CN213966532U

CN213966532U - Device based on urea system ammonia is hydrolysised to microwave

Info

Publication number: CN213966532U
Application number: CN202022498343.9U
Authority: CN
Inventors: 马中发; 王露; 张虎晨
Original assignee: Shaanxi Qinglang Wancheng Environmental Protection Technology Co Ltd
Current assignee: Shaanxi Qinglang Wancheng Environmental Protection Technology Co Ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-08-17
Anticipated expiration: 2030-11-03

Abstract

The utility model provides a device based on microwave hydrolysis urea system ammonia relates to urea and decomposes technical field, include: the device comprises a urea microwave pyrolysis furnace, a spray pipe, a hearth and a controller; wherein, the air outlet of the urea microwave pyrolysis furnace is connected with the spray pipe; the other end of the spray pipe is connected with the hearth; the control is connected with the urea microwave pyrolysis furnace and is also connected with the spray pipe. The utility model discloses carry out the pyrolysis to the urea granule based on urea microwave pyrolysis oven, further based on furnace secondary treatment, realized when to the high-efficient ammonia of system of urea, carry out purification treatment to gas, reduced the required energy consumption of urea decomposition in-process, it is energy-concerving and environment-protective.

Description

Device based on urea system ammonia is hydrolysised to microwave

Technical Field

The utility model relates to a urea decomposes technical field, particularly, relates to a device based on urea system ammonia is hydrolysised to microwave.

Background

With the gradual improvement of the national environmental protection standard and the annual increase of the environmental protection supervision, the environmental protection problem of the power industry is concerned widely. At present, the mainstream technology of denitration adopts ammonia gas as a reducing agent, and nitrogen oxide is reduced into nitrogen gas and water which are harmless to the atmosphere under the action of a catalyst, so that the aim of denitration is fulfilled.

The principle of the urea hydrolysis ammonia production technology is that a urea solution with a certain mass concentration is heated by a heat source, urea and water react under certain temperature and pressure conditions to generate gaseous NH3 and CO2, the ammonia production quantity of the urea solution is positively correlated with the concentration of the urea solution, the reaction temperature and the reaction residence time, and the influence of the reaction temperature is the largest. In the prior art, the temperature required by urea decomposition is mainly achieved by adopting an electric heating or steam heating mode, so that the aim of urea decomposition is fulfilled.

However, the method for decomposing urea by adopting electric heating or steam heating in the prior art has the problems that the temperature required by urea decomposition is high, and the energy consumption in the decomposition process is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to adopt the not enough of electrical heating or steam heating decomposition urea among the above-mentioned prior art, provide a device based on urea system ammonia is hydrolysised to the microwave to it is high to solve among the prior art the required temperature of urea decomposition, leads to the big problem of decomposition process energy consumption.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

the embodiment of the utility model provides a device based on ammonia is made to microwave hydrolysis urea, include: the device comprises a urea microwave pyrolysis furnace, a spray pipe, a hearth and a controller;

wherein, the gas outlet of the urea microwave pyrolysis furnace is connected with the spray pipe; the other end of the spray pipe is connected with the hearth; the control is connected with the urea microwave pyrolysis furnace and is also connected with the spray pipe.

Optionally, the urea microwave pyrolysis furnace comprises an air inlet and an air outlet; a fan is arranged at the air inlet; the fan is connected with the controller.

Optionally, the spray pipe is a double-layer pipeline; wherein, the double-layer pipeline is divided into an inner layer pipeline and an outer layer pipeline.

Optionally, the outer layer pipeline is introduced with water vapor; the inner layer pipeline is connected with an air outlet of the urea microwave pyrolysis furnace.

Optionally, the water vapor enters the outer layer pipeline through a control valve, and the outer layer pipeline is connected with the controller.

Optionally, the device is further provided with a sensor; the sensor comprises a temperature sensor, an air volume sensor and a concentration sensor.

The utility model has the advantages that: a device for preparing ammonia gas based on microwave hydrolysis of urea comprises: the device comprises a urea microwave pyrolysis furnace, a spray pipe, a hearth and a controller; wherein, the gas outlet of the urea microwave pyrolysis furnace is connected with the spray pipe; the other end of the spray pipe is connected with the hearth; the control is connected with the urea microwave pyrolysis furnace and is also connected with the spray pipe. That is to say, the utility model discloses carry out the pyrolysis to the urea granule based on urea microwave pyrolysis oven, further based on furnace secondary treatment, realized when to the high-efficient ammonia of system of urea, carry out purification treatment to gas, reduced the required energy consumption of urea decomposition in-process, energy-concerving and environment-protective.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of a microwave urea hydrolysis device according to an embodiment of the present invention.

Icon: 1-urea microwave pyrolysis furnace, 2-spray pipe, 3-hearth and 4-controller.

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. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 is a schematic view of a microwave urea hydrolysis device, and the microwave urea hydrolysis device provided by the embodiment of the present invention is described in detail with reference to fig. 1.

Fig. 1 is a schematic view of a microwave urea hydrolysis device provided by an embodiment of the present invention, as shown in fig. 1, the microwave urea hydrolysis device includes: urea microwave pyrolysis oven 1, spray tube 2, furnace 3 and controller 4.

In the embodiment of the utility model, urea microwave pyrolysis oven 1 contains urea granule. Urea, also known as carbamide (carbomide), is an organic compound consisting of carbon, nitrogen, oxygen, and hydrogen, which is a white crystal. Urea reacts with water at elevated temperatures to form NH₃And CO₂We call the hydrolysis of urea. CO (NH2) at temperatures above 60 DEG C₂The hydrolysis is started, the hydrolysis speed is accelerated when the temperature reaches 80 ℃, the hydrolysis speed is increased sharply when the temperature is higher than 145 ℃, and the hydrolysis is more violent in a boiling urea aqueous solution.

Optionally, the urea microwave pyrolysis furnace 1 comprises an air inlet and an air outlet; a fan is arranged at the air inlet; the fan is connected with the controller.

In the embodiment of the utility model, the air intake and the air outlet of urea microwave pyrolysis oven 1 all set up the metal mesh. The inlet and outlet of the urea microwave pyrolysis furnace 1 are provided with metal nets, and the aperture of each metal net is smaller than or equal to 3 mm. Here, in order to prevent the microwave leakage. When the human body is very close to the microwave radiation source for a long time, the phenomena of dizziness, sleep disorder, hypomnesis, bradycardia, blood pressure reduction and the like are caused by excessive radiation energy. When the microwave leakage reaches 1mw/cm2, the eyes suddenly feel dazzled, the vision is degraded, and even cataract is caused. In order to ensure the health of users, metal nets are arranged at the inlet and the outlet of the reaction cavity, and the corners can generate microwave discharge under the action of microwaves, so that dangerous accidents are easy to happen. The metal mesh can block microwave leakage, reduce the damage of microwave to human body and improve the safety of the system.

The embodiment of the utility model provides an in, urea microwave pyrolysis oven 1 comprises high temperature resistant metal cavity, the even distribution microwave source of metal cavity's lateral wall.

Specifically, under the action of microwaves, urea is pyrolyzed for the first time: CO (NH2)2 → NH3+ HNCO), and then blown into the urea pyrolysis device as hot air. The secondary air of a boiler can be used, the boiling point of the urea pyrolysis product HNCO is 23.6 ℃, the air temperature is controlled to be 60-80 ℃, and the purified tail gas is adopted. The primary pyrolysis products (NH3 and HNCO) were blown out of the gas outlet.

The embodiment of the utility model provides an in, in order to make urea microwave pyrolysis oven 1 thermally equivalent under the effect of microwave source, set up a plurality of microwave sources at 1 outer wall of urea microwave pyrolysis oven. It should be noted that under the action of the external alternating electromagnetic field, the polar molecules in the material are polarized and alternate orientation is achieved along with the change of the polarity of the external alternating electromagnetic field, so that the electromagnetic energy is converted into heat energy due to frequent friction loss among numerous polar molecules.

Here, the microwave source includes a plurality of microwave sources distributed in an array on the top of the reaction chamber. The microwave is an electric wave having a frequency of 300 mhz to 300 ghz, and water molecules in the heated medium material are polar molecules. Under the action of a rapidly changing high-frequency point magnetic field, the polarity orientation of the magnetic field changes along with the change of an external electric field. The effect of mutual friction motion of molecules is caused, at the moment, the field energy of the microwave field is converted into heat energy in the medium, so that the temperature of the material is raised, and a series of physical and chemical processes such as thermalization, puffing and the like are generated to achieve the aim of microwave heating.

The microwave heating has the following advantages: the heating time is short; the heat energy utilization rate is high, and energy is saved; heating uniformly; the microwave source is easy to control, and the microwave can also induce the catalytic reaction.

The microwave is generated by a microwave source, which is mainly composed of a high-power magnetron. The magnetron is a device which completes energy conversion by utilizing the movement of electrons in vacuum and can generate high-power microwave energy, for example, a 4250MHz magnetic wave tube can obtain 5MHz, and a 4250MHz klystron can obtain 30MHz, so that the microwave technology can be applied to the technical field of wastewater treatment.

Optionally, the spray pipe 2 is a double-layer pipeline; wherein, the double-layer pipeline is divided into an inner layer pipeline and an outer layer pipeline. Wherein, the outer layer pipeline is introduced with water vapor; the inner layer pipeline is connected with the air outlet of the urea microwave pyrolysis furnace 1. The water vapor enters the outer layer pipeline through the control valve, and the outer layer pipeline is connected with the controller 4.

The embodiment of the utility model provides an in, the spray tube is double-deck pipeline, and vapor is stored in the box, and in the effect of control valve, the pump is with the water suction in the box in outer pipeline. It should be noted that the gas discharged from the gas outlet of the urea microwave pyrolysis furnace 1 is high-temperature gas, and the high-temperature gas enters the spray pipe through the inner-layer pipeline to heat and vaporize the water vapor on the outer layer. Illustratively, the gas blown out from the gas outlet of the urea microwave pyrolysis furnace 1 passes through the spray pipe. The spray pipe is a double-layer pipeline, urea pyrolysis diluent gas is arranged inside the spray pipe, and water vapor is arranged on the outer layer of the spray pipe.

Wherein, the air outlet of the urea microwave pyrolysis furnace 1 is connected with the spray pipe 2; the other end of the spray pipe 2 is connected with the hearth 3; the controller 4 is connected with the urea microwave pyrolysis furnace 1, and the controller 4 is also connected with the spray pipe 2.

In the embodiment of the utility model provides an in, will add the boiler furnace through the gas of spray tube 3. Selecting a hearth temperature to be controlled within the range of 850-950 ℃, and further pyrolyzing urea, wherein the pyrolysis equation is as follows: HNCO + H2O → NH3+ CO 2. That is, the final products of urea pyrolysis are carbon dioxide and ammonia.

Optionally, the device is further provided with a sensor; the sensor comprises a temperature sensor, an air quantity sensor and a concentration sensor.

The embodiment of the utility model provides an in, set up temperature sensor and air sensor in the air inlet department of device, furnace's air outlet department sets up consistency transmitter. The temperature sensor is used for detecting the temperature and air volume information of hot air at the air inlet; the concentration sensor is used for detecting the concentration information of the finally generated ammonia gas, meanwhile, the sensors upload the acquired information to the controller 4, and the controller controls the working state of each component.

The embodiment discloses a device based on ammonia is prepared to microwave hydrolysis urea includes: the device comprises a urea microwave pyrolysis furnace 1, a spray pipe 2, a hearth 3 and a controller 4; wherein, the air outlet of the urea microwave pyrolysis furnace 1 is connected with the spray pipe 2; the other end of the spray pipe 2 is connected with the hearth 3; the controller 4 is connected with the urea microwave pyrolysis furnace 1, and the controller 4 is also connected with the spray pipe 2. That is to say, the utility model discloses carry out the pyrolysis to the urea granule based on urea microwave pyrolysis oven, further based on furnace secondary treatment, realized when to the high-efficient ammonia of system of urea, carry out purification treatment to gas, reduced the required energy consumption of urea decomposition in-process, energy-concerving and environment-protective.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device based on ammonia is prepared to microwave hydrolysis urea, its characterized in that includes: the device comprises a urea microwave pyrolysis furnace, a spray pipe, a hearth and a controller;

wherein, the gas outlet of the urea microwave pyrolysis furnace is connected with the spray pipe; the other end of the spray pipe is connected with the hearth; the controller is connected with the urea microwave pyrolysis furnace, and the controller is also connected with the spray pipe.

2. The apparatus for producing ammonia gas based on microwave hydrolysis of urea according to claim 1, wherein the urea microwave pyrolysis oven comprises a gas inlet and a gas outlet; a fan is arranged at the air inlet; the fan is connected with the controller.

3. The device for producing ammonia gas through urea hydrolysis by microwaves according to claim 1, wherein the spray pipe is a double-layer pipe; wherein, the double-layer pipeline is divided into an inner layer pipeline and an outer layer pipeline.

4. The device for producing ammonia through microwave hydrolysis of urea according to claim 3, wherein the outer pipe is filled with water vapor; the inner layer pipeline is connected with an air outlet of the urea microwave pyrolysis furnace.

5. The apparatus for producing ammonia through microwave hydrolysis of urea according to claim 4, wherein the water vapor enters the outer pipe through a control valve, and the outer pipe is connected with the controller.

6. The device for producing ammonia gas based on microwave hydrolysis of urea according to claim 1, wherein the device is further provided with a sensor; the sensor comprises a temperature sensor, an air volume sensor and a concentration sensor.