CN108815964B - Boiler flue gas dust removal purification separation device, dust removal purification system, desulfurization and denitrification system and method - Google Patents
Boiler flue gas dust removal purification separation device, dust removal purification system, desulfurization and denitrification system and method Download PDFInfo
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- CN108815964B CN108815964B CN201810668991.9A CN201810668991A CN108815964B CN 108815964 B CN108815964 B CN 108815964B CN 201810668991 A CN201810668991 A CN 201810668991A CN 108815964 B CN108815964 B CN 108815964B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a boiler flue gas dust removal purification separation device, a dust removal purification system, a desulfurization and denitrification system and a method, which are suitable for separating and purifying dust in boiler flue gas. The method realizes the switching of the pipelines by opening and closing the program-regulated automatic control valve so as to complete the functions of separation, dust removal and back-flushing purification of the separation device. The separation device comprises an air channel, a metal corrugated plate and a metal screen. The method of the invention separates dust and dedusting gas, and uses the self-purified clean gas regeneration device, no extra energy and material are needed, the energy is saved, the efficiency is high, the technical problem that micro particles and gas are difficult to separate is effectively solved, and the process is automatically controlled, safe and reliable.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a boiler flue gas dust removal and purification separation device, a dust removal and purification system, a desulfurization and denitrification system and a method.
Background
The boiler flue gas contains a large amount of dust, sulfide and nitride, and the discharged and purified flue gas which does not reach the standard can cause atmospheric pollution and is one of the main reasons for haze in recent years. The existing boiler flue gas purification process mainly comprises dust removal, desulfurization and denitrification, and the common dust removal technologies comprise cyclone dust removal and cloth bag dust removal.
The cyclone separator is a dust remover which is widely applied, has the advantages of simple structure, low manufacturing cost, convenient use and maintenance, and capability of treating gas with high temperature, large particle size and high particle concentration, but has the defects of poor treatment effect on particles with small particle size, higher temperature of the purified gas and the like. The bag-type dust collector is a more dust collection mode applied in the existing flue gas dust collection, has the advantages of simple structure, convenient operation, low use cost and the like, but along with the prolonging of the service life, the dust easily blocks the bag, the system pressure is increased, the dust collection wind speed is improved, the energy loss is increased, the dust collection efficiency is reduced, and the maintenance is difficult.
Disclosure of Invention
In order to solve the problems existing in the prior art. The invention aims to provide a boiler flue gas dust removal purification separation device, a dust removal purification system, a desulfurization and denitrification system and a method.
The technical scheme adopted by the invention is as follows:
a dust removal, purification and separation device for boiler flue gas comprises a first air passage, a second air passage, two side plates and a plurality of metal corrugated plates;
the front side and the back side of the two side plates are arranged oppositely, from the left side to the right side of the two side plates, a plurality of corrugated metal plates are arranged between the two side plates in parallel at intervals, the front side wall and the back side wall of each corrugated metal plate are fixedly connected with the two side plates respectively, and a wavy channel is formed between every two adjacent corrugated metal plates from the lower part to the upper part of the two side plates;
a metal screen is arranged between two adjacent metal corrugated plates;
the first air passage and the second air passage are respectively connected with the upper part and the lower part of the two side plates, the upper ends of the wavy passages formed between the first air passage and the metal corrugated plates are communicated, and the lower ends of the wavy passages formed between the second air passage and the metal corrugated plates are communicated.
The metal screen comprises a plurality of sections of single-layer metal screen, the whole zigzag-shaped metal screen is arranged between two adjacent corrugated metal plates, and two ends of each section of the metal screen are respectively welded with the two adjacent corrugated metal plates.
The height of the metal screen is 1/3 along the upper part to the lower part of the wavy channel formed between two adjacent corrugated metal plates.
The distance between two adjacent corrugated metal plates is not more than 3mm, and the metal screen is a 200-mesh screen.
