WO2022262243A1

WO2022262243A1 - Flue gas ammonia removal method

Info

Publication number: WO2022262243A1
Application number: PCT/CN2021/140904
Authority: WO
Inventors: 陈壁; 肖亮; 姜胜男; 陈镖
Original assignee: 深圳华明环保科技有限公司
Priority date: 2021-06-15
Filing date: 2021-12-23
Publication date: 2022-12-22
Also published as: CN113426268A

Abstract

Disclosed is a flue gas ammonia removal method. In a boiler, nitrogen oxides in a flue gas to be treated as produced by the boiler are subjected to denitration treatment to obtain a denitrated flue gas containing ammonia gas and an acidic gas; the denitrated flue gas is drained to a deacidification tower and the acidic gas in the denitrated flue gas is subjected to deacidification treatment in the deacidification tower to obtain a deacidified flue gas containing solid dust and ammonia gas; the deacidified flue gas is drained to a bag-type dust remover, and the solid dust in the deacidified flue gas is subjected to dust removal treatment by means of the bag-type dust remover to obtain a dust removal flue gas containing ammonia gas; and the dust removal flue gas is drained to a deamination reactor, and the ammonia gas in the dust removal flue gas is subjected to deamination treatment in the deamination reactor to obtain a dischargeable flue gas.

Description

Flue gas ammonia removal method

This application claims the priority of Chinese Patent Application No. 202110663927.3 filed on June 15, 2021, the entire contents of which are hereby incorporated by reference.

technical field

The present application relates to the field of waste gas treatment, in particular to a method for removing ammonia from flue gas.

Background technique

With the increasingly severe environmental protection, the requirements for the emission of nitrogen oxides produced by waste incineration are getting higher and higher. When the flue gas generated in the waste incineration process is denitrified, the flue gas will be sprayed with denitrification agent. Due to uncertainty The content of nitrogen oxides in the flue gas. Therefore, an excessive amount of denitrification agent is generally sprayed on the flue gas, which also causes the denitrification agent that has not reacted with the nitrogen oxides in the flue gas to escape ammonia. The existing treatment for ammonia escape is generally After the denitration treatment, deacidification treatment and dust removal treatment, the method of washing with water is used to remove the ammonia in the flue gas into the waste water, and then treat the waste water. The existing way of treating the escape of ammonia through water washing increases the waste water. The process of processing is more complicated.

technical problem

The main purpose of this application is to provide a method for removing ammonia from flue gas, which aims to solve the existing technical problems of additional wastewater treatment and complicated process when treating ammonia in dust removal flue gas by water washing.

technical solution

In order to achieve the above purpose, the embodiment of the present application provides a flue gas ammonia removal method, the flue gas ammonia removal method is applied to the flue gas ammonia removal system, and the flue gas ammonia removal system includes a boiler, a deacidification tower , bag dust collector and deamination reactor, described flue gas ammonia removal method comprises:

In the boiler, the nitrogen oxides in the flue gas to be treated produced by the boiler are denitrated to obtain denitrated flue gas containing ammonia and acid gas;

diverting the denitrification flue gas to the deacidification tower, and deacidifying the acid gas in the denitrification flue gas in the deacidification tower to obtain deacidification flue gas containing solid dust and the ammonia gas ;

Draining the deacidification flue gas to the bag filter, and performing dedusting treatment on the solid dust in the deacidification flue gas through the bag filter to obtain dedusting flue gas containing the ammonia gas;

The dedusting flue gas is diverted into the deamination reactor, and the ammonia in the dust removal flue gas is deammonized in the deamination reactor to obtain exhaustable flue gas.

In one embodiment, the space within the temperature range of 800°C to 1150°C in the boiler is defined as the target space, and in the boiler, nitrogen oxides in the flue gas to be treated produced by the boiler are Denitration treatment, the steps of obtaining denitrification flue gas containing ammonia and acid gas include:

Spray an amino reducing agent on the flue gas to be treated flowing through the target space to obtain denitration flue gas containing ammonia and acid gas, wherein the amino reducing agent includes one or more of ammonia, ammonia water, urea and melamine Various.

