CN215963489U - Water-cooling and air-cooling combined isothermal shift reactor - Google Patents

Abstract

The utility model provides a water-cooling and air-cooling combined isothermal shift reactor, which comprises a pressure-bearing shell, a raw material gas inlet, a shift gas outlet, a central pipe, a gas-cooling tube bundle support, a gas-cooling tube bundle, a catalyst inner grid, a water-cooling tube bundle, a boiler water inlet, a boiler water outlet and a catalyst outer grid, wherein the gas-cooling tube bundle and the water-cooling tube bundle are arranged in a catalyst bed layer between the catalyst outer grid and the catalyst inner grid, the lower end of the gas-cooling tube bundle is communicated with the raw material gas inlet, and shift gas sequentially passes through the water-cooling tube bundle and the gas-cooling tube bundle and flows out from the central pipe. The reaction temperature can be controlled in a lower range, and the flow requirements can be met by a single reactor.

Description

Water-cooling and air-cooling combined isothermal shift reactor

Technical Field

The utility model belongs to the field of chemical equipment, and particularly relates to a water-cooling and air-cooling combined isothermal shift reactor.

Background

The shift reaction is a strongly exothermic reaction, while the low temperature favors the equilibrium of the reaction moving forward, and in order to make the reaction more complete, a large amount of heat generated by the reaction must be removed, otherwise the reaction temperature will rise sharply. High temperatures not only inhibit the reaction from proceeding, but also can cause severe damage to the reactor equipment itself and the shift catalyst.

The existing coal gasification process takes coal as raw material and pure oxygen and steam as gasification agents for gasification, the content of CO in the product is as high as 50% -76%, the traditional shift converter is difficult to adapt to the high CO shift requirement, the shift requirement is generally achieved by adopting a complex flow of multi-stage, thin bed and multiple intermediate heat exchange, the traditional schemes have long flow, large investment and the hidden danger of temperature runaway which can not be controlled.

Various types of isothermal shift converters with built-in heat transfer tube bundles have appeared at present, for example, in the utility model patent application No. 201821514837.8 entitled "a single cylinder cavity controllable heat transfer type radial isothermal reactor", which utilizes a built-in steam buffer tank and a built-in heat transfer tube to transfer out reaction heat; the utility model patent of application number 201811160922.3 entitled "temperature-variable isothermal shift reactor" realizes the temperature control of the shift converter by utilizing a plurality of heat exchange tube sets and pre-buried heat exchange tubes; the utility model discloses an utility model patent of "an isothermal shift converter", application number "201720874542.0", utilize bow-shaped tube bank and a plurality of upper and lower little tube sheets to realize the temperature control of shift converter. The design and manufacturing experience of the isothermal conversion furnace is relatively complete after the development of the years.

In actual operation, the shift catalyst requires that the raw material gas at the inlet has a catalytic effect only when reaching a certain temperature, so an inlet-outlet heat exchanger is needed to be arranged in the shift process to improve the temperature of the raw material gas, and the heat exchanger is also equipment which bears high temperature and high pressure like a shift reactor, and is high in manufacturing cost. The isothermal shift reactor is a Chinese patent with the patent number of 201410455211.4 and the name of 'an isothermal shift reactor with a built-in tube bundle', and isothermal shift is realized by removing reaction heat by adopting an axial annular tube bundle which is arranged in a catalyst bed layer and uniformly distributed along the circumferential direction; a central tube bundle arranged in a central tube is adopted to preheat feed gas entering a reactor, so that the gas-gas heat exchanger is arranged in a built-in manner; the isothermal transformation reactor comprises a pressure-bearing shell, a catalyst basket, an axial annular tube bundle, a central tube and a central tube bundle; the axial annular tube bundle consists of an upper annular tube box, a lower annular tube box, an upper annular tube plate, a lower annular tube plate and a heat exchange tube. The reactor has the advantages that the gas-gas heat exchanger is arranged in the central tube and is limited by gas flow, and the heat exchange effect of the tube bundle is poor; and the design and manufacture of the reactor are difficult.

