CN217139910U

CN217139910U - Calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system

Info

Publication number: CN217139910U
Application number: CN202123034574.5U
Authority: CN
Inventors: 郑勇; 武军; 张亚红; 邢可虎
Original assignee: Anhui Fangxin Lihua Environmental Protection Technology Co ltd; Tongxing Environmental Protection Technology Co ltd
Current assignee: Anhui Fangxin Lihua Environmental Protection Technology Co ltd; Tongxing Environmental Protection Technology Co ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-08-09
Anticipated expiration: 2031-12-03

Abstract

The utility model provides a calcium-based rotary spraying semi-dry desulfurization, dust removal and low-temperature SCR denitration system, which relates to the technical field of flue gas treatment, and comprises a desulfurization tower and a bag-type dust remover, wherein the outlet end of the desulfurization tower is connected with the inlet end of the bag-type dust remover, the outlet end of the bag-type dust remover is connected with the inlet end of low-temperature SCR denitration equipment, a flue gas heating system is arranged at the joint of the outlet end of the bag-type dust remover and the inlet end of the low-temperature SCR denitration equipment, the outlet end of the low-temperature SCR denitration equipment is connected with a draught fan, and the outlet end of the draught fan is connected with the inlet end of a chimney; the utility model discloses a rearmounted low temperature SCR denitration, leading desulfurization is removed dust and is had the guard action to the catalyst, and the catalyst life-span is high.

Description

Calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system

Technical Field

The utility model relates to a flue gas treatment technical field, concretely relates to calcium-based rotary spraying semi-dry desulfurization dust removal low temperature SCR deNOx systems.

Background

In recent years, with the deepening of the public environmental protection concept and the continuous improvement of the national environmental management system, the green sustainable development becomes one of the important concepts of the current social and economic development. Sulfur dioxide and nitrogen oxides, which are one of the main pollutants in the atmosphere, are important indicators for determining whether the atmosphere is polluted or not. In the past, many countries and regions in the world have suffered from serious hazardous events caused by sulfur dioxide pollution, resulting in a great deal of casualties and economic losses.

Sulfur dioxide and nitrogen oxides are mainly derived from fuel combustion in the production process of factories, and if the flue gas is discharged into the atmosphere without being treated, the flue gas causes huge pollution to the atmosphere and seriously harms the health of people.

The traditional wet desulphurization process has the advantages of high investment, complex system, difficult maintenance, wastewater generation, white elimination again, easy catalyst blockage and unstable denitration operation due to the traditional preposed SCR denitration.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, a calcium base rotary spraying semi-dry desulfurization dust removal low temperature SCR deNOx systems is provided.

The utility model discloses a following technical means realizes solving above-mentioned technical problem: the utility model provides a rotatory semidry desulfurization of spraying of calcium base removes dust low temperature SCR deNOx systems, includes desulfurizing tower and sack cleaner, the desulfurizing tower exit end is connected with sack cleaner entry end, sack cleaner exit end and low temperature SCR deNOx systems entrance connection department are provided with flue gas heating system, and low temperature SCR deNOx systems exit end is connected with the draught fan, and the draught fan exit end is connected with the chimney entry end.

Further, the outlet end of the bag-type dust collector is connected with the raw flue gas inlet end of the flue gas heat exchanger, the raw flue gas outlet end of the flue gas heat exchanger is connected with the inlet end of the low-temperature SCR denitration device, and the outlet end of the low-temperature SCR denitration device is communicated with the clean flue gas inlet end of the flue gas heat exchanger.

Further, the clean smoke outlet end of the smoke heat exchanger is connected with the inlet end of an induced draft fan; and the outlet end of the induced draft fan is connected with the inlet end of the chimney.

Furthermore, an inlet end of the desulfurizing tower is connected with a waste heat boiler.

Furthermore, the connection among the exhaust-heat boiler, the desulfurizing tower, the bag-type dust collector, the flue gas reheater, the low-temperature SCR denitration device, the draught fan and the chimney is communicated through a flue.

