Modularized vertical type direct current steam injection boiler with coil pipe

Abstract

The utility model relates to the field of oil field steam-injection boiler devices, and discloses a modular vertical direct-current steam-injection boiler with a coil pipe, which comprises a radiation section and a heated section, a burner is arranged at the top of the radiation section, the heated section is communicated with an outlet flue, the radiation section and the heated section are vertically arranged and are communicated through a steering flue at the bottom, and the coil pipe is arranged in the radiation section. Wherein the furnace tube in the radiation section is sectionally arranged from top to bottom, and the tail heating surface in the heating section is respectively packaged by adopting a tube box structure; and the tail heating surface in the heating section is communicated with the furnace tube in the middle in the radiation section for working medium exchange to form a pipeline structure in which a working medium circularly flows. The utility model has the beneficial effects that the structure is compact, the occupied area is small, the transportation difficulty and the construction difficulty are reduced, and the tail heating surface in the heating section is communicated with the furnace tube in the middle in the radiation section to avoid heat transfer deterioration.

Description

Technical Field

[0001] The utility model relates to the field of oil field steam injection boiler devices, in particular to a modular vertical direct current steam injection boiler with coils. Background Art

[0002] Oilfield steam injection boilers are a new type of boiler designed specifically for thermal recovery using injected gaseous working fluids. Their circulation characteristics are generally forced circulation. They rely on the high pressure generated by the boiler's feedwater pump to force the working fluid to circulate within the boiler. Operating in principle, oilfield steam injection boilers are high-pressure, direct-current boilers. They utilize the high-temperature, high-pressure, wet gaseous working fluid they produce to inject into oil wells, heating the crude oil in the reservoir to reduce its viscosity, thereby increasing its fluidity and significantly improving its recovery rate. Consequently, they are widely used in the extraction of heavy and extra-heavy oil in various oilfields across my country, serving as core equipment for heavy oil extraction.

[0003] Currently, steam injection boilers are mostly arranged horizontally, with the radiant section arranged horizontally, occupying a large area. For mining platforms with restricted areas, such as offshore mining, the equipment footprint is greatly restricted, and therefore the boiler output is limited. In addition, the furnace tubes and tail heating surfaces of the radiant section mostly adopt an integral integrated packaging structure, which poses great challenges in transportation, on-site lifting, and installation. In addition, certain parts of the furnace tubes are in an overheated state for a long time, which also makes it easy for heat transfer to deteriorate. Utility Model Content

[0004] In order to overcome the problems in the above-mentioned background technology that the horizontally arranged steam injection boiler occupies a large area, is prone to heat transfer deterioration, and the integrated packaging structure is difficult to transport and install on site, the utility model provides a modular vertical direct current steam injection boiler with a coil. The radiation section and the heating section of the steam injection boiler are arranged vertically, and the furnace tubes in the radiation section are segmented and the rear heating surface is separately packaged with a tube box structure. A multi-module arrangement is adopted, which has a compact structure, a small footprint, reduced transportation difficulty and construction difficulty, and the rear heating surface in the heating section is connected with the furnace tube located in the middle of the radiation section to avoid the beneficial effect of heat transfer deterioration.

[0005] The technical solution of the utility model is as follows:

[0006] A modular vertical direct-flow steam injection boiler with coils comprises a radiation section and a heating section, wherein a burner is arranged at the top of the radiation section, and the heating section is connected to an outlet flue. Both the radiation section and the heating section are arranged vertically and connected via a turning flue at the bottom. The furnace tubes in the radiation section are arranged in sections from top to bottom, and the rear heating surfaces in the heating section are respectively encapsulated by a tube box structure. The rear heating surfaces in the heating section are connected to the furnace tubes located in the middle of the radiation section for working medium exchange, thereby forming a pipeline structure for circulating working medium.

[0007] Compared with the existing technology, the beneficial effects of this technical solution are:

[0008] (1) Since the radiation section and the heating section are both arranged vertically and connected through the turning flue at the bottom, the overall vertical U-shaped layout is adopted. This can solve the problem that the steam injection boilers in the background art mostly adopt horizontal layout and occupy a large area, which limits the output of the boiler. It has the advantages of compact structure and small footprint;

[0009] (2) By arranging the furnace tubes in the radiation section in sections from top to bottom, and respectively encapsulating the rear heating surface in the heating section with a tube box structure, a modular design is adopted, which can solve the problem in the background technology that the furnace tubes in the radiation section and the rear heating surface adopt an integrated packaging structure, which is difficult to transport, hoist and install on site, and has the beneficial effects of low on-site construction difficulty and convenient operation;