In the conversion section, the integrated design flow of the inlet and outlet heat exchanger and the conversion furnace is not seen so far, and in the utility model patent with the name of 'an isothermal conversion process for supporting pulverized coal gasification' and the application number of '201811162826.2', the utility model people load the catalyst in the shell pass of the inlet and outlet heat exchanger as the gas-cooled reactor. The design can improve the utilization rate of the inlet and outlet heat exchangers, but still can not get rid of the traditional design concept that the inlet and outlet heat exchangers and the shift converter are separately arranged, the process is still longer, and the investment is still higher.

In view of the above, there is a need for an isothermal shift reactor that can solve the above-mentioned technical problems in the prior art to meet the needs of practical chemical production operations.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a water-cooling and air-cooling combined isothermal shift reactor, which integrates an inlet/outlet heat exchanger, a water-cooling reactor, and a gas-cooling reactor, so as to shorten the shift process flow and reduce the floor area and investment cost of the reactor.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a water-cooling and air-cooling combined isothermal transformation reactor comprises a pressure-bearing shell;

the feed gas inlet is communicated with the lower end of the pressure-bearing shell;

the transformation gas outlet is communicated with the upper end of the pressure-bearing shell;

the central pipe is coaxially arranged in the pressure-bearing shell, the upper end of the central pipe is inserted into the conversion air outlet, and air holes are uniformly formed in the side wall of the lower section of the central pipe in the pressure-bearing shell;

the gas-cooled tube bundle support is arranged in the pressure-bearing shell, the lower end of the gas-cooled tube bundle support is communicated with the raw material gas inlet, and the lower end of the central tube is erected on the gas-cooled tube bundle support;

the air cooling tube bundle is arranged around the central tube, and the lower end of the air cooling tube bundle is communicated with the air cooling tube bundle support;

the catalyst inner grid is arranged between the gas cooling tube bundle and the central tube;

a water-cooled tube bundle disposed around the gas-cooled tube bundle;

the boiler water inlet penetrates through the side wall of the pressure-bearing shell and is communicated with the lower end of the water-cooled tube bundle;

the boiler water outlet penetrates through the side wall of the pressure-bearing shell and is communicated with the upper end of the water-cooled tube bundle;

the catalyst outer grating is arranged around the water-cooling tube bundle, a gap is reserved between the catalyst outer grating and the pressure-bearing shell, and a catalyst bed layer is filled between the catalyst outer grating and the catalyst inner grating.

Furthermore, the water-cooling tube bundle comprises a plurality of water-cooling tubes which are circumferentially arranged, and the distance between two adjacent water-cooling tubes in the same water-cooling tube bundle is gradually reduced from the outer layer to the inner layer.

Furthermore, a stuffing box is filled between the central pipe and the conversion gas outlet.

Furthermore, heat insulation belts are arranged between the catalyst inner grating and the air cooling tube bundle, between the air cooling tube bundle and the water cooling tube bundle and between the water cooling tube bundle and the catalyst outer grating.

And further, the boiler water outlet is communicated with the water-cooling tube bundle through an expansion joint.

Further, a distributor is arranged between the boiler water inlet and the water-cooled tube bundle, the distributor comprises a lower tube box and a lower tube plate, the lower tube plate is communicated with the water-cooled tube bundle, a collector is arranged between the boiler water outlet and the water-cooled tube bundle, the collector comprises an upper tube box and an upper tube plate, and the upper tube plate is communicated with the water-cooled tube bundle.

Furthermore, inert ceramic balls are filled in the gas-cooled tube bundle support seats.

Further, the included angle between the gas cooling tube bundle and the horizontal plane is 30-60 degrees.

Furthermore, a limiting ring is sleeved outside the air cooling pipe bundle.

Furthermore, a catalyst discharge opening is formed in the lower end of the pressure-bearing shell, and an observation hole is formed in the upper end of the pressure-bearing shell.