The utility model has the advantages that:

(1) the utility model discloses deNOx systems adopts rearmounted low temperature SCR denitration, and leading desulfurization is removed dust and is had the guard action to the catalyst, and the catalyst is longe-lived.

(2) Compared with the traditional wet desulphurization, the denitration system of the utility model can not generate waste water, has simple system setting, low investment, higher flue gas temperature than the wet desulphurization, can not generate white fog above the flue gas dew point temperature, has little corrosion to equipment and is easy to maintain; and secondly, low-temperature SCR denitration is adopted, so that the equipment occupies a small area, and the operating cost is greatly reduced compared with that of the traditional medium-high temperature SCR denitration.

Drawings

FIG. 1 is a schematic diagram of a calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system.

The reference numerals in the drawings denote: 1. a flue; 2. a waste heat boiler; 3. a desulfurizing tower; 4. a bag-type dust collector; 5. a flue gas heat exchanger; 6. a flue gas heating system; 7. low-temperature SCR denitration equipment; 8. an induced draft fan; 9. and (4) a chimney.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Examples

As can be seen from figure 1, the calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system comprises a flue 1, a waste heat boiler 2, a desulfurization tower 3, a bag-type dust remover 4, a flue gas heat exchanger 5, a flue gas heating system 6, low-temperature SCR denitration equipment 7, an induced draft fan 8 and a chimney 9; the connection between the waste heat boiler 2, the desulfurizing tower 3, the bag-type dust collector 4, the flue gas heat exchanger 5, the low-temperature SCR denitration device 7, the induced draft fan 8 and the chimney 9 is communicated through the flue 1, so that the whole system is communicated.

The outlet end of the waste heat boiler 2 is connected with the inlet end of the upper part of the desulfurizing tower 3; and the outlet end of the lower part of the desulfurizing tower 3 is connected with the inlet end of a bag-type dust collector 4.

Before the flue gas gets into desulfurizing tower 3, need retrieve the heat through exhaust-heat boiler 2, adjust the temperature of flue gas, make the flue gas temperature be in calcium base desulfurization's optimum scope, improve desulfurization reaction efficiency, then the flue gas gets into desulfurizing tower 3, sulfur dioxide and other acid gas in the flue gas are by preliminary desorption in desulfurizing tower 3, the flue gas after desulfurizing tower 3 handles gets into sack cleaner 4, unreacted sulfur dioxide and lime powder in the flue gas of 3 preliminary desorption of desulfurizing tower, secondary desulfurization takes place in sack cleaner 4, step-by-step formula is handled the flue gas, promote the desulfurization effect of flue gas, secondly filter the dust in the flue gas in sack cleaner 4, make the dust up to standard discharge in the flue gas, and protect follow-up low temperature SCR denitration device 7 and gas heat exchanger 5.

The waste heat boiler 2 is specifically arranged according to the temperature condition of the flue gas, when the temperature of the flue gas is higher, the waste heat boiler 2 can reduce the temperature of the flue gas and reduce the spraying amount, otherwise, the arrangement of the waste heat boiler 2 can be cancelled; the waste heat boiler 2 absorbs waste heat in waste gas, waste materials or waste liquid in the industrial process and heat generated after combustible substances are combusted, steam is generated for production, heat energy is fully utilized, energy is saved, environment is protected, and the cost of desulfurization and denitrification of flue gas can be reduced.

4 exit ends of bag-type dust collectors are connected with 7 entrance connections of low temperature SCR denitration device, and 7 exit ends of low temperature SCR denitration device are provided with draught fan 8, and 8 exit ends of draught fan are connected with 9 entry ends of chimney, and 4 exit ends of bag-type dust collectors are provided with flue gas heating system 6 with 7 entrance connections of low temperature SCR denitration device, and flue gas heating system 6 is used for heating up the flue gas that gets into low temperature SCR denitration device 7.

In order to reduce the load of the flue gas heating system 6, save the gas consumption and reduce the operation cost, the outlet end of the bag-type dust remover 4 is connected with the original flue gas inlet end of the flue gas reheater 5; the raw flue gas outlet end of the flue gas reheater 5 is connected with the inlet end of the low-temperature SCR denitration device 7, and the outlet end of the low-temperature SCR denitration device 7 is communicated with the clean flue gas inlet end of the flue gas reheater 5; and a clean flue gas outlet end of the flue gas reheater 5 is connected with an inlet end of an induced draft fan 8.

