CN1228127C - Stratum granulosum filter of double-pass moving bed - Google Patents

Abstract

The present invention relates to a granular layer filter of a moving bed for removing coal gas and smoke gas under high temperature and pressure. The granular layer filter is provided with a vertical cylindrical casing, a cylindrical gas collecting cylinder body and a filter conic bucket, wherein the vertical cylindrical casing is covered by an upper seal head, a cylinder body and a lower seal head and is provided with a filtering gas inlet pipe, a filtering material inlet pipe, a filtering gas outlet pipe and a filtering material outlet pipe; the cylindrical gas collecting cylinder body communicated with the filtering material inlet pipe is arranged on the upper part of the inner cavity of the casing; a division cylinder body is arranged in the gas collecting cylinder body and the upper edge and the lower edge of the division cylinder body are respectively below the upper edge and the lower edge of the gas collecting cylinder body; the filtering gas inlet pipe extends into the division cylinder body via the gas collecting cylinder body after passing through the upper seal head of the casing; the filter conic bucket communicated with the filtering material outlet pipe at the bottom of the casing is arranged on the lower part of the inner cavity of the casing. In the process of working, dusty gas which enters the filter from the gas inlet pipe firstly flows downward and downstream with filtering material particles and then enters an adjacent filtering material zone to flow upward and upstream with the filtering material particles; dust from a downstream zone is collected again in an upstream zone to realize the aim of high efficiency for dust removal.

Description

The round trip moving granular bed filter

Affiliated technical field

Content of the present invention belongs to the filtering separation device technical field, relates to a kind of moving granular bed filter that is used for carrying out coal gas and flue gas ash removal under HTHP.

Background technology

Integrated gasification combined cycle plants (IGCC) and pressurized fluidized bed combined cycle (PFBC-CC) are the clean coal generation technologies that can better solve energy-conservation and environmental protection two hang-ups in the coal generating system of generally acknowledging at present, and the moving granular bed dust removal by filtration then is considered to be hopeful most and one of the high-temperature dust removal technology of the most potential IGCC of being used for and PFBC-CC.Granular-bed filter is to utilize physics and the highly stable solid particle of chemical property to form filter course to realize the device to gas filtration, has advantage high temperature resistant and that persistence is good, by the improvement in the design, granular-bed filter can also combine with flue gas desulfurization, thereby expands the performance of self.

For moving granular bed filter, can be divided into cross-current, following current and three kinds of forms of adverse current by bed and air-flow travel direction.The cross-current form is that the air current flow direction is vertical with the stratum granulosum moving direction, owing to be difficult for forming stable grit sedimentary deposit, thereby filter efficiency is lower.The following current form is that the air current flow direction is identical with the stratum granulosum moving direction, it forms the settled layer of grit easily, the variation of comparing voidage with the cross-current form is less, but because the air current flow direction is identical with the stratum granulosum moving direction, the grit back-mixing is carried and made to the grit that will capture secretly easily, reduced arresting efficiency, and this bed arranged in form is got up also relatively more difficult.The adverse current form is that the air current flow direction is opposite with the stratum granulosum moving direction, general dust-contained airflow flows from bottom to top, stratum granulosum moves from top to bottom, moving the influence of the stratum granulosum voidage on the uprush direction of stratum granulosum is less, the dust of stratum granulosum deposition reduces on the filtering gas airflow direction gradually in addition, before gas leaves stratum granulosum, the always clean stratum granulosum that runs into, therefore prevented from preferably to deposit the back-mixing of dust and carry secretly, its form is more superior than cross-current form and following current form, but the prerequisite of gas/particle adverse current operation be the gas superficial rate of filtration less than closing on boundary's fluidizing velocity, this equipment that has limited reverse-flow moving granular bed filter is to a certain extent exerted oneself.

Summary of the invention

The objective of the invention is to make improvement at the problem that prior art exists, provide a kind of rational in infrastructure, stable, can effectively prevent the back-mixing of deposited particles and the round trip moving granular bed filter of carrying secretly and efficiency of dust collection further being improved.

The technical solution that adopts is so for achieving the above object: the round trip moving granular bed filter that is provided has one by upper cover, cylindrical shell and low head surround the upright cylinder shell of formation, the housing upper end is provided with filtering gas inlet tube and filtrate inlet tube, housing sidewall and lower end are respectively equipped with filtering gas outlet and filtrate outlet, a cylindrical shape gas collection cylindrical shell that is communicated with the filtrate inlet tube is housed on housing inner chamber top, in the gas collection cylindrical shell, be provided with a subregion cylindrical shell, on the subregion cylindrical shell, lower edge be lower than respectively the gas collection cylindrical shell on, lower edge, after the filtering gas inlet tube is passed by the housing upper cover, in the gas collection cylindrical shell stretches into the subregion cylindrical shell; Be provided with the filter awl bucket that is communicated with housing bottom filtrate outlet in housing inner chamber bottom.In this filter course of work, the dusty gas that is entered in the housing by gas inlet tube flows downward with the filtering material particle following current earlier, after enter adjacent filtrate district and filtering material particle adverse current and upwards flow, the dust of taking out of by the following current district, obtain once more capturing in countercurrent zone, so just further improved efficiency of dust collection.

Round trip moving granular bed filter of the present invention adopts cylinder to carry out the subregion of filtrate and the water conservancy diversion of gas, can carry out coal gas and flue gas ash removal under 400～800 ℃, the HTHP of 1.0～3.0MPa.Relevant experimental study shows that this filter can be realized the integrated operation of granular bed filter and strength circulation deashing.Making on the structure, this filter combines following current and counter-flow moving bed characteristics, the filtering gas import is in the forward flow filtering district on the one hand, because can having than adverse current, forward flow filtering filters the big rate of filtration, may produce the local fluidization problem owing to the gas feed zone velocity is excessive when having avoided simple adverse current to filter, on the other hand, the filtering gas outlet is above the adverse current filtering area, what run into when gas leaves stratum granulosum is clean particle, carrying secretly dust when having avoided that gas separates with filtering material particle in the simple employing forward flow filtering process, inertial collision was to the capture effect of dust when in addition, the change of gas flow also can improve filtration in the stratum granulosum.Filter of the present invention can be regulated the flow process length of following current, adverse current by the length that changes gas collection cylindrical shell, subregion cylindrical shell, filtering gas inlet tube.

Compare with present known other filters in this area, filter of the present invention has remarkable advantages when 400～800 ℃ of scopes, metal that alternative price is higher or ceramic filter, its product can be widely used in the purification or resource recovering system in multiple fields such as clean coal power generation, metallurgy, chemical industry, coal and urban environmental protection, industrial quarters is reduced dust emission, the valuable catalyst of recovery or raw material all important meaning, and popularizing application prospect is wide.

Description of drawings

Fig. 1 is the structural representation of a specific embodiment of the present invention.

Fig. 2 implements the dynamic duty process schematic diagram of dust collecting process for adopting filter of the present invention.

The specific embodiment

Referring to Fig. 1, this round trip moving granular bed filter is made of filter housings 1, gas collection cylindrical shell 2, subregion cylindrical shell 3, filter awl bucket 4, filtering gas inlet tube 5, filtering gas outlet 6, filtrate inlet tube 7, filtrate outlet 8.Filter housings 1 comprises upper cover 1.1, cylindrical shell 1.2, low head 1.3 3 parts that surround formation from top to bottom.Gas collection cylindrical shell 2, subregion cylindrical shell 3 and filtering gas inlet tube 5 and filter cylinder 1.2 deads in line are arranged in filter top.Gas collection cylindrical shell 2 is a circle tube member, and its upper limb links to each other with upper cover 1.1.Pack in this granular-bed filter behind the filtrate 9, the annular space that filtrate 9 upper surfaces of piling up in cavity wall, gas collection cylindrical shell 2 outer walls and the filter on the filter housings 1 surround constitutes gas collection space 10.Subregion cylindrical shell 3 is in gas collection cylindrical shell 2, its upper limb and lower edge are lower than the upper limb and the lower edge of gas collection cylindrical shell 2 respectively, arranging the some blocks of steel plates (figure does not draw) that are used for connecting subregion cylindrical shell 3 and gas collection cylindrical shell 2 or filter cylinder 1.2 on the axis plane excessively, play a supportive role.Filtering gas inlet tube 5 is in filter central upper portion position, and body passes upper cover 1.1 and stretches in the subregion cylindrical shell 3, and the lower end of pipe is a horn mouth.Filtering gas outlet 6 joins with filter cylinder 1.2 tops and communicates with gas collection space 10.Filter awl bucket 4 is located at the filter bottom, and the upper and lower edge of awl bucket links to each other with the mode of filter housings 1 by spot welding.Filtrate inlet tube 7 links to each other with filter upper cover 1.1, and its entrance point communicates with gas collection cylindrical shell 2 inboards.Filtrate outlet 8 links to each other with filter awl bucket 4 with low head 1.3 in filter lower central position.

Adopt round trip moving bed granular bed filter system that organization plan of the present invention implements and dust collecting process flow process as shown in Figure 2.Round trip moving bed granular bed filter system is made of round trip moving granular bed filter and strength circulation soot cleaning system 11, and strength circulation soot cleaning system 11 comprises feeding cycle device 11.1, carrier pipe 11.2, dust remover 11.3, cyclone separator 11.4, ash-discharging device 11.5 etc.In system's real work, filtrate 9 enters gas collection cylindrical shell 2 inboards, filter top through filtrate inlet tube 7, is divided into inside and outside two strands at subregion cylindrical shell 3 upper limbs and flows downward, and converges the back to falling into filter awl bucket 4 at subregion cylindrical shell 3 lower edges again; After high temperature, high pressure by gasification furnace enters the round trip moving granular bed filter from filtering gas inlet tube 5, earlier downwards with subregion cylindrical shell 3 in filtrate to do following current mobile, change direction at subregion cylindrical shell 3 lower edges, make counter-current flow with filtrate 9, then enter the annular gas collection space 10 in gas collection cylindrical shell 2 outsides by filtrate, go out QC 6 from filtering gas and flow out; Dust in the coal gas is when coal gas and filtrate 9 are done following current and flowed, part is captured and carries by filtrate 9 and moves downward, the dust of collection at large and capture the dust of being carried secretly by air-flow the back and will when coal gas and filtrate 9 are made counter-current flow, further obtain capture in following current is flowed; Subregion cylindrical shell 3 inboards and the outside are taken dirt filtrate 9 and are gone out filter through filters awl bucket 3 downwards, by filtrate outlet 5, enter feeding cycle device 11.1; Under the carrying of high pressure nitrogen, filtrate 9 and dust enter in the dust remover 11.3 through carrier pipe 11.2, make filtrate 9 and dust separation in dust remover 11.3; Filtrate 9 enters in the filter by filtrate inlet tube 7 and recycles in the dust remover 11.3, dust enters cyclone separator 11.4 after being carried out dust remover 11.3 by deashing gas, the dust that is trapped is discharged through ash-discharging device 11.5, and the small amount of dust that does not trap then is carried to subsequent technique by deashing gas and handles.Because filerting cone hopper 3 is that spot welding is connected with filter housings 1, the inside and outside gas pressure balancing of awl bucket.

Claims (2)

1, a kind of round trip moving granular bed filter, has one by upper cover (1.1), cylindrical shell (1.2) and low head (1.3) surround the upright cylinder shell (1) of formation, housing (1) upper end is provided with filtering gas inlet tube (5) and filtrate inlet tube (7), on housing sidewall, be provided with filtering gas outlet (6), be provided with filtrate outlet (8) in the lower end of housing, it is characterized in that being equipped with a cylindrical shape gas collection cylindrical shell (2) that is communicated with filtrate inlet tube (7) on housing (1) inner chamber top, in gas collection cylindrical shell (2), be provided with a subregion cylindrical shell (3), the upper limb of subregion cylindrical shell (3) is lower than the upper limb of gas collection cylindrical shell (2), the lower edge of subregion cylindrical shell (3) is lower than the lower edge of gas collection cylindrical shell (2), after filtering gas inlet tube (5) is passed by housing upper cover (1.1), in gas collection cylindrical shell (2) stretches into subregion cylindrical shell (3); Be provided with the filter awl bucket (4) that is communicated with housing bottom filtrate outlet (8) in housing (1) inner chamber bottom.

2, round trip moving granular bed filter according to claim 1 is characterized in that being arranged in gas collection cylindrical shell (2), subregion cylindrical shell (3) and filtering gas inlet tube (5) and filter cylinder (1.2) dead in line on filter top.

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