CN212409377U

CN212409377U - Tube furnace

Info

Publication number: CN212409377U
Application number: CN202020465302.7U
Authority: CN
Inventors: 满朝波; 韩虎
Original assignee: Changchun Anyang Environmental Protection Technology Co ltd
Current assignee: Changchun Anyang Environmental Protection Technology Co ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2021-01-26
Anticipated expiration: 2030-04-02

Abstract

A tube furnace consisting of a furnace body (1), characterized in that the furnace body (1) comprises a shell made of steel sheet, the inside of which is lined with refractory and heat-insulating material, a coil path (3) is arranged in the furnace body (1) and in which the fluid is in a heating flow, a regenerative heating burner system (4) becoming the heat source; a plurality of coil paths are provided in the furnace, each coil path (3) is composed of a straight heating tube, and each heating tube is vertically arranged at the center of the furnace (1), then the end of each coil path (3) is connected to a shunt tube (3 a) for distributing the fluid to be heated out of the furnace body (1) before being introduced into the furnace body, and the other end is connected to a collection tube (3 b) for collecting the fluid to be distributed into each heating tube.

Description

Tube furnace

Technical Field

The utility model relates to a tube furnace belongs to tube furnace equipment technical field.

Background

At present, a coking problem and low combustion efficiency exist in a tubular furnace generally, and a low-temperature corrosion problem of a heating pipe caused by sulfur contained in fuel also exists.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects and shortcomings, the utility model provides a tube furnace.

The utility model discloses a solve the technical scheme that technical problem adopted as follows:

a tube furnace is composed of a furnace body, the furnace body comprises a shell made of steel plates, the inner side of the shell is lined with fireproof and heat-insulating materials, a heating tube is arranged in the furnace body, fluid in the heating tube flows in the heating tube, and a regenerative heating type burner system is used as a heat source; the furnace is provided with a plurality of heating pipes, each heating pipe consists of a straight heating pipe, each heating pipe is vertically arranged in the center of the furnace body, then the end part of each heating pipe is connected to a shunt pipe to distribute fluid to be heated out of the furnace body before being introduced into the furnace body, the other end of each heating pipe is connected to a collecting pipe, and the fluid is collected to be distributed into each heating pipe; the furnace body is divided into a plurality of first areas, second areas, third areas and fourth areas by integrally forming a plurality of upper channel partitions and lower channel partitions, i.e., the furnace body is formed by connecting together in the vertical direction thereof four approximately cross-shaped furnace bodies while establishing open communication in the same vertical direction therebetween; a combustion chamber of the furnace body between the upper channel partition plate and the lower channel partition plate is a combustion chamber and generates flame, and an external space of the furnace body is used for arranging at least one space of the regenerative heating type burner; the burner system forms an upper channel partition and a lower channel partition distributed in the combustion chamber and connected to the other channel partitions, each of the first zone, the second zone, the third zone and the fourth zone being opposed to each other through vertical joint walls, and a central channel communicating each of the first zone, the second zone, the third zone and the fourth zone being provided between the opposed right and left joint walls; at least one regenerative heating type burner system is provided in each of the first, second, third and fourth zones, a plurality of the first, second, third and fourth zones having the regenerative heating type burner systems independent of each other are connected to each other to constitute the entire single tube furnace, and a heating zone of a heating pipe passing through a furnace body is divided into a plurality of zones; the regenerative heating type burner system comprises two units, each unit comprising a regeneration bed and a burner integrally assembled by coupling, a pipe combination in which the regeneration bed is built in a burner body to alternately perform combustion, and exhaust gas may be discharged through the non-combustible burner and the regeneration bed; the regenerative heating type burner system further includes a combustion air supply system for supplying combustion air and a combustion gas exhaust system for exhausting combustion gas to be selectively connected with each of the regeneration beds of the first burner and the second burner, the two units passing through a four-way valve such that combustion air is supplied to the first burner through the regeneration bed and combustion gas is exhausted from the second burner through the regeneration bed, the combustion gas is forcibly fan-supplied, combustion gas is sucked from the furnace through an exhaust means and then exhausted to the atmosphere, and the fuel supply system is selectively connected to one of the first burner or the second burner through a three-way valve in an alternating manner to supply fuel, the fuel nozzle is embedded in the throat portion of the burner body, and the injection portion thereof is disposed on the inner surface of the throat portion such that the nozzle is not exposed to the combustion gas; a four-way valve for changing the flow passage of the exhaust combustion gas and the combustion air and a three-way valve for changing the flow passage of the fuel to change the flow passage of all the fuel and the flow passage of the primary actuator, the three-way valve and the four-way valve being controllable separately from each other; also comprises combustion air and fuel which are also partially distributed to a pilot burner spray gun, a flame sensor and a transformer for igniting the pilot burner, wherein each pipeline is provided with a solenoid valve, a manual valve, a pipeline for supplying steam, a pipeline for supplying air and a pipeline for supplying fuel gas; the regenerative bed comprises a cylinder having a plurality of honeycomb-shaped cell pores, and is made of a ceramic material having a large heat capacity and high durability with a relatively small pressure loss; a regenerative heating type burner system is constituted by a pair of a first burner and a second burner which are arranged side by side on the same upper passage partition and which are one of a plurality of burners, the pair of the first burner and the second burner are respectively arranged on the upper passage partition and the lower passage partition which are opposed to each other, and which constitute combustion chambers in each of the first region, the second region, the third region and the fourth region of the furnace body, and combustion gas discharged from the first burner of the regenerative heating type burner system on the upper passage partition is discharged through the second burner of the other regenerative heating type burner system.

