CN203097975U - Vapor Rankine and ammonia vapor Rankine combined cycle electricity generation device - Google Patents

Abstract

The utility model relates to a steam Rankine-ammonia steam Rankine combined cycle power generation device. The steam in the steam Rankine cycle is cooled by the ammonia vapor in the ammonia steam Rankine cycle, and the latent heat of vaporization of the steam in the steam Rankine cycle is recovered for use in the steam Rankine cycle. Ammonia steam Rankine cycle power generation, so that the steam Rankine-ammonia steam Rankine cycle is combined to form a combined cycle device that can be implemented, and at the same time solves the safety problem of ammonia steam Rankine cycle recovery of flue gas waste heat, effectively reducing smoke exhaust temperature and avoid low-temperature corrosion of flue gas, waste gas, waste water and waste heat of steam Rankine cycle system can be effectively recycled and utilized. The utility model can be used not only for the energy-saving transformation of existing units, but also for the design and construction of newly-built units, and is especially suitable for newly-built, expanded and rebuilt generating units in water-shortage areas and power-shortage areas, with remarkable economic, social and environmental benefits .

Description

Steam Rankine-Ammonia Steam Rankine Combined Cycle Power Plant

technical field

The invention relates to a steam Rankine-ammonia steam Rankine combined cycle power generation device, specifically belonging to the technical field of thermal power plant power devices.

Background technique

A thermal power plant that uses water vapor as a working medium is a large-scale factory that converts thermal energy into mechanical energy, and then converts mechanical energy into electrical energy. The cycle applied in power plants is very complicated, but in essence, it is mainly completed by the Rankine cycle composed of boilers, steam turbines, condensers, water pumps and other equipment. The working principle is: the feed water is first pressurized by the feed water pump and then sent Into the boiler, the water in the boiler is heated and vaporized to form high-temperature and high-pressure superheated steam. The superheated steam expands and does work in the steam turbine and becomes low-temperature and low-pressure exhaust steam. Finally, it is discharged into the condenser to condense into condensed water, and the condensed water will be condensed by the water pump again. Water is sent to the boiler for a new cycle. As for the complex cycle used in thermal power plants, it is just a new cycle formed on the basis of the Rankine cycle in order to improve thermal efficiency, that is, the heat recovery cycle, and the heat recovery medium is water. The Rankine cycle has become the basic cycle of modern steam power plants.

Without exception, all modern large and medium-sized steam power plants use steam extraction to heat feed water and reheat cycle. After using steam extraction and reheat to heat feed water, the temperature of feed water is increased, thereby increasing the average temperature of heating. In addition to significantly improving the thermal efficiency of the cycle, Although the steam consumption rate has increased, the steam exhaust rate decreases due to the step-by-step steam extraction, which is conducive to the improvement of the ratio of actual work to theoretical work, that is, the relative internal efficiency η _oi of the cycle, and solves the problem of high-power steam turbines at the same time. The volume of the condenser can also be reduced accordingly due to the difficulty of the limitation of the flow capacity of the last stage blades. However, when the steam condenses in the condenser, it still releases a large amount of latent heat of vaporization, which requires a large amount of water or air for cooling, which wastes heat, causes thermal pollution, and wastes electricity and water resources. Therefore, how to effectively utilize the large amount of latent heat of vaporization released during the condensation of steam in the condenser is worthy of further study.

A large amount of flue gas is emitted during the production process of power plant boilers, and a lot of heat can be recovered. During the operation of power plant boilers, it is necessary to ensure that the water quality of the boilers meets the safety requirements through continuous and regular sewage discharges. At the same time, the oxygen in the boiler feed water must be removed to avoid corrosion of the boiler system. At present, the thermal deaerator is the preferred technology for power plant boilers. While the deaerator is working, it entrains a large amount of working steam and discharges it into the atmosphere. Since boiler drainage and deaerator exhaust steam contain a lot of heat and excellent water quality, direct discharge will cause great waste of energy and resources, and cause pollution to the environment. Although the waste heat resources of these two parts are huge waste, it is difficult to recycle them. The main reasons are: (1) the quality of waste heat is low, and no effective utilization method has been found; It is risky to make major changes to the original thermal system of the boiler; (3) The problem of heat balance is difficult to organize, and it is difficult to directly use all the inside of the factory. It is often necessary to find suitable heat users outside, and the heat consumption of heat users Loads tend to fluctuate, limiting the versatility of the recovery method.

