CN200972113Y - Horizontal non-valve self-exciting pulsation boiler - Google Patents

Abstract

The utility model discloses a horizontal autoexcitation pulsation boiler without a valve, including a base, a boiler main body which is arranged on the base and a burner which is arranged below the boiler main body, the boiler main body is internally arranged with a hearth, a backflash room and a flue head, the burner extends into the hearth, the backflash room is connected with a front smoke box which is connected with a back smoke box and a chimney by the flue head, the flow distance from an air inlet of a draught fan of the burner to a fuel burner and a flame holder is one fifth to one third of a whole gas channel flow; the sum of the section areas of all the flue heads is 20 percent to 33 percent of the section area of the hearth; the maximal flow areas of the front and back smoke boxes respectively equal to the sum of the flow area of the flue head; the equivalent diameter of the flue head fulfills a relational expression as below: (1) d is less than (1.84 multiplies c) divided by Pi multiplies f, wherein co is the sound velocity, f is the fluid pulsation frequency, the equivalent diameter formula is d equals to four multiplies S and then is divided by C, S is the pipeline section area, C is the pipeline section circumference. The utility model does not need to fulfill the limit of a 10 major diameter, which has a small length diameter ratio, a high burning efficiency, a high pulsation heat transmission efficiency and a small pollution discharge.

Description

Horizontal valveless autoexcitation pulsation boiler

(1) technical field

The utility model relates to a kind of Industrial Boiler, especially a kind of pulsation boiler.

(2) background technology

Pulsation boiler operation principle is based on heat sound switch technology and realizes.So-called heat sound switch technology is exactly to realize the mutual method and apparatus that transforms between heat energy and the acoustic energy under certain condition, and its typical case is represented as valveless pulse combustion device-lining gram (Rijke) pipe.

In the gram pipe be the straight tube of both ends open, as shown in Figure 1.Thermal source is positioned at the place of lower port 1/4 pipe range, can be the heating wire net, also can be flame.Air-flow feeds from diagram pipeline lower surface, can be gravity-flow ventilation, also can be artificial draft.For lining gram Guan Eryan, the side that gas flows into is called cold junction, and the outflow side is called the hot junction.When thermal source and ascending air existed simultaneously, lining gram pipe will send deafening sound and make airflow flowing in the pipe be in the state of vibration, realizes the conversion of heat sound, excited that gas column forms standing wave oscillation in the pipe.The normal mode that forms reacts on flame, forms continual and steady intermittent combustion.And, strengthened the convection heat transfer' heat-transfer by convection effect of this fluid because the stream of ventilating in the pipe forms pulsation stream, promptly form pulsation and conduct heat.

This apparatus structure is very simple, and whole device does not have any moving component, long service life; The required fuel of combustion process all can be realized for the various fuel of gas, liquid, solid; The termination of pulsation diabatic process is very easy to, and need not combustion flame is extinguished, as long as block opening one end, intermittent combustion and pulsation are conducted heat stop, and after recovering both ends open, pulsation can be excited again easily again.For the valveless self-actuated pulse combustion type boiler, only need to place the boiler water jacket that water is housed just can finish the normal operation of pulsation boiler in this device.

As the patent No. is 88208327.9, patent name is the Chinese utility model patent of coal-fired intermittent combustion stove, a kind of coal-fired intermittent combustion stove is disclosed, be made up of flue, shell and shell, it is characterized in that flue is made up of burner hearth, fire grate, air inlet pipe, blast pipe, burner hearth is the cylinder of hollow, fire grate is equipped with in the lower end, join with air inlet pipe, the upper end tracheae that runs in, and be provided with two de-noising chamber devices heavy grey chamber of holding concurrently.The patent No. is 94205613.2 for another example, patent name is a kind of intermittent combustion formula hot water, the Chinese utility model patent of steam miniature boiler, it has a casing, control device is housed on casing and has pore, boiler body is housed in the casing, the air intlet valve chamber, the purging motor chamber, intake muffler and exhaust silencer, pulsating combusting device is housed in boiler body, pulsating combusting device is by the combustion chamber, union tail one end, the tail pipe other end connects the exhaust decoupling device and forms, space between pulsating combusting device and the boiler body constitutes water jacket, whole pulsating combusting device is immersed in the water of water jacket, be beneficial to heat transfer water, this boiler work space-time gas and burning enter the combustion chamber and mix, by spark plug sparking fire fuel, gas fume after burning is discharged outdoor through tail pipe.

