CN209926889U - High-temperature ultrahigh-pressure reheating waste heat boiler of heat recovery coke oven - Google Patents

Abstract

The utility model provides a pair of heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler, include: the system comprises a low-pressure evaporation system and an ultrahigh-pressure section evaporation system, wherein the ultrahigh-pressure section evaporation system comprises a protective evaporator arranged on one side in a pot body, and an ultrahigh-pressure section evaporator arranged on the other side in the pot body; the boiler body positioned at the rear end of the ultrahigh-pressure section evaporator is externally connected with an ultrahigh-pressure section boiler barrel through a first eduction tube; the ultrahigh pressure section drum is also externally connected with a protection evaporator through a downcomer, and the protection evaporator pipe is communicated with the ultrahigh pressure section drum through a second eduction pipe; the ultrahigh pressure section drum is also externally connected with an ultrahigh pressure section evaporator through a downcomer, and the ultrahigh pressure section evaporator is communicated with the ultrahigh pressure section drum through a third eduction tube. The utility model solves the defects that the prior heat recovery coke oven reheating waste heat boiler can treat the inlet steam tail gas with lower temperature and lower pressure, and the generating efficiency is lower.

Description

High-temperature ultrahigh-pressure reheating waste heat boiler of heat recovery coke oven

Technical Field

The utility model relates to a high temperature superhigh pressure exhaust-heat boiler field, concretely relates to heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler.

Background

The heat recovery coke oven refers to a coke oven in which coking coal generates coke in the coking process, chemical products, coke oven gas and some harmful substances are reasonably and fully combusted in the coke oven, and the heat of high-temperature waste gas is recovered for power generation or other purposes. The heat recovery coke oven has the advantages that due to the unique oven body structure and the unique process technology, the carbonization chamber is operated under negative pressure in the coking process, smoke dust is not leaked, chemical products are not recovered, coke oven gas is purified, and pollutants are rarely generated, so that the heat recovery coke oven solves the generation of main pollutants in the coking process, and basically realizes clean production and environmental protection. Meanwhile, as the heat recovery coke oven has wide application range of coking coal, large coke lumpiness and high quality, the application of the heat recovery coke oven shows unique superiority in China, and the heat recovery coke oven is more and more attracted by wide attention and high attention in the world coking world. The domestic heat recovery coke oven realizes mechanized operation due to coal charging and clean production, and is also called as a clean heat recovery coke oven.

The waste heat boiler technology of the heat recovery coke oven utilizes a large amount of high-temperature waste gas generated in the dry distillation process of coal in the heat recovery coke oven, the temperature of the flue gas reaches 900 ~ 1200 ℃, the heat energy in the flue gas is recovered, high-temperature steam is produced, the power generation can be carried out, the high-temperature steam can also be used for industrial production or civil heating, the emission of polluted waste gas is reduced, energy is saved, and considerable economic benefit is brought to coking enterprises.

In the prior art, as in patent document 1: the patent disclosed in CN201820804136.1 discloses a novel, the utility model provides a coke oven flue gas waste heat energy conversion and utilization boiler, which comprises a bracket and a boiler arranged on the bracket, wherein the boiler comprises a boiler main body, an upper boiler barrel used for accommodating media is arranged at the upper end of the boiler main body, a lower boiler barrel used for burning fuel is arranged at the lower end of the boiler main body, a convection pipe is arranged between the upper boiler barrel and the lower boiler barrel, convection tube is the setting of U type and the end of intaking and the play water end of convection tube all with last drum intercommunication setting, insert on the last drum lateral wall and be equipped with the inlet tube with external intercommunication, the top of going up the drum is inserted and is equipped with the outlet duct, the outlet duct links to each other with the over heater, crisscross and the slope is provided with two fire walls that keep off at least on the inside wall of pot body main part, still be equipped with the economizer that multistage vertical range and intercommunication set up each other on the support, be equipped with the connection flue between the economizer of boiler main part and top. The boiler for converting and utilizing the waste heat of the coke oven flue gas belongs to medium-temperature and medium-pressure boilers, can treat low temperature (about 600 ℃) of steam inlet tail gas and low pressure (only 2.4-3.8 MPa) of the tail gas, and causes low power generation efficiency.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model aims at providing a heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler has solved that current heat recovery coke oven reheat exhaust-heat boiler can handle the steam admission tail gas temperature lower, and tail gas pressure is lower, leads to the lower defect of generating efficiency.

