CN116592335A - Synthetic ammonia heat recovery device combining boiler feed water heater, waste heat boiler and steam superheater - Google Patents

Synthetic ammonia heat recovery device combining boiler feed water heater, waste heat boiler and steam superheater Download PDF

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Publication number
CN116592335A
CN116592335A CN202310505235.5A CN202310505235A CN116592335A CN 116592335 A CN116592335 A CN 116592335A CN 202310505235 A CN202310505235 A CN 202310505235A CN 116592335 A CN116592335 A CN 116592335A
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CN
China
Prior art keywords
cavity
shell
steam
water
boiler
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Withdrawn
Application number
CN202310505235.5A
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Chinese (zh)
Inventor
卢健
王雪林
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Nanjing Jutuo Chemical Technology Co ltd
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Nanjing Jutuo Chemical Technology Co ltd
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Priority to CN202310505235.5A priority Critical patent/CN116592335A/en
Publication of CN116592335A publication Critical patent/CN116592335A/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B15/00—Water-tube boilers of horizontal type, i.e. the water-tube sets being arranged horizontally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
    • F22G3/003—Superheater drain arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention discloses synthetic ammonia heat recovery equipment combining a boiler feed water heater, a waste heat boiler and a steam superheater, which comprises a first shell and a second shell, wherein the first shell surrounds a furnace chamber; the second shell consists of a left cylinder shell, a middle cylinder shell and a right cylinder shell which are connected in sequence; the middle cylinder shell is internally provided with a steam generation cavity communicated with the furnace chamber, the left cylinder shell is internally provided with a superheated steam cavity, the right cylinder shell is internally provided with a water supply heating cavity, the water supply heating cavity is communicated with the bottom of the furnace chamber through a water distribution pipe, and the top of the furnace chamber is communicated with the superheated steam cavity through a superheated steam pipe. The invention combines the boiler feed water heater, the waste heat boiler and the steam superheater into a whole; the heated boiler water supply pipeline is omitted, so that heat loss is reduced, and heat exchange efficiency is improved; meanwhile, the vibration problem of the boiler water supply pipeline is solved.

Description

Synthetic ammonia heat recovery device combining boiler feed water heater, waste heat boiler and steam superheater
Technical Field
The invention relates to the technical field of synthesis ammonia heat recovery, in particular to synthesis ammonia heat recovery equipment combining a boiler feed water heater, a waste heat boiler and a steam superheater.
Background
Synthesis ammonia production begins with the production of gas and is accompanied by a thermal process until ammonia is synthesized. The heat released in the production process of the synthetic ammonia is reasonably utilized and controlled, so that not only can the energy consumption in the production be saved and the production cost be reduced, but also the co conversion rate and the ammonia synthesis rate can be improved, the heat is utilized by waste heat, and the heat is controlled by chemical reaction.
The traditional method for recovering the reaction heat of the synthetic ammonia is to convert the high-temperature synthetic gas at the outlet of the synthetic tower into hot water or steam through a waste heat boiler, a heat exchanger, a water cooler and other devices in sequence so as to recycle the reaction heat energy. For example, a heat recovery device and a heat recovery process of a synthetic ammonia system are disclosed in Chinese patent CN 108844054A; the system comprises an ammonia synthesis tower, wherein a synthesis gas pipeline of the ammonia synthesis tower is connected with an inlet of a heat exchanger through a waste heat boiler tube side inlet, a first outlet of the waste heat boiler tube side and a tube side of a boiler water supply preheater, and a second outlet of the waste heat boiler tube side is connected with the inlet of the heat exchanger through a resistance balancing device; the shell side inlet of the boiler feed water preheater is connected with a desalted water pipeline, the shell side outlet of the boiler feed water preheater is connected with the water supplementing port of the steam drum, the air inlet and the water returning port of the steam drum are respectively connected with the waste heat boiler shell side, and the top of the steam drum is connected with a steam pipe network. The traditional synthetic ammonia reaction heat recovery method has low heat exchange efficiency and large heat loss.
Chinese patent CN110500904a discloses an integrated ammonia synthesis heat recovery device comprising a first tube train heat exchanger and a second tube train heat exchanger connected to each other, the first tube train heat exchanger having a superheated steam outlet and a return air inlet; the second tube-in-tube heat exchanger is divided into a steam generation section and a preheating section; the tube side of the second tube array heat exchanger is communicated with the tube side of the first tube array heat exchanger; the shell side of the second tube array heat exchanger is not communicated with the shell side of the first tube array heat exchanger; a steam drum communicated with the steam generation section is arranged above the second tube nest heat exchanger, and the steam drum is communicated with the shell side of the steam generation section of the second tube nest heat exchanger through a rising pipe and a falling pipe; the top of the steam drum is provided with a steam outlet which is communicated with the air return port of the first tube array heat exchanger. The technical defects of the patent are as follows: 1) The heat exchange tube array produces strong vibration after the water supply is heated and is vaporized, so that the safe use of the equipment is affected; 2) The high-temperature water has certain heat loss in the ascending pipe and the descending pipe, so that the heat recovery efficiency is reduced; 3) The low-density water and the high-density water flow in one cavity, and the heat transfer efficiency is low.
