Energy-saving and efficiency-improving security device of combustion system for negative pressure heating furnace

Abstract

The utility model discloses an energy-saving and efficiency-improving security device of a combustion system for a negative pressure heating furnace. The device comprises a cylinder body, a flue gas inlet and outlet, a square hole, a square flange, a front bearing plate, a bearing cover, a rear bearing, a valve shaft and a baffle of an electric baffle valve, an electric actuator, a bayonet lock, an upper inspection manhole, a lower inspection manhole, a sealing plate, a water collecting tank, a condensate water collecting and discharging assembly, a lifting lug, a flue gas temperature detector, a flue gas oxygen content detector and a flue gas pressure detector. On-line maintenance and replacement of the chimney baffle valve can be realized without moving the chimney, and the disassembly and assembly work is simple and quick. The water collecting tank is additionally arranged on the inner wall of the cylinder body, so that smoke condensate water is effectively discharged, and corrosion damage of acidic condensate water to the baffle valve and the heating furnace body is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to heating furnace technical field especially relates to a kind of energy-saving and efficiency increasing installation of combustion system for negative pressure heating furnace. BACKGROUND

[0002] In oilfield ground gathering system, heating furnace as the main energy equipment for heating process medium, can long-term safe, stable, efficient operation is of vital importance to oil and gas production process.In actual production, heating furnace is mainly composed of combustion system, heat exchange system and exhaust system, three are mutually influenced, close relationship, the change of each part will cause the fluctuation of other two systems.Through long-term engineering practice in oilfield, it is found that a common, but also often ignored problem, namely negative pressure heating furnace chimney damper valve rust jamming problem.Chimney damper valve not only can reach the effect of optimizing air-fuel ratio by adjusting the air quantity of combustion, improving combustion efficiency, but also can effectively balance the pressure in furnace, stabilize furnace flow field and temperature field, achieve the effect of protecting heating furnace body safety.However, in actual operation, after most negative pressure heating furnaces run for several years, the damper valve in chimney will be jammed due to rust, so that the opening degree cannot be continuously adjusted, which affects the safe and efficient operation of heating furnace.It can be seen that, in the current average service life of heating furnace chimney is usually more than 15 years, and chimney damper valve is jammed and fails in two or three years, and cannot be replaced online, only can be replaced together when replacing chimney, so that negative pressure heating furnace can only work in low efficiency and with safety hazard in the following more than ten years, which not only increases oil production gas consumption, increases enterprise production cost, but also increases pollutant, especially nitrogen oxides and carbon dioxide emission, which will cause great pollution and damage to atmospheric environment for years. CONTENT OF UTILITY MODEL

[0003] The utility model aims at the deficiencies of prior art, provides a kind of energy-saving and efficiency increasing installation of combustion system for negative pressure heating furnace and control method, one aspect aims at guaranteeing that chimney damper valve can be long-term safe normal use, to optimize the operating condition of heating furnace, so that heating furnace can long-term safe efficient operation;Another aspect is to realize the online maintenance or replacement of damper valve when damper valve is jammed or damaged, so as to achieve the goal of guaranteeing normal production of heating furnace.

