Anti-blocking PNCR system for flue gas denitrification

Abstract

The utility model discloses an anti-blocking PNCR system for flue gas denitrification, and relates to the technical field of flue gas purification. The PNCR denitration device comprises a PNCR denitration agent bin, the top of the PNCR denitration agent bin is communicated with compressed air through a bin top dust remover, a vibrating motor is arranged on the outer wall of a bottom conical section, and a fluidized gas disc device is arranged on the inner wall of the bottom conical section of the PNCR denitration agent bin; compressed air is connected with the fluidization gas disc device. According to the utility model, the vibrating motor is arranged on the outer wall of the conical section at the bottom of the PNCR denitration agent bin, so that arching accumulation of materials is avoided; a group of fluidized gas disc devices are arranged on the inner wall of a conical section at the bottom of the PNCR denitration agent bin, so that accumulation or suspension of materials is damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas purification technical field more specifically, it is a kind of flue gas denitration with anti-blocking PNCR system. BACKGROUND

[0002] Due to the low SNCR denitration efficiency (generally 30%-50%) very difficult to meet the ultra-low emission requirements, so flue gas purification denitration often uses coupling method (SCR+SNCR) process;But the SCR catalyst in this process is expensive and needs to be replaced regularly, in addition, the optimal reaction temperature of SCR is between 280-420 DEG C, to avoid dioxin generation, part of process is generally arranged after wet desulphurization SCR system, lead to entire flue gas purification system needs to be configured GGH, SGH etc. heat exchanger equipment to heat the flue gas after desulphurization, consume additional steam etc.;Therefore, this process has the problems of large floor area, complex system, high investment cost, large system resistance, high operation cost etc.

[0003] High molecular selective denitration (PNCR) uses high molecular material as carrier, and polimerization is loaded on high molecular material to make powder-like material, which is sprayed into furnace by double-fluid spray gun through pneumatic conveying, and at 750-1050 DEG C high temperature, the chemical bond of high molecular carrier and amino group in the material is broken, and a large amount of amino group is released to react with NO x In flue gas to generate non-toxic and non-polluting N2, CO2 and H2O, realize NO x Removal;PNCR denitration technology combined with SNCR denitration has the advantages of reducing denitration system equipment configuration and reducing investment cost, and engineering application is more and more in recent years. But PNCR denitrification agent is solid powder high molecular material, and the bridging and wall sticking phenomenon often occurs in the bottom cone section of the silo, which leads to unstable supply of PNCR denitrification agent and affects the system denitration efficiency.

[0004] Therefore, for flue gas denitration, it is necessary to design a PNCR system with small floor area, low one-time investment cost and stable system discharging under the premise of meeting the denitration efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the bridging and wall sticking phenomenon of solid powder high molecular denitrification agent in the bottom cone section of the silo, which leads to unstable supply of PNCR denitrification agent and affects the system denitration efficiency, and provides a flue gas denitration anti-blocking PNCR system.

[0006] In order to achieve the above object, the technical scheme of the utility model is: a kind of PNCR system for preventing blockage of flue gas denitration, it is characterized by including PNCR denitration agent bunker;The compressed air is communicated with the top dust remover of the top of the PNCR denitration agent bunker, and the bottom cone section outer wall is provided with a vibrating motor, and the bottom cone section inner wall of the PNCR denitration agent bunker is provided with a fluidized gas disc device;

[0007] The compressed air is connected with the fluidized gas disc device.

[0008] In the above technical scheme, the bottom cone section of the PNCR denitration agent bunker is connected with the activation hopper through the elastic connecting device.

[0009] In the above technical scheme, the activation hopper is provided with an arch breaking device.

[0010] In the above technical scheme, it also includes two-way feeding system, the feeding system includes a weighing feeder, the weighing feeder includes a weighing hopper and a screw feeder;The bottom of the activation hopper is sequentially connected with the weighing hopper of each feeding system through a pneumatic butterfly valve and a pneumatic tee valve, and the weighing hopper is connected with the screw feeder.

[0011] In the above technical scheme, it also includes a conveying system, the conveying system includes a Roots blower, a Venturi ejector and a gas-material distributor;

[0012] The screw feeder is connected with the Venturi ejector, the Roots blower is connected with the gas-material distributor through the Venturi ejector, and the gas-material distributor is connected with multiple spray guns.

[0013] In the above technical scheme, the weighing hopper is connected with the top of the PNCR denitration agent bunker through a breathing pipeline.

[0014] In the above technical scheme, the compressed air is connected with the spray gun, and the screw feeder is controlled by a variable frequency motor;The screw feeder is connected with the Venturi ejector through a rotary feeding valve.

[0015] In the above technical scheme, the spray gun is an inner-outer sleeve type double-fluid spray gun, the inner gun tube is connected with the gas-material distributor, and the outer sleeve is connected with the compressed air.