Compared with the prior art, the water-cooling and air-cooling combined isothermal transformation reactor has the following advantages:

(1) the water-cooling and air-cooling combined isothermal shift reactor simplifies the traditional shift process, the water gas from gasification directly enters the reactor, the water gas is heated by the air-cooling tube bundle in the reactor, and then is reacted by the catalyst bed layer to release heat, the heat is absorbed and utilized by the water-cooling tube bundle and the air-cooling tube, the heat loss is reduced, the reaction temperature can be controlled in a lower range, and the flow requirement can be met by a single reactor;

(2) compared with the traditional shift reactor, the water-cooling and gas-cooling combined isothermal shift reactor integrates heat exchange of an inlet and an outlet into the reactor, reduces the use of large-caliber high-pressure pipelines, reduces the device investment and series work such as pipeline design, purchase, construction and the like, accelerates the project progress, and effectively reduces the risk of gas leakage;

(3) the water-cooling tube bundles in the water-cooling and air-cooling combined isothermal shift reactor are circumferentially arranged, so that air flow can be uniformly distributed, and the problem of overhigh local temperature of a catalyst bed layer caused by bias short circuit of water gas is effectively avoided;

(4) the water-cooling and air-cooling combined isothermal conversion reactor disclosed by the utility model has the advantages that the water-cooling tube bundle and the boiler water outlet are connected through the expansion joint to absorb the thermal expansion deformation difference between the tube bundle and the pressure-bearing shell, the upper port of the air-cooling tube bundle can eliminate the thermal expansion deformation through free expansion and contraction, and the deformation and even leakage of an inner pipeline of the reactor caused by the stress generated by deformation are avoided;

(5) the gas-cooled tube bundle of the water-cooled gas-cooled combined isothermal shift reactor is pre-buried in a catalyst bed layer, the shift reaction is still continuously carried out in the region, gas at the outlet of the water-cooled reactor enters the shift reactor through the gas-cooled tube bundle, the dew point temperature of the inlet gas is lower, the reaction temperature can be further reduced, the CO content can be further reduced, the damage of dew point corrosion to equipment can be effectively avoided, the raw material gas entering the reactor is heated, and the temperature is raised, so that the product quality can be further improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic diagram illustrating a usage state of a water-cooling and air-cooling combined isothermal conversion reactor according to an embodiment of the present invention;

FIG. 2 is a schematic longitudinal sectional view of a water-gas cooled combined isothermal shift reactor according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a water-cooling and air-cooling combined isothermal shift reactor according to an embodiment of the present invention;

FIG. 4 is a schematic view of a connection structure of a shift reactor in the prior art.

Description of reference numerals:

1. a shift gas outlet; 2. a central tube; 3. a boiler water outlet; 4. an inner catalyst grid; 5. a gas-cooled tube bundle; 6. a water-cooled tube bundle; 7. an outer catalyst grid; 8. a pressure-bearing housing; 9. a boiler water inlet; 10. a raw material gas inlet; 11. a catalyst discharge opening; 12. a gas-cooled tube bundle support; 13. an inlet and outlet heat exchanger; 14. a first stage reactor; 15. a waste heat boiler; 16. a secondary reactor.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 4, in the shift reactor of the prior art, the water gas from gasification enters the inlet and outlet heat exchanger 13 for preheating and then enters the primary reactor 14 through a pipeline, the high-temperature shift gas from the primary reactor 14 enters the waste heat boiler 15 through a pipeline, and after heat is recovered, the high-temperature shift gas returns to the inlet and outlet heat exchanger 13 through a pipeline to heat the water gas from gasification. Due to the high temperatures and reaction equilibrium limitations, it is often necessary to provide a secondary reactor 16 for deep conversion.

As shown in fig. 1-3, the water-cooling and air-cooling combined isothermal shift reactor of the utility model comprises a pressure-bearing shell 8, a raw material gas inlet 10, a shift gas outlet 1, a central tube 2, a gas-cooling tube bundle support 12, a gas-cooling tube bundle 5, a catalyst inner grid 4, a water-cooling tube bundle 6, a boiler water inlet 9, a boiler water outlet 3 and a catalyst outer grid 7, wherein a catalyst bed layer is filled between the catalyst outer grid 7 and the catalyst inner grid 4,

the reactor of the utility model changes the existing flow design, the water gas from gasification directly enters the reactor from the raw material gas inlet 10, the water gas moves along the air cooling tube bundle 5 in the reactor firstly, is heated to a certain temperature under the action of high temperature around the air cooling tube bundle 5, then the heated water gas continues moving in the catalyst bed layer, and reacts under the action of the catalyst bed layer, heat is continuously released in the reaction process, and exchanges heat with the water cooling tube bundle 6 and the air cooling tube bundle 5 which are pre-embedded in the catalyst bed layer in sequence, the heat is absorbed and utilized by the water cooling tube bundle 6 and the air cooling tube bundle 5, so the reaction temperature is always controlled in a lower range, therefore, the flow requirement can be met only by using a single reactor,