Disclosure of Invention
The invention provides synthesis ammonia heat recovery equipment combining a boiler feed water heater, a waste heat boiler and a steam superheater, which aims to solve the technical problems of the existing integrated ammonia synthesis heat recovery equipment.
The technical scheme adopted by the invention is as follows:
a synthetic ammonia heat recovery device of a boiler feedwater heater, waste heat boiler and steam superheater combination, comprising: the first shell surrounds the furnace chamber, the top of the furnace chamber is provided with a steam outlet, and a steam outlet pipe is connected in the steam outlet; the second shell is arranged at the middle lower part of the furnace chamber, and two ends of the second shell extend out of the first shell and are in sealing connection with the left end socket and the right end socket respectively; a left tube plate is arranged between the left end socket and the second shell, a right tube plate is arranged between the right end socket and the second shell, a left end socket cavity is formed between the left tube plate and the left end socket shell, and a right end socket cavity is formed between the right tube plate and the right end socket shell; a heat exchange tube array is arranged in the second shell, and two ends of the heat exchange tube array respectively pass through the left tube plate and the right tube plate in a sealing way and are communicated with the left end socket cavity and the right end socket cavity;
the second shell consists of a left cylinder shell, a middle cylinder shell and a right cylinder shell which are sequentially connected; the middle cylinder shell is fixed in the furnace chamber through the fixed plate assembly, two ends of the middle cylinder shell are respectively in non-contact connection with the left cylinder shell and the right cylinder shell, the top of the middle cylinder shell is provided with a water outlet, the bottom of the middle cylinder shell is provided with a water inlet, and the water outlet and the water inlet are both communicated with the furnace chamber; an isolation tube plate A is arranged between the left cylindrical shell and the middle cylindrical shell, a superheated steam cavity is formed between the left tube plate and the middle cylindrical shell and between the left tube plate and the isolation tube plate A, a superheated steam outlet is arranged at one side of the top of the superheated steam cavity, which is close to the left tube plate, and a superheated steam inlet is arranged at one side, which is close to the isolation tube plate A, and is communicated with a steam outlet pipe through a superheated steam pipe; a water supply heating cylinder is sleeved in the right cylinder shell, one end of the water supply heating cylinder, which is away from the right tube plate, is closed by an isolation tube plate B, one end, close to the right tube plate, of the water supply heating cylinder is opened, the opened end is connected with the right cylinder shell through an annular sealing plate, a water supply heating cavity is formed between the water supply heating cylinder and the right tube plate, a boiler water supply inlet is formed at one side, close to the right tube plate, of the bottom of the water supply heating cavity, a boiler water supply outlet is formed at one side, close to the isolation tube plate B, of the water supply heating cylinder, the boiler water supply outlet is communicated with a furnace chamber through a water distribution pipe, the water distribution pipe is arranged below the middle cylinder shell, and a plurality of water distribution holes communicated with the furnace chamber are formed in the water distribution pipe;
the lower end of the synthetic gas outlet pipe passes through the left end socket shell in a sealing way and is communicated with the inner cavity of the heat exchange tube array through the high-temperature gas diversion component, and the right end socket cavity is provided with a heat exchange reaction gas outlet;
the synthetic gas at 440-450 ℃ from the synthesizing tower enters a high-temperature gas diversion assembly through a synthetic gas outlet pipe, is distributed into a heat exchange tube nest through the high-temperature gas diversion assembly, and enters a right seal head cavity after the tube pass of the heat exchange tube nest is reduced to 160-260 ℃ and is discharged from a heat exchange reaction gas outlet;
the boiler water supply at 104-210 ℃ and 5.0-5.5 MPa enters a water supply heating cavity through a boiler water supply inlet, is heated by a heat exchange tube array and is discharged into a water distribution tube from a boiler water supply outlet, is uniformly distributed to the bottom of a furnace chamber through a water distribution hole, then enters a middle cylinder shell from a water inlet at the bottom, low-density saturated water entering the middle cylinder shell flows upwards through the heat exchange tube array and is heated again to form a steam-water mixture, and the steam-water mixture flows out from a water outlet at the top of the middle cylinder shell and enters the furnace chamber to realize steam-water separation;
saturated steam with the temperature of 200-250 ℃ and the pressure of 4.0-4.5 MPa after the primary separation is up is discharged from a steam outlet pipe and enters a superheated steam cavity through a hot steam pipe; saturated steam in the superheated steam cavity is heated by the heat exchange tube array again to form superheated steam with the temperature of 400-450 ℃ and the pressure of 4.0-4.5 MPa, and finally the superheated steam is discharged from a superheated steam outlet.