A dust removal, purification and separation system for boiler flue gas comprises a primary cyclone separator, a secondary cyclone separator, a plurality of automatic control valves, a plurality of pressure transmitters and two separation devices; the two separation devices are respectively a first separation device and a second separation device; the first separation device and the second separation device can be connected with a boiler desulfurization and denitrification system;
the outlet of the primary cyclone separator is connected with the second air passage of the first separating device and the second air passage of the second separating device;
the outlet of the secondary cyclone separator is connected with the second air passage of the first separating device and the second air passage of the second separating device;
the second air passage of the first separating device and the second air passage of the second separating device are both connected with the inlet of the secondary cyclone separator;
the first air passage of the first separation device and the first air passage of the second separation device can be connected with inlets of a desulfurization and denitrification system;
the first air passage of the first separation device and the first air passage of the second separation device can be connected with an outlet of the desulfurization and denitrification system;
the second air passage of the first separation device and the second air passage of the second separation device are respectively provided with a first pressure transmitter and a second pressure transmitter;
a first automatic control valve and a second automatic control valve are respectively arranged on a pipeline between a first air passage of the first separation device and an outlet of the desulfurization and denitrification system and a pipeline between the first air passage of the first separation device and an inlet of the desulfurization and denitrification system;
the second air passage of the first separation device is provided with a third automatic control valve and a fourth automatic control valve which are connected in parallel, and the third automatic control valve is arranged on a pipeline between the second air passage of the first separation device and the inlet of the secondary cyclone separator; the fourth automatic control valve is respectively connected with the outlet of the secondary cyclone separator and the outlet of the primary cyclone separator through pipelines;
a fifth automatic control valve and a sixth automatic control valve 10-6 are respectively arranged on a pipeline between the first air passage of the second separation device and the inlet of the desulfurization and denitrification system and a pipeline between the first air passage of the second separation device and the outlet of the desulfurization and denitrification system;
the second air passage of the second separation device is provided with a seventh automatic control valve and an eighth automatic control valve which are connected in parallel, and the seventh automatic control valve is arranged on a pipeline between the second air passage of the second separation device and the inlet of the secondary cyclone separator; the eighth self-control valve is respectively connected with the outlet of the secondary cyclone separator and the outlet of the primary cyclone separator through pipelines;
the first automatic control valve, the third automatic control valve, the fifth automatic control valve and the eighth automatic control valve are all connected with the first pressure transmitter;
and the second automatic control valve, the fourth automatic control valve, the sixth automatic control valve and the seventh automatic control valve are all connected with the second pressure transmitter.
The utility model provides a boiler SOx/NOx control system, boiler SOx/NOx control system is provided with piece-rate system.
A boiler flue gas dust removal purification method is based on the boiler flue gas dust removal purification separation system and comprises the following steps:
and 4, repeating the steps 2 to 3 to realize continuous separation of dust in the boiler flue gas.
The invention has the following beneficial effects:
the boiler flue gas dust removal, purification and separation device provided by the invention separates small-particle dust in flue gas through the screen meshes arranged in the metal corrugated plate and the corrugated plate, the separated dust can be blocked and filtered by the metal screen meshes, and the dust removal gas passes through the wavy channel and then is discharged out of the whole device and enters the next process.
The boiler flue gas dust removal and purification system can perform back flushing purification on the second separation device when the first separation device performs dust removal separation through the opening and closing of the automatic control valves, the pressure transmitter and the two separation devices; when the second separation device is used for dust removal separation, the first separation device is subjected to back flushing purification; the process is completely and automatically controlled, and production does not need to be stopped in the production process, so that the dust in the boiler flue gas can be continuously separated, the production efficiency is greatly improved, the time and the economic cost are saved, the purposes of energy conservation and emission reduction can be achieved, and the economic effect and the environmental benefit are obvious.
Because the boiler flue gas dedusting and purifying system is arranged in the boiler desulfurization and denitrification system, the boiler flue gas can be continuously dedusted and purified in the desulfurization and denitrification process, the efficiency is improved, and the cost is saved.
According to the boiler flue gas dedusting, purifying and separating system, the boiler flue gas dedusting and purifying method can realize continuous separation of dust in the boiler flue gas, improves the production efficiency, can create higher economic benefit and has good environmental benefit.
Drawings
FIG. 1 is a schematic diagram of a boiler flue gas dedusting and cleaning system of the present invention;
FIG. 2 is a schematic view of a boiler flue gas dust removal purification apparatus according to the present invention;
FIG. 3 is a schematic view of the frame of the boiler flue gas dust removal and purification device of the present invention;
FIG. 4 is a schematic view of the separation device of the present invention for dedusting and cleaning boiler flue gas;
FIG. 5 is a schematic view of the back-flushing purification of the separator of the present invention;
FIG. 6 is a schematic view of another separation apparatus of the present invention;
FIG. 7 is a schematic view of a plate and frame construction in another separation apparatus of the present invention;
FIG. 8 is a schematic view of a metal screen pack in another separator apparatus of the present invention;
FIG. 9 is a schematic view of the structure of another separating apparatus according to the present invention after all the metal screens are combined;
fig. 10 is a schematic view of the construction of a composite screen deck in another separation device according to the invention;
FIG. 11 is a schematic illustration of another separation apparatus of the present invention operating as a separate dust chamber;
FIG. 12 is a schematic view showing the operation of another separator of the present invention as a blowback purge chamber.
