steam turbine contains a large amount of latent heat and cannot be utilized, so that the waste heat recovery utilization rate is low. In the embodiment, the fresh water production is realized through the system-ground coupling, so that the energy utilization rate is greatly improved, the problem of low waste heat recovery utilization rate is solved, the problem of energy consumption of seawater desalination is also solved, and a seawater desalination heat source device does not need to be established independently.
In conclusion, the method for realizing the combination of cement production and seawater desalination in the coastal areas organically combines the cement production and the seawater desalination, has high energy utilization rate, can simultaneously produce fresh water and cement, is particularly suitable for remote coastal areas with water shortage, reduces the comprehensive cost of the seawater desalination and the cement production, and has important economic benefit and environmental protection benefit.
In this embodiment, the concentrated brine in the last stage evaporator 6a may be fed into the brine conveying system 9a for salt preparation or bromine extraction. In this way, the products produced by the system can be further fully utilized.
In this embodiment, the pretreated seawater additionally enters the evaporators 6a of the respective stages after the first-stage evaporator 6a through the seawater addition port 2424, so as to additionally supply seawater to the evaporators 6a of the subsequent stages. Thus, energy waste caused by no seawater in the rear-stage evaporator 6a can be avoided. The vapor evaporated by the last stage of evaporator 6a enters the condenser 7a, releases heat to the seawater passing through the condenser 7a, and is condensed into fresh water to enter the fresh water collecting and conveying system 8 a.
In this embodiment, the boiler for recovering waste heat may be any one or any two or three of an AQC boiler, an SP boiler, and a BP boiler, and the boiler for recovering waste heat may be a single-pressure boiler or a double-pressure boiler.
Example two
Referring to fig. 2, the present embodiment also provides a system for realizing the combination of direct waste heat source cement production and seawater desalination, which includes a cement system 10 and a seawater desalination system 20. Wherein, the cement system 10 comprises a grate cooler 11.
The seawater desalination system 20 comprises a brine heater 6b, a heat recovery section 7b, a heat discharge section 8b, a fresh water collection and delivery system 9b and a concentrated brine delivery system 10b, wherein the heat recovery section 7b is provided with a plurality of stages of evaporation chambers 11b connected in series.
The grate cooler 11 is provided with an air suction port 17, the air suction port 17 is communicated to a dust remover 18, the dust remover 18 is communicated to a kiln head air feeder 1b, the kiln head air feeder 1b is communicated to an inlet of a heat exchange tube 28 of a brine heater 6b, and an outlet of the heat exchange tube 28 of the brine heater 6b is communicated to the atmosphere through a chimney 4 b.
The seawater supply port 21 is communicated with a cooling pipe 27 in the heat exhaust section 8b, one path of an outlet of the cooling pipe 27 in the heat exhaust section 8b is communicated with the outside to exhaust seawater, the other path is communicated with the inside of the heat exhaust section 8b, and a water outlet 29 of the heat exhaust section is communicated with the cooling pipes 27 connected in series with the evaporation chambers 11b of each stage of the heat recovery section 7b and then is introduced into the brine heater 6 b; the outlet of the brine heater 6b is communicated into the evaporation chambers 11b of each stage in sequence, and the outlet of the evaporation chamber 11b of the last stage is communicated to the heat discharge section 8b and then communicated to the concentrated brine conveying system 10b through the heat discharge section 8 b; the water vapor evaporated in the heat discharging section 8b and the evaporation chambers 11b of each stage are respectively communicated with the fresh water collecting and conveying system 9b after being cooled by the cooling pipes 27 therein.
Optionally, the heat rejection section 8b comprises a plurality of stages of evaporation chambers 11b in series.