In one embodiment, the temperature of the target space is in the range of 900°C to 1100°C, the amino reducing agent is ammonia gas and/or ammonia water, and the spraying of the untreated flue gas flowing through the target space Amino reducing agent, the steps to obtain the denitrification flue gas containing ammonia and acid gas include:

spraying the ammonia gas and/or the ammonia water to the flue gas to be treated flowing through the target space, and reacting the ammonia gas and/or the ammonia water with the nitrogen oxides in the flue gas to be treated to obtain Denitration flue gas containing nitrogen, ammonia, acid gases and water vapor.

In one embodiment, the temperature of the target space is in the range of 900°C to 1150°C, the amino reducing agent is urea, and the amino reducing agent is sprayed to the flue gas to be treated flowing through the target space to obtain The step of denitration flue gas containing ammonia gas and acid gas also includes:

Spraying the urea to the flue gas to be treated flowing through the target space, through the reaction of the urea with the nitrogen oxides in the flue gas to be treated, a denitrification system containing nitrogen, carbon dioxide, ammonia, acid gas and water vapor is obtained. smoke.

In one embodiment, the denitrification flue gas is washed with water to obtain the denitrification washed flue gas, and the denitrification water washed flue gas is diverted to the deacidification tower, and the denitrification tower is denitrated in the denitrification tower. The acid gas in the flue gas is deacidified, and the steps of obtaining the deacidified flue gas containing solid dust and the ammonia include:

The denitrification flue gas washed with water is diverted to a deacidification tower, and the denitrification flue gas is deacidified in the deacidification tower to obtain deacidification flue gas containing solid dust and the ammonia gas.

In one embodiment, the denitrification flue gas is diverted to the deacidification tower, and the acid gas in the denitrification flue gas is deacidified in the deacidification tower to obtain solid dust and the The step of the deacidification flue gas of described ammonia comprises:

The denitration flue gas is diverted to the deacidification tower, and the deacidification agent is sprayed on the denitrification flue gas in the deacidification tower through the feeder in the deacidification tower to obtain solid dust and the Ammonia deacidification flue gas.

In one embodiment, when the deacidification tower is a dry deacidification tower, the deacidification agent is sodium bicarbonate powder and/or slaked lime;

When the deacidification tower is a semi-dry deacidification tower, the deacidification agent is lime slurry.

In one embodiment, the deacidification flue gas is diverted to the bag filter, and the solid dust in the deacidification flue gas is dedusted by the bag filter to obtain the ammonia gas containing The steps of dust removal flue gas include:

Draining the deacidified flue gas to the settling space in the bag filter, and filtering coarse dust particles to obtain deacidified flue gas containing fine dust particles;

The deacidified flue gas containing fine dust particles is diverted through the filter bag in the bag filter to obtain dedusted flue gas containing the ammonia gas.

In one embodiment, the dedusting flue gas is diverted into the deamination reactor, and the ammonia in the dedusting flue gas is deammonized in the deamination reactor to obtain a dischargeable The steps of flue gas include:

The dedusting flue gas is diverted into the deamination reactor, and the ammonia washing liquid is sprayed on the dust removal flue gas to obtain exhaustable flue gas, wherein the ammonia washing liquid includes one of heavy metal catalysts, activated carbon and acidic substances or more.

In one embodiment, the deamination reactor is a deamination reactor in the form of a fixed bed or a deamination reactor in the form of a fluid bed.

