CN102029106A - Calcium-based CO2 absorption furnace - Google Patents

Abstract

The invention discloses a calcium-based _CO2 absorption furnace, which is used in the technical field of carbon dioxide recovery of coal-fired boilers. It is characterized in that it includes an absorption reaction furnace body, one side of the absorption reaction furnace body is installed with a limestone feed port and a burner, the other side is oppositely equipped with a flue gas input port, and the discharge port is installed at the bottom of the furnace body , the cyclone separator is installed on one side of the furnace body and communicated with the absorption reaction furnace. The top of the cyclone separator is provided with a flue gas outlet, and the bottom of the cyclone separator is provided with a discharge port and a vent pipe. The vent pipe is connected to the absorption reaction furnace. The furnace body of the reaction furnace is connected. The invention has the characteristics of good reaction effect, simple structure, good economy and environmental protection.

Description

Calcium-based CO2 absorption furnace

Technical field:

The invention relates to a calcium-based _CO2 absorption furnace, which is used in the occasion of absorbing carbon dioxide emission by a coal-fired boiler.

Background technique:

Global warming is mainly caused by the aggravation of the earth's greenhouse effect caused by the massive emission of CO2 _- based greenhouse gases. Controlling and reducing _CO2 emissions plays an important role in solving the impact of atmospheric greenhouse effect and global warming . _China is a major CO ₂ emitter, accounting for about 1/5 of the world's total CO ₂ emissions, most of which are produced by coal combustion. For a long period of time in the future, my country's coal-based energy structure will not change, and coal consumption will continue to grow. In fossil fuel-based energy production, _CO2 emissions account for more than 70% of the total _CO2 emissions caused by various human activities, which is the largest single-point fixed emission of _CO2 . To control and reduce coal burning The emission of _CO2 from production plays a significant role in addressing the atmospheric greenhouse effect and global warming. Therefore, it is very necessary to separate CO ₂ from the tail gas of coal-fired boilers, and the technology of separating and recovering CO ₂ from combustion exhaust gas becomes very important.

Based on this, the applicant has made the present invention.

Invention content:

In view of the technical problems to be solved above, the main purpose of the present invention is to provide a calcium-based _CO2 absorption furnace with reasonable structural design, wide application range, low energy consumption and good environmental protection.

The technical scheme adopted by the present invention is as follows, a calcium-based _CO2 absorption furnace is characterized in that: it includes an absorption reaction furnace body, one side of the absorption reaction furnace body is equipped with a limestone feed port and a burner, and the other side faces A flue gas input port is installed, and the discharge port is installed at the bottom of the furnace body. The cyclone separator is installed on one side of the furnace body and communicated with the absorption reaction furnace. The top of the cyclone separator is provided with a flue gas outlet. The cyclone separator The bottom of the furnace is provided with a discharge port and a vent pipe, and the vent pipe is connected with the body of the absorption reaction furnace.

Preferably: the furnace body of the absorption reaction furnace is wrapped with asbestos, the furnace body of the absorption reaction furnace adopts a circular loading surface, and the flue gas input port and the limestone feed port are input from the tangent part of the furnace body.

The working principle of the present invention is as follows: CaO absorbs low-concentration CO ₂ in the mixed flue gas from the boiler in the absorption reaction furnace to generate CaCO ₃ . The gas-solid mixture is separated into pure CaCO ₃ in the cyclone separator, which flows out from the lower part of the cyclone separator, and the unreacted mixture returns to the absorption reactor, and the remaining gas is vented from the upper outlet. The temperature required to generate CaCO ₃ is about 650 degrees. The device provides heat; CaO is input from the raw material port, and the mixed flue gas from the boiler is input from the flue gas input port; a working cycle is completed.

The beneficial effects of the present invention are as follows:

1. The present invention uses calcium-based absorbent CaO to absorb low-concentration CO ₂ in the mixed flue gas from the boiler in the absorption reaction furnace to generate CaCO ₃ , which effectively reduces CO ₂ emissions and has good economic and environmental benefits.