Further, an arc-shaped baffle cover is arranged in the furnace chamber and is arranged above the middle cylinder shell, the furnace chamber is divided into an upper cavity and a lower cavity, the upper cavity is communicated with the steam outlet pipe, and the lower cavity is communicated with the upper cavity through channels around the arc-shaped baffle cover.
Further, the middle cylinder shell is positioned at the middle lower part of the furnace chamber, the water outlet at the top of the middle cylinder shell is connected with an overflow cover, the top of the overflow cover is open, the open end is contracted inwards to form a steam-water mixture overflow shrinkage cavity, and the steam-water mixture overflow shrinkage cavity is positioned at the upper part of the furnace chamber and the top surface of the steam-water mixture overflow shrinkage cavity is lower than the bottom surface of the arc-shaped baffle cover.
Further, an upper liquid level meter and a lower liquid level meter are arranged in the furnace shell, the upper liquid level meter is arranged between the top surface of the steam-water mixture overflow shrinkage cavity and the bottom surface of the arc-shaped baffle cover, the lower liquid level meter is arranged between the top surface of the steam-water mixture overflow shrinkage cavity and the top surface of the fixed plate assembly, and the surface continuous drain pipe is arranged between the upper liquid level meter and the lower liquid level meter.
Further, a plurality of blow-down pipes are arranged at the bottom of the furnace shell.
Further, an upper separating cylinder is arranged on the steam outlet pipe, a silk screen foam remover is arranged in the upper separating cylinder, the inner cavity of the separating cylinder is divided into an upper separating cavity and a lower separating cavity by the silk screen foam remover, the lower separating cavity is communicated with the steam outlet pipe, and the upper separating cavity is communicated with the superheated steam pipe.
Further, the fixed plate assembly has a plurality of groups, and every fixed plate assembly of group all includes left backup pad and the right backup pad that the symmetry set up, has all offered a plurality of drain hole in left backup pad and the right backup pad.
Further, two water distribution pipes are symmetrically arranged on the left support plate and the right support plate.
Further, the high-temperature air guide assembly comprises a guide cylinder and a conical guide sleeve, wherein the guide cylinder is axially arranged in the cavity of the left end socket, one end of the guide cylinder is sealed through an end cover, the other end of the guide cylinder is in sealing connection with the conical guide sleeve, the conical guide sleeve is arranged on the left tube plate and forms a second air cavity with the left tube plate, a cavity surrounded by the guide cylinder is a first air cavity, the second air cavity is communicated with the first air cavity and the inner cavity of the heat exchange tube array, the upper side surface of the guide cylinder is radially connected with an air inlet nipple, and the air inlet nipple is connected with a synthetic gas outlet pipe through an expansion joint.
Further, the left end socket, the high-temperature air guide assembly and the left tube plate are all made of ALLOY690 materials, and the inner side wall of the cavity of the left end socket is overlaid with an Inconel690 ALLOY layer resistant to hydrogen corrosion.
The invention has the beneficial effects that:
1. the boiler feed water heater, the waste heat boiler and the steam superheater are combined into a whole; the heated boiler water supply pipeline is omitted, the loss of heat in the pipeline is reduced, and the heat exchange efficiency is improved; meanwhile, the vibration problem of the boiler water supply pipeline caused by vaporization is solved.
2. The high-temperature part of the feed water heater of the boiler is provided with a high-temperature cavity (namely a left end socket cavity) and a high-temperature gas channel (namely a high-temperature gas diversion component) for protection, and the head of the high-temperature heat exchange column tube is provided with a hydrogen corrosion resistant material for protection; by adopting the protection measures, the corrosion resistance of the equipment can be effectively improved, and the service life of the equipment can be prolonged.
3. The outlet water of the water supply section of the boiler feed water heater is distributed by a water distribution pipe, so that the vibration of the heat exchange tube array can be effectively prevented.
4. The boiler feed water heater is internally provided with different cavities of low-density water and high-density water, so that saturated water flows in multiple cycles in the shell pass, and the heat transfer efficiency is improved.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus for recovering heat of synthesis ammonia according to the present invention.
Fig. 2 is a view from A-A in fig. 1.
Fig. 3 is an enlarged view of a portion of the left head of fig. 1.
FIG. 4 is a schematic flow diagram of a synthetic ammonia heat recovery device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings and a preferred embodiment.
Referring to fig. 1 to 4, a combined synthesis ammonia heat recovery device of a boiler feedwater heater, a waste heat boiler and a steam superheater includes a first housing 110 and a second housing 210.
The first housing 110 includes a cylindrical furnace shell extending in the X-axis direction, both ends of the cylindrical furnace shell are closed by elliptical heads, and the cylindrical furnace shell and the left and right elliptical heads are enclosed to form a furnace chamber 101. The first housing 110 is supported on the ground by a cradle a151, and a steam outlet pipe 113 communicating with the cavity 101 is provided at the top of the housing.