Another purpose of the utility model is to provide a heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler has solved the problem that the current heat recovery coke oven reheat exhaust-heat boiler body is heated the face and is perishable.

The utility model also aims at providing a heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler has solved the easy deposition of current heat recovery coke oven reheat exhaust-heat boiler waste heat pot body heated surface, the problem of dust discharge difficulty.

(II) technical scheme

In order to solve the technical problem, the utility model provides a pair of heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler, include: the system comprises a low-pressure evaporation system and an ultrahigh-pressure section evaporation system, wherein the ultrahigh-pressure section evaporation system comprises a pot body, a protective evaporator is arranged on one side in the pot body positioned at the front end in the smoke flowing direction, and an ultrahigh-pressure section evaporator is arranged on the other side in the pot body positioned at the rear end in the smoke flowing direction;

the boiler body positioned at the rear end of the ultrahigh-pressure section evaporator is externally connected with an ultrahigh-pressure section drum through a first lead-out pipe, and the ultrahigh-pressure section drum is externally connected with a low-pressure evaporation system; the ultrahigh pressure section drum is also externally connected with a protection evaporator through a downcomer, and the protection evaporator pipe is communicated with the ultrahigh pressure section drum through a second eduction pipe; the ultrahigh pressure section drum is also externally connected with an ultrahigh pressure section evaporator through a downcomer, and the ultrahigh pressure section evaporator is communicated with the ultrahigh pressure section drum through a third eduction tube. On the first hand, the utility model adopts the arrangement of a protection evaporator, an ultrahigh pressure section evaporator and an ultrahigh pressure section boiler barrel, wherein a boiler body at the rear end of the ultrahigh pressure section evaporator is externally connected with the ultrahigh pressure section boiler barrel through a first eduction tube and is matched with a downcomer to form a first circulation loop; the ultrahigh pressure section drum is also externally connected with a protection evaporator through a downcomer, and the protection evaporator pipe is communicated with the ultrahigh pressure section drum through a second eduction pipe to form a first circulation loop; and finally, the ultrahigh pressure section boiler barrel is externally connected with an ultrahigh pressure section evaporator through a downcomer, the ultrahigh pressure section evaporator is communicated with the ultrahigh pressure section boiler barrel through a third eduction tube to form a third circulation loop, and a front protection evaporator is arranged in a high-temperature flue gas area at the inlet of the boiler, so that the temperature of the inlet flue gas of high-temperature overheat is reduced, and the pipe wall of the high-temperature evaporator is protected from overtemperature. The layout increases the temperature and the air pressure of the tail gas, has high stability, and ensures the normal work of the system under the condition of improving the temperature and the pressure of steam in the ultrahigh-pressure section evaporation system. Through the working system, the tail gas temperature of the tail end of the ultra-high pressure section evaporation system is increased and stabilized at about 900 ℃, the tail gas pressure is 13.7Mpa, and meanwhile, because the waste gas of the existing coke oven contains a certain amount of corrosive gas (sulfur dioxide), the waste gas is easy to condense on the low-temperature heated surface at the tail part of the boiler, so that the corrosion damage of the pipe is caused, and therefore, the heat recovery coke oven waste heat boiler generally has the corrosion problem of a boiler economizer, and the safety and the stability of the operation of the boiler are influenced. The utility model discloses a tail gas temperature of the terminal work of superhigh pressure section vaporization system improves and stabilizes about 900 ℃, and the tail gas temperature of boiler afterbody is higher than the critical condensation temperature of corrosive gas (sulfur dioxide), so the low temperature of having avoided the boiler afterbody receives the hot side to condense, has reduced the pipe corrosion damage condition, has improved the security and the stability of boiler operation. The utility model discloses an ultrahigh pressure parameter to take steam reheat, compare the internal heat recovery coke oven middling pressure waste heat that generally adopts and improved the generating efficiency greatly, thereby the conversion rate of the energy that improves.

Preferably, a membrane water-cooled wall is arranged on the inner side wall of the boiler body at the rear end of the ultrahigh pressure section evaporator. The utility model discloses adopt the membrane wall at the internal adoption of pot, its area is little, prevents effectively that the temperature of pot internal side wall is too high.