The utility model discloses the beneficial effect who reaches is: solves the coking problem, has high combustion efficiency, and simultaneously solves the problem of low-temperature corrosion of a heating pipe caused by sulfur contained in fuel.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic circuit diagram of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, a tube furnace is composed of a furnace body 1, the furnace body 1 includes a shell made of a steel plate, the inside of the shell is lined with a refractory and heat insulating material, a heating pipe 3 is provided in the furnace body 1 and in which a fluid is heated to flow, a regenerative heating type burner system 4 becomes a heat source; a plurality of heating pipes are arranged in the furnace, each heating pipe 3 consists of a straight heating pipe, each heating pipe is vertically arranged in the center of the furnace body 1, then the end part of each heating pipe 3 is connected to a shunt pipe 3a to distribute fluid to be heated out of the furnace body 1 before being introduced into the furnace body, and the other end of each heating pipe is connected to a collecting pipe 3b to collect the fluid to be distributed into each heating pipe; the furnace body 1 is divided into a plurality of zones one 2a, two 2b, three 2c and four 2d by forming a plurality of upper passage partitions 20a and lower passage partitions 20b in an integral manner, i.e., the furnace body is formed by connecting together four substantially cross-shaped furnace bodies in the vertical direction thereof while establishing open communication therebetween in the same vertical direction; a combustion chamber 21 of the furnace body between the upper passage partition 20a and the lower passage partition 20b is a combustion chamber and generates a flame, and an outer space 22 of the furnace body is a space for disposing at least one regenerative heating type burner; the burner system 4 constitutes an upper passage partition 20a and a lower passage partition 20b distributed in the combustion chamber and connected to the other passage partitions, each of the zones one 2a, two 2b, three 2c and four 2d being opposed to each other by a vertical joint wall 20c, and a central passage 23 communicating each of the zones one 2a, two 2b, three 2c and four 2d being provided between the opposed right and left joint walls 20 c; at least one regenerative heating type burner system 4 is provided in each of the zone one 2a, the zone two 2b, the zone three 2c, and the zone four 2d, and a plurality of zones one 2a, zone two 2b, zone four of the regenerative heating type burner systems 4 independent of each other are providedThe third 2c and the fourth 2d are connected to each other to constitute the entire single tube furnace, and the heating area of the heating tube 3 by the furnace body is divided into a plurality of zones; the regenerative heating type burner system 4 comprises two units, each unit comprising a regenerative bed and a burner integrally assembled by coupling, a pipe combination in which the regenerative bed is built in a burner body to alternately perform combustion, and exhaust gas can be discharged through the non-combustible burner and the regenerative bed; the regenerative heating type burner system 4 further includes a combustion air supply system for supplying combustion air and a combustion gas exhaust system 9 for exhausting combustion gas to be selectively connected to each of the regeneration beds 7 of the first burner 5 and the second burner 6, both units are connected through a four-way valve 10 such that combustion air is supplied to one of the first burner 5 (or the second burner 6) through the regeneration bed 7, combustion gas is exhausted from the other of the second burner 6 (or the second burner 5) through the regeneration bed 7, the combustion gas is forcibly fan-supplied, the combustion gas is sucked from the furnace through an exhaust means and then exhausted to the atmosphere, and the fuel supply system 11 is selectively connected to one of the first burner 5 or the second burner 6 through a three-way valve 12 in an alternate manner to supply fuel, a fuel nozzle 15 is embedded in the throat of the burner body 14 and an injection portion thereof is provided on the inner surface of the throat, such that the nozzle is not exposed to combustion gases; a four-way valve 10 for changing the flow passage of the exhaust combustion gas and the combustion air and a three-way valve 12 for changing the flow passage of the fuel to change the flow passage of all the fuel and the flow passage of the primary actuator 13, the three-way valve 12 and the four-way valve 10 being controllable separately from each other; also included are combustion air and fuel also partly distributed to the pilot burner lances 16, flame sensors 17, transformer 18 for igniting the pilot burner, in each of which is installed a solenoid valve, a manual valve, a line 19 for supplying steam for suppressing NO due to preheating of the combustion air, a line 8 for supplying air, a line 11 for supplying gas fuel_xAn increase in the exhaust value; the regenerative bed 7 comprises a cylinder having a plurality of honeycomb-shaped cell pores, and is made of a ceramic material having a large heat capacity and high durability with a relatively small pressure loss; a regenerative heating type burner system 4 composed of a pair of a first burner 5 and a second burner 6And a configuration in which they are arranged side by side on the same upper passage partition plate 20a (or lower passage partition plate 20b) and the burner is one of a plurality of burners, a pair of a first burner 5 and a second burner 6 are respectively arranged on the opposite upper passage partition plate 20a and lower passage partition plate 20b, which together constitute a combustion chamber 21 in each of a first region 2a, a second region 2b, a third region 2c and a fourth region 2d of the furnace body 1, and combustion gas discharged from the first burner 5 of the regenerative heating type burner system 4 on the upper passage partition plate 20a is discharged through the second burner 6 of the other regenerative heating type burner system. On the opposite lower passage partition plate 20b, at the same time, the combustion gas discharged from the burner one 5 of the regenerative heating type burner system 4 on the lower passage partition plate 20b is discharged through the burner two 6 on the upper passage partition plate 20a, so it can be said that the combustion gas of the combustion gas and the combustion gas of the exhaust gas are alternately performed through the adjacent burners; in this case, since fuel and combustion air are selectively supplied to one burner adjacent to each other on the same channel partition plate, the burners provided on the same upper channel partition plate 20a and lower channel partition plate 20b may be combined to constitute one regenerative heating type burner system 4, and the flow of combustion gas is changed between the regenerative heating type burner systems 4, provided on the opposite sides and both sides of the combustion chamber 21, and forming flames in parallel to the heating pipes 3.