The steam outlet pipe 113 is connected with an upper separating cylinder 115 through a flange, a cylindrical cavity closed by an elliptical head is arranged in the upper separating cylinder, the inner diameter of the cylindrical cavity is 1.5-2 times that of the steam outlet pipe 113, a wire mesh foam remover 116 is arranged in the cylindrical cavity, the wire mesh foam remover 116 divides the cylindrical cavity into an upper separating cavity 103 and a lower separating cavity 102, the lower separating cavity 102 is communicated with the steam outlet pipe 113, and a saturated steam outlet is arranged at the top of the upper separating cavity 103. The saturated steam discharged from the steam outlet pipe 113 enters the upper separating cylinder 115 with the increased inner diameter, the flow speed is reduced, and liquid drops carried in the steam are trapped in the wire mesh demister 116, so that the separation of saturated water and saturated steam is further realized, and the steam quality is improved.
Referring to fig. 2, an arc-shaped baffle cover 114 is arranged in the furnace chamber 101, the arc-shaped baffle cover 114 is supported at the top of the furnace chamber 101 through a supporting plate, the circular axis of the arc-shaped baffle cover 114 coincides with the axis of the furnace chamber 101, the arc-shaped baffle cover 114 is covered above a middle cylinder shell 212, the upper part of the furnace chamber 101 is provided with an upper cavity 1011 and a lower cavity 1012, the upper cavity 1011 is communicated with a steam outlet pipe 113, and the lower cavity 1012 is communicated with the upper cavity 1011 through a steam channel between the supporting plates. The arc-shaped baffle cover 114 is arranged, so that separated saturated steam is not directly discharged from the steam outlet pipe 113, small liquid drops carried in the steam are impacted on the arc-shaped baffle cover 114 to be separated from the steam, and the separated steam bypasses the arc-shaped baffle cover 114 and is discharged into the upper separation cylinder 115 from the steam outlet pipe 113.
The bottom of the cavity 101 is provided with a plurality of blow-down ports, and a blow-down pipe 120 is installed in the blow-down ports for discharging impurities.
The second casing 210 is disposed in the first casing 110 and is located at the middle lower portion of the cavity 101, and two ends of the second casing extend out of the first casing 110 and are connected with the left sealing head 230 and the right sealing head 240 in a sealing manner; the left seal head 230 is supported on the movable support B152, the right seal head 240 is supported on the movable support C153, and the movable support B152, the movable support C153 and the movable support A151 are supported on the same plane.
A left tube plate 250 is arranged between the left end socket 230 and the second shell 210, a right tube plate 260 is arranged between the right end socket 240 and the second shell 210, a left end socket cavity 231 is formed between the left tube plate 250 and the left end socket shell, and a right end socket cavity 241 is formed between the right tube plate 260 and the right end socket shell; the second housing 210 is provided with a heat exchange tube array 220, and two ends of the heat exchange tube array 220 respectively pass through the left tube plate 250 and the right tube plate 260 in a sealing way and are communicated with the left end socket cavity 231 and the right end socket cavity 240.
The second housing 210 is composed of a left cylindrical housing 211, a middle cylindrical housing 212, and a right cylindrical housing 213 which are axially connected in this order.
The middle cylinder housing 212 is supported in the cavity 101 by a fixing plate assembly 2121, and both ends thereof are coupled to the left cylinder housing 211 and the right cylinder housing 213 without contact. The middle cylinder housing 212 includes a left side housing and a right side housing, and the top and bottom of the left side housing and the right side housing are not connected, thereby forming a water outlet and a water inlet, respectively, where the overflow cover 214 is connected. The overflow hood 214 is rectangular in shape with an open top and the open end is inwardly contracted to form a vapor-water mixture overflow constriction, the vapor-water mixture overflow constriction top surface being higher than the top surface of the fixed plate assembly 2121 and lower than the bottom surface of the arcuate baffle hood 114. The arrangement of the steam-water mixture overflow shrinkage mouth can enable the flow speed of the steam-water mixture which overflows the shrinkage mouth to be increased, and the steam-water mixture which flows rapidly can be rapidly separated after entering the furnace chamber 101 with suddenly increased volume.
The plate assembly 2121 has a plurality of sets uniformly distributed along the X-axis. Each set of fixed plate assemblies 2121 comprises a left support plate 21211 and a right support plate 21212 which are symmetrically arranged, wherein the left support plate 21211 and the right support plate 21212 are saddle-shaped, the plate surfaces of the left support plate 21211 are vertical to the heat exchange tube array 220, the inner circumferential surface of the left support plate 21211 is radially fixed on the left side shell of the middle cylindrical shell 212, and the outer circumferential side surface of the left support plate is slidably connected with the inner wall of the cylindrical furnace shell 110; the inner circumferential side surface of the right support plate 21212 is radially fixed on the right side shell of the middle cylinder shell 212, the outer circumferential side surface of the right support plate 21212 is slidably connected with the inner wall of the cylindrical furnace shell 110, and a plurality of liquid guide holes 21213 are formed in each of the left support plate 21211 and the right support plate 21212. The fixing plate assembly 2121 plays a role in supporting the middle cylindrical shell 212 and simultaneously disturbing the flow of the high-density saturated water, so that the high-density saturated water after steam separation is fully mixed with the boiler feed water entering from the boiler feed water outlet 273, and the heat exchange effect is improved.