Preferably, the low-pressure evaporation system comprises a low-pressure section descending pipe, a low-pressure section eduction pipe, a low-pressure section boiler barrel and a low-pressure section evaporator; and two ends of the low-pressure section downcomer are respectively communicated with the low-pressure section boiler barrel and the low-pressure section evaporator, and two ends of the low-pressure section eduction tube are respectively communicated with the low-pressure section boiler barrel and the low-pressure section evaporator to form a closed loop. The utility model discloses a low pressure vaporization system and superhigh pressure section vaporization system mutually support and form second grade recovery system, and it has improved the thermal recovery efficiency of tail gas. Set up low pressure section vaporization system simultaneously, reduce exhaust gas temperature, improve boiler efficiency, guarantee simultaneously when big fluctuation appears in boiler flue gas volume and flue gas temperature, the boiler keeps comparatively stable exhaust gas temperature to protection afterbody flue gas treatment equipment and draught fan are not overtemperature.

Preferably, the pot body comprises a front channel and a rear channel, wherein the front channel is provided with a front smoke inlet positioned at the bottom and a smoke conversion port positioned at the top, the smoke conversion port is externally connected with the rear channel, and a smoke outlet is arranged at the bottom end of the rear channel. The utility model discloses a boiler adopts vertical front portion passageway and rear portion passageway side by side for two pressure systems, constitutes vertical pi type structure, more is fit for the overall arrangement of coke oven production process system, boiler compact structure, and area is little. The smoke circulation is smooth, the smoke and wind resistance of the boiler is small,

preferably, the protection evaporator is installed at the bottom end of the front channel; the ultrahigh pressure section evaporator is arranged at the upper part of the front passage, and the horizontal height of the top end of the ultrahigh pressure section evaporator is lower than the horizontal height of the bottom of the flue gas conversion port. The utility model discloses set up the super high pressure section evaporimeter and install on the upper portion of anterior passageway, and the level on its top is less than the level of flue gas conversion mouth bottom for tail gas passes through the super high pressure section evaporimeter again and handles the back, and reentrant flue gas conversion mouth has improved the utilization ratio of flue gas.

Preferably, the membrane water wall extends from the top of the front channel to the bottom of the front channel. The utility model discloses a membrane wall extends to the bottom of anterior passageway by the top of anterior passageway, and its cooling efficiency is high.

Preferably, a slag condensing pipe is arranged at the flue gas inlet, and the slag condensing pipe and the lower part of the membrane water-cooled wall at the bottom of the channel form a cooling chamber together. The utility model discloses set up the scum pipe, the cooling chamber is constituteed together to cooperation diaphragm type water-cooled wall lower part, and it condenses the filtration with low temperature reheat desuperheater in the flue gas effectively.

Preferably, an upper-level economizer and a lower-level economizer are arranged in the rear channel from top to bottom; the low-pressure section evaporator is arranged in a rear channel between the upper-level economizer and the lower-level economizer. The utility model discloses a second grade economizer, its treatment effect is more excellent.

Preferably, the upper-level economizer adopts a finned tube to be arranged behind the ultrahigh-pressure section evaporator, and the lower-level economizer adopts a light pipe to be arranged at the low-pressure section evaporator. The existing waste heat boiler also has the problems of easy dust accumulation on the heating surface and difficult dust discharge. Because high-temperature flue gas discharged by the heat recovery coke oven contains a large amount of dust particles, the dust particles are easy to accumulate on a heating surface, and particularly, dust is accumulated on a fin tube, so that the problems of poor heat exchange effect of the heating surface, increased boiler resistance and the like are caused. The utility model provides high boiler tail gas's temperature and the higher level economizer of pressure fit adopt the fin pipe to arrange behind the super high pressure section evaporimeter, and subordinate's economizer adopts the fluorescent tube to arrange at the low pressure section evaporimeter, has solved exhaust-heat boiler and still has the easy deposition of heating surface, arranges grey difficult problem.

Preferably, the high-temperature ultrahigh-pressure reheating waste heat boiler of the heat recovery coke oven further comprises a reheating system; the reheating system comprises a low-temperature reheater and a high-temperature reheater; the low-temperature reheater is arranged between the protection evaporator and the ultrahigh-pressure section evaporator; the high-temperature reheater is arranged between the protective evaporator and the low-temperature reheater; and the low-temperature reheater is communicated with the high-temperature reheater through a conversion pipe. Combine first aspect, when the temperature fluctuation of the tail gas that gets into super high pressure section evaporation system was too big (900 supplyes 1200 ℃), it handles the tail gas temperature unstability, and is undulant great, for solving this problem, the utility model discloses a reheat system for the temperature of tail gas is stabilized at 1100 ℃ 20 in the processing in the pot body, has improved the stability of system greatly, has further improved holistic stability, and then has laid solid basis for the pressure that has improved the temperature of tail gas.

