CN214486373U - Modularization limestone wet flue gas desulfurization reaction unit - Google Patents
Modularization limestone wet flue gas desulfurization reaction unit Download PDFInfo
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- CN214486373U CN214486373U CN202022582540.9U CN202022582540U CN214486373U CN 214486373 U CN214486373 U CN 214486373U CN 202022582540 U CN202022582540 U CN 202022582540U CN 214486373 U CN214486373 U CN 214486373U
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Abstract
The utility model discloses a modularized limestone wet desulphurization reaction device, which relates to the technical field of flue gas desulphurization, and comprises a flue gas inlet channel, a desulphurization reaction module unit connected between an inlet and an outlet, and a flue gas outlet channel; the desulfurization reaction module unit is formed by vertically arranging a plurality of groups of mutually independent reaction module channels layer by layer, and each group of reaction module channels are in a channel structure which is formed by connecting a plurality of reaction modules which are detachably connected in pairs in series and is communicated along the flowing direction of flue gas; any one reaction module is provided with vertically arranged slurry spraying pipes at four corners of the inner cavity, the bottom of the reaction module is communicated with the reaction slurry collecting pipe, and each slurry spraying pipe is provided with a plurality of slurry nozzles which are vertically arranged at intervals; the inlet of the device is provided with an inlet adjusting baffle, and the outlet of the device is provided with an outlet adjusting baffle. The utility model discloses make desulfurization system's disposable construction can satisfy the whole running life of unit basically, reduce and reform transform the investment, and can satisfy the purification requirement of high sulfur flue gas.
Description
Technical Field
The utility model relates to a flue gas desulfurization technical field especially relates to a modularization lime stone wet flue gas desulfurization reaction unit.
Background
At present, the quality of fuel of thermal power generating units in China is gradually reduced, the probability of burning high-sulfur power coal is gradually increased, and the requirement on environment-friendly equipment is continuously improved. The existing mainstream desulfurization equipment and related process in the market have obvious shortage on the treatment capacity of the flue gas with high sulfur content under the condition of certain investment.
The existing flue gas desulfurization equipment, such as an FGD system, occupies about 90 percent of the market share, the main flue gas reaction vessel of the flue gas desulfurization equipment is a tower body, the occupied area of the equipment is large, and the system is complex. Because of the early development of the FGD system technology, there are many defects, such as: 1. in the actual operation process, the actual desulfurization efficiency is mostly lower than the designed value by 5-8% under the influence of uneven flow of the flue gas in the tower body, and when the sulfur content of the original flue gas exceeds 1000mg/Nm3In time, emission of thermal power generating unit reaches the standard and brings great significanceInfluence. 2. The existing desulfurization system is complex, a plurality of devices are needed for assisting when the wet desulfurization system operates, the consumption of service power is huge, for example, a domestic 600MW unit is taken as an example, if oxidation fan equipment occupies 20-30% of the common power rate, the energy consumption is high. 3. In the operation of equipment, because the flue gas sulfur content of different positions of different heights and the same height of the cross section in the tower body is difficult to monitor one by one, the working condition of a large-area nozzle can only be adjusted by adjusting the total slurry supply amount, fine adjustment is difficult to carry out, and the consumption of limestone is large.
In view of the above problems, many researchers have proposed improvements and optimization measures, such as: 1. the flue gas flow path in the tower body is optimized, so that the flue gas flow time is prolonged, the reaction time is increased, the efficiency is improved, but the improvement range is limited. 2. The pore plate is additionally arranged in the tower body, so that the smoke passes through the pore plate in the upward flowing process, the uneven degree of the flow velocity of the smoke is reduced, but the pressure difference is larger, the power consumption of an induced draft fan is increased, in operation, the situation that the pore plate is blocked is easily caused, and the adverse effect is brought to the combustion stability of boiler equipment when the blockage is serious. 3. The method can improve the flue gas desulfurization efficiency within a period of time by adding catalytic reactant materials into the limestone slurry, but the method has large increase on the operation cost after long-term operation, and is not beneficial to large-scale popularization.
Although there is a certain improvement, there is no device composed of unitized modules, which can flexibly cope with the sulfur content change in the flue gas.
Disclosure of Invention
Based on the technical problem that the background art exists, the utility model provides a low cost, be applicable to the modularization lime stone wet flue gas desulfurization reaction unit that different sulphur content flue gases contain.