An upper liquid level meter 117, a lower liquid level meter 118 and a surface continuous blow-down pipe 119 are radially arranged on the side wall of the first shell 110, an installation opening of the upper liquid level meter 117 is positioned between the top surface of the steam-water mixture overflow shrinkage mouth and the bottom surface of the arc-shaped baffle cover 114, an installation opening of the lower liquid level meter 118 is positioned between the top surface of the steam-water mixture overflow shrinkage mouth and the top surface of the fixed plate assembly 2121, the surface continuous blow-down pipe 119 is arranged between the upper liquid level meter 117 and the lower liquid level meter 118, the upper liquid level meter 117 and the lower liquid level meter 118 are arranged on the same side for convenient installation and observation, and the surface continuous blow-down pipe 119 is arranged on the other side. The upper liquid level gauge 117 and the lower liquid level gauge 118 are arranged, so that the highest water level and the lowest water level of saturated water of the boiler in the running process can be monitored in real time, dry burning is prevented, or the water level is too high, and the steam-water separation effect is reduced. The surface continuous drain 119 can be used to drain impurities floating on the surface of saturated water to improve steam quality.
One end of the left cylinder shell 211 is axially connected with the middle cylinder shell 212 in a non-contact way, namely an expansion joint is arranged between the left cylinder shell 211 and the middle cylinder shell 212, and the other end of the left cylinder shell 211 extends out of the furnace shell 110 to be connected with the left sealing head 230. An isolation tube plate A270 is arranged between the left cylinder shell 211 and the middle cylinder shell 212, a superheated steam cavity 201 is formed between the left tube plate 250 and the middle cylinder shell 212 and between the left tube plate 250 and the isolation tube plate A270, a superheated steam outlet 2011 is arranged at one side of the top of the superheated steam cavity 201 close to the left tube plate 250, a superheated steam inlet 2012 is arranged at one side of the top of the isolation tube plate A270, and the superheated steam inlet 2012 is communicated with a saturated steam outlet at the top of the upper separation cavity 103 through a superheated steam pipe 112. The left cylindrical shell 211 and the heat exchange tube array positioned in the left cylindrical shell 211 form a steam superheater, saturated steam discharged from the upper separation cavity 103 enters the superheated steam cavity 201 through the hot steam tube 112 and is heated by the high-temperature synthetic gas again to form superheated steam, and the superheated steam is discharged from the superheated steam outlet 2011. A drain is provided at the bottom of the left cylindrical housing 211, and a drain pipe is connected to the drain for discharging impurities in the superheated steam chamber 201.
One end of the right cylinder shell 213 is in axial non-contact connection with the middle cylinder shell 212, namely an expansion joint is arranged between the right cylinder shell 213 and the middle cylinder shell 212, and the other end of the right cylinder shell 213 extends out of the furnace shell 110 to be connected with the right seal head 240. The water supply heating cylinder 2131 is axially and sealed in the right cylinder shell 213, one end of the water supply heating cylinder 2131 is open, one end of the water supply heating cylinder 2131 is closed by the isolating tube plate B271, the open end is close to the right tube plate 260 and is in sealing connection with the right tube plate 260 through an annular sealing plate, a water supply heating cavity 202 is formed between the water supply heating cylinder 2131 and the right tube plate 260, and single arched baffle plates 281 are alternately arranged in the water supply heating cavity 202. The bottom of the water supply heating cavity 202, which is close to one end of the right tube plate 260, is provided with a boiler water supply inlet 2021, as shown in fig. 1, the boiler water supply inlet 2021 is positioned between the rightmost single arched baffle plate and the right tube plate 260, the other end of the bottom of the water supply heating cavity 202 is provided with a boiler water supply outlet 2022, as shown in fig. 1, the boiler water supply outlet 2022 is positioned between the leftmost single arched baffle plate and the isolation tube plate B271, the boiler water supply outlet 2022 is connected with a water distribution pipe 290, the water distribution pipe 290 axially extends along the bottom of the furnace cavity 101 and is penetratingly arranged at the lower end of the fixed plate assembly 2021, and a plurality of water distribution holes are formed in the water distribution pipe 290. In this embodiment, two water distribution pipes 290 are provided and symmetrically distributed. The single arched baffle 281 supports the heat exchange tube array on one hand and plays a role in disturbing boiler water supply and improving heat exchange effect on the other hand. The heated boiler feed water is uniformly distributed at the bottom of the furnace chamber 101 through the water distribution pipe 290, enters the middle cylinder shell 212 after being mixed with the high-density saturated water after steam distribution, and is heated and vaporized by the heat exchange tube array 220 again, so that the impact on the heat exchange tube array 220 can be effectively reduced, and the vibration of the heat exchange tube array 220 is reduced.