a raw material gas inlet 10 is communicated with the lower end of the pressure-bearing shell 8, gasified water gas as a raw material enters the reactor through the raw material gas inlet 10,

the conversion gas outlet 1 is communicated with the upper end of the pressure-bearing shell 8, the converted gas after reaction is discharged out of the reactor from the conversion gas outlet 1,

as shown in fig. 2, the central tube 2 is coaxially disposed in the pressure-bearing housing 8, the length and diameter of the central tube 2 affected by temperature change, specifically, when the temperature in the reactor rises, the length and diameter of the central tube 2 become longer and larger, and when the temperature in the reactor falls, the length and diameter of the central tube 2 become smaller and smaller, if the two ends of the central tube 2 are all rigidly connected, due to the influence of thermal expansion and cold contraction, the central tube 2 deforms with use, even causing air leakage at the joint, so that the reactor cannot work normally, therefore, the lower end of the central tube 2 in this embodiment is a fixed end and the upper end is a movable end, the upper end of the central tube 2 is inserted into the shift gas outlet 1, a packing box is filled between the central tube 2 and the shift gas outlet 1, the pressure difference between the two sides is small, and the resistance of the reactor falls, so as to freely stretch and retract in the shift gas outlet 1, meanwhile, the stuffing box is utilized to absorb the thermal expansion deformation difference between the central tube 2 and the pressure-bearing shell 8, the lower section side wall of the central tube 2 in the pressure-bearing shell 8 is opened in a uniform and sparse mode to control pressure drop and is used for uniformly distributing air flow,

as shown in fig. 2, the gas-cooled tube bundle support 12 is disposed in the pressure-bearing shell 8, the lower end of the gas-cooled tube bundle support 12 is communicated with the raw material gas inlet 10, in this embodiment, the lower end of the gas-cooled tube bundle support 12 is welded with the raw material gas inlet 10, the upper end of the gas-cooled tube bundle support 12 is plugged to serve as a tube plate for installing the gas-cooled tube bundle 5, the lower end of the central tube 2 is welded on the gas-cooled tube bundle support 12 to fix the lower end of the central tube 2, the gas-cooled tube bundle support 12 is filled with inert ceramic balls to play a good supporting role to prevent the deformation of the gas-cooled tube bundle support 12, and simultaneously buffer the impact of the gas raw material entering the reactor on the inner pipeline to prevent the gas flow from being too large and the gas pressure from being too strong to cause the looseness of the reactor inner pipeline, and further improve the distribution of the gas in the reactor,

the gas-cooled tube bundle 5 is pre-embedded in a catalyst bed layer and evenly arranged around the central tube 2, as shown in figure 3, the included angle between the gas-cooled tube bundle 5 and the horizontal plane is 30-60 degrees, the path of gas from the bottom of the reactor to the top of the reactor is prolonged, so that the heat exchange time is increased, the gas raw material reaches proper temperature when being discharged from the gas-cooled tube bundle 5, an operator can adjust the gas inlet speed of the gas raw material according to needs, the lower end of the gas-cooled tube bundle 5 is fixedly communicated with the gas-cooled tube bundle support 12, specifically, the gas-cooled tube bundle support 12 is provided with vent holes, the gas-cooled tube bundle 5 is welded with the gas-cooled tube bundle support 12, the vent holes are hermetically communicated with the inner cavity of the gas-cooled tube bundle 5, the gas-cooled tube bundle 5 is externally sleeved with a limiting ring, the limiting ring plays a role of limiting support on the gas-cooled tube bundle 5 and is mainly used for limiting the transverse displacement of the gas-cooled tube bundle 5, and the problem that tube bundle vibration possibly caused by large gas flow of the inlet and outlet heat exchanger 13 is essentially avoided, meanwhile, because the lower end of the air cooling tube bundle 5 is a fixed end, the air cooling tube bundle 5 can deform under the temperature change, the limiting ring can allow the upper end of the air cooling tube bundle 5 to freely stretch and retract in the pressure-bearing shell 8 so as to eliminate thermal expansion deformation and prolong the service life of the air cooling tube bundle 5,