The direct waste heat source cement production and seawater desalination combined implementation method based on the direct waste heat source cement production and seawater desalination combined implementation system in the embodiment is that clean flue gas is generated after dust removal treatment is carried out on flue gas discharged by the grate cooler 11 of the cement system 10, the clean flue gas is sent into the seawater desalination system 20 through the kiln head blower 1b, the temperature is reduced after heat exchange is carried out in the seawater desalination system 20, and the clean flue gas is discharged into the atmosphere through the chimney 4 b;
the seawater desalination system 20 comprises a brine heater 6b, a heat recovery section 7b, a heat discharge section 8b, a fresh water collecting and conveying system 9b and a concentrated brine conveying system 10b, wherein the heat recovery section 7b is provided with a plurality of stages of evaporation chambers 11b connected in series; the clean flue gas is sent to a brine heater 6b of a seawater desalination system 20;
the pretreated seawater is firstly sent into a heat discharging section 8b as cooling water, most of the cooling seawater leaving the heat discharging section 8b is discharged back to the sea, and the small part of the cooling seawater is used as feeding seawater, enters the heat discharging section 8b after being subjected to oxygen removal pretreatment, then the circulating brine is sent into a heat recovery section 7b from the heat discharging section 8b through a water pump to recover the heat of flash evaporation fresh water steam, and then is heated by the high-grade steam through a brine heater 6b, wherein the brine reaches the highest temperature required by the process; the heated circulating brine enters an evaporation chamber 11b of a first stage of the heat recovery section 7b, the pressure in the evaporation chamber 11b is controlled to be lower than the saturated vapor pressure corresponding to the temperature of the hot brine, so that the hot brine is changed into superheated water after entering the evaporation chamber 11b and is rapidly and partially vaporized, the temperature of the hot brine is reduced, the generated vapor is condensed into required fresh water, and the required fresh water enters a fresh water collecting and conveying system 9 b; meanwhile, the brine is gradually thickened until the temperature is close to the temperature of the natural seawater downwards; the concentrated brine is discharged from the heat extraction section 8b and enters a concentrated brine conveying system 10b for preparing salt or extracting bromine.
By integrating the embodiment, the direct waste heat source cement production and seawater desalination combined implementation system and the corresponding direct waste heat source cement production and seawater desalination combined implementation system provided by the scheme are fully suitable for being implemented in remote sea areas, especially areas lacking fresh water, have high energy utilization rate, and can meet or at least partially meet the beneficial effects of the areas on fresh water utilization.
In addition, in this embodiment, the kiln head waste heat flue gas may also be replaced by kiln tail waste heat flue gas, bypass air discharge flue gas, or any one of the three or a combination of any two or three.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (6)
1. A direct waste heat source cement production and seawater desalination combined implementation method is characterized in that:
the method comprises the following steps that clean flue gas generated after dust removal treatment is carried out on kiln head flue gas, kiln tail flue gas and bypass air discharge gas exhausted from a cement system respectively, all paths of clean flue gas are sent into a seawater desalination system through a kiln head air feeder, a kiln tail air feeder and a bypass air discharge air feeder respectively, the temperature is reduced after heat exchange is carried out in the seawater desalination system, and the clean flue gas is exhausted into the atmosphere through a chimney;
the seawater desalination system comprises a fresh water collecting and conveying system, a strong brine conveying system, a condenser and a multi-stage evaporator; clean flue gas is sent into a first evaporator of a seawater desalination system;
the pretreated seawater passes through a condenser and then enters a first stage of an evaporator to exchange heat with clean flue gas from a cement system; part of seawater is vaporized in the evaporator due to heat absorption, the concentrated seawater sequentially enters each evaporator connected in series behind the first-stage evaporator for repeated evaporation, steam evaporated by the former-stage evaporator is used as a heat source of the next-stage evaporator, the heat release part in the next-stage evaporator is condensed into fresh water, the fresh water enters the fresh water collecting and conveying system, and concentrated brine concentrated in the last-stage evaporator enters the concentrated brine conveying system.
2. The direct waste heat source cement production and seawater desalination combined implementation method according to claim 1, characterized in that:
and the concentrated strong brine in the last stage of evaporator enters a strong brine conveying system and is used for preparing salt or extracting bromine.