Gu Wei et al. (Research status and development trend of low temperature thermal power generation [J]. Thermal Power Engineering. 2007.03.Vol.22, No.2.) introduced the research status and development trend of low temperature thermal power generation technology at home and abroad. Judging from the development of low-temperature thermal power generation technology research in recent years, the research work mainly focuses on the research on the working medium of the power cycle and the improvement and optimal control of the cycle process. Theoretically, the Kalina cycle, the ammonia absorption dynamic refrigeration compound cycle, etc. can achieve higher energy utilization than the simple cycle. Low-temperature thermal power generation based on finite-time thermodynamics is of great significance when considering the influence of time-varying factors on the system, and it is possible to maximize the energy utilization of the system. Improving power generation efficiency and environmental protection are the core contents of low-temperature thermoelectric technology. The Kalina cycle, ammonia absorption dynamic refrigeration compound cycle and other theories mentioned in this paper are worthy of attention.

The Kalina cycle power generation technology mentioned above also has its inherent disadvantages: For example, ammonia is flammable, explosive and toxic. When using the waste heat of flue gas to organize Kalina cycle power generation in the tail flue of boilers or industrial furnaces, it must To consider the leakage caused by dust in the flue gas caused by wear and corrosion of the heat exchanger arranged in the flue, it is necessary to consider the resulting explosion protection and the protection of the environment and working place; the ammonia-water mixture as the working medium Karina cycle, ammonia in ammonia water is a flammable, explosive and toxic medium. This is a difficult problem that must be solved when the Kalina cycle power generation technology recovers the waste heat of flue gas containing dust and corrosive substances in the power station system.

Therefore, how to use the basic law of thermodynamics of the steam Rankine cycle thermal power plant, learn from the innovative methods of the double Rankine cycle organization idea and the compound cycle theory such as Rankine-Kalina, and retain the advantages of the power plant technology based on the Rankine cycle principle, discuss The new compound cycle theory and the real finding of a new way to greatly improve the thermal efficiency of the thermodynamic cycle power plant have become the difficulties of research in this field.

Contents of the invention

The purpose of the present invention is to solve the shortcomings of the above-mentioned steam Rankine cycle and Karina cycle and other technologies, and propose a steam Rankine-ammonia steam Rankine combined cycle power generation device, which can replace the traditional steam Rankine cycle unit and solve the problem at the same time The key issues of the safe operation of the ammonia steam Rankine cycle unit and the recovery of a large amount of latent heat of vaporization released during the condensation of the steam in the condenser are solved, and the positive pressure operation mode of the condenser is adopted to recover the vaporization of the steam condensed in the steam Rankine cycle The latent heat is used for power generation in the rankine cycle of ammonia steam at the low temperature end, so as to effectively improve the thermal efficiency of the entire combined cycle unit, and finally achieve the purpose of saving energy and reducing consumption and improving the thermal efficiency of the system.

The object of the present invention is achieved by the following measures: a steam Rankine-ammonia steam Rankine combined cycle power generation unit, which comprises a steam Rankine cycle and an ammonia steam Rankine cycle, characterized in that:

The steam Rankine cycle refers to the saturated steam 2 coming out of the boiler body 1, passing through the heater 3 to form superheated steam 3-1, and sending it into the steam turbine 4 to drive the steam generator 21 to generate electricity; the exhaust steam 5 coming out of the steam turbine 4 passes through Heater 9 and condensing evaporator 10 form condensed water 6, and condensed water 6 passes through feed water pump 7, feed water heater 8, and boiler body 1 to generate saturated steam, thereby forming a steam Rankine cycle.