The utility model provides a modularized limestone wet desulphurization reaction device, which comprises a flue gas inlet channel communicated with the inlet of the device, a desulphurization reaction module unit connected between the inlet and the outlet in the device and a flue gas outlet channel communicated with the outlet of the device in sequence along the flow direction of flue gas;
the desulfurization reaction module unit is formed by vertically arranging a plurality of groups of mutually independent reaction module channels layer by layer; each group of reaction modules has the same channel structure form, a plurality of reaction modules which are detachably connected in pairs are connected in series to form a channel structure which is communicated along the flowing direction of flue gas, and two reaction modules at two ends are respectively communicated with an inlet and an outlet of the device;
any reaction module is provided with slurry spray pipes which are vertically arranged at four corners of the inner cavity, the bottom of the reaction module is communicated with a reaction slurry collecting pipe, the upper pipe ends of the four slurry spray pipes are communicated with a slurry supply pipeline, slurry nozzles which have horizontal spraying directions and face the center of the inner cavity of the reaction module are arranged at equal heights, and each slurry spray pipe is provided with a plurality of slurry nozzles which are vertically arranged at intervals;
an inlet adjusting baffle is arranged at the inlet of the device, and the flue gas inlet channel can be communicated with at least one group of reaction module channels through the inlet adjusting baffle;
an outlet adjusting baffle is arranged at the outlet of the device, a demister is arranged at the position, close to the outlet adjusting baffle, of the flue gas outlet channel, and the demister can demist the flue gas flowing out of the desulfurization reaction module unit by using local plates or all plates through the outlet adjusting baffle.
Preferably, the reaction modules are of a cuboid shell structure, two side wall surfaces perpendicular to the flow direction of the flue gas are open, the bottoms of the reaction modules are gradually contracted to form conical buckets as slurry collecting buckets, and the reaction modules are converged to the reaction slurry collecting pipe through slurry outlet pipes at the bottoms of the corresponding slurry collecting buckets respectively.
Preferably, two slurry supply branch pipelines which are arranged in parallel along the flue gas flowing direction are respectively formed above each group of reaction module channels corresponding to the slurry supply pipelines, and each slurry supply branch pipeline is provided with a slurry amount regulating valve and is communicated with the upper pipe ends of the two slurry spraying pipes which are positioned at the same side along the flue gas flowing direction.
Preferably, the inlet adjusting baffle is a flue gas flow adjusting baffle, the inlet end of the inlet adjusting baffle is connected with the flue gas inlet channel, and the outlet end of the inlet adjusting baffle is connected with the inlet end of each reaction module channel of the desulfurization reaction module unit;
the outlet adjusting baffle is a flue gas flow adjusting baffle, the inlet end of the outlet adjusting baffle is connected with the outlet end of each reaction module channel of the desulfurization reaction module unit, and the outlet end of the outlet adjusting baffle is connected with the flue gas outlet channel.
Compared with the prior art, the beneficial effects of the utility model are embodied in following several aspects:
1. be different from traditional desulfurizing tower reactor, the utility model discloses a fine tuning can be realized to a plurality of desulfurization reaction module combinations, compares the traditional technology that adopts the desulfurizing tower to the demand degree of lime stone material and reduces more than 20%.
2. Due to the adoption of modularization and single module maintenance, the overall operation condition of the desulfurization equipment is not greatly influenced, and the operation reliability of the system is higher.
3. The export is provided with export adjusting damper, can realize adjusting defroster local load, reaches high-efficient defogging.
4. The reaction of the flue gas in each group of reaction module channels is relatively independent, so that the adjustability of the system is greatly improved, the system can adapt to high-sulfur flue gas and low-sulfur flue gas, can be adjusted in a short time, and has stronger load change; the reaction capability is strong, and the requirement of removing sulfur in the flue gas with high sulfur content can be met;
5. investment cost is low, because need not to circulate the thick liquid, has avoided a large amount of pump and pipeline investments, compares in traditional desulfurizing tower reactor, needn't build desulfurizing tower and a large amount of limestone slurry treatment facility, and required equipment significantly reduces.
6. The low-concentration limestone slurry is adopted for spraying, the blocking condition of a pipeline and a spray head is greatly reduced, and the maintenance amount is reduced.
7. Different from the reaction of the traditional desulfurizing tower, the energy consumption is low, and the process can realize the real-time monitoring of the reaction, does not need a large amount of spraying and has low power consumption.
To sum up, the utility model provides a modularization lime stone wet flue gas desulfurization reaction unit for the disposable construction of desulfurization system can satisfy the whole running life of unit basically, reduces and reforms transform the investment, and under the circumstances that coal-fired power generation cost rises gradually at present, can satisfy the purification requirement of high sulfur flue gas. Under the large environment that more units participate in peak shaving, the load fluctuation is large, the modularized desulfurization reaction unit can change better along with the load, and the requirement of flue gas sulfur removal under each load is met.
Drawings
FIG. 1 is a sectional view of a modular limestone wet desulfurization reaction apparatus according to the present invention;
fig. 2 is a schematic structural diagram of the modular limestone wet desulphurization reaction device provided by the utility model.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Examples
As shown in fig. 1, the modular limestone wet desulphurization reaction device provided by the invention sequentially comprises a flue gas inlet channel 2 communicated with an inlet of the device, a desulphurization reaction module unit connected between the inlet and the outlet in the device, and a flue gas outlet channel 6 communicated with an outlet of the device along a flue gas flowing direction;
the desulfurization reaction module unit is formed by vertically arranging a plurality of groups of mutually independent reaction module channels layer by layer; each group of reaction modules has the same channel structure form, a plurality of reaction modules 3 which are detachably connected in pairs are connected in series to form a channel structure which is communicated along the flowing direction of flue gas, and the two reaction modules 3 at the two ends are respectively communicated with an inlet and an outlet of the device;
any one reaction module 3 is provided with slurry spray pipes which are vertically arranged at four corners of the inner cavity, the bottom of the reaction module is communicated with a reaction slurry collecting pipe 4, the upper pipe ends of the four slurry spray pipes are communicated with a slurry supply pipeline 9, slurry nozzles which have horizontal spraying directions and face the center of the inner cavity of the reaction module are arranged at equal heights, and each slurry spray pipe is provided with a plurality of slurry nozzles which are vertically arranged at intervals;
an inlet adjusting baffle plate 1 is arranged at the inlet of the device, and the flue gas inlet channel 2 can be communicated with at least one group of reaction module channels through the inlet adjusting baffle plate 1;
an outlet adjusting baffle 5 is arranged at the outlet of the device, a demister 7 is arranged on the position, close to the outlet adjusting baffle 5, of the flue gas outlet channel 6, and the demister 7 can demist the flue gas flowing out of the desulfurization reaction module unit through the outlet adjusting baffle 5 by using local plates or all plates.
Furthermore, the reaction modules 3 are in a rectangular shell structure, two side wall surfaces perpendicular to the flow direction of the flue gas are open, the bottom of each reaction module 3 is gradually contracted to form a conical hopper serving as a slurry collecting hopper, and the bottom of each reaction module 3 corresponding to the slurry collecting hopper is converged to the reaction slurry collecting pipe 4 through a slurry outlet pipe.
Furthermore, two slurry supply branch pipelines 10 which are arranged in parallel along the flowing direction of the flue gas are respectively formed above the slurry supply pipeline 9 corresponding to each group of reaction module channels, and each slurry supply branch pipeline 10 is provided with a slurry amount regulating valve 8 and is communicated with the upper pipe ends of the two slurry spraying pipes which are positioned at the same side along the flowing direction of the flue gas.
Further, the inlet adjusting baffle 1 is a flue gas flow adjusting baffle, the inlet end is connected with the flue gas inlet channel 2, and the outlet end is connected with the inlet end of each reaction module channel of the desulfurization reaction module unit;
the outlet adjusting baffle 5 is a flue gas flow adjusting baffle, the inlet end of the outlet adjusting baffle is connected with the outlet end of each reaction module channel of the desulfurization reaction module unit, and the outlet end of the outlet adjusting baffle is connected with the flue gas outlet channel 6.
The invention also provides a desulfurization process based on the modular limestone wet desulfurization reaction unit, which comprises the following steps:
s1, preparing limestone slurry with the mass percentage concentration of 50-70%;
s2, conveying the limestone slurry to a slurry spraying pipe through a slurry supply pipeline 9, and spraying the limestone slurry to each reaction module in the desulfurization reaction module unit through a slurry nozzle on the slurry spraying pipe;
in the step, the prepared limestone slurry is directly conveyed to the reaction module, and the used slurry does not need to be recycled.
S3, containing SO2The flue gas enters each reaction module channel of the desulfurization reaction module unit through the flue gas inlet channel 2 and is mixed with limestoneCarrying out reverse contact reaction on the slurry; according to the flue gas treatment requirement, the flow rate of flue gas and the number of input reaction module channels are adjusted through an inlet adjusting baffle 1;
in the step, because the concentration of the limestone slurry is low, the reaction is complete, and the content of limestone in the slurry after the desulfurization reaction is low, the limestone can be converged to the reaction slurry collecting pipe 4.
In the step, the channels of the reaction modules are arranged in parallel, the flow direction of the flue gas is single, the flow is improved, and the resistance is convenient to reduce.
In the step, the flow is distributed through the inlet adjusting baffle 1 and enters the reaction module 3, when the sulfur content is low, most of flue gas can be concentrated in a local reaction module channel, the investment of the reaction module 3 is reduced, and the material consumption is reduced.
S4, monitoring the sulfur content and the water content in the flue gas treated by each reaction module 3 in real time, and adjusting the number of nozzles in each group of reaction module channels to reduce energy consumption after the sulfur content reaches the standard;
s5, adjusting the flow rate of the smoke with qualified sulfur content through the outlet adjusting baffle 5, then passing through the demister 7, entering the chimney through the smoke outlet channel 6 and discharging into the atmosphere; the reacted limestone slurry flows downwards to the reaction slurry collecting pipe 4 under the action of gravity.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (4)
1. A modularized limestone wet desulphurization reaction device is characterized by sequentially comprising a flue gas inlet channel communicated with an inlet of the device, a desulphurization reaction module unit connected between the inlet and the outlet in the device and a flue gas outlet channel communicated with the outlet of the device along the flow direction of flue gas;
the desulfurization reaction module unit is formed by vertically arranging a plurality of groups of mutually independent reaction module channels layer by layer; each group of reaction modules has the same channel structure form, a plurality of reaction modules which are detachably connected in pairs are connected in series to form a channel structure which is communicated along the flowing direction of flue gas, and two reaction modules at two ends are respectively communicated with an inlet and an outlet of the device;
any reaction module is provided with slurry spray pipes which are vertically arranged at four corners of the inner cavity, the bottom of the reaction module is communicated with a reaction slurry collecting pipe, the upper pipe ends of the four slurry spray pipes are communicated with a slurry supply pipeline, slurry nozzles which have horizontal spraying directions and face the center of the inner cavity of the reaction module are arranged at equal heights, and each slurry spray pipe is provided with a plurality of slurry nozzles which are vertically arranged at intervals;
an inlet adjusting baffle is arranged at the inlet of the device, and the flue gas inlet channel can be communicated with at least one group of reaction module channels through the inlet adjusting baffle;
an outlet adjusting baffle is arranged at the outlet of the device, a demister is arranged at the position, close to the outlet adjusting baffle, of the flue gas outlet channel, and the demister can demist the flue gas flowing out of the desulfurization reaction module unit by using local plates or all plates through the outlet adjusting baffle.
2. The modular limestone wet desulphurization reaction unit as claimed in claim 1, wherein the reaction modules are of a rectangular parallelepiped housing structure, two side wall surfaces perpendicular to the flue gas flowing direction are open, the bottom parts are gradually contracted to form conical buckets as slurry collecting buckets, and each reaction module is converged to the reaction slurry collecting pipe through a slurry outlet pipe at the bottom part of the corresponding slurry collecting bucket.
3. The modular limestone wet desulphurization reaction unit as claimed in claim 1, wherein two slurry supply branch pipes arranged in parallel along the flue gas flowing direction are respectively formed above each group of reaction module channels by the slurry supply pipe, each slurry supply branch pipe is provided with a slurry quantity regulating valve and is communicated with the upper pipe ends of two slurry spray pipes on the same side along the flue gas flowing direction.
4. The modular limestone wet desulphurization reaction unit as claimed in claim 1, wherein the inlet regulating baffle is a flue gas flow regulating baffle, the inlet end is connected with the flue gas inlet channel, and the outlet end is connected with the inlet end of each reaction module channel of the desulphurization reaction module unit;
the outlet adjusting baffle is a flue gas flow adjusting baffle, the inlet end of the outlet adjusting baffle is connected with the outlet end of each reaction module channel of the desulfurization reaction module unit, and the outlet end of the outlet adjusting baffle is connected with the flue gas outlet channel.
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| CN112495177A (en) * | 2020-11-10 | 2021-03-16 | 华能巢湖发电有限责任公司 | Modularized limestone wet desulphurization reaction device and desulphurization process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112495177A (en) * | 2020-11-10 | 2021-03-16 | 华能巢湖发电有限责任公司 | Modularized limestone wet desulphurization reaction device and desulphurization process |
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