[0016] In the above technical scheme, the top dust remover is connected with a dust remover fan;The top of the PNCR denitration agent bunker is provided with a vacuum release valve and a manhole.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1) The PNCR denitration system of the utility model is more economical:

[0019] The utility model discloses a conveying system is with high polymer denitration agent is spouted to the high temperature position of boiler furnace, can realize efficient denitration, and the utility model discloses simple equipment, low investment cost, small floor space, short construction period, no catalyst regeneration and replacement cost in the operation process, ammonia escape risk and the disadvantage of SCR denitration.

[0020] 2) The utility model discloses configure multiple sets of anti -blocking measures, and the material bin has no risk of blocking:

[0021] The utility model discloses configure the vibration motor at the bottom cone section outer wall of PNCR denitration agent material bin, and the vibration force of centrifugal effect produced through motor rotation is used to vibrate the PNCR denitration agent material bin bottom hopper wall surface, and the vibration force is passed to the internal high polymer material through the PNCR denitration agent material bin bottom hopper wall, and the material is avoided to be accumulated in arch shape;

[0022] The utility model discloses configure a group of fluidization gas disc device at the bottom cone section inner wall of PNCR denitration agent material bin, and the fluidization gas disc has the common effect of vibration fluidization and jet fluidization, and the accumulation or suspension of material is destroyed;

[0023] The utility model discloses configure the activation hopper below the bottom cone section of PNCR denitration agent material bin, and the activation hopper and the bottom cone section of material bin adopt the elastic connecting device soft connection seal, and the inside of activation hopper is provided with arch breaking device, is further prevented from blocking under the vibration of the activation hopper self -bearing vibration motor.

[0024] 3) The utility model discloses process optimization, and the discharge is more stable:

[0025] Traditional unloading process is " material bin → manual butterfly valve → rotary valve → pneumatic three-way valve → weighing hopper", and the traditional process is often blocked in rotary valve, and the utility model improves the unloading process to " material bin → pneumatic butterfly valve → pneumatic three-way valve → weighing hopper", and the material amount of weighing hopper is controlled through pneumatic butterfly valve, to avoid the blocking of unloading pipeline valve;

[0026] The utility model discloses that the top of weighing feeder of each way is provided with a set of breathing pipeline, is connected to the top position of PNCR denitration agent material bin, guarantees the smooth discharge of weighing hopper. ACCURACY

[0027] Figure 1 It is the system flow chart of the utility model.

[0028] Figure 2 It is the system installation drawing of the utility model.

[0029] Wherein, A-compressed air, 100-PNCR denitration agent silo, 110-silo top dust collector, 111-dust collector fan, 120-vacuum release valve, 130-manhole, 210-rapping motor, 220-fluidized gas disc device, 300-activation hopper, 310-elastic connecting device, 320-arch breaking device, 400-feeding system, 410-weighing feeder, 411-weighing hopper, 412-screw feeder, 413-rotary feeding valve, 414-breathing pipeline, 421-pneumatic butterfly valve, 422-pneumatic tee valve, 500-conveying system, 510-roots blower, 520-venturi ejector, 530-gas and material distributor, 531-lance. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below with reference to the drawings, but they do not constitute limitations on the present application, but are only examples. At the same time, through the description, the advantages of the present application will become clearer and easier to understand.

[0031] As shown in Figure 1 and Figure 2 , a PNCR system for preventing blockage of flue gas denitration, characterized in that: comprising a PNCR denitration agent silo 100; the top of the PNCR denitration agent silo 100 is communicated with compressed air A through a silo top dust collector 110, the outer wall of the bottom cone section is provided with a rapping motor 210, and the inner wall of the bottom cone section of the PNCR denitration agent silo 100 is provided with a fluidized gas disc device 220;

[0032] The compressed air A is connected with the fluidized gas disc device 220.

[0033] The bottom cone section of the PNCR denitration agent silo 100 is connected with an activation hopper 300 through an elastic connecting device 310.

[0034] The activation hopper 300 is provided with an arch breaking device 320.

[0035] Further comprising two feeding systems 400, the feeding system 400 comprises a weighing feeder 410, the weighing feeder 410 comprises a weighing hopper 411 and a screw feeder 412; the bottom of the activation hopper 300 is connected with the weighing hopper 411 of each feeding system 400 in turn through a pneumatic butterfly valve 421 and a pneumatic tee valve 422, and the weighing hopper 411 is connected with the screw feeder 412.

[0036] Further comprising a conveying system 500, the conveying system 500 comprises a roots blower 510, a venturi ejector 520 and a gas and material distributor 530;

[0037] The screw feeder 412 is connected with the venturi injector 520, the roots blower 510 is connected with the air material distributor 530 through the venturi injector 520, and the air material distributor 530 is connected with a plurality of spray guns 531.

