CN111878794A

CN111878794A - Finned tube type multi-return low-nitrogen condensation fuel gas evaporator

Info

Publication number: CN111878794A
Application number: CN202010918295.6A
Authority: CN
Inventors: 刘新续
Original assignee: Anaki Shanghai Energy Science And Technology Ltd
Current assignee: Anaki Shanghai Energy Science And Technology Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2020-11-03

Abstract

The invention discloses a fin tube type multi-return low-nitrogen condensation gas evaporator which comprises a cavity limiting part, wherein a combustion chamber and a plurality of flue gas chambers are limited in the cavity limiting part through partition plates, the flue gas chambers are separated by the partition plates, flue gas sequentially flows through the flue gas chambers in one direction, a multi-return fin tube type structure penetrating through the flue gas chambers is arranged in the cavity limiting part, the combustion chamber is arranged at the starting end of the multi-return flue gas chamber, a combustor is arranged in the combustion chamber, a smoke exhaust pipe is arranged at the tail end of the multi-return flue gas chamber, and a smoke exhaust condensate pipe is arranged in the multi-return flue gas chamber. The invention adopts a premixing combustion mode, so that the equipment operation is more stable, and the emission of nitrogen oxides can be effectively reduced; the multi-return-stroke structure is adopted, so that the service life is greatly prolonged while the cost is reduced, low-nitrogen condensation is realized by the multi-return-stroke fin tube structure of the plurality of flue gas chambers, the problems of stability and safety of the evaporator are solved, and the energy efficiency of the evaporator is greatly improved.

Description

Finned tube type multi-return low-nitrogen condensation fuel gas evaporator

Technical Field

The invention relates to the technical field of fuel gas steam generation, in particular to a finned tube type multi-return low-nitrogen condensation fuel gas evaporator.

Background

Chinese patent invention cn201510403595.x discloses a gas steam generating device. It includes two at least steam units, and every steam unit includes combustion chamber, fire row and two at least heat exchangers, the fire is arranged and is located the heat exchanger below, a heat exchanger in same steam unit is equipped with cold water inlet, and another heat exchanger is equipped with steam outlet, the heat exchanger in each steam unit all establishes ties in proper order between the heat exchanger that is equipped with cold water inlet and the heat exchanger that is equipped with steam outlet. Therefore, the temperature difference of the heat exchangers in the same steam unit is large, and the two heat exchangers are easy to exchange heat, so that the heat exchangers with low temperature can fully recycle the heat energy of the fuel gas in the combustion chamber, the heat exchangers with low temperature can be effectively preheated in the combustion chamber, and the heat exchangers with low temperature in each combustion chamber can be effectively preheated, thereby improving the steam temperature and the steam generation speed of the steam boiler. The disadvantages of this device are:

1) the steam units are independent units, each independent unit is provided with a combustor, so that the number of combustors is large, the number of fault points is large, the equipment volume is large, and the production cost is high;

2) the heat exchangers of each steam unit are independently installed, and the heat exchangers of two adjacent steam units are completely connected by using a U shape after installation, so that the problem that the heat exchangers are inconvenient to install is caused, and the problem and hidden danger are caused by more connecting points;

3) the heat exchanger adopts a finned heat exchanger, is horizontally arranged, is not provided with a water level gauge, and is easy to cause dry burning of an evaporator, thereby causing safety problems;

4) the atmospheric fire grate combustor is used, flame burns upwards at the lower part of the combustor, the atmospheric combustion is unstable, the mixing ratio of air and fuel gas cannot be accurately matched, smoke flows upwards and cannot be subjected to condensation combustion at low smoke exhaust temperature, and if condensate water appears at low smoke exhaust temperature, the condensate water can be remained on the combustor, so that the combustor can be flamed out, the fuel gas leaks and other safety problems can be caused;

5) the heat exchange tubes of two adjacent steam units are connected by adopting U-shaped bent tubes, and the upper heat exchange straight tube and the lower heat exchange straight tube of the heat exchanger on the same steam unit are also connected by adopting U-shaped tubes, so that a large pressure resistance can be generated inside, and the heat exchange efficiency is low.

