CN113651620A

CN113651620A - Ceramic high-wear-resistance sealing refractory brick for ceramic heat exchanger and manufacturing method thereof

Info

Publication number: CN113651620A
Application number: CN202110930812.6A
Authority: CN
Inventors: 汤闻平; 陶平; 汤勤娟
Original assignee: Yixing Haike Kiln Engineering Co ltd
Current assignee: Yixing Haike Kiln Engineering Co ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2021-11-16
Anticipated expiration: 2041-08-13
Also published as: CN113651620B

Abstract

The invention discloses a ceramic high-wear-resistance sealed refractory brick for a ceramic heat exchanger and a manufacturing method thereof. The manufacturing method comprises the following steps: s1 building a framework, S2 prefabricating a refractory brick body, S3 calcining the refractory brick body, and S4 steam curing. The refractory brick provided by the invention enhances the protection of the ceramic heat exchanger, improves the high temperature resistance effect, has a good heat preservation effect, and forms an effective temperature control system in the refractory brick.

Description

Ceramic high-wear-resistance sealing refractory brick for ceramic heat exchanger and manufacturing method thereof

Technical Field

The invention relates to the technical field of preparation of refractory bricks of ceramic heat exchangers, in particular to a ceramic high-wear-resistance sealing refractory brick for a ceramic heat exchanger and a manufacturing method thereof.

Background

The ceramic heat exchanger is a novel tube array type high-temperature heat energy recovery device, the main component of the ceramic heat exchanger is silicon carbide, the ceramic heat exchanger can be widely applied to industries such as metallurgy, machinery, building materials, chemical engineering and the like, and can directly recover the high-temperature smoke waste heat of 850-plus-1400 ℃ discharged by various industrial kilns so as to obtain high-temperature combustion-supporting air or process gas. Half of the existing common refractory bricks are fired by refractory clay or other refractory raw materials, are faint yellow or brown, are mainly used for building smelting furnaces, can resist the high temperature of 1580-1770 ℃, have certain shapes and sizes, and can be divided into fired bricks, unfired bricks, fused cast bricks and refractory heat-insulating bricks according to a preparation process method; can be divided into standard bricks, common bricks, special shaped bricks, etc. according to the shape and size. Can be used as high-temperature building materials and structural materials of construction kilns and various thermal equipment, and can bear various physical and chemical changes and mechanical actions at high temperature. Such as refractory clay bricks, high alumina bricks, silica bricks, magnesia bricks, etc.

However, the refractory bricks used in the ceramic heat exchanger have high required performance, and the general refractory bricks are often difficult to meet the internal conditions of some special ceramic heat exchangers, so that the performance of the refractory bricks is required to be improved, and the internal use requirements of various ceramic heat exchangers are met.

Patent CN211691039U discloses a compound wear-resisting resistant firebrick, including resistant firebrick, resistant firebrick one side is provided with the lug, the lug sets up as an organic whole with resistant firebrick, resistant firebrick keeps away from lug one side and is provided with recess (21), inside lug embedding recess (21), both sides are provided with the ceramic layer about resistant firebrick, the ceramic layer suppression is in resistant firebrick both sides about. The utility model discloses the suppression of resistant firebrick both sides has the ceramic layer, when high temperature fires resistant firebrick, and the ceramic layer receives high temperature after to form the ceramic face, and the ceramic face has stronger wearability, can reduce resistant firebrick's wearing and tearing, prolongs resistant firebrick's life. However, the heat conduction, radiation and heat preservation effects inside the heat pipe are not good.

Disclosure of Invention

Aiming at the problems, the invention provides a ceramic high-wear-resistance sealing refractory brick for a ceramic heat exchanger and a manufacturing method thereof.

