CN203442811U - Device for expanding coal types applicable to small and medium size industrial pulverized coal boilers - Google Patents
Device for expanding coal types applicable to small and medium size industrial pulverized coal boilers Download PDFInfo
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- CN203442811U CN203442811U CN201320366781.7U CN201320366781U CN203442811U CN 203442811 U CN203442811 U CN 203442811U CN 201320366781 U CN201320366781 U CN 201320366781U CN 203442811 U CN203442811 U CN 203442811U
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Abstract
The utility model discloses a combustion device, and particularly discloses a device for expanding coal types applicable to small and medium size industrial pulverized coal boilers. The device comprises a turbulent burner. A central conveying pipe, a central air channel, a primary air powder channel and a secondary air pipe are sequentially arranged at the position of a nozzle in the turbulent burner from interior to exterior. The secondary air pipe comprises an inner secondary air channel and an outer secondary air channel, wherein the inner secondary air channel is located on the inner side of the outer secondary air channel. An outer-ring nozzle is arranged inside the outer secondary air channel. A gas nozzle with double layers and double directions is arranged at the outlet end of the central conveying pipe. The gas nozzle comprises a forward-direction nozzle and an external-direction nozzle, wherein the forward-direction nozzle is arranged on the inner layer, is consistent with the central axis in direction and sprays forwards, and the external-direction nozzle is arranged on the outer layer, forms the 45-60-degree angle with the central axis and sprays in an annular mode. According to the device for expanding the coal types applicable to the small and medium size industrial pulverized coal boilers, the problems that the applicability of the small and medium size industrial pulverized coal boiler coal types is poor, and the NOx content of exhaust gas is high are solved, and mixed combustion of pulverized coal and liquefied petroleum gas under the turbulent flow state is achieved.
Description
Technical field
The utility model relates to a kind of burner, particularly relates to a kind of device of expanding the applicable coal of small and medium-sized industrial coal powder boilers.
Background technology
580,000 left and right of the existing Industrial Boiler of China, and to be often close on the speed increment of more than 7000, approximately 600,000,000 tons of year coal consumptions, total energy consumption and disposal of pollutants all occupy the whole nation second.In the coal-burned industrial boiler of China, 20 tons of following middle-size and small-size major parts that account for.Small and medium-sized industrial coal powder boilers because of its combustion space little, fractional cold high, can only use low ash, high-volatile, high-quality bituminous coal and the brown coal of high heating value, seriously restricting applying of small and medium-sized industrial coal powder boilers technology, and because low NOx combusting technology is controlled the reaction condition of NOx generation and guarantees that the technical conditions of the abundant after-flame of coal dust are conflicting, make the difficult problem in order to be difficult for overcoming that is controlled to of small and medium-sized industrial coal powder boilers NOx discharge capacity, therefore, when the coal-burned industrial boiler transformation of various places, select gas fired-boiler to have more intense tendentiousness, because gas price is relatively high, resource distribution is not extensive, especially away from big and medium-sized cities and the region that produces gas industry enterprise, not only operating cost is high to select gas fired-boiler, or even infeasible.
Utility model content
For solving the problem that small and medium-sized industrial coal powder boilers coal adaptive capacity is poor and flue gas NOx content is higher, the utility model provide a kind of under eddy flow state coal dust and the expansion small and medium-sized industrial coal powder boilers of liquefied petroleum gas multifuel combustion be suitable for the device of coal.
A kind of device of expanding the applicable coal of small and medium-sized industrial coal powder boilers of the present utility model, comprise turbulent burner, nozzle at turbulent burner is furnished with center carrier pipe from inside to outside successively, center wind duct, primary wind and powder passage, secondary air channel, described secondary air channel comprises that inner second air passage and outer second air passage and inner second air passage are positioned at the inner side of outer second air passage, the centre wind of described center carrier pipe output, wind of primary wind and powder passage output and the outer second air of outer second air road output are single flow, the inner second air of described inner second air passage output is strong eddy flow, in described outer second air passage, be furnished with outer shroud nozzle, the described center carrier pipe port of export is provided with has double-layer double-direction gas nozzle, described gas nozzle comprises and is arranged on internal layer forward direction spout consistent with central axial direction and that spray forward, and be arranged on and outer become 45 ~ 60 to spend angles with central axis, and the export-oriented spout spraying with circular pattern.
The wind speed of described center carrier pipe is that the wind speed of 10 ~ 15m/s, primary wind and powder passage is that the wind speed of 15 ~ 20m/s, inner second air passage is that the wind speed of 20 ~ 28m/s, outer second air passage is 25 ~ 35m/s.
