CN1034762C - Hot water boiler with natural circulation - Google Patents
Hot water boiler with natural circulation Download PDFInfo
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- CN1034762C CN1034762C CN87107153A CN87107153A CN1034762C CN 1034762 C CN1034762 C CN 1034762C CN 87107153 A CN87107153 A CN 87107153A CN 87107153 A CN87107153 A CN 87107153A CN 1034762 C CN1034762 C CN 1034762C
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Abstract
The present invention provides an improved water pipe type hot water boiler with natural circulation. The present invention makes use of a trapezoidal convection tube bundle to equalize smoke speed in flues so as to strengthen an automatic dust blowing function for strengthening heat transfer; the internal resistance of a balance boiler of a throttle tube can be adopted to avoid thermal deviation; a cross flow mode can be adopted for water and smoke so as to reduce dew point corrosion and improve the utilization efficiency of the boiler; heat efficiency can be improved by reducing the water-cooling degree of a hearth and increasing the height of the hearth so as to make coal burnt sufficiently; gravity dust removal is adopted to relieve atmospheric pollution; a convection tube is arranged transversely so as to enlarge horizontal pitch length, and the convection tube is favorable for natural ventilation; a parallel circulation loop is adopted in the boiler, so that water circulation is safe and reliable. The hot water boiler with natural circulation, which is provided by the present invention is suitable for a water heating system.
Description
The present invention relates to a kind of improved, to the water tube natural circulating water boiler of heating equipment heat supply.Hot-water boiler provided by the invention is applicable to hot water and superheated water heating system, is specially adapted to the Natural Circulation water-heating system.
Present waterpipe type hot-water boiler generally adopts forced circulation.
Two kinds of forced circulation water-tube boiler structures of " high-temperature water heat supply and heating " the one combustion enginnering book introduction, the U.S. company by: the side water-cooling wall of burner hearth is made up of a large amount of horizontal pipes, and current keep flowing towards the top by these horizontal tubes.Convection heating surface is the top that is positioned on radiant heat zone mostly, take flue gas and stove water forward the type of flow can significantly reduce because of using the caused corrosion of high-sulfur combustor.
Domestic waterpipe type hot-water boiler generally adopts forced circulation, force ventilation, flue gas and the reverse flow of stove hydromining." QXW120-7/95-AI " type boiler that Chinese holly boiler factory, Beijing produces is exactly forced circulation, with the high waterpipe type hot-water boilers of mechanization degree such as air blast, air-introduced machine ventilation, design thermal efficiency 74.15%." QXG60-8/130-A " type boiler that Shenyang Boiler Factory that " Industrial Boiler product sample " introduced produces also is forced circulation, ventilates, burns 58 meters of II class bituminous coal, heating surface areas with air blast, air-introduced machine
2The waterpipe type hot-water boiler, the thermal efficiency is not quite clear." RSG20-4/95-A " type hot-water boiler that Guo Yunfei work " hot-water boiler " book is introduced belongs to the waterpipe type hot-water boiler of pressure (or nature) circulation, 18.62 meters of heating surface areas
2, the thermal efficiency is not quite clear.More than the flue gas and the stove water of three kinds of boilers all adopt the reverse flow mode, the shortcoming of this mode is that back-end surfaces is easy to generate low-temperature dew point corrosion, when heating system adopts Natural Circulation corrosion even more serious, influence the safe operation and the service life of boiler.
The objective of the invention is
The local Natural Circulation water-heating system of variable electricity provides a kind of improved, hot water boiler with natural circulation that can reduce low-temperature dew point corrosion.
Task of the present invention is finished as follows: the trapezoidal tube bank of array is arranged in the back of burner hearth as convection heating surface; With upper and lower two collection casees of crossing equal diameters and throttle pipe, cross crosslinking box radiation heating-surface and convection heating surface are connected in parallel together, form a whole type of furnace; Flue gas and stove current flowing mode adopt the distributary mode.
Details of the present invention and characteristics will be illustrated more clearly in from the accompanying drawing of the following example.
The front elevation of Fig. 1 hot-water boiler burner hearth
The side view of Fig. 2 hot-water boiler
Fig. 3 is along the profile of C-C line among Fig. 2
Fig. 4 is along the profile of D-D line among Fig. 2
Shown in Figure 1 is the front of the burner hearth of hot-water boiler provided by the invention, i.e. the front of radiation heating-surface.4. radiation heating-surface forms (specification and quantity are calculated by heating power and determined) by the water screen tube of burner hearth both sides.Every pipe is simmered and is become 8 ° bend pipe with horizontal sextant angle, and 5. its upper end is connected in parallel with the vertical upper header that is positioned on the burner hearth center line, and the lower end is connected in parallel with the left and right sides lower collecting box is 3. vertical respectively.5. upper header seals with blank flange with lower collecting box front end 3., the rear end respectively with upper collecting chamber 6., the next part case is 2. vertical is connected.