[0004] The utility model provides a kind of combustion system energy-saving and efficiency-increasing protection device for negative pressure heating furnace, comprising: cylinder, the lower end of the upper and lower ends of the cylinder is equipped with connecting flange, lower end is flue gas import, upper end is flue gas export;A long narrow square hole is opened on the middle part of the cylinder wall, the square hole of cylinder wall is provided with the method flange structure formed by four steel plates, flange connection is passed through between method flange and front bearing plate, front bearing is fixed in the middle of front bearing plate, bearing cover is equipped in front of front bearing, bearing cover and front bearing side wall are opened with snap pin hole, and fixed between bearing cover and front bearing through snap pin;Round hole is opened on the cylinder wall of the opposite side of square hole, rear bearing is welded outside circular hole, valve shaft and baffle of electric damper valve are fixedly connected, rear end of valve shaft is inserted into rear bearing, front section of valve shaft and electric actuator are fixed, the area between front bearing and bearing cover of valve shaft is opened with snap pin hole, and the displacement of valve shaft in horizontal direction is limited by installing snap pin;Upper maintenance manhole is welded on the upper part of the cylinder wall of the cylinder, and upper maintenance manhole end is connected by flange and upper maintenance hole sealing plate;Water collecting tank is provided in the upper of upper maintenance manhole along the inside of cylinder wall and is inclined to rear and lower, and the lowest part of water collecting tank is opened with drain hole, condensate water collecting pipe is welded on the cylinder wall around drain hole, reducing pipe is welded behind condensate water collecting pipe, and condensate water drain pipe with smaller pipe diameter is welded below reducing pipe;Lower maintenance manhole is welded on the lower part of the cylinder wall of the cylinder, and lower maintenance manhole end is connected by flange and lower maintenance hole sealing plate;Lug is equipped on the both sides of upper maintenance manhole on the cylinder wall, and smoke temperature detector is equipped below lug on the cylinder wall;Smoke gas oxygen content detector and flue gas pressure detector are respectively installed on the both sides of lower maintenance manhole on the cylinder wall.

[0005] Further, the square hole of cylinder wall is welded with the method flange structure formed by four steel plates.

[0006] Further, valve shaft and baffle of electric damper valve are fixedly connected by welding or snap pin.

[0007] Further, front section of valve shaft and electric actuator are fixed by thread or snap pin.

[0008] The utility model has the advantages that the utility model discloses a kind of combustion system energy-saving and efficiency-increasing protection device for negative pressure heating furnace, without moving chimney, the online maintenance and replacement of chimney baffle valve can be realized, the workload of dismounting is small, simple and fast, and the normal production of heating furnace is not affected;Water collecting tank is additionally provided on the inner wall of cylinder in the utility model, effectively discharges flue gas condensate water, and corrosion damage of acidic condensate water to baffle valve and heating furnace body is avoided.

[0009] Illustration: 1-cylinder; 2-smoke outlet; 3-upper manhole cover; 4-electric actuator; 5-front bearing plate; 6-lower manhole cover; 7-smoke inlet; 8-oxygen content detector of flue gas; 9-condensate water drain pipe; 10-reducing pipe; 11-condensate water collecting pipe; 12-lifting lug; 13-smoke temperature detector; 14-smoke pressure detector; 15-rear bearing; 16-baffle; 17-valve shaft; 18-bearing cover; 19-water collecting tank; 20-clip pin. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the front view of the energy-saving and efficiency-increasing installation for the combustion system of the negative pressure heating furnace of the utility model;

[0011] Figure 2 It is the right view of the energy-saving and efficiency-increasing installation for the combustion system of the negative pressure heating furnace of the utility model;

[0012] Figure 3 It is the left view of the energy-saving and efficiency-increasing installation for the combustion system of the negative pressure heating furnace of the utility model;

[0013] Figure 4 It is the A-A direction sectional view of the utility model; Figure 3

[0014] Figure 5 It is the plan view of the energy-saving and efficiency-increasing installation for the combustion system of the negative pressure heating furnace of the utility model;

[0015] Figure 6 It is the B-B direction sectional view of the utility model; Figure 1

[0016] Figure 7 It is the three-dimensional schematic view of one perspective of the energy-saving and efficiency-increasing installation for the combustion system of the negative pressure heating furnace of the utility model;

[0017] Figure 8 It is the three-dimensional schematic view of another perspective of the energy-saving and efficiency-increasing installation for the combustion system of the negative pressure heating furnace of the utility model;

[0018] Figure 9 It is the field installation schematic view of the energy-saving and efficiency-increasing installation for the combustion system of the negative pressure heating furnace of the utility model. DETAILED DESCRIPTION