[0038] The weighing hopper 411 is connected with the top of the PNCR denitration agent bin 100 through the breathing pipeline 414.

[0039] The compressed air A is connected with the spray gun 531, the screw feeder 412 is controlled by a variable frequency motor, and the screw feeder 412 is connected with the venturi injector 520 through the rotary feeding valve 413.

[0040] The spray gun 531 is a double-fluid spray gun with an inner and outer sleeve, the inner gun tube is connected with the air material distributor 530, and the outer sleeve is connected with the compressed air A.

[0041] The spray gun 531 is arranged in two layers, and each layer of the spray gun 531 corresponds to an air material distributor 530.

[0042] The bin top dust remover 110 is connected with the dust remover fan 111, and the top of the PNCR denitration agent bin 100 is provided with a vacuum release valve 120 and a manhole 130.

[0043] In actual use, the PNCR denitration agent feeding system can be configured to be lifted and electrically conveyed to the top of the PNCR denitration agent bin 100, and then the PNCR denitration agent is added into the PNCR denitration agent bin 100 through a manual feeding port, or an automatic feeding system is configured to realize.

[0044] The bin top dust remover 110 is a bag-type dust remover, during feeding of the PNCR denitration agent bin 100, air in the PNCR denitration agent bin 100 is discharged through a filter bag to prevent the PNCR denitration agent bin 100 from being pressurized; the bin top dust remover 110 not only operates during feeding of the bin, but also operates at regular intervals during operation; the bin top dust remover 110 contains a back flushing device and the dust remover fan 111, and the capacity needs to be considered to reduce the overflow when the bag is discharged.

[0045] The vibrating motor 210 is provided with eccentric parts at both ends of the rotating shaft, and can generate a vibration force due to centrifugal force when the vibrating motor 210 rotates; the vibration force is transmitted to the internal high polymer material through the bin wall of the PNCR denitration agent bin 100 to avoid arching of the material; the vibrating motor 210 has a low price and simple system maintenance, and in most cases, the vibrating motor 210 has a good effect on vibrating and breaking arching of granular and flowable materials, but the vibrating motor 210 has a poor effect on vibrating and breaking arching of materials in a wet and sticky state.

[0046] To further prevent the PNCR denitration agent bin 100 bottom cone section material arch accumulation, help material smooth flow, PNCR denitration agent bin 100 bottom cone section wall is provided with a group of fluidized gas disc device 220, fluidized gas disc collection vibration fluidization and jet fluidization common effect, fluidized gas disc is closely installed on the inner wall of PNCR denitration agent bin 100, when air is introduced into the bin, air will flow along the wall, reduce the friction between the material and the wall, at the same time, fluidized gas disc will produce violent high-frequency vibration due to the introduction of air, destroy the material accumulation or hanging; The operation of the fluidized gas disc is not affected by the moisture content of the material, and has good fluidization effect for moisture-absorbing materials.

[0047] To avoid long-term vibration PNCR denitration agent bin 100 bin wall causes PNCR denitration agent bin 100 bottom cone section crack, leakage and shell damage, the utility model further configures an activation hopper 300 below the PNCR denitration agent bin 100 bottom cone section, the activation hopper 300 and the PNCR denitration agent bin 100 bottom cone section are connected by the elastic connection device 310, and the activation hopper 300 is internally provided with an arch breaking device 320 and can effectively prevent material blocking under the action of the self-vibration motor vibration force.

[0048] The bottom discharge of the activation hopper 300 is divided into two paths through pneumatic butterfly valve 421 and pneumatic tee valve 422, becoming two feeding systems 400, each feeding system 400 is provided with a weighing feeder 410, the weighing feeder 410 includes a weighing hopper 411 and a screw feeder 412, wherein the weighing hopper 411 is used for measuring the PNCR denitration agent injection amount; the screw feeder 412 adopts a variable frequency motor control, and the outlet flow of the material can be adjusted; the weighing feeder 412 is provided with a rotary feeder valve 413 at the outlet, and the material is sent to the venturi injector 520. To ensure smooth discharge of the weighing hopper 411, each weighing hopper 411 is provided with a set of breathing pipeline 414 connected to the top of the PNCR denitration agent bin 100.

[0049] The high molecular denitration agent enters the venturi injector 520, and the high-pressure air generated by the Roots blower 510 increases the flow rate after the venturi injector 520, and the high molecular denitration agent is swept and transported to the air-material distributor 530, and the air-material distributor 530 distributes the denitration agent to each spray gun 531; the spray gun 531 adopts an inner-outer sleeve type double-fluid spray gun, the PNCR denitration agent is sprayed into the inner gun tube, and the cooling air enters the outer sleeve tube, to prevent the spray gun 531 from being blocked, the spray gun 531 is provided with a timing purge at the same time, and the cooling air and the timing purge air of the spray gun 531 are provided by the plant compressed air tank.