Preferably, the reheating system further comprises a low temperature reheat steam desuperheater and a high temperature reheat steam desuperheater; the low temperature reheater front end is equipped with the reheat admission pipe, the high temperature reheater rear end is equipped with the reheat outflow pipe, low temperature reheat steam desuperheater installs on the reheat admission pipe, high temperature reheat steam desuperheater installs on the reheat outflow pipe. The utility model discloses a reheat steam two-stage desuperheating was adjusted around adopting, can quick effectual regulation reheat main steam temperature, prevents that the re-heater receives the hot side overtemperature.

Preferably, the heat recovery coke oven high-temperature ultrahigh-pressure reheating waste heat boiler further comprises a superheating system, wherein the superheating system comprises a low-temperature superheater, a medium-temperature superheater and a high-temperature superheater, and the high-temperature superheater is arranged between the protection evaporator and the high-temperature reheater; the medium-temperature superheater is arranged between the high-temperature reheater and the low-temperature reheater; the low-temperature superheater is arranged between the low-temperature reheater and the ultrahigh-temperature evaporator; the ultrahigh pressure section drum is externally connected with a low-temperature superheater through an outer flowing lower pipe, the outflow end of the low-temperature superheater is connected with a medium-temperature superheater through a first superheated flow pipe, the outflow end of the medium-temperature superheater is connected with a high-temperature superheater through a second superheated flow pipe, and the high-temperature superheater is externally connected with a superheated outflow pipe.

Preferably, the superheating system further comprises a low-temperature superheated steam desuperheater and a high-temperature superheated steam desuperheater, wherein the high-temperature superheated steam desuperheater is installed on the second superheated flow pipe, and the high-temperature superheated steam desuperheater is installed on the first superheated flow pipe.

Preferably, a middle flow pipe is further arranged between the overheating outlet pipe and the reheating inlet pipe, a temperature and pressure reducer is mounted on the middle flow pipe, and the joint of the middle flow pipe and the reheating inlet pipe is located at the rear end of the low-temperature reheating temperature reducer. The utility model discloses a well flow tube is located with the junction of reheat admission pipe low temperature reheat desuperheater rear end, it has improved the cooling effect of low temperature reheat desuperheater.

(III) advantageous effects

The utility model provides a pair of heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler, it has following advantage:

1. the utility model adopts a protection evaporator, an ultra-high pressure section evaporator and an ultra-high pressure section boiler barrel, wherein the boiler body at the rear end of the ultra-high pressure section evaporator is externally connected with the ultra-high pressure section boiler barrel through a first eduction tube and is matched with a downcomer to form a first circulation loop; the ultrahigh pressure section drum is also externally connected with a protection evaporator through a downcomer, and the protection evaporator pipe is communicated with the ultrahigh pressure section drum through a second eduction pipe to form a first circulation loop; and finally, the ultrahigh pressure section boiler barrel is externally connected with an ultrahigh pressure section evaporator through a downcomer, the ultrahigh pressure section evaporator is communicated with the ultrahigh pressure section boiler barrel through a third eduction tube to form a third circulation loop, and a front protection evaporator is arranged in a high-temperature flue gas area at the inlet of the boiler, so that the temperature of the inlet flue gas of high-temperature overheat is reduced, and the pipe wall of the high-temperature evaporator is protected from overtemperature. The layout increases the temperature and the air pressure of the tail gas, has high stability, and ensures the normal work of the system under the condition of improving the temperature and the pressure of steam in the ultrahigh-pressure section evaporation system. Through the working system, the tail gas temperature of the tail end of the ultra-high pressure section evaporation system is increased and stabilized at about 900 ℃, the tail gas pressure is 13.7Mpa, and meanwhile, because the waste gas of the existing coke oven contains a certain amount of corrosive gas (sulfur dioxide), the waste gas is easy to condense on the low-temperature heated surface at the tail part of the boiler, so that the corrosion damage of the pipe is caused, and therefore, the heat recovery coke oven waste heat boiler generally has the corrosion problem of a boiler economizer, and the safety and the stability of the operation of the boiler are influenced. The utility model discloses a tail gas temperature of the terminal work of superhigh pressure section vaporization system improves and stabilizes about 900 ℃, and the tail gas temperature of boiler afterbody is higher than the critical condensation temperature of corrosive gas (sulfur dioxide), so the low temperature of having avoided the boiler afterbody receives the hot side to condense, has reduced the pipe corrosion damage condition, has improved the security and the stability of boiler operation. The utility model discloses an ultrahigh pressure parameter to take steam reheat, compare the internal heat recovery coke oven middling pressure waste heat that generally adopts and improved the generating efficiency greatly, thereby the conversion rate of the energy that improves.