In the figure, 1-a first air passage, 1-1-a second air passage, 2-a metal corrugated plate, 4-a metal screen, 5-a side plate and 6-an outlet of a desulfurization and denitrification system; 7-an inlet of a desulfurization and denitrification system, 8-a primary cyclone separator, 9-a secondary cyclone separator, 10-1-a first automatic control valve, 10-2-a second automatic control valve, 10-3-a third automatic control valve, 10-4-a fourth automatic control valve, 10-5-a fifth automatic control valve, 10-6-a sixth automatic control valve, 10-7-a seventh automatic control valve, 10-8-an eighth automatic control valve, 11-1-a first pressure transmitter, 11-2-a second pressure transmitter, 12-a first separation device, 13-a second separation device and 14-a dryer; 101-a first air inlet and outlet channel, 101-1-a second air inlet and outlet channel, 102-a metal plate frame, 103-metal screens with different meshes, and 104-a combined screen plate.
Detailed Description
The following detailed description of the present invention, taken in conjunction with the accompanying drawings and examples, is provided to enable the invention and its various aspects and advantages to be better understood.
Referring to fig. 2 to 5, the dust removal, purification and separation device for boiler flue gas of the present invention comprises a first air passage 1, a second air passage 1-1, two side plates 5 and a plurality of corrugated metal plates 2;
the two side plates 5 are arranged in a front-back opposite mode, from the left side to the right side of the two side plates 5, the plurality of corrugated metal plates 2 are parallel to each other and are arranged between the two side plates 5 at intervals, the front side wall and the rear side wall of each corrugated metal plate 2 are fixedly connected with the two side plates 5 respectively, and a wavy channel is formed between every two adjacent corrugated metal plates 2 from the lower portion to the upper portion of each side plate 5;
a metal screen 4 is arranged between two adjacent metal corrugated plates 2;
the first air passage 1 and the second air passage 1-1 are respectively connected with the upper part and the lower part of the two side plates 5, the upper end of a wave-shaped channel formed between the first air passage 1 and the metal corrugated plate 2 is communicated, and the lower end of the wave-shaped channel formed between the second air passage 1-1 and the metal corrugated plate 2 is communicated.
Referring to fig. 4 and 5, the metal screen 4 includes a plurality of single-layer metal screens, the metal screen 4 is integrally disposed between two adjacent corrugated metal plates 2 in a zigzag manner, and two ends of each section of the metal screen 4 are respectively welded to the two adjacent corrugated metal plates 2.
Preferably, the height of the metal screen 4 is 1/3 of the height of the wave-shaped passage along the upper part to the lower part of the wave-shaped passage formed between two adjacent metal corrugated plates 2. The distance between two adjacent corrugated metal plates 2 is not more than 3mm, and the metal screen 4 is a 200-mesh screen.
As shown in fig. 1 and fig. 2, the boiler flue gas dust removal, purification and separation system of the present invention comprises a primary cyclone separator 8, a secondary cyclone separator 9, a plurality of self-control valves, a plurality of pressure transmitters and two separation devices; the two separation devices are a first separation device 12 and a second separation device 13 respectively; the first separation device 12 and the second separation device 13 can be connected with a boiler desulfurization and denitrification system;
the outlet of the primary cyclone separator 8 is connected with the second air passage 1-1 of the first separating device 12 and the second air passage 1-1 of the second separating device 13;
the outlet of the secondary cyclone separator 9 is connected with the second air passage 1-1 of the first separating device 12 and the second air passage 1-1 of the second separating device 13;
the second air flue 1-1 of the first separation device 12 and the second air flue 1-1 of the second separation device 13 are both connected with the inlet of the secondary cyclone separator 9;
the first air flue 1 of the first separation device 12 and the first air flue 1 of the second separation device 13 are both connected with an inlet 7 of a desulfurization and denitrification system;
the first air flue 1 of the first separation device 12 and the first air flue 1 of the second separation device 13 are both connected with an outlet 6 of the desulfurization and denitrification system;
a first pressure transmitter 11-1 and a second pressure transmitter 11-2 are respectively arranged on a second air passage 1-1 of the first separation device 12 and a second air passage 1-1 of the second separation device 13;
a first automatic control valve 10-1 and a second automatic control valve 10-2 are respectively arranged on a pipeline between the first air passage 1 of the first separation device 12 and the outlet 6 of the desulfurization and denitrification system and a pipeline between the first air passage 1 and the inlet 7 of the desulfurization and denitrification system;
the second air passage 1-1 of the first separation device 12 is provided with a third automatic control valve 10-3 and a fourth automatic control valve 10-4 which are mutually connected in parallel, and the third automatic control valve 10-3 is arranged on a pipeline between the second air passage 1-1 of the first separation device 12 and the inlet of the secondary cyclone separator 9; the fourth automatic control valve 10-4 is respectively connected with the outlet of the secondary cyclone separator 9 and the outlet of the primary cyclone separator 8 through pipelines;
