Gasification gas integrated coal clean combustion system

Abstract

The utility model relates to the field of clean combustion, in particular to a gasified fuel gas integrated coal clean combustion system which comprises a circulating fluidized bed boiler, a coal conveyor connected with the circulating fluidized bed boiler and used for supplying pulverized coal to a circulating fluidized bed, a header pipe connected with the circulating fluidized bed and a temperature control unit. The main pipe is connected with a sewage pipe communicated with industrial sewage, and the temperature control unit comprises a temperature sensor arranged on a boiler of the circulating fluidized bed and used for detecting the temperature of a combustion area of the circulating fluidized bed. The gasified fuel gas integrated clean coal combustion system is provided with the sewage pipe communicated with the industrial sewage, and the temperature in the circulating fluidized bed boiler is controlled through the temperature control unit in the system, so that the generation of fuel NOx is controlled, the generation of NOx gas is reduced, the environmental pollution is reduced, the sewage is recycled, the energy consumption is saved, and the environment pollution is reduced. And the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to clean combustion technical field especially relates to a gasification gas integration coal clean combustion system. BACKGROUND

[0002] Circulating fluidized bed boiler is a commonly used coal-fired boiler, and the high temperature condition inside the same will lead to the generation of fuel type NOx and raw material type NOx. In the circulating fluidized bed boiler, coal or other fuels are oxidized and combusted under high temperature conditions to produce a large amount of combustion products. In the process of coal combustion, nitrogen will react with oxygen to form nitrogen oxide (NO). These nitrogen oxides will be discharged into the atmosphere with flue gas, thereby causing air pollution.

[0003] In view of the above problems, the present design is based on the rich practical experience and professional knowledge in such product engineering application for many years, and cooperates with the use of theory, actively researches and innovates, in order to create a gasification gas integration coal clean combustion system, so that it has more practicality. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problems in the background art, the utility model adopts the technical scheme of a gasification gas integration coal clean combustion system, which comprises: a circulating fluidized bed boiler, a coal feeder connected with the circulating fluidized bed boiler for supplying coal powder to the circulating fluidized bed, a main pipe connected with the circulating fluidized bed, and a temperature control unit, wherein the main pipe is connected with a sewage pipe for communicating with industrial sewage, and the temperature control unit comprises a temperature sensor arranged in the boiler of the circulating fluidized bed for detecting the temperature of the combustion zone of the circulating fluidized bed.

[0005] Further, the sewage pipe is provided with an atomizing nozzle for atomizing sewage into water vapor.

[0006] Further, the water outlet of the atomizing nozzle faces the main pipe, so that the atomized sewage is mixed with the primary air in the main pipe, and the primary air entrains the sewage into the circulating fluidized bed boiler.

[0007] Further, the main pipe comprises a first straight pipe section, a first flared section, a second straight pipe section, a second flared section and a third straight pipe section connected in sequence, and along the direction of airflow, the radial dimension of the first flared section gradually decreases, and the radial dimension of the second flared section gradually increases.

[0008] Further, the temperature control unit further comprises a solenoid valve arranged on the sewage pipe and a controller for receiving the temperature data of the temperature sensor and determining the opening and closing of the solenoid valve according to the preset temperature value.

[0009] Further, the connection between the sewage tank and the main pipe is located at the second straight pipe section. Further, the connection between the sewage tank and the main pipe is located at the second straight pipe section.

[0010] Further, the preset temperature value is 830℃.

[0011] The gasification gas integrated coal clean combustion system of the utility model has the sewage pipe which communicates with industrial sewage, controls the temperature in the circulating fluidized bed boiler between 800°C and 900°C through the temperature control unit in the system, can guarantee the full combustion of coal, can reduce the generation of NOx, reaches the requirement of environmental protection emission. On the other hand, the CO and H2 generated by the reaction of water vapor and carbon can continue to burn in the hearth of the circulating fluidized bed boiler, saves fuel resources, and improves the utilization efficiency of energy. The utility model circulates and uses the sewage, reduces the pollution of the environment, controls the temperature in the hearth, reduces the emission of waste, and protects the environment. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments in the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0013] Figure 1 It is the schematic diagram of the gasification gas integrated coal clean combustion system in the embodiment of the utility model.

[0014] The figure mark: 1, circulating fluidized bed boiler;2, main pipe;21, first straight pipe section;22, first flared section;23, second straight pipe section;24, second flared section;25, third straight pipe section;3, sewage pipe;4, atomizing nozzle. DETAILED DESCRIPTION

[0015] It should be noted that the following detailed description is all exemplary, and aims at providing further description to the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as that understood by the ordinary skilled in the art to which the present application belongs.

[0016] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form also includes the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the present description, they indicate the presence of the features, steps, operations, devices, components and / or their combinations.

[0017] As Figure 1The shown gasification gas integrated coal clean combustion system comprises: a circulating fluidized bed boiler 1, a coal feeder connected with the circulating fluidized bed boiler for feeding coal powder to the circulating fluidized bed, a main pipe 2 connected with the circulating fluidized bed and a temperature control unit, the main pipe 2 is located below the circulating fluidized bed and connected with the lower part of the circulating fluidized bed.

