CN101099918A

CN101099918A - Absorption tower flue gas direct discharge process

Info

Publication number: CN101099918A
Application number: CNA200710078583XA
Authority: CN
Inventors: 杜云贵; 洪燕; 刘艺; 李锐; 刘清才; 罗晓渝; 廖帆; 余宇; 彭期耀; 王强; 黄锐; 刘爽
Original assignee: Chongqing University; CPI Yuanda Environmental Protection Engineering Co Ltd
Current assignee: Chongqing University; CPI Yuanda Environmental Protection Engineering Co Ltd
Priority date: 2007-06-06
Filing date: 2007-06-06
Publication date: 2008-01-09
Anticipated expiration: 2027-06-06
Also published as: CN100486673C

Abstract

The invention discloses a flue gas direct discharge process of an absorption tower, which is composed of the following steps: step 1, an absorption tower (2) is installed, the upper end of the absorption tower (2) overlaps a chimney (3), and communicates with the inner cavity of the absorption tower (2) , and form a whole; step 2, making limestone slurry; step 3, absorbing SO ₂ flue gas; the desulfurization rate of the whole system reaches 96%. The invention saves the chimney, the flue gas heat exchanger, the flue and the interface originally used to connect the chimney and the absorption tower, reduces the system resistance of the flue gas, greatly reduces the initial investment, saves construction and maintenance costs, and reduces operating costs .

Description

Adsorption tower smoke directly ventilating technology

Technical field

The invention belongs to the flue gas desulfurization field, specifically, relate to a kind of fume emission technology.

Background technology

Along with the strictness day by day of China's Air Pollution Prevention Law rule, the flue gas in power station boiler desulfurization is imperative, and flue gas desulfurization technique is promotion and application promptly.Present domestic operation and in the desulfurizer of building, wet desulphurization accounts for more than 90%, and the flue gas after the wet desulphurization is mostly by smoke stack emission, chimney is the discharging modes of a kind of high investment, high flow rate, maximum discharge, difficult circulation, poor efficiency, therefore, in wet desulfurization system, select the fume emission mode to take all factors into consideration from aspects such as environmental protection, economy and technology.

Flue gas promotes SO in the flue gas by the cooling of flue gas heat exchange device after the booster fan pressurization ₂Absorption, enter the absorption tower through flue then, chimney and absorption tower split design are come out from the upper end on absorption tower through the clean flue gas after the desulfurization of absorption tower, heat of the corrosion of alleviation low temperature saturated flue gas again through the flue gas heat exchange device, discharge from chimney through flue at last chimney.

Its shortcoming is: floor space is big, and some reconstruction unit can't adopt owing to the space is limited; Because chimney is than higher, it is many to build the required raw material of chimney, and will do corresponding anti-corrosion measure, so the chimney cost is very high.

Summary of the invention

The purpose of this invention is to provide a kind of adsorption tower smoke directly ventilating technology.

The object of the present invention is achieved like this:

Step 1, the absorption tower is set, the overlapping chimney in absorption tower upper end, and communicate with the absorption tower inner chamber, and form an integral body, this chimney top is cylinder, the bottom is cone, and this cone larger diameter end is connected and equal diameters with cylindrical absorbent cat head end, and bottom, described absorption tower is provided with the demist layer for oxidation pond, top, this demist layer below is provided with spraying layer, offers into mouth at the absorption tower sidewall between oxidation pond and spraying layer;

Step 2 is made lime stone slurry, and configuration lime stone slurry concentration is 30～40%, and lime stone slurry pH is alkalescence about 8-10, and the temperature of lime stone slurry is a room temperature, then lime stone slurry is delivered to the oxidation pond on absorption tower;

Step 3, SO ₂The absorption of flue gas, other booster fan and the circulating pump of being provided with on described absorption tower, wherein booster fan is communicated with the mouth that advances on absorption tower by pipeline, circulating pump connects the spraying layer other end by pipeline one end and stretches in the oxidation pond on absorption tower, after being boosted by booster fan, directly advances in the people absorption tower flue gas, slurries in the absorption tower are delivered to tower top spraying layer by circulating pump from the oxidation pond of bottom, absorption tower, slurries atomize through spraying layer, atomization slurry passes through the absorption tower from top to bottom, with advance the flue gas adverse current that mouth comes in from absorption tower bottom and contact concurrent biochemical reaction, flow to the oxidation pond of bottom, absorption tower behind the generation calcium sulfite, flue gas upwards directly enters atmosphere from chimney along the absorption tower after desulfurizing and purifying is removed water smoke.

The adsorption tower smoke directly ventilating technology that the integrated design that the present invention adopts chimney to build the top, absorption tower in forms reduces flue and bend setting, reduces the flue gas system resistance, reduces crushing, reduces the booster fan energy consumption simultaneously, reduces cost of investment and operating cost expense.Build chimney in the absorption tower top, absorption tower body (about 30 meters high) can be used as the part of chimney, directly builds chimney material and cost such as anticorrosion that chimney just can be saved 30 meters height at the top, absorption tower, reduction desulfurization project cost; This technology can be saved traditional flue gas heat exchange device, reduces huge cost of equipment and has also saved operating cost simultaneously; The integrated design of chimney being built in the top, absorption tower can reduce system's floor space, overcome the reality of land used anxiety, particularly especially practical for some old unit reconstruction projects, because all there is the situation of insufficient space in many old units, also brought convenience simultaneously for technological improvement; The desulfuration efficiency of the adsorption tower smoke directly ventilating technology that the integrated design that the present invention adopts chimney to build the top, absorption tower in forms can be up to 96%.

The present invention compared with prior art has following beneficial effect:

1, reduces flue and bend setting, reduce the flue gas system resistance, reduce crushing, reduce the booster fan energy consumption simultaneously, reduce cost of investment and operating cost expense.

2, save the investment of flue gas heat exchange apparatus, and operating cost.

3, need not to establish in addition flue and connect chimney, reduce settings such as flue connector.

4, the required floor space of whole system is little, has saved the chimney expenditure of construction of 30 meters height simultaneously.

5, desulfuration efficiency height, desulfurization degree can reach more than 96%.

Description of drawings

Fig. 1 is a schematic flow sheet of the present invention.

The specific embodiment

One power plant, exhaust gas volumn is 1,150,000 Nm ³/ h; Import SO ₂Content is 980mg/Nm ³The Ca/s ratio is 1.025, and desulfurization degree reaches 96%; The chimney height of building the top, absorption tower in is about 120m.Whole process step is as follows:

Step 1, absorption tower 2 is set, the overlapping chimney 3 in 2 upper ends, absorption tower, and communicate with absorption tower 2 inner chambers, and form an integral body, these chimney 3 tops are cylinder, the bottom is cone, and this cone larger diameter end is connected and equal diameters with cylindrical absorbent tower 2 tops, and 2 bottoms, described absorption tower are that oxidation pond 2b, top are provided with demist layer 2d, this demist layer 2d below is provided with spraying layer 2c, offers into mouth 2a at absorption tower 2 sidewalls that are positioned between oxidation pond 2b and the spraying layer (2c);

Step 2 is made lime stone slurry, and configuration lime stone slurry concentration is 37%, and lime stone slurry pH is alkalescence about 9, and the temperature of lime stone slurry is a room temperature, then lime stone slurry is pumped into the oxidation pond 2b on absorption tower 2;

Step 3, SO ₂The absorption of flue gas, at described absorption tower 2 other booster fan 1 and the circulating pumps 4 of being provided with, wherein booster fan 1 is communicated with the mouth 2a that advances on absorption tower 2 by pipeline, circulating pump 4 connects the spraying layer 2c other end by pipeline one end and stretches in the oxidation pond 2b on absorption tower 2, flue gas directly advances in the people absorption tower 2 after being boosted by booster fan 1, slurries in the absorption tower 2 are delivered to tower top spraying layer 2c by the oxidation pond 2b of circulating pump 42 bottoms from the absorption tower, slurries atomize through spraying layer 2c, atomization slurry is from top to bottom by absorption tower 2, with from the absorption tower 2 bottoms advance the flue gas adverse current that mouth 2a comes in and contact concurrent biochemical reaction, generate the oxidation pond 2b that flows to 2 bottoms, absorption tower behind the calcium sulfite, flue gas 2 upwards directly enters atmosphere from chimney 3 along the absorption tower after desulfurizing and purifying is removed water smoke.The whole system desulfurization degree reaches 96%, and the flue gas system resistance is littler, reduces the booster fan energy consumption simultaneously, reduces cost of investment and operating cost expense.

Claims

1, a kind of absorption tower flue gas direct discharge process is characterized in that, described absorption tower flue gas direct discharge process is carried out as follows:

Step 1, install the absorption tower (2), the upper end of the absorption tower (2) overlaps the chimney (3), and communicates with the inner cavity of the absorption tower (2), and forms a whole, the upper part of the chimney (3) is cylindrical, and the lower part is Cone, the large-diameter end of the cone is connected to the top of the cylindrical absorption tower (2) and has the same diameter. The bottom of the absorption tower (2) is an oxidation pool (2b), and the upper part is provided with a demister layer (2d). A spray layer (2c) is provided below the layer (2d), and a smoke inlet (2a) is provided on the side wall of the absorption tower (2) between the oxidation tank (2b) and the spray layer (2c);

Step 2, make limestone slurry, configure the concentration of limestone slurry to be 30-40%, the pH of limestone slurry is alkaline at about 8-10, the temperature of limestone slurry is room temperature, and then send the limestone slurry to the oxidation pond of the absorption tower (2) (2b);

Step 3, SO The absorption of _flue gas, a booster fan (1) and a circulation pump (4) are set beside the absorption tower (2), wherein the booster fan (1) passes through the inlet of the absorption tower (2) through a pipeline. The smoke port (2a) is connected, and the circulation pump (4) is connected to the spray layer (2c) through one end of the pipeline and the other end extends into the oxidation pool (2b) of the absorption tower (2); the flue gas is boosted by the booster fan (1) After that, it directly enters the absorption tower (2), and the slurry in the absorption tower (2) is sent to the upper spray layer (2c) of the tower from the oxidation tank (2b) at the bottom of the absorption tower (2) by a circulating pump (4). Atomized by the spray layer (2c), the atomized slurry passes through the absorption tower (2) from top to bottom, and countercurrently contacts with the flue gas coming in from the smoke inlet (2a) at the bottom of the absorption tower (2) and undergoes a chemical reaction to form The calcium sulfite flows into the oxidation pond (2b) at the bottom of the absorption tower (2), and the flue gas is desulfurized and purified to remove water mist, and then goes upward along the absorption tower (2) and is directly discharged into the atmosphere from the chimney (3).