Drawings

FIG. 1 is a flow structure diagram of a high-temperature ultrahigh-pressure reheating waste heat boiler of a heat recovery coke oven of the utility model.

1. The system comprises a low-pressure section boiler barrel, a low-pressure section evaporator, a low-pressure section downcomer, a low-pressure section outlet pipe, a low-pressure section boiler barrel, a high-pressure section boiler barrel, a low-level economizer, a 7, a high-level economizer, a 8, a membrane water wall, a 9, a slag condenser, a 10, a protective evaporator, a 11, an ultra-high-pressure section evaporator, a 12, a downcomer, a 13, a boiler body, a 14, a low-temperature superheater, a 15, a medium-temperature superheater, a 16, a high-temperature superheater, a 17, a low-temperature superheated steam desuperheater, a 18, a high-temperature superheated steam desuperheater, a 19, a low-temperature reheater, a 20, a high-temperature reheater, a 21, a low-temperature reheater; 23. the system comprises a first outlet pipe, a first outlet pipe 24, a second outlet pipe 25, a third outlet pipe 26, a front channel 27, a rear channel 28, a front flue gas inlet 29, a flue gas conversion port 30, a flue gas outlet 33, an outer flow lower pipe 34, a middle flow through pipe 35, a temperature and pressure reduction device 36, a conversion pipe 37, a reheating inlet pipe 38, a reheating outlet pipe 39, a first superheating flow pipe 40, a second superheating flow pipe 100, a low-pressure evaporation system 200 and an ultrahigh-pressure section evaporation system.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically coupled, directly coupled, or indirectly coupled through an intermediary. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the utility model provides a heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler, include: low pressure vaporization system 100 and superhigh pressure section vaporization system 200, superhigh pressure section vaporization system includes the pot body 13, the pot body includes anterior passageway 26 and rear portion passageway 27, and wherein anterior passageway has the anterior flue gas inlet 28 that is located the bottom and the flue gas conversion mouth 29 that is located the top, the external rear portion passageway of flue gas conversion mouth, rear portion passageway bottom is equipped with exhanst gas outlet 30. The utility model discloses a boiler is two pressure systems, vertical pi type structure. The boiler adopts 2 heat exchange return strokes, membrane walls and a full natural circulation mode. The utility model discloses boiler superhigh pressure section soda system is still installed to superhigh pressure section vaporization system. The utility model discloses low pressure section vaporization system still installs boiler low pressure section soda system.

A protection evaporator 10 is arranged on one side in the pot body positioned at the front end in the smoke flowing direction, and an ultrahigh pressure section evaporator 11 is arranged on the other side in the pot body positioned at the rear end in the smoke flowing direction; the low-pressure evaporation system comprises a low-pressure section downcomer 3, a low-pressure section eduction tube 4, a low-pressure section boiler barrel 1 and a low-pressure section evaporator 2; and two ends of the low-pressure section downcomer are respectively communicated with the low-pressure section boiler barrel and the low-pressure section evaporator, and two ends of the low-pressure section eduction tube are respectively communicated with the low-pressure section boiler barrel and the low-pressure section evaporator to form a closed loop.

The boiler body positioned at the rear end of the ultrahigh-pressure section evaporator is externally connected with an ultrahigh-pressure section drum 5 through a first leading-out pipe 23, and the ultrahigh-pressure section drum is externally connected with a low-pressure evaporation system; the ultrahigh pressure section drum is also externally connected with a protection evaporator through a downcomer 12, and the protection evaporator is communicated with the ultrahigh pressure section drum through a second eduction tube 24; the ultrahigh pressure section drum is also externally connected with an ultrahigh pressure section evaporator through a downcomer, and the ultrahigh pressure section evaporator is communicated with the ultrahigh pressure section drum through a third eduction tube. And a membrane water-cooled wall 8 is arranged on the inner side wall of the pot body at the rear end of the ultrahigh pressure section evaporator.