The described ammonia vapor Rankine cycle refers to that the ammonia liquid 11 is sent to the condensation evaporator 10, the cooling evaporator 13, and the ammonia evaporator 14 respectively or sequentially through the ammonia liquid circulation pump 12, and the ammonia vapor produced passes through the heater 9 to form ammonia The superheated steam 16 enters the ammonia steam turbine 17 again, drives the ammonia generator 20 to generate electricity, and the exhausted steam discharged from the ammonia steam turbine 17 is cooled by the ammonia condenser 18 to form ammonia liquid 11, and then enters the ammonia liquid circulating pump 12 to form ammonia steam. Ken loops.

The ammonia liquid 11 is single-component ammonia, or a mixed solution with ammonia as a low boiling point component and a high boiling point component as an absorbent, such as ammonia-water solution, ammonia-ammonia thiocyanate solution or ammonia-calcium chloride solution etc.

When the ammonia liquid adopts a multi-component solution, the ammonia liquid 11 is sequentially or respectively sent into the condensation evaporator 10, the cooling evaporator 13, and the ammonia evaporator 14 through the ammonia liquid circulation pump 12 or the regenerator 15, forming the The lean liquid returns to the ammonia condenser 18 through the regenerator 15 and the return line 19, and the ammonia vapor produced passes through the heater 9, the ammonia steam turbine 17, the ammonia evaporator 14, and the ammonia condenser 18 to form the ammonia liquid 11, and then returns to the ammonia liquid Circulation pump 12, thereby forming an ammonia vapor Rankine cycle loop.

The pressure of the exhaust steam 5 discharged from the steam turbine 4 is higher than the atmospheric pressure.

The steam Rankine cycle loop and the ammonia steam Rankine cycle loop pass through the superheater 9, the condensation evaporator 10, or the cooling evaporator 13, or the ammonia evaporator 14, and the high-temperature end steam Rankine cycle and the low-temperature end ammonia The steam Rankine cycle is organically combined to efficiently recover the latent heat of vaporization released during the condensation of steam at the high temperature end of the steam Rankine cycle and use it for power generation in the low temperature end ammonia steam Rankine cycle.

The heat exchange medium ammonia liquid and the flue gas of the cooling evaporator 13 adopt a separate heat exchange method, and the cooling evaporator 13 includes an evaporator 13-1 and a condenser 13-2, wherein the evaporator 13-1 is arranged in the flue In 23, the condenser 13-2 is arranged outside the flue 23, and the phase change working medium therein adopts water or other suitable substances; the phase change working medium absorbs the heat of the flue gas in the evaporator 13-1 to generate saturated steam, and the saturated steam As the heat source of the ammonia liquid, the steam exchanges heat with the ammonia liquid 11 through the condenser 13-2, forms a condensate after cooling, and then absorbs the heat of the flue gas by the evaporator 13-1 to generate steam, thereby forming a phase change working medium. Internal circulation loop; phase change working medium adopts natural circulation or forced circulation.

There is a exhaust steam regenerator 22: the ammonia vapor generated by the ammonia evaporator 14 passes through the exhaust steam regenerator 22, the superheater 9, the ammonia steam turbine 17, the exhaust steam regenerator 22, the ammonia evaporator 14, the ammonia condenser 18, The ammonia liquid circulation pump 12 returns to the ammonia evaporator 14, thereby forming an ammonia vapor Rankine cycle loop.

There is a supply water system matching the steam Rankine cycle system: the distilled water 24 in the distilled water tank 25 is replenished into the steam Rankine cycle system after being deoxidized by the water supply pump 26, the normal temperature deaerator 27, and the mixed bed 28 desalinated.