Beneficial effect

The embodiment of the present application provides a flue gas ammonia removal method, the flue gas ammonia removal method is applied to the flue gas ammonia removal system, and the flue gas ammonia removal system includes a boiler, a deacidification tower, a bag filter and The deamination reactor, in the boiler, denitrates the nitrogen oxides in the untreated flue gas produced by the boiler to obtain the denitrification flue gas containing ammonia and acid gas; the denitrification flue gas is diverted to the deacidification tower, and the The acid gas in the denitrification flue gas is deacidified in the acid tower to obtain the deacidified flue gas containing solid dust and ammonia; the deacidified flue gas is diverted to the bag filter, and the deacidified flue gas The solid dust is dedusted to obtain dedusted flue gas containing ammonia; the dedusted flue gas is diverted to the deamination reactor, and the dust-removed flue gas is deaminated in the deamination reactor to obtain exhaustable flue gas. The ammonia gas in the dust removal flue gas can be deammonized only through the deamination reactor, which avoids the problems of additional wastewater treatment and complicated process when the ammonia gas in the dust removal flue gas is treated by water washing.

Description of drawings

Fig. 1 is a schematic flow chart of the first embodiment of the flue gas ammonia removal method of the present application.

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Embodiments of the present invention

It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

As shown in Figure 1, the first embodiment of the present application proposes a method for removing ammonia from flue gas, and the method for removing ammonia from flue gas includes:

Step S10, in the boiler, denitrate the nitrogen oxides in the untreated flue gas generated by the boiler to obtain denitrated flue gas containing ammonia and acid gas.

It is understandable that in the process of incinerating garbage, a lot of flue gas that pollutes the environment will be produced. If these flue gases are directly discharged into the air, it will cause environmental pollution. deal with.

The process of treating flue gas produced by incineration of garbage generally includes denitration treatment, deacidification treatment and dust removal treatment. The purpose of denitrification treatment is to remove nitrogen oxides (such as nitrogen monoxide and nitrogen dioxide, etc.) in the flue gas produced by garbage incineration , deacidification treatment refers to the removal of acid gases such as sulfur dioxide and hydrogen chloride in the flue gas produced by waste incineration, while dust removal treatment refers to the removal of particulate matter in the flue gas produced by waste incineration, and denitration treatment of the flue gas produced by waste incineration and particulate matter generated during the deacidification process. The process of denitrification treatment of the flue gas produced by waste incineration is carried out in the boiler of waste incineration. The ammonia reducing agent is sprayed on the flue gas generated by waste incineration through the spraying equipment in the boiler, and the reaction between the amino reducing agent and nitrogen oxides , to generate nitrogen that is not polluting to the environment.

Further, the space in which the temperature in the boiler is within the range of 800°C to 1150°C is defined as the target space, and the refinement steps in step S10 include:

Step S11, spraying an amino reducing agent on the flue gas to be treated flowing through the target space to obtain denitration flue gas containing ammonia and acid gas, wherein the amino reducing agent includes ammonia, ammonia water, urea and melamine one or more.

The existing denitrification treatment includes two methods, namely SNCR (selective non-catalytic reduction, selective non-catalytic reduction) and SCR (selective Catalytic reduction, selective catalytic reduction) The flue gas ammonia removal method in this example adopts the SNCR method. Selective non-catalytic reduction means that no catalyst is needed, and only the amino reducing agent needs to be sprayed in the temperature window suitable for the denitrification reaction. In order to achieve the purpose of reducing the nitrogen oxides in the flue gas to harmless nitrogen and water, the temperature window refers to the space in the boiler where the temperature is within the temperature range of 800°C to 1150°C, which is the goal in this embodiment Space, the reason why this embodiment limits the high temperature window is because the SNCR method does not require a catalyst, so the reduction reaction can be carried out better only in a high temperature environment. The amino reducing agent required by the SNCR method includes ammonia, ammonia water One or more of nitrogen-containing substances such as urea, melamine, etc. Since the content of nitrogen oxides in the flue gas to be treated is unknown, the use of amino reducing agents is generally excessive. Ammonia gas is generated under the action. Excessive ammonia gas has no nitrogen oxide compounds to react, or it is too late to react with nitrogen oxide compounds, resulting in excess ammonia gas escaping. Ammonia gas is also a substance that pollutes the environment, which is also the technical problem to be solved by this scheme origin.

