CN110732235A

CN110732235A - flue gas desulfurization equipment based on circulating semidry method

Info

Publication number: CN110732235A
Application number: CN201911027976.7A
Authority: CN
Inventors: 骆光雷; 王庆欢; 王刚; 樊国庆; 侯荣; 韩青
Original assignee: Yanqi Jinhe Mountain Environmental Protection Technology Co Ltd; Xinjiang Jin He Shan Energy Technology Co Ltd
Current assignee: Yanqi Jinhe Mountain Environmental Protection Technology Co Ltd; Xinjiang Jin He Shan Energy Technology Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-01-31

Abstract

The invention relates to the technical field of flue gas desulfurization equipment, and discloses flue gas desulfurization equipment based on a circulating semidry method, which comprises a digestion tank, single-shaft stirring blades and a mixed atomizing pipe, wherein a heat exchange mechanism is arranged above an inner cavity of the digestion tank, the end of the heat exchange mechanism is communicated with the water inlet end of the mixed atomizing pipe, the heat exchange mechanism is a middle section of the mixed atomizing pipe communicated with the water outlet of a water pump, and the bottom surface of the heat exchange mechanism is contacted with a desulfurizing agent in the digestion tank.

Description

flue gas desulfurization equipment based on circulating semidry method

Technical Field

The invention relates to the technical field of flue gas desulfurization equipment, in particular to flue gas desulfurization equipment based on a circulating semidry method.

Background

At present, there are over forty kinds of flue gas desulfurization technologies for coal-fired industrial boilers, of which over ten kinds operate more stably and the desulfurization efficiency can reach the national allowable standard, including dry flue gas desulfurization by directly spraying lime/limestone and fluidized bed limestone in a furnace, calcium alkali method, amine alkali method, sodium alkali method, magnesium alkali method and other wet flue gas desulfurization.

The circulating semi-dry method utilizes the reaction to be carried out in three phases of gas, solid and liquid, and utilizes the sensible heat of the flue gas to evaporate the water in the absorption liquid, so that the final product is dry powder, and has the advantages that: the desulfurization is carried out in a gas, liquid and solid three-phase state, the process equipment is simple, and the product is dry CaSO₃、CaSO₄Easy to be treated, has no serious equipment corrosion and blockage and consumes less water.

In the circulating semi-dry desulfurization treatment process, a system configuration which is a slaking mixing humidification system is used, quicklime and water are slaked by a slaker firstly, so that the water content of a desulfurizer reaches 5-8%, then ash discharged by a dust remover is combined with ash overflowing from the slaker, the mixture is sprayed by atomized water, and the desulfurized circulating ash and the desulfurizer are fully mixed and fluidized in the mixer under the combined action of fluidized air and a double-shaft stirring blade.

In the process of digestion, water and quicklime react to generate heat, and the digester enters the mixer in an overflow mode, so that the heat generated on the upper surface of the digester can be substituted into the bottom by the blades, most of the heat is accumulated in the digester and cannot be well utilized, and energy is wasted.

Disclosure of Invention

Aiming at the defects of the prior flue gas desulfurization digestion mixer in the use process, the invention provides flue gas desulfurization equipment based on a circulating semidry method, which has the advantages of timely and full utilization of heat and high utilization efficiency and solves the problems in the prior art.

The invention provides flue gas desulfurization equipment based on a circulating semidry method, which comprises a digestion tank, a single-shaft stirring blade and a mixed atomizing pipe, wherein a heat exchange mechanism is arranged above an inner cavity of the digestion tank, the end of the heat exchange mechanism is communicated with the water inlet end of the mixed atomizing pipe, the heat exchange mechanism is a middle section of the mixed atomizing pipe communicated with the water outlet of a water pump, and the bottom surface of the heat exchange mechanism is in contact with a desulfurizer in the digestion tank.

Preferably, heat exchange mechanism comprises heat exchange tube and conducting strip, the heat exchange tube is fixed at the front and back both ends of digestion tank inner chamber, the conducting strip is equipped with two sets ofly and respectively symmetrical arrangement in the left and right sides of heat exchange tube bottom, the conducting strip is the circular arc, and is the same with the blade circular arc camber of unipolar stirring leaf.

Preferably, the bottom arc surface of the heat conducting fin is wave-shaped, and the wave-shaped is formed by overlapping and sequentially arranging a plurality of groups of semi-arcs.