[0018] The sewage pipe 3 is provided with an atomizing nozzle 4 for atomizing sewage into water vapor. The atomizing nozzle 4 can finely atomize the sewage into tiny droplets, and the water outlet of the atomizing nozzle 4 is directed towards the main pipe 2, so that the atomized sewage droplets are mixed with the primary air in the main pipe 2, and the primary air entrains the sewage into the circulating fluidized bed boiler 1. The atomizing nozzle 4 in the embodiment can be a single-fluid nozzle, and the material can be high-temperature-resistant ceramic or high-temperature alloy. The nozzle aperture is in the range of 50-100 microns, and the nozzle aperture can be adjusted. By adjusting the size of the nozzle aperture, the size of the jet flow can be adjusted. When the temperature control unit detects that the temperature rising speed in the circulating fluidized bed boiler 1 is higher than the highest preset value, the size of the atomizing nozzle aperture can be adjusted to make more atomized sewage enter the furnace of the circulating fluidized bed; when the temperature control unit detects that the temperature rising speed in the circulating fluidized bed boiler 1 returns to normal, the size of the atomizing nozzle aperture can be adjusted back to the preset aperture to achieve fine atomization. The flexible atomizing nozzle 4 of the utility model can ensure the sufficiency of combustion in the boiler and can also cope with different use conditions.

[0019] The main pipe 2 comprises a first straight pipe section 21, a first flared section 22, a second straight pipe section 23, a second flared section 24 and a third straight pipe section 25 connected in sequence. Along the direction of the gas flow, the radial dimension of the first flared section 22 gradually decreases, and the radial dimension of the second flared section 24 gradually increases. The connection between the sewage tank and the main pipe 2 is located at the second straight pipe section 23. The shape of the main pipe 2 is arranged to accelerate the flow rate of the primary air in the first flared section 22, so as to form a negative pressure in the main pipe 2, thereby improving the flow rate of the primary air and improving the conveying efficiency of the primary air.

[0020] The temperature control unit comprises a temperature sensor arranged in the circulating fluidized bed boiler for detecting the temperature of the combustion zone of the circulating fluidized bed, an electromagnetic valve arranged on the sewage pipe 3, and a controller for receiving the temperature data of the temperature sensor and determining the opening and closing of the electromagnetic valve according to a preset temperature value. The controller can be a PLC or a microcontroller. The controller receives the data of the temperature sensor, judges whether the temperature exceeds the preset temperature 830 DEG C, and controls the opening and closing state of the electromagnetic valve to realize the automatic control of the temperature in the boiler. When the temperature in the circulating fluidized bed exceeds 830 DEG C, the controller controls the opening of the electromagnetic valve, and the industrial sewage is atomized by the atomizing nozzle 4 of the sewage pipe 3 and then enters the main pipe 2, and the primary air carries the sewage into the combustion zone of the fluidized bed, at this time, C+O2→CO2, which is an endothermic reaction, and C+H2O→CO+H2, which is an exothermic reaction. The two reactions can control the temperature in the furnace of the circulating fluidized bed to be less than 900 DEG C, so as to control the generation of fuel-type NOx, and the generated ions H can also reduce the raw material type NOx. When the temperature in the circulating fluidized bed is less than 800 DEG C, the controller controls the closing of the electromagnetic valve. When the temperature in the circulating fluidized bed is less than 800 DEG C, the carbon combustion reaction is insufficient, which will lead to incomplete combustion and the increase of the generation of NOx in the combustion products; when the temperature exceeds 900 DEG C, the electromagnetic valve of the sewage pipe 3 is opened, so that the carbon in the boiler reacts with water, the temperature in the boiler is reduced, the reaction rate of oxygen and nitrogen caused by high temperature is avoided, and the generation of nitrogen oxides is also increased. Through the arrangement of the temperature control unit, the temperature of the circulating fluidized bed can be controlled between 800 DEG C and 900 DEG C, the coal can be fully combusted, the generation of NOx can be reduced, and the requirements of environmental protection emission can be met. On the other hand, the CO and H2 generated by the reaction of water vapor and carbon can continue to be combusted in the furnace of the circulating fluidized bed boiler 1, fuel resources are saved, and the utilization efficiency of energy is improved. The present application realizes the recycling of sewage, reduces the pollution of the environment, controls the temperature in the furnace, reduces the waste discharge, and protects the environment.

[0021] It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only used to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A gasification gas integrated coal clean combustion system, characterized by, The utility model relates to a circulating fluidized bed boiler (1), the coal feeder that supplies the pulverized coal to the circulating fluidized bed with the circulating sulfurized bed boiler connection, the main pipe (2) that is connected with the circulating fluidized bed and temperature control unit, the sewage pipe (3) that is connected with the sewage communication of industry on the main pipe (2), the temperature control unit includes the temperature sensor that is located in the boiler of the circulating fluidized bed, to detect the temperature of the combustion zone of circulating fluidized bed. The sewage pipe (3) is provided with atomizing nozzle (4) that atomizes sewage into water vapor.

2. The gasification gas integrated coal clean combustion system according to claim 1, characterized in that, The water outlet of the atomizing nozzle (4) faces the main pipe (2), so that the atomized sewage mixes with the primary air in the main pipe (2) and the primary air entrains the sewage into the circulating fluidized bed boiler (1).

3. The gasification gas integrated coal clean combustion system according to claim 2, characterized by, The main pipe (2) comprises a first straight pipe section (21), a first flared section (22), a second straight pipe section (23), a second flared section (24) and a third straight pipe section (25) connected in sequence, and the radial dimension of the first flared section (22) gradually decreases and the radial dimension of the second flared section (24) gradually increases along the direction of airflow.

4. The gasification gas integrated coal clean combustion system according to claim 1, characterized by, The temperature control unit further comprises a solenoid valve arranged on the sewage pipe (3) and a controller for receiving the temperature data of the temperature sensor and determining the opening and closing of the solenoid valve according to a preset temperature value.

5. The gasification gas integrated coal clean combustion system according to claim 1, characterized in that, The connection between the sewage pipe (3) and the main pipe (2) is located at the second straight pipe section (23).

6. The gasification gas integrated coal clean combustion system according to claim 4, characterized in that, The preset temperature value is 830℃.

7. The gasification gas integrated coal clean combustion system according to claim 5, characterized in that, ​

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