Further, the temperature of the target space is in the range of 900°C to 1100°C, the amino reducing agent is ammonia gas and/or ammonia water, and the refinement of step S10 includes:

Step S12, spraying the ammonia gas and/or the ammonia water to the flue gas to be treated flowing through the target space, through the ammonia gas and/or the ammonia water and the nitrogen oxides in the flue gas to be treated reaction to obtain denitration flue gas containing nitrogen, ammonia, acid gas and water vapor.

When the amino reducing agent is ammonia gas or ammonia water, the optimal reduction temperature is 900°C to 1100°C. In this temperature range, the chemical formula of the amino reducing agent reacting with nitrogen oxides is: (1) 4NH3 + 4NO+ O2 → 4N2 + 6H2O (2) 4NH3 + 2NO+ 2O2 → 3N2 + 6H2O (3) 8NH3 + 6NO2 → 7N2 + 12H2O, from the above formula, it can be seen that ammonia or ammonia water reacts with nitrogen oxides to generate nitrogen that is harmless to the environment and water (in the form of steam), because the content of nitrogen oxides in the flue gas to be treated is unknown, the spraying amount of amino reducing agent is generally very large, which also causes the problem of excessive NH3 escape. The denitrification flue gas containing nitrogen and water vapor is obtained through treatment.

Further, the temperature of the target space is in the range of 900°C to 1150°C, the amino reducing agent is urea, and the refinement of step S10 includes:

Step S13, spraying the urea to the flue gas to be treated flowing through the target space, and reacting the urea with the nitrogen oxides in the flue gas to be treated to obtain a gas containing nitrogen, carbon dioxide, ammonia, acid gas and Water vapor denitrification flue gas.

When the amino reducing agent is urea, the optimum reduction temperature is 900°C to 1150°C. In this temperature range, the chemical formula of the amino reducing agent reacting with nitrogen oxides is: (1) CO(NH2 )2→2NH2 + CO (2) NH2 + NO→N2 + H2O (3) CO + NO→N2 + CO2, it can be seen from the above formula that after the reaction of urea and nitrogen oxides, environmentally friendly nitrogen, carbon dioxide and water (in the form of steam ), because the content of nitrogen oxides in the flue gas to be treated is unknown, when urea is used as an amino reducing agent, the amount of spraying is also large, which will also cause excessive urea.

Step S20, diverting the denitrification flue gas to the deacidification tower, and performing deacidification treatment on the acid gas in the denitrification flue gas in the deacidification tower, to obtain de-acidification gas containing solid dust and the ammonia gas. Acid fumes.

Further, the denitrification flue gas is washed with water to obtain the denitrification water-washed flue gas, and the refinement of step S20 includes:

Step S21, diverting the denitrification flue gas washed with water to a deacidification tower, and performing deacidification treatment on the denitrification flue gas in the deacidification tower to obtain deacidification flue gas containing solid dust and the ammonia gas.

It can be seen that the treatment of the denitrification flue gas obtained after the denitrification treatment (which contains the escaped ammonia produced by excessive amino reducing agents) can be washed with water or pickled, and the escaped ammonia can be dissolved in water or reacted with acid solution . Although the process of washing or pickling the denitrification flue gas is complex, the method of washing or pickling the denitrification flue gas obtained from the denitrification treatment cannot be ruled out. In this embodiment, the gas obtained after denitrification flue gas is washed with water or pickled is used as denitrification washed flue gas. The denitrification flue gas or denitrification washed flue gas also needs to be deacidified to remove sulfur dioxide or hydrogen chloride in the denitrification flue gas. Acid gas, in this embodiment, deacidification treatment is carried out by diverting the denitrification flue gas or denitrification water-washed flue gas to the deacidification tower. During the acid treatment, chemicals are also required. In this embodiment, the chemicals used in the deacidification treatment are called deacidification agents, and the gas obtained after the deacidification treatment is called deacidification flue gas.