3. A direct waste heat source cement production and seawater desalination combined implementation method is characterized in that:
the method comprises the following steps that clean flue gas is generated after dust removal treatment is carried out on flue gas discharged by a grate cooler of a cement system, the clean flue gas is sent into a seawater desalination system through a kiln head air feeder, the temperature is reduced after heat exchange is carried out in the seawater desalination system, and the flue gas is discharged into the atmosphere through a chimney;
the seawater desalination system comprises a brine heater, a heat recovery section, a heat discharge section, a fresh water collecting and conveying system and a strong brine conveying system, wherein the heat recovery section is provided with multistage evaporation chambers connected in series; clean flue gas is sent into a brine heater of a seawater desalination system;
the pretreated seawater is firstly sent into a heat discharging section to be used as cooling water, most of the cooling seawater leaving the heat discharging section is discharged back to the sea, and the small part of the cooling seawater is used as feeding seawater, enters the heat discharging section after being subjected to oxygen removal pretreatment, then the circulating brine is sent into a heat recovering section from the heat discharging section through a water pump to recover heat of flash evaporation fresh water steam, and then is heated by the high-grade steam through a brine heater, wherein the brine reaches the highest temperature required by the process; the heated circulating saline water enters an evaporation chamber of a first stage of a heat recovery section, the pressure in the evaporation chamber is controlled to be lower than the saturated vapor pressure corresponding to the temperature of the hot saline water, so that the hot saline water is changed into superheated water and is rapidly and partially vaporized after entering the evaporation chamber, the temperature of the hot saline water is reduced, the generated vapor is condensed into required fresh water, and the required fresh water enters a fresh water collecting and conveying system; meanwhile, the brine is gradually thickened until the temperature of the brine is close to the temperature of the natural seawater downwards; and discharging the strong brine from the heat extraction section, and feeding the strong brine into a strong brine conveying system for preparing salt or extracting bromine.
4. A direct waste heat source cement production and sea water desalination combined implementation system is characterized in that:
comprises a cement system and a seawater desalination system;
the cement system comprises a grate cooler, a rotary kiln and a preheater; wherein the grate cooler is connected with the rotary kiln, and the rotary kiln is communicated with the decomposing furnace of the preheater through a smoke chamber;
the seawater desalination system comprises a fresh water collecting and conveying system, a strong brine conveying system, a condenser and a multi-stage evaporator; the seawater water supply inlet passes through a cooling pipe of the condenser and then respectively enters each stage of evaporator; the evaporator of each stage is respectively provided with a strong brine outlet at the lower part and a vapor outlet at the upper part;
the grate cooler is provided with an air suction port which is communicated to a dust remover, the dust remover is communicated to a kiln head air feeder, the kiln head air feeder is communicated to a heat exchange tube inlet of a first-stage evaporator of the seawater desalination system, and a heat exchange tube outlet of the first-stage evaporator is communicated to the atmosphere through a chimney;
in the seawater desalination system, a strong brine outlet of a previous stage evaporator is connected into a next stage evaporator, a vapor outlet of the previous stage evaporator is communicated with a heat exchange tube of the next stage evaporator and is used as a heat source of the next stage evaporator, and the strong brine outlet is communicated to a fresh water collecting and conveying system through an outlet end of the heat exchange tube of the next stage evaporator after releasing heat; the strong brine outlet of the last stage of evaporator is communicated to a strong brine conveying system, and the steam outlet of the last stage of evaporator is communicated into the condenser to discharge heat to seawater in the condenser and then liquefy the seawater and flow into a fresh water collecting and conveying system.
5. A direct waste heat source cement production and sea water desalination combined implementation system is characterized in that:
comprises a cement system and a seawater desalination system;
the cement system comprises a grate cooler;
the seawater desalination system comprises a brine heater, a heat recovery section, a heat discharge section, a fresh water collecting and conveying system and a strong brine conveying system, wherein the heat recovery section is provided with multistage evaporation chambers connected in series;
the grate cooler is provided with an air suction port which is communicated to a dust remover, the dust remover is communicated to a kiln head air feeder, the kiln head air feeder is communicated to an inlet of a heat exchange tube of the brine heater, and an outlet of the heat exchange tube of the brine heater is communicated to the atmosphere through a chimney;
the seawater supply port is communicated with a cooling pipe in the heat extraction section, one path of an outlet of the cooling pipe in the heat extraction section is communicated with the outside to discharge seawater, the other path of the outlet is communicated with the inside of the heat extraction section, and a water outlet of the heat extraction section is communicated with the cooling pipes of the heat recovery section in series connection with each stage of evaporation chambers and then is introduced into a brine heater; the outlet of the brine heater is sequentially communicated into the evaporation chambers of all stages, and the outlet of the evaporation chamber of the last stage is communicated to the heat discharge section and then communicated to the brine conveying system through the heat discharge section; and fresh water of the heat discharging section and the steam evaporated in each stage of evaporation chamber after being cooled by the cooling pipes in the heat discharging section and each stage of evaporation chamber is respectively communicated with a fresh water collecting and conveying system.
