CN2784762Y - Flue-gas desulfurization device for thermal power plant - Google Patents

Abstract

Flue gas desulfurization purge device for thermal power plant belongs to the coal boiler auxiliary environmental protection equipment. The sulfur dioxide absorbing tower is provided with a gunite layer; the lower part of the tower is in the structure of hollow; a settling tank and a mortar tank are arranged at the exterior of the sulfur dioxide absorbing tower; a draining pipeline and an absorbent circulating pump respectively communicate the settling tank and the mortar tank with the sulfur dioxide absorbing tower; the serum pump communicates the limestone or the lime serum jar with the absorbent circulating pump. Both ends of the waste water loop back pipeline which is provided with a waste water loop back pump are respectively arranged in the settling tank and the mortar tank; the settling tank is provided with a mortar pump and a precipitate discharge pipeline; a powder coal ash transport pipeline, a boiler continuous blow-down water pipeline, a technical water pipeline transmitting outlet are arranged in the mortar tank. The device realizes the work that mixing and pulping the limestone or the lime with the powder coal ash which after the low sulfur coal burning, and they are served as desulfuration absorbent to process flue gas desulfurization; it is provided with the characteristics of high desulfuration efficiency, low operation cost, doesn't scale, and is convenient to maintain.

Description

The flue gas desulphurization purifier

Technical field

The utility model belongs to briquette boiler subsidiary engine environmental protection equipment.

Background technology

China is to be the country of main energy sources with the coal, atmosphere pollution mainly is coal-smoke pollution, wherein the environmental pollution that causes of the sulfur dioxide of coal fired thermal power plant discharging is even more serious, become the important factor in order of restriction Chinese national economy and social sustainable development, therefore, thermal power plant being carried out flue gas desulfurization has been China's the most urgent task in Air Pollution Control field with the control sulfur dioxide pollution.At present, wet desulphurization account for the world install flue gas desulfurization the unit total capacity 85%, wherein lime stone (lime) washing method accounts for 36.7%, other wet desulphurization technology account for 48.3%.Because China is vast in territory, the coal-fired sulfur content of the condition difference of various places power plant, particularly various places differs greatly, and does not also have a kind of wet process of FGD technology and equipment can generally be applicable to the flue gas desulfurization of Chinese large-sized coal-fired power station boiler.In addition, the wet desulphurization technology of thermal power plant's application still exists fouling, huge, the problems such as power consumption is big, operating cost height of burn into investment in varying degrees at home.So, press for the wet desulphurization equipment that the exploitation of suiting measures to local conditions is fit to the different condition needs at present.

Summary of the invention

The purpose of this utility model is exactly technical problem and the defective that exists at the wet desulphurization technology and the equipment that adopt single lime stone or lime as desulfurization absorbent, bigger in conjunction with the former coal reserves of the northern area of China low-sulfur, use the flyash that produces behind the low-sulfur coal and have high basicity, with the content height that uses the mortar neutral and alkali material that the coal ash that produces behind the low-sulfur coal makes, the characteristic that sulfur in smoke is had very strong absorbability, design provides a kind of flue gas desulphurization purifier, by in this device, the flyash of low-sulfur coal and the slurries of lime stone or lime being made mixed serum, and finish the desulfurizing and purifying operation as the composite absorber of desulfurization, reach and not only have quite high desulfuration efficiency, and can reduce the purpose of wet method fume desulfurizing system operating cost greatly, solve simultaneously and only adopt lime stone or lime as the ubiquitous scale problems of the wet desulfurization system of desulfurizing agent.

Basic design of the present utility model is, below double-deck demister and fresh water (FW) washer jet, be provided with by the gunite layer of carrying the absorbent slurry pipeline to form at chamber, sulfur dioxide absorption tower high inside, spiral nozzle is packed on the conveying absorbent slurry pipeline of gunite layer, and the bottom is hollow structure in the chamber, sulfur dioxide absorption tower; Exterior arrangement sedimentation basin and mortar pool on the sulfur dioxide absorption tower; One end of plasma discharge pipeline is connected on the bottom, sulfur dioxide absorption tower, and its other end is configured in the sedimentation basin pond; Absorbent circulation pump intake and outlet are connected with mortar pool and gunite layer respectively, and slurries pump intake and outlet are communicated with lime stone or lime white flow container and absorbent circulating pump suction inlet respectively; The waste water backpass ductwork two ends that are being equipped with waste water loopback pump are configured in respectively in sedimentation basin and the mortar pool, and two ponds are communicated with; On the sedimentation basin bottom, install the sediment discharge line that has slurry pump; The conveying outlet of fly ash pipe, continuous blowdown system of boiler waterpipe and fresh water (FW) pipeline all is configured in the mortar pool; In mortar pool, be equipped with agitator, so far constituting the flue gas desulphurization purifier.