The center air quantity of described center carrier pipe output is 2 ~ 3% of burner total blast volume, and the primary air flow of primary wind and powder passage output is 8 ~ 20% of burner total blast volume, and secondary air channel is 67 ~ 90% of burner total blast volume.
The wind of described inner second air passage, the output of the outer second air road separately ratio of secondary air channel total blast volume is: 55 ~ 65% and 45 ~ 35%.
Expand a method for the applicable coal of small and medium-sized industrial coal powder boilers, adopt the swirl flow combustion mode of air stage feeding, realize as follows:
(1) in the central area of turbulent burner front end, introduce first order liquefied petroleum gas, formation center torch, described first order oil liquefied gas is provided by the export-oriented spout of gas nozzle, improve catching fire and burning condition of coal dust, stablize pulverized coal flame, control primary combustion zone atmosphere simultaneously, suppress the generation of NOx;
(2) second level oil liquefied gas is provided jointly by the forward direction spout of gas nozzle and the outer shroud nozzle that is furnished with in outer second air passage, second level oil liquefied gas is passed to primary combustion zone in the mode of high velocity stream thigh, send into and take carbon element burning as main primary combustion zone afterbody and the zone line of intermediate zone, in this region, form stronger reducing atmosphere, CHi, the HCN, NHi, the CO group that utilize second level oil liquefied gas generated by thermal cracking and low oxygen combustion, the reduced zone of expansion high-temperature flue gas, the NOx generating in reduction primary combustion zone;
(3) after the NOx effect generating in second level oil liquefied gas reduction primary combustion zone, along with burner outer second air continue sneak into, unburned completely second level oil liquefied gas combustion product and coal dust burns away, and realizes the abundant after-flame of coal dust.
The center wind speed of described burner nozzle is that 10 ~ 15m/s, primary air velocity are that 15 ~ 20m/s, inner second air speed are that 20 ~ 28m/s, outer second air speed are 25 ~ 35m/s.
The wind speed of described center carrier pipe is that the wind speed of 10 ~ 15m/s, primary wind and powder passage is that the wind speed of 15 ~ 20m/s, inner second air passage is that the wind speed of 20 ~ 28m/s, outer second air passage is 25 ~ 35m/s.
The wind of described inner second air passage, the output of the outer second air road separately ratio of secondary air channel total blast volume is: 55 ~ 65% and 45 ~ 35%.
The first order and second level oil liquefied gas are all taked diffusion combustion mode.
The flow velocity of first order oil liquefied gas is 15 ~ 20m/s, and second level oil liquefied gas high velocity stream plume speed is 35 ~ 45m/s.
The beneficial effects of the utility model compared with prior art.
1, in the primary combustion zone of turbulent burner front end, introduce first order oil liquefied gas, in the central area of burner outlet, form the torch of oil liquefied gas, improve igniting and the burning condition of coal dust, improve the stability of pulverized coal flame; Second level oil liquefied gas is sent into the middle part of primary combustion zone afterbody and intermediate zone in high velocity stream thigh mode, formed the reducing zone of a constant volume, the NOx generating in reduction primary combustion zone.
2, adopt the method for the outer secondary direct current wind of higher proportion, according to the character of coal dust and the pattern of burner hearth (vertical, horizontal), the ratio selection range of the shared Secondary Air total amount of outer second air is 35 ~ 45%, the central burner region of higher proportion direct current outer second air parcel reducing atmosphere, make furnace water cooling wall all the time under oxidizing atmosphere, can prevent wall slagging scorification and high temperature corrosion.
3, second level oil liquefied gas, in the violent burning of intermediate zone front end area, is conducive to the extension of thermal-flame, and it is more reasonable that the high-temperature region in burner hearth distributes, and improved burner hearth heat transmission conditions, is conducive to improve boiler thermal output.
4, the utility model be take small and medium-sized industrial coal powder boilers as main objective for implementation, be applicable to the transformation of newly-designed industrial coal powder boiler and active service coal-burned industrial boiler, this method is applicable to use power bituminous coal and the brown coal in domestic most areas, and flue gas NOx content can be reduced to 200mg/m
3left and right.
Accompanying drawing explanation
Fig. 1 is a kind of structure principle chart of expanding the device of the applicable coal of small and medium-sized industrial coal powder boilers.
