Parallel flow heat accumulating type double-hearth lime kiln with two-stage calcination

Abstract

The parallel flow heat accumulating type double-hearth lime kiln comprises a hearth kiln I and a hearth kiln II, preheating zones are arranged at the upper end of the hearth kiln I and the upper end of the hearth kiln II, calcining zones are arranged in the middle of the hearth kiln I and the middle of the hearth kiln II, cooling zones are arranged at the lower end of the hearth kiln I and the lower end of the hearth kiln II, and cooling zones are arranged at the lower end of the hearth kiln II. A connecting channel is arranged at the joint of the first hearth kiln and the second hearth kiln. According to the double-chamber lime kiln, the damaged arc-shaped shell can be detached through the detachable chamber kiln shell, maintenance or overhaul is convenient, in addition, the reinforcing plates, the reinforcing grooves and the reinforcing pipes are arranged on the outer surface of the arc-shaped shell, the compression resistance and impact resistance of the double-chamber lime kiln are improved, the service life of the double-chamber lime kiln is prolonged, and the service life of the double-chamber lime kiln is prolonged. By arranging the heat preservation and insulation blocks made of the aluminum silicate ceramic fiber materials and combining the refractory lining built by the refractory bricks, the heat preservation and insulation performance is good, heat loss is effectively reduced, energy is saved, and consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lime production equipment technical field, concretely is a kind of two-stage calcination parallel flow regenerative double-chamber lime kiln. BACKGROUND

[0002] Traditional double-chamber lime kiln is mostly single-stage calcination, there is low thermal efficiency, high fuel consumption and uneven combustion and other problems, and two-stage calcination parallel flow regenerative double-chamber lime kiln is a kind of efficient, energy-saving lime production equipment, combined with double-chamber structure, parallel flow calcination and regenerative heat exchange technology, more energy-saving, calcined lime quality is better, can carry out continuous firing, calcined lime activity degree is high, quality is good.

[0003] The prior art discloses a double-chamber lime kiln for realizing parallel flow and counterflow synchronous calcination and in-furnace denitration, which is characterized in that a plurality of groups of main heating lances and auxiliary heating lance systems shared by coal and electricity or shared by gas and electricity are arranged in the first kiln chamber and the second kiln chamber to perform two-stage calcination, and the heat energy is converted and circulated through the annular passages of the first kiln chamber and the second kiln chamber, so that the heat energy distribution is more uniform, the production control is more convenient, and the product quality is easier to control.

[0004] The calcination zones of the first kiln chamber and the second kiln chamber are susceptible to damage or aging due to high temperature, pressure and other factors, and the integrated design makes it difficult to maintain or replace. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a two-stage calcination parallel flow regenerative double-chamber lime kiln to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a two-stage calcination parallel flow regenerative double-chamber lime kiln, comprising kiln one and kiln two, the upper ends of the kiln one and the kiln two are provided with preheating zones, the middle parts of the kiln one and the kiln two are provided with calcination zones, and the lower ends of the kiln one and the kiln two are provided with cooling zones, and a connecting passage is arranged at the connection between the kiln one and the kiln two.

[0007] The calcination zone comprises an arc-shaped inner shell, arc-shaped outer shells symmetrically arranged at the left and right ends outside the arc-shaped inner shell, mounting grooves arranged on the outer surfaces of the front and rear ends of the arc-shaped outer shells, clamping grooves arranged at the left and right ends of the mounting grooves, lock screw holes one arranged at the two sides of the mounting grooves, clamping plates clamped in the clamping grooves and the mounting grooves, lock screw holes two arranged at the two sides of the clamping plates, and lock bolts arranged between the lock screw holes two and the lock screw holes one.

[0008] In the above technical solution, the detachable kiln shell can be detached to facilitate maintenance or repair, and the arc-shaped outer shell and the clamping plate are connected by the lock bolt, so that the arc-shaped outer shells on both sides are separated.

[0009] As a further preferred embodiment of the present technical solution, the arc-shaped inner shell is arranged with an embedded groove in the circumferential direction, and the embedded groove is embedded with a heat insulation block.