Although in the gram pipe be a kind of very desirable pulse combustion device, with regard to engineering is used,, gram pipe in the straight pipe type is applied to just have many inconveniences in the engineering reality because it realizes that intermittent combustion has certain condition, specific as follows:

(1), the restriction of draw ratio.In the gram pipe produce and keep air pulsing by self-oscillation, this autoexcitation is in the heat sound transfer process, overcoming the acoustic energy external losses that acoustic energy internal losses and radiation that friction etc. caused are caused, and amplifies that faint disturbance realizes.For restraining Guan Eryan in the tradition, the mouth of pipe is its main loss item to extraradial acoustic energy.By acoustic theory as can be known, have only the very big pipe of ratio (being draw ratio L/D) numerical value of pipe range L and caliber D just can become maintenance system.According to former Soviet Union scholar La Wushen Bach's research, in order to excite sound to shake in the gram pipe of lining, draw ratio preferably should be 30～50; Usually the documents and materials report thinks that L/D 〉=10 get final product.So big draw ratio restrains the amplification of the tube chamber cross-sectional area of pulsating combusting device in greatly having limited.For example: furnace diameter D=0.6m, the just necessary L 〉=6m of height, and generally such pulsation boiler has only the evaporation capacity of 0.2t/h.

(2), the restriction of frequency characteristic.For restraining Guan Eryan in the tradition, it can be similar to and be considered as one 1/2 wavelength pipe, certain relation is just arranged between the velocity of sound, wavelength and frequency like this.This relation will have a significant impact with manufacturing the design of lining gram pipe, and after taking some measures in the solution the excessive problem of gram pipe draw ratio, it is complicated more that this relation will become, as in design process, not considering this factor, gram pipe intermittent combustion in then can occurring, the situation that the pulsation heat transfer can not realize or effect is relatively poor.Therefore, the frequency characteristic problem of gram pipe in this restriction is commonly called, this problem also are principal elements of gram pipe through engineering approaches in the restriction.

(3), the restriction of noise problem.Theoretically, mouth of pipe two ends (above defined cold junction and the hot junction) acoustic pressure of lining gram pipe should be zero, but then can occur the problem of sound leakage in actual mechanical process, so just produces the problem of noise.This noise is very big for people's auditory system influence, even is regarded as great noise source.Like this, for the civil nature of palsating equipment, industrialized process, noise then becomes the important yoke of its popularization of restriction.

(3) summary of the invention

Big for the draw ratio that overcomes existing pulsation boiler, as to have limited burner tube chamber cross-sectional area, the low deficiency of pulsation heat transfer efficiency, the utility model provides that a kind of not need to satisfy draw ratio be 10 restriction, draw ratio is little, the horizontal valveless autoexcitation pulsation boiler that the pulsation heat transfer efficiency is high.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of horizontal valveless autoexcitation pulsation boiler, comprise base, be installed in the boiler body on the base, the bottom install combustion device of boiler body, boiler body inside is equipped with burner hearth, the chamber of strile-bacing, smoke pipe, described burner stretches in the burner hearth, the described chamber of strile-bacing connects front smoke box through smoke pipe, and front smoke box is smoke box, chimney after smoke pipe connects, and the air inlet of burner is 1/5～1/3 of a whole gas passage flow process to the flow process distance of fuel nozzle and flame holder; Each smoke pipe cross-sectional area summation is 20～30% of a burner hearth cross-sectional area; The maximum valid circulation area of forward and backward smoke box equals the circulation area summation of smoke pipe; The equivalent diameter of smoke pipe satisfies following relational expression (1):

$d<\frac{1.84\&CenterDot;c_o}{\mathrm{\&pi;}\&CenterDot;f}---\left(1\right)$

C wherein _oBe the velocity of sound, f is the fluid pulsation frequency, and the equivalent diameter formula is d=4S/C, and S is the pipeline cross-sectional area, and C is the pipeline section girth.

Further, at the burner air inlet silencing apparatus is set.

Further again, described burner hearth wall is corrugated wall.

Further, the front of forward and backward smoke box is connected with smoke pipe with multi-dimensional spatial structure with the side.

Smoke pipe is one of following special pipe: 1. bellows; 2. screwed pipe; 3. helix tube; 4. interpolation is strengthened the pipe of fin.

In chimney and the smoke box exhaust silencer is set.

Described burner is fuel oil, gas burner.