The utility model has realized that flyash mixed pulp after lime stone or lime and the low-sulfur coal burning as desulfurization absorbent, has following characteristics: (1), desulfuration efficiency height, and reduced the operating cost of wet method fume desulfurizing system significantly; (2), lime stone or lime utilization rate height, flyash is cheap, desulfurization absorbent is finished send into after the desulfurization ash to be abandoned, is not only made desulfurizer simple and reliable, and solved single with lime stone or lime as the ubiquitous scale problems of the wet desulphurization device of desulfurization absorbent; (3), complete unit is reliable, non-scaling stops up, and is convenient to safeguard and maintenance easy operating control.

Description of drawings

Accompanying drawing is the overall assembly structure schematic diagram of flue gas desulphurization purifier.

Piece number explanation among the figure: 1, flue 2, gas bypass import baffle plate 3, gas bypass outlet damper 4, flue gas main road import baffle plate 5, sulfur dioxide absorption tower 6, gunite layer 7, spiral nozzle 8, double-deck demister 9, fresh water (FW) washer jet 10, flue gas main road outlet damper 11, cooling tower or chimney 12, absorbent circulating pump 13, slush pump 14, waste water loopback pump 15, slurry pump 16, lime stone or lime white flow container 17, mortar pool 18, sedimentation basin 19, fresh water (FW) pipeline 20, water pipe 21, lime stone or pulverized limestone conveyance conduit 22, fly ash pipe 23, continuous blowdown system of boiler waterpipe 24, fresh water (FW) pipeline 25, plasma discharge pipeline 26, waste water backpass ductwork 27, sediment discharge line 28, agitator

The specific embodiment

Below in conjunction with accompanying drawing the utility model optimum implementation is described in detail.The flue gas desulphurization purifier comprises by flue (1), flue gas main road import baffle plate (4), inner chamber top installs the sulfur dioxide absorption tower (5), flue gas main road outlet damper (10), cooling tower of double-deck demister (8) and fresh water (FW) washer jet (9) or wet process of FGD passage that chimney (11) constitutes and the gas bypass passage that is made of flue (1), gas bypass import baffle plate (2), gas bypass outlet damper (3), cooling tower or chimney (11); Fresh water (FW) pipeline (19) is communicated with fresh water (FW) washer jet (9); Between fresh water (FW) pipeline (19) and lime stone or lime white flow container (16), water pipe (20) is installed, with its connection; Lime stone or pulverized limestone conveyance conduit (21) are connected with lime stone or lime white flow container (16); It is characterized in that being provided with by the gunite layer (6) of carrying the absorbent slurry pipeline to form in double-deck demister (8) and fresh water (FW) washer jet (9) below at chamber, sulfur dioxide absorption tower (5) high inside, spiral nozzle (7) is packed on the conveying absorbent slurry pipeline of gunite layer (6); The bottom is hollow structure in the chamber, sulfur dioxide absorption tower (5); Exterior arrangement sedimentation basin (18) and mortar pool (17) in sulfur dioxide absorption tower (5); One end of plasma discharge pipeline (25) is connected on the bottom, sulfur dioxide absorption tower (5), and its other end is configured in sedimentation basin (18) pond; The suction inlet of absorbent circulating pump (12) and outlet are connected with mortar pool (17) and gunite layer (6) respectively, and the suction inlet of slush pump (13) and outlet are communicated with lime stone or lime white flow container (16) and absorbent circulating pump (12) suction inlet respectively; Waste water backpass ductwork (26) two ends that are being equipped with waste water loopback pump (14) are configured in respectively in sedimentation basin (18) and the mortar pool (17), and two ponds are communicated with; On sedimentation basin (18) bottom, install the sediment discharge line (27) that has slurry pump (15); The conveying outlet of fly ash pipe (22), continuous blowdown system of boiler waterpipe (23) and fresh water (FW) pipeline (24) all is configured in mortar pool (17) pond.Equipped agitator (28) in mortar pool (17).