[0050] The installation position of the spray gun 531 in the furnace is determined according to the temperature interval in the furnace, and two layers are arranged up and down, and the number of spray guns 531 in use can be adjusted according to the actual operation.

[0051] The use method of the utility model comprises the following steps:

[0052] The weighing instrument in the feeding system 400 detects the current weight of the PNCR in the weighing hopper 411, and sends a feeding signal when the current weight is lower than the set lower limit value, and the pneumatic butterfly valve 421 and the pneumatic three-way valve 422 start to operate; the weighing instrument monitors the current weight of the PNCR in the weighing hopper 411 in real time, and the pneumatic butterfly valve 421 and the pneumatic three-way valve 422 stop operating when the current weight is higher than the set upper limit value, and the feeding action is completed; in the feeding process, the above process is repeated when the current weight of the PNCR in the weighing hopper 411 is lower than the set lower limit value again.

[0053] When the weighing instrument detects that the current weight of the PNCR in the weighing hopper 411 is higher than the set upper limit value, the screw feeder 412 starts to feed, and the weighing instrument monitors the reduction of the current weight of the PNCR in the weighing hopper 411 in real time in the feeding process; the weighing instrument slows down the rotating speed of the screw feeder 411 through the frequency converter when the weight reduction rate is higher than the set value, and reduces the instantaneous feeding amount; the weighing instrument speeds up the rotating speed of the screw feeder 411 through the frequency converter when the weight reduction rate is lower than the set value, and increases the instantaneous feeding amount; the above process is repeated in the feeding process, so that the purpose of quantitative feeding of the PNCR is achieved.

[0054] Other parts not described belong to the prior art.

Claims

1. A PNCR system for preventing blockage of flue gas denitrification, characterized by: The invention comprises a PNCR denitrification agent silo (100); the top of the PNCR denitrification agent silo (100) is connected to compressed air (A) through a silo top dust collector (110); a vibration motor (210) is provided on the outer wall of the bottom cone section; and a fluidizing gas disc device (220) is provided on the inner wall of the bottom cone section of the PNCR denitrification agent silo (100); The compressed air (A) is connected to the fluidizing air disc device (220).

2. The anti-blocking PNCR system for flue gas denitrification according to claim 1, characterized in that: The bottom cone section of the PNCR denitrification agent silo (100) is connected to the activation hopper (300) via an elastic connection device (310).

3. The anti-blocking PNCR system for flue gas denitrification according to claim 2, characterized in that: An arch breaking device (320) is provided in the activation hopper (300).

4. The anti-blocking PNCR system for flue gas denitrification according to claim 2, characterized in that: The invention also includes two feeding systems (400), wherein the feeding system (400) includes a weighing feeder (410), and the weighing feeder (410) includes a weighing hopper (411) and a screw feeder (412); the bottom of the activation hopper (300) is connected to the weighing hopper (411) of each feeding system (400) through a pneumatic butterfly valve (421) and a pneumatic three-way valve (422) in sequence, and the weighing hopper (411) is connected to the screw feeder (412).

5. The anti-blocking PNCR system for flue gas denitrification according to claim 4, characterized in that: The invention also includes a conveying system (500), wherein the conveying system (500) includes a Roots blower (510), a Venturi ejector (520) and a gas distributor (530); The screw feeder (412) is connected to a venturi ejector (520), the roots blower (510) is connected to an air material distributor (530) via the venturi ejector (520), and the air material distributor (530) is connected to a plurality of spray guns (531).

6. The anti-blocking PNCR system for flue gas denitrification according to claim 4, characterized in that: The weighing hopper (411) is connected to the top of the PNCR denitrification agent silo (100) via a breathing pipe (414).

7. The anti-blocking PNCR system for flue gas denitrification according to claim 5, characterized in that: The compressed air (A) is connected to the spray gun (531), and the screw feeder (412) is controlled by a variable frequency motor; the screw feeder (412) is connected to the Venturi ejector (520) through a rotary feed valve (413).

8. The anti-blocking PNCR system for flue gas denitrification according to claim 7, characterized in that: The spray gun (531) is an inner and outer tube type dual-fluid spray gun, wherein the inner gun tube is connected to the gas distributor (530) and the outer tube is connected to the compressed air (A).

9. The anti-blocking PNCR system for flue gas denitrification according to claim 1, characterized in that: The silo top dust collector (110) is connected to the dust collector fan (111); and a vacuum release valve (120) and a manhole (130) are provided on the top of the PNCR denitrification agent silo (100).

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