Further, when the deacidification tower is a dry deacidification tower, the deacidification agent is sodium bicarbonate powder and/or slaked lime; when the deacidification tower is a semi-dry deacidification tower, the deacidification agent is The acid agent is lime slurry, and the steps of step S20 refinement include:

Step S22, diverting the denitrification flue gas to the deacidification tower, spraying a deacidification agent on the denitrification flue gas in the deacidification tower through a feeder in the deacidification tower, to obtain solid Dust and the deacidification flue gas of the ammonia gas.

It can be seen that the deacidification tower in this embodiment is divided into a dry deacidification tower and a semi-dry deacidification tower. When the deacidification tower is a dry deacidification tower, the deacidification agent required in the deacidification treatment is carbonic acid Sodium hydrogen powder and/or slaked lime (powder); when the deacidification tower is a semi-dry deacidification tower, the deacidification agent required in the deacidification treatment is lime slurry, whether it is a dry deacidification tower or a semi-dry deacidification tower There are feeders in the acid tower and deacidification tower. The feeder can spray the deacidification agent into the denitration flue gas, so that the deacidification agent can react with the acid gas in the denitrification flue gas. The deacidification agent and the denitrification fume The chemical equation of acid gas reaction in gas is: (1) 2HCl+Ca(OH)2=CaCl2+2H2O (2) SO2+Ca(OH)2=CaSO4+H2O, from the above formula, the deacidification agent and denitrification The acid gas in the flue gas reacts to generate water vapor that is harmless to the air, and calcium chloride (solid) and calcium sulfate (solid) that are convenient to handle. After deacidification of the denitrification flue gas, the deacidification flue gas is obtained.

In step S30, the deacidification flue gas is diverted to the bag filter, and the solid dust in the deacidification flue gas is dedusted by the bag filter to obtain dedusted flue gas containing the ammonia gas.

It can be seen that the above-mentioned deacidification flue gas obtained after the deacidification treatment of the denitrification flue gas contains solid substances such as calcium chloride and calcium sulfate, which exist in the deacidification flue gas in the form of dust. If the deacidification flue gas If the dust removal treatment is carried out, the solid dust in the deacidification flue gas will affect the subsequent deamination process (the solid dust may react with the chemical used in the deamination treatment), and if there is no dust removal treatment, the discharge of the solid dust will affect the environment. The value of PM2.5, therefore, it is necessary to dedust the deacidification flue gas. In this embodiment, a bag filter is used to dedust the deacidification flue gas. The flue gas obtained after the dust removal is the dedusted flue gas.

Further, the steps of step S30 refinement include:

Step S31 , diverting the deacidified flue gas to the settling space in the bag filter for filtering coarse dust particles to obtain deacidified flue gas containing fine dust particles.

Step S32, diverting the deacidified flue gas containing fine dust particles through the filter bag in the bag filter to obtain dedusted flue gas containing the ammonia gas.

It can be seen that the bag filter contains a settling space and a filter bag, and the deacidification flue gas first flows through the settling space, and in the settling space, the large dust particles (coarse dust particles in this example) in the deacidification flue gas will It falls into the dust collector of the bag filter under the action of gravity, and the deacidified flue gas after settlement will be diverted to the filter bag in the bag filter. It is understandable that the filter bag in the bag filter is composed of multiple layers. The filter screen is composed of different filter hole sizes. After the settled deacidification flue gas passes through the multi-layer filter screen, small particles of dust (fine dust particles in this example) will be adsorbed on the filter bag to complete deacidification. The flue gas is filtered to obtain dust-removed flue gas. It can be seen that the filter bag in the bag filter needs to be cleaned regularly to ensure its filtering ability.

In step S40, the dedusting flue gas is diverted into the deamination reactor, and the ammonia in the dust removal flue gas is deammonized in the deamination reactor to obtain exhaustable flue gas.

The ammonia escape problem caused by the above-mentioned denitrification process can also be solved by increasing the deammonization process. Specifically, in this embodiment, a deammonization reactor is added after the bag filter to eliminate the ammonia escape in the dust removal flue gas. Similar to the above-mentioned flue gas treatment, the deamination treatment in this embodiment is also by spraying liquid into the dust removal flue gas, through the substances in the liquid that can react with ammonia, or can catalyze ammonia and dust removal flue gas The substances reacted with other substances, and deamination treatment is carried out on the dust removal flue gas to obtain the flue gas that can be discharged.