The feed water heater 8, the ammonia superheater 9, the condensing evaporator 10, the cooling evaporator 13, the ammonia evaporator 14, and the exhaust steam regenerator 22 can be respectively provided with one or more in series, parallel or mixed connection connect.

The air 30 sent by the blower 31 enters the air preheater 32, forms hot air 33, enters the combustion equipment 34 to participate in combustion, and the generated high-temperature flue gas passes through the boiler body 1, the superheater 2, the feed water heater 8, and the air preheater 32 1. The evaporator 13-1 lowers the temperature and discharges it.

The ammonia condenser 18 is arranged according to conventional technology, and water or air is used as cooling medium.

The heat exchange elements of the aforementioned equipment mentioned in the present invention can adopt row tubes, finned tubes, serpentine tubes or spiral groove tubes, or tubes with other heat transfer enhancement measures or other types of hollow cavity heat exchange elements.

Control the wall temperature of the heat exchange surface of the evaporator 13-1 to be slightly higher than the acid dew point temperature of the flue gas, or use corrosion-resistant materials to effectively reduce the low-temperature corrosion of the flue gas, which can effectively reduce the exhaust gas temperature and avoid low-temperature corrosion of the flue gas. Efficient recovery of flue gas waste heat.

Equipment not described in the present invention and its backup system, pipelines, instruments, valves, heat preservation, bypass facilities with regulating functions, etc. are matched by well-known mature technologies.

Equipped with a matching control device for the system of the present invention, the well-known mature control technology of the existing steam Rankine cycle power plant, Cheng's cycle power plant or gas-steam combined cycle power plant is used for matching, so that the steam Rankine-Karin The Na combined cycle power generation device can operate economically, safely and with high thermal efficiency, achieving the purpose of saving energy and reducing consumption.

Compared with the prior art, the present invention has the following advantages:

1. Remarkable energy-saving effect: The steam Rankine-Karina combined cycle power generation device designed by the present invention is different from the traditional steam Rankine cycle based on the principle of Rankine cycle and the Karina cycle using flue gas as a heat source. The combined cycle system adopts the positive pressure operation mode of the condenser, and uses the exhaust steam of the steam turbine as the heat source of the Kalina cycle. The use of the Kalina cycle system has the characteristics of higher efficiency in the utilization of medium and low temperature heat sources. The condenser and the card The evaporators in the Linna cycle are ingeniously combined, and the latent heat of vaporization of the steam is effectively utilized. In addition to the higher efficiency of steam sensible heat utilization compared with the steam Rankine cycle, only using the latent heat of vaporization of steam to generate electricity is more The absolute thermal efficiency of the whole system is increased by more than 2% because the back pressure is operated in a positive pressure mode, and the exhaust steam at the outlet of the steam turbine can guarantee a certain degree of superheat. The initial steam pressure of the newly built unit can be supercritical or Ultra-supercritical pressure further improves the thermal efficiency of the power generation cycle.

2. Equipment investment is low, and operating costs are greatly reduced:

(1) Eliminates the inevitable air leakage and water leakage of the traditional condenser negative pressure operation technology, and does not need to install deaerators and air extractors in the Rankine cycle, avoiding the operation of traditional deaerators, air extractors, etc. The loss of soda water caused by traditional technology avoids the pollution of condensed water recovery and the loss of soda water, and only needs to supplement a very small amount of water loss caused by steam leakage from the shaft seal of the steam turbine, which can be replenished into the system through purchased or self-made distilled water;

(2) Due to the positive pressure and closed operation, the oxygen corrosion and scaling phenomena of the traditional Rankine cycle boiler system are avoided, the loss of soda and water in the system is greatly reduced, and there is no need to equip a large and complicated chemical water treatment system, and the operating cost of the water treatment system A sharp drop, the absolute value can be reduced by 90%;

(3) Because the exhaust steam specific volume of the steam turbine is much smaller than that of the traditional condenser, the volume of the steam turbine can be greatly reduced, and the volume of the condenser is much smaller than that of the traditional technology, so the relative price of the steam turbine and condenser equipment Lower a lot.