Incidentally, the arrangement of the burners is not limited to the above arrangement. For example, burners provided on the upper and lower passage partitions may be combined to constitute one regenerative heating type burner system 4. With the above arrangement, by making one burner-one 5 of the regenerative heating type burner system 4 burn and making the combustion gas stationary through the combustion gas exhaust system 9 of the other burner, for example, in the burner-two 6 of the other regenerative heating type burner system, the flame and the combustion gas flow in parallel to the heating pipe 3, and the combustion gas is then exhausted from the outside of the furnace body without flowing out to any other area. The fluid to be heated flowing into the heating pipe 3 at this time is heated by the radiant heat of the flame and the combustion gas, because the combustion air is supplied into the burner body 14 after being preheated in the regeneration bed 7, i.e., at high temperatures (about 1000 c), near the exhaust gas temperature, and, therefore, at temperatures close to the temperature of the fuel injected through the fuel nozzles 15, combustion is stably performed even if the amount of fuel and high temperature is small, and since the temperature of combustion air is rapidly changed in response to an increase or decrease in the amount of combustion, it is easy to perform desired combustion gas temperature adjustment with high response, for the other burner two 6, the fuel supply system 11 connected to the burner two 6 is closed by the three-way valve 12, and the four-way valve 10 is switched to connect the second burner 6 with the combustion gas exhaust system 9 so that the second burner 6 does not enter a combustion state and serves as an exhaust passage for the exhaust combustion gas. Specifically, the exhaust combustion gas passes through the stationary burner two 6 and the associated regeneration bed 7, while releasing heat to the regeneration bed 7, and the resulting low temperature gas is discharged through the four-way valve 10. Therefore, the gas generated in each of the zone one 2a, the zone two 2b, the zone three 2c, and the zone four 2d by the combustion is discharged through the regenerative bed 7 outside the furnace without flowing out to any other zone. Therefore, the temperature control of each of the zone one 2a, the zone two 2b, the zone three 2c, and the zone four 2d can be achieved independently of each other by the regenerative heating type burner system. Therefore, by independently controlling the combustion amount of each of the zone one 2a, the zone two 2b, the zone three 2c, and the zone four 2d, each heat flux in the respective zone one 2a, the zone two 2b, the zone three 2c, and the zone four 2d can be set in the same structure: the boundary layer temperature is the maximum temperature at which the fluid to be heated remains below the coking temperature or is allowed for all zones, which is determined in view of the material used as the heating tube and is almost the same temperature level, i.e. as high a heat flux as possible can be set in each of the zone one 2a, the zone two 2b, the zone three 2c and the zone four 2d, close to the critical degree of prevention of coking. In this case, the furnace body is operated, for example, in such a manner that the combustion amount of the regenerative heating type is predetermined. The burner system 4 of each of the first zone 2a, the second zone 2b, the third zone 2c and the fourth zone 2d is matched with the above-described heat flux pattern, and controls the combustion amount in the entire furnace at the outlet of the furnace by using the temperature sensor 24 provided so that the temperature of the fluid to be heated at the outlet of the furnace is maintained at the set temperature without changing the ratio of each combustion amount to the entire combustion amount, and therefore, the throughput can be controlled, maintaining high heating efficiency.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tube furnace is composed of a furnace body, the furnace body comprises a shell made of steel plates, the inner side of the shell is lined with fireproof and heat-insulating materials, a heating tube is arranged in the furnace body, fluid in the heating tube flows in the heating tube, and a regenerative heating type burner system is used as a heat source; the furnace is provided with a plurality of heating pipes, each heating pipe consists of a straight heating pipe, each heating pipe is vertically arranged in the center of the furnace body, then the end part of each heating pipe is connected to a shunt pipe to distribute fluid to be heated out of the furnace body before being introduced into the furnace body, the other end of each heating pipe is connected to a collecting pipe, and the fluid is collected to be distributed into each heating pipe; the furnace body is divided into a plurality of first areas, second areas, third areas and fourth areas by integrally forming a plurality of upper channel partitions and lower channel partitions, i.e., the furnace body is formed by connecting together in the vertical direction thereof four approximately cross-shaped furnace bodies while establishing open communication in the same vertical direction therebetween; a combustion chamber of the furnace body between the upper channel partition plate and the lower channel partition plate is a combustion chamber and generates flame, and an external space of the furnace body is used for arranging at least one space of the regenerative heating type burner; the burner system forms an upper channel partition and a lower channel partition distributed in the combustion chamber and connected to the other channel partitions, each of the first zone, the second zone, the third zone and the fourth zone being opposed to each other through vertical joint walls, and a central channel communicating each of the first zone, the second zone, the third zone and the fourth zone being provided between the opposed right and left joint walls; at least one regenerative heating type burner system is provided in each of the first, second, third and fourth zones, a plurality of the first, second, third and fourth zones having the regenerative heating type burner systems independent of each other are connected to each other to constitute the entire single tube furnace, and a heating zone of a heating pipe passing through a furnace body is divided into a plurality of zones; the regenerative heating type burner system comprises two units, each unit comprising a regeneration bed and a burner integrally assembled by coupling, a pipe combination in which the regeneration bed is built in a burner body to alternately perform combustion, and exhaust gas may be discharged through the non-combustible burner and the regeneration bed; the regenerative heating type burner system further includes a combustion air supply system for supplying combustion air and a combustion gas exhaust system for exhausting combustion gas to be selectively connected with each of the regeneration beds of the first burner and the second burner, the two units passing through a four-way valve such that combustion air is supplied to the first burner through the regeneration bed and combustion gas is exhausted from the second burner through the regeneration bed, the combustion gas is forcibly fan-supplied, combustion gas is sucked from the furnace through an exhaust means and then exhausted to the atmosphere, and the fuel supply system is selectively connected to one of the first burner or the second burner through a three-way valve in an alternating manner to supply fuel, the fuel nozzle is embedded in the throat portion of the burner body, and the injection portion thereof is disposed on the inner surface of the throat portion such that the nozzle is not exposed to the combustion gas; a four-way valve for changing the flow passage of the exhaust combustion gas and the combustion air and a three-way valve for changing the flow passage of the fuel to change the flow passage of all the fuel and the flow passage of the primary actuator, the three-way valve and the four-way valve being controllable separately from each other; also comprises combustion air and fuel which are also partially distributed to a pilot burner spray gun, a flame sensor and a transformer for igniting the pilot burner, wherein each pipeline is provided with a solenoid valve, a manual valve, a pipeline for supplying steam, a pipeline for supplying air and a pipeline for supplying fuel gas; the regenerative bed comprises a cylinder having a plurality of honeycomb-shaped cell pores, and is made of a ceramic material having a large heat capacity and high durability with a relatively small pressure loss; a regenerative heating type burner system is constituted by a pair of a first burner and a second burner which are arranged side by side on the same upper passage partition and which are one of a plurality of burners, the pair of the first burner and the second burner are respectively arranged on the upper passage partition and the lower passage partition which are opposed to each other, and which constitute combustion chambers in each of the first region, the second region, the third region and the fourth region of the furnace body, and combustion gas discharged from the first burner of the regenerative heating type burner system on the upper passage partition is discharged through the second burner of the other regenerative heating type burner system.