The high-temperature air guide assembly 400 is arranged in the left end socket cavity 231, the high-temperature air guide assembly 400 comprises a guide cylinder 410 and a conical guide sleeve 420, the guide cylinder 410 is axially arranged in the left end socket cavity 231, one end of the guide cylinder 410 is sealed through an end cover, the other end of the guide cylinder is in sealing connection with the conical guide sleeve 420, the conical guide sleeve 420 is covered on the left tube plate 250 and forms a second air cavity 302 with the left tube plate 250, a cavity surrounded by the guide cylinder 410 is a first air cavity 301, the second air cavity 302 is communicated with the first air cavity 301 and the inner cavity of the heat exchange tube array 220, and the upper side surface of the guide cylinder 410 is radially connected with an air inlet nipple.
The synthesis gas outlet pipe 300 comprises a pipe body 310 and a pipe flange 320, wherein the pipe body 310 is in sealing connection with the left end socket 230 through the pipe flange 320, the pipe body 310 stretches into the left end socket cavity 231, and is connected with an air inlet nipple of the guide cylinder 410 through an expansion joint.
The left end socket cavity 231 is provided with a high-temperature cavity temperature measuring port 232, the circular diversion cavity of the diversion cylinder 410 is provided with a waste pot inlet gas temperature measuring port 402, and the conical diversion cavity of the conical diversion cover 420 is provided with a waste pot inlet gas pressure measuring port 401. The left end socket 230, the high-temperature air guide assembly 400 and the left tube plate 250 are all made of ALLOY690 materials with good high-temperature resistance, and the inner side wall of the left end socket cavity 231 is overlaid with an Inconel690 ALLOY layer with hydrogen corrosion resistance. By providing the high temperature gas diversion assembly 400 and the hydrogen corrosion resistant alloy layer, the corrosion resistance of the equipment can be effectively improved, the service life of the equipment can be prolonged, and the manufacturing cost of the equipment can be reduced.
The right end enclosure cavity 241 is provided with a heat exchange reaction gas outlet 403.
Referring to fig. 4, the working principle of the device is as follows:
the synthetic gas at 440-450 ℃ from the synthetic tower enters the guide cylinder 410 through the synthetic gas outlet pipe 310, is distributed into the heat exchange tube array 220 through the conical guide cylinder 420, flows through the tube pass of the heat exchange tube array 220 to be reduced to 160-260 ℃ and then enters the right seal head cavity 241, and is discharged from the heat exchange reaction gas outlet 403;
104-210 ℃ and 5.0-5.5 MPa boiler feed water enters the feed water heating cavity 202 through the boiler feed water inlet 2021, flows through the feed water heating cavity 202 in the axial direction, is heated by the heat exchange tube array 220 and is discharged into the water distribution tube 290 from the boiler feed water outlet 2022, the heated boiler feed water in the water distribution tube 290 is uniformly distributed to the bottom of the furnace chamber 101 through the water distribution holes, then enters the middle cylinder shell 212 from the water inlet at the bottom of the middle cylinder shell 212, low-density saturated water entering the middle cylinder shell 212 flows upwards in the radial direction and flows through the heat exchange tube array 220 to be heated again to form a steam-water mixture, the steam-water mixture overflows from the steam-water mixture overflow shrinkage mouth at the top of the overflow cover 214 and flows into the upper part of the furnace chamber 101 to realize steam-water separation;
the steam with 200-250 ℃ and 4.0-4.5 MPa of saturated water after preliminary separation rises into a lower cavity 1012 at the top of the furnace chamber, then enters an upper cavity 1011 from the periphery of an arc-shaped baffle cover 114, finally enters an upper separating cylinder 115 from a steam outlet pipe 113, removes water mist through a wire mesh demister 116, and enters a superheated steam cavity 201 through a hot steam pipe 112; the high-density saturated water after steam separation flows downwards in the furnace chamber 101 and is mixed with the boiler feed water entering from the boiler feed water outlet 2022, and the circulating flow improves the heat exchange efficiency;
saturated steam in the superheated steam cavity 201 is heated again by the heat exchange tube array 220 to form superheated steam with the temperature of 400-450 ℃ and the pressure of 4.0-4.5 MPa, and finally the superheated steam is discharged from the superheated steam outlet 2011.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and remain within the scope of the invention.