Preferably, the heat exchange tube is a multi-level S-shaped coil, the coils are vertically arranged, the heat conducting fins are still located at the bottom, and the heat exchange tube connected with the heat conducting fins is a water inlet end.

The invention has the following beneficial effects:

1. according to the invention, the heat exchange mechanism is arranged at the upper part between the two single-shaft stirring blades of the digestion tank, and the heat exchange mechanism is communicated with the mixed atomizing pipe, so that the heat absorption in the digestion tank is brought to the mixed atomizing pipe by the water circulating through the heat exchange mechanism, and the heat is brought into the desulfurizer in the mixing tank by the mixed atomizing pipe.

2. According to the invention, the heat-absorbing contact area is increased and the heat exchange efficiency is improved by arranging the heat-conducting fins at the bottom of the heat exchange tube in the aspect of , and in addition, in the aspect of , the wave form of the heat-conducting fins and the single-shaft stirring blades can form a stirring effect, so that the lime hydration efficiency in the digestion tank is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the heat exchange mechanism of FIG. 1 according to the present invention.

In the figure: 1. a mixing box; 2. a digestion tank; 3. a double-shaft stirring blade; 4. a single-shaft stirring blade; 5. a fluidizing pipe I; 6. a desulfurizer outlet; 7. a digestion water inlet pipe; 8. a desulfurization raw material inlet pipe; 9. a fluidizing pipe II; 10. a mixing atomization tube; 11. a heat exchange mechanism; 11a, a heat exchange tube; 11b, a heat-conducting sheet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.

Please refer to fig. 1-2, flue gas desulfurization equipment based on circulating semidry process, including a mixing box 1, a digestion box 2 is arranged on the upper right side of the mixing box 1, the digestion box 2 is fixedly connected with the outer wall of the mixing box 1, a double-shaft stirring blade 3 is arranged in the mixing box 1, the blade of the double-shaft stirring blade 3 is circular, the inner bottom of the digestion box 2 is formed by fixedly connecting two identical circular arcs in a tangent manner, a single-shaft stirring blade 4 is respectively arranged in the two circular arcs, the single-shaft stirring blade 4 is t-shaped, the curvature of the stirring blade plate is identical to that of the inner bottom of the digestion box 2, the two circular arc plates are arranged in a staggered manner, the circular arc plate close to the mixing box 1 is in a lower position, are in a higher position, the bottom end of the mixing box 1 is provided with a fluidizing pipe i 5, the fluidizing pipe i 5 is communicated with a fluidizing fan, fluidizing air is fed into the mixing box 1, a desulfurizing air is provided with a desulfurizing agent outlet 6 on the side of the mixing box 1, the desulfurizing agent outlet 6 is used for feeding the desulfurizing agent mixed with the desulfurizing agent into a desulfurizing agent which is mixed in the mixing box 1 and feeding into a flue gas reactor, the desulfurizing agent which is arranged in the mixing box 1, the slaking mechanism, a desulfurizing agent inlet pipe 11 is arranged on the top end of the slaking mechanism, the slaking mechanism is provided with a lime mixing box 2, the slaking mechanism is provided with a lime water inlet pipe 11, the slaking mechanism is provided with the slak.

Establish heat transfer mechanism 11 through upper portion between two unipolar stirring leaves 4 at digestion tank 2, and by heat transfer mechanism 11 intercommunication mixed atomizing pipe 10, make the water of circulation heat transfer mechanism 11 take 2 internal heat absorption of digestion tank to mixed atomizing pipe 10 departments, and bring into in the desulfurizer in the mixing tank 1 by mixed atomizing pipe 10, because digestion tank 2 is top confined inner chamber, the cavity heat can carry out fine heat transfer to heat transfer mechanism 11 on it, through the aforesaid setting, can make in time the heat production in the equipment get into flue gas reactor through desulfurizer export 6, in order to improve flue gas desulfurization reaction process, to the evaporation effect of residual water volume, the energy rationalization utilizes.

Wherein, for the guarantee heat transfer efficiency, heat exchange mechanism 11 comprises heat exchange tube 11a and conducting strip 11b, and both ends around the 2 inner chambers of digestion tanks are fixed to heat exchange tube 11a, and conducting strip 11b is equipped with two sets ofly and respectively symmetrical arrangement in the left and right sides of heat exchange tube 11a bottom, and conducting strip 11b is the circular arc, and its blade circular arc camber with unipolar stirring leaf 4 is the same. Improve the area of contact to the lime material by conducting strip 11b to improve heat exchange efficiency, simultaneously, conducting strip 11b forms the space of crowding with unipolar stirring leaf 4, thereby the stirring digestion effect to upper portion lime in the digester 2 that can be fine. Wherein, for preventing the inslot accumulation lime between conducting strip 11b and the heat exchange tube 11a, two conducting strips 11 b's symmetry axis is two unipolar stirring leaf 4's symmetry axis, because two unipolar stirring leaf 4 are dislocation arrangement from top to bottom, thereby, two conducting strips 11b also are the slope and arrange, and the accessible is controlled in the digestion case 2 and is given birth to the lime volume and not more than the higher unipolar stirring leaf 4's in right side top mode and prevent that the lime from getting into its clearance and remain.

Wherein, the bottom arc surface of conducting strip 11b establishes to the wave, and it is formed by arranging in proper order that multiunit semicircle stacks, can advance steps and improve area of contact, and convex wave form contact surface can improve the stirring effect to quick lime powder to carry into quick lime digestion efficiency.

Wherein, for improving the heat transfer in steps in order to reach the effect of preheating to mixing atomizing pipe 10 internal water, establish heat exchange tube 11a as the S type coil pipe of multilevel, and the coil pipe is vertical to arrange from top to bottom, conducting strip 11b still is located the bottommost and the heat exchange tube 11a of being connected with conducting strip 11b is the end of intaking, the heat transfer is carried out to the internal water of heat exchange tube 11a preferentially to the maximum heat section that possesses by conducting strip 11b direct contact quicklime, then rises by the water in the heat exchange tube 11a, via the air heat transfer of digester 2 inner chambers, thereby reach best heat transfer effect under the combination.

For the invention, it should be noted that in the cyclic semi-dry desulfurization process, the liquid desulfurizer is sprayed into the reactor, the water content of the liquid desulfurizer is , which is used for desulfurization reaction, is used for reducing the flue gas temperature, which is to separate out more liquid water vapor and increase the reaction surface area, so as to increase the desulfurization efficiency, but the large water spray amount causes the wall adhesion problem, which easily causes corrosion in the equipment, and the small water spray amount causes the initial mixing stage of the desulfurizer and the flue gas, the flue gas temperature is reduced, and the flue gas saturated state contains less water vapor, which affects the desulfurization reaction in the latter half of the reactor.

It is noted that, herein, relational terms such as , second, and the like are used solely to distinguish entities or operations from another entities or operations without necessarily requiring or implying any actual such relationship or order between such entities or operations, further, the terms "comprise," "include," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

flue gas desulfurization equipment based on a circulating semidry method comprises a digestion tank (2), a single-shaft stirring blade (4) and a mixed atomizing pipe (10), and is characterized in that a heat exchange mechanism (11) is arranged above an inner cavity of the digestion tank (2), the end of the heat exchange mechanism (11) is communicated with the water inlet end of the mixed atomizing pipe (10), the heat exchange mechanism (11) is a middle section of the mixed atomizing pipe (10) communicated with the water outlet of a water pump, and the bottom surface of the heat exchange mechanism (11) is in contact with a desulfurizing agent in the digestion tank (2).
2. The flue gas desulfurization equipment based on the cyclic semidry process according to claim 1, wherein the heat exchange mechanism (11) is composed of heat exchange tubes (11 a) and heat conducting fins (11 b), the heat exchange tubes (11 a) are fixed at the front and rear ends of the inner cavity of the digestion tank (2), two sets of the heat conducting fins (11 b) are arranged and symmetrically arranged at the left and right sides of the bottom end of the heat exchange tubes (11 a), and the heat conducting fins (11 b) are circular arcs and have the same curvature as the circular arcs of the blades of the single-shaft stirring blades (4).
3. The flue gas desulfurization equipment based on the cyclic semidry method according to claim 2, wherein the bottom arc surface of the heat conducting strip (11 b) is wave-shaped, and the wave-shaped is formed by overlapping and sequentially arranging a plurality of groups of semi-arcs.
4. The flue gas desulfurization equipment based on the cyclic semidry process according to claim 2, wherein the heat exchange tubes (11 a) are multi-stage S-shaped coils, the coils are vertically arranged up and down, the heat conducting fins (11 b) are still positioned at the lowermost ends, and the heat exchange tubes (11 a) connected with the heat conducting fins (11 b) are water inlet ends.