[0010] (3) The segmented arrangement of the furnace tubes in the radiation section can also control the flow direction of the working medium in the furnace tubes in each segment, interfere with the heat exchange of each segment, and ensure the safe operation of the boiler. The tail heating surface in the heating section is connected with the furnace tube located in the middle of the radiation section, so that the working medium in the liquid state of the tail heating surface enters from the middle of the radiation section, which can effectively avoid the deterioration of heat transfer in the furnace tube;

[0011] (4) The entire boiler is modular and easy to install. This boiler structure is very suitable for places with limited floor space, weak lifting capacity, and high boiler evaporation capacity requirements.

[0012] Preferably, the furnace tubes in the radiation section are divided into three sections: an upper tube, a middle tube and a lower tube, adjacent tubes are interconnected, and the working fluid inlet of the radiation section is arranged at the middle tube, and the working fluid outlet is arranged at the lower tube.

[0013] Further preferably, the furnace tubes in the radiation section adopt a multi-coil structure, and each section of the furnace tubes extends upward in a spiral shape.

[0014] Preferably, the side walls of the flue in the radiation section are made of needle-punched aluminum silicate fiber felt material and insulation block material; the furnace tubes in the radiation section and the side walls of the flue are stably connected by pipe clamps, and the pipe clamps are vertically arranged in an "E" shape, and the edges of adjacent furnace tubes are sequentially inserted into the two bayonet holes of the pipe clamps.

[0015] Further preferably, the tail heating surface includes a spiral finned tube economizer, a bare tube economizer and a superheater that are interconnected, wherein the working fluid outlet of the bare tube economizer and the working fluid inlet of the superheater are respectively connected to the working fluid inlet and working fluid outlet of the radiation section.

[0016] Further preferably, the superheater, bare tube economizer and spiral fin tube economizer are respectively packaged in different tube boxes and stacked in sequence from bottom to top via a bracket fixed on the inner wall of the flue of the heating section.

[0017] Further preferably, the superheater and light tube economizer are located in the high-temperature section of the heating section, and the flue side walls of the high-temperature section are filled with lightweight castables to achieve thermal insulation; the spiral fin tube economizer is located in the low-temperature section of the heating section, and the flue side walls of the low-temperature section are insulated with insulation board materials.

[0018] Preferably, the turning flue is a U-shaped structure with an ash discharge port at the bottom, and its side walls are connected by guard plates, and the interior of the guard plates is filled with lightweight thermal insulation castable.

[0019] Preferably, the radiation section is arranged in the outer shell, which is a cylindrical structure, the bottom of which is fixed to one side of the surface of the supporting steel frame and is stably connected to the supporting steel frame through a supporting saddle on the circumference of the outer shell.

[0020] Further preferably, the heating section is arranged in the shell, which is a square cylinder structure, the bottom of which is fixed to the other side of the support steel frame surface, and the outer wall of the shell is fixedly connected to the support steel frame through a connecting frame evenly arranged circumferentially from top to bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic structural diagram of the middle portion of the radiation section of the utility model;

[0024] Figure 3 It is a top view of the utility model.

[0025] Figure numerals: radiation section 1, furnace tube 11, upper pipe 12, middle pipe 13, lower pipe 14, pipe clamp 15, shell 16, support saddle 17, heating section 2, spiral fin tube economizer 21, bare tube economizer 22, superheater 23, shell 24, connecting frame 25, outlet flue 26, chimney 27, bracket 28, turning flue 3, ash outlet 31, guard plate 32, flue 4, burner 5, support steel frame 6. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Example 1: Figures 1 to 3 The modular vertical direct-flow steam injection boiler with coils shown includes a radiation section 1 and a heating section 2. The radiation section 1 includes a flue 4 and a furnace tube 11 arranged in the flue 4. The working medium flows in the furnace tube 11. The burner 5 is arranged at the top of the flue 4. The burner 5 atomizes the fuel and mixes it with air and sprays it into the flue of the radiation section 1. When started, the ignition gun in the burner 5 ignites the fuel in the flue 4. The combustion generates high-temperature flue gas that passes through the flue 4 and heats the working medium in the furnace tube 11; the heating section 2 includes a flue 4 and a rear heating surface arranged in the flue 4. The working medium flows in the rear heating surface. The flue 4 is connected to the outlet flue 26, and the outlet flue 26 is connected to the chimney 27. The flue gas is discharged through the chimney 27.

