CN203963905U - Boiler afterheat utilizes finned tube low-pressure coal saver system - Google Patents
Boiler afterheat utilizes finned tube low-pressure coal saver system Download PDFInfo
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- CN203963905U CN203963905U CN201320877394.XU CN201320877394U CN203963905U CN 203963905 U CN203963905 U CN 203963905U CN 201320877394 U CN201320877394 U CN 201320877394U CN 203963905 U CN203963905 U CN 203963905U
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Abstract
Boiler afterheat utilizes finned tube low-pressure coal saver system, formed by intake pump (1), low-pressure heating district I (2), low-pressure heating district II (3), low-pressure heating district III (4), recirculation pipe (5), low-pressure coal saver (6), it is characterized in that: between described low-pressure heating district I (7) and low-pressure coal saver (6), be also parallel with recirculation pipe (5), come dual regulation flow through outlet water temperature and the inlet water temperature of low-pressure coal saver (6).The utility model, has reduced cold end corrosion, improves low-pressure coal saver service life, and makes the low-pressure coal saver optimum state in recovery waste heat all the time.
Description
Technical field
The utility model relates to the UTILIZATION OF VESIDUAL HEAT IN field of boiler, especially utilizes finned tube low-pressure coal saver system about a kind of boiler afterheat.
Background technology
Low-pressure coal saver is that the smoke discharging residual heat of interior application in recent years utilizes equipment.Conventional low-pressure coal saver is identical with common economizer structure, but its link system (working medium side) is different from other economizer on boiler.Its working medium is imported and exported the low-pressure heating district (hence obtaining one's name) that is bound up on steam turbine therrmodynamic system, from certain grade of low-pressure heater condensate water out, partly (parallel system: and in one or several low adding) or whole (train; String is between two low adding) enter in the low-pressure coal saver being arranged in after air preheater and heat, the water after heating returns to low adding system again.Its energy-saving principle is to utilize boiler exhaust gas waste-heat condensate water, is equivalent to pure heat and enters therrmodynamic system, and according to Equivalent Entropy Drop Method analysis, it squeezes part heating and draws gas, and returns to steam turbine and continues work done.In the situation that fuel is constant, obtain electric work more, improve the economy of unit.The conventional low economizer following shortcoming that has been in operation: be first etching problem.Because it is arranged in the low cigarette warm area of boiler tail, thereby inevitably produce and corrode, although in design can consider tube wall temperature to be controlled at the second corrosion region (etching extent <0.2mm/), if but ature of coal is changeable and boiler is born peak regulation task or long-time underrun etc., make actual motion cannot meet the condition that design proposes, thereby heating surface can produce corrosion, affect equipment life; Secondly, during due to design, to control wall temperature and should too lowly not meet etching condition, thereby low-pressure coal saver inlet water temperature design higher (acid dew point+10 DEG C), exhaust gas temperature so just can not significantly be reduced, recovery waste heat off-target state.
Summary of the invention
For above deficiency, the purpose of this utility model is to provide a kind of boiler afterheat to utilize finned tube low-pressure coal saver system, and be increases economizer recirculation on low-pressure coal saver, can improve the inlet temperature of low-pressure coal saver, reduce cold end corrosion, improve low-pressure coal saver service life.
The technical solution of the utility model is achieved in the following ways: boiler afterheat utilizes finned tube low-pressure coal saver system, formed by intake pump, low-pressure heating district I, low-pressure heating district II, low-pressure heating district III, recirculation pipe, low-pressure coal saver, low-pressure heating district I and low-pressure coal saver parallel connection, temperature controller I and temperature controller II are arranged on respectively the entrance and exit of low-pressure coal saver, control valve is arranged on the porch of recirculation pipe, and inlet water temperature degree control valve is arranged on the porch of low-pressure heating district II; It is characterized in that: between described low-pressure heating district I and low-pressure coal saver, be also parallel with recirculation pipe, come dual regulation flow through outlet water temperature and the inlet water temperature of low-pressure coal saver.
The inside of described low-pressure coal saver is made up of finned tube, and the caliber of finned tube is φ 32 × 3.5mm, and the height of fin is 12mm, and the thickness of fin is 1.5mm, and the spacing of fin is 12mm; The finned tube of this specification is in the situation that dust stratification is not serious, has increased heat exchange area as far as possible.