a fifth automatic control valve 10-5 and a sixth automatic control valve 10-6 are respectively arranged on a pipeline between the first air passage 1 of the second separation device 13 and the inlet 7 of the desulfurization and denitrification system and a pipeline between the first air passage 1 and the outlet 6 of the desulfurization and denitrification system;
the second air passage 1-1 of the second separation device 13 is provided with a seventh automatic control valve 10-7 and an eighth automatic control valve 10-8 which are mutually connected in parallel, and the seventh automatic control valve 10-7 is arranged on a pipeline between the second air passage 1-1 of the second separation device 13 and the inlet of the secondary cyclone separator 9; the eighth automatic control valve 10-8 is respectively connected with the outlet of the secondary cyclone separator 9 and the outlet of the primary cyclone separator 8 through pipelines;
the first automatic control valve 10-1, the third automatic control valve 10-3, the fifth automatic control valve 10-5 and the eighth automatic control valve 10-8 are all connected with the second pressure transmitter 11-2;
the second automatic control valve 10-2, the fourth automatic control valve 10-4, the sixth automatic control valve 10-6 and the seventh automatic control valve 10-7 are all connected with the first pressure transmitter 11-1.
As shown in fig. 1, with reference to fig. 2 to 5, the method for dedusting and purifying boiler flue gas according to the present invention is performed by the above-mentioned purification system, and the process thereof is as follows:
step 2, when the second pressure transmitter 11-2 detects that the pressure of the second air passage 1-1 of the second separation device 13 exceeds a preset range value, the eighth automatic control valve 10-8 and the fifth automatic control valve 10-5 receive a detection signal of the second pressure transmitter 11-2, the eighth automatic control valve 10-8 and the fifth automatic control valve 10-5 are closed, meanwhile, the fourth automatic control valve 10-4 and the second automatic control valve 10-2 are opened, and the boiler flue gas separated by the primary cyclone separator 8 is subjected to dust removal separation through the first separation device 12; then the sixth automatic control valve 10-6 and the seventh automatic control valve 10-7 are opened, the clean gas discharged from the outlet 6 of the desulfurization and denitrification system enters the second separation device 13 from the first gas passage of the second separation device 13, the solid particles on the metal screen 4 of the second separation device 13 are subjected to back flushing, so that the solid particles are separated from the metal screen 4, then the clean gas enters the secondary cyclone separator 9 from the second gas passage 1-1 of the second separation device 13, the secondary cyclone separator 9 separates the dust-containing gas carrying the back flushing solid particles, the gas separated by the secondary cyclone separator 9 is mixed with the gas at the outlet of the primary cyclone separator 8 and then enters the first separation device 12 through the fourth automatic control valve 10-4 for dust removal and separation, when the second pressure transmitter 11-2 detects that the pressure of the second gas passage 1-1 of the second separation device 13 reaches a preset range value, the sixth automatic control valve 10-6 and the seventh automatic control valve 10-7 are closed;
step 3, when the first pressure transmitter 11-1 detects that the pressure of the second air passage 1-1 of the first separation device 12 exceeds a preset range value, the fourth automatic control valve 10-4 and the second automatic control valve 10-2 receive a detection signal of the first pressure transmitter 11-1, the fourth automatic control valve 10-4 and the second automatic control valve 10-2 are closed, meanwhile, the eighth automatic control valve 10-8 and the fifth automatic control valve 10-5 are opened, and mixed gas separated by the primary cyclone separator 8 and the secondary cyclone separator 9 is subjected to dust removal separation through the second separation device 13; then the first automatic control valve 10-1 and the third automatic control valve 10-3 are opened, clean gas discharged from the outlet 6 of the desulfurization and denitrification system enters the first separation device 12 from the first air passage 1 of the first separation device 1, solid particles on the metal screen 4 of the first separation device 12 are subjected to back flushing, so that the solid particles are separated from the metal screen 4, then the clean gas enters the secondary cyclone separator 9 from the second air passage 1-1 of the first separation device 12, the secondary cyclone separator 9 separates dust-containing gas carrying the back flushing solid particles, the clean gas separated by the secondary cyclone separator 9 is mixed with gas at the outlet of the primary cyclone separator 8 and then enters the second separation device 13 for dust removal and separation through the eighth automatic control valve 10-8, when the first pressure transmitter 11-1 detects that the pressure of the second air passage 1-1 of the first separation device 12 reaches a preset range value, the first automatic control valve 10-1 and the third automatic control valve 10-3 are closed;
and 4, repeating the steps 2 to 3 to realize continuous separation of dust in the boiler flue gas.