3. Integrated utilization of the three wastes in the power plant: When the heat exchanger installed in the tail flue adopts a phase-change heat exchanger, the waste heat of the flue gas can be recovered efficiently, and the exhaust gas temperature can be reduced to about 120°C. The phase-change heat exchanger evaporator When corrosion-resistant materials are used, the exhaust gas temperature can be reduced even more, reaching about 85°C, which is extremely beneficial to the operation of the desulfurization and denitrification system. While effectively avoiding low-temperature corrosion of the flue gas, the recovered heat is used for efficient power generation in the Karina cycle system. It is more in line with the principle of energy cascade utilization. Waste heat such as waste water and waste steam generated by the steam Rankine cycle system can be recycled into the Karina cycle system. It fundamentally eliminates the influence of other waste gas, waste water, and waste steam waste heat recovery devices on the thermal cycle system of the entire unit, and realizes the true integrated utilization of waste heat in the entire power plant system, with obvious effects of saving water, steam, and electricity.

4. Significantly improved operational safety:

(1) Because the back pressure of the steam turbine in the steam Rankine cycle is operated in a positive pressure mode, the exhaust steam at the outlet of the steam turbine can ensure a certain degree of superheat, which overcomes the design and Operation and safety issues, the steam turbine operates under back pressure and positive pressure, and the outlet steam is superheated steam, which fundamentally eliminates the problems caused by wet steam in the last stage blade of the steam turbine in the traditional steam Rankine cycle Design, manufacturing and operation problems, steam turbine The operating conditions of the engine have been optimized, and the vibration of the steam turbine generator set has been significantly improved compared with before;

(2) The oxygen corrosion safety performance of the steam boiler system has been significantly improved, avoiding the oxygen corrosion hazards caused by the inevitable leakage of air into the system due to the negative pressure operation of the condenser of the traditional steam Rankine cycle generator set;

(3) The scale hazard of the steam Rankine cycle system is eliminated, effectively reducing the occurrence of accidents such as overheating and bursting of the heating surface, and the operating conditions of the superheater are significantly improved, and the safety is significantly improved;

(4) Compared with the traditional Kalina cycle technology, when adopting the optimal scheme, there is no need to install a partition-type heat exchanger in the flue, and instead use a split-type phase-change heat exchanger with better safety to separate the condenser The heat of the flue gas is recovered in a single way, and many safety problems caused by the contact of the ammonia-water mixture with the flue gas due to wear and corrosion caused by dust in the flue gas and corrosive media have been fundamentally solved; the ammonia-water mixture is in the condenser of the phase-change heat exchanger Partition-wall heat exchange is carried out, because of the excellent characteristics of water vapor, such as non-toxic, non-combustible substances, non-flammable, and flame-retardant, even if leakage occurs, the accident can be easily handled and controlled. The evaporator or overheating in the Karina cycle The operating condition of the device has been significantly improved;

(5) Since the exhaust steam of the steam Rankine cycle adopts positive pressure, it can be led to a safe place with reliable protective measures through pipelines, and the Kalina cycle system (including phase change heat exchanger condenser) can be independently installed in a safe and reliable place. The protective space is equipped with reliable safety facilities to avoid many problems caused by direct interweaving with the steam Rankine cycle system. The safety of the Karina cycle system is reliably guaranteed, further eliminating potential safety hazards for its industrial application.

Description of drawings

Fig. 1 is a schematic flow chart of a steam Rankine-ammonia steam Rankine combined cycle power generation device of the present invention.