The first six mining of described low-pressure coal saver is made with ND steel, the cold end corrosion of avoiding porch to produce, the resistance to corrosion of enhancing low-pressure coal saver.
The utility model, by increase economizer recirculation pipe on low-pressure coal saver, can improve the inlet temperature of low-pressure coal saver, reduces cold end corrosion, improves low-pressure coal saver service life, and makes the low-pressure coal saver optimum state in recovery waste heat all the time.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
In figure, 1 is intake pump, the 2nd, and low-pressure heating district I, the 3rd, low-pressure heating district II, the 4th, low-pressure heating district III, the 5th, recirculation pipe, the 6th, low-pressure coal saver, the 7th, temperature controller I, the 8th, temperature controller II, the 9th, control valve, 10 inlet water temperature degree control valves.
Detailed description of the invention
Known by Fig. 1, boiler afterheat utilizes finned tube low-pressure coal saver system, comprises intake pump 1, low-pressure heating district I 2, low-pressure heating district II 3, low-pressure heating district III 4, recirculation pipe 5, low-pressure coal saver 6, temperature controller I 7, temperature controller II 8, control valve 9 and inlet water temperature degree control valve 10; Arrow in Fig. 1 represents the flow direction of condensate water, condensate water is from intake pump 1 suction, successively by low-pressure heating district I 2, low-pressure heating district II 3 and low-pressure heating district III 4, recirculation pipe 5 and low-pressure coal saver 6 are in parallel with low-pressure heating district I 2,6 entrance and exits that temperature controller I 7 and temperature controller II 8 are arranged on respectively low-pressure coal saver, control valve 9 is arranged on the entrance of recirculation pipe 5, and inlet water temperature degree control valve 10 is arranged on the entrance of low-pressure heating district II 3; When work, condensate water is by suction pump 1 suction, while flowing out low-pressure heating district I 2, flow to respectively low-pressure heating district II 3 and low-pressure coal saver 6, the outlet water temperature of the low-pressure coal saver 6 of surveying when temperature controller II 8 is lower than 103 DEG C, inlet water temperature degree control valve 10 reduces the influx of low-pressure heating district II, otherwise increases; In the time that No. 1 temperature controller 7 records low-pressure coal saver 6 inlet water temperatures lower than 60 DEG C, recirculation pipe 5 will be opened automatically, and the part hot water that low-pressure coal saver 6 exports returns to import, improve inlet water temperature; Control the control valve I 9 on recirculation conduit by temperature controller I 7, make inlet water temperature maintain 61.5 DEG C; If low-pressure coal saver 6 inlet water temperatures are higher than 65 DEG C, recirculation pipe 5 will be closed automatically.
On described recirculation pipe 5, non-return valve, water circulating pump, control valve and stop valve are installed, described water circulating pump has manually and automatic two kinds of patterns: manual mode, the opening and closing of water circulating pump, and control valve on circulating pump pipeline, by operations staff according to importing and exporting water temperature manual adjustments; Automatic mode, water circulating pump is by low-pressure coal saver 6 inlet water temperature controls, and when low-pressure coal saver 6 inlet water temperatures are during lower than 60 DEG C, recirculation water pump is opened automatically, and the part hot water that low-pressure coal saver 6 exports returns to import, improves inlet water temperature; By inlet water temperature degree control valve 10 apertures, make inlet water temperature maintain 61.5 DEG C; If low-pressure coal saver inlet water temperature is higher than 65 DEG C, water circulating pump cuts out automatically.
The inside of described low-pressure coal saver is made up of finned tube, and the caliber of finned tube is φ 32 × 3.5mm, and the height of fin is 12mm, and the thickness of fin is 1.5mm, and the spacing of fin is 12mm; The finned tube of this specification is in the situation that dust stratification is not serious, has increased heat exchange area as far as possible.
The first six mining of described low-pressure coal saver is made with ND steel, the cold end corrosion of avoiding porch to produce, the resistance to corrosion of enhancing low-pressure coal saver.