[0010] In the above technical solution, the heat insulation block made of aluminum silicate ceramic fiber material has good heat insulation performance, effectively reduces heat loss, and saves energy.

[0011] As a further preferred embodiment of the present technical solution, the arc-shaped inner shell is arranged with a refractory lining on the inner side, and the refractory lining is formed by stacking refractory bricks.

[0012] In the above technical solution, the refractory lining formed by stacking refractory bricks has good heat insulation performance, effectively reduces heat loss, and saves energy.

[0013] As a further preferred embodiment of the present technical solution, the arc-shaped outer shell is arranged with a reinforcing plate on the outer surface, the reinforcing plate is arranged with a reinforcing groove on the inner side, and the reinforcing groove is fixedly connected with a reinforcing pipe.

[0014] In the above technical solution, the reinforcing plate, the reinforcing groove and the reinforcing pipe are arranged on the outer surface of the arc-shaped outer shell to improve the compression resistance and impact resistance of the double-chamber lime kiln and prolong the service life of the equipment.

[0015] As a further preferred embodiment of the present technical solution, the inner wall of the connecting channel is arranged with a wear-resistant ceramic lining.

[0016] In the above technical solution, the wear-resistant ceramic lining can effectively resist the impact and friction of abrasive materials, greatly reducing the wear rate of the equipment and prolonging the service life of the equipment.

[0017] As a further preferred embodiment of the present technical solution, the heat insulation block is made of aluminum silicate ceramic fiber material.

[0018] As a further preferred of the technical solution, the connecting channel is provided with a parallel flow heat storage device, including a honeycomb ceramic heat storage body and a reversing valve.

[0019] In the above technical solution, high-temperature flue gas flows out from a calcining chamber (such as chamber kiln 1), passes through the heat storage body in the channel, and the heat is absorbed by the heat storage material, and then low-temperature flue gas is discharged; when switched to the heat storage mode, cold air passes through the heat storage body from the opposite direction, absorbs heat to become high-temperature combustion-supporting air, and enters another chamber (chamber kiln 2) to participate in combustion.

[0020] The two-section calcining parallel flow heat storage type double-chamber lime kiln has the following beneficial effects:

[0021] (1) The detachable chamber kiln shell can be used for disassembling the damaged arc-shaped shell, facilitating maintenance or repair, and the reinforcing plate, reinforcing groove and reinforcing pipe arranged on the outer surface of the arc-shaped shell can improve the compression resistance and impact resistance of the double-chamber lime kiln and prolong the service life of the equipment.

[0022] (2) The heat insulation block made of aluminum silicate ceramic fiber material and the refractory lining formed by stacking refractory bricks have good heat insulation performance, effectively reducing heat loss and saving energy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a partial sectional view of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure inside the calcining zone of the utility model;

[0026] Figure 4 It is an enlarged view of the A figure of the utility model;

[0027] Figure 5 It is a schematic diagram of the structure of the heat insulation layer of the utility model;

[0028] In the figure: 1, chamber kiln 1; 2, chamber kiln 2; 3, preheating zone; 4, calcining zone; 5, cooling zone; 6, connecting channel; 41, refractory lining; 42, arc-shaped inner shell; 43, fitting groove; 44, heat insulation block; 45, arc-shaped outer shell; 451, clamping groove; 452, mounting groove; 453, locking screw hole 1; 454, clamping plate; 455, locking screw hole 2; 46, reinforcing plate; 461, reinforcing groove; 462, reinforcing pipe. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model.

[0030] The utility model provides technical scheme: as Figure 1 And Figure 2 As shown in the figure, in the embodiment, a two-section calcining parallel flow heat accumulating type double-chamber lime kiln comprises chamber kiln one 1 and chamber kiln two 2, the kiln body is composed of two parallel chambers, and calcining and heat accumulating are alternately carried out, each chamber is equipped with an independent burner, but only one chamber is in the burning state at the same time, the flow direction of the gas, air and waste gas is switched through the valve, the double-chamber role alternation is realized, the upper end of the chamber kiln one 1 and the chamber kiln two 2 is provided with a preheating zone 3, the middle part of the chamber kiln one 1 and the chamber kiln two 2 is provided with a calcining zone 4, the combustion flame and the limestone raw material move downward from the kiln top in the same direction, the high-temperature gas fully contacts the limestone, the limestone is preheated to the decomposition temperature (about 800 DEG C) at the upper part of the preheating zone 3, and the waste gas heat is absorbed by the heat accumulator, the temperature rises to 1000-1200 DEG C at the lower part of the calcining zone 4, and the calcium carbonate decomposition is completed, the lower end of the chamber kiln one 1 and the chamber kiln two 2 is provided with a cooling zone 5, the connecting channel 6 is arranged at the connecting position of the chamber kiln one 1 and the chamber kiln two 2, the wear-resistant ceramic lining is arranged on the inner wall of the connecting channel 6, the wear-resistant ceramic lining can effectively resist the impact and friction of the abrasive, greatly reduces the abrasion rate of the equipment, thereby prolonging the service life of the equipment, and the wear-resistant ceramic lining can resist the corrosion of various chemical media, the parallel flow heat accumulating device is arranged in the connecting channel 6 and comprises a honeycomb ceramic heat accumulator and a reversing valve; when the chamber kiln one 1 burns, the high-temperature waste gas enters the chamber kiln two 2 through the connecting channel and heats the heat accumulator in the chamber kiln two 2, the limestone in the chamber kiln two 2 is preheated, and the heat accumulator stores heat; after switching, when the chamber kiln two 2 burns, the cold air passes through the heat accumulator of the chamber kiln one 1, absorbs the stored heat and becomes high-temperature combustion-supporting air, improves the combustion efficiency, realizes the cyclic utilization of the waste gas heat and reduces the fuel consumption; when one chamber is in the calcining state, the other chamber is in the heat accumulating / preheating state, the roles are periodically switched, the flow direction of the gas, combustion-supporting air and waste gas is controlled through the reversing valve, and continuous production is ensured.

[0031] As Figure 3 And Figure 4As shown, the calcination zone 4 comprises an arc-shaped inner shell 42, and arc-shaped outer shells 45 are symmetrically arranged at the left and right ends outside the arc-shaped inner shell 42, mounting grooves 452 are arranged on the outer surfaces of the front and rear ends of the arc-shaped outer shells 45, clamping grooves 451 are arranged at the left and right ends of the mounting grooves 452, lock screw holes one 453 are arranged at the left and right sides of the mounting grooves 452, clamping plates 454 are clamped in the mounting grooves 452 and the clamping grooves 451, lock screw holes two 455 are arranged at the left and right sides of the clamping plates 454, lock bolts are arranged between the lock screw holes two 455 and the lock screw holes one 453, reinforcing plates 46 are arranged on the outer surfaces of the arc-shaped outer shells 45, reinforcing grooves 461 are arranged on the inner sides of the reinforcing plates 46, and reinforcing pipes 462 are fixedly connected in the reinforcing grooves 461, the detachable kiln shell can be used for disassembling the damaged arc-shaped outer shell 45, facilitating maintenance or repair, and the reinforcing plates 46, the reinforcing grooves 461 and the reinforcing pipes 462 arranged on the outer surfaces of the arc-shaped outer shells 45 can improve the compression resistance and impact resistance of the double-chamber lime kiln, prolong the service life of the equipment and ensure the overall stability of the kiln body under high-temperature working conditions.

[0032] As shown in the figure, Figure 5 The arc-shaped inner shell 42 is arranged with embedded grooves 43 in the circumferential direction, and heat insulation blocks 44 made of aluminum silicate ceramic fiber material are embedded in the embedded grooves 43, the aluminum silicate ceramic fiber has excellent high-temperature resistance and can maintain stable performance for a long time in a high-temperature environment and is not easy to melt or deform, and this feature enables it to withstand the heat of high-temperature equipment, and the fiber structure of the aluminum silicate ceramic fiber hinders heat transfer and has excellent heat insulation effect, which can effectively reduce energy waste, reduce heat loss and improve energy utilization efficiency, and the arc-shaped inner shell 42 is provided with a refractory lining 41 formed by stacking refractory bricks, and the heat insulation blocks 44 made of aluminum silicate ceramic fiber material and the refractory lining 41 formed by stacking refractory bricks have good heat insulation performance and effectively reduce heat loss.

[0033] The utility model provides a kind of two-section calcination's parallel flow regenerative double-chamber lime kiln, specific working principle is as follows: reinforcing plate 46, reinforcing groove 461 and reinforcing pipe 462 are set, improve the compression resistance and impact resistance of the double-chamber lime kiln, when the arc-shaped outer shell 45 of wear and tear is damaged and needs to be replaced, lock bolt connected between arc-shaped outer shell 45 and clamping plate 454 is disassembled, so that the arc-shaped outer shell 45 of two sides is separated;Heat insulation blocks 44 made of aluminum silicate ceramic fiber material are set, and the refractory lining 41 formed by stacking refractory bricks, so as to have good heat insulation performance.

[0034] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A two-stage calcining, co-current regenerative double shaft lime kiln comprising a first shaft kiln (1) and a second shaft kiln (2), characterised in that: The preheating zone (3) is arranged at the upper end of the kiln one (1) and the kiln two (2), the calcination zone (4) is arranged at the middle of the kiln one (1) and the kiln two (2), the cooling zone (5) is arranged at the lower end of the kiln one (1) and the kiln two (2), and the connecting channel (6) is arranged at the connection of the kiln one (1) and the kiln two (2). The calcination zone (4) comprises the arc-shaped inner shell (42), the arc-shaped outer shell (45) is symmetrically arranged at the left and right ends outside the arc-shaped inner shell (42), the mounting grooves (452) are arranged on the outer surfaces of the front and rear ends of the arc-shaped outer shell (45), the clamping grooves (451) are arranged at the left and right ends of the mounting grooves (452), the locking screw holes one (453) are arranged on the two sides of the mounting grooves (452), the clamping grooves (451) and the mounting grooves (452) are clamped with the clamping plates (454), the locking screw holes two (455) are arranged on the two sides of the clamping plates (454), and the locking screw holes two (455) and the locking screw holes one (453) are provided with the locking bolts.

2. A two-stage calcination, co-current regenerative double shaft lime kiln according to claim 1, characterized in that: The arc-shaped inner shell (42) is provided with the embedded grooves (43) arranged in the circumferential direction, and the embedded grooves (43) are embedded with the heat insulation blocks (44).

3. A two-stage calcination, parallel flow regenerative double shaft lime kiln according to claim 1, characterized in that: The arc-shaped inner shell (42) is provided with the refractory lining (41) on the inner side, and the refractory lining (41) is formed by stacking refractory bricks.

4. A two-stage calcination, parallel-flow regenerative double shaft lime kiln according to claim 1, characterized in that: The arc-shaped outer shell (45) is provided with the reinforcing plates (46) arranged on the outer surface, the reinforcing grooves (461) are arranged on the inner side of the reinforcing plates (46), and the reinforcing grooves (461) are fixedly connected with the reinforcing pipes (462).

5. A two-stage calcination, parallel flow regenerative double shaft lime kiln according to claim 1, characterized in that: The connecting channel (6) is provided with the wear-resistant ceramic lining on the inner wall.

6. A two-stage calcination, parallel flow regenerative double shaft lime kiln according to claim 2, characterized in that: The heat insulation blocks (44) are made of aluminum silicate ceramic fiber material.

7. A two-stage calcination, parallel-flow regenerative double shaft lime kiln according to claim 1, characterized in that: The connecting channel (6) is provided with the parallel flow heat storage device, which comprises the honeycomb ceramic heat storage body and the reversing valve. The connecting channel (6) is provided with the parallel flow heat storage device, which comprises the honeycomb ceramic heat storage body and the reversing valve.

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