[0028] The radiant section 1 and the heated section 2 are both arranged vertically and connected by a deflecting flue 3 at the bottom. Flue gas flows from the flue of the radiant section 1 through the deflecting flue 3 into the flue 4 of the heated section 2. The furnace tube 11 of the radiant section 1 is arranged in sections from top to bottom, that is, the furnace tube 11 is divided into multiple sections from top to bottom. The pipe openings between different sections are connected by connecting pipe fittings, which makes transportation and on-site operations more convenient. The rear heating surface within the heated section 2 is separately encapsulated using a pipe box structure. That is, the different devices within the rear heating surface are separately encapsulated in pipe boxes. During on-site operations, the encapsulated pipe boxes are sequentially installed in the heated section 2 in an overlapping manner, and then the connecting pipe fittings between the pipe boxes are connected. Among them, the tail heating surface in the heating section 2 is connected with the furnace tube 11 located in the middle of the radiation section 1, and together they constitute a pipeline structure for the circulation of the working medium. Since the burner 5 is arranged at the top of the flue 4 of the radiation section 1, the flue gas generated by the combustion in the upper part of the flue 4 of the radiation section 1 spreads downward from the top of the flue 4, and the flue gas will float up due to its own nature. Therefore, the furnace tube 11 in the middle position of the flue 4 is actually subjected to the strongest heat radiation and the highest temperature. Therefore, the furnace tube 11 at this position is also more prone to heat transfer deterioration. At this position, it can be connected with the tail heating surface, and the working medium in the tail heating surface can enter the furnace tube at this position in a liquid state to reduce the temperature of the furnace tube 11, thereby avoiding heat transfer deterioration.

[0029] Since the radiation section 1 and the heating section 2 are both arranged vertically and connected through the turning flue 3 at the bottom, the overall vertical U-shaped arrangement is adopted, so it can solve the problem that the steam injection boiler in the background technology mostly adopts a horizontal arrangement with a large floor space and the output of the boiler is limited, and has the advantages of compact structure and small floor space; by arranging the furnace tubes 11 in the radiation section 1 from top to bottom in sections, the tail heating surface in the heating section 2 is respectively packaged with a tube box structure, and a modular design is adopted, which can solve the problem that the furnace tubes 11 and the tail heating surface of the radiation section 1 in the background technology adopt an integral structure. The integrated packaging structure solves the problem of high difficulty in transportation, on-site hoisting and installation, and has the beneficial effect of low difficulty in on-site construction and convenient operation; the segmented arrangement of the furnace tube 11 in the radiation section 1 can also control the flow direction of the working medium in the furnace tube 11 in each segment, interfere with the heat exchange of each segment, and ensure the safe operation of the boiler, wherein the tail heating surface in the heating section 2 is connected with the furnace tube 11 located in the middle of the radiation section 1, so that the working medium in the liquid state of the tail heating surface enters from the middle of the radiation section 1, which can effectively avoid the deterioration of heat transfer in the furnace tube 11. The entire boiler adopts modularization and is easy to install. This boiler structure is very suitable for places with limited floor space, weak lifting capacity, and high boiler evaporation capacity requirements.

[0030] Example 2: Based on Example 1, the furnace tube 11 in the radiation section 1 is optimally designed. The furnace tube 11 in the radiation section 1 is divided into three sections: an upper pipe 12, a middle pipe 13 and a lower pipe 14 according to the combustion load. Adjacent pipes are interconnected through connecting pipes, and the working fluid inlet of the radiation section 1 is arranged at the bottom of the middle pipe 13, and the working fluid outlet is arranged at the top of the lower pipe 14. The middle pipe 13 and the lower pipe 14 exchange working fluid with the rear heating surface. This arrangement can realize the entry and exit of working fluid in the middle pipe 13 and the lower pipe 14 in the radiation section 1, thereby avoiding deterioration of heat transfer in the furnace tube 11.

[0031] Furthermore, the furnace tubes 11 within the radiant section 1 utilize a multi-coil structure, with each section of the furnace tubes 11 extending upward in a spiral. Specifically, multiple coils are wound around each other within the flue 4 of the radiant section 1, extending upward in a spiral. In this embodiment, the coils are double-coiled, with two coils wound around each other to form a double-helix structure. The coils utilize φ60-φ76 smooth tubes. The number of coil joints and the diameter of the tubes can be selected based on the flow rate of the working fluid. The central pipe 13 of each spiral tube is provided with a working fluid inlet and outlet, communicating with the rear heating surface. This forms two working fluid circulation systems, making it easier to control the flow direction of the working fluid. Furthermore, the spiral coil structure absorbs expansion through the coil structure itself, improving boiler safety and preventing deterioration in heat transfer in the furnace tubes 11 within the radiant section 1, which could cause a tube burst.