The technical scheme of the invention is as follows:

a ceramic high-abrasion-resistance sealing refractory brick for a ceramic heat exchanger comprises a refractory brick body, wherein a supporting block is arranged in the middle of the refractory brick body, grooves are symmetrically formed in the upper portion and the lower portion of the supporting block, two groups of heat absorbing plates for absorbing heat are arranged on the upper surface and the lower surface of the refractory brick body, the two groups of heat absorbing plates on the same side face are symmetrical relative to the supporting block, a group of heat transfer rods are arranged at the centers of the heat absorbing plates towards one side inside the refractory brick body, spiral hollow pipes are arranged at the tail ends of the heat transfer rods, the spiral hollow pipes extend to the middle of the refractory brick body from the tail ends of the heat transfer rods, the radius of the spiral hollow pipes is gradually increased, the upper group of spiral hollow pipes and the lower group of spiral hollow pipes are symmetrically arranged, and a heat conduction pipe group is arranged between the upper group of spiral hollow pipes and the lower group of spiral hollow pipes;

the heat conduction pipe set comprises 3 groups of transverse pipes arranged at equal intervals and 3 groups of longitudinal pipes arranged at equal intervals, the transverse pipes and the longitudinal pipes are located on the same horizontal plane and are arranged in a staggered welding mode, 9 connecting points are arranged on the transverse pipes and the longitudinal pipes, a group of auxiliary heat conduction pipes are arranged on the upper side and the lower side of each connecting point located at 4 top points, a group of vacuum heat conduction balls are arranged on the connecting points located at the middle portions, and the upper ends and the lower ends of the other 4 connecting points are respectively connected with the upper spiral hollow pipe group and the lower spiral hollow pipe group through a group of connecting rods in a corresponding mode.

Furthermore, the transverse pipes of the two heat conduction pipe sets penetrate through the middle of the supporting block and are connected in a one-to-one correspondence mode, the heat conductivity inside the brick body is enhanced, cracking is prevented, and the fixing stability is improved.

Furthermore, the tail end of the auxiliary heat conduction pipe extends to the surface of the refractory brick body and is provided with a first heat conduction sheet for promoting heat transfer between bricks, and the tail ends of the transverse pipe and the longitudinal pipe both extend to the surface of the refractory brick body and are provided with a second heat conduction sheet for enhancing heat transfer between the bricks.

Further, the refractory brick body comprises the following components in percentage by mass: 50-55% of alumina, 24-26% of mullite fine powder and rho-Al₂O₃Binding agent 3-6 percent of fused magnesia powder, 8 to 10 percent of fused magnesia powder and the balance of clay, and the refractory brick body has good heat and shock resistance, wherein rho-Al₂O₃The binding agent has the characteristics of high temperature resistance, corrosion resistance and good volume stability, not only plays the role of the binding agent, but also is a high-grade refractory oxide, and the strength of the refractory brick body is higher by promoting slurry flocculation.

Furthermore, the spiral hollow pipe is filled with 240-mesh quartz sand grains with the grain size of 200-.

Furthermore, the vacuum heat conduction ball is hollow, and a plurality of hot melting grooves are circumferentially arranged on the outer wall of the vacuum heat conduction ball, so that the fixing effect between the refractory brick body and the vacuum heat conduction ball is enhanced.

Furthermore, the material of the supporting block is spinel, the heat absorbing plate and the first and second heat conducting fins are made of silicon carbide materials, the specific heat capacity of the heat absorbing plate and the first and second heat conducting fins is lower than that of the refractory brick body, and the spiral hollow tube, the heat conducting tube set and the auxiliary heat conducting tube are all made of 60W25Ni15Cr alloy, so that the heating speed of the heat absorbing plate and the heat conducting fins is higher than that of the refractory brick body.