The protective evaporator is arranged at the bottom end of the front channel; the ultrahigh pressure section evaporator is arranged at the upper part of the front passage, and the horizontal height of the top end of the ultrahigh pressure section evaporator is lower than the horizontal height of the bottom of the flue gas conversion port. The membrane water wall extends from the top of the front channel to the bottom of the front channel. And a slag condensing pipe 9 is arranged at the flue gas inlet, and the slag condensing pipe and the lower part of the membrane water-cooled wall at the bottom of the channel form a cooling chamber together.

An upper-level economizer 6 and a lower-level economizer 7 are arranged in the rear channel from top to bottom; the low-pressure section evaporator is arranged in a rear channel between the upper-level economizer and the lower-level economizer. The upper-level economizer adopts a finned tube to be arranged behind the ultrahigh-pressure section evaporator, and the lower-level economizer adopts a light pipe to be arranged at the low-pressure section evaporator. In the aspect of a steam-water system of a low-pressure section of a boiler, feed water directly enters a drum 1 of the low-pressure section, enters an inlet header of an evaporator of the low-pressure section through a downcomer 3 of the low-pressure section, absorbs heat through a heating surface of an evaporator 2 of the low-pressure section, and a generated steam-water mixture enters the drum of the low-pressure section through a leading-out pipe 4 of the low-pressure section, and is subjected to steam-water separation through an internal device of the drum, and saturated steam is led out for.

The high-temperature ultrahigh-pressure reheating waste heat boiler of the heat recovery coke oven also comprises a reheating system; the reheating system comprises a low-temperature reheater 19, a high-temperature reheater 20, a low-temperature reheated steam desuperheater 21 and a high-temperature reheated steam desuperheater 22; the low-temperature reheater is arranged between the protection evaporator and the ultrahigh-pressure section evaporator; the high-temperature reheater is arranged between the protective evaporator and the low-temperature reheater; the low temperature reheater is connected to the high temperature reheater via a transfer line 36. The low temperature reheater front end is equipped with reheat admission pipe 37, the high temperature reheater rear end is equipped with reheat outflow 38, low temperature reheat steam desuperheater installs on the reheat admission pipe, high temperature reheat steam desuperheater installs on the reheat outflow.

The heat recovery coke oven high-temperature ultrahigh-pressure reheating waste heat boiler also comprises a superheating system, wherein the superheating system comprises a low-temperature superheater 14, a medium-temperature superheater 15, a high-temperature superheater 16, a low-temperature superheated steam desuperheater 17 and a high-temperature superheated steam desuperheater 18, and the high-temperature superheater is arranged between the protection evaporator and the high-temperature reheater; the medium-temperature superheater is arranged between the high-temperature reheater and the low-temperature reheater; the low-temperature superheater is arranged between the low-temperature reheater and the ultrahigh-temperature evaporator; the ultrahigh pressure section drum is externally connected with a low-temperature superheater through an external outflow lower pipe 33, the outflow end of the low-temperature superheater is connected with a medium-temperature superheater through a first superheated flow pipe 39, the outflow end of the medium-temperature superheater is connected with a high-temperature superheater through a second superheated flow pipe 40, and the high-temperature superheater is externally connected with a superheated outflow pipe. The high-temperature superheated steam desuperheater is arranged on the second superheated flow pipe; the high temperature superheated steam desuperheater is mounted on the first superheated flow pipe. And a middle flow pipe 34 is further arranged between the overheating outlet pipe and the reheating inlet pipe, a temperature and pressure reducer 35 is mounted on the middle flow pipe, and the joint of the middle flow pipe and the reheating inlet pipe is positioned at the rear end of the low-temperature reheating temperature reducer.

In the aspect of a low-pressure section steam-water system of the boiler, feed water directly enters a low-pressure section boiler barrel 1, enters an inlet header of a low-pressure section evaporator through a low-pressure section downcomer, absorbs heat through a heating surface of the low-pressure section evaporator, and then a generated steam-water mixture enters the low-pressure section boiler barrel through a low-pressure section eduction tube, and after steam-water separation is carried out through an internal device of the boiler barrel, saturated steam is led out for deoxidization.