Flue gas treated by the bag-type dust collector 4 enters the flue gas heat exchanger 5, the flue gas flows in the flue gas heat exchanger 5, the flue gas enters the low-temperature SCR denitration device 7 through the original flue gas outlet end of the flue gas heat exchanger 5, the flue gas is denitrated by the low-temperature SCR denitration device 7, the clean flue gas after denitration treatment is discharged through the outlet end of the low-temperature SCR denitration device 7, the clean flue gas flows at the clean flue gas outlet end of the flue gas heat exchanger 5 and flows inside the clean flue gas outlet end, the heat of the clean flue gas after desulfurization and denitration is recycled and acts on the flue gas at the inlet end of the low-temperature SCR denitration device 7, the temperature of the flue gas entering the low-temperature SCR denitration device 7 is increased, the corrosion of the flue gas to the low-temperature SCR denitration device 7 is reduced, the activity of a denitration catalyst in the low-temperature SCR denitration device is increased, the denitration efficiency of a system is increased, the waste heat is fully utilized again, and the desulfurization and denitration cost of the flue gas is further reduced.

The temperature of the low-temperature SCR denitration device 7 can be as low as 180 ℃, the smoke amount under the working condition is small, the resistance of the device is small, the running power of the induced draft fan 8 is lower, and the energy and the electricity are saved; the resistance of each device is overcome by the induced draft fan 8.

Compared with the traditional wet desulphurization, the denitration system of the utility model can not generate waste water, has simple system setting, low investment, higher flue gas temperature than the wet desulphurization, can not generate white fog above the flue gas dew point temperature, has little corrosion to equipment and is easy to maintain; the requirement on the temperature of the flue gas is not high, and the prepositive waste heat boiler can produce economic benefit.

The rear-mounted low-temperature SCR denitration is adopted, the front-mounted desulfurization and dust removal has a protective effect on the catalyst, and the service life of the catalyst is long; and secondly, low-temperature SCR denitration is adopted, so that the equipment occupies a small area, and the operating cost is greatly reduced compared with that of the traditional medium-high temperature SCR denitration.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system is characterized in that: including desulfurizing tower (3) and sack cleaner (4), desulfurizing tower (3) exit end is connected with sack cleaner (4) entry end, sack cleaner (4) exit end and low temperature SCR denitration device (7) entrance connection, sack cleaner (4) exit end is provided with flue gas heating system (6) with low temperature SCR denitration device (7) entrance connection department, and low temperature SCR denitration device (7) exit end is connected with draught fan (8), and draught fan (8) exit end is connected with chimney (9) entry end.

2. The calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system as claimed in claim 1, is characterized in that: the outlet end of the bag-type dust collector (4) is connected with the original flue gas inlet end of the flue gas heat exchanger (5), the original flue gas outlet end of the flue gas heat exchanger (5) is connected with the inlet end of the low-temperature SCR denitration device (7), and the outlet end of the low-temperature SCR denitration device (7) is communicated with the clean flue gas inlet end of the flue gas heat exchanger (5).

3. The calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system as claimed in claim 2, is characterized in that: the clean smoke outlet end of the smoke heat exchanger (5) is connected with the inlet end of a draught fan (8); the outlet end of the induced draft fan (8) is connected with the inlet end of the chimney (9).

4. The calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system as claimed in claim 1, is characterized in that: and the inlet end of the desulfurizing tower (3) is connected with a waste heat boiler (2).

5. The calcium-based rotary spraying semi-dry desulfurization and dust removal low-temperature SCR denitration system as claimed in claim 4, is characterized in that: the waste heat boiler (2), the desulfurizing tower (3), the bag-type dust collector (4), the flue gas heat exchanger (5), the low-temperature SCR denitration device (7), the draught fan (8) and the chimney (9) are all communicated through the flue (1).