[0019] The following non-limiting examples can make those skilled in the art more fully understand the utility model, but do not limit the utility model in any way, it is necessary to point out that the following examples cannot be understood as the limitation of the protection scope of the utility model, if the skilled person in the art makes some non-essential improvements and adjustments to the utility model according to the above utility model content, still belongs to the protection scope of the utility model. ​​

[0020] Please combine Figures 1 to 9 The utility model provides a kind of energy-saving and efficiency-increasing installation of combustion system for negative pressure heating furnace, comprising: cylinder 1, both ends of cylinder 1 are equipped with connecting flange, lower end is flue gas inlet 7, upper end is flue gas outlet 2;A long narrow square hole is opened on the middle cylinder wall of cylinder 1, and the square hole of cylinder wall is welded with the flange structure formed by four steel plates, the flange and front bearing plate 5 are connected, and front bearing plate 5 is fixed with front bearing in the middle, front bearing is equipped with bearing cover 18 in front, bearing cover 18 and the upper side wall of front bearing are equipped with snap pin hole, and bearing cover 18 and front bearing are fixed by snap pin 20;Round hole is opened on the cylinder wall opposite to square hole, and rear bearing 15 is welded outside round hole, valve shaft 17 and baffle 16 of electric baffle valve are fixedly connected by welding or snap pin, rear end of valve shaft 17 penetrates into rear bearing 15, and front section of valve shaft 17 is fixed with electric actuator 4 by screw thread or snap pin, and the area between front bearing and bearing cover 18 of valve shaft 17 is equipped with snap pin hole, and the displacement of valve shaft 17 in horizontal direction is limited by installing snap pin 20;Cylinder wall on the upper part of cylinder 1 is welded with upper manhole, and upper manhole end is connected by flange and upper manhole sealing plate 3;Water collecting tank 19 is arranged on the upper side of upper manhole along cylinder wall and is inclined to rear and lower, and the lowest part of water collecting tank 19 is equipped with drain hole, and drain hole is welded with condensate water collecting pipe 11 on the cylinder wall around, condensate water collecting pipe 11 is welded with reducing pipe 10 behind, and reducing pipe 10 is welded with condensate water drain pipe 9 of smaller pipe diameter below;Cylinder wall on the lower part of cylinder is welded with lower manhole, and lower manhole end is connected by flange and lower manhole sealing plate 6;Lifting lug 12 is arranged on the cylinder wall and located on both sides of upper manhole, and smoke temperature detector 13 is arranged below lifting lug 12 on the cylinder wall;Smoke gas oxygen content detector 8 and smoke gas pressure detector 14 are respectively installed on the cylinder wall and located on both sides of lower manhole.

[0021] The product is installed between the heating furnace and the chimney, and the flue gas of the heating furnace is introduced into the cylinder 1 through the flue gas inlet 7, first contacts the flue gas oxygen content detector 8 and the flue gas pressure detector 14 at the lower part of the cylinder 1, obtains the oxygen content and the flue gas pressure data, then passes through the baffle 16 upwards, contacts the flue gas temperature detector 13, obtains the flue gas temperature data, finally passes through the outside of the water collecting tank 19 and is discharged to the chimney through the flue gas outlet 2, and finally is discharged to the atmosphere through the chimney.