as shown in FIG. 3, the water-cooled tube bundle 6 is arranged around the gas-cooled tube bundle 5, the water-cooled tube bundle 6 comprises a plurality of water-cooled tube groups arranged in a multi-layer manner from outside to inside, each water-cooled tube group comprises a plurality of water-cooled tubes arranged in a circumference manner, the number of the water-cooled tubes in each water-cooled tube group is the same, as the circumference length gradually increases from inside to outside, the distance between two adjacent water-cooled tubes in the same water-cooled tube group gradually decreases from the outer layer to the inner layer, so that the water-cooled tube bundle 6 is arranged in a sparse and dense manner from outside to inside, a boiler water inlet 9 penetrates through the side wall of the pressure-bearing shell 8 to be communicated with the lower ends of the water-cooled tube bundles 6, a boiler water outlet 3 penetrates through the side wall of the pressure-bearing shell 8 to be communicated with the upper ends of the water-cooled tube bundles 6, gas in reaction penetrates through the gaps between the water-cooled tubes, heat released by reaction is absorbed and taken away by boiler water in the water-cooled tubes, thereby reducing the reaction temperature, as the water-cooled tubes are arranged uniformly, the over-cooled tube groups can prevent over-reaction temperature, the boiler water outlet 3 is communicated with the water-cooling tube bundle 6 through an expansion joint and is used for absorbing the thermal expansion deformation difference between the water-cooling tube bundle 6 and the pressure-bearing shell 8,

the catalyst inner grid 4 is arranged between the gas cooling tube bundle 5 and the central tube 2, the catalyst outer grid 7 is arranged around the water cooling tube bundle 6, a catalyst bed layer is filled between the catalyst outer grid 7 and the catalyst inner grid 4, a gap is reserved between the catalyst outer grid 7 and the pressure-bearing shell 8, the catalyst outer grid 7 is used for enabling gas to gradually move downwards and penetrate through the catalyst outer grid 7 to be in contact with the catalyst bed layer to react, the gas continuously penetrates through the catalyst bed layer and the catalyst inner grid 4 in sequence, finally enters the central tube 2, upwards flows along the central tube 2, and is discharged out of the reactor from the conversion gas outlet 1.

The reaction process of the water-cooling and air-cooling combined isothermal transformation reactor comprises the following steps:

the water gas enters a reactor from a raw material gas inlet 10, firstly enters a gas cooling tube bundle support 12, the water gas upwards passes through a gas cooling tube bundle 5, absorbs heat released by a conversion reaction, so that the heating temperature of the water gas is increased, the heated water gas enters an upper end socket of the reactor, is directly distributed by the upper end socket and then descends along a gap between an outer catalyst grid 7 and a pressure-bearing shell 8, then radially passes through a catalyst bed layer from outside to inside, in the process, the water gas sequentially passes through the outer catalyst grid 7, a water cooling tube bundle 6, a gas cooling tube bundle 5 and an inner catalyst grid 4, then enters a central tube 2 through air vents on the central tube 2 to be collected, the collected conversion gas upwards flows out of the reactor through a conversion gas outlet 1, the heat released by the conversion reaction is absorbed and utilized by a water cooling tube bundle 6 and a gas cooling tube which exchange heat with the gas, so that not only the preheating of the raw material gas is realized, but also the recycling of the heat is improved, the heat loss is reduced, and the reaction temperature can be always controlled in a lower range, so that the flow requirements can be met by using a single reactor in the utility model.

Specifically, when water gas passes through a catalyst bed layer through a gas-cooled tube bundle 5, the water gas absorbs heat released by a shift reaction, the water gas can be preheated, the catalytic reaction efficiency is improved, boiler water enters from a boiler water inlet 9, passes through a water-cooled tube bundle 6 from bottom to top and then flows out from a boiler water outlet 3, and the boiler water can absorb heat released by the shift reaction when passing through the catalyst bed layer, so that the relative stability of the reaction temperature is maintained, the reaction balance moves forward, and the reaction is more thorough.