The invention also provides a manufacturing method of the ceramic high-wear-resistance sealing refractory brick, which comprises the following steps:

s1 building a skeleton: placing a supporting block in a designated mould, and building a spiral hollow pipe, a heat conduction pipe set and an auxiliary heat conduction pipe at corresponding positions;

s2 prefabricating a refractory brick body: premixing raw materials of a refractory brick body according to the component ratio, then injecting water accounting for 25-30% of the total mass of the raw materials, continuously mixing and stirring for 0.5h to obtain mixed slurry, simultaneously preparing foaming agent accounting for 0.3% of the total mass of the raw materials into stable foam liquid, mixing the mixed slurry and the foam liquid, continuously stirring for 0.85h, injecting into a mold, vibrating to remove large bubbles, drying for 1-2h at 35 ℃, and preheating for 24-30h at 120-130 ℃ under vacuum condition to obtain a green body;

s3 calcining the refractory brick body: placing a heat absorbing plate, a first heat conducting sheet and a second heat conducting sheet which are prepared in advance at a corresponding reserved position of the green body, and calcining the green body at 1420-1430 ℃ for 2-3h to obtain a refractory brick;

s4 steam curing: putting the refractory bricks into a steam furnace, controlling the temperature at 85-90 ℃, and curing the surfaces of the refractory bricks by using hot steam for 24 hours.

Further, in the step S2, the stirring speed is controlled at 80r/min for 5min, then the stirring speed is increased to 120r/min for further stirring for 15min, water is injected while the stirring speed is maintained, and the foaming agent, the poly hydroxy acid water reducing agent, the triethylene glycol shrinkage reducing agent, the polypropylene fibers, the floating beads and the water are mixed in a mass ratio of 1: 0.2: 0.3: 0.05: 2.5: 16, weighing, proportioning, foaming by using a high-pressure foaming machine, wherein the foaming agent is a sodium dodecyl sulfate foaming agent, the stirring speed after injecting the foaming liquid is 200r/min, the stirring time is 60s, and ultrasonic vibration is used for vibration, so that the foaming effect is better, and the obtained refractory brick body is more uniform, compact and light.

The invention has the beneficial effects that:

(1) according to the refractory brick, the internal structure of the refractory brick is improved, so that high temperature in the ceramic heat exchanger is not easily transferred to the outer wall, the protection of the ceramic heat exchanger is enhanced, the high temperature resistant effect is improved, the temperature change speed in the refractory brick body is reduced, the heat insulation effect is achieved, and an effective temperature control system is formed in the refractory brick.

(2) According to the invention, the spiral hollow tube is arranged and filled with quartz sand grains, so that the heating speed of the refractory brick is reduced, the problems of crack and crack of the refractory brick body caused by too high temperature rise are solved, the heat conduction in the refractory brick is further reduced by arranging the vacuum heat conduction ball, meanwhile, the discharge of heat energy in the refractory brick is improved by arranging the auxiliary heat conduction pipe and filling the quartz sand grains with different grain sizes, meanwhile, the stability is high, and the heat conduction performance among the refractory bricks is good.

(3) The manufacturing method of the refractory brick is reasonable and efficient, does not damage the internal structure of the refractory brick, has high mechanical strength, good durability, high wear resistance and light weight, and prevents the physical and chemical properties of the formed refractory brick from being reduced by a steam curing method.

Drawings

FIG. 1 is a schematic view of the overall construction of a refractory brick of the present invention;

FIG. 2 is a schematic view of the internal structure of the refractory brick of the present invention;

FIG. 3 is a front view of the internal construction of the refractory brick of the present invention;

FIG. 4 is a top view of the internal structure of the refractory brick of the present invention;

FIG. 5 is a side view of the internal structure of the refractory brick of the present invention;

FIG. 6 is a schematic view of the structure of the auxiliary heat pipe and the vacuum heat-conducting ball of the refractory brick of the present invention;

FIG. 7 is a cross-sectional view of a vacuum heat-conducting sphere of the refractory block of the present invention.

