CN218393085U - Automatic start-stop device for wet desulphurization oxidation fan - Google Patents
Automatic start-stop device for wet desulphurization oxidation fan Download PDFInfo
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- CN218393085U CN218393085U CN202222547100.9U CN202222547100U CN218393085U CN 218393085 U CN218393085 U CN 218393085U CN 202222547100 U CN202222547100 U CN 202222547100U CN 218393085 U CN218393085 U CN 218393085U
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Abstract
The utility model discloses an automatic device that opens and stops of wet flue gas desulfurization oxidation fan, including wet flue gas desulfurization tower, oxygen supply fan, circulating pump and controller, one side of wet flue gas desulfurization tower is provided with the oxygen supply fan, the utility model discloses an install flue gas flowmeter and former cigarette sulfur dioxide flowmeter on advancing the tobacco pipe, and install clean cigarette sulfur dioxide flowmeter on the top blast pipe of wet flue gas desulfurization tower, data transmission to the controller that flue gas flowmeter, former cigarette sulfur dioxide flowmeter and clean cigarette sulfur dioxide flowmeter calculated calculates SO 2's real-time desorption volume data through the controller, be less than 1000kg/h when SO 2's real-time desorption volume data, close the oxygen supply fan through the controller, take the natural oxidation mode, the utility model discloses an oxidation fan intermittent operation is experimental, obtains the boundary condition of putting into operation oxidation fan, best operation mode, on the basis of guaranteeing unit operation safety, reduces the desulfurization factory power consumption and reduces relevant operation, maintenance cost.
Description
Technical Field
The utility model relates to a flue gas desulfurization technical field specifically is an automatic device that opens and stops of wet flue gas desulfurization oxidation fan.
Background
With the development of industry and the improvement of living standard of people, the craving for energy is increasing, SO2 in coal-fired flue gas becomes the main cause of air pollution, the reduction of SO2 pollution becomes the urgent need of atmospheric environment treatment at present, a plurality of flue gas desulfurization processes are widely applied in industry, and have important practical significance for the treatment of tail gas of various boilers and incinerators, the desulfurization technology can be divided into a dry method, a semi-dry method and a wet method, and the limestone (lime) wet desulfurization technology is widely applied in the field of wet FGD due to the fact that an absorbent is cheap and easy to obtain.
Limestone-gypsum wet flue gas desulfurization process using absorbent limestone (CaCO) 3 ) With SO in flue gas 2 The reaction process is as follows:
absorption reaction: SO (SO) 2 Reacting with water to produce large quantities of H + So that the solution is acidic and the pH value of the solution is low,
and (3) neutralization reaction: limestone dissolves and consumes hydrogen ions, producing calcium ions
CaCO 3 →Ca 2+ +CO 3 2－ ；CO 3 2－ +2H + →H 2 O+CO 2
And (3) oxidation reaction: sulfite oxidation
Crystallizing gypsum: full oxidation condition
Ca 2+ +SO 4 2- +2H 2 O→CaSO 4 ·2H 2 O
Under oxidation condition
There are two pathways for sulfite oxidation: firstly, the oxygen in the smoke is combined, which is called natural oxidation; and the second is the combination with oxygen blown into air by an oxidation fan of the absorption tower, which is called forced oxidation. The natural oxidation rate of the slurry of the absorption tower is mainly related to factors such as the oxygen content of flue gas, the operation quantity of a circulating pump of the absorption tower, the structure of the absorption tower and the like, wherein the oxygen content of the flue gas is mainly related to factors such as the boiler type, the coal type, the combustion working condition and the like, under the design of coal quality and the combustion working condition of coal, the oxygen content of the original flue gas of the desulfurization absorption tower is basically about 6 percent, the recommended natural oxidation rate empirical value is basically 15 to 20 percent, and the natural oxidation rate formula is as follows after examining and reviewing related documents and summarizing and refining:
wherein:
ω 0 For designing the original flue gas SO 2 The content of the alpha-electricity is 1375mg/Nm 3
Q 0 For the design of the flue gas flow, the Electricity is 1179120Nm 3 H (standard, dry basis, 6% O) 2 )
ω 1 for oxidizing the original flue gas SO during the shutdown period of the fan 2 Data of concentration meter
Q 1 The average value of the flue gas flow is;
1 Effect of Oxidation wind System anomaly on desulfurization System
1.1 influence of oxidative windage
The current wet flue gas desulfurization technique all is equipped with forced oxidation fan, the oxidation fan keeps the operation during desulfurization system operation, in order to guarantee that the sulfite is oxidized to the required oxygen content of sulfate, but forced oxidation air volume is bigger than normal, will lead to the interior bubble of desulfurization thick liquid to increase, and then lead to the decline of thick liquid density, desulfurization thick liquid circulating pump operating current descends, and then the pump is exerted oneself and is reduced, desulfurization efficiency descends, increase desulfurization system's power consumption, influence desulfurization system's running cost, on the other hand abundant air overflows to the thick liquid surface from oxidation zone bottom with the form of bubble, easily lead to the appearance of false liquid level, especially easily impel absorption tower thick liquid and overflow even when impurity is more bubbly in the absorption tower.
1.2 influence of insufficient Oxidation air volume
The forced oxidation air flow is too small, which can affect the safe operation of the desulfurization equipment and the system, because the oxidation of CaSO3 is seriously inhibited, enough gypsum crystals can not be generated to lead the rapid growth of gypsum varieties, the gypsum slurry contains a large amount of CaSO3 which is difficult to dehydrate, CSS scale (mixed crystal of two substances of CaSO3.1/2H 2O and CaSO4.2H2O) can be formed in the desulfurization equipment, mixed crystal of semi-hydrated gypsum and dihydrate gypsum is formed in the desulfurization system, the blockage of the desulfurization absorption tower equipment and pipelines is caused, on the other hand, the quality of the desulfurization by-product gypsum is affected, and the slurry density is changed after the absorption tower slurry circularly absorbs S02 in flue gas to generate CaSO3 and the CaSO3 is oxidized into CaSO 4. When the oxidation amount of wind is little, the thick liquid density is low excessively can produce thick liquid "viscous" on the gypsum belt feeder, cause gypsum crystallization and belt feeder dehydration difficulty, when gypsum thick liquid density is less than a definite value, the limestone content in the thick liquid is high, reduce the utilization ratio of desulfurizer, the quality of gypsum can not be guaranteed simultaneously, the comprehensive utilization of gypsum just is difficult to realize, consequently, the oxygen content that the desulfurization absorption tower needs accurate control relatively, can guarantee desulfurization system safe operation on the one hand, on the other hand can guarantee the quality of gypsum by-product.
At present, the oxygen supply fan of current wet flue gas desulfurization technique is in normally open state in the use always, can't carry out accurate control to the oxygen content that the desulfurization absorption tower needs, can't open automatically according to the in-service use needs and stop, and then can't realize forcing oxidation and natural oxidation's nimble conversion on the basis of guaranteeing unit operation safety, lead to that the desulfurization plant power consumption is too high, maintenance cost is too high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an automatic device that opens and stop of wet flue gas desulfurization oxidation fan to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides an automatic device that opens of opening of wet flue gas desulfurization oxidation fan, includes the wet flue gas desulfurization tower, send oxygen fan, circulating pump and controller, one side of wet flue gas desulfurization tower is provided with and send the oxygen fan, the end of giving vent to anger of sending the oxygen fan is connected with the oxidation tuber pipe, the annular tube of oxidation tuber pipe and setting installation in the wet flue gas desulfurization tower, four oxidation wind nozzles are installed to the bottom of annular tube, the interior bottom of wet flue gas desulfurization tower just installs the agitator to four oxidation wind nozzles, one side of wet flue gas desulfurization tower is installed into the tobacco pipe, it installs flue gas flowmeter and former cigarette sulfur dioxide flowmeter on the tobacco pipe to advance, the blast pipe is installed at the top of wet flue gas desulfurization tower, install clean cigarette sulfur dioxide flowmeter on the blast pipe.
As a further aspect of the present invention: and an atomizer is arranged at the top of the wet desulphurization tower.
As a further aspect of the present invention: one side of wet flue gas desulfurization tower is provided with the circulating pump, the end of intaking of circulating pump communicates with the bottom of wet flue gas desulfurization tower, the circulating pipe is installed to the play water end of circulating pump, the top of circulating pipe with violently insert the shower of establishing in the inside of wet flue gas desulfurization tower and be connected, the shower bottom evenly is provided with oxidizing air nozzle.
As the utility model discloses further scheme again: and the oxidation air pipe is provided with a check valve, and the exhaust pipe is connected with an external dust remover.
As the utility model discloses further scheme again: the outer wall of the wet desulphurization tower is provided with a controller, the flue gas flowmeter, the raw smoke sulfur dioxide flowmeter and the clean smoke sulfur dioxide flowmeter are electrically connected with the controller through leads, and the controller is electrically connected with the oxygen supply fan through leads.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses an install flue gas flowmeter and former cigarette sulfur dioxide flowmeter on advancing the tobacco pipe to and install clean cigarette sulfur dioxide flowmeter on wet flue gas desulfurization tower's top blast pipe, flue gas flowmeter, the data transmission that former cigarette sulfur dioxide flowmeter and clean cigarette sulfur dioxide flowmeter calculated to the controller, calculate SO 2's real-time desorption volume data through the controller, be less than 1000kg/h as SO 2's real-time desorption volume data, close the oxygen supply fan through the controller, take the natural oxidation mode, the utility model discloses an oxidation fan intermittent type operation is experimental, obtains the boundary condition who commissions oxidation fan, best operational mode, on the basis of guaranteeing unit operation safety, reduces the desulfurization plant power consumption and reduces relevant operation, maintenance cost.
Drawings
Fig. 1 is a schematic diagram of an internal structure of an automatic start-stop device of a wet desulphurization oxidation blower.
Fig. 2 is an overall appearance diagram of an automatic start-stop device of a wet desulphurization oxidation blower.
Fig. 3 is a schematic block diagram of an automatic start-stop device of a wet desulphurization oxidation fan.
1. A wet desulfurization tower; 2. an oxygen supply fan; 3. oxidizing the air pipe; 4. an annular tube; 5. an oxidizing air nozzle; 6. a non-return valve; 7. a stirrer; 8. a circulation pump; 9. a circulation pipe; 10. a shower pipe; 11. a smoke inlet pipe; 12. a flue gas flow meter; 13. a controller; 14. an atomizer; 15. an exhaust pipe; 16. a raw smoke sulfur dioxide flow meter; 17. clean cigarette sulfur dioxide flowmeter.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1-3, in the embodiment of the present invention, an automatic start/stop device for wet desulphurization oxidation fan, including wet desulphurization tower 1, oxygen supply fan 2, circulating pump 8 and controller 13, one side of wet desulphurization tower 1 is provided with oxygen supply fan 2, the end of giving vent to anger of oxygen supply fan 2 is connected with oxidation tuber pipe 3, oxidation tuber pipe 3 and the ring pipe 4 of setting installation in wet desulphurization tower 1, four oxidation air nozzles 5 are installed to the bottom of ring pipe 4, the interior bottom of wet desulphurization tower 1 is just installing agitator 7 to four oxidation air nozzles 5, it needs to explain the utility model discloses oxidation air nozzle adopts the spray gun formula, and four oxidation air nozzles 5 are arranged near agitator 7 respectively, and one side of wet desulphurization tower 1 is installed into tobacco pipe 11, advances to install flue gas flowmeter 12 and former smoke flowmeter 16 on the tobacco pipe 11, and exhaust pipe 15 is installed at the top of wet desulphurization tower 1, installs clean smoke sulfur dioxide flowmeter 17 on exhaust pipe 15.
The atomizer 14 is installed at the top in the wet desulphurization tower 1, and the atomizer 14 can atomize and intercept water molecules carried in the rising air flow.
One side of wet flue gas desulfurization tower 1 is provided with circulating pump 8, and circulating pump 8's the end of intaking communicates with the bottom of wet flue gas desulfurization tower 1, and circulating pump 9 is installed to circulating pump 8's play water end, and circulating pump 9's top is connected with violently inserting the shower 10 that sets up in wet flue gas desulfurization tower 1 inside, and shower 10 bottom evenly is provided with oxidizing air nozzle 5.
The oxidation air pipe 3 is provided with a check valve 6, the check valve 6 can prevent slurry in the wet desulphurization tower 1 from being reversely infused into the oxygen supply fan 2 after the oxygen supply fan 2 is closed, the exhaust pipe 15 is connected with an external dust remover, and the oxygen supply fan 2 is an RRF-240 type Roots blower.
Install controller 13 on wet flue gas desulfurization tower 1 ' S the outer wall, flue gas flowmeter 12, former cigarette sulfur dioxide flowmeter 16 and clean cigarette sulfur dioxide flowmeter 17 pass through wire and controller 13 electric connection, controller 13 passes through wire and 2 electric connection of oxygen supply fan, flue gas flowmeter 12 model is SFM800, controller 13 model is the programmable controller that is on sale on the market for S7-200, controller 13 ' S control circuit can realize through the simple programming of technical staff in the field, belong to the well-known general knowledge in the field, and the utility model discloses mainly be used for protecting mechanical device, so the utility model discloses no longer explain control mode and circuit connection in detail, former cigarette sulfur dioxide flowmeter 16 and clean cigarette sulfur dioxide flowmeter 17 ' S model is the LZ TY.
In order to verify the correctness of the technical scheme of the utility model, the applicant carries out the shutdown test of the oxidation fan, and after measurement and calculation, the oxidation air volume is in a serious excess state for a long time during the operation, and when the SO is at the inlet of the absorption tower 2 Less than 900mg/Nm 3 And in the full load stage, the utilization rate of the forced oxidation wind is less than 20 percent.
In view of the above situation, the applicant has performed three-stage oxidation fan shutdown tests in stages for more than two months, wherein the third-stage test has a continuous shutdown period of 24 days, during which changes in various parameters of the desulfurization system are observed, and sampling and testing are performed on the slurry in the absorption tower in stages, and analysis shows that under most working conditions, during the shutdown period of the oxidation fan, the desulfurization oxidation reaction can still realize a natural oxidation reaction process through oxygen carried in the flue gas at the inlet of the absorption tower without adverse effects.
3. Analysis of test conditions
2.1 oxygen demand balance calculation during the test
The theoretical oxygen demand is calculated according to the following formula:
wherein: omega 1 Is raw flue gas S0 2 Mean value
ω 2 For purifying flue gas S0 2 Mean value; q is mean value of flue gas flow
Epsilon is the molar ratio of sulfur to oxygen, and is taken as 1/2; rho is the oxygen density, and is 1.43kg/m3
t is the off-stream time (h) of the oxidation fan
The actual oxygen consumption during this period is calculated as follows:
wherein: c Original source Is raw flue gas 0 2 The average value of the contents is shown,
C medicine for treating rheumatism For purifying flue gas 0 2 Content average value
Q is the average value of the flow of the flue gas,
t is the off-stream time (h) of the oxidation fan
The theoretical oxygen demand and the actual oxygen consumption ratio of the second, third and fourth stages are calculated by the formula as follows:
the data show that the theoretical oxygen demand is substantially equal to the actual oxygen consumption. Theoretically, the two should be completely equal, but the flue gas flow of the unit is millions of orders of magnitude, and O is 2 The meter has certain error factors and can not realize O 2 The actual consumption is completely consistent with the theoretical consumption, and the theoretical oxygen demand is basically equal to the actual oxygen consumption, which means that after the oxidation fan is stopped, under the low-load working condition, the oxygen content in the original flue gas is enough to maintain CaSO 3 Conversion to CaSO 4 。
2.2 calculation of Natural Oxidation Rate during each load phase of the test
Since the fourth phase test lasts for one month and each load period is passed, the method is utilized
The natural oxidation rate at each load period was calculated as follows
According to the data, when the natural oxidation rate reaches 66%, the calcium sulfite exceeds the standard, and then the load of the unit is reduced, and the exceeding phenomenon disappears. Therefore, the natural oxidation rate of the desulfurization system designed by the power plant is about 65 percent, which corresponds to the natural oxidation rate
3. Predicted benefit
3.1 economic benefits
According to the conclusion, the applicant 2 x 350MW unit introduces SO2 on DCS to remove quantity data in real time
When M is less than 1000kg/h, namely the natural oxidation rate is less than 63%, a natural oxidation mode is adopted, and the annual auxiliary power utilization can be expected to be saved after the normal operation is expected
Wherein: voltage U =380V; the current I is the average current of the oxidation fan during operation, and is about 190A; cos phi is a power factor, and 0.90 is taken; the plant is phi, omega, Q/10 every year 6 The time period of less than 1000kg/h is about 300 days. The calculation shows that the annual energy consumption can be saved by 94 ten thousand kW.h.
2.5.2 other benefits
1. Raw water is saved: the cooling water quantity of the oxidation fan is 2.5m 3 The two units can save 36000m of raw water each year after the oxidation fan is shut down 3 。
2. And (3) noise reduction: the noise of this power plant's roots oxidation fan during operation reaches 85dB, is the biggest equipment of noise among the wet flue gas desulfurization system, stops to show after the oxidation fan that reduces the interior noise level between the desulfurization equipment.
3. The operation and maintenance cost is reduced: the operation and maintenance cost of the oxidation fan of the power plant can be saved by about 5 ten thousand yuan each year after the operation is stopped.