In the aspect of a steam-water system of an ultrahigh pressure section of a boiler, feed water subjected to chemical treatment and deoxidization firstly enters a lower-level economizer under the pressure feeding of a feed water pump, enters an upper-level economizer after being heated by the lower-level economizer, and then is introduced into a barrel of the ultrahigh pressure section through a connecting pipe. Part of hot water in the ultrahigh pressure section drum enters a water-cooling wall lower header through a downcomer, absorbs heat in a radiation cooling hearth and a convection heating surface which are formed by membrane water-cooling walls, exchanges heat in a natural circulation mode, and a generated steam-water mixture returns to the ultrahigh pressure section drum through an eduction tube. And a part of hot water in the boiler barrel enters a lower header of the protection evaporator and the ultrahigh pressure section evaporator through the downcomer, absorbs heat in the protection evaporator and the ultrahigh pressure section evaporator, exchanges heat in a natural circulation manner, and a generated steam-water mixture returns to the boiler barrel through the eduction tube. Steam in the drum is subjected to steam-water separation through the drum internal device, and saturated steam is introduced into the low-temperature superheater, the medium-temperature superheater and the high-temperature superheater and is heated to the required steam temperature. In order to meet the requirement of outlet steam temperature, a desuperheater is arranged between a low-temperature superheater and a medium-temperature superheater, the desuperheater is arranged between the medium-temperature superheater and a high-temperature superheater, and temperature is reduced by water spraying as a temperature adjusting means.

In the embodiment, the temperature of the flue gas, namely the temperature of the residual heat flue gas from the coke oven is about 1040 ℃, and the residual heat flue gas enters the boiler from the lower end through the flue gas channel. In the inlet section, after passing through a slag condenser pipe, the airflow turns to 90 ℃ and flows upwards, and then sequentially passes through a protection evaporator, a high-temperature superheater, a high-temperature reheater, a medium-temperature superheater, a low-temperature reheater, a low-temperature superheater and an ultrahigh-pressure section evaporator, and turns to 180 ℃ through a corner flue at the top, the direction of the flue gas turns to flow downwards, and the flue gas flows through an upper-level economizer, a low-pressure section evaporator and a lower-level economizer, then is discharged out of a boiler through a tail flue, and finally is introduced into a chimney through a draught fan.

The reheated steam is extracted from a high-pressure cylinder of the steam turbine to have the temperature of ~ 280 ℃, passes through two stages of reheaters, namely a low-temperature reheater and a high-temperature reheater, is superheated to 540 ℃ and then returns to the steam turbine, and the steam temperature is adjusted by spraying water through a desuperheater to reduce the temperature.

The above-mentioned embodiments are only used for explaining the present invention, wherein the structure, connection mode, etc. of each component can be changed, all the equivalent transformation and improvement performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims (10)

1. The utility model provides a heat recovery coke oven high temperature superhigh pressure reheat exhaust-heat boiler which characterized in that includes: the system comprises a low-pressure evaporation system and an ultrahigh-pressure section evaporation system, wherein the ultrahigh-pressure section evaporation system comprises a pot body, a protective evaporator is arranged on one side in the pot body positioned at the front end in the smoke flowing direction, and an ultrahigh-pressure section evaporator is arranged on the other side in the pot body positioned at the rear end in the smoke flowing direction;

the boiler body positioned at the rear end of the ultrahigh-pressure section evaporator is externally connected with an ultrahigh-pressure section drum through a first lead-out pipe, and the ultrahigh-pressure section drum is externally connected with a low-pressure evaporation system; the ultrahigh pressure section drum is also externally connected with a protection evaporator through a downcomer, and the protection evaporator pipe is communicated with the ultrahigh pressure section drum through a second eduction pipe; the ultrahigh pressure section drum is also externally connected with an ultrahigh pressure section evaporator through a downcomer, and the ultrahigh pressure section evaporator is communicated with the ultrahigh pressure section drum through a third eduction tube.

2. The heat recovery coke oven high-temperature ultrahigh-pressure reheating waste heat boiler as claimed in claim 1, wherein a membrane water-cooled wall is mounted on the inner side wall of the boiler body at the rear end of the ultrahigh-pressure section evaporator.