In order to overcome the defects, the publication number CN109373301A discloses a heat exchange unit of a modular steam generating device. The heat exchanger is arranged on the supporting clapboard along the length direction of the shell, the heat exchanger penetrates through each combustion chamber, and the heat exchanger is positioned above the combustor. The support baffle plate divides the inner cavity of the shell into a plurality of combustion chambers, each combustion chamber is provided with the atmospheric fire-exhaust burner, so that the steam output speed is increased, and the steam output is increased. However, the heat exchanger unit of the modular steam generating equipment also has the following disadvantages: a) each gas chamber is provided with an atmospheric fire grate burner, the atmospheric fire grate burner is used, flames are upwards burnt at the lower part of the burner, the atmospheric burning is unstable, the mixing ratio of air and gas cannot be accurately matched, smoke flows upwards, condensation burning with low smoke exhaust temperature cannot be carried out, if the smoke exhaust temperature is low, condensed water can be remained on the burner, and the problems of flameout of the burner, gas leakage and the like caused by the condensed water are solved; b) the heat exchanger is horizontally arranged, and a water level gauge is not arranged, so that the evaporator is easily dried, the safety problem is caused, and the service life of a product is influenced; c) the steam unit is a plurality of units, each unit is provided with a burner, the number of burners is large, the number of fault points is large, the equipment volume is large, and the production cost is high;

disclosure of Invention

The invention aims to solve the technical problems and provides a finned tube type multi-return low-nitrogen condensation fuel gas evaporator.

In order to solve the above technical problem, an embodiment of the present invention provides a finned tube type multi-pass low-nitrogen condensation gas evaporator, including: the multi-return-type flue gas boiler comprises a cavity limiting part consisting of an outer furnace wall, an insulating layer of the furnace wall and an inner furnace wall, wherein a multi-return-type flue gas chamber is limited in the cavity limiting part through a partition plate, a fin tube type structure penetrating through the multi-return-type flue gas chamber is arranged in the cavity limiting part, the inlet of the fin tube is connected with a water supplementing pipe through a water collecting pipe, the outlet of the fin tube type structure is connected with a steam outlet or hot water outlet pipe through a steam/hot water collecting pipe, a burner fan and a burner combustion head are installed in the flue gas chamber at the starting end of the multi-return-type flue gas chamber, a smoke exhaust pipe is installed in the flue gas chamber at the tail end of the multi-return-type flue.

Further, the finned tube structure comprises tubes and fins, and the tubes in the multi-return flue gas chamber are single finned tubes or integral finned tubes.

Furthermore, a water level meter is arranged between the water replenishing pipe and the steam/hot water collecting pipe.

Furthermore, the partition plates in the multi-return-stroke flue gas chamber are distributed in a staggered mode.

Further, the tube of the fin tube type structure is made of stainless steel.

The invention has the following beneficial effects:

(1) the invention adopts a premixing type combustion mode, so that the equipment operation is more stable, and the emission of nitrogen oxides can be effectively reduced.

(2) The invention adopts a multi-return structure, and can replace a heat exchanger unit of the modular steam generating equipment in the background technology by one combustor.

(3) The invention adopts a multi-return structure, can better solve the problem of condensed water, has low smoke discharge temperature, does not have any influence on a burner by the condensed water, does not have the problems of fire extinguishing, fire discharging and the like caused by dripping of the condensed water, avoids potential safety hazards, and greatly prolongs the service life of the whole product.

(4) The invention adopts a finned tube structure, and can greatly improve the heating efficiency.

(5) The structural layout of the invention ensures that the equipment does not worry about the corrosion problem of the condensed water.

(6) The product can be placed in various directions, can be placed horizontally or vertically, and meets the installation and use requirements of multiple occasions.

Drawings

Fig. 1 is a schematic structural diagram of a finned tube type multi-pass low-nitrogen condensation gas evaporator in a first embodiment of the invention.

Fig. 2 is a cross-sectional view taken along line K-K in fig. 1.

Fig. 3 is a schematic view of a single finned tube structure in a second embodiment of the invention.