In Figure 1: 1-boiler body, 2-saturated steam, 3-superheater, 3-1-superheated steam, 4-steam turbine, 5-exhaust steam, 6-condensed water, 7-feedwater pump, 8-feedwater heater , 9-superheater, 10-condensing evaporator, 11-ammonia liquid, 12-ammonia liquid circulation pump, 13-cooling evaporator, 13-1-evaporator, 13-2-condenser, 14-ammonia evaporator, 15-Regenerator, 16-Ammonia superheated steam, 17-Ammonia steam turbine, 18-Ammonia condenser, 19-Return liquid, 20-Ammonia generator, 21-Steam generator, 22-Spent steam regenerator, 23 -flue, 24-distilled water, 25-distilled water tank, 26-makeup water pump, 27-deaerator, 28-mixed bed, 29-return water pipeline, 30-air, 31-blower, 32-air preheater, 33 - Combustion equipment.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1.

As shown in Figure 1, a steam Rankine-ammonia steam Rankine combined cycle power generation device, the device includes a steam Rankine cycle and an ammonia steam Rankine cycle system, specific examples are as follows:

The ammonia steam Rankine cycle uses a mixture of ammonia and water.

The steam Rankine cycle refers to the saturated steam 2 coming out of the boiler body 1, passing through the heater 3 to form superheated steam 3-1, and sending it into the steam turbine 4 to drive the steam generator 21 to generate electricity; the exhaust steam 5 coming out of the steam turbine 4 passes through Heater 9 and condensing evaporator 10 form condensed water 6, and condensed water 6 passes through feed water pump 7, feed water heater 8, and boiler body 1 to generate saturated steam, thereby forming a steam Rankine cycle.

In the ammonia vapor Rankine cycle, the condensation evaporator 10, the cooling evaporator 12, and the ammonia evaporator 14 are operated in parallel, and the ammonia liquid 11 passes through the ammonia liquid circulation pump 12, the regenerator 15, and the condensation evaporator 10. Ammonia liquid circulation pump 12, ammonia evaporator 14, exhaust steam regenerator 22, and ammonia liquid circulation pump 12, condensing evaporator 10, ammonia vapor generated passes through heater 9, ammonia steam turbine 17, exhaust steam regenerator 22 , ammonia evaporator 14, and ammonia condenser 18 form ammonia liquid 11, and then enter the ammonia liquid circulation pump 12, thereby forming an ammonia vapor Rankine cycle loop.

The pressure of the exhaust steam 5 discharged from the steam turbine 4 is higher than the atmospheric pressure.

The heat exchange medium ammonia liquid and the flue gas of the cooling evaporator 13 adopt a separate heat exchange method, and the cooling evaporator 13 includes an evaporator 13-1 and a condenser 13-2, wherein the evaporator 13-1 is arranged in the flue In 23, the condenser 13-2 is arranged outside the flue 23, and the phase change working medium is water; the phase change working medium absorbs the heat of the flue gas in the evaporator 13-1 to generate saturated steam, and the saturated steam is in the condenser 13 In -2, as the heat source of the ammonia liquid, it exchanges heat with the ammonia liquid 11 through the condenser 13-2, forms a condensate after cooling, and then absorbs the heat of the flue gas to generate steam by the evaporator 13-1, thereby forming a phase change The internal circulation loop of the working fluid; the phase change working fluid adopts natural circulation.

There is a supply water system matching the steam Rankine cycle system: the distilled water 24 in the distilled water tank 25 is replenished into the steam Rankine cycle system after being deoxidized by the water supply pump 26, the normal temperature deaerator 27, and the mixed bed 28 desalinated.

The air 30 sent by the blower 31 enters the air preheater 32, forms hot air 33, enters the combustion equipment 34 to participate in combustion, and the generated high-temperature flue gas passes through the boiler body 1, the superheater 2, the feed water heater 8, and the air preheater 32 1. The evaporator 13-1 lowers the temperature and discharges it.

One or more of the feed water heater 8, superheater 9, condensation evaporator 10, cooling evaporator 13, ammonia evaporator 14, and exhaust steam regenerator 22 can be set respectively, and connected in series, parallel or mixed connection .

The ammonia condenser 18 is arranged according to conventional technology, and water or air is used as cooling medium.

