CN209978000U - Dryness lifting device for horizontal steam-injection boiler - Google Patents

Abstract

The utility model relates to a horizontal steam injection boiler dryness hoisting device. The technical scheme is as follows: the heat-preserving device comprises a pressure-bearing heat exchange component and a heat-preserving component, and is arranged between the front end of an original convection section shell and the rear end of a radiation section of the horizontal steam-injection boiler; the pressure-bearing heat exchange component comprises an inlet pipe, an outlet pipe, a heat exchange light pipe and a communicating elbow, the heat exchange light pipe penetrates through the side heat insulation layers, the heat absorption section is a heat exchange light pipe section between the side heat insulation layers, and the sealing pressing cover is arranged on the outer heat insulation box and used for sealing exposed pipe sections of the inlet pipe and the outlet pipe and preventing internal smoke from leaking; the upper heat-insulating layer, the lower heat-insulating layer, the outer heat-insulating box and the side heat-insulating layer jointly form a heat-insulating part. The beneficial effects are that: the heat absorption of the high-dryness steam is carried out at the front end of the convection section, so that dust is not easily accumulated on the heat exchange tube, the heat transfer effect is good, and the operation is safer; the steam dryness lifting device absorbs heat in the flue gas again, so that the exhaust gas temperature can be effectively reduced, the overall thermal efficiency of the boiler is improved, and the operating cost of the boiler is effectively reduced.

Description

Dryness lifting device for horizontal steam-injection boiler

Technical Field

The utility model relates to a horizontal steam injection boiler steam quality's technical field, in particular to horizontal steam injection boiler dryness fraction hoisting device.

Background

The utilization rate of injected underground steam is improved, the operation cost of the boiler is effectively reduced, and the high-efficiency steam injection and recovery system is suitable for the higher requirements of novel thick recovery process technologies such as horizontal wells, steam flooding and HDNS on thermal recovery boiler equipment at home and abroad at present. The structure of the conventional horizontal steam injection boiler operated in the oil field always adopts the traditional mode, water is heated through a convection section and then enters a radiation section for heating and vaporization, and the designed dryness of wet steam is generally 80-85%. Along with the increase of the service life of the steam injection boiler, a large amount of dust and scale can be adhered to the convection section light tube and the finned tube, and the dust and scale are extremely difficult to remove, so that the heat transfer effect is poor, the efficiency of the steam injection boiler is reduced, the steam enthalpy value under an injection well is reduced, the steam dryness is far less than the design index and can only reach about 75-78%, and the steam injection efficiency of the boiler is seriously reduced. Meanwhile, the problems of high smoke temperature, increased fuel consumption and waste of a large amount of fuel oil and gas resources are brought. At present, most of super heavy oil reservoirs, deep heavy oil reservoirs and thin heavy oil reservoirs need high-pressure wet steam with dryness of more than 80% to carry out oil displacement operation, so that improvement of the dryness of the existing horizontal steam injection boiler is imperative.

Disclosure of Invention

The utility model aims at solving the defects in the prior art and providing a dryness lifting device for a horizontal steam-injection boiler, wherein the heat absorption of high-dryness steam is carried out at the front end of a convection section, so that dust is not easily accumulated on a heat exchange tube, the heat transfer effect is good, and the operation is safer; the steam dryness lifting device absorbs heat in the flue gas again, so that the exhaust gas temperature can be effectively reduced, the overall thermal efficiency of the boiler is improved, and the operating cost of the boiler is effectively reduced.

The utility model provides a horizontal steam injection boiler quality hoisting device, its technical scheme is: the heat-preserving device comprises a pressure-bearing heat exchange component and a heat-preserving component, and is arranged between the front end of a shell (b) of an original convection section of a horizontal steam-injection boiler (e) and the rear end of a radiation section; the pressure-bearing heat exchange component comprises an inlet pipe (1), an outlet pipe (2), heat exchange light pipes (8) and a communication elbow (9), wherein the heat exchange light pipes (8) penetrate through side heat-insulating layers (7), a heat absorption section is a heat exchange light pipe section between the side heat-insulating layers (7), and a sealing pressing cover (3) is arranged on an outer heat-insulating box (6) and used for sealing exposed pipe sections of the inlet pipe (1) and the outlet pipe (2) and preventing internal smoke from leaking; the upper heat-insulating layer (4), the lower heat-insulating layer (5), the outer heat-insulating box (6) and the side heat-insulating layer (7) jointly form a heat-insulating part.

Preferably, the inlet pipe (1) is connected with one end of the heat exchange light pipe (8), and the heat exchange light pipe (8) and the communication elbow (9) are welded to form a circulating heat exchange channel and are connected with the outlet pipe (2).

Preferably, the heat exchange light pipes (8) are made of 15CrMo alloy steel in multiple rows.

Preferably, the former convection section coil (c) is arranged in the former convection section shell (b).

Preferably, the pressure-bearing heat exchange component and the heat preservation component form a steam dryness lifting device (a), and the right side of the steam dryness lifting device (a) is a radiation section.