Claims (10)

1. A synthetic ammonia heat recovery apparatus of a combination of a boiler feedwater heater, a waste heat boiler and a steam superheater, comprising: the first shell (110) and the second shell (210) are eccentrically arranged, the first shell surrounds the furnace chamber (101), a steam outlet is arranged at the top of the furnace chamber (101), and a steam outlet pipe (113) is connected in the steam outlet;
the second shell (210) is arranged at the middle lower part of the furnace chamber (101), and two ends of the second shell extend out of the first shell (110) respectively and are connected with the left seal head (230) and the right seal head (240) in a sealing manner; a left tube plate (250) is arranged between the left end socket (230) and the second shell (210), a right tube plate (260) is arranged between the right end socket (240) and the second shell (210), a left end socket cavity (231) is formed between the left tube plate (250) and the left end socket shell, and a right end socket cavity (241) is formed between the right tube plate (260) and the right end socket shell; a heat exchange tube (220) is arranged in the second shell (210), and two ends of the heat exchange tube (220) respectively pass through the left tube plate (250) and the right tube plate (260) in a sealing way and are communicated with the left end socket cavity (231) and the right end socket cavity (241);
the second shell (210) consists of a left cylinder shell (211), a middle cylinder shell (212) and a right cylinder shell (213) which are sequentially connected;
the middle cylinder shell (212) is fixed in the furnace chamber (101) through a fixed plate assembly (2121), two ends of the middle cylinder shell are respectively in non-contact connection with the left cylinder shell (211) and the right cylinder shell (213), a water outlet is formed in the top of the middle cylinder shell (212), a water inlet is formed in the bottom of the middle cylinder shell, and the water outlet and the water inlet are both communicated with the furnace chamber (101);
an isolation tube plate A (270) is arranged between the left cylinder shell (211) and the middle cylinder shell (212), a superheated steam cavity (201) is formed between the left tube plate (250) and the middle cylinder shell (212) and between the left tube plate and the isolation tube plate A (270), a superheated steam outlet (2011) is arranged at one side, close to the left tube plate (250), of the top of the superheated steam cavity (201), a superheated steam inlet (2012) is arranged at one side, close to the isolation tube plate A (270), of the superheated steam cavity, and the superheated steam inlet (2012) is communicated with the steam outlet tube (113) through a superheated steam tube (112);
a water supply heating cylinder (2131) is sleeved in the right cylinder shell (213), one end of the water supply heating cylinder (2131) deviating from the right tube plate (260) is closed by an isolation tube plate B (271), one end close to the right tube plate (260) is open, the open end is connected with the right cylinder shell (213) through an annular sealing plate, a water supply heating cavity (202) is formed between the water supply heating cylinder (2131) and the right tube plate (260), a boiler water supply inlet (2021) is formed in the bottom of the water supply heating cavity (202) and close to the right tube plate (260), a boiler water supply outlet (2022) is formed in the side close to the isolation tube plate B (271), the boiler water supply outlet (2022) is communicated with the furnace chamber (101) through a water distribution pipe (290), the water distribution pipe (290) is arranged below the middle cylinder shell (212), and a plurality of water distribution holes communicated with the furnace chamber (101) are formed in the water distribution pipe (290);
a high-temperature air guide assembly (400) is arranged in the left end socket cavity (231), the lower end of the synthetic gas outlet pipe (300) passes through the left end socket shell in a sealing way and is communicated with the inner cavity of the heat exchange tube array (220) through the high-temperature air guide assembly (400), and the right end socket cavity (241) is provided with a heat exchange reaction gas outlet (403);
the synthetic gas at 440-450 ℃ from the synthesis tower enters a high-temperature gas diversion assembly (400) through a synthetic gas outlet pipe (300), is distributed into a heat exchange tube array (220) through the high-temperature gas diversion assembly, enters a right seal head cavity (241) after the tube pass of the heat exchange tube array is reduced to 160-260 ℃, and is discharged from a heat exchange reaction gas outlet (403);
104-210 ℃ and 5.0-5.5 MPa boiler feed water enters a feed water heating cavity (202) through a boiler feed water inlet (2021), is heated by a heat exchange tube array (220), is discharged into a water distribution tube (290) from a boiler feed water outlet (2022), is uniformly distributed to the bottom of a furnace chamber (101) through water distribution holes, then enters a middle cylinder shell (212) from a water inlet at the bottom, low-density saturated water entering the middle cylinder shell (212) flows upwards through the heat exchange tube array (220) and is heated again to form a steam-water mixture, and the steam-water mixture flows out from a water outlet at the top of the middle cylinder shell (212) and enters the furnace chamber (101) to realize steam-water separation;
saturated steam with the temperature of 200-250 ℃ and the pressure of 4.0-4.5 MPa after the primary separation is up is discharged from a steam outlet pipe (113) and enters a superheated steam cavity (201) through a hot steam pipe (112); saturated steam in the superheated steam cavity is heated by the heat exchange tube array (220) again to form superheated steam with the temperature of 400-450 ℃ and the pressure of 4.0-4.5 MPa, and finally the superheated steam is discharged from the superheated steam outlet (2011).