Further, the deamination reactor is a deamination reactor in the form of a fixed bed or a deamination reactor in the form of a fluid bed, and the refinement steps of step S40 include:

Step S41, diverting the dust-removing flue gas into a deamination reactor, spraying ammonia washing liquid on the dust-removing flue gas to obtain exhaustable flue gas, wherein the ammonia washing liquid includes heavy metal catalysts, activated carbon and acidic substances one or more of .

The deamination reactor in this embodiment can be a deamination reactor in the form of a fixed bed, and can also be a deamination reactor in the form of a fluid bed. Ammonia washing liquid is sprayed with air, wherein, the ammonia washing liquid contains one or more combinations of substances that can absorb ammonia such as heavy metal catalysts, activated carbon and acidic substances. After deammonization treatment, the ammonia content meets the standard. Can emit fumes.

This embodiment provides a flue gas ammonia removal method. The flue gas ammonia removal method is applied to a flue gas ammonia removal system. The flue gas ammonia removal system includes a boiler, a deacidification tower, a bag filter, and a ammonia removal reaction. In the boiler, the nitrogen oxides in the untreated flue gas produced by the boiler are denitrified to obtain denitrification flue gas containing ammonia gas and acid gas; the denitrification flue gas is diverted to the deacidification tower, and the The acid gas in the denitrification flue gas is deacidified to obtain the deacidified flue gas containing solid dust and ammonia; the deacidified flue gas is diverted to the bag filter, and the solid dust in the deacidified flue gas is removed Dust removal treatment is carried out to obtain dust removal flue gas containing ammonia; the dust removal flue gas is diverted to a deammonization reactor, and the dust removal flue gas is subjected to deammonization treatment in the deamination reactor to obtain exhaustable flue gas. The ammonia gas in the dust removal flue gas can be deammonized only through the deamination reactor, which avoids the problems of additional wastewater treatment and complicated process when the ammonia gas in the dust removal flue gas is treated by water washing.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

The serial numbers of the above embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on this understanding, the essence of the technical solution of this application or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD-ROM), including several instructions to enable a terminal device (which can be a fixed terminal, such as IoT smart devices, including smart air conditioners, smart lights, smart power supplies, smart routers, etc. Mobile phones, wearable networked AR/VR devices, smart speakers, self-driving cars and many other networked devices) perform the methods for removing ammonia from flue gas described in various embodiments of the present application.

The above are only optional embodiments of the application, and are not intended to limit the patent scope of the application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims

A flue gas ammonia removal method, wherein the flue gas ammonia removal method is applied to a flue gas ammonia removal system, and the flue gas ammonia removal system includes a boiler, a deacidification tower, a bag filter and a deammonization reaction device, the flue gas ammonia removal method includes:

In the boiler, the nitrogen oxides in the flue gas to be treated produced by the boiler are denitrated to obtain denitrated flue gas containing ammonia and acid gas;

diverting the denitrification flue gas to the deacidification tower, and deacidifying the acid gas in the denitrification flue gas in the deacidification tower to obtain deacidification flue gas containing solid dust and the ammonia gas ;

Draining the deacidification flue gas to the bag filter, and performing dedusting treatment on the solid dust in the deacidification flue gas through the bag filter to obtain dedusting flue gas containing the ammonia gas;

The dedusting flue gas is diverted into the deamination reactor, and the ammonia in the dust removal flue gas is deammonized in the deamination reactor to obtain exhaustable flue gas.
The flue gas ammonia removal method according to claim 1, wherein the space within the temperature range of 800°C to 1150°C in the boiler is defined as the target space, and in the boiler, the The nitrogen oxides in the flue gas to be treated are subjected to denitrification treatment, and the steps of obtaining denitrification flue gas containing ammonia gas and acid gas include:

Spray an amino reducing agent on the flue gas to be treated flowing through the target space to obtain denitration flue gas containing ammonia and acid gas, wherein the amino reducing agent includes one or more of ammonia, ammonia water, urea and melamine Various.
The flue gas ammonia removal method according to claim 2, wherein the temperature of the target space is in the range of 900°C to 1100°C, the amino reducing agent is ammonia gas and/or ammonia water, and the The steps of spraying amino reducing agent on the flue gas to be treated in the target space to obtain denitration flue gas containing ammonia gas and acid gas include:

spraying the ammonia gas and/or the ammonia water to the flue gas to be treated flowing through the target space, and reacting the ammonia gas and/or the ammonia water with the nitrogen oxides in the flue gas to be treated to obtain Denitration flue gas containing nitrogen, ammonia, acid gases and water vapor.
The method for removing ammonia from flue gas according to claim 2, wherein the temperature of the target space is in the range of 900°C to 1150°C, the amino reducing agent is urea, and the gas flowing through the target space The step of spraying the amino reducing agent on the flue gas to be treated to obtain the denitration flue gas containing ammonia gas and acid gas also includes:

Spraying the urea to the flue gas to be treated flowing through the target space, through the reaction of the urea with the nitrogen oxides in the flue gas to be treated, a denitrification system containing nitrogen, carbon dioxide, ammonia, acid gas and water vapor is obtained. smoke.
The flue gas ammonia removal method according to claim 1, wherein the denitrification flue gas is washed with water to obtain the denitrification water-washed flue gas, and the denitrification water-washed flue gas is diverted to the deacidification tower. In the deacidification tower, the acid gas in the denitrification flue gas is deacidified, and the step of obtaining the deacidified flue gas containing solid dust and the ammonia gas comprises:

The denitrification flue gas washed with water is diverted to a deacidification tower, and the denitrification flue gas is deacidified in the deacidification tower to obtain deacidification flue gas containing solid dust and the ammonia gas.
The flue gas ammonia removal method according to claim 1, wherein the denitrification flue gas is diverted to the deacidification tower, and the acid gas in the denitrification flue gas is processed in the deacidification tower. Deacidification treatment, the step of obtaining the deacidification flue gas containing solid dust and the ammonia gas comprises:

The denitration flue gas is diverted to the deacidification tower, and the deacidification agent is sprayed on the denitrification flue gas in the deacidification tower through the feeder in the deacidification tower to obtain solid dust and the Ammonia deacidification flue gas.
The flue gas ammonia removal method as claimed in claim 6, wherein, when the deacidification tower is a dry deacidification tower, the deacidification agent is sodium bicarbonate powder and/or slaked lime;

When the deacidification tower is a semi-dry deacidification tower, the deacidification agent is lime slurry.
The method for removing ammonia from flue gas according to claim 1, wherein the deacidification flue gas is diverted to the bag filter, and the solid dust in the deacidification flue gas is removed by the bag filter Carry out dedusting treatment, obtain the step that contains the dedusting flue gas of described ammonia and comprise:

Draining the deacidified flue gas to the settling space in the bag filter, and filtering coarse dust particles to obtain deacidified flue gas containing fine dust particles;

The deacidified flue gas containing fine dust particles is diverted through the filter bag in the bag filter to obtain dedusted flue gas containing the ammonia gas.
The method for removing ammonia from flue gas according to claim 1, wherein, the described dedusting flue gas is diverted into the deamination reactor, and the dedusting flue gas in the deamination reactor is Ammonia is deammonized, and the steps to obtain exhaustable flue gas include:

The dedusting flue gas is diverted into the deamination reactor, and the ammonia washing liquid is sprayed on the dust removal flue gas to obtain exhaustable flue gas, wherein the ammonia washing liquid includes one of heavy metal catalysts, activated carbon and acidic substances or more.
The method for removing ammonia from flue gas according to claim 9, wherein the deamination reactor is a deamination reactor in the form of a fixed bed or a deamination reactor in the form of a fluidized bed.