The utility model has the advantages that: the utility model discloses a steam quality hoisting device who mentions installs in radiation section rear end, convection current section front end, and the heat transfer at this position is flue gas convection heat transfer. Because the heating surface is added at the front end of the convection heat exchange, the heat flow density of the convection heat exchange flue gas is higher, and the steam dryness can be effectively improved. Although the flue gas heat flow density is larger, the heat flow density is still smaller than that of the radiation section, so that the heat transfer deterioration phenomenon can not occur although the steam dryness is greatly improved. The dryness is improved, and meanwhile, the pressure-bearing pipeline can run safely. Through calculation, the smoke and wind resistance rises by about 1 percent, and the normal operation of a combustion system cannot be influenced within the allowable range of the operation of the boiler; the resistance of the steam-water flow path rises by about 1.2 percent, and the normal operation of the steam-water system cannot be influenced within the allowable range of the original design. The device improves the dryness of wet steam of the original boiler by about 5 percent, and meets the requirement of the prior thick oil exploitation;

the heat absorption of the high-dryness steam is carried out at the front end of the convection section, so that dust is not easily accumulated on the heat exchange tube, the heat transfer effect is good, and the operation is safer; the steam dryness lifting device absorbs heat in the flue gas again, so that the exhaust gas temperature can be effectively reduced, the overall thermal efficiency of the boiler is improved, and the operating cost of the boiler is effectively reduced.

Drawings

FIG. 1 is a schematic view of a partial structure of the present invention;

FIG. 2 is a schematic structural view in a top view direction of the present invention;

in the upper diagram: the steam dryness lifting device comprises a steam dryness lifting device a, an original convection section shell b, an original convection section coil c, flue gas d, a horizontal steam injection boiler e, an inlet pipe 1, an outlet pipe 2, a sealing pressing cover 3, an upper heat insulation layer 4, a lower heat insulation layer 5, an outer heat insulation box 6, a side heat insulation layer 7, a heat exchange light pipe 8 and a communication elbow 9.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Referring to the attached drawings 1-2, the utility model provides a horizontal steam-injection boiler dryness lifting device, which comprises a pressure-bearing heat exchange part and a heat preservation part, and is arranged between the front end of an original convection section shell b and the rear end of a radiation section of a horizontal steam-injection boiler e; the pressure-bearing heat exchange component comprises an inlet pipe 1, an outlet pipe 2, a heat exchange light pipe 8 and a communication elbow 9, wherein the heat exchange light pipe 8 penetrates through the side heat-insulating layers 7, a heat absorption section is a heat exchange light pipe section between the side heat-insulating layers 7, and the sealing pressing cover 3 is arranged on the outer heat-insulating box 6 and used for sealing exposed pipe sections of the inlet pipe 1 and the outlet pipe 2 and preventing internal smoke from leaking; the upper heat-insulating layer 4, the lower heat-insulating layer 5, the outer heat-insulating box 6 and the side heat-insulating layer 7 jointly form a heat-insulating part.

Preferably, the inlet pipe 1 is connected with one end of the heat exchange light pipe 8, and the heat exchange light pipe 8 is welded with the communication elbow 9 to form a circulating heat exchange channel and is connected with the outlet pipe 2.

Preferably, the heat exchange light pipe 8 is made of 3 rows of light pipes and 15CrMo alloy steel.

Preferably, the former convection section coil c is arranged in the former convection section shell b.

Preferably, the pressure-bearing heat exchange component and the heat preservation component form a steam dryness lifting device a, and the right side of the steam dryness lifting device a is a radiation section.

The utility model discloses a steam flow includes following process:

low-dryness steam from the outlet of the radiation section of the horizontal steam injection boiler enters from the inlet pipe 1 and flows out from the outlet pipe 2 through a flow channel formed by welding the heat exchange light pipe 8 and the communication elbow 9. In the process, the heat of the high-temperature flue gas discharged from the combustion chamber of the radiation section is absorbed, so that the low-dryness steam is changed into high-dryness steam, the enthalpy value of the steam is improved, and the steam injection efficiency is improved.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solutions described above. Therefore, any simple modifications or equivalent replacements made according to the technical solution of the present invention belong to the scope of the claimed invention as far as possible.

Claims (5)

1. The utility model provides a horizontal steam injection boiler quality hoisting device which characterized by: the heat-preserving device comprises a pressure-bearing heat exchange component and a heat-preserving component, and is arranged between the front end of a shell (b) of an original convection section of a horizontal steam-injection boiler (e) and the rear end of a radiation section; the pressure-bearing heat exchange component comprises an inlet pipe (1), an outlet pipe (2), heat exchange light pipes (8) and a communication elbow (9), wherein the heat exchange light pipes (8) penetrate through side heat-insulating layers (7), a heat absorption section is a heat exchange light pipe section between the side heat-insulating layers (7), and a sealing pressing cover (3) is arranged on an outer heat-insulating box (6) and used for sealing exposed pipe sections of the inlet pipe (1) and the outlet pipe (2) and preventing internal smoke from leaking; the upper heat-insulating layer (4), the lower heat-insulating layer (5), the outer heat-insulating box (6) and the side heat-insulating layer (7) jointly form a heat-insulating part.

2. The horizontal steam injection boiler dryness improving device according to claim 1, characterized in that: the inlet pipe (1) is connected with one end of the heat exchange light pipe (8), and the heat exchange light pipe (8) is welded with the communication elbow (9) to form a circulating heat exchange channel and is connected with the outlet pipe (2).

3. The horizontal steam injection boiler dryness improving device according to claim 1, characterized in that: the heat exchange light pipes (8) are made of 15CrMo alloy steel in a plurality of rows.

4. The horizontal steam injection boiler dryness improving device according to claim 1, characterized in that: and an original convection section coil pipe (c) is arranged in the original convection section shell (b).

5. The horizontal steam injection boiler dryness improving device according to claim 1, characterized in that: the pressure-bearing heat exchange component and the heat preservation component form a steam dryness lifting device (a), and the right side of the steam dryness lifting device (a) is a radiation section.

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