Operation principle of the present utility model is: burner is the special burner that the pulsation boiler uses that is specifically designed to; The fans entrance of burner is 1/5～1/3 of a whole gas passage flow process to the gas flow process distance of fuel nozzle and flame holder; Burner hearth burning the summation of the flue gas that produces by each smoke pipe cross-sectional area be 20～30% of burner hearth cross-sectional area; The valid circulation area of preceding (back) smoke box equals the summation of each smoke pipe circulation area, as shown in Figure 3.Two smoke pipes shown in the figure are the smoke pipe in flat (paper) face, and smoke pipe is arranged as space structure, and total cross-sectional area of other smoke pipes of this smoke pipe and layout in parallel equates with diagram front smoke box or back smoke box valid circulation area.When current (back) smoke box was irregular volume, when promptly its each cross-sectional area was unequal, getting wherein, the maximum was a references object.Simultaneously, the equivalent diameter of smoke pipe must satisfy the requirement of following (1) acoustic characteristic:

$d<\frac{1.84\&CenterDot;c_o}{\mathrm{\&pi;}\&CenterDot;f}---\left(1\right)$

C wherein _oBe the velocity of sound, f is the fluid pulsation frequency, and the equivalent diameter formula is d=4/SC, and S is the pipeline cross-sectional area, and C is the pipeline section girth.Change existing straight tube burner into multistage varying cross-section long-pending shape, this device can be realized autoexcitation intermittent combustion equally, is 10 restriction but do not need to satisfy draw ratio.

Beneficial effect described in the utility model mainly shows: 1, do not need to satisfy draw ratio and be 10 restriction, draw ratio is little, the efficiency of combustion height, and pulsation heat transfer efficiency height, pollutant emission is little; 2, improve boiler thermal output; 3, excellent noise reduction effect; 4, the ripple frequency modulability is good.

(4) description of drawings

Fig. 1 be in the schematic diagram of gram pipe and acoustic characteristic thereof.

Fig. 2 is horizontal fuel-firing gas-firing pulsation boiler structure schematic diagram.

Fig. 3 is smoke pipe and front and back smoke box cross-section relation schematic diagram.

(5) specific embodiment

Below in conjunction with accompanying drawing the present invention is further described.

With reference to Fig. 2, Fig. 3, a kind of horizontal valveless autoexcitation pulsation boiler, comprise base 1, be installed in the boiler body 2 on the base, the bottom install combustion device 3 of boiler body 2, boiler body inside is equipped with burner hearth 4, the chamber 5 of strile-bacing, smoke pipe 6, described burner 3 stretches in the burner hearth 4, the described chamber 5 of strile-bacing connects front smoke box 7 through smoke pipe 6, front smoke box 7 is smoke box 8 after smoke pipe 6 connects, chimney 9, the air inlet of burner 3 is 1/5～1/3 of a whole gas passage to the flow process distance of fuel nozzle and flame holder, each smoke pipe 6 cross-sectional area summations are 20～30% of burner hearth 4 cross-sectional areas, and the circulation area summation of smoke pipe 6 equals front smoke box 7, the maximum valid circulation area of back smoke box 8; The equivalent diameter of smoke pipe 6 satisfies following relational expression (1):

$d<\frac{1.84\&CenterDot;c_o}{\mathrm{\&pi;}\&CenterDot;f}---\left(1\right)$

C wherein _oBe the velocity of sound, f is the fluid pulsation frequency, and the equivalent diameter formula is d=4S/C (S is the pipeline cross-sectional area, and C is the pipeline section girth).

At burner 3 air inlets silencing apparatus is set.Described burner hearth wall is corrugated wall.The front of forward and backward smoke box is connected with smoke pipe with multi-dimensional spatial structure with the side.Smoke pipe 6 is one of following special pipe: 1. bellows; 2. screwed pipe; 3. helix tube; 4. interpolation is strengthened the pipe of fin.In chimney and the smoke box exhaust silencer is set.Burner 3 can be fuel oil, gas burner.

The specific implementation process of present embodiment is:

Burner is the special special kind firing device that the pulsation boiler uses that is specifically designed to, and the fans entrance that it is characterized in that burner is 1/5～1/3 of a whole gas passage flow process to the gas flow process distance of fuel nozzle and flame holder; Simultaneously, the place is provided with denoising device at air inlet, and this device has and the incorporate characteristics of original burner, do not bring any adjection except that noise reduction, and this burner can be fuel oil, gas burner.

Burner hearth burning the summation of the flue gas that produces by each smoke pipe cross-sectional area be 20～30% of burner hearth cross-sectional area, the wall of burner hearth is corrugated or other similar shapes simultaneously, effect with thermal stress resistance, prevent promptly that burner hearth is subjected to behind the high temperature because the effect of expanding with heat and contract with cold, it is deformed even damage.

The valid circulation area of preceding (back) smoke box equals the summation of each smoke pipe circulation area, as shown in Figure 3.Double-head arrow direction among Fig. 3 refers to valid circulation area.Two smoke pipes shown in the figure are the smoke pipe in flat (paper) face, and smoke pipe is arranged as space structure, and total cross-sectional area of other smoke pipes of this smoke pipe and layout in parallel equates with diagram front smoke box or back smoke box valid circulation area.When current (back) smoke box was irregular volume, when promptly its each cross-sectional area was unequal, getting wherein, the maximum was a references object.Simultaneously, the equivalent diameter of smoke pipe must satisfy the requirement of following acoustic characteristic:

$d<\frac{1.84\&CenterDot;c_o}{\mathrm{\&pi;}\&CenterDot;f}---\left(1\right)$

Wherein, c _oBe the velocity of sound, f is the fluid pulsation frequency, and the equivalent diameter formula is d=4S/C (S is the pipeline cross-sectional area, and C is the pipeline section girth).Satisfying under the prerequisite that as above requires, be made as special pipe such as bellows, screwed pipe, helix tube and in pipe, insert things such as strengthening fin smoke pipe is tubular, making its effect, under equal-wattage and operating condition, improving boiler thermal output with augmentation of heat transfer.

According to mouth of pipe effect principle, the noise elimination noise reduction device is set in chimney and smoke box, and makes itself and chimney smoke box integrated, under the situation that realizes noise elimination noise reduction, the pulsation boiler is not caused other negative effects.

Other devices, similar as boiler water jacket, the chamber of strile-bacing etc. with conventional boiler, guarantee that the boiler normal operation gets final product.This horizontal fuel-firing gas-firing pulsation boiler working condition brief introduction is as follows:

Required water will be added in the boiler body (water jacket), start burner, the burner blower fan is sent into air, petrolift extracts combustion gas or fuel oil, after this two mixing, nozzle is with the air-fuel mixture ejection that mixes, lighted by igniter, near flame holder, finish efficient burning, encourage working medium vibration in the gas passage simultaneously, realize conversion of heat sound and intermittent combustion, high-temperature flue gas arrives smoke pipe through the chamber of strile-bacing, the convection heat transfer' heat-transfer by convection of pulsation stream takes place at the smoke pipe place, and with the violent heat transfer effect of water generation in the boiler body, the low-temperature flue gas after the heat exchange is discharged by chimney.

For conventional boiler, its combustion intensity is low, and heat-transfer effect is poor, and volume is bigger, and waste-heat rejection and amount of nitrogen oxides are higher.Present embodiment has been inherited numerous advantages of valveless self-actuated pulse combustion technology, has overcome simultaneously the deficiency of original straight tube Rieke type burner again, with conventional boiler relatively, smaller volume not only, exhaust gas heat loss's amount of nitrogen oxides of becoming estranged obviously reduces.

Claims (7)

1, a kind of horizontal valveless autoexcitation pulsation boiler, comprise base, be installed in the boiler body on the base, the bottom install combustion device of boiler body, boiler body inside is equipped with burner hearth, the chamber of strile-bacing, smoke pipe, described burner stretches in the burner hearth, the described chamber of strile-bacing connects front smoke box through smoke pipe, and front smoke box is smoke box, chimney after smoke pipe connects, and it is characterized in that: the air inlet of burner is 1/5～1/3 of whole gas passage flow process to the flow process distance of fuel nozzle and flame holder; Each smoke pipe cross-sectional area summation is 20～30% of a burner hearth cross-sectional area; The maximum valid circulation area of forward and backward smoke box equals the circulation area summation of smoke pipe; The equivalent diameter of smoke pipe satisfies following relational expression (1):

$d<\frac{1.84\&CenterDot;c_o}{\mathrm{\&pi;}\&CenterDot;f}...\left(1\right)$

C wherein _oBe the velocity of sound, f is the fluid pulsation frequency, and the equivalent diameter formula is d=4S/C, and S is the pipeline cross-sectional area, and C is the pipeline section girth.

2, horizontal valveless autoexcitation pulsation boiler as claimed in claim 1 is characterized in that: at the burner air inlet silencing apparatus is set.

3, horizontal valveless autoexcitation pulsation boiler as claimed in claim 2, it is characterized in that: described burner hearth wall is corrugated wall.

4, as the described horizontal valveless autoexcitation pulsation boiler of one of claim 1-3, it is characterized in that: the front of forward and backward smoke box is connected with smoke pipe with multi-dimensional spatial structure with the side.

5, horizontal valveless autoexcitation pulsation boiler as claimed in claim 4, it is characterized in that: smoke pipe is one of following special pipe: 1. bellows; 2. screwed pipe; 3. helix tube; 4. interpolation is strengthened the pipe of fin.

6, horizontal valveless autoexcitation pulsation boiler as claimed in claim 2 is characterized in that: in chimney and the smoke box exhaust silencer is set.

7, horizontal valveless autoexcitation pulsation boiler as claimed in claim 1, it is characterized in that: described burner can be fuel oil, gas burner.

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