CN216395886U

CN216395886U - Be used for SCR denitration aqueous ammonia dilution system flue gas heater device

Info

Publication number: CN216395886U
Application number: CN202120306818.1U
Authority: CN
Inventors: 王乾亮; 余仙敏
Original assignee: Beijing Chinsuny Environmental Protection Tech Co ltd
Current assignee: Beijing Chinsuny Environmental Protection Tech Co ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2022-04-29
Anticipated expiration: 2031-02-03

Abstract

The utility model relates to the technical field of SCR denitration, and discloses a flue gas heater device for an SCR denitration ammonia water dilution system, which comprises an ammonia evaporator body, wherein a flue gas heater for heating air is arranged in the ammonia evaporator body, the flue gas heater comprises a plurality of heat exchange tubes which are arranged in the ammonia evaporator body at equal intervals in a horizontal mode and are in a vertical direction, a plurality of tube holders are fixedly connected to the inner wall of the ammonia evaporator body, each heat exchange tube is fixedly inserted in the corresponding tube holder, and a dilution fan which is located right below the flue gas heater and is used for discharging air to the direction of the flue gas heater is fixedly installed on the ammonia evaporator body. Compared with the traditional gas-gas heat exchanger, the gas-gas heat exchanger has the advantages of flexible installation, large installation position selectable space, no occupation of physical space, capability of replacing an electric heater and energy consumption saving.

Description

Be used for SCR denitration aqueous ammonia dilution system flue gas heater device

Technical Field

The utility model belongs to the technical field of SCR denitration, and particularly relates to a flue gas heater device for an SCR denitration ammonia water dilution system.

Background

SCR denitration is the most mature flue gas denitration technology and is widely applied to power station boiler flue gas denitration project engineering at home and abroad. Under the increasingly strict background of smoke emission, the ultralow emission of NOx is less than or equal to 50mg/Nm³The application of the SCR denitration technology in the coal-fired boiler flue gas treatment project in the heating industry also becomes a mainstream.

The SCR denitration ammonia water dilution system mainly comprises an ammonia water evaporator, an ammonia water spraying atomization spray gun, a dilution fan, an ammonia water metering system, a hot air system and the like. Firstly, 20% ammonia water is delivered to an ammonia water metering and distributing module from a tank area through an ammonia water delivery pump, enters an ammonia injection system after metering and blending, enters an ammonia evaporator body through compressed air atomization and injection, is mixed and evaporated with pressurized hot air in an evaporator, and is changed into ammonia gas/air/water vapor mixed gas which is delivered to an SCR reactor. In general, hot air is introduced from an upper air preheater of a boiler, but in the case that some heating hot water boilers do not have air preheaters, outdoor air needs to be introduced into an ammonia water evaporator through a dilution fan and an air heating device.

At present, the air heating device is mainly an electric heater, a gas-gas heat exchanger and other heat exchange devices, but: firstly, the electric heater is generally high in purchase cost and electric power (taking a 99MW hot water boiler as an example, the power of the electric heater is 250kW), the requirement on the configuration of electric equipment is high, and the later maintenance is complex; secondly, the traditional gas-gas heat exchanger is an independent unit, the heat exchange area is large, the occupied space is large, and the arrangement is difficult for some old heating boiler rooms, so that the flue gas heater device for the SCR denitration ammonia water dilution system is designed to solve the problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: in order to solve the problems in the background art, the utility model provides a flue gas heater device for an SCR denitration ammonia water dilution system.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a flue gas heater device for SCR denitration aqueous ammonia dilution system, includes the ammonia evaporator body, this internal flue gas heater that is used for carrying out the heating to the air that is provided with of ammonia evaporator, flue gas heater includes that a plurality of equidistant horizontal arrangements set up this internal and the heat exchange tube that is vertical direction of ammonia evaporator, a plurality of pipe brackets of inner wall fixedly connected with of ammonia evaporator body, every the heat exchange tube is fixed grafting respectively in the pipe bracket that corresponds, fixed mounting has the dilution fan that is located under the flue gas heater and is used for discharging the air to the flue gas heater direction on the ammonia evaporator body.

Further, the distance between every two adjacent heat exchange tubes is 0.5-1 cm.

Furthermore, the pipe bracket is connected with a fixing bolt in an inserting mode through threads, and one end of the fixing bolt abuts against the outer peripheral side of the heat exchange pipe.

Furthermore, one end of the fixing bolt, which is far away from the heat exchange tube, is fixedly connected with a handle.

Furthermore, the upper end and the lower end of the heat exchange tube are both fixedly provided with end plates, and the end plates comprise flange plates.

Furthermore, the air inlet of the dilution fan is positioned outside the ammonia evaporator body, and the air outlet of the dilution fan is positioned inside the ammonia evaporator body.