[0022] In summary, the energy-saving and efficiency-increasing protection device for the combustion system of the negative pressure heating furnace realizes the flange connection between the baffle valve and the chimney, ensures that the baffle valve can be conveniently disassembled, maintained and replaced, and effectively improves the use efficiency of the baffle valve; the energy-saving and efficiency-increasing protection device for the combustion system of the negative pressure heating furnace adopts the electric adjustment form of the baffle valve, improves the operation safety of the heating furnace; the energy-saving and efficiency-increasing protection device for the combustion system of the negative pressure heating furnace integrates the flue gas oxygen content detector, the flue gas temperature detector and the pressure detector, realizes the joint and accurate control of the baffle valve by the oxygen content, the flue gas temperature, the flue gas pressure and the fuel gas amount; the energy-saving and efficiency-increasing protection device for the combustion system of the negative pressure heating furnace adds the water collecting tank and the matched drainage system on the inner wall of the cylinder, effectively intercepts and discharges the flue gas condensate generated in the flue gas discharge process, avoids the corrosion and damage of the baffle valve by the condensate, and prolongs the service life of the baffle valve; the energy-saving and efficiency-increasing protection device for the combustion system of the negative pressure heating furnace has a simple overall structure, is designed in an integrated pry manner, and all external interfaces adopt the flange connection mode, so that transportation and installation are facilitated. In addition, the structure or similar structures can be integrated on the heating furnace body or the chimney body, as a new type of heating furnace or a new type of chimney, to achieve the same effect.

[0023] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0024] The preferred embodiments of the present application have been described above with the aid of drawing provided only by way of example and therefore changes in form and detail can be made therein without departing from the spirit and scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A negative pressure heating furnace combustion system energy saving and efficiency increasing installation, characterized in that, It includes: The barrel (1), the connecting flange is installed on both ends of the barrel (1), the lower end is the flue gas inlet (7), and the upper end is the flue gas outlet (2); A long and narrow square hole is formed in the middle of the barrel wall of the barrel (1), a flange structure composed of four steel plates is arranged around the square hole of the barrel wall, the flange is connected with the front bearing plate (5) through the flange, the front bearing plate (5) is fixedly provided with a front bearing in the middle, the front bearing is provided with a bearing cover (18) in front of the front bearing, the bearing cover (18) and the upper side wall of the front bearing are provided with a pin hole, and the bearing cover (18) and the front bearing are fixed through the pin (20); A circular hole is formed in the barrel wall opposite to the square hole, a rear bearing (15) is welded outside the circular hole, a valve shaft (17) and a baffle (16) of the electric baffle valve are fixedly connected, the rear end of the valve shaft (17) penetrates into the rear bearing (15), the front section of the valve shaft (17) is fixed with an electric actuator (4), the valve shaft (17) is provided with a pin hole in the area between the front bearing and the bearing cover (18), and the displacement of the valve shaft (17) in the horizontal direction is limited by installing the pin (20); The upper maintenance manhole is welded on the barrel wall of the upper part of the barrel (1), and the upper maintenance manhole is connected with the upper maintenance hole sealing plate (3) through the flange; A water collecting groove (19) inclined downward is arranged above the upper maintenance manhole along the inner side of the barrel wall, a drainage hole is formed at the lowest part of the water collecting groove (19), a condensate water collecting pipe (11) is welded on the barrel wall around the drainage hole, a reducing pipe (10) is welded behind the condensate water collecting pipe (11), and a condensate water drainage pipe (9) with a smaller diameter is welded below the reducing pipe (10); The lower maintenance manhole is welded on the barrel wall of the lower part of the barrel, and the lower maintenance manhole is connected with the lower maintenance hole sealing plate (6) through the flange; The lifting lugs (12) are arranged on the barrel wall on both sides of the upper maintenance manhole, and the smoke temperature detector (13) is arranged below the lifting lug (12) on the barrel wall; The flue gas oxygen content detector (8) and the flue gas pressure detector (14) are respectively arranged on both sides of the lower maintenance manhole on the barrel wall.

2. The energy-saving and efficiency-improving installation for combustion system of a negative pressure heating furnace according to claim 1, characterized in that, The flange structure composed of four steel plates is welded around the square hole of the barrel wall.

3. The energy-saving and efficiency-improving installation for combustion system of a negative pressure heating furnace according to claim 1, characterized in that, The valve shaft (17) and the baffle (16) of the electric baffle valve are fixedly connected through welding or pin.

4. The energy-saving and efficiency-improving installation for combustion system of a negative pressure heating furnace according to claim 1, characterized in that, The front section of the valve shaft (17) and the electric actuator (4) are fixed through threads or pins.

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