[0032] Example 3: Based on Example 1, the radiation section 1 is optimally designed. The radiation section 1 has a cylindrical structure, and the side walls of its flue 4 are made of needle-punched aluminum silicate fiber felt and insulation block materials, which can effectively insulate and prevent heat loss. The furnace tubes 11 in the radiation section 1 are stably connected to the side walls of the flue 4 of the radiation section 1 via pipe clamps 15. The pipe clamps 15 are vertically arranged in an "E" shape. The edges of adjacent furnace tubes 11 are sequentially inserted into the two slots of the pipe clamps 15. The fixed ends of the pipe clamps 15 are welded to the side walls of the flue 4. When the boiler is in operation, the furnace tubes 11 expand and fill the slots, ensuring the stability of the connection during operation. The "E"-shaped pipe clamps 15 also improve the utilization rate of individual fixings.

[0033] Example 4: Based on the above examples, the tail heating surface is optimally designed, and the tail heating surface includes a spiral finned tube economizer 21, a light tube economizer 22 and a superheater 23 that are interconnected, wherein the spiral finned tube economizer 21 is provided with 3 groups respectively encapsulated in different tube boxes, and similarly the light tube economizer 22 and the superheater 23 are also encapsulated in different tube boxes, and the devices encapsulated in each group of tube boxes are interconnected through connecting pipes, wherein the working fluid outlet of the light tube economizer 22 and the working fluid inlet of the superheater 23 are respectively connected to the working fluid inlet and working fluid outlet of the radiation section 1, and a loop is formed with the working fluid of the furnace tube 11 of the radiation section 1 through the light tube economizer 22 and the superheater 23, and the liquid working fluid in the light tube economizer 22 first enters the radiation section 1 from the middle pipe 13, and the gaseous working fluid after the liquid working fluid in the radiation section 1 is heated and evaporated is drawn out from the lower pipe 14 into the superheater 23, completing the overall working process of the boiler. The liquid working medium in the bare tube economizer 22 first passes through the middle pipe 13 with strong heat radiation, and then passes through the upper pipe 12 and the lower pipe 14 with weaker heat radiation, which can also help prevent the deterioration of heat transfer in the furnace tube 11.

[0034] Furthermore, the tube boxes of the superheater 23 , the light tube economizer 22 and the spiral fin tube economizer 21 are stacked in sequence from bottom to top via brackets 28 fixed on the inner wall of the flue 4 of the heating section 2 , and the brackets 28 are welded and fixed to the inner wall of the flue 4 .

[0035] Furthermore, the superheater 23 and the light tube economizer 22 are located in the high-temperature section of the heating section 2, and the side walls of the flue 4 in the high-temperature section are filled with lightweight castables to achieve thermal insulation. The spiral fin tube economizer 21 is located in the low-temperature section of the heating section 2, and the side walls of the flue 4 in the low-temperature section are insulated with insulation board materials.

[0036] Example 5: Based on Example 1, a preferred design for the diverting flue 3 is implemented. This flue 3 has a U-shaped structure with an ash discharge port 31 at its bottom. Ash falling downward after combustion is discharged through this port. Its sidewalls are connected by a protective plate 32, which is filled with a lightweight insulating castable to provide insulation and enhance the stability of the boiler bottom. The inlet of the diverting flue 3 is welded to the outlet of the flue 4 of the radiant section 1, and the outlet of the diverting flue 3 is welded to the inlet of the flue 4 of the heated section 2.

[0037] Example 6: Based on Example 1, the installation method of the radiation section 1 and the heating section 2 is optimally designed. The radiation section 1 is arranged in the outer shell 16. The outer shell 16 is a cylindrical structure, and its bottom is welded and fixed to one side of the surface of the support steel frame 6. It is connected to the support steel frame 6 through the support saddle 17 on the circumference of the outer shell 16. The heating section 2 is arranged in the shell 24. The shell 24 is a square cylindrical structure, and its bottom is welded and fixed to the other side of the surface of the support steel frame 6. The outer wall of the shell 24 is welded and fixed to the support steel frame 6 through the connecting frames 25 evenly arranged from top to bottom in the circumference. In this way, the radiation section 1 and the heating section 2 are respectively installed in the outer shell 16 and the shell 24, and the bottom and circumference of the outer shell 16 and the shell 24 are welded and fixed to the support steel frame 6 through connecting parts, maintaining the overall connection stability and the stable and safe operation of the boiler. In addition, this fixing method will not affect the connection and operation of the radiation section 1 and the heating section 2.

[0038] The above embodiments merely represent specific implementation methods of the present application. Although the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the technical concept of the present application, and these modifications and improvements are all within the scope of protection of the present application.

Claims

1. A modular vertical once-through steam injection boiler with coils, comprising a radiant section (1) and a heating section (2), wherein a burner (5) is arranged on the top of the radiant section (1), and the heating section (2) is connected to an outlet flue (26), characterized in that: The radiation section (1) and the heating section (2) are both arranged vertically and connected through a turning flue (3) at the bottom, wherein the furnace tube (11) in the radiation section (1) is arranged in sections from top to bottom, and the rear heating surface in the heating section (2) is respectively encapsulated using a tube box structure; the rear heating surface in the heating section (2) is connected to the furnace tube (11) located in the middle of the radiation section (1) for working medium exchange, thereby forming a pipeline structure for circulating working medium.

2. The modular vertical once-through steam injection boiler with coils according to claim 1, characterized in that: The furnace tube (11) in the radiation section (1) is divided into three sections: an upper tube (12), a middle tube (13) and a lower tube (14). Adjacent tubes are interconnected, and the working medium inlet of the radiation section (1) is arranged at the middle tube (13), and the working medium outlet is arranged at the lower tube (14).

3. A modular vertical once-through steam injection boiler with coils according to claim 1 or claim 2, characterized in that: The furnace tubes (11) in the radiation section (1) adopt a multi-coil structure, and each section of the furnace tubes (11) extends upward in a spiral shape.

4. The modular vertical once-through steam injection boiler with coils according to claim 1, characterized in that: The side walls of the flue (4) of the radiation section (1) are made of needle-punched aluminum silicate fiber felt material and insulation block material; the furnace tube (11) in the radiation section (1) and the side wall of the flue (4) are stably connected by a pipe clamp (15), and the pipe clamp (15) is a vertically arranged "E"-shaped structure, and the edges of adjacent furnace tubes (11) are sequentially clamped into two clamping holes of the pipe clamp (15).

5. A modular vertical once-through steam injection boiler with coils according to claim 1 or claim 2, characterized in that: The tail heating surface comprises a spiral finned tube economizer (21), a light tube economizer (22) and a superheater (23) which are connected to each other, wherein the working medium outlet of the light tube economizer (22) and the working medium inlet of the superheater (23) are respectively connected to the working medium inlet and the working medium outlet of the radiation section (1).

6. The modular vertical once-through steam injection boiler with coils according to claim 5, characterized in that: The superheater (23), the light tube economizer (22) and the spiral fin tube economizer (21) are respectively encapsulated in different tube boxes and stacked in sequence from bottom to top via a bracket (28) fixed on the inner wall of the flue (4) of the heating section (2).

7. The modular vertical once-through steam injection boiler with coils according to claim 6, characterized in that: The superheater (23) and the light tube economizer (22) are located in the high-temperature section of the heating section (2), and the side walls of the flue (4) in the high-temperature section are filled with lightweight castables to achieve thermal insulation. The spiral fin tube economizer (21) is located in the low-temperature section of the heating section (2), and the side walls of the flue (4) in the low-temperature section are insulated with insulation board materials.

8. The modular vertical once-through steam injection boiler with coils according to claim 1, characterized in that: The turning flue (3) is a U-shaped structure, with an ash discharge port (31) provided at the bottom, and its side walls are connected by a guard plate (32), and the interior of the guard plate (32) is filled with a lightweight heat-insulating castable.

9. The modular vertical once-through steam injection boiler with coils according to claim 1, characterized in that: The radiation section (1) is arranged in an outer shell (16). The outer shell (16) is a cylindrical structure, the bottom of which is fixed to one side of the surface of the supporting steel frame (6) and is stably connected to the supporting steel frame (6) through a supporting saddle (17) circumferentially of the outer shell (16).

10. The modular vertical once-through steam injection boiler with coils according to claim 9, characterized in that: The heated section (2) is arranged in a shell (24), which is a square cylindrical structure. The bottom of the shell (24) is fixed to the other side of the surface of the supporting steel frame (6). The outer wall of the shell (24) is fixedly connected to the supporting steel frame (6) through a connecting frame (25) uniformly arranged from top to bottom in the circumferential direction.

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