Shown in Figure 3 is the front of hot-water boiler convection heating surface provided by the invention, and it is arranged in the back of burner hearth.(caloric value of hot-water boiler provided by the invention is 20 * 10 to convection heating surface by 5～7 groups
4In kilocalorie/time, is by 6 groups) trapezoidal convection bank forms (convection tube specification and quantity by heating power calculate determine).Every group of trapezoidal convection bank is by horizontal three (middle one is straight tube, and it is curved that the two ends up and down of the two tubes on both sides curve 60 ° of garden arcs to the centre), and vertical 9～12 (caloric value is 20 * 10
4In kilocalorie/time, is by 9) convection tube and second line of a couplet pipe 10., first line of a couplet pipe is formed by connecting.Be the upper end of convection tube and be connected on the first line of a couplet pipe that the lower end is connected in second line of a couplet pipe in parallel and 10. goes up, and forms trapezoidal convection bank.In each group tube bank, with the flue gas partition wall that extended surface tube forms convection bank is divided into three convection pass (see figure 4)s by twice.The first line of a couplet pipe of every group of trapezoidal convection bank is inclined upwardly 5 °～10 ° and is connected in parallel with upper collecting chamber is 6. vertical, and second line of a couplet pipe is connected in parallel with cross crosslinking box is 9. vertical for 10. downward-sloping 5 °～10 °.First line of a couplet pipe , second line of a couplet pipe rear end are 10. sealed with closure plate.Cross crosslinking box 9. and the next part case (caloric value is 20 * 10 by 4～6 between 2.
4In kilocalorie/time, is by 5) 8. throttle pipe vertically be connected in parallel.
Shown in Figure 2 is the side view of hot-water boiler provided by the invention.From the figure as can be seen: between radiation heating-surface and convection heating surface by the identical upper collecting chamber of two lateral arrangement, diameter 6., the next part case 2. and parallel and a upper collecting chamber 6., next part case cross crosslinking box 2. 9. and and cross crosslinking box 9., the next part case 2. between the throttle pipe of vertical connection 8. radiation heating-surface and convection heating surface are connected in parallel into a whole type of furnace.
The characteristics of hot-water boiler provided by the invention are to have designed trapezoidal convection bank as convection heating surface.Using trapezoidal convection heating surface is convenient to make between the tube bank of flue gas in each convection pass with the flow velocity transversal flow convection tube of 3.4～4.1 meter per seconds and to the tube wall heat release when the design convection heating surface.Because flue gas flow rate just has certain ash effect of boasting greater than 3 meter per seconds, thereby dust stratification is less on the convection heating surface of hot-water boiler of the present invention, heat-transfer effect is better, saves steel.
Second characteristic of hot-water boiler provided by the invention be adopted throttle pipe 8. with cross crosslinking box 9..Adopt throttle pipe 8. can make the mutual balance of the loss of flood peak of radiation heating-surface and convection heating surface with cross crosslinking box technical scheme 9., can prevent effectively because steam and water bursting that thermal deviation caused and the overtemperature of tube wall accident that the waterpower inhomogeneities produces guaranteed the safe and economical boiler operation.
The 3rd characteristics of the present invention are arrangements that interior medium of pot and inner flue gas of the stove adopt cross flow one.I.e. pot water Heated Flow in parallel from bottom to top in pipe, flue gas flow the trapezoidal tube bank of transversal flow and while after by forward direction to the tube wall heat release from burner hearth in that pipe is outer.The distributary arrangement can significantly reduce the dew point corrosion of flue gas, prolonged boiler service life.
The 4th characteristics of the present invention are to arrange less water-cooling wall (radiation heating-surface only account for whole heating surfaces 10%) in the burner hearth, adopt higher burner hearth relative altitude (the ratio H/F value of distance from grate surface to the exhanst gas outlet window center " H " and hearth area " F " is in 1.1～1.2 scopes).Flammable composition abundant after-flame in stove that embodiment not only helps in the flue gas in these stoves also helps burning inferior coal to improve the thermal efficiency of boiler.
