Boiler high-temperature ammonia injection denitration device

Abstract

The utility model relates to the technical field of denitration ammonia, specifically relates to a boiler high temperature ammonia injection denitration device, including flue and ammonia injection subassembly, and ammonia injection subassembly includes catalyst supplementary component, ammonia injection grid, communicating pipe, mixing component, water inlet pipe, first control valve, second control valve, evaporimeter, liquid ammonia tank and concentration monitor, install ammonia injection grid in the inside use of flue, ammonia is transported to evaporimeter through liquid ammonia tank, evaporate liquid ammonia through evaporimeter, then enter into mixed box and mix with air, concentration monitor detects the first control valve to open and its to ammonia injection grid is carried out to spray after optimum concentration is monitored, catalyst supplementary component is used for the catalyst needed during reaction, when needing cleaning device, close first control valve, open second control valve, inject pressurized water through water inlet pipe, and the impurities in communicating pipe and ammonia injection grid are sprayed outward.

Description

Technical Field

[0001] This utility model relates to the field of ammonia denitrification technology, and in particular to a boiler high-temperature ammonia injection denitrification device. Background Technology

[0002] One of the major problems in air pollution is nitrogen oxide (NOx) pollution. Research and development of prevention and control technologies have begun. Boilers contain a large amount of nitrogen oxides in their flue gas during coal burning, thus requiring denitrification treatment.

[0003] A high-temperature ammonia injection denitrification device for coal-fired boilers includes several reducing agent spray guns evenly installed between the burnout air nozzle area and the main burner area of ​​the coal-fired boiler. Each reducing agent spray gun has a pressure atomizing nozzle at its insertion end and a reducing agent interface located outside the coal-fired boiler at its other end. All reducing agent spray gun interfaces are connected to a dilution water pipeline and a reducing agent supply pipeline via reducing agent pipelines. A dilution water storage tank and a dilution water pump are sequentially installed at the input end of the dilution water pipeline, and a reducing agent storage tank and a feed pump are sequentially installed in the reducing agent supply pipeline. By installing reducing agent spray guns in the area between the burnout air nozzle area and the main burner area, the ammonia reducing agent is evenly injected into a region with a flue gas temperature of approximately 1300-1500℃. This region has extremely low oxygen content in the flue gas, making it particularly suitable for high-temperature ammonia injection denitrification technology. Multiple spray guns are arranged around the furnace perimeter, with each spray gun responsible only for mixing with the flue gas in its surrounding area, improving the mixing effect between the injected reducing agent and the flue gas. However, during long-term use, the ammonia injection port of the above-mentioned device is prone to blockage by particulate impurities in the flue gas, resulting in uneven ammonia injection and thus requiring more liquid ammonia, wasting resources. Utility Model Content

[0004] The purpose of this invention is to provide a boiler high-temperature ammonia injection denitrification device, which aims to solve the problem that the ammonia injection port of the existing device is easily blocked by particulate impurities in the flue gas during long-term use, resulting in uneven ammonia injection, which in turn requires more liquid ammonia and wastes resources.

[0005] To achieve the above objectives, this utility model provides a boiler high-temperature ammonia injection denitrification device, including a flue and an ammonia injection assembly. The ammonia injection assembly includes a catalyst replenishment component, an ammonia injection grid, a connecting pipe, a mixing component, a water inlet pipe, a first control valve, a second control valve, an evaporator, a liquid ammonia tank, and a concentration monitor. The catalyst replenishment component is installed inside the flue. The ammonia injection grid is fixedly connected to the flue and located on top of the catalyst replenishment component. The connecting pipe is connected to the ammonia injection grid and located on one side of the ammonia injection grid. The mixing component is connected to the connecting pipe and located on one side of the connecting pipe. The first control valve is installed on the connecting pipe. The water inlet pipe is connected to the connecting pipe and located outside the connecting pipe. The evaporator is connected to the mixing component and located on one side of the mixing component. The liquid ammonia tank is connected to the evaporator and located on one side of the evaporator. The concentration monitor is installed on the mixing component. The second control valve is installed on the water inlet pipe.

[0006] The mixing component includes a solenoid valve, a mixing chamber, and an air pump. The mixing chamber is connected to the connecting pipe and the evaporator, and is located between the evaporator and the mixing chamber. The air pump is connected to the mixing chamber and is located on one side of the mixing chamber. The solenoid valve is mounted on the connecting pipe, and the concentration monitor is mounted on the mixing chamber.

[0007] The catalyst replenishment component includes a feed pipe and a catalyst plate. The feed pipe is connected to the flue and is located on one side of the flue. The catalyst plate is fixedly connected to the flue and is located on the inner side of the flue.

[0008] The ammonia injection assembly also includes a third control valve and a flow monitor. The third control valve is located at the connection between the liquid ammonia tank and the evaporator, and the flow monitor is installed on one side of the third control valve.

[0009] The ammonia injection assembly further includes a support frame and a vortex mixer. The support frame is fixedly connected to the flue and located inside the flue. The vortex mixer is fixedly connected to the support frame and located at the bottom of the ammonia injection grid.

[0010] This utility model discloses a high-temperature ammonia injection denitrification device for boilers. The ammonia injection grid is installed inside the flue. Ammonia is supplied to the evaporator through a liquid ammonia tank, evaporated in the evaporator, and then mixed with air in a mixing tank. Once the optimal concentration is detected by the concentration monitor, the first control valve opens to spray the ammonia through the injection grid. A catalyst replenishment component is used to replenish the catalyst needed for the reaction. When cleaning is required, the first control valve is closed, the second control valve is opened, and pressurized water is injected through the inlet pipe to spray impurities from the connecting pipe and the injection grid outwards. This solves the problem in existing devices where the ammonia injection port is easily clogged by particulate impurities in the flue gas during long-term use, leading to uneven ammonia injection and thus requiring more liquid ammonia, wasting resources. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a structural diagram of a boiler high-temperature ammonia injection denitrification device according to this utility model.

[0013] Figure 2 This is a cross-sectional schematic diagram of a boiler high-temperature ammonia injection denitrification device according to this utility model.

[0014] 101-Flue, 102-Ammonia injection assembly, 103-Catalyst replenishment component, 104-Ammonia injection grid, 105-Connecting pipe, 106-Mixing component, 107-Water inlet pipe, 108-First control valve, 109-Second control valve, 110-Evaporator, 111-Liquid ammonia tank, 112-Concentration monitor, 113-Solenoid valve, 114-Mixing box, 115-Air pump, 116-Feed pipe, 117-Catalyst plate, 118-Third control valve, 119-Flow monitor, 120-Support frame, 121-Vortex mixer. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0016] Please see Figures 1-2 , Figure 1 This is a structural diagram of a boiler high-temperature ammonia injection denitrification device according to this utility model. Figure 2 This is a cross-sectional schematic diagram of a boiler high-temperature ammonia injection denitrification device according to this utility model.

[0017] This utility model provides a high-temperature ammonia injection denitrification device for boilers, comprising a flue 101 and an ammonia injection assembly 102. The ammonia injection assembly 102 includes a catalyst replenishment component 103, an ammonia injection grid 104, a connecting pipe 105, a mixing component 106, a water inlet pipe 107, a first control valve 108, a second control valve 109, an evaporator 110, a liquid ammonia tank 111, a concentration monitor 112, a solenoid valve 113, a mixing box 114, an air pump 115, a feed pipe 116, a catalytic plate 117, a third control valve 118, a flow monitor 119, a support frame 120, and a vortex mixer 121. This solution addresses the problem in existing devices where the ammonia injection port is easily clogged by particulate impurities in the flue gas during long-term use, leading to uneven ammonia injection and thus requiring more liquid ammonia, resulting in resource waste.

[0018] In this embodiment, the catalyst replenishment component 103 is installed inside the flue 101, the ammonia injection grille 104 is fixedly connected to the flue 101 and located on top of the catalyst replenishment component 103, the connecting pipe 105 is connected to the ammonia injection grille 104 and located on one side of the ammonia injection grille 104, the mixing component 106 is connected to the connecting pipe 105 and located on one side of the connecting pipe 105, the first control valve 108 is disposed on the connecting pipe 105, the water inlet pipe 107 is connected to the connecting pipe 105 and located outside the connecting pipe 105, the evaporator 110 is connected to the mixing component 106 and located on one side of the mixing component 106, the liquid ammonia tank 111 is connected to the evaporator 110 and located on one side of the evaporator 110, the concentration monitor 112 is disposed on the mixing component 106, and the second control valve 108 is disposed on the mixing component 106. A control valve 109 is installed on the water inlet pipe 107, and the ammonia injection grille 104 is installed inside the flue 101. Ammonia is supplied to the evaporator 110 through the liquid ammonia tank 111. The liquid ammonia is evaporated by the evaporator 110 and then introduced into the mixing box 114 to mix with air. After the concentration monitor 112 detects the optimal concentration, the first control valve 108 is opened to spray the ammonia into the injection grille 104. The catalyst replenishment component 103 is used to replenish the catalyst required during the reaction. When the device needs to be cleaned, the first control valve 108 is closed and the second control valve 109 is opened. Pressurized water is injected through the water inlet pipe 107 to spray out the impurities in the connecting pipe 105 and the ammonia injection grille 104. This solves the problem that the ammonia injection port of the existing device is easily blocked by particulate impurities in the flue gas during long-term use, resulting in uneven ammonia injection and thus requiring more liquid ammonia and wasting resources.

[0019] The mixing component 106 includes a solenoid valve 113, a mixing chamber 114, and an air pump 115. The mixing chamber 114 is connected to the connecting pipe 105 and the evaporator 110, and is located between the evaporator 110 and the connecting pipe 105. The air pump 115 is connected to the mixing chamber 114 and is located on one side of the mixing chamber 114. The solenoid valve 113 is installed on the connecting pipe 105. The concentration monitor 112 is installed on the mixing chamber 114. The evaporator 110 evaporates liquid ammonia and then introduces it into the mixing chamber 114. At the same time, the air pump 115 introduces air into the mixing chamber 114, mixing the vaporized liquid ammonia and air before discharging it towards the ammonia spray grille 104. The concentration monitor 112 is used to monitor the concentration ratio of the mixed air to ammonia to ensure that it is used within the optimal concentration range, thereby improving energy efficiency and saving resources.

[0020] Secondly, the catalyst replenishment component 103 includes a feed pipe 116 and a catalyst plate 117. The feed pipe 116 is connected to the flue 101 and is located on one side of the flue 101. The catalyst plate 117 is fixedly connected to the flue 101 and is located inside the flue 101. The feed pipe 116 is used to introduce the catalyst, and the introduced catalyst is attached to the catalyst plate 117. When the flue gas passes through the catalyst plate 117, the flue gas and the catalyst are mixed, which facilitates the subsequent reduction reaction and accelerates the reaction rate.

[0021] Furthermore, the ammonia injection assembly 102 also includes a third control valve 118 and a flow monitor 119. The third control valve 118 is located at the connection between the liquid ammonia tank 111 and the evaporator 110. The flow monitor 119 is installed on one side of the third control valve 118. The third control valve 118 is used to control the outflow rate of the liquid ammonia tank 111. The flow monitor 119 monitors the flow rate of the discharged liquid ammonia to facilitate the calculation of the optimal dosage during operation.

[0022] Finally, the ammonia injection assembly 102 also includes a support frame 120 and a vortex mixer 121. The support frame 120 is fixedly connected to the flue 101 and located inside the flue 101. The vortex mixer 121 is fixedly connected to the support frame 120 and located at the bottom of the ammonia injection grille 104. The support frame 120 is used to install the vortex mixer 121. The vortex mixer 121 is installed downstream of the ammonia injection grille 104 and consists of multiple staggered guide vanes. The guide vanes are spiral-shaped, generating strong vortex motion when the flue gas passes through, promoting rapid mixing of ammonia and flue gas, and reducing resource waste.

[0023] In the boiler high-temperature ammonia injection denitrification device of this utility model, the ammonia injection grid 104 is installed inside the flue 101. Ammonia is supplied to the evaporator 110 through the liquid ammonia tank 111. The liquid ammonia is evaporated by the evaporator 110 and then introduced into the mixing box 114 to mix with air. After the concentration monitor 112 detects the optimal concentration, the first control valve 108 is opened to spray the ammonia injection grid 104. The catalyst replenishment component 103 is used to replenish the catalyst required during the reaction. When the device needs to be cleaned, the first control valve 108 is closed and the second control valve 109 is opened. Pressurized water is injected through the water inlet pipe 107 to spray out the impurities in the connecting pipe 105 and the ammonia injection grid 104. This solves the problem that the ammonia injection port of the existing device is easily blocked by particulate impurities in the flue gas during long-term use, resulting in uneven ammonia injection and thus requiring more liquid ammonia and wasting resources.

[0024] The above-disclosed embodiments are merely preferred embodiments of the boiler high-temperature ammonia injection denitrification device of this utility model, and should not be construed as limiting the scope of this utility model. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of this utility model still fall within the scope of this utility model.

Claims

1. A boiler high-temperature ammonia injection denitrification device, comprising a flue, characterized in that: It also includes an ammonia injection assembly, which includes a catalyst replenishment component, an ammonia injection grid, a connecting pipe, a mixing component, a water inlet pipe, a first control valve, a second control valve, an evaporator, a liquid ammonia tank, and a concentration monitor; The catalyst replenishment component is installed inside the flue. The ammonia injection grid is fixedly connected to the flue and located on top of the catalyst replenishment component. The connecting pipe is connected to the ammonia injection grid and located on one side of the ammonia injection grid. The mixing component is connected to the connecting pipe and located on one side of the connecting pipe. The first control valve is installed on the connecting pipe. The water inlet pipe is connected to the connecting pipe and located outside the connecting pipe. The evaporator is connected to the mixing component and located on one side of the mixing component. The liquid ammonia tank is connected to the evaporator and located on one side of the evaporator. The concentration monitor is installed on the mixing component. The second control valve is installed on the water inlet pipe.

2. The boiler high-temperature ammonia injection denitrification device as described in claim 1, characterized in that: The mixing component includes a solenoid valve, a mixing chamber, and an air pump. The mixing chamber is connected to the connecting pipe and the evaporator, and is located between the evaporator and the mixing chamber. The air pump is connected to the mixing chamber and is located on one side of the mixing chamber. The solenoid valve is mounted on the connecting pipe, and the concentration monitor is mounted on the mixing chamber.

3. The boiler high-temperature ammonia injection denitrification device as described in claim 1, characterized in that: The catalyst replenishment component includes a feed pipe and a catalyst plate. The feed pipe is connected to the flue and is located on one side of the flue. The catalyst plate is fixedly connected to the flue and is located on the inner side of the flue.

4. The boiler high-temperature ammonia injection denitrification device as described in claim 1, characterized in that: The ammonia injection assembly also includes a third control valve and a flow monitor. The third control valve is located at the connection between the liquid ammonia tank and the evaporator, and the flow monitor is installed on one side of the third control valve.

5. A boiler high-temperature ammonia injection denitrification device as described in claim 1, characterized in that: The ammonia injection assembly also includes a support frame and a vortex mixer. The support frame is fixedly connected to the flue and located inside the flue. The vortex mixer is fixedly connected to the support frame and located at the bottom of the ammonia injection grid.

Images