The heat-conducting brick comprises a refractory brick body 1, a supporting block 2, a groove 21, a heat absorbing plate 3, a heat conducting rod 31, a spiral hollow pipe 4, a heat conducting pipe set 5, a transverse pipe 51, a longitudinal pipe 52, a connecting point 53, a connecting rod 54, a second heat conducting sheet 55, an auxiliary heat conducting pipe 6, a first heat conducting sheet 61, a vacuum heat conducting ball 7 and a hot melting groove 71.

Detailed Description

Example 1

As shown in fig. 1 and 2, the ceramic high wear-resistant sealing refractory brick for the ceramic heat exchanger comprises a refractory brick body 1, wherein the refractory brick body 1 comprises the following components in percentage by mass: 52% of alumina, 25% of mullite fine powder, 4% of a binding agent, 9% of fused magnesia powder and the balance clay, wherein the binding agent is rho-Al₂O₃The binder, 1 middle part of firebrick body is equipped with supporting shoe 2, the material of supporting shoe 2 is spinel, 2 upper portions of supporting shoe and lower part symmetry are equipped with recess 21, firebrick body 1 upper and lower surface all is equipped with two sets of absorber plates 3 that are used for absorbing the heat, it is symmetrical about supporting shoe 2 to be located two sets of absorber plates 3 of same side, absorber plate 3 center is equipped with a set of heat transfer rod 31 towards 1 inside one side of firebrick body, heat transfer rod 31 end is equipped with spiral hollow tube 4, spiral hollow tube 4 is extended by heat transfer rod 31 endThe radius of the spiral hollow pipes 4 increases gradually from the middle part of the refractory brick body 1, the upper and lower groups of spiral hollow pipes 4 are symmetrically arranged, and a heat conduction pipe group 5 is arranged between the upper and lower groups of spiral hollow pipes 4;

as shown in fig. 3-7, the heat conduction pipe set 5 includes 3 sets of equally spaced

transverse pipes

51 and 3 sets of equally spaced longitudinal pipes 52, the transverse pipes 51 and the longitudinal pipes 52 are located on the same horizontal plane and are welded in a staggered manner, the transverse pipes 51 and the longitudinal pipes 52 are provided with 9 connection points 53, the transverse pipes 51 of the two sets of heat conduction pipe sets 5 penetrate through the middle of the support block 2 and are connected correspondingly one by one, wherein, the upper and lower sides of the connection points 53 located at the 4 vertices are respectively provided with a set of auxiliary heat conduction pipes 6, the connection points 53 located at the middle are provided with a set of vacuum heat conduction balls 7, the upper and lower ends of the other 4 connection points 53 are respectively connected with the upper and lower spiral hollow pipes 4 through a set of connecting rods 54, the spiral hollow pipes 4 are filled with quartz sand grains with a grain size of 200 and 240 meshes, the auxiliary heat conduction pipes 6 are filled with quartz with a grain size of 130 and 160 meshes, the vacuum sand grain heat conduction balls 7 are arranged in a hollow manner, 8 groups of hot melting grooves 71 are formed in the peripheral direction of the outer wall of the vacuum heat conducting ball 7;

as shown in fig. 2 and 6, the end of the auxiliary heat pipe 6 extends to the surface of the firebrick body 1 and is provided with a first heat conduction sheet 61 for promoting heat transfer between bricks, the ends of the transverse pipe 51 and the longitudinal pipe 52 both extend to the surface of the firebrick body 1 and are provided with a second heat conduction sheet 55, the heat absorbing plate 3 and the first and second

heat conduction sheets

61 and 55 are made of silicon carbide material, the heat absorbing plate 3 and the first and second

heat conduction sheets

61 and 55 have a lower specific heat capacity than the firebrick body 1, the heat absorbing plate 3 is made of silicon carbide material, the first and second

heat conduction sheets

61 and 55 are made of ceramic material, and the spiral hollow pipe 4, the heat conduction pipe group 5 and the auxiliary heat pipe 6 are made of 60W25Ni15Cr alloy.