When the invention is used for dedusting and purifying boiler flue gas:
when opening a group of automatic control valves (the group of automatic control valves comprise a first automatic control valve 10-1, a third automatic control valve 10-3, a fifth automatic control valve 10-5 and an eighth automatic control valve 10-8), closing b group of automatic control valves (the group of automatic control valves comprise a second automatic control valve 10-2, a fourth automatic control valve 10-4, a sixth automatic control valve 10-6 and a seventh automatic control valve 10-7);
at the moment, boiler flue gas which is separated by the primary cyclone separator 8 and is mixed with a small amount of dust passes through the second separating device 13 for separation and dust removal, the second separating device 13 is used as a separation and dust removal chamber, during separation and dust removal, dust is separated from dust removal gas after the metal corrugated plate 2 and the metal screen 4, the dust removal gas passes through the separation and dust removal chamber to remove a desulfurization and denitrification section, and sulfur and nitrogen elements are removed through a desulfurization and denitrification system to obtain clean gas;
a part of desulfurized and denitrated clean gas can enter the first separation device 12 from the first air passage 1 of the first separation device 12 by controlling the first automatic control valve 10-1, at the moment, the first separation device 12 is used as a back-blowing dust purification chamber, the introduced clean gas can carry out back-blowing purification on the first separation device 12, and during back-blowing purification, the part of clean gas can blow back dust clamped in gaps of corrugated plates and gathered in the air passages, then is discharged from the second air passage 1-1 of the first separation device 12, and then goes to a secondary cyclone separator;
the pyrolysis gas with trace dust separated by the secondary cyclone separator returns to the second separation device 13; the second pressure transmitter 11-2 arranged in the second separating device 13 is interlocked with the automatic control valve connected with the second pressure transmitter 11-2, when the second pressure transmitter 11-2 detects that the pressure is overlarge, the second pressure transmitter 11-2 controls the automatic control valve connected with the second pressure transmitter to open and close, and the separating dust chamber and the back-blowing purifying chamber exchange functions, namely when the second separating device 13 is used as the separating dust chamber, the first separating device 12 is used as the back-blowing purifying dust chamber; when the first separating device 12 is used as a dust removal purification chamber, the second separating device 13 is used as a back-blowing dust purification chamber, and the continuous separation of dust removal and purification of the boiler flue gas can be realized by the repeated circulation.
And opening one of the group a of self-control valves and the group b of self-control valves, wherein when one group is opened, the other group is in a closed state. When the pressure in the device is overlarge, the opening and closing states of the automatic control valve set are changed to perform back flushing purification.
The boiler flue gas dust removal purification and separation device can also adopt the following structure:
as shown in fig. 6, the separation device comprises a first air inlet and outlet duct 101, a second air inlet and outlet duct 101-1 and a plurality of combined screening decks 102, wherein each combined screening deck 102 is provided with an inlet and an outlet;
referring to fig. 7 to 10, the combined screen deck 104 includes a metal screen 103 and a metal plate frame 102, the metal plate frame 102 is a frame structure having an inlet, an outlet and side walls, the inlets of all the metal plate frames 102 are communicated with the first air inlet and outlet duct 101, the outlets of all the metal plate frames 102 are communicated with the second air inlet and outlet duct 101-1 (see fig. 6), a plurality of metal screens 103 are arranged in the metal plate frame 102 (see fig. 10), and the metal screen 103 and the metal plate frame 102 are welded together; the mesh number of the metal screen 103 is increased progressively along the inlet-to-outlet direction of the metal plate frame 102 (see fig. 9);
as shown in fig. 8 and 9, all the metal screens are divided into a plurality of metal screen groups, and the mesh number of the metal screens in each metal screen group is the same; each metal screen group comprises three single-layer metal screens, and the three single-layer metal screens are arranged in a Z-shaped structure (see figure 8); the angle between each single-layer metal screen and the axis of the inlet and outlet direction of the metal plate frame 102 is not 90 degrees (see fig. 10 to 12).