The course of work is as follows: lime stone or lime slurry as absorbent stir preparation in lime stone or lime white flow container 16; Pulverized fuel ash slurry as absorbent another part stirs preparation in mortar pool 17; Lime stone for preparing in serum pot 16 or lime slurry are sent into the inlet of absorbent circulating pump 12 by slush pump 13, the pulverized fuel ash slurry that sucks from mortar pool 17 with circulating pump 12 mixes, and lime stone or lime and flyash mixed serum are transported to the top on sulfur dioxide absorption tower 5 by circulating pump 12, be ejected into downwards in the sulfur dioxide absorption tower 5 after atomizing by the spiral nozzle 7 on the two-layer gunite layer 6; Flue gas from boiler enters in the sulfur dioxide absorption tower 5 also upwards mobile by flue 1 and flue gas main road import baffle plate 4, and drip with reflux type by the lime stone that flows downward, be atomized or lime and flyash mixed serum and to be washed, gas is able to fully contact with slurries, removes gases such as sulfur dioxide, sulfur trioxide, hydrogen chloride in the mode that absorbs; The flue gas that the process cleaning equipment is handled is flowed through and is positioned at the two-layer demister 8 on gunite layer 6 tops, and slurries droplet entrained in the cleaning flue gases is removed; The fresh water (FW) that fresh water (FW) pipeline 19 is sent into washes by the regular demister of fresh water (FW) nozzle; At last, the clean flue gas of handling through cleaning equipment in sulfur dioxide absorption tower 5 is admitted in cooling tower or the chimney 11 by flue gas main road outlet damper 10, is discharged in the atmosphere; Lower curtate on sulfur dioxide absorption tower 5, lime stone and the powder ash mixed serum of finishing sulfur removal technology flow directly into sedimentation basin 18 by plasma discharge pipeline 25, pass through depositing technology, sediment is sent into the ash field by slurry pump 15 by sediment discharge line 27, and waste water that depositing technology is separated out is then sent into mortar pool 17 with waste water loopback pump 14 by waste water backpass ductwork 26 and participated in the pulverized fuel ash slurries preparation; In sulfur dioxide absorption tower 5, the part of damage by water consumption is compensated by the fresh water (FW) of mend in the absorption tower, and another part then passes through continuous blowdown system of boiler waterpipe 23 and fresh water (FW) pipeline 24 respectively by sewer and fresh water (FW) and sends into mortar pool 17 and compensated.

Claims (2)

1, a kind of flue gas desulphurization purifier, this device comprise by flue (1), flue gas main road import baffle plate (4), inner chamber top installs the sulfur dioxide absorption tower (5), flue gas main road outlet damper (10), cooling tower of double-deck demister (8) and fresh water (FW) washer jet (9) or wet process of FGD passage that chimney (11) constitutes and the gas bypass passage that is made of flue (1), gas bypass import baffle plate (2), gas bypass outlet damper (3), cooling tower or chimney (11); Fresh water (FW) pipeline (19) is communicated with fresh water (FW) washer jet (9); Between fresh water (FW) pipeline (19) and lime stone or lime white flow container (16), water pipe (20) is installed, with its connection; Lime stone or pulverized limestone conveyance conduit (21) are connected with lime stone or lime white flow container (16); It is characterized in that being provided with by the gunite layer (6) of carrying the absorbent slurry pipeline to form in double-deck demister (8) and fresh water (FW) washer jet (9) below at chamber, sulfur dioxide absorption tower (5) high inside, spiral nozzle (7) is packed on the conveying absorbent slurry pipeline of gunite layer (6); The bottom is hollow structure in the chamber, sulfur dioxide absorption tower (5); Exterior arrangement sedimentation basin (18) and mortar pool (17) in sulfur dioxide absorption tower (5); One end of plasma discharge pipeline (25) is connected on the bottom, sulfur dioxide absorption tower (5), and its other end is configured in sedimentation basin (18) pond; The suction inlet of absorbent circulating pump (12) and outlet are connected with mortar pool (17) and gunite layer (6) respectively, and the suction inlet of slush pump (13) and outlet are communicated with lime stone or lime white flow container (16) and absorbent circulating pump (12) suction inlet respectively; Waste water backpass ductwork (26) two ends that are being equipped with waste water loopback pump (14) are configured in respectively in sedimentation basin (18) and the mortar pool (17), and two ponds are communicated with; On sedimentation basin (18) bottom, install the sediment discharge line (27) that has slurry pump (15); The conveying outlet of fly ash pipe (22), continuous blowdown system of boiler waterpipe (23) and fresh water (FW) pipeline (24) all is configured in mortar pool (17) pond.

2, flue gas desulphurization purifier according to claim 1 is characterized in that equipped agitator (28) in mortar pool (17).

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