FIG. 4 is a view showing an effect of an arrangement of the hairpin finned tubes in the third embodiment of the invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

A first embodiment of the present invention provides a finned tube multi-pass low nitrogen condensate gas evaporator, see fig. 1, comprising: the device comprises a combustor fan 1, a combustor combustion head 2, a water pipe or steam pipe 3, fins 4, a steam or hot water collecting pipe 5, a steam or hot water outlet pipe 6, a water supplementing pipe 7, a smoke exhaust condensed water pipe 8, a water collecting pipe 9, an outer wall 10 of the furnace, a furnace wall heat preservation layer 11, an inner wall 12 of the furnace, a smoke exhaust pipe 13, a furnace body base 14 and a water level gauge 15.

For convenience of description, the end partition plate of the flue gas chamber is defined as a top flue gas partition plate E and a bottom flue gas partition plate H, the partition plate in the flue gas chamber is defined as a first partition plate F and a second partition plate G, and the number of the partition plates in the flue gas chamber can be increased according to needs, so that the return quantity of the return type flue gas chamber can be increased.

In fig. 1, the finned tube type multi-pass low-nitrogen condensation gas evaporator comprises a cavity limiting part consisting of an outer furnace wall 10, a furnace wall insulating layer 11 and a furnace inner wall 12, a combustion chamber and a multi-pass flue gas chamber are limited in the cavity limiting part through a partition plate, and the shape of the cavity limiting part comprises but is not limited to a square shape shown in the figure, and can also be any other shapes such as a round shape, an oval shape, a triangular shape and the like. As the product has diversified placement directions, including but limited to vertical placement and horizontal placement, taking the vertical placement as shown in FIG. 1 as an example, a furnace body base 14 can be arranged at the bottom of the cavity limiting part. The cavity limiting part is internally limited with a multi-return-stroke flue gas chamber through a partition board, the number of the partition boards determines the return stroke number of the multi-return-stroke flue gas chamber, the top of the inner cavity of the cavity limiting part is provided with a top flue gas partition board E, the bottom of the inner cavity is provided with a bottom flue gas partition board H, two staggered partition plates are arranged between the top flue gas partition plate and the bottom flue gas partition plate and are respectively defined as a first partition plate F and a second partition plate G, the first partition plate F extends from the inner wall of the left furnace to the inner wall of the right furnace, and the first partition plate F and the inner wall of the right furnace are in a non-connection state, so that a gap is formed between the first clapboard F and the inner wall of the right side furnace, the second clapboard G extends from the inner wall of the right side furnace to the inner wall of the left side furnace, and the second clapboard G and the inner wall of the left furnace are in a non-connection state, so that a gap is formed between the second clapboard G and the inner wall of the left furnace.

As can be seen from fig. 1, a finned tube structure penetrating through the multi-return flue gas chamber is arranged in the cavity limiting portion, and with reference to fig. 2, the finned tube structure includes tubes 3 and fins 4, the number of the tubes 3 is arranged as required, in this embodiment, the number of the tubes 3 is 8, the tubes 3 are arranged in a multi-row structure, the tubes 3 herein sequentially penetrate through the bottom flue gas partition H, the second partition G, the first partition F and the top flue gas partition E from bottom to top, and the tubes 3 in the multi-return flue gas chamber are integral finned tubes, that is, eight tubes 3 penetrate through the fins 4. The entry of finned tube passes through water collecting pipe 9 and connects in moisturizing pipe 7, and the export of fin tubular structure passes through steam/hot water collecting pipe 5 and connects in play vapour or play hot water pipe 6, combustor fan 1 and combustor burner 2 are installed to the initial end flue gas chamber of the formula flue gas chamber that returns more, and combustor fan and burner constitute the combustor, can realize mixing formula burning in advance like this, smoke exhaust pipe 13 is installed to the terminal flue gas chamber of the formula flue gas chamber that returns more, the formula flue gas chamber that returns more installs discharge fume condensate pipe 8. A water level meter 15 is connected between the water supplementing pipe 7 and the steam or hot water collecting pipe 5, and the water level meter 15 can prevent the evaporator from being dried.