As shown in fig. 9, the mesh number of the metal screen 103 is preferably set to be 120 mesh, 140 mesh, 170 mesh and 200 mesh in sequence along one end of the metal plate frame 102 to the other end.
The solid-gas separation device can be used for separating solid particles in the boiler flue gas. The process of separating the boiler flue gas by the boiler flue gas dedusting, purifying and separating device of the invention is as follows (refer to fig. 5-11):
introducing boiler flue gas into an inner cavity of a metal plate frame 102 from a first gas inlet and outlet channel 101, filtering solid particles by a metal screen 103 when the boiler flue gas passes through a combined sieve plate 104, removing dust gas to a desulfurization and denitrification section through the metal screen, and discharging the dust gas from an outlet of the combined sieve plate 102 through a second gas inlet and outlet channel 101-1;
when the pressure drop from the first air inlet and outlet channel 101 to the second air inlet and outlet channel 101-1 is increased, the introduction of boiler flue gas is stopped, and then purified gas is introduced from the second air inlet and outlet channel 101-1 to the inner cavity of the combined sieve plate 102, so that solid particles on the metal screen 103 are separated from the metal screen 103, and the separated solid particles are discharged from the inlet of the combined sieve plate 102 through the first air inlet and outlet channel 101.
In the invention, solid particles in the boiler flue gas are clamped on the metal screen, and the dedusting gas passes through the metal screen to a desulfurization and denitrification section, thereby realizing the separation and purification functions of the separation device. When the pressure drop of the separating device from the first air inlet and outlet channel 101 to the second air inlet and outlet channel 101-1 is increased, purified clean air is blown into the separating device in the reverse direction, and solid products clamped on the screen are blown out of the separating device, so that the separating and dedusting functions of the separating device are regenerated.
As shown in fig. 11, the flue gas containing the boiler enters from the lower part (i.e. inlet) of the metal plate frame 102, and exits from the upper part (i.e. outlet), and the process is a dust removal separation process; as shown in fig. 11, blow-back air enters from the upper portion (i.e., the outlet) of the sheet metal frame 102 and exits from the lower portion (i.e., the inlet).
Referring to fig. 6, the two separation devices of the present invention are connected with each other, and the two separation devices are a separation device a and a separation device B, respectively, and the separation device a and the separation device B are arranged in bilateral symmetry, so that dust-laden boiler flue gas from primary cyclone separation is dedusted by the separation device a, and the separation device a is used as a separation dedusting chamber to separate dust from dedusting gas, and is subjected to a desulfurization and denitrification process. When the pressure drop of the first air inlet and outlet passage 101 of the separating device A to the second air inlet and outlet passage 101-1 rises, the boiler flue gas mixed with dust and subjected to primary cyclone separation is switched to remove dust through the separating device B, a part of clean gas after desulfurization and denitrification is reversely introduced into the separating device A, the separation device A is subjected to back-blowing purification, the separation device A is a back-blowing purification chamber, in the back-blowing purification process, the back-blowing card of the clean gas is clamped in a gap of a metal sieve plate of the separating device A and the dust accumulated in the air passage, the dust is taken out of the separating device A, and the dust enters a secondary cyclone separator. The pyrolysis gas with trace dust separated by the secondary cyclone separator and the boiler flue gas separated by the primary cyclone separator are mixed and then enter a separating device B for dust removal and separation;
when the pressure drop from the first air inlet and outlet passage 101 to the second air inlet and outlet passage 101-1 of the separating device B is increased, the air passage is switched, so that the separating device A is used as a separating and dedusting chamber again to separate and remove dust from the mixed pyrolysis gas, and the separating device B is used as a back-blowing purifying chamber again to perform back-blowing purification of the separating device B, and the aim of continuous separation and dedusting is achieved by circulating the processes.
The device, the system and the method are also suitable for other industries for separating dust.
The above examples are only intended to illustrate the technical solution of the present invention and are not intended to be limiting. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that the modifications and equivalents may be made without departing from the spirit and scope of the present invention.