2. The synthetic ammonia heat recovery apparatus according to claim 1, wherein an arc-shaped baffle cover (114) is arranged in the furnace chamber (101), the arc-shaped baffle cover (114) is covered above the middle cylinder shell (212) to divide the furnace chamber (101) into an upper cavity (1011) and a lower cavity (1012), the upper cavity (1011) is communicated with the steam outlet pipe (113), and the lower cavity (1012) is communicated with the upper cavity (1011) through channels around the arc-shaped baffle cover (114).
3. The ammonia synthesis heat recovery device according to claim 1, wherein the middle cylindrical shell (212) is located at the middle lower part of the furnace chamber (101), the water outlet at the top of the middle cylindrical shell (212) is connected with an overflow cover (214), the top of the overflow cover (214) is open, the open end is contracted inwards to form a steam-water mixture overflow shrinkage mouth, the steam-water mixture overflow shrinkage mouth is located at the upper part of the furnace chamber (101) and the top surface of the steam-water mixture overflow shrinkage mouth is lower than the bottom surface of the arc-shaped baffle cover (114).
4. A synthetic ammonia heat recovery device according to claim 3, characterized in that an upper liquid level meter (117), a lower liquid level meter (118) and a surface continuous blow-down pipe (119) are arranged in the furnace shell (110), the upper liquid level meter (117) is arranged between the top surface of the steam-water mixture overflow shrinkage mouth and the bottom surface of the arc-shaped baffle cover (114), the lower liquid level meter (118) is arranged between the top surface of the steam-water mixture overflow shrinkage mouth and the top surface of the fixed plate assembly (2121), and the surface continuous blow-down pipe (119) is arranged between the upper liquid level meter (117) and the lower liquid level meter (118).
5. The synthetic ammonia heat recovery device according to claim 4, characterized in that the bottom of the furnace shell (110) is provided with several blow down pipes (120).
6. The synthetic ammonia heat recovery device according to claim 1, characterized in that an upper separation cylinder (115) is mounted on the steam outlet pipe (113), a wire mesh demister (116) is mounted in the upper separation cylinder (115), the wire mesh demister (116) divides the inner cavity of the separation cylinder into an upper separation chamber (103) and a lower separation chamber (102), the lower separation chamber (102) is communicated with the steam outlet pipe (113), and the upper separation chamber (103) is communicated with the superheated steam pipe (112).
7. The ammonia synthesis gas heat recovery device according to claim 1, wherein the fixed plate assembly (2121) comprises a plurality of groups, each group of fixed plate assembly comprises a left support plate (21211) and a right support plate (21212) which are symmetrically arranged, and a plurality of liquid guide holes (21213) are formed in each of the left support plate (21211) and the right support plate (21212).
8. The ammonia synthesis gas heat recovery device according to claim 7, wherein two water distribution pipes (290) are symmetrically arranged on the left support plate (21211) and the right support plate (21212).
9. The synthetic ammonia heat recovery device according to claim 1, wherein the high-temperature air guide assembly (400) comprises a guide cylinder (410) and a conical guide sleeve (420), the guide cylinder (410) is axially arranged in the left end socket cavity (231), one end of the guide cylinder is sealed through an end cover, the other end of the guide cylinder is in sealing connection with the conical guide sleeve (420), the conical guide sleeve (420) is covered on the left tube plate (250) and forms a second air cavity (302) with the left tube plate (250), a cavity surrounded by the guide cylinder (410) is a first air cavity (301), the second air cavity (302) is communicated with the first air cavity (301) and the inner cavity of the heat exchange tube array (220), and an air inlet nipple is radially connected to the upper side surface of the guide cylinder (410) and is connected with the synthetic gas outlet tube (310) through an expansion joint.
10. The ammonia synthesis gas heat recovery device according to claim 1, wherein the left end enclosure (230), the high-temperature air guide assembly (400) and the left tube plate (250) are all made of ALLOY690 materials, and an inner side wall of the cavity (231) of the left end enclosure is overlaid with an Inconel690 ALLOY layer resistant to hydrogen corrosion.
CN202310505235.5A 2023-05-06 2023-05-06 Synthetic ammonia heat recovery device combining boiler feed water heater, waste heat boiler and steam superheater Withdrawn CN116592335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310505235.5A CN116592335A (en) 2023-05-06 2023-05-06 Synthetic ammonia heat recovery device combining boiler feed water heater, waste heat boiler and steam superheater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310505235.5A CN116592335A (en) 2023-05-06 2023-05-06 Synthetic ammonia heat recovery device combining boiler feed water heater, waste heat boiler and steam superheater

Publications (1)

Publication Number Publication Date
CN116592335A true CN116592335A (en) 2023-08-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310505235.5A Withdrawn CN116592335A (en) 2023-05-06 2023-05-06 Synthetic ammonia heat recovery device combining boiler feed water heater, waste heat boiler and steam superheater

Country Status (1)

Country Link
CN (1) CN116592335A (en)

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Application publication date: 20230815