The specific embodiment
As shown in Figure 1, a kind of device of expanding the applicable coal of small and medium-sized industrial coal powder boilers, comprise turbulent burner 3, nozzle at turbulent burner 3 is furnished with center carrier pipe 8 from inside to outside successively, center wind duct 7, primary wind and powder passage 6, secondary air channel, secondary air channel comprises that inner second air passage 5 and outer second air passage 4 and inner second air passage 5 are positioned at the inner side of outer second air passage 4, the centre wind of center carrier pipe 8 outputs, wind of primary wind and powder passage 6 output and the outer second air of outer second air road output are single flow, wind is except for combustion-supporting, also have the effect that coal dust is transported to 3 wind snouts of turbulent burner concurrently, the coal dust delivery ratio of a wind is 0.8 ~ 1.2kg/kg, the inner second air of inner second air passage 5 outputs is strong eddy flow, in outer second air passage 4, be furnished with outer shroud nozzle, carrier pipe 8 ports of export in center are provided with has double-layer double-direction gas nozzle 9, gas nozzle 9 is for input oil liquefied gas in boiler, gas nozzle 9 comprises and is arranged on internal layer forward direction spout consistent with central axial direction and that spray forward, more than the oil liquefied gas input quantity that forward direction spout sprays into accounts for fuel gross calorific value %, and be arranged on and outer become 45 ~ 60 to spend angles with central axis, and the export-oriented spout spraying with circular pattern, more than the oil liquefied gas input quantity that export-oriented spout sprays into accounts for fuel gross calorific value %.
The wind speed of center carrier pipe 8 is that the wind speed of 10 ~ 15m/s, primary wind and powder passage 6 is that the wind speed of 15 ~ 20m/s, inner second air passage 5 is that the wind speed of 20 ~ 28m/s, outer second air passage 4 is 25 ~ 35m/s, the center air quantity of described center carrier pipe 8 outputs is 2 ~ 3% of burner total blast volume, the primary air flow of primary wind and powder passage 6 outputs is 8 ~ 20% of burner total blast volume, secondary air channel is 67 ~ 90% of burner total blast volume, and the wind of inner second air passage 5, the output of the outer second air road separately ratio of secondary air channel total blast volume is: 55 ~ 65% and 45 ~ 35%.
Expand a method for the applicable coal of small and medium-sized industrial coal powder boilers, adopt the swirl flow combustion mode of air stage feeding, realize as follows:
(1) in the central area of turbulent burner 3 front ends, introduce first order liquefied petroleum gas, formation center torch 2, first order oil liquefied gas is provided by the export-oriented spout of gas nozzle 9, first order liquefied petroleum gas is outside spray line 10 ejections of flow velocity with 15 ~ 20m/s with the direction that becomes 45 ~ 60 ° of angles with gas nozzle 9 axis from export-oriented spout, the flow velocity of first order oil liquefied gas is 15 ~ 20m/s, first order oil liquefied gas is taked diffusion combustion mode, improve catching fire and burning condition of coal dust, stablize pulverized coal flame, control primary combustion zone atmosphere simultaneously, suppress the generation of NOx,
(2) second level oil liquefied gas is provided jointly by the forward direction spout of gas nozzle 9 and the outer shroud nozzle that is furnished with in outer second air passage 4, second level oil liquefied gas high velocity stream thigh 1 flow velocity is 35 ~ 45m/s, first order oil liquefied gas is taked diffusion combustion mode, second level oil liquefied gas is passed to primary combustion zone in the mode of high velocity stream thigh 1, send into and take carbon element burning as main primary combustion zone afterbody and the zone line of intermediate zone, in this region, form stronger reducing atmosphere, the CHi that utilizes second level oil liquefied gas generated by thermal cracking and low oxygen combustion, HCN, NHi, CO group, the reduced zone of expansion high-temperature flue gas, the NOx generating in reduction primary combustion zone,
(3) after the NOx effect generating in second level oil liquefied gas reduction primary combustion zone, along with burner outer second air continue sneak into, unburned completely second level oil liquefied gas combustion product and coal dust burns away, and realizes the abundant after-flame of coal dust.
The present embodiment is specially second level liquefied petroleum gas high velocity stream thigh 1 and ejects with ring-type multipoint system by outer second air passage 4, through the rich fuel fire fugitive constituent cracking in primary combustion zone, discharge district 11,12He high temperature reduction district, the violent combustion zone of low-oxygen high-temperature 13, to burner flame depths, spray, jet velocity span is 35 ~ 45m/s, and allowing to take its calorific value of L. P. G tolerance of high velocity jet is 10 ~ 30% of burner fuel gross calorific value.Oil liquefied gas high velocity stream thigh 1 is when the high-temperature flue gas, and stream thigh lateral contacts with high-temperature flue gas, and the oil liquefied gas in outside is lighted, and forms the long torch of a series of strips respectively at center and outer shroud, can further combustion-supporting coal dust, stablize pulverized coal flame; And most liquefied petroleum gas of high velocity stream thigh 1 are when arriving at primary combustion zone afterbody and intermediate zone, impact because of kinetic energy decay and ambient windstream, in compare great region, the center of flame, constantly mix, decompose, burn with flue gas, in certain area in the middle of primary combustion zone afterbody and intermediate zone the initial segment, form the NOx reducing zone 14 of larger volume, the NOx that constantly before reduction, coal dust firing generates, and maintain intermediate zone flue-gas temperature and be in higher level.Because the traction of liquefied petroleum gas high velocity stream thigh 1, second level oil liquefied gas to the maintenance of flue-gas temperature and lifting, have further expanded the high-temperature region of burner hearth in intermediate zone burning, fire box temperature is distributed more rational.
In the present embodiment, so-called primary combustion zone is: the combustion zone of a wind.
In the present embodiment, so-called intermediate zone is: other combustion space except primary combustion zone.
In the present embodiment, so-called NOx reducing zone 14 is: in flame kernel region, oxygen concentration is lower, the interval that CHi, HCN, NHi, CO group quantity are relatively many.
In the present embodiment, so-called rich fuel fire fugitive constituent cracking release district 11 is: before burner outlet, coal dust is lighted, primary wind and powder air-flow is under the acting in conjunction of the radiation heating of the heat convection of backflow flue gas, coal dust self burning heat release and environment, and in coal, fugitive constituent accelerates to separate out the interval with cracking.
In the present embodiment, the violent combustion zone 12 of so-called low-oxygen high-temperature is: through previous coal dust firing, the oxygen amount that wind carries is consumed in a large number, and flue-gas temperature obtains raising by a relatively large margin, therefore can occur that the ，Gai region, coal dust high-velocity combustion region of certain limit is subdivided into the violent combustion zone of low-oxygen high-temperature conventionally at flame kernel regional area.
In the present embodiment, so-called high temperature reduction district 13 is: after the violent combustion zone of low-oxygen high-temperature, one time wind divides the oxygen major part of carrying to be consumed, and flue gas now has obvious reproducibility feature, there will be the partial reduction phenomenon of NOx; And flue-gas temperature is now very high, so when describing the low nitrogen burning technology of burner, generally this region is called to high temperature reduction district.
The above is only preferred embodiment of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (4)
1. expand the device that small and medium-sized industrial coal powder boilers is suitable for coal for one kind, it is characterized in that: comprise turbulent burner, nozzle at turbulent burner is furnished with center carrier pipe from inside to outside successively, center wind duct, primary wind and powder passage, secondary air channel, described secondary air channel comprises that inner second air passage and outer second air passage and inner second air passage are positioned at the inner side of outer second air passage, the centre wind of described center carrier pipe output, wind of primary wind and powder passage output and the outer second air of outer second air road output are single flow, the inner second air of described inner second air passage output is strong eddy flow, in described outer second air passage, be furnished with outer shroud nozzle, the described center carrier pipe port of export is provided with has double-layer double-direction gas nozzle, described gas nozzle comprises and is arranged on internal layer forward direction spout consistent with central axial direction and that spray forward, and be arranged on and outer become 45 ~ 60 to spend angles with central axis, and the export-oriented spout spraying with circular pattern.
2. according to a kind of described in claim 1, expand the device of the applicable coal of small and medium-sized industrial coal powder boilers, it is characterized in that: the wind speed of described center carrier pipe is that the wind speed of 10 ~ 15m/s, primary wind and powder passage is that the wind speed of 15 ~ 20m/s, inner second air passage is that the wind speed of 20 ~ 28m/s, outer second air passage is 25 ~ 35m/s.
3. a kind of device of expanding the applicable coal of small and medium-sized industrial coal powder boilers according to claim 2, it is characterized in that: the center air quantity of described center carrier pipe output is 2 ~ 3% of burner total blast volume, the primary air flow of primary wind and powder passage output is 8 ~ 20% of burner total blast volume, and secondary air channel is 67 ~ 90% of burner total blast volume.
4. a kind of device of expanding the applicable coal of small and medium-sized industrial coal powder boilers according to claim 3, is characterized in that: the wind of described inner second air passage, the output of the outer second air road separately ratio of secondary air channel total blast volume is: 55 ~ 65% and 45 ~ 35%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307595A (en) * | 2013-06-25 | 2013-09-18 | 山西蓝天环保设备有限公司 | Device and method for expanding types of coal suitable for small and medium-sized industrial pulverized coal boilers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103307595A (en) * | 2013-06-25 | 2013-09-18 | 山西蓝天环保设备有限公司 | Device and method for expanding types of coal suitable for small and medium-sized industrial pulverized coal boilers |
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Granted publication date: 20140219 Termination date: 20150625 |
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