The water temperature of low-pressure coal saver 6 water inlets is lower than 60 DEG C, recirculation pipe 5 is opened automatically, regulates water circulating pump and control valve, regulates circulating water flow, the part hot water being exported by low-pressure coal saver 6 returns to low-pressure coal saver 6 imports through recirculation pipe 5, improves inlet water temperature and maintains 61.5 DEG C; If low-pressure coal saver 6 inlet water temperatures are higher than 65 DEG C, recirculation pipe 5 is closed automatically by non-return valve and stop valve.
Native system designs by the following method:
1. design condition
(1) design fuel characteristic
Boiler design burning coal: Car=31.03% Har=2.16% Oar=8.82% Nar=0.56%
Sar=0.28% Aar=32.88% War=24.0% Vdaf=46.77% Qnet.ar=11.304Mj/kg
(2) calculated fuel consumption: 75t/h (100%), 60t/h (80%), 52.5t/h (70%).
(3) electric cleaner exit excess air coefficient: α=1.45
(4) import cigarette temperature: 170 DEG C, 162 DEG C, 160 DEG C.
(5) inlet water temperature: 55.3 DEG C, 61.5 DEG C, 68.9 DEG C, 71.9 DEG C;
Outlet water temperature: 85.9 DEG C, 93.9 DEG C, 103.4 DEG C, 107.4 DEG C.
(6) fall ≯ 500Pa of flue gas resistance.
2. basic parameter
(1) theoretical air requirement Vo=3.041Nm3/kg, amount of theoretical flue gas Vy=4.97Nm3/kg;
(2) finned tube low-pressure coal saver air leakage coefficient: Δ α=0.01
(3) flue gas and air enthalpy
(4) working-medium water enthalpy
| Temperature | I（kj/kg） |
| 50℃ | 210 |
| 100℃ | 419 |
| 150℃ | 632 |
(5) acid dew-point temperature is checked and is calculated
The calculation of dew-point temperature of acid of flue gas calculates by following formula:
In formula:
for water dew point,
for conversion sulfur,
for conversion ash.The flue gas acid dew point temperature that uses brown coal is 93 DEG C.
By calculating following data
Heat exchange area when finned tube low-pressure coal saver low-pressure heating arranged side by side district II 3 is 4916M2, be 355 Kj/kg in the heat exchange amount of peak load operating mode, flue-gas temperature is reduced to 117.6 DEG C by 170 DEG C, flue gas temperature drop is 52.4 DEG C, condensing water temperature is brought up to 107.4 DEG C by 71.9 DEG C, and heating water flow is 331t/h, and squeezing the amount of drawing gas is 20.5t/h, cylinder thermal efficiency improves 1.4% relatively, Reducing Coal Consumption 5.3g.Be 360 Kj/kg in the heat exchange amount of 70% load condition, flue-gas temperature is reduced to 108.7 DEG C by 162 DEG C, flue gas temperature drop is 53.3 DEG C, condensing water temperature is brought up to 93.9 DEG C by 61.5 DEG C, heating water flow is 284t/h, squeezing the amount of drawing gas is 15.6t/h, and cylinder thermal efficiency improves 1.18% relatively, Reducing Coal Consumption 4.5g.In the time of 50% load, as carried out heating power calculating according to the import and export water temperature of low-pressure heating district II 3 completely, the heating water yield needing is 254t/h, exceed the condensing capacity of system, in order to ensure to heat the condensate water water yield of the water yield lower than system, to export water temperature and improve 103.4 DEG C, in addition because inlet water temperature is 55.3 DEG C, easily cause low-pressure coal saver inlet tube wall temperature low, produce cold end corrosion, for fear of cold end corrosion phenomenon occurs, adopt the method for Installing Low Pressure Economizer recirculation, inlet water temperature is brought up to 61.5 DEG C by 55.3 DEG C, the recirculation water yield is 21t/h, heating water flow is 142t/h, heat exchange amount is 340 Kj/kg, cylinder thermal efficiency improves 0.63% relatively, Reducing Coal Consumption 2.4g, reduce the corresponding levels 7.3t/h that bleeds, reduce the 3.4t/h that bleeds of subordinate.