In fig. 1, the top flue gas partition E and the first partition F together form a start flue gas chamber, the second partition G and the bottom flue gas partition H form a tail flue gas chamber, and N intermediate flue gas chambers are arranged between the start flue gas chamber and the tail flue gas chamber, since two partitions (i.e., the first partition F and the second partition G) are arranged to separate the multi-pass flue gas chambers in the present embodiment, only one intermediate flue gas chamber is included, in fig. 1, a left area of the start flue gas chamber, in which the tubes 3 are distributed, is defined as a combustion chamber a, a right side of the start flue gas chamber and a right side of the intermediate flue gas chamber adjacent thereto are defined as a first flue gas chamber B, a left side of the intermediate flue gas chamber and a left side of the tail flue gas chamber adjacent thereto are defined as a second flue gas chamber C, and a right side of the tail flue gas chamber is defined as a third flue gas chamber D. The combustion chamber A, the first flue gas chamber B, the second flue gas chamber C, fin and pipe 3 are not distributed in the third flue gas chamber D, premixed gas heats the pipe 3 through the fin after the combustion of the combustion chamber A, the clearance between the fins can allow the flue gas to enter the first flue gas chamber B, then the flue gas enters the second flue gas chamber C through the fin clearance of the middle flue gas chamber, the last flue gas enters the third flue gas chamber D through the fin clearance of the tail end flue gas chamber, thus the condensate water is collected at the bottom of the tail end flue gas chamber, and the occurrence of dangerous situations such as fire extinguishing by pouring the condensate water can be avoided.

In fig. 1, flue gas passes through a combustion chamber a, a first flue gas chamber B, a second flue gas chamber C and a third flue gas chamber D in sequence, the temperature of the flue gas is gradually reduced, and the temperature can be transferred to a pipe 3 through fins.

The tube 3 with the fin tube type structure is made of stainless steel, the tube 3 can be used as a steam tube or a hot water tube maliciously, when the invention is used for generating steam, the tube 3 generating steam is called as the steam tube (at this time, the invention can be called as a fin tube type multi-return low-nitrogen condensation fuel gas steam generator), and when the invention is used for generating hot water, the tube 3 generating hot water is called as the hot water tube (at this time, the invention can be called as a fin tube type multi-return low-nitrogen condensation fuel gas hot water boiler).

In this embodiment, the cavity defining portion formed by the outer wall 10, the insulating layer 11 and the inner wall 12 is square, at this time, the bottom of the cavity defining portion is provided with the furnace body base 14, at this time, the product is vertically installed for use, of course, the product can be horizontally installed for use according to the requirement, at this time, the smoke exhaust gas condensate pipe is arranged at the lower end of the water level of the end smoke chamber.

A second embodiment of the invention provides a finned tube multi-pass low nitrogen condensate gas evaporator which differs from the first embodiment in that the tubes 3 in the multi-pass flue gas chamber are single finned tubes.

In figure 3, a single pipe 3 is shown, the pipe 3 runs through the partition board in the cavity limiting part, so that the pipe 3 is positioned in the flue gas chamber of the cavity limiting part and is heated by the combustion chamber, and the flue gas heats the water in the pipe 3 in a gradient manner by utilizing the multi-return flue gas chamber, wherein each pipe 3 is independently provided with a fin, the fins are distributed on the pipe 3 from bottom to top according to a certain interval, when the plurality of pipes 3 are arranged between the bottom flue gas partition board H and the top flue gas partition board E, the fins of each pipe 3 can be aligned, so that a fin arrangement form similar to that shown in figure 1 is formed, and the fins can also be arranged in a staggered manner.

Compared with the integral finned tube of the first embodiment, N fins are arranged in parallel in the cavity limiting part, and then the tube 3 sequentially passes through the fins, the tube arrangement is more flexible by adopting a single finned tube 16 in the embodiment.

