CN2202247Y

CN2202247Y - Horizontal double-drum steam boiler

Info

Publication number: CN2202247Y
Application number: CN 94242202
Authority: CN
Inventors: 刘翔
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-06
Filing date: 1994-07-06
Publication date: 1995-06-28
Anticipated expiration: 2004-07-06

Abstract

The utility model discloses a horizontal double-drum steam boiler which is composed of a furnace chamber and a convection bank. The two regions are separated by a dividing wall and are communicated with each other at the opening below the dividing wall. The furnace chamber has no water cooled wall, however, the furnace chamber is provided with a double-layer fire grate, wherein, the upper layer is a water pipe fire grate, and a flue gas channel and a dirt settling chamber are formed around the convection bank between the boiler drums. A layer of smoke baffle plate is added in the middle part of the convection bank. The utility model can obtain enough heat energy from low heating value coal in the natural draft or lower flue gas flow velocity state. Furthermore, the utility model can effectively control smoke drain and noise pollution.

Description

Horizontal double-drum steam boiler

The utility model belongs to a kind of horizontal tubular boiler.

In manufacturing and designing in the industry of current Industrial Boiler, dominant ideas remain pursues overheavy firing and enhanced heat exchange, its major measure: the one, improve flue gas flow rate, and the 2nd, the ratio of increase radiation heating-surface.The former drawback is to make boiler plant increase the structure more sophisticated, also must increase the discharging and the noise pollution of flue dust simultaneously; The latter's drawback then is the use that has limited the low heat value coal.The various type of furnaces of being introduced among " Industrial Boiler " book (volume such as Zhang Yongzhao of Xi'an Communications University, the nineteen eighty-two version 6-11 of China Machine Press page or leaf) have embodied a concentrated reflection of above-mentioned dominant ideas.Be example now, its design feature is given a brief account with wherein SHL20-13 type boiler; This stove and accessory has the characteristics of large and medium-sized boiler, have the traveling-grate stoker and the ventilation of mechanization to slag tap, the disintegrating slag device, be provided with water-cooling wall in the hearth wall, drum and convection bank are positioned at the rear side of combustion chamber, gas fume after burning detours through the multilayer smoke baffle plate and enters back-end ductwork, also is provided with economizer, air preheater, superheater and steam soot-blower etc. in back-end ductwork.Owing to huge, the complex structure of its equipment, the coal calorific value is required high, and many defectives such as flue dust and noise pollution be serious are so can not be used as the heat energy power mechanism of block, city.

The purpose of this utility model is that aforementioned known boilers structure is improved, and makes simplified equipment, reduces soot emissions and noise pollution, and can be suitable for the use of low heat value coal.

The content of the technical solution of the utility model is: construct so horizontal pair of drum steam boiler, it is made up of combustion zone and convection bank district two parts, it is characterized in that:

I, described combustion zone and convection bank district are divided into former and later two spaces by partition wall; The space installing double-layer grate of front constitutes the anti-burner hearth that burns of naked light; The space of back forms exhaust gases passes and laying dust chamber around drum and convection bank, these forward and backward two spaces are connected by the opening under the partition wall.

Double-layer grate in II, the described stove hall, its lower floor is the metal bar shaped fire grate that ventilates and the slag that falls is used, and its upper strata is the fire grate shape water pipe that becomes a boiler radiation heating-surface part, and this water pipe is connected with the drum of boiler; Inboard wall of burner hearth is built into refractory material, does not add water-cooling wall.

III, in the middle part exhaust gases passes in described convection bank district, add one deck smoke baffle plate; Drum both sides below this convection bank district are recess laying dust chambers.

Advantage of the present utility model can be drawn by the analysis of said structure feature:

(1) the anti-combustion system that burns of double-layer grate naked light, and be in again in the burner hearth of no any wall-cooling surface outside the pipe furnace row that dewaters, this just helps improving fire box temperature, reduce Q3 value (heat loss due to unburned gas) and Q4 value (heat loss of imperfect solid combustion), and minimizing black smoke, enhancing are to the adaptability of low heating value coal.

(2) add the whole shape smoke baffle plate of one deck at middle part, convection bank district and can guarantee transversal flow, the enhancing heat exchange effect of flue gas in the convection bank district, can make the flue gas flow lengthening again, realize abundant heat exchange and dust deposition, and the resistance of air-flow is significantly less than the resistance that the multilayer smoke baffle plate of known technology brings in this case, thereby helps the employing of gravity-flow ventilation measure.

(3) cooperate gravity-flow ventilation and low flue gas flow rate, the laying dust chamber of vortex in the exhaust gases passes and bottom can be collected sedimentation effectively, reduces smoke discharge amount.

(4) burner hearth and convection bank separate out, water pipe, and grate area and heat convection can increase again synchronously, thereby the usefulness that makes gravity-flow ventilation and keep low flue gas flow rate is not fully exerted.Also just make in boiler plant, save huge such as economizer, deduster and even air-introduced machine etc., consume energy, need Operation and Maintenance and bring the device of noise pollution to become possibility.

Accompanying drawing provides the overall structure of horizontal pair of drum steam boiler plant described in the utility model.

Specific embodiment of the utility model can be described with reference to accompanying drawing: when fuel passes to seven drums 8 through the water in the anti-hyperthermia radiation heating pipe fire grate 1 that burns generation of naked light between the upper fire-grating 1 of stove hall 2 and lower fire grating 3, high-temperature flue gas under low flue gas flow rate state enters the convection bank district through the opening 11 of partition wall 10 bottoms, effect by smoke baffle plate 7, make high-temperature flue gas carry out transversal flow to convection bank 6, carry out sufficient heat exchange, meanwhile, flue gas realizes that in the vortex in convection bank district flue dust separates, precipitum falls into laying dust chamber, lower drum 5 both sides 4, regularly is eliminated.Close flue gas, enter atmosphere by chimney 9 at last in regulated discharge standard.

In order to suppress soot emissions better, can between the floss hole of boiler plant and chimney, install by-pass valve control, so that poke fire operating personnel, when going out cinder, prevent that flue dust from entering atmosphere.

When the flue of boiler between chimney is longer, can the pipe special axial id fan be installed at the smoke canal elbow place as one sees fit, with suitable adjustment air inducing power, under control flue dust and the standard compliant situation of noise pollution, keep certain combustion intensity and heat transfer intensity.

Claims

A kind of horizontal pair of drum steam boiler is made up of combustion zone and convection bank district two parts, it is characterized in that:

I, described combustion zone and convection bank district are divided into former and later two spaces by partition wall; The space installing double grate of front constitutes the anti-burner hearth that burns of naked light; The space of back forms exhaust gases passes and laying dust chamber around drum and convection bank, two spaces, front and back are connected by the opening under the partition wall;
Double-layer grate in II, the described burner hearth, its lower floor is the metal bar shaped fire grate that ventilates and the slag that falls is used, and its upper strata is the fire grate shape water pipe that becomes a boiler radiation heating-surface part, and this water pipe is connected with drum; The burner hearth inner arm is built into refractory material, no water-cooled heating surface on this inwall;
III, the whole shape smoke baffle plate of one deck is arranged in the middle part exhaust gases passes in described convection bank district; There is recess laying dust chamber drum both sides below this convection bank district.