6. The direct waste heat source cement production and seawater desalination combined realization system according to claim 5, characterized in that:
the heat removal section includes a plurality of stages of evaporation chambers connected in series.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202116342U (en) * | 2011-06-27 | 2012-01-18 | 哈尔滨汽轮机厂辅机工程有限公司 | Industrial exhaust heat low-temperature multiple-effect seawater desalinization system |
| DE102012112215A1 (en) * | 2012-12-13 | 2014-06-18 | Technische Universität München | Process and plant for the treatment and processing of water |
| CN104048297A (en) * | 2014-06-23 | 2014-09-17 | 杨义军 | Cement kiln cooperative processing combustible waste and by-pass exhaust power generation complementary system |
| CN104402079A (en) * | 2014-11-18 | 2015-03-11 | 潍坊联兴新材料科技股份有限公司 | Industrial waste heat type low-temperature multi-effect sea water desaltation system and sea water desaltation method thereof |
| CN204417165U (en) * | 2014-12-27 | 2015-06-24 | 石家庄新华能源环保科技股份有限公司 | A kind of device of industrial gaseous waste heat recovery |
| CN207991295U (en) * | 2018-03-22 | 2018-10-19 | 成都建筑材料工业设计研究院有限公司 | A kind of cement kiln depth waste heat recovery collaboration refuse burning system |
| CN109855433A (en) * | 2019-03-28 | 2019-06-07 | 成都建筑材料工业设计研究院有限公司 | It is a kind of to heat Turbo-generator Set condensate system using cement kiln low temperature exhaust heat |
| CN110217848A (en) * | 2019-05-30 | 2019-09-10 | 郑州电力高等专科学校 | The seawater desalination system utilized based on Combined cycle gas-steam turbine fume afterheat |
-
2020
- 2020-09-17 CN CN202010976970.0A patent/CN111908543A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202116342U (en) * | 2011-06-27 | 2012-01-18 | 哈尔滨汽轮机厂辅机工程有限公司 | Industrial exhaust heat low-temperature multiple-effect seawater desalinization system |
| DE102012112215A1 (en) * | 2012-12-13 | 2014-06-18 | Technische Universität München | Process and plant for the treatment and processing of water |
| CN104048297A (en) * | 2014-06-23 | 2014-09-17 | 杨义军 | Cement kiln cooperative processing combustible waste and by-pass exhaust power generation complementary system |
| CN104402079A (en) * | 2014-11-18 | 2015-03-11 | 潍坊联兴新材料科技股份有限公司 | Industrial waste heat type low-temperature multi-effect sea water desaltation system and sea water desaltation method thereof |
| CN204417165U (en) * | 2014-12-27 | 2015-06-24 | 石家庄新华能源环保科技股份有限公司 | A kind of device of industrial gaseous waste heat recovery |
| CN207991295U (en) * | 2018-03-22 | 2018-10-19 | 成都建筑材料工业设计研究院有限公司 | A kind of cement kiln depth waste heat recovery collaboration refuse burning system |
| CN109855433A (en) * | 2019-03-28 | 2019-06-07 | 成都建筑材料工业设计研究院有限公司 | It is a kind of to heat Turbo-generator Set condensate system using cement kiln low temperature exhaust heat |
| CN110217848A (en) * | 2019-05-30 | 2019-09-10 | 郑州电力高等专科学校 | The seawater desalination system utilized based on Combined cycle gas-steam turbine fume afterheat |
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