The heat exchange elements of the aforementioned equipment mentioned in the present invention can adopt row tubes, finned tubes, serpentine tubes or spiral groove tubes, or tubes with other heat transfer enhancement measures or other types of hollow cavity heat exchange elements.

Control the wall temperature of the heat exchange surface of the evaporator 13-1 to be slightly higher than the acid dew point temperature of the flue gas, or use corrosion-resistant materials to effectively reduce the low-temperature corrosion of the flue gas, which can effectively reduce the exhaust gas temperature and avoid low-temperature corrosion of the flue gas. Efficient recovery of flue gas waste heat.

Equipment not described in the present invention and its backup system, pipelines, instruments, valves, heat preservation, bypass facilities with regulating functions, etc. are matched by well-known mature technologies.

Equipped with a matching control device for the system of the present invention, the well-known mature control technology of the existing steam Rankine cycle power plant, Cheng's cycle power plant or gas-steam combined cycle power plant is used for matching, so that the steam Rankine-Karin The Na combined cycle power generation device can operate economically, safely and with high thermal efficiency, achieving the purpose of saving energy and reducing consumption.

Although the present invention has been disclosed above with preferred embodiments, they are not intended to limit the present invention, and any skilled person can make various changes or modifications without departing from the spirit and scope of the present invention. Belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims of the present application.

Claims (9)

1. steam Rankine-ammonia steam Rankine combined cycle generating unit, this device comprises steam Rankine cycle and ammonia steam Rankine cycle system, it is characterized in that:

The pressure of the exhaust steam (5) that steam turbine (4) is discharged in the described steam Rankine cycle is higher than atmospheric pressure;

Described steam Rankine cycle is meant the saturated vapour (2) that is come out by boiler body (1), forms superheated vapor (3-1) through superheater (3), sends into steam turbine (4) and drives steam-driven generator (21) generating; The exhaust steam (5) that steam turbine (4) comes out through superheater (9) or and condenser/evaporator (10), ammonia cooling by the Rankine cycle of ammonia steam forms water of condensation (6), water of condensation (6) produces saturated vapour again through feed water pump (7), boiler body (1), thereby forms steam Rankine cycle loop;

Described ammonia steam Rankine cycle loop is provided with superheater (9): ammoniacal liquor (11) is through ammoniacal liquor recycle pump (12), condenser/evaporator (10), the ammonia steam that produces forms ammonia superheated vapor (16) through superheater (9), enter ammonia steam turbine (17) again, drag ammonia generator (20) generating, the exhaust steam of discharging from ammonia steam turbine (17) forms ammoniacal liquor (11) through ammonia condenser (18) cooling, enter ammoniacal liquor recycle pump (12) again, thereby form ammonia steam Rankine cycle loop; Or ammoniacal liquor (11) is through ammoniacal liquor recycle pump (12), ammonia evaporator (14), the ammonia steam that produces forms ammonia superheated vapor (16) through superheater (9), enter ammonia steam turbine (17) again, drag ammonia generator (20) generating, the exhaust steam of discharging from ammonia steam turbine (17) forms ammoniacal liquor (11) through ammonia condenser (18) cooling, enter ammoniacal liquor recycle pump (12) again, thereby form ammonia steam Rankine cycle loop; Or ammoniacal liquor (11) is through ammoniacal liquor recycle pump (12), cooling vaporizer (13), the ammonia steam that produces forms ammonia superheated vapor (16) through superheater (9), enter ammonia steam turbine (17) again, drag ammonia generator (20) generating, the exhaust steam of discharging from ammonia steam turbine (17) forms ammoniacal liquor (11) through ammonia condenser (18) cooling, enter ammoniacal liquor recycle pump (12) again, thereby form ammonia steam Rankine cycle loop.