The manufacturing method of the ceramic high-abrasion-resistance sealing refractory brick comprises the following steps:

s1 building a skeleton: placing a supporting block 2 in a designated mould, and building a spiral hollow pipe 4, a heat conduction pipe set 5 and an auxiliary heat conduction pipe 6 at corresponding positions;

s2 precast refractory brick body 1: premixing raw materials of a refractory brick body 1 according to a component ratio, firstly controlling the stirring speed at 80r/min and stirring for 5min, then increasing the stirring speed to 135r/min and continuing stirring for 15min, then injecting water with the total mass of 28% of the raw materials, maintaining the stirring speed and continuing stirring for 0.5h to obtain mixed slurry, simultaneously preparing a foaming agent with the total mass of 0.3% of the raw materials into stable foam liquid, and mixing the foaming agent, the poly hydroxy acid water reducing agent, the triethylene glycol shrinkage reducing agent, the polypropylene fiber, the floating bead and the water in a mass ratio of 1: 0.2: 0.3: 0.05: 2.5: 16, weighing and proportioning, foaming by using a high-pressure foaming machine, wherein the foaming agent is a sodium dodecyl sulfate foaming agent, mixing the mixed slurry with the foam liquid, continuously stirring for 0.85h, injecting into a mold, stirring at the speed of 200r/min for 60s, removing large bubbles by vibration, performing ultrasonic vibration for vibration, drying at 35 ℃ for 1-2h, and preheating at 125 ℃ for 26h to obtain a green body;

s3 calcining the firebrick body 1: placing the heat absorbing plate 3 and the first and second

heat conducting sheets

61 and 55 prepared in advance at the corresponding reserved positions of the green body, and placing the green body at the temperature of 1425 ℃ for high-temperature calcination for 2.5h to obtain refractory bricks;

s4 steam curing: putting the refractory bricks into a steam furnace, controlling the temperature at 87 ℃, and curing the surfaces of the refractory bricks by using hot steam for 24 hours.

Example 2

This embodiment is substantially the same as embodiment 1, except that: the refractory brick body 1 has different composition ratios.

The ceramic high-wear-resistance sealing refractory brick for the ceramic heat exchanger comprises a refractory brick body 1, wherein the refractory brick body 1 comprises the following components in percentage by mass: 50% of alumina, 24% of mullite fine powder, 6% of a binding agent, 10% of fused magnesia powder and the balance clay, wherein the binding agent is rho-Al₂O₃A binding agent.

Example 3

The ceramic high-wear-resistance sealing refractory brick for the ceramic heat exchanger comprises a refractory brick body 1, wherein the refractory brick body 1 comprises the following components in percentage by mass: alumina oxide55 percent of mullite fine powder, 26 percent of bonding agent, 3 percent of fused magnesia powder, and the balance of clay, wherein the bonding agent is rho-Al₂O₃A binding agent.

Example 4

This embodiment is substantially the same as embodiment 1, except that: the quality of the water injected in step S2 is different.

S2 precast refractory brick body 1: premixing raw materials of a refractory brick body 1 according to the component ratio, firstly controlling the stirring speed at 80r/min and stirring for 5min, then increasing the stirring speed to 120-150r/min and continuing stirring for 15min, then injecting water accounting for 25% of the total mass of the raw materials and maintaining the stirring speed to continue mixing and stirring for 0.5h to obtain mixed slurry, simultaneously preparing a foaming agent accounting for 0.3% of the total mass of the raw materials into stable foam liquid, and mixing the foaming agent, the poly hydroxy acid water reducing agent, the triethylene glycol shrinkage reducing agent, the polypropylene fibers, the floating beads and the water according to the mass ratio of 1: 0.2: 0.3: 0.05: 2.5: 16, weighing, proportioning, foaming by using a high-pressure foaming machine, mixing the mixed slurry with a foam liquid, continuously stirring for 0.85h, injecting into a mold, stirring at the speed of 200r/min for 60s, shaking to remove large bubbles, carrying out ultrasonic shaking for shaking, drying at 35 ℃ for 1-2h, and preheating at 125 ℃ for 26h to obtain a green body.