Compared with the prior art, the utility model has the beneficial effects that:

this scheme is compared the installation more traditional gas heat exchanger nimble, and optional space of mounted position is big, does not occupy the entity space to can replace electric heater, practice thrift the energy consumption, the heat exchange tube is the fluorescent tube formula simultaneously, and because it is vertical direction range distribution, can effectual prevention and cure deposition, need not set up ash removal device alone, play the convenient stability of operation, non-maintaining effect at ordinary times.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic view of the installation location of the flue gas heater of the present invention;

FIG. 2 is a schematic diagram of the flue gas heater of the present invention;

in the figure: 1. a flue gas heater; 11. a heat exchange pipe; 12. an end plate; 13. a pipe bracket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the flue gas heater device for an SCR denitration ammonia water dilution system provided by the present embodiment comprises an ammonia evaporator body, a flue gas heater 1 for heating air is arranged in the ammonia evaporator body, the flue gas heater 1 comprises a plurality of heat exchange tubes 11 which are arranged horizontally in the ammonia evaporator body at equal intervals and are in a vertical direction, the inner wall of the ammonia evaporator body is fixedly connected with a plurality of tube brackets 13, each heat exchange tube 11 is respectively and fixedly inserted in the corresponding tube bracket 13, a dilution fan which is positioned right below the flue gas heater 1 and is used for discharging air to the flue gas heater 1 is fixedly installed on the ammonia evaporator body, the flue gas heater 1 is a different form of a gas-gas heat exchanger and can be placed in the flue of the ammonia evaporator body, the upper part and the lower part of a catalyst, and above an upper-level coal economizer, the mounted position is nimble can be confirmed according to on-the-spot actual mounted position, the air can rise to more than 250 ℃ through heat exchange tube 11 back temperature, and the gas mixture that flows through directly over heat exchange tube 11 heats, make it enough satisfy aqueous ammonia gasification temperature requirement, this scheme is more traditional gas heat exchanger than the installation flexibility, the optional space of mounted position is big, do not occupy the entity space, and can replace electric heater, practice thrift the energy consumption, heat exchange tube 11 is the plain tube formula simultaneously, and because it is vertical direction range distribution, can effectual prevention and cure deposition, need not set up ash removal device alone, play convenient operation stability, non-maintaining's effect at ordinary times.

Specifically, the distance between every two adjacent heat exchange tubes 11 is 0.5-1cm, and the design enables air to flow through the heat exchange tubes 11, so that the contact area between the air and the heat exchange tubes 11 is increased, and the efficiency of heating the air is improved.

Regarding the specific mounting means of heat exchange tube 11 as follows, be connected with fixing bolt through the screw thread interlude on the conduit saddle 13, fixing bolt's one end is contradicted at the periphery side of heat exchange tube 11, fixing bolt keeps away from the one end fixedly connected with handle of heat exchange tube 11, conduit saddle 13 is the half-circular arc structure, such design can be more reasonable, heat exchange tube 11 pegs graft in conduit saddle 13 after, hold the handle and rotate with the hand, can make fixing bolt contradict on heat exchange tube 11 surface or break away from conduit saddle 13, the fixed or the pine of heat exchange tube 11 has been accomplished, so that the quick installation and the dismantlement of heat exchange tube 11.

And in addition, to the different problem of the required heat exchange tube 11 length of different installation regions, the upper and lower both ends of heat exchange tube 11 all are fixed and are provided with end plate 12, and end plate 12 includes the ring flange, like this, can splice a plurality of heat exchange tubes 11 through the ring flange, makes the length of heat exchange tube 11 can change according to the installation demand.

Meanwhile, the reason that the dilution fan can discharge air towards the direction of the heat exchange tube 11 is as follows, the air inlet of the dilution fan is positioned outside the ammonia evaporator body, the air outlet of the dilution fan is positioned inside the ammonia evaporator body, after the dilution fan sucks outdoor air into the ammonia evaporator body, the outdoor air can be upwards discharged in the ammonia evaporator body through the air outlet of the dilution fan, the outdoor air can be heated through the heat exchange tube 11 and finally mixed with mixed gas, and the design is more reasonable.

The dilution fan and the heat exchange tube 11 are both the prior art, the specific structure, the control and the power supply of the dilution fan and the heat exchange tube are both the prior mature technology, and are not further explained in the application.

In the device, all electric devices and drivers matched with the electric devices are arranged at the idle position, and all driving parts, namely power elements, the electric devices and adaptive power supplies, are connected through leads by a person skilled in the art, and specific connecting means refer to the above expression that the electric devices are electrically connected in sequence, and detailed connecting means thereof are well known in the art.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a flue gas heater device for SCR denitration aqueous ammonia dilution system, includes the ammonia evaporator body, its characterized in that, this internal flue gas heater (1) that is used for carrying out the heating to the air that is provided with of ammonia evaporator, flue gas heater (1) include a plurality of equidistant horizontal arrangement set up this internal heat exchange tube (11) that are vertical direction of ammonia evaporator, a plurality of pipe brackets (13) of inner wall fixedly connected with of ammonia evaporator body, every heat exchange tube (11) are fixed grafting respectively in pipe bracket (13) that correspond, fixed mounting has the dilution fan that is located under flue gas heater (1) and is used for discharging the air to flue gas heater (1) direction on the ammonia evaporator body.

2. The flue gas heater device for the SCR denitration ammonia water dilution system of claim 1, wherein the distance between every two adjacent heat exchange tubes (11) is 0.5-1 cm.

3. The flue gas heater device for the SCR denitration ammonia water dilution system of claim 1, wherein a fixing bolt is inserted and connected to the pipe bracket (13) through a thread, and one end of the fixing bolt is abutted against the outer peripheral side of the heat exchange pipe (11).

4. The flue gas heater device for the SCR denitration ammonia water dilution system of claim 3, wherein one end of the fixing bolt far away from the heat exchange tube (11) is fixedly connected with a handle.

5. The flue gas heater device for the SCR denitration ammonia water dilution system of claim 1, wherein the upper and lower ends of the heat exchange tube (11) are both fixedly provided with end plates (12), and the end plates (12) comprise flanges.

6. The flue gas heater device for the SCR denitration ammonia water dilution system of claim 1, wherein an air inlet of the dilution fan is located outside the ammonia evaporator body, and an air outlet of the dilution fan is located inside the ammonia evaporator body.