2. device according to claim 1 is characterized in that:

Be provided with feed water preheater (8):

Saturated vapour (2) by boiler body (1) comes out forms superheated vapor (3-1) through superheater (3), sends into steam turbine (4) and drives steam-driven generator (21) generating; The exhaust steam (5) that steam turbine (4) comes out through superheater (9) or and condenser/evaporator (10), ammonia cooling by the Rankine cycle of ammonia steam forms water of condensation (6), water of condensation (6) is through feed water pump (7), feed water preheater (8), boiler body (1), produce saturated vapour again, thereby form steam Rankine cycle loop.

3. device according to claim 2 is characterized in that:

Be provided with regenerator (15):

The lean solution that the part or all of vaporizer of condenser/evaporator (10), ammonia evaporator (14), cooling vaporizer (12) produces is got back to ammonia condenser (18) through regenerator (15), the pipeline that backflows (19); Ammoniacal liquor (11) is through ammoniacal liquor recycle pump (12), regenerator (15) or and condenser/evaporator (10) or and ammonia evaporator (14) or and the part or all of generation ammonia steam of cooling vaporizer (12).

4. device according to claim 3 is characterized in that:

Be provided with exhaust steam regenerator (22):

Ammoniacal liquor (11) forms ammoniacal liquor (11) through the ammonia steam that ammoniacal liquor recycle pump (12), ammonia evaporator (14) produce through exhaust steam regenerator (22), superheater (9), ammonia steam turbine (17), exhaust steam regenerator (22), ammonia evaporator (14), ammonia condenser (18), enter ammoniacal liquor recycle pump (12) again, thereby form ammonia steam Rankine cycle loop; Or ammoniacal liquor (11) forms ammoniacal liquor (11) through the ammonia steam that ammoniacal liquor recycle pump (12), condenser/evaporator (10) produce through exhaust steam regenerator (22), superheater (9), ammonia steam turbine (17), exhaust steam regenerator (22), condenser/evaporator (10), ammonia condenser (18), enter ammoniacal liquor recycle pump (12) again, thereby form ammonia steam Rankine cycle loop.

5. according to the described device of one of claim 1 to 4, it is characterized in that:

Flue gas in the described cooling vaporizer (13) adopts the separated type heat exchange mode with ammoniacal liquor (11): cooling vaporizer (13) comprises vaporizer (13-1), condenser (13-2), wherein vaporizer (13-1) is arranged in the flue (23), and condenser (13-2) is arranged in outside the flue (23); Phase-change working substance absorbs flue gas in vaporizer (13-1) heat produces saturated vapour, saturated vapour in condenser (13-2) as the thermal source of ammoniacal liquor, by condenser (13-2) and ammoniacal liquor (11) wall-type heat exchange, the cooling back forms condensation water again by vaporizer (13-1), the heat that absorbs flue gas produces steam again, thereby forms the interior circulation loop of phase-change working substance.

6. according to the described device of one of claim 1 to 4, it is characterized in that:

Be provided with makeup Water System: the distilled water (24) in the distilled water tank (25), mend the steam Rankine cycle system through small pump (26), normal temperature oxygen-eliminating device (27).

7. according to the described device of one of claim 1 to 4, it is characterized in that:

Be provided with mixed bed (23): the distilled water (24) in the distilled water tank (25), mend the steam Rankine cycle system through small pump (26), normal temperature oxygen-eliminating device (27), mixed bed (28).

8. according to the described device of one of claim 1 to 4, it is characterized in that:

Be provided with air preheater (32): the air (30) that gas fan (31) is sent here forms hot air (33) through air preheater (32), enter fuel-burning equipment (34) and participate in burning, the high-temperature flue gas of generation through boiler body (1), superheater (2) or and feed water preheater (8), air preheater (32) or and vaporizer (13-1) discharge after reducing temperature.

9. device according to claim 4 is characterized in that:

Described superheater (3), feed water preheater (8), superheater (9), condenser/evaporator (10), cooling vaporizer (13), ammonia evaporator (14), air preheater (32), regenerator (15), exhaust steam regenerator (22) can be provided with one or more respectively, adopt series, parallel or series-parallel connection mode to connect.

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