Example 5

S2 precast refractory brick body 1: premixing raw materials of a refractory brick body 1 according to the component ratio, firstly controlling the stirring speed at 80r/min and stirring for 5min, then increasing the stirring speed to 120-150r/min and continuing stirring for 15min, then injecting water accounting for 30% of the total mass of the raw materials and maintaining the stirring speed to continue mixing and stirring for 0.5h to obtain mixed slurry, simultaneously preparing a foaming agent accounting for 0.3% of the total mass of the raw materials into stable foam liquid, and mixing the foaming agent, the poly hydroxy acid water reducing agent, the triethylene glycol shrinkage reducing agent, the polypropylene fibers, the floating beads and the water according to the mass ratio of 1: 0.2: 0.3: 0.05: 2.5: 16, weighing, proportioning, foaming by using a high-pressure foaming machine, mixing the mixed slurry with a foam liquid, continuously stirring for 0.85h, injecting into a mold, stirring at the speed of 200r/min for 60s, shaking to remove large bubbles, carrying out ultrasonic shaking for shaking, drying at 35 ℃ for 1-2h, and preheating at 125 ℃ for 26h to obtain a green body.

Example 6

This embodiment is substantially the same as embodiment 1, except that: the parameters for prefabricating the firebrick body in step S2 are different.

S2 precast refractory brick body 1: premixing raw materials of a refractory brick body 1 according to a component ratio, firstly controlling the stirring speed at 80r/min, stirring for 5min, then increasing the stirring speed to 120r/min, continuously stirring for 15min, then injecting water with the total mass of 28% of the raw materials, maintaining the stirring speed, continuously mixing and stirring for 0.5h to obtain mixed slurry, simultaneously preparing a foaming agent with the total mass of 0.3% of the raw materials into stable foam liquid, and mixing the foaming agent, the poly hydroxy acid water reducing agent, the triethylene glycol shrinkage reducing agent, the polypropylene fiber, the floating bead and the water according to a mass ratio of 1: 0.2: 0.3: 0.05: 2.5: 16, weighing and proportioning, foaming by using a high-pressure foaming machine, wherein the foaming agent is a sodium dodecyl sulfate foaming agent, mixing the mixed slurry with the foam liquid, continuously stirring for 0.85h, injecting into a mold, stirring at the speed of 200r/min for 60s, removing large bubbles by vibration, performing ultrasonic vibration for vibration, drying at 35 ℃ for 1-2h, and preheating at 120 ℃ for 24h to obtain a green body;

example 7

S2 precast refractory brick body 1: premixing raw materials of a refractory brick body 1 according to a component ratio, firstly controlling the stirring speed at 80r/min, stirring for 5min, then increasing the stirring speed to 150r/min, continuously stirring for 15min, then injecting water with the total mass of 28% of the raw materials, maintaining the stirring speed, continuously mixing and stirring for 0.5h to obtain mixed slurry, simultaneously preparing a foaming agent with the total mass of 0.3% of the raw materials into stable foam liquid, and mixing the foaming agent, the poly hydroxy acid water reducing agent, the triethylene glycol shrinkage reducing agent, the polypropylene fiber, the floating bead and the water according to a mass ratio of 1: 0.2: 0.3: 0.05: 2.5: 16, weighing and proportioning, foaming by using a high-pressure foaming machine, wherein the foaming agent is a sodium dodecyl sulfate foaming agent, mixing the mixed slurry with the foam liquid, continuously stirring for 0.85h, injecting into a mold, stirring at the speed of 200r/min for 60s, removing large bubbles by vibration, performing ultrasonic vibration for vibration, drying at 35 ℃ for 1-2h, and preheating at 130 ℃ for 30h to obtain a green body;

example 8

This embodiment is substantially the same as embodiment 1, except that: the firing parameters for firing the firebrick body in step S3 are different.

S3 calcining the firebrick body 1: and (3) putting the heat absorbing plate 3 and the first and second

heat conducting sheets

61 and 55 which are prepared in advance into the corresponding reserved positions of the green body, and calcining the green body at 1420 ℃ for 2 hours to obtain the refractory brick.

Example 9

heat conducting sheets

61 and 55 which are prepared in advance into the corresponding reserved positions of the green body, and calcining the green body at 1430 ℃ for 3h to obtain the refractory brick.

Example 10

This embodiment is substantially the same as embodiment 1, except that: the steam curing parameters of step S4 are different.

S4 steam curing: the refractory bricks are placed in a steam furnace, the temperature is controlled at 85 ℃, and hot steam is used for curing the surfaces of the refractory bricks for 24 hours.

Example 11

S4 steam curing: the refractory bricks are placed in a steam furnace, the temperature is controlled at 90 ℃, and hot steam is used for curing the surfaces of the refractory bricks for 24 hours.

The working principle of the refractory bricks in examples 1 to 11 in use was as follows:

when the ceramic heat exchanger is heated, the heat is absorbed by the heat absorbing plate 3 and is transferred to the spiral hollow tube 4 by the heat transfer rod 31, the heat is gradually transferred to the middle part of the refractory brick in a spiral mode from the quartz sand grains in the spiral hollow tube 4 and is transferred to the heat conducting tube group 5 by the connecting rod 54, the fine quartz sand grains in the spiral hollow tube 4 can slow down the transfer speed, a certain heat preservation effect is achieved on the ceramic heat exchanger, and the refractory brick is prevented from being broken due to too fast heating; meanwhile, the vacuum heat conducting balls 7 can further store heat and delay heat transfer, when heat enters the transverse pipe 51 and the longitudinal pipe 52, the heat is transferred through the coarse quartz sand grains, the transfer speed is accelerated, the heat transfer among the refractory bricks is enhanced, and an effective temperature control system is formed inside the refractory bricks.

Examples of the experiments

The refractoriness under load of the refractory bricks of examples 1 to 3 was first tested to determine the optimum composition ratio, and the results of the refractoriness under load at 0.5% deformation under a pressure of 0.05MPa as measured in accordance with GB/T5989-.

TABLE 1 refractoriness under load of refractory bricks in examples 1 to 3

Examples	Refractoriness under load (DEG C)
		Example 1	1680
Example 2	1635
		Example 3	1662

It can be seen that the refractory brick of example 1 has the best performance, the component ratio should be controlled within a reasonable range, and rho-Al₂O₃The bonding agent is used as active alumina and is easy to be converted into alpha-Al at higher temperature₂O₃And alpha-Al₂O₃Since sintering is difficult and the high temperature performance of the refractory bricks is deteriorated, the amount of addition is not so high.

The compressive strength of the refractory bricks of examples 1, 4 and 5 were then tested to determine the optimum amount of water to be incorporated, as determined in accordance with GB/T5072-.

TABLE 2 compressive Strength of refractory bricks in examples 1, 4 and 5

Examples	Compressive strength MPa
		Example 1	37.5
Example 4	31.8
		Example 5	36.4

It can be seen that the compressive strength of the refractory brick of example 1 is the best, and the compressive strength tends to increase and decrease with the increase of the amount of water, so the amount of water doping in example 1 is the most reasonable.

The stirring speed and the calcination temperature used in examples 1, 6-9 enable the performance parameters of the refractory bricks to be prepared at a high level.

The compressive strength of the refractory bricks of examples 1, 10 and 11 were tested to determine the optimum steam curing temperature and compared to refractory bricks not cured with steam, and the results are shown in table 3.

TABLE 3 compressive Strength of refractory bricks in examples 1, 4 and 5

Examples	Compressive strength MPa
		Example 1	37.5
Example 10	37.4
		Example 11	37.8
Comparative example	36.9

It can be seen from this that the strength of the refractory bricks can be maintained at a high level after curing with steam.

Claims

1. A ceramic high-wear-resistance sealed refractory brick for a ceramic heat exchanger is characterized by comprising a refractory brick body (1), wherein a supporting block (2) is arranged in the middle of the refractory brick body (1), grooves (21) are symmetrically arranged at the upper part and the lower part of the supporting block (2), two groups of heat absorbing plates (3) for absorbing heat are arranged on the upper surface and the lower surface of the refractory brick body (1), the two groups of heat absorbing plates (3) on the same side surface are symmetrical relative to the supporting block (2), a group of heat transfer rods (31) are arranged at one side of the center of each heat absorbing plate (3) facing the inside of the refractory brick body (1), spiral hollow tubes (4) are arranged at the tail ends of the heat transfer rods (31), the spiral hollow tubes (4) extend to the middle of the refractory brick body (1) from the tail ends of the heat transfer rods (31), the radius of the spiral hollow tubes (4) is gradually increased, and the upper and the lower groups of spiral hollow tubes (4) are symmetrically arranged, a heat conduction pipe set (5) is arranged between the upper and lower groups of spiral hollow pipes (4);

the heat conduction pipe set (5) comprises 3 groups of transverse pipes (51) arranged at equal intervals and 3 groups of longitudinal pipes (52) arranged at equal intervals, the transverse pipes (51) and the longitudinal pipes (52) are located on the same horizontal plane and are arranged in a staggered welding mode, 9 connection points (53) are arranged on the transverse pipes (51) and the longitudinal pipes (52) in total, a group of auxiliary heat conduction pipes (6) are arranged on the upper side and the lower side of each connection point (53) located at 4 vertex points, a group of vacuum heat conduction balls (7) are arranged at the connection points (53) located at the middle portion, and the upper end and the lower end of each of the rest 4 connection points (53) are correspondingly connected with the upper spiral hollow pipe (4) and the lower spiral hollow pipe (4) through a group of connecting rods (54).

2. The ceramic high-abrasion-resistance sealing refractory brick for the ceramic heat exchanger as claimed in claim 1, wherein the transverse tubes (51) of the two heat conduction tube sets (5) are correspondingly connected after penetrating through the middle part of the supporting block (2).

3. The ceramic high abrasion resistant sealed refractory brick for the ceramic heat exchanger according to claim 1, wherein the ends of the auxiliary heat conductive pipes (6) extend to the surface of the refractory brick body (1) and are provided with first heat conductive fins (61) for promoting heat transfer between bricks, and the ends of the transverse pipes (51) and the longitudinal pipes (52) extend to the surface of the refractory brick body (1) and are provided with second heat conductive fins (55).

4. The ceramic high-wear-resistance sealed refractory brick for the ceramic heat exchanger as claimed in claim 1, wherein the refractory brick body (1) comprises the following components in percentage by mass: oxygen gas50-55% of aluminum oxide, 24-26% of mullite fine powder and rho-Al₂O₃3-6% of a binding agent, 8-10% of fused magnesia powder and the balance clay.

5. The ceramic high-wear-resistance sealed refractory brick for the ceramic heat exchanger as claimed in claim 1, wherein the spiral hollow tube (4) is filled with quartz sand particles with the particle size of 200-240 meshes, and the auxiliary heat conduction tube (6) is filled with quartz sand particles with the particle size of 130-160 meshes.

6. The ceramic high-abrasion-resistance sealed refractory brick for the ceramic heat exchanger according to claim 1, characterized in that the vacuum heat-conducting ball (7) is arranged in a hollow manner, and a plurality of hot melting grooves (71) are formed in the circumferential direction of the outer wall of the vacuum heat-conducting ball (7).

7. The ceramic high-wear-resistance sealed refractory brick for the ