CN104174262A - Internal-external water circulation system and technique for flue gas desulfurization - Google Patents
Internal-external water circulation system and technique for flue gas desulfurization Download PDFInfo
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- CN104174262A CN104174262A CN201410402591.5A CN201410402591A CN104174262A CN 104174262 A CN104174262 A CN 104174262A CN 201410402591 A CN201410402591 A CN 201410402591A CN 104174262 A CN104174262 A CN 104174262A
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Abstract
The invention relates to an internal-external water circulation system and technique for flue gas desulfurization. A flue gas desulfurization device and an internal-external water circulation device are arranged in a matched manner; the flue gas desulfurization device is provided with a primary desulfurization barrel, multiple secondary desulfurization barrels, a final desulfurization barrel which are communicated with one another; the secondary desulfurization barrels are successively arranged behind the primary desulfurization barrel side by side; through matching an external circulation pool, an internal circulation pool, an external circulation pump and an internal circulation pump of the internal-external water circulation device, desulfurization water is introduced to different circulation pools; the two circulation pools can be communicated with each other under certain conditions; and the water for desulfurization in the two circulation pools is sufficiently reutilized through the two circulation pumps. According to the internal-external water circulation system and technique for flue gas desulfurization, the desulfurization water can be sufficiently recycled; the desulfurization efficiency is improved; ash slag is deposited in the external circulation pool; settled water is recycled; circulation water pipes and sprayers are unlikely to be blocked; both the loads of the external and internal circulation pools are alleviated; the water circulation pumps are unlikely to wear; the service life is prolonged; and the maintenance cost is reduced and the desulfurization effect is good, the environment-friendly effect is realized.
Description
Technical field
The invention belongs to the separation of gas or steam; From gas, reclaim the steam of volatile solvent; Waste gas is the technical field of engine exhaust, flue gas, smog, flue gas, aerocolloidal chemistry or biological cleaning for example, particularly a kind of by the interior circulation of desulfurization water and external circulating system are set in flue gas desulfur device for more rationally carrying out the longer flue gas desulfurization water storing tank of smoke gas treatment and whole service life and flue gas desulfurization water inner-outer circulation technique simultaneously.
Background technology
Flue gas desulfurization refers to remove the process of oxysulfide (sulfur dioxide, sulfur trioxide etc.) from flue gas or other industrial waste gases.Flue gas desulfurization has another name called Flue gas desulfurization, be called for short FGD, in FGD technology, press the kind of desulfurizing agent and divide, can be divided into and take CaCO3(lime stone) for basic calcium method, take MgO as basic magnesium method, take Na2SO3 as basic sodium method, take NH3 as basic ammonia process and take organic base as basic organic alkaline process.
The dry and wet state in sweetening process according to absorbent and desulfurization product, desulfur technology is mainly divided into wet method, dry method and half-dried (half is wet) method.Wherein, Wet Flue Gas Desulfurization Technology is the desulfurization and process desulfurization product under wet condition of the solution that contains absorbent or slurries, and this method has that desulphurization reaction speed is fast, equipment simple, desulfuration efficiency advantages of higher, is the sulfur method of commonly using.
Yet, existing common desulfurization water circulation system only has internal circulation system or only has external circulating system, more only there is internal circulation system, the desulfurization water of all desulfurization cylinders is all toward by circulating pump, the desulfurization water recycle in circulatory pool to the shower nozzle of desulfurization cylinder top being carried out to desulfurization spraying operation after collecting in a circulatory pool, but only there is internal circulation system can allow lime-ash deposit at interior circulatory pool, serious circulating water pipe and the shower nozzle of stopping up, and only have external circulating system can allow detritus tank load excessive, affect usually effect, thereby stop up circulating water pipe and shower nozzle, when serious, also can produce heavy wear to water circulating pump.Single desulfurization water circulation system has not only reduced operating efficiency, has made integral device minimizing in service life, has increased maintenance cost, more affects desulfurized effect simultaneously, indirectly environment is worked the mischief.
Summary of the invention
The technical problem that the present invention solves is, in prior art, desulfurization water circulation system only has internal circulation system or only has external circulating system, and the internal circulation system that only has causing can allow lime-ash deposit at interior circulatory pool, serious circulating water pipe and the shower nozzle of stopping up, and only have external circulating system can allow detritus tank load excessive, affect sedimentation effect, thereby stop up circulating water pipe and shower nozzle, when serious, also can produce heavy wear to water circulating pump, single desulfurization water circulation system has not only reduced operating efficiency, make integral device minimizing in service life, increase maintenance cost, more affect desulfurized effect simultaneously, the problem indirectly environment being worked the mischief, and then a kind of flue gas desulfurization water storing tank and flue gas desulfurization water inner-outer circulation technique of optimization are provided.
The technical solution adopted in the present invention is, a kind of flue gas desulfurization water storing tank, comprise the water inner-outer circulation device and the flue gas desulfur device that are equipped with, described flue gas desulfur device comprises elementary desulfurization cylinder, some secondary desulfurization cylinders of being located at side by side in turn after elementary desulfurization cylinder, be located at the final stage desulfurization cylinder after secondary desulfurization cylinder and be located at the dehydration tube after final stage desulfurization cylinder, described elementary desulfurization cylinder, secondary desulfurization cylinder, final stage desulfurization cylinder and dehydration tube space are communicated with, described elementary desulfurization cylinder, secondary desulfurization cylinder and final stage desulfurization cylinder inner and upper are provided with shower nozzle, described elementary desulfurization cylinder sidewall is provided with smoke inlet, described dehydration tube sidewall is provided with exhanst gas outlet, outer circulation pump, internal circulation pump that described water inner-outer circulation device comprises outer circulation pond, interior circulatory pool and coordinates described outer circulation pond, interior circulatory pool to arrange, be provided with blocking part between described outer circulation pond and interior circulatory pool, and the top of described blocking part is provided with notch, described elementary desulfurization cylinder connects outer circulation pond by pipeline, circulatory pool in described secondary desulfurization cylinder, final stage desulfurization cylinder and dehydration tube are connected by pipeline, described outer circulation pump is connected with the shower nozzle of final stage desulfurization cylinder inside by circulating water pipe, and described internal circulation pump is connected with the shower nozzle on elementary desulfurization cylinder and secondary desulfurization cylinder by circulating water pipe.
Preferably, bottom, described outer circulation pond is provided with precipitation portion.
Preferably, the rear portion of described precipitation portion is provided with overfall.
Preferably, described outer circulation pond is provided with desulfurization slag cleaning plant.
Preferably, described elementary desulfurization cylinder, be somely located at side by side in turn secondary desulfurization cylinder after elementary desulfurization cylinder, be located at the final stage desulfurization cylinder after secondary desulfurization cylinder and be located between the dehydration tube after final stage desulfurization cylinder staggered being provided with from first baffler arranging top down of flue gas desulfur device or the second baffler upwards arranging from the bottom of flue gas desulfur device respectively, between the bottom of described the first baffler and flue gas desulfur device, be provided with space, between the top of described the second baffler and flue gas desulfur device, be provided with space.
Preferably, described smoke inlet is located on the first baffler is connected side with top or second baffler of flue gas desulfur device elementary desulfurization cylinder sidewall with the bottom of flue gas desulfur device.
Preferably, described exhanst gas outlet is located at the first baffler and is connected on the dehydration tube sidewall of side with the bottom of flue gas desulfur device with top or second baffler of flue gas desulfur device.
Preferably, described interior circulatory pool inside is provided with mixer.
A flue gas desulfurization water inner-outer circulation technique that adopts flue gas desulfurization water storing tank, described technique comprises the following steps:
Step 1: insert clear water in interior circulatory pool, open internal circulation pump, internal circulation pump is sent to the shower nozzle on elementary desulfurization cylinder and secondary desulfurization cylinder by the clear water in interior circulatory pool by circulating water pipe, spray desulfurization water;
Step 2: the flue gas with oxysulfide passes into elementary desulfurization cylinder by smoke inlet, desulfuration operations starts, desulfurization water and the preliminary desulfurization of flue gas effect, the buck of desulfurization flow to outer circulation pond by pipeline and precipitates, desulfurization slag is finally gathered in precipitation portion, and supernatant water enters interior circulatory pool by the upper notch of blocking part;
Step 3: flue gas in elementary desulfurization cylinder after elementary desulfurization, by the first baffler or the second baffler and elementary desulfurization cylinder and the top of secondary desulfurization cylinder or the gap of bottom, enter secondary desulfurization cylinder and continue desulfurization, desulfurization water sprays and flue gas continuation effect desulfurization by shower nozzle; The desulfurization water of secondary desulfurization cylinder flow to interior circulatory pool by pipeline; Open outer circulation pump, outer circulation pump is sent to the shower nozzle on final stage desulfurization cylinder by the supernatant water in outer circulation pond by circulating water pipe simultaneously, spray desulfurization water;
Step 4: flue gas in secondary desulfurization cylinder through after desulfurization again, by the first baffler or the second baffler and secondary desulfurization cylinder and the top of final stage desulfurization cylinder or the gap of bottom, enter final stage desulfurization cylinder and continue desulfurization, desulfurization water sprays and flue gas continuation effect desulfurization by shower nozzle; The desulfurization water of final stage desulfurization cylinder flow to interior circulatory pool by pipeline;
Step 5: flue gas after final desulfurization, enters dehydration tube by the first baffler or the second baffler and the top of final stage desulfurization cylinder and dehydration tube or the gap of bottom and dewaters in final stage desulfurization cylinder; Moisture in flue gas in dehydration tube flow to interior circulatory pool by pipeline after departing from;
Step 6: the mixer in starting in circulatory pool, and add alkaline solution in interior circulatory pool, by internal circulation pump, the solution in interior circulatory pool is squeezed into elementary desulfurization cylinder and secondary desulfurization cylinder;
Step 7: flue gas, from the exhanst gas outlet pass-out of dehydration tube, completes flue gas desulfurization.
The invention provides a kind of flue gas desulfurization water storing tank and flue gas desulfurization water inner-outer circulation technique of optimization, by be equipped with the water inner-outer circulation device that comprises interior circulation and outer circulation for flue gas desulfur device, flue gas desulfur device arranges the elementary desulfurization cylinder that space is communicated with, some secondary desulfurization cylinders of being located at side by side in turn after elementary desulfurization cylinder, be located at the final stage desulfurization cylinder after secondary desulfurization cylinder and be located at the dehydration tube after final stage desulfurization cylinder, by the outer circulation pond with water inner-outer circulation device, interior circulatory pool and cooperation outer circulation pond, the outer circulation pump that interior circulatory pool arranges, internal circulation pump coordinates, desulfurization water is introduced in different circulatory pools, two circulatory pools can circulate mutually under certain condition, and by two circulations, the desulfurization water in two circulatory pools is recycled fully, the invention enables desulfurization water fully to recycle, improve desulfuration efficiency, lime-ash outside circulatory pool precipitates, and supernatant water carries out water circulation, and circulating water pipe and shower nozzle are difficult for stopping up, outer circulation pond and interior circulatory pool load reduce, water circulating pump is not easy to wear, and extend service life, and maintenance cost reduces, and desulfurized effect is better, environmental protection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention that 1 secondary desulfurization cylinder is set;
Fig. 2 is the working state schematic representation of the present invention that 1 secondary desulfurization cylinder is set, solid arrow represent circulating water flow to, dotted arrow represents flue gas flow direction.
The specific embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but protection scope of the present invention is not limited to this.
As shown in the figure, the present invention relates to a kind of flue gas desulfurization water storing tank, comprise the water inner-outer circulation device and the flue gas desulfur device that are equipped with, described flue gas desulfur device 1 comprises elementary desulfurization cylinder 2, some secondary desulfurization cylinders 3 of being located at side by side in turn after elementary desulfurization cylinder 2, be located at the final stage desulfurization cylinder 4 after secondary desulfurization cylinder 3 and be located at the dehydration tube 5 after final stage desulfurization cylinder 4, described elementary desulfurization cylinder 2, secondary desulfurization cylinder 3, final stage desulfurization cylinder 4 and dehydration tube 5 spaces are communicated with, described elementary desulfurization cylinder 2, secondary desulfurization cylinder 3 and final stage desulfurization cylinder 4 inner and upper are provided with shower nozzle 6, described elementary desulfurization cylinder 2 sidewalls are provided with smoke inlet 7, described dehydration tube 5 sidewalls are provided with exhanst gas outlet 8, outer circulation pump 11, internal circulation pump 12 that described water inner-outer circulation device comprises outer circulation pond 9, interior circulatory pool 10 and coordinates described outer circulation pond 9, interior circulatory pool 10 to arrange, 10 of described outer circulation pond 9 and interior circulatory pools are provided with blocking part 13, and the top of described blocking part 13 is provided with notch, described elementary desulfurization cylinder 2 connects outer circulation pond 9 by pipeline 14, circulatory pool 10 in described secondary desulfurization cylinder 3, final stage desulfurization cylinder 4 and dehydration tube 5 are connected by pipeline 14, described outer circulation pump 11 is connected with the shower nozzle 6 of final stage desulfurization cylinder 4 inside by circulating water pipe 15, and described internal circulation pump 12 is connected with the shower nozzle 6 on elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3 by circulating water pipe 15.
In the present invention, flue gas desulfurization water inner-outer circulation device comprises water inner-outer circulation device and the flue gas desulfur device 1 being equipped with, wherein flue gas desulfur device 1 is mainly to carry out the parts of flue gas desulfurization operation, and water inner-outer circulation device is to coordinate the structure setting of flue gas desulfur device 1 to complete the interior circulation of desulfurization water and the device of outer circulation with interior circulation and outer circulation.
In the present invention, flue gas desulfur device 1 comprises elementary desulfurization cylinder 2, is somely located at side by side in turn secondary desulfurization cylinder 3 after elementary desulfurization cylinder 2, is located at the final stage desulfurization cylinder 4 after secondary desulfurization cylinder 3 and is located at the dehydration tube 5 after final stage desulfurization cylinder 4, and elementary desulfurization cylinder 2, secondary desulfurization cylinder 3, final stage desulfurization cylinder 4 and dehydration tube 5 spaces are communicated with, and described elementary desulfurization cylinder 2, secondary desulfurization cylinder 3 and final stage desulfurization cylinder 4 inner and upper are provided with shower nozzle 6.Wherein, elementary desulfurization cylinder 2 is as first desulfurization, water base of now desulfurization is all buck, and in secondary desulfurization cylinder 3 when carrying out desulfurization through the flue gas of elementary desulfurization cylinder 2, sulfide in flue gas is considerably less, therefore can the number of secondary desulfurization cylinder 3 need to be set according to actual desulfurization, and final stage desulfurization cylinder 4 that meaning is set is basic consistent with secondary desulfurization cylinder 3, in order to carry out further desulfuration operations for flue gas to be desulfurization; Dehydration tube 5 is mainly used in the flue gas after wet desulphurization to carry out dewatering operation, to guarantee the flue gas quality of output.
In the present invention, water inner-outer circulation device comprises outer circulation pond 9, interior circulatory pool 10 and cooperation outer circulation pond 9, the outer circulation pump 11 that interior circulatory pool 10 arranges, internal circulation pump 12, 10 of outer circulation pond 9 and interior circulatory pools are provided with the blocking part 13 that top is provided with notch, be that water in outer circulation pond 9 can be by the effect of outer circulation pump 11 other place of leading, water in interior circulatory pool 10 can be by the effect of internal circulation pump 12 other place of leading, and the water in outer circulation pond 9 can flow to via the notch of blocking part 13 tops interior circulatory pool 10 simultaneously, complete the cyclic process of desulfurization water.Simultaneously, elementary desulfurization cylinder 2 connects outer circulation pond 9 by pipeline 14, secondary desulfurization cylinder 3, circulatory pool 10 in final stage desulfurization cylinder 4 is connected by pipeline 14 with dehydration tube 5, have a large amount of grey current direction outer circulation ponds 9, buck is the interior precipitation of circulatory pool 9 outside, circulatory pool 10 in the supernatant current direction obtaining after precipitation, and the secondary desulfurization cylinder 3 of relative clean, the desulfurization water of final stage desulfurization cylinder 4 and dehydration tube 5 can flow to interior circulatory pool 10 and be directly used in recirculation, this structure has solved circulating water pipe 15 and shower nozzle 6 cloggings, at circulating water pipe 15, internal circulation pump 12 and the 11 interior work of outer circulation pump be all cleaner desulfurization water, service life of the present invention and desulfurized effect have been guaranteed.
In the present invention, outer circulation pump 11 is connected with the shower nozzle 6 of final stage desulfurization cylinder 4 inside by circulating water pipe 15, internal circulation pump 12 is connected with the shower nozzle 6 on elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3 by circulating water pipe 15, the water that is the relative clean in internal circulation pump 12 directly acts on the flue gas of elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3 by the shower nozzle 6 on elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3, and buck in outer circulation pond 9 is due to certain supernatant time of needs, pretend the flue gas that acts on final stage desulfurization cylinder 4 for the shower nozzle 6 by final stage desulfurization cylinder 4, guaranteed the reasonable in order of desulfuration operations, and completed inner-outer circulation, guarantee the reasonable domination of desulfurization water, energy-conserving and environment-protective.
Described elementary desulfurization cylinder 2, be somely located at side by side in turn secondary desulfurization cylinder 3 after elementary desulfurization cylinder 2, be located at the final stage desulfurization cylinder 4 after secondary desulfurization cylinder 3 and be located at 5 of dehydration tubes after final stage desulfurization cylinder 4 staggered being provided with from the first baffler 16-1 arranging top down of flue gas desulfur device 1 or the second baffler 16-2 upwards arranging from the bottom of flue gas desulfur device 1 respectively, between the bottom of described the first baffler 16-1 and flue gas desulfur device 1, be provided with space, between the top of described the second baffler 16-2 and flue gas desulfur device 1, be provided with space.
In the present invention, when secondary desulfurization cylinder 3 is set to 1, elementary desulfurization cylinder 2 and 3, secondary desulfurization cylinder are provided with between the bottom of the first baffler 16-1 arranging top down and the first baffler 16-1 and elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3 and are provided with space, be that flue gas is from passing into after elementary desulfurization cylinder 2 outward, from shower nozzle 6, watered the desulfurization water falling and reacted, carry out desulfuration operations, and due to the trend of flue gas upward, top-down desulfurization water equals to have contacted greatly flue gas, what make that desulfuration operations carries out is more abundant, flue gas after desulfurization marches to secondary desulfurization cylinder 3 by the space between the bottom of the first baffler 16-1 and elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3 from elementary desulfurization cylinder 2, secondary desulfurization cylinder 3 and 4, final stage desulfurization cylinder are provided with from bottom and make progress and be provided with space between the second baffler 16-2 of setting and the top of the second baffler 16-2 and secondary desulfurization cylinder 3 and final stage desulfurization cylinder 4, be that flue gas enters after secondary desulfurization cylinder 3 from elementary desulfurization cylinder 2, from shower nozzle 6, watered the desulfurization water falling and carried out desulfuration operations, and due to the trend of flue gas upward, top-down desulfurization water equals to have contacted greatly flue gas, what make that the desulfuration operations of secondary desulfurization cylinder 3 carries out is more abundant, flue gas after desulfurization marches to final stage desulfurization cylinder 4 by the space between the top of the second baffler 16-2 and secondary desulfurization cylinder 3 and final stage desulfurization cylinder 4 from secondary desulfurization cylinder 3, 5 of final stage desulfurization cylinder 4 and dehydration tubes are provided with between the bottom of the first baffler 16-1 arranging top down and the first baffler 16-1 and final stage desulfurization cylinder 4 and dehydration tube 5 and are provided with space, now flue gas carries out similar in the principle of desulfuration operations and elementary desulfurization cylinder 2, just now the sulfide content in flue gas is very low, final stage desulfurization cylinder 4 is final confirmations of desulfuration operations, guarantees that the content of sulfide in flue gas is low as far as possible, final flue gas carries out final dewatering operation by dehydration tube 5.
Be more than the simplest embodiment of the present invention, in the present invention, it is a plurality of that secondary desulfurization cylinder 3 can be set to, and the first baffler 16-1 and the second baffler 16-2 there is no order is successively set simultaneously, only needs to guarantee to be crisscross arranged.
In the present invention, generally the first baffler 16-1 and the second baffler 16-2 be arranged in parallel.
Described smoke inlet 7 is located at the first baffler 16-1 and is connected with the bottom of flue gas desulfur device 1 on elementary desulfurization cylinder 2 sidewalls of side with top or the second baffler 16-2 of flue gas desulfur device 1.
In the present invention, in order to guarantee to be with sulphur flue gas energy fully and reactive desulfurizing agent, smoke inlet 7 is generally located at the first baffler 16-1 and is connected with the bottom of flue gas desulfur device 1 on elementary desulfurization cylinder 2 sidewalls of side with top or the second baffler 16-2 of flue gas desulfur device 1, be that flue gas is from passing into after vertical desulfurization cylinder outward, from shower nozzle 6, watered the desulfurization water falling and carried out desulfuration operations, and due to the trend of flue gas upward, top-down desulfurization water equals to have contacted greatly flue gas, and what make that desulfuration operations carries out is more abundant.
Described exhanst gas outlet 8 is located at the first baffler 16-1 and is connected on dehydration tube 5 sidewalls of side with the bottom of flue gas desulfur device 1 with top or the second baffler 16-2 of flue gas desulfur device 1.
In the present invention, in order to guarantee to be with sulphur flue gas energy fully and reactive desulfurizing agent, exhanst gas outlet is located at the first baffler 16-1 and is connected on dehydration tube 5 sidewalls of side with the bottom of flue gas desulfur device 1 with top or the second baffler 16-2 of flue gas desulfur device 1, guarantees that flue gas can be in the interior abundant dehydration of dehydration tube 5 until reach exhanst gas outlet 8 places.
9 bottoms, described outer circulation pond are provided with precipitation portion.
In the present invention, 9 bottoms, outer circulation pond arrange precipitation portion, lime-ash after precipitating can be more firmly fixed in precipitation portion, and minimizing causes the interior lime-ash in outer circulation pond 9 to rise and fall, roll and then have influence on the supernatant water of outer circulation pond 9 and interior circulatory pool 10 supernatant water mobile and outer circulation pond 9 because of the motion of current produces heavy wear to water circulating pump while being reused by outer circulation pump 11.
The rear portion of described precipitation portion is provided with overfall.
In the present invention, for the lime-ash that in time scavenger precipitation portion goes out, at the sidepiece of precipitation portion, overfall is set, lime-ash can be transported in time when needs are processed, guaranteed that the supernatant water in outer circulation pond 9 can as much as possiblely be utilized in the process of outer circulation.
Described outer circulation pond 9 is provided with desulfurization slag cleaning plant.
In the present invention, can adopt variety of way immediately to obtain the lime-ash information of precipitation portion, the assurance lime-ash not precipitation portion of circulatory pool 9 accumulation outside too much has influence on normally carrying out of technique of the present invention, does not also shorten the service life of system of the present invention.
In the present invention, when lime-ash runs up to when a certain amount of, must carry out desulfurization slag prune job.Generally, desulfurization slag cleaning plant can be set to the form of compression pump and forcing press cooperation, after clearing out desulfurization slag by compression pump, by forcing press, further desulfurization slag is processed, after can also being set to slurries to shunt, by forcing press, desulfurization slag is carried out again next step processing in cyclone.
Be more than the simplest embodiment of the present invention, in actual job process, can be according to actual demand to the further process of refinement of the prune job of desulfurization slag.
Described interior circulatory pool 10 inside are provided with mixer.
In the present invention, by interior circulatory pool 10 inside, mixer being set, in guaranteeing, circulatory pool 10 inside do not produce the phenomenon of caking, guarantee the working properly of internal circulation pump 12, internal circulation pump 12 is not easy to wear, and extend service life, maintenance cost reduces, and desulfurized effect is better, environmental protection.
Processing step of the present invention is as follows:
Step 1: insert clear water in interior circulatory pool 10, open internal circulation pump 12, internal circulation pump 12 is sent to the shower nozzle 6 on elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3 by the clear water in interior circulatory pool 10 by circulating water pipe 15, spray desulfurization water;
Step 2: the flue gas with oxysulfide passes into elementary desulfurization cylinder 2 by smoke inlet 7, desulfuration operations starts, desulfurization water and the preliminary desulfurization of flue gas effect, the buck of desulfurization flow to outer circulation pond 9 by pipeline 14 and precipitates, desulfurization slag is finally gathered in precipitation portion, and supernatant water enters interior circulatory pool 10 by the upper notch of blocking part 13;
Step 3: flue gas is interior after elementary desulfurization at elementary desulfurization cylinder 2, by the first baffler 16-1 or the second baffler 16-2 and elementary desulfurization cylinder 2 and the top of secondary desulfurization cylinder 3 or the gap of bottom, enter secondary desulfurization cylinder 3 and continue desulfurization, desulfurization water sprays and flue gas continuation effect desulfurization by shower nozzle 6; The desulfurization water of secondary desulfurization cylinder 3 flow to interior circulatory pool 10 by pipeline 14; Open outer circulation pump 11, outer circulation pump 11 is sent to the shower nozzle 6 on final stage desulfurization cylinder 4 by the supernatant water in outer circulation pond 9 by circulating water pipe 15 simultaneously, spray desulfurization water;
Step 4: flue gas is interior through after desulfurization again at secondary desulfurization cylinder 3, by the first baffler 16-1 or the second baffler 16-2 and secondary desulfurization cylinder 3 and the top of final stage desulfurization cylinder 4 or the gap of bottom, enter final stage desulfurization cylinder 4 and continue desulfurization, desulfurization water sprays and flue gas continuation effect desulfurization by shower nozzle 6; The desulfurization water of final stage desulfurization cylinder 4 flow to interior circulatory pool 10 by pipeline 14;
Step 5: flue gas is interior after final desulfurization at final stage desulfurization cylinder 4, enters dehydration tube 5 by the first baffler 16-1 or the second baffler 16-2 and final stage desulfurization cylinder 4 and the top of dehydration tube 5 or the gap of bottom and dewaters; Moisture in flue gas in dehydration tube 5 flow to interior circulatory pool 10 by pipeline 14 after departing from;
Step 6: the mixer in starting in circulatory pool 10, and at the interior interpolation alkaline solution of interior circulatory pool 10, by internal circulation pump 12, the solution in interior circulatory pool 10 is squeezed into elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3;
Step 7: flue gas, from exhanst gas outlet 8 pass-outs of dehydration tube 5, completes flue gas desulfurization.
In the present invention, step 1 guarantees before flue gas desulfurization operation starts, whole water inner-outer circulation device is started working, flue gas desulfur device 1 is by moistening, make flue gas can carry out in time flue gas desulfurization operation once entering flue gas desulfur device 1, make just can get rid of most sulfur-containing compounds in elementary desulfurization cylinder 2.
In the present invention, in step 2, the buck of desulfurization flow to outer circulation pond 9 by pipeline 14 and precipitates, desulfurization slag is finally gathered in 9 bottoms, outer circulation pond, the interior precipitation portion that arranges of circulatory pool 9 outside herein, make lime-ash can more firmly precipitate soon, assemble, the desulfurization water after supernatant can enter by the notch on blocking part 13 tops interior circulatory pool 10; Meanwhile, the supernatant water in outer circulation pond 9 also needs to be used in outer circulation.
In the present invention, in step 3, the desulfurization water of secondary desulfurization cylinder 3 flow to interior circulatory pool 10 by pipeline 14, and desulfurization water relative clean now, can directly be re-used in interior circulation.
In the present invention, in step 3, open outer circulation pump 11 simultaneously, the basic supernatant of buck in outer circulation pond 9 now, therefore can utilize outer circulation pump 11 that the supernatant water in outer circulation pond 9 is sent to shower nozzle 6 on final stage desulfurization cylinder 4 with spray desulfurization water by circulating water pipe 15, complete the flue gas desulfurization operation of final stage.
In the present invention, in step 4, the desulfurization water of secondary desulfurization cylinder 3 flow to interior circulatory pool 10 by pipeline 14, and desulfurization water relative clean now, can directly be re-used in interior circulation.
In the present invention, in step 5, the desulfurization water of final stage desulfurization cylinder 4 and dehydration tube 5 flow to interior circulatory pool 10 by pipeline 14, and desulfurization water relative clean now, can directly be re-used in interior circulation.
In the present invention, in step 3, step 4 and step 5, the desulfurization water of secondary desulfurization cylinder 3, final stage desulfurization cylinder 4 and dehydration tube 5 all flows into interior circulatory pool 10, due to water base supernatant of the desulfurization in interior circulatory pool 10, therefore can utilize internal circulation pump 12 that the desulfurization water in interior circulatory pool 10 is sent to shower nozzle 6 on elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3 to spray desulfurization water again by circulating water pipe 15, form recycling of desulfurization water when completing flue gas desulfurization operation.
In the present invention, mixer in starting in step 6 in circulatory pool 10, and at the interior interpolation alkaline solution of interior circulatory pool 10, make interior circulatory pool 10 inside not produce the phenomenon of caking, guarantee the working properly of internal circulation pump 12, internal circulation pump 12 is not easy to wear, extend service life, maintenance cost reduces, and desulfurized effect is better, environmental protection.
In the present invention, the alkaline solution of addressing in step 6 is generally desulfurizing agent, as lime, lime stone and with the preparation of calcium carbonate medicament or soda, magnesia and other can do the alkaline solution of desulfurizing agent.
In technique of the present invention, the flow direction of recirculated water is: the buck that elementary desulfurization cylinder 2 desulfurization produce flows into outer circulation pond 9 and precipitates, heavy clean water overflow enters in interior circulatory pool 10, circulatory pool 10 in the water of secondary desulfurization cylinder 3, final stage desulfurization cylinder 4 and dehydration tube 5 flows into, by internal circulation pump 12, be circulated back to elementary desulfurization cylinder 2 and secondary desulfurization cylinder 3, and outer circulation pump 11 is got back to final stage desulfurization cylinder 4 by the supernatant water alone cycle in outer circulation pond 9.
Technique of the present invention can recycle desulfurization water, does not have waste water to discharge.After desulfurization slag precipitation, can regularly clear up and transport, safety, convenient, environmental protection.
In the present invention, outer circulation pump 11 and internal circulation pump 12 can be controlled by control circuit, via control circuit, calculate the operation of having controlled opening and closing, make the opportunity of the sprinkling desulfurization water in elementary desulfurization cylinder 2, secondary desulfurization cylinder 3 and final stage desulfurization cylinder 4 more appropriate, guaranteed that outer circulation pump 11 can not opened too early simultaneously and water circulating pump is produced to heavy wear.
In the present invention, control circuit can be according to those skilled in the art to controlling the understanding setting of outer circulation pump 11 and internal circulation pump 12.
The invention solves in prior art, desulfurization water circulation system only has internal circulation system or only has external circulating system, and the internal circulation system that only has causing can allow lime-ash in interior circulatory pool 10 depositions, serious circulating water pipe 15 and the shower nozzle 6 of stopping up, and only have external circulating system can allow detritus tank load excessive, affect usually effect, thereby stop up circulating water pipe 15 and shower nozzle 6, when serious, also can produce heavy wear to water circulating pump, single desulfurization water circulation system has not only reduced operating efficiency, make integral device minimizing in service life, increase maintenance cost, more affect desulfurized effect simultaneously, the problem indirectly environment being worked the mischief, by being equipped with for flue gas desulfur device 1 the water inner-outer circulation device that comprises interior circulation and outer circulation, flue gas desulfur device 1 arranges the elementary desulfurization cylinder 2 that space is communicated with, some secondary desulfurization cylinders 3 of being located at side by side in turn after elementary desulfurization cylinder 2, be located at the final stage desulfurization cylinder 4 after secondary desulfurization cylinder 3 and be located at the dehydration tube 5 after final stage desulfurization cylinder 4, by the outer circulation pond 9 with water inner-outer circulation device, interior circulatory pool 10 and cooperation outer circulation pond 9, the outer circulation pump 11 that interior circulatory pool 10 arranges, internal circulation pump 12 coordinates, desulfurization water is introduced in different circulatory pools, two circulatory pools can circulate mutually under certain condition, and by two circulations, the desulfurization water in two circulatory pools is recycled fully, the invention enables desulfurization water fully to recycle, improve desulfuration efficiency, lime-ash outside circulatory pool 9 precipitates, and supernatant water carries out water circulation, and circulating water pipe 15 and shower nozzle 6 are difficult for stopping up, outer circulation pond 9 and interior circulatory pool 10 loads reduce, water circulating pump is not easy to wear, and extend service life, and maintenance cost reduces, and desulfurized effect is better, environmental protection.
Claims (9)
1. a flue gas desulfurization water storing tank, comprise the water inner-outer circulation device and the flue gas desulfur device that are equipped with, it is characterized in that: described flue gas desulfur device comprises elementary desulfurization cylinder, some secondary desulfurization cylinders of being located at side by side in turn after elementary desulfurization cylinder, be located at the final stage desulfurization cylinder after secondary desulfurization cylinder and be located at the dehydration tube after final stage desulfurization cylinder, described elementary desulfurization cylinder, secondary desulfurization cylinder, final stage desulfurization cylinder and dehydration tube space are communicated with, described elementary desulfurization cylinder, secondary desulfurization cylinder and final stage desulfurization cylinder inner and upper are provided with shower nozzle, described elementary desulfurization cylinder sidewall is provided with smoke inlet, described dehydration tube sidewall is provided with exhanst gas outlet, outer circulation pump, internal circulation pump that described water inner-outer circulation device comprises outer circulation pond, interior circulatory pool and coordinates described outer circulation pond, interior circulatory pool to arrange, be provided with blocking part between described outer circulation pond and interior circulatory pool, and the top of described blocking part is provided with notch, described elementary desulfurization cylinder connects outer circulation pond by pipeline, circulatory pool in described secondary desulfurization cylinder, final stage desulfurization cylinder and dehydration tube are connected by pipeline, described outer circulation pump is connected with the shower nozzle of final stage desulfurization cylinder inside by circulating water pipe, and described internal circulation pump is connected with the shower nozzle on elementary desulfurization cylinder and secondary desulfurization cylinder by circulating water pipe.
2. a kind of flue gas desulfurization water storing tank according to claim 1, is characterized in that: bottom, described outer circulation pond is provided with precipitation portion.
3. a kind of flue gas desulfurization water storing tank according to claim 2, is characterized in that: the rear portion of described precipitation portion is provided with overfall.
4. a kind of flue gas desulfurization water storing tank according to claim 1, is characterized in that: described outer circulation pond is provided with desulfurization slag cleaning plant.
5. a kind of flue gas desulfurization water storing tank according to claim 1, it is characterized in that: described elementary desulfurization cylinder, some secondary desulfurization cylinders of being located at side by side in turn after elementary desulfurization cylinder, be located at the final stage desulfurization cylinder after secondary desulfurization cylinder and be located between the dehydration tube after final stage desulfurization cylinder and interlock respectively and be provided with from first baffler arranging top down of flue gas desulfur device or the second baffler upwards arranging from the bottom of flue gas desulfur device, between the bottom of described the first baffler and flue gas desulfur device, be provided with space, between the top of described the second baffler and flue gas desulfur device, be provided with space.
6. a kind of flue gas desulfurization water storing tank according to claim 5, is characterized in that: described smoke inlet is located on the first baffler is connected side with top or second baffler of flue gas desulfur device elementary desulfurization cylinder sidewall with the bottom of flue gas desulfur device.
7. a kind of flue gas desulfurization water storing tank according to claim 5, is characterized in that: described exhanst gas outlet is located at the first baffler and is connected on the dehydration tube sidewall of side with the bottom of flue gas desulfur device with top or second baffler of flue gas desulfur device.
8. a kind of flue gas desulfurization water storing tank according to claim 1, is characterized in that: described interior circulatory pool inside is provided with mixer.
9. a flue gas desulfurization water inner-outer circulation technique that adopts the flue gas desulfurization water storing tank described in claim 1～8, is characterized in that: described technique comprises the following steps:
Step 1: insert clear water in interior circulatory pool, open internal circulation pump, internal circulation pump is sent to the shower nozzle on elementary desulfurization cylinder and secondary desulfurization cylinder by the clear water in interior circulatory pool by circulating water pipe, spray desulfurization water;
Step 2: the flue gas with oxysulfide passes into elementary desulfurization cylinder by smoke inlet, desulfuration operations starts, desulfurization water and the preliminary desulfurization of flue gas effect, the buck of desulfurization flow to outer circulation pond by pipeline and precipitates, desulfurization slag is finally gathered in precipitation portion, and supernatant water enters interior circulatory pool by the upper notch of blocking part;
Step 3: flue gas in elementary desulfurization cylinder after elementary desulfurization, by the first baffler or the second baffler and elementary desulfurization cylinder and the top of secondary desulfurization cylinder or the gap of bottom, enter secondary desulfurization cylinder and continue desulfurization, desulfurization water sprays and flue gas continuation effect desulfurization by shower nozzle; The desulfurization water of secondary desulfurization cylinder flow to interior circulatory pool by pipeline; Open outer circulation pump, outer circulation pump is sent to the shower nozzle on final stage desulfurization cylinder by the supernatant water in outer circulation pond by circulating water pipe simultaneously, spray desulfurization water;
Step 4: flue gas in secondary desulfurization cylinder through after desulfurization again, by the first baffler or the second baffler and secondary desulfurization cylinder and the top of final stage desulfurization cylinder or the gap of bottom, enter final stage desulfurization cylinder and continue desulfurization, desulfurization water sprays and flue gas continuation effect desulfurization by shower nozzle; The desulfurization water of final stage desulfurization cylinder flow to interior circulatory pool by pipeline;
Step 5: flue gas after final desulfurization, enters dehydration tube by the first baffler or the second baffler and the top of final stage desulfurization cylinder and dehydration tube or the gap of bottom and dewaters in final stage desulfurization cylinder; Moisture in flue gas in dehydration tube flow to interior circulatory pool by pipeline after departing from;
Step 6: the mixer in starting in circulatory pool, and add alkaline solution in interior circulatory pool, by internal circulation pump, the solution in interior circulatory pool is squeezed into elementary desulfurization cylinder and secondary desulfurization cylinder;
Step 7: flue gas, from the exhanst gas outlet pass-out of dehydration tube, completes flue gas desulfurization.
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| CN104174262B (en) | 2017-02-01 |
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