In the time that the load of boiler unit is 50%, inlet water temperature is 61.5 DEG C, and now the temperature of tube wall is about 82 DEG C, lower than 93 DEG C of the acid dew-point temperatures of flue gas, easily causes the raw cold end corrosion of low-pressure coal saver 6 import departments' pipe schedulings, reduces physical life.For fear of producing cold end corrosion, can adopt the front 6 minings ND steel at the entrance of low-pressure coal saver 6, strengthen the resistance to corrosion of low-pressure coal saver 6.
In addition, when 50% of boiler unit is loaded, the condensing capacity of steam turbine is 229t/h, water temperature is 55.3 DEG C, in the time of this operating mode operation, can open recirculation pipe 5, it is more than 61.5 DEG C improving low-pressure coal saver 6 inlet water temperatures, in the time that inlet water temperature reaches 65 DEG C, closes recirculation pipe 5.
The utility model, by recirculation pipe 5 in parallel on low-pressure coal saver 6, makes the inlet temperature temperature of low-pressure coal saver 6 61.5 DEG C of left and right, has reduced cold end corrosion, improves low-pressure coal saver service life; By temperature controller II 8 and inlet water temperature degree control valve 10, make the low-pressure coal saver optimum state in recovery waste heat all the time.
Claims (3)
1. boiler afterheat utilizes finned tube low-pressure coal saver system, formed by intake pump (1), low-pressure heating district I (2), low-pressure heating district II (3), low-pressure heating district III (4), recirculation pipe (5), low-pressure coal saver (6), low-pressure heating district I (2) and low-pressure coal saver (6) parallel connection, temperature controller I (7) and temperature controller II (8) are arranged on respectively the entrance and exit place of low-pressure coal saver (6), control valve (9) is arranged on the porch of recirculation pipe (5), and inlet water temperature degree control valve (10) is arranged on the porch of low-pressure heating district II (3); It is characterized in that: between described low-pressure heating district I (7) and low-pressure coal saver (6), be also parallel with recirculation pipe (5), come dual regulation flow through outlet water temperature and the inlet water temperature of low-pressure coal saver (6).
2. boiler afterheat according to claim 1 utilizes finned tube low-pressure coal saver system, it is characterized in that: the inside of described low-pressure coal saver (6) is made up of finned tube, the caliber of finned tube is φ 32 × 3.5mm, the height of fin is 12mm, the thickness of fin is 1.5mm, and the spacing of fin is 12mm.
3. boiler afterheat according to claim 1 utilizes finned tube low-pressure coal saver system, it is characterized in that: the first six mining ND steel of described low-pressure coal saver (6) is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877394.XU CN203963905U (en) | 2013-12-30 | 2013-12-30 | Boiler afterheat utilizes finned tube low-pressure coal saver system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877394.XU CN203963905U (en) | 2013-12-30 | 2013-12-30 | Boiler afterheat utilizes finned tube low-pressure coal saver system |
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| Publication Number | Publication Date |
|---|---|
| CN203963905U true CN203963905U (en) | 2014-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320877394.XU Expired - Fee Related CN203963905U (en) | 2013-12-30 | 2013-12-30 | Boiler afterheat utilizes finned tube low-pressure coal saver system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526577A (en) * | 2015-12-22 | 2016-04-27 | 东方菱日锅炉有限公司 | Control-stable low-low-temperature coal economizer system |
| CN110715444A (en) * | 2019-10-29 | 2020-01-21 | 辽宁绿源能源环保科技集团有限责任公司 | Graded water return grate firing boiler system |
-
2013
- 2013-12-30 CN CN201320877394.XU patent/CN203963905U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526577A (en) * | 2015-12-22 | 2016-04-27 | 东方菱日锅炉有限公司 | Control-stable low-low-temperature coal economizer system |
| CN105526577B (en) * | 2015-12-22 | 2018-05-15 | 东方菱日锅炉有限公司 | The low low-level (stack-gas) economizer system of regulation and control can be stablized |
| CN110715444A (en) * | 2019-10-29 | 2020-01-21 | 辽宁绿源能源环保科技集团有限责任公司 | Graded water return grate firing boiler system |
| CN110715444B (en) * | 2019-10-29 | 2021-08-10 | 辽宁绿源能源环保科技集团有限责任公司 | Graded water return grate firing boiler system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 Termination date: 20191230 |