The invention adopts the premixing combustion mode, can efficiently heat the finned tubular structure in the initial-end flue gas chamber, and can reduce the generation of nitrogen oxides, thereby increasing the documents of equipment operation, and greatly prolonging the service life of the product due to the stainless steel finned tubular structure. And when the multiple-return structure solves the problem that a combustor meets the use requirement, the smoke exhaust temperature can be lower, the condensed water is enabled not to influence the combustion action of the fire grate (the combustor burner in the embodiment) of the combustor, and in addition, the appearance of the fin tube structure enables the heat energy to be efficiently and quickly transferred to a water supply pipe or a steam pipe, so that the heating efficiency is more efficient.

The product provided by the invention is suitable for both the industrial field and the civil field, meets the requirements of hot water and steam generation, and has better environment-friendly and energy-saving effects.

A third embodiment of the present invention provides a finned tube multi-pass low nitrogen condensate fuel gas evaporator which differs from the first embodiment in that the finned tubes are in the form of U-shaped finned tubes.

Referring to FIG. 4, the finned tube is shown assembled in a U-shape.

The invention adopts a premixing combustion mode, so that the equipment operation is more stable, and the emission of nitrogen oxides can be effectively reduced; the multi-return-stroke structure is adopted, a heat exchange unit of the modular steam generation equipment in the background technology can be replaced by one combustor, the multi-return-stroke structure is adopted, the low smoke exhaust temperature can be realized, the moisture in the smoke is condensed, the condensation heat is released to heat the water entering the evaporator, and the efficiency of the evaporator is improved; the invention adopts a multi-return-stroke finned tube structure of a plurality of flue gas chambers, realizes low-nitrogen condensation, solves the problems of stability and safety of the evaporator and greatly improves the energy efficiency of the evaporator.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. Many return strokes of fin tubular low nitrogen condensation gas evaporimeter, its characterized in that, it includes: the furnace comprises a furnace outer wall, a furnace wall heat-insulating layer and a furnace inner wall, wherein a combustion chamber and a multi-return-stroke flue gas chamber are limited in the cavity limiting part through partition plates, a plurality of partition plates allowing the flue gas to sequentially pass through the multi-return-stroke flue gas chamber and finned tubes penetrating through the whole cavity of the cavity limiting part are arranged in the cavity limiting part, the finned tubes are composed of fins and tubes, inlets of the finned tubes are connected to a water supplementing pipe through a water collecting pipe, outlets of the finned tubes are connected to a steam outlet pipe through a steam collecting pipe, a combustor combustion head and a combustor fan connected with the combustor combustion head are installed at the initial end of the multi-return-stroke flue gas chamber, a smoke exhaust pipe is installed at the tail end of the multi-return-stroke flue gas chamber, and a smoke exhaust gas condensate pipe is installed in the multi-return-.

2. The finned tube type multi-pass low-nitrogen condensation gas evaporator as claimed in claim 1, wherein a multi-pass flue gas chamber consisting of a combustion chamber and a plurality of flue gas chambers is defined in the cavity limiting portion through a partition plate, and a flue gas chamber inner partition plate allowing flue gas to pass through the multi-pass flue gas chamber in sequence and flue gas chamber end partition plates distributed at two ends of the multi-pass flue gas chamber are arranged in the cavity limiting portion.

3. The finned tube type multi-pass low-nitrogen condensation gas evaporator as claimed in claim 1, wherein the tubes in the multi-pass flue gas chamber are single finned tubes or integral finned tubes, one finned tube penetrates through the whole cavity, the shape of the finned tubes can be square or U-shaped, and the finned tubes are arranged in one row or multiple rows.

4. The finned tube multi-pass low nitrogen condensate gas evaporator of claim 1, further comprising: the water level gauge for preventing the evaporator from being dry-burned is arranged between the water replenishing pipe and the steam collecting pipe.

5. The finned tube type multi-pass low-nitrogen condensate gas evaporator as claimed in claim 1, wherein the partition plates in the multi-pass flue gas chamber are distributed in a staggered manner.

6. The finned tube multi-pass low nitrogen condensate gas evaporator of claim 1, wherein the shape of the finned tube tubes of the finned tube structure is circular or elliptical.

7. The finned tube multi-pass low nitrogen condensate gas evaporator of claim 6, wherein the tubes are made of stainless steel.