2. In the calcium-based _CO2 absorption furnace of the present invention, flue gas inlets and limestone feed ports are used to input tangentially from the furnace body and spray them in opposite directions to form a swirling airflow so that the reaction can be fully carried out.

The present invention will be further described in detail below in conjunction with accompanying drawing 1 and specific embodiments, and the following embodiments are explanations of the present invention but the present invention is not limited to the following embodiments.

Description of drawings:

Fig. 1 is calcium base _CO of the present invention The structural representation of absorption furnace;

Figure 2 is a cross-sectional view of the calcium-based _CO2 absorption furnace of the present invention.

Detailed ways:

As shown in Fig. 1 and Fig. 2, the calcium-based _CO2 absorption furnace of the present invention comprises an absorption reaction furnace furnace body 1, and one side of the absorption reaction furnace furnace body 1 is equipped with a limestone feed port 3 and a burner 4, and the other The flue gas input port 5 is installed on the opposite side, the discharge port 6 is installed at the bottom position of the furnace body 1, the cyclone separator 2 is installed on one side of the furnace body 1 and communicates with the absorption reaction furnace, and the top of the cyclone separator 2 is installed There is a flue gas outlet 7, the bottom of the cyclone separator 2 is provided with a discharge port 8 and a vent pipe 9, the discharge port 8 is used to discharge the separated pure CaCO ₃ , the vent pipe 9 is connected with the absorption reaction furnace body 1, It is used to send the unreacted raw materials into the furnace body 1 to continue the reaction.

The working principle of the present invention is as follows: the mixed flue gas that comes out from coal-fired boiler enters in the absorption reaction furnace furnace body 1 from flue gas input port 5, on the other hand, calcium-based absorbent CaO is input from feed port 3, burner 4 is a mixture of pulverized coal and air, which is ignited and burned to generate heat, so that the temperature of the absorption reaction furnace body 1 is maintained at about 650 degrees, and low-concentration CO ₂ is absorbed in the absorption reaction furnace 1 to generate CaCO ₃ .

The reaction formula is: CaO+CO ₂ →CaCO ₃ +178Kj/mol.

On the other hand, the gas-solid mixture from the absorption reaction furnace 1 enters the cyclone separator 2, and the pure _CaCO3 is separated through the cyclone separator 2, and the pure _CaCO3 separated is discharged from the discharge port 8 at the bottom of the cyclone separator 2 The unreacted mixture is returned to the absorption reaction furnace 1 through the vent pipe 9 to continue the reaction, and the residual gas is emptied from the flue gas outlet 7 on the upper part of the cyclone separator 2. In the absorption reaction furnace body 1, the scrapped CaO and residue Release from the discharge port 6 at the bottom of the body of furnace 1 .

In the present invention, the body 1 of the absorption reaction furnace is wrapped with heat-insulating materials such as asbestos to preserve heat. The absorption reaction furnace 1 adopts a circular loading surface, and the flue gas inlet 5 and the limestone inlet 3 are input from the tangential part of the furnace body. The mouth enters from the middle.

Claims (2)

1. A calcium-based _CO2 absorption furnace is characterized in that: it comprises an absorption reaction furnace body of furnace, a side of the absorption reaction furnace body of furnace is equipped with a limestone feed inlet and a burner, and the other side is oppositely equipped with a flue gas inlet , the discharge port is installed at the bottom of the furnace body, the cyclone separator is installed on one side of the furnace body and communicated with the absorption reaction furnace, the top of the cyclone separator is provided with a flue gas outlet, and the bottom of the cyclone separator is provided with a discharge mouth and vent pipe, and the vent pipe is connected with the furnace body of the absorption reaction furnace. 2. A kind of calcium-based _CO2 absorption furnace according to claim 1, it is characterized in that: absorption reaction furnace furnace body adopts asbestos package, absorption reaction furnace furnace body adopts circular loading surface, flue gas input port, limestone feed The mouth is input from the tangent of the furnace body.

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