Claims (4)
1. A dust removal, purification and separation device for boiler flue gas is characterized by comprising a first air passage (1), a second air passage (1-1), two side plates (5) and a plurality of metal corrugated plates (2);
the front side and the back side of the two side plates (5) are arranged oppositely, a plurality of corrugated metal plates (2) are arranged between the two side plates (5) in parallel at intervals from the left side to the right side of the two side plates (5), the front side wall and the back side wall of each corrugated metal plate (2) are fixedly connected with the two side plates (5), and a wavy channel is formed between every two adjacent corrugated metal plates (2) from the lower part to the upper part of the two side plates (5);
a metal screen (4) is arranged between two adjacent corrugated metal plates (2);
the first air passage (1) and the second air passage (1-1) are respectively connected with the upper part and the lower part of the two side plates (5), the upper end of a wavy channel formed between the first air passage (1) and the corrugated metal plate (2) is communicated, and the lower end of the wavy channel formed between the second air passage (1-1) and the corrugated metal plate (2) is communicated;
the metal screen (4) comprises a plurality of sections of single-layer metal screen, the metal screen (4) is integrally arranged between two adjacent corrugated metal plates (2) in a zigzag manner, and two ends of each section of the metal screen (4) are respectively welded with the two adjacent corrugated metal plates (2);
the height of the metal screen (4) is 1/3 of the height of the wavy channel along the upper part to the lower part of the wavy channel formed between two adjacent metal corrugated plates (2);
the distance between two adjacent corrugated metal plates (2) is not more than 3mm, and the metal screen (4) is a 200-mesh screen.
2. A boiler flue gas dust removal purification separation system, characterized by comprising a primary cyclone separator (8), a secondary cyclone separator (9), a plurality of automatic control valves, a plurality of pressure transmitters and two separation devices according to claim 1; the two separation devices are respectively a first separation device (12) and a second separation device (13); the first separation device (12) and the second separation device (13) can be connected with a boiler desulfurization and denitrification system;
the outlet of the primary cyclone separator (8) is connected with the second air passage (1-1) of the first separating device (12) and the second air passage (1-1) of the second separating device (13);
the outlet of the secondary cyclone separator (9) is connected with the second air passage (1-1) of the first separating device (12) and the second air passage (1-1) of the second separating device (13);
the second air flue (1-1) of the first separation device (12) and the second air flue (1-1) of the second separation device (13) are both connected with the inlet of the secondary cyclone separator (9);
the first air flue (1) of the first separation device (12) and the first air flue (1) of the second separation device (13) can be connected with an inlet (7) of a desulfurization and denitrification system;
the first air flue (1) of the first separation device (12) and the first air flue (1) of the second separation device (13) can be connected with an outlet (6) of a desulfurization and denitrification system;
a first pressure transmitter (11-1) and a second pressure transmitter (11-2) are respectively arranged on a second air passage (1-1) of the first separation device (12) and a second air passage (1-1) of the second separation device (13);
a first automatic control valve (10-1) and a second automatic control valve (10-2) are respectively arranged on a pipeline between a first air passage (1) of the first separation device (12) and an outlet (6) of the desulfurization and denitrification system and a pipeline between the first air passage and an inlet (7) of the desulfurization and denitrification system;
the second air passage (1-1) of the first separation device (12) is provided with a third automatic control valve (10-3) and a fourth automatic control valve (10-4) which are connected in parallel, and the third automatic control valve (10-3) is arranged on a pipeline between the second air passage (1-1) of the first separation device (12) and the inlet of the secondary cyclone separator (9); the fourth automatic control valve (10-4) is respectively connected with the outlet of the secondary cyclone separator (9) and the outlet of the primary cyclone separator (8) through pipelines;
a fifth automatic control valve (10-5) and a sixth automatic control valve (10-6) are respectively arranged on a pipeline between the first air passage (1) of the second separation device (13) and the inlet (7) of the desulfurization and denitrification system and a pipeline between the first air passage and the outlet (6) of the desulfurization and denitrification system;
the second air passage (1-1) of the second separation device (13) is provided with a seventh automatic control valve (10-7) and an eighth automatic control valve (10-8) which are mutually connected in parallel, and the seventh automatic control valve (10-7) is arranged on a pipeline between the second air passage (1-1) of the second separation device (13) and the inlet of the secondary cyclone separator (9); the eighth automatic control valve (10-8) is respectively connected with the outlet of the secondary cyclone separator (9) and the outlet of the primary cyclone separator (8) through pipelines;
the first automatic control valve (10-1), the third automatic control valve (10-3), the fifth automatic control valve (10-5) and the eighth automatic control valve (10-8) are connected with the second pressure transmitter (11-2);
the second automatic control valve (10-2), the fourth automatic control valve (10-4), the sixth automatic control valve (10-6) and the seventh automatic control valve (10-7) are connected with the first pressure transmitter (11-1).
3. A boiler desulfurization and denitrification system characterized in that the boiler desulfurization and denitrification system is provided with the separation system of claim 2.