3. The heat recovery coke oven high temperature ultra high pressure reheat waste heat boiler of claim 1, wherein the low pressure evaporation system comprises a low pressure section downcomer, a low pressure section outlet, a low pressure section drum, and a low pressure section evaporator; and two ends of the low-pressure section downcomer are respectively communicated with the low-pressure section boiler barrel and the low-pressure section evaporator, and two ends of the low-pressure section eduction tube are respectively communicated with the low-pressure section boiler barrel and the low-pressure section evaporator to form a closed loop.

4. The heat recovery coke oven high temperature ultra high pressure reheat waste heat boiler of claim 3, wherein the boiler body comprises a front channel and a rear channel, wherein the front channel has a front flue gas inlet at the bottom and a flue gas conversion port at the top, the flue gas conversion port is externally connected with the rear channel, and a flue gas outlet is provided at the bottom end of the rear channel.

5. The heat recovery coke oven high temperature ultra high pressure reheat waste heat boiler of claim 4, wherein the protection evaporator is installed at the bottom end of the front channel; the ultrahigh pressure section evaporator is arranged at the upper part of the front passage, and the horizontal height of the top end of the ultrahigh pressure section evaporator is lower than the horizontal height of the bottom of the flue gas conversion port.

6. The heat recovery coke oven high temperature ultra high pressure reheat waste heat boiler of claim 2, wherein the membrane water wall extends from a top of the front channel to a bottom of the front channel; and a slag condensing pipe is arranged at the flue gas inlet, and the slag condensing pipe and the lower part of the membrane water-cooled wall at the bottom of the channel form a cooling chamber together.

7. The heat recovery coke oven high-temperature ultrahigh-pressure reheating waste heat boiler as claimed in claim 4, wherein an upper-level economizer and a lower-level economizer are arranged in the rear channel from top to bottom; the low-pressure section evaporator is arranged in a rear channel between the upper-level economizer and the lower-level economizer.

8. The heat recovery coke oven high-temperature ultrahigh-pressure reheating waste heat boiler as claimed in claim 7, wherein the upper-stage economizer adopts a finned tube arranged behind the ultrahigh-pressure section evaporator, and the lower-stage economizer adopts a light pipe arranged at the low-pressure section evaporator.

9. The heat recovery coke oven high-temperature ultra-high-pressure reheating waste heat boiler as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8, further comprising a reheating system; the reheating system comprises a low-temperature reheater and a high-temperature reheater; the low-temperature reheater is arranged between the protection evaporator and the ultrahigh-pressure section evaporator; the high-temperature reheater is arranged between the protective evaporator and the low-temperature reheater; the low-temperature reheater is communicated with the high-temperature reheater through a conversion pipe; the reheating system also comprises a low-temperature reheating steam desuperheater and a high-temperature reheating steam desuperheater; the low temperature reheater front end is equipped with the reheat admission pipe, the high temperature reheater rear end is equipped with the reheat outflow pipe, low temperature reheat steam desuperheater installs on the reheat admission pipe, high temperature reheat steam desuperheater installs on the reheat outflow pipe.

10. The heat recovery coke oven high-temperature ultrahigh-pressure reheating waste heat boiler of claim 9, further comprising a superheating system, wherein the superheating system comprises a low-temperature superheater, a medium-temperature superheater and a high-temperature superheater, and the high-temperature superheater is arranged between the protection evaporator and the high-temperature reheater; the medium-temperature superheater is arranged between the high-temperature reheater and the low-temperature reheater; the low-temperature superheater is arranged between the low-temperature reheater and the ultrahigh-temperature evaporator; the ultrahigh pressure section drum is externally connected with a low-temperature superheater through an outer lower flow pipe, the outflow end of the low-temperature superheater is connected with a medium-temperature superheater through a first superheating flow pipe, the outflow end of the medium-temperature superheater is connected with a high-temperature superheater through a second superheating flow pipe, and the high-temperature superheater is externally connected with a superheating outflow pipe; the superheating system also comprises a low-temperature superheated steam desuperheater and a high-temperature superheated steam desuperheater; the high-temperature superheated steam desuperheater is arranged on the second superheated flow pipe; the high-temperature superheated steam desuperheater is arranged on the first superheated flow pipe; and a middle flow pipe is also arranged between the overheating outlet pipe and the reheating inlet pipe, a temperature and pressure reducer is mounted on the middle flow pipe, and the joint of the middle flow pipe and the reheating inlet pipe is positioned at the rear end of the low-temperature reheating temperature reducer.

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