Furthermore, heat insulation belts are arranged between the catalyst inner grid 4 and the air cooling tube bundle 5, between the air cooling tube bundle 5 and the water cooling tube bundle 6 and between the water cooling tube bundle 6 and the catalyst outer grid 7, so that the temperature of the heat exchange gas can be increased, the temperature difference of the heat transfer of the air cooling tube bundle 5 can be increased, and the preheating temperature of the water gas can be increased.

Further, be equipped with the distributor between boiler water entry 9 and the water-cooled tube bundle 6, the distributor includes down pipe case and lower tube sheet, lower tube sheet and water-cooled tube bundle 6 intercommunication, be equipped with the collector between boiler water export 3 and the water-cooled tube bundle 6, the collector includes last pipe case and last tube sheet, it is more even to go up pipe case and water-cooled tube bundle 6 intercommunication, makes boiler water distribution, and the heat exchange is more even, prevents that local temperature is too high in the reactor, and the heat can't in time be discharged, causes the influence to the reaction result.

Furthermore, the lower end of the pressure-bearing shell 8 is provided with a catalyst discharge opening 11 for discharging the catalyst in the reactor, and the upper end of the pressure-bearing shell 8 is provided with an observation hole for observing the inside of the reactor or maintaining the reactor.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A water-cooling and air-cooling combined isothermal shift reactor is characterized in that: comprises a pressure-bearing shell;

the feed gas inlet is communicated with the lower end of the pressure-bearing shell;

the transformation gas outlet is communicated with the upper end of the pressure-bearing shell;

the central pipe is coaxially arranged in the pressure-bearing shell, the upper end of the central pipe is inserted into the conversion air outlet, and air holes are uniformly formed in the side wall of the lower section of the central pipe in the pressure-bearing shell;

the gas-cooled tube bundle support is arranged in the pressure-bearing shell, the lower end of the gas-cooled tube bundle support is communicated with the raw material gas inlet, and the lower end of the central tube is erected on the gas-cooled tube bundle support;

the air cooling tube bundle is arranged around the central tube, and the lower end of the air cooling tube bundle is communicated with the air cooling tube bundle support;

the catalyst inner grid is arranged between the gas cooling tube bundle and the central tube;

a water-cooled tube bundle disposed around the gas-cooled tube bundle;

the boiler water inlet penetrates through the side wall of the pressure-bearing shell and is communicated with the lower end of the water-cooled tube bundle;

the boiler water outlet penetrates through the side wall of the pressure-bearing shell and is communicated with the upper end of the water-cooled tube bundle;

the catalyst outer grating is arranged around the water-cooling tube bundle, a gap is reserved between the catalyst outer grating and the pressure-bearing shell, and a catalyst bed layer is filled between the catalyst outer grating and the catalyst inner grating.

2. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: the water-cooled tube bundle comprises a plurality of water-cooled tubes which are circumferentially arranged, and the distance between every two adjacent water-cooled tubes in the same water-cooled tube bundle is gradually reduced from the outer layer to the inner layer.

3. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: and a stuffing box is filled between the central pipe and the conversion gas outlet.

4. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: insulating bands are arranged between the catalyst inner grating and the air cooling tube bundle, between the air cooling tube bundle and the water cooling tube bundle and between the water cooling tube bundle and the catalyst outer grating.

5. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: the boiler water outlet is communicated with the water-cooling tube bundle through an expansion joint.

6. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: the boiler water-cooling system is characterized in that a distributor is arranged between the boiler water inlet and the water-cooling tube bundle, the distributor comprises a lower tube box and a lower tube plate, the lower tube plate is communicated with the water-cooling tube bundle, a collector is arranged between the boiler water outlet and the water-cooling tube bundle, the collector comprises an upper tube box and an upper tube plate, and the upper tube plate is communicated with the water-cooling tube bundle.

7. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: inert ceramic balls are filled in the gas-cooled tube bundle support seats.

8. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: the included angle between the gas cooling tube bundle and the horizontal plane is 30-60 degrees.

9. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: and a limiting ring is sleeved outside the air cooling pipe bundle.

10. The water-gas cooled combined isothermal shift reactor of claim 1, wherein: the lower end of the pressure-bearing shell is provided with a catalyst discharge opening, and the upper end of the pressure-bearing shell is provided with an observation hole.

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