CN103691295A - Horizontal semi-dry process desulfurization device of flue at tail part of boiler - Google Patents

Abstract

The invention discloses a horizontal semi-dry process desulfurization device of a flue at the tail part of a boiler. The horizontal semi-dry process desulfurization device with the structure form is simple in structure, ingenious in design and reasonable in layout. The horizontal semi-dry process desulfurization device can be arranged between an air preheater and a dust remover of the boiler, can carry out humidifying-activating-desulfurizing treatment on flue gas of the boiler, is matched with the traditional desulfurization device to improve the total desulfurization efficiency and can control the temperature of the flue gas entering the dust remover to meet the requirement of the dust remover to the temperature of the flue gas. The horizontal semi-dry process desulfurization device can be used as beneficial supplementation of the traditional desulfurization process, or can be independently used as the desulfurization device of the boiler burning low-sulfur coal. The horizontal semi-dry process desulfurization device disclosed by the invention has the advantages that the desulfurization efficiency is improved under the condition that the calcium-sulfur ratio is slightly increased, the emission standard of sulfur dioxide in the flue gas is met, the scaling of the device is avoided, a new site is not occupied, the flue-gas resistance is not basically increased and the operation cost is lower, so that the horizontal semi-dry process desulfurization device has multiple advantages, is especially suitable for being promoted and applied in the field and has very wide market prospect.

Description

The horizontal semidry process desulfurizer of a kind of boiler back end ductwork

Technical field

The present invention relates to a kind of useless flue gas processing device, particularly the horizontal semidry process desulfurizer of a kind of boiler back end ductwork.

Background technology

In the fume emission process of boiler, need to carry out flue gas desulfurization processing.Present stage flue gas desulfurization generally adopts the desulfurization of calcium method.The topmost technique of calcium method desulfurization is desulfurization after middle burning, claims again flue gas desulfurization (Flue gas desulfurization is called for short FGD).In calcium method desulfur technology, by absorbent and desulfurization product, the dry and wet state in sweetening process can be divided into desulfur technology again wet method, dry method and half-dried (half is wet) method.Wet FGD technology is with the desulfurization and process desulfurization product under wet condition of the solution that contains absorbent or slurries, and this method has that desulphurization reaction speed is fast, equipment simple, desulfuration efficiency advantages of higher, and its desulfuration efficiency can reach more than 95%.But its construction cost is high, and there is seriously corroded, operation and maintenance cost is high and easily cause secondary pollution problems; The desulfurization absorption of dry method FGD technology and product are processed and all under dry state, are carried out, this method have without sewage spent acid discharge, equipment corrosion degree is lighter, flue gas in purification process without significant hypothermal, purify after cigarette temperature high, be beneficial to the advantages such as chimney exhaust diffusion, secondary pollution are few, but exist desulfuration efficiency low, the problems such as reaction speed is slow, equipment is huge, its desulfuration efficiency is generally in 60% left and right; Semidry method FGD technology refers to desulfurizing agent desulfurization under drying regime, regeneration under wet condition (as washing regenerating active carbon flow process), or desulfurization under wet condition, under dry state, processes the flue gas desulfurization technique of desulfurization product (as spray drying process).Particularly desulfurization under wet condition, under dry state, process the semidry method of desulfurization product, with its advantage that existing wet desulphurization reaction speed is fast, desulfuration efficiency is high, have again dry method without sewage spent acid discharge, the easy-to-handle advantage of desulfurization afterproduct and be subject to people and pay close attention to widely, its desulfuration efficiency can reach 85%.But semi-dry desulphurization still exist equipment huge, invest high shortcoming.According to the investment of coal-burning boiler desulfurizer and operating cost, no matter take above-mentioned which kind of scheme, all there are the problems such as cost of investment is high, operating cost is high, occupied ground requirement.In addition, this year, national environmental protection department improved coal-burning boiler emission standards for sulfur dioxide again and again, made major part already implement the improved power station of desulfurization and had desulfurization embarrassment not up to standard, therefore, should find a kind of can supplementing original desulfurizer, and simple and easy and cost low desulfurization program.

Summary of the invention

The present invention is in order to solve the existing above-mentioned deficiency of prior art, to propose a kind of structure ingenious, rationally distributed, can coordinate with former desulfurizer, to realize the horizontal semidry process desulfurizer of a kind of boiler back end ductwork of high-efficiency desulfurization.

Technical solution of the present invention is: the horizontal semidry process desulfurizer of a kind of boiler back end ductwork, comprise the housing 3 being arranged between boiler air preheater 1 and deduster 2, it is characterized in that: in described housing 3, on along air preheater 1 to the direction of deduster 2, be disposed with desulfurizing agent and carry spraying system 4, water smoke is carried spraying system 5 and purging system 6, wherein desulfurizing agent carries spraying system 4 to comprise that one is arranged on the desulfurizing agent storage tank 7 of housing 1 outside, on the desulfurizing agent transfer pipeline 8 of desulfurizing agent storage tank 7 ports of export, be provided with gas flowmeter 9, be provided with desulfurizing agent air pump with desulfurizing agent transfer pipeline 8 matches, end at desulfurizing agent transfer pipeline 8 is also provided with the desulfurizing agent nozzle 10 that is positioned at housing 3 inside, water smoke carries spraying system 5 to comprise that one is arranged on the water storage tank 11 of housing 3 outsides, on the water transfer pipeline 12 of water storage tank 11 ports of export, be provided with fluid flowmeter 13, be provided with water pump with water transfer pipeline 12 matches, end at water transfer pipeline 12 is also provided with the atomizer 14 that is positioned at housing 3 inside, in purging system 6, be provided with purging air pump, the gas outlet of purging system 6 is positioned at the bottom of housing 3, and towards the direction of deduster 2, in the interior part near deduster 2 of housing 3, be also provided with temperature sensor 15, described gas flowmeter 9, desulfurizing agent air pump, fluid flowmeter 13, water pump, purge the control that air pump is all connected with intelligence control system 16 with temperature sensor 15 and accepts intelligence control system 16.

Be provided with curved baffle 17 with described atomizer 14 matches, curved baffle 17 is between atomizer 14 and desulfurizing agent nozzle 10, and the opening of curved baffle 17 is towards deduster 2.

Described desulfurizing agent nozzle 10 and atomizer 14 are a plurality of, and housing 3 longitudinal center's place's being radially uniformly distributed along housing 3.

Described purging system 6 is provided with three gas outlets, these three gas outlets housing 3 axially on be equally spaced.

Compared with the existing technology, tool has the following advantages in the present invention:

The horizontal semidry process desulfurizer of boiler back end ductwork of this kind of version, it is simple in structure, designs ingenious, rationally distributed.Existing boiler desulfurization facility cannot further improve desulfuration efficiency, and improve on the basis of existing technology, needs a large amount of funds.For this problem, the present invention discloses a kind of can being arranged between boiler air preheater and deduster, boiler smoke is carried out to the structure of humidification activation desulfurization processing, coordinate with traditional desulfurizer, improve overall desulfuration efficiency, and the flue-gas temperature that enters deduster can be controlled at and be not less than 95 ℃, meet the temperature requirement of deduster to flue gas.This device can be used as the useful of traditional sulfur removal technology and supplements, or the independent desulfurizer as burning low-sulfur coal boiler.It improves desulfuration efficiency under the condition that increases a small amount of calcium sulfur ratio, meet the discharge standard of sulfur dioxide in flue gas, avoid device fouling, do not take new place, substantially do not increase flue gas resistance, operating cost is lower, therefore can say that it has possessed multiple advantage, be particularly suitable for applying in the art, its market prospects are very wide.

Accompanying drawing explanation

Fig. 1 is the structural representation of the embodiment of the present invention.

Fig. 2 is the top view of the embodiment of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing explanation the specific embodiment of the present invention.As shown in Figure 1 and Figure 2: the horizontal semidry process desulfurizer of a kind of boiler back end ductwork, comprise the housing 3 being arranged between boiler air preheater 1 and deduster 2, in housing 3, along the direction from air preheater 1 to deduster 2, be disposed with desulfurizing agent and carry spraying system 4, water smoke to carry spraying system 5 and purging system 6;

Described desulfurizing agent carries spraying system 4 to comprise that one is arranged on the desulfurizing agent storage tank 7 of housing 1 outside, at desulfurizing agent storage tank 7 ports of export, be provided with desulfurizing agent transfer pipeline 8, on desulfurizing agent transfer pipeline 8, be provided with gas flowmeter 9, be provided with desulfurizing agent air pump with desulfurizing agent transfer pipeline 8 also matches, end at desulfurizing agent transfer pipeline 8 is also provided with the desulfurizing agent nozzle 10 that is positioned at housing 3 inside, and in order to improve the mixed effect of desulfurizing agent and flue gas, described desulfurizing agent nozzle 10 is a plurality of, and housing 3 longitudinal center's place's being radially uniformly distributed along housing 3, all desulfurizing agent nozzles 10 are arranged side by side at the interior sustained height of housing 3, (as shown in Figure 2)

Described water smoke carries spraying system 5 to comprise that one is arranged on the water storage tank 11 of housing 1 outside, at water storage tank 11 ports of export, be provided with water transfer pipeline 12, on water transfer pipeline 12, be provided with fluid flowmeter 13, be provided with water pump with water transfer pipeline 12 matches, end at water transfer pipeline 12 is also provided with the atomizer 14 that is positioned at housing 3 inside, be provided with curved baffle 17 with described atomizer 14 matches, curved baffle 17 is between atomizer 14 and desulfurizing agent nozzle 10, and the opening direction of curved baffle 17 is towards deduster 2, and in order to improve the cooling-down effect of atomizer 14, described atomizer 14 is a plurality of, and housing 3 longitudinal center's place's being radially uniformly distributed along housing 3, all atomizers 14 are arranged side by side at the interior sustained height of housing 3, (as shown in Figure 2)

In described purging system 6, be provided with purging air pump, the gas outlet of purging system 6 is positioned at the bottom of housing 3, and towards the direction of deduster 2, and purging system 6 has three gas outlets, simultaneously these three gas outlets housing 3 axially on be equally spaced;

In the interior part near deduster 2 of housing 3, be also provided with temperature sensor 15, described gas flowmeter 9, desulfurizing agent air pump, fluid flowmeter 13, water pump, purging air pump and temperature sensor 15 are all connected with intelligence control system 16 and accept the control of intelligence control system 16.

The course of work of the horizontal semidry process desulfurizer of boiler back end ductwork of the embodiment of the present invention is as follows: first the housing of this device 3 is arranged between the air preheater 1 and deduster 2 of boiler, flue gas can the direction along the inner chamber of housing 3 from air preheater 1 to deduster 2 flow, in the process of flow of flue gas, desulfurizing agent is carried spraying system 4 work, desulfurizing agent air pump is injected in the desulfurizing agent in desulfurizing agent storage tank 7 in housing 3 by desulfurizing agent nozzle 10, and desulfurizing agent fully mixes with flue gas; Simultaneously water smoke carries spraying system 5 also to work, and water pump sprays the water in water storage tank 11 by atomizer 14, at the interior formation water smoke of housing 3, can with desulfurizing agent in the calcium oxide generation calcium hydroxide that reacts, can also reduce flue-gas temperature, make calcium hydroxide and SO ₂produce reaction.Curved baffle 17 with atomizer 14 phase configuration, be arranged between desulfurizing agent nozzle 10 and atomizer 14, can prevent that water smoke from directly contacting walling of flue, can also make partial fume not contact with water smoke and keep original temperature, the flue-gas temperature that finally makes to enter before deduster is not less than 95 ℃, meets the job requirement of deduster.The ash that falls producing due to flue gas humidification is continued to be blown in deduster 2 by purging system 6 to be processed, and prevents bottom fouling or the stifled ash of housing 3; Intelligence control system can be according to flue gas flow, SO ₂content and flue-gas temperature are come real-time monitoring atomizer 14 and desulfurizing agent nozzle 10, make this device maintain stable desulfuration efficiency.

Claims (4)

1. the horizontal semidry process desulfurizer of boiler back end ductwork, comprise the housing (3) being arranged between boiler air preheater (1) and deduster (2), it is characterized in that: in described housing (3), on along air preheater (1) to the direction of deduster (2), be disposed with desulfurizing agent and carry spraying system (4), water smoke is carried spraying system (5) and purging system (6), wherein desulfurizing agent carries spraying system (4) to comprise that one is arranged on the outside desulfurizing agent storage tank (7) of housing (1), on the desulfurizing agent transfer pipeline (8) of desulfurizing agent storage tank (7) port of export, be provided with gas flowmeter (9), be provided with desulfurizing agent air pump with desulfurizing agent transfer pipeline (8) matches, end at desulfurizing agent transfer pipeline (8) is also provided with the desulfurizing agent nozzle (10) that is positioned at housing (3) inside, water smoke carries spraying system (5) to comprise that one is arranged on the outside water storage tank (11) of housing (3), on the water transfer pipeline (12) of water storage tank (11) port of export, be provided with fluid flowmeter (13), be provided with water pump with water transfer pipeline (12) matches, end at water transfer pipeline (12) is also provided with the atomizer (14) that is positioned at housing (3) inside, purging system is provided with purging air pump in (6), the gas outlet of purging system (6) is positioned at the bottom of housing (3), and towards the direction of deduster (2), part near deduster (2) in housing (3) is also provided with temperature sensor (15), described gas flowmeter (9), desulfurizing agent air pump, fluid flowmeter (13), water pump, purge the control that air pump is all connected with intelligence control system (16) with temperature sensor (15) and accepts intelligence control system (16).

2. the horizontal semidry process desulfurizer of boiler back end ductwork according to claim 1, it is characterized in that: be provided with curved baffle (17) with described atomizer (14) matches, curved baffle (17) is positioned between atomizer (14) and desulfurizing agent nozzle (10), and the opening of curved baffle (17) is towards deduster (2).

3. the horizontal semidry process desulfurizer of boiler back end ductwork according to claim 2, it is characterized in that: described desulfurizing agent nozzle (10) and atomizer (14) are a plurality of, and housing (3) longitudinal center place's being radially uniformly distributed along housing (3).

4. the horizontal semidry process desulfurizer of boiler back end ductwork according to claim 3, is characterized in that: described purging system (6) is provided with three gas outlets, these three gas outlets housing (3) axially on be equally spaced.