The utility model discloses a theory of operation is:
when in use, the flue gas enters the wet desulphurization tower 1 through the smoke inlet pipe 11, the circulating pump 8 pumps out the slurry in the wet desulphurization tower 1, the slurry is pumped to the top of the wet desulphurization tower 1 through the circulating pipe 9 and then is sprayed downwards through the spraying pipe 10, and absorbent limestone (CaCO) in the slurry is obtained 3 ) With SO in flue gas 2 The desulfurization reaction is carried out, the desulfurized gas is discharged through the exhaust pipe 15, the oxygen supply fan 2 can convey the external gas into the wet desulfurization tower 1 through the oxidation air pipe 3 in the process, the gas is sprayed out through the oxidation air nozzle 5 and matched with the stirrer 7 to supply oxygen for reaction, and when the flue gas enters the wet desulfurization tower 1 through the flue gas inlet pipe 11, the flue gas flowmeter 12 and the flue gas flowmeter 12 which are arranged on the flue gas inlet pipe 11 are connected with the stirrer 7The raw smoke sulfur dioxide flowmeter 16 can measure the total flow of the smoke in real time and measure sulfur dioxide contained in the smoke at the same time, the smoke-purifying sulfur dioxide flowmeter 17 arranged on the exhaust pipe 15 measures the residual sulfur dioxide in the smoke during exhaust, the measurement data is transmitted to the controller 13 in real time, the calculation formula is programmed in the controller 13, and when the controller 13 calculates SO 2 When the real-time removal amount data is less than 1000kg/h, the oxygen supply fan 2 is controlled to be closed, SO that the wet desulphurization tower 1 is converted from a forced oxidation mode to a natural oxidation mode, and SO is treated similarly 2 When the real-time removal data is more than or equal to 1000kg/h, the oxygen supply fan 2 can be automatically started to be switched from a natural oxidation mode to a forced oxidation mode, and the power consumption of the desulfurization plant can be reduced and the related operation and maintenance costs can be reduced on the basis of ensuring the operation safety of the unit through the start-stop control of the oxygen supply fan 2.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (5)
1. The utility model provides an automatic device that opens and stops of wet flue gas desulfurization oxidation fan, includes wet flue gas desulfurization tower (1), send oxygen fan (2), circulating pump (8) and controller (13), its characterized in that: one side of wet flue gas desulfurization tower (1) is provided with oxygen supply fan (2), the end of giving vent to anger of oxygen supply fan (2) is connected with oxidation tuber pipe (3), oxidation tuber pipe (3) and annular pipe (4) of setting installation in wet flue gas desulfurization tower (1), four oxidation wind nozzle (5) are installed to the bottom of annular pipe (4), agitator (7) are just installed to four oxidation wind nozzle (5) to the interior bottom of wet flue gas desulfurization tower (1), install into tobacco pipe (11) one side of wet flue gas desulfurization tower (1), install smoke flowmeter (12) and former cigarette sulfur dioxide flowmeter (16) on advancing tobacco pipe (11), blast pipe (15) are installed at the top of wet flue gas desulfurization tower (1), install clean cigarette sulfur dioxide flowmeter (17) on blast pipe (15).
2. The automatic start-stop device for the wet desulphurization oxidation fan as claimed in claim 1, characterized in that: and an atomizer (14) is arranged at the top of the interior of the wet desulphurization tower (1).
3. The automatic start-stop device for the wet desulphurization oxidation fan according to claim 1, characterized in that: one side of wet flue gas desulfurization tower (1) is provided with circulating pump (8), the end of intaking of circulating pump (8) communicates with the bottom of wet flue gas desulfurization tower (1), circulating pipe (9) are installed to the play water end of circulating pump (8), the top of circulating pipe (9) with violently insert and establish shower (10) of establishing in wet flue gas desulfurization tower (1) inside and be connected, shower (10) bottom evenly is provided with oxidizing wind nozzle (5).
4. The automatic start-stop device for the wet desulphurization oxidation fan according to claim 1, characterized in that: and a check valve (6) is installed on the oxidation air pipe (3), and the exhaust pipe (15) is connected with an external dust remover.
5. The automatic start-stop device for the wet desulphurization oxidation fan according to claim 1, characterized in that: install controller (13) on the outer wall of wet flue gas desulfurization tower (1), flue gas flowmeter (12), former cigarette sulfur dioxide flowmeter (16) and clean cigarette sulfur dioxide flowmeter (17) pass through wire and controller (13) electric connection, controller (13) pass through wire and send oxygen fan (2) electric connection.
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