The 5th characteristics of the present invention are that the gravity type dust-settling compartment is set.The gravity dust-settling compartment is located between boiler room and the chimney, and this dust-settling compartment space is big, flue gas flow rate low (can be lower than 0.2 meter per second), and flow resistance is little, does not need operating cost, maintenance easily, dust removal efficiency is higher, can alleviate the pollution of boiler smoke to environment.Thereby the gravity type dust-settling compartment is the present invention
The 6th characteristics of the present invention are that pot hydromining is used in the scheme that maintenance is flowed towards the top parallel connection in each heating surface pipe.Pot water keeps flowing towards the top and helps in the water gas and rise naturally and arrange outside stove; The type of flow in parallel can make pot current break-make area big, and flowing velocity is low, and the loss of flood peak is especially little.When the confession of boiler, the motion pressure head that produced by difference in specific gravity when return water temperature is 95～70 ℃ are 3～4 times of the loss of flood peak in the pot, can guarantee pot an interior water circulation reliability and a security.
The 7th characteristics of the present invention be the arrangement mode of the convection tube in the convection pass by transversal flow, in-line arrangement arranges that pitch is with big pitch ratio between pipe
In the broader unobstructed flue gas circulation of interbank formation basal area.It is compact to adopt this technical scheme that convection heating surface is arranged, flue gas resistance is little, is beneficial to the boiler gravity-flow ventilation.
The design thermal efficiency of hot water boiler with natural circulation provided by the invention (is example with " ZXG20-7/95-A " type) is 80.3%, and heating surface area is 11.02 meters
2Compare with domestic hot-water boiler of the same type, design thermal efficiency is higher by 6.15% than " QXW120-7/95-A " type hot-water boiler that Beijing Chinese holly boiler factory produces, heating surface area lacks 41% than " RSG20-4/95-A " type hot-water boiler, lacks 43% than " QXG60-8/130-A " type hot-water boiler.By as can be seen above, hot-water boiler thermal efficiency height provided by the invention, steel quantity consumption is few.When hot-water boiler provided by the invention drove auxiliary devices such as water pump, blower fan and puts into operation without electric energy, net efficiency was than the net efficiency height of other hot-water boiler of the same type.
Claims (3)
1, the water tube natural circulating water boiler who is used for water-heating system, this boiler is made up of radiation heating-surface and convection heating surface two large divisions, and radiation heating-surface is arranged in the front of convection heating surface; 4. radiation heating-surface is made up of the water screen tube of burner hearth both sides, every pipe is simmered and is become 8 ° bend pipe with horizontal sextant angle, its upper end be positioned at the burner hearth center line on 5. vertical being connected in parallel of upper header of vertical layout, the lower end is respectively and 3. vertical being connected in parallel of left and right sides lower collecting box of vertical layout; Feature of the present invention is: 6. vertical connection of upper collecting chamber of the rear end 5. of the upper header on the radiation heating-surface and lateral arrangement, 2. vertical being connected in parallel of next part case of its lower collecting box rear end 3. and lateral arrangement; The front end of first line of a couplet pipe in 5～7 groups of trapezoidal convection banks on the convection heating surface is connected in parallel with upper collecting chamber is 6. vertical, and its second line of a couplet pipe front end 10. is connected in parallel with cross crosslinking box is 9. vertical; Again by 4～6 throttle pipes upper/lower terminal 8. vertically be connected in parallel respectively cross crosslinking box 9., 2. the next part case go up; Connection through aforesaid a plurality of relative positions is connected in parallel together radiation heating-surface and convection heating surface, forms a whole boiler.
2, by the described boiler of claim 1, it is characterized in that: in the trapezoidal convection bank, between 10. horizontal 3 of first line of a couplet pipe , second line of a couplet pipe, the upper end of vertical 9～12 convection tube is connected in parallel on the first line of a couplet pipe of aspect top, the lower end is connected in the second line of a couplet pipe of aspect below in parallel and 10. goes up, and forms one group of trapezoidal convection bank.
3, by claim 1 or 2 described boilers, it is characterized in that: the second line of a couplet pipe gradient 10. of the first line of a couplet pipe of aspect top, aspect below is 5 °～10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87107153A CN1034762C (en) | 1987-10-22 | 1987-10-22 | Hot water boiler with natural circulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87107153A CN1034762C (en) | 1987-10-22 | 1987-10-22 | Hot water boiler with natural circulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1032702A CN1032702A (en) | 1989-05-03 |
| CN1034762C true CN1034762C (en) | 1997-04-30 |
Family
ID=4815994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87107153A Expired - Fee Related CN1034762C (en) | 1987-10-22 | 1987-10-22 | Hot water boiler with natural circulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1034762C (en) |
-
1987
- 1987-10-22 CN CN87107153A patent/CN1034762C/en not_active Expired - Fee Related
Non-Patent Citations (3)
| Title |
|---|
| 工业锅炉 机械工业出版社 1984.1.1 * |
| 工业锅炉 机械工业出版社 1984.1.1;锅炉原理 机械工业出版社 1982.1.1 * |
| 锅炉原理 机械工业出版社 1982.1.1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032702A (en) | 1989-05-03 |
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