4. The boiler flue gas dedusting and purifying method based on the boiler flue gas dedusting and purifying separation system of claim 2 is characterized by comprising the following steps:
step 1, opening an eighth automatic control valve (10-8) and a fifth automatic control valve (10-5), closing the other automatic control valves, and introducing boiler flue gas into a primary cyclone separator (8) for dust removal and separation; then, the boiler flue gas separated by the primary cyclone separator (8) is introduced into a second separation device (13) from a second air passage (1-1) of the second separation device (13) for dust removal separation, during dust removal separation, solid particles in the boiler flue gas are filtered by a metal screen (4), the dust removal gas is discharged from the first air passage (1) of the second separation device (13) and enters an inlet (7) of a desulfurization and denitrification system, nitrogen and sulfur elements in the dust removal gas are removed in the desulfurization and denitrification system to obtain clean gas, and the clean gas is discharged from an outlet (6) of the desulfurization and denitrification system;
step 2, when the second pressure transmitter (11-2) detects that the pressure of a second air passage (1-1) of the second separation device (13) exceeds a preset range value, the eighth automatic control valve (10-8) and the fifth automatic control valve (10-5) receive a detection signal of the second pressure transmitter (11-2), the eighth automatic control valve (10-8) and the fifth automatic control valve (10-5) are closed, meanwhile, the fourth automatic control valve (10-4) and the second automatic control valve (10-2) are opened, and the boiler flue gas separated by the primary cyclone separator (8) is subjected to dust removal separation through the first separation device (12); then a sixth automatic control valve (10-6) and a seventh automatic control valve (10-7) are opened, clean gas discharged from an outlet (6) of the desulfurization and denitrification system enters a second separation device (13) from a first gas passage of the second separation device (13), solid particles on a metal screen (4) of the second separation device (13) are subjected to back flushing, the solid particles are separated from the metal screen (4), then the clean gas enters a secondary cyclone separator (9) from a second gas passage (1-1) of the second separation device (13), the secondary cyclone separator (9) separates dust-containing gas carrying the back flushing solid particles, the gas separated by the secondary cyclone separator (9) is mixed with gas at an outlet of a primary cyclone separator (8) and then enters a first separation device (12) through the fourth automatic control valve (10-4) for dust removal and separation, and when a second pressure transmitter (11-2) detects that the second gas passage (1) of the second separation device (13) -when the pressure of 1) reaches a preset range value, the sixth automatic control valve (10-6) and the seventh automatic control valve (10-7) are closed;
step 3, when the first pressure transmitter (11-1) detects that the pressure of the second air passage (1-1) of the first separation device (12) exceeds a preset range value, the fourth automatic control valve (10-4) and the second automatic control valve (10-2) receive a detection signal of the first pressure transmitter (11-1), the fourth automatic control valve (10-4) and the second automatic control valve (10-2) are closed, meanwhile, the eighth automatic control valve (10-8) and the fifth automatic control valve (10-5) are opened, and mixed gas separated by the primary cyclone separator (8) and the secondary cyclone separator (9) is subjected to dust removal separation through the second separation device (13); then a first automatic control valve (10-1) and a third automatic control valve (10-3) are opened, clean gas discharged from an outlet (6) of a desulfurization and denitrification system enters a first separation device (12) from a first air passage (1) of the first separation device (12), solid particles on a metal screen (4) of the first separation device (12) are subjected to back flushing, so that the solid particles are separated from the metal screen (4), then the clean gas enters a secondary cyclone separator (9) from a second air passage (1-1) of the first separation device (12), the secondary cyclone separator (9) separates dust-containing gas carrying the back flushing solid particles, the clean gas separated by the secondary cyclone separator (9) is mixed with gas at the outlet of a primary cyclone separator (8) and then enters a second separation device (13) through an eighth automatic control valve (10-8) for dust removal and separation, when the first pressure transmitter (11-1) detects that the pressure of the second air passage (1-1) of the first separation device (12) reaches a preset range value, the first automatic control valve (10-1) and the third automatic control valve (10-3) are closed;
and 4, repeating the steps 2 to 3 to realize continuous separation of dust in the boiler flue gas.
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| JP4522268B2 (en) * | 2005-01-12 | 2010-08-11 | バブコック日立株式会社 | Exhaust gas treatment facility and purge method thereof |
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| CN102631813A (en) * | 2012-04-26 | 2012-08-15 | 中国人民解放军军事医学科学院卫生装备研究所 | Renewable gas particulate filtering unit |
| CN102698532A (en) * | 2012-06-27 | 2012-10-03 | 卓卫民 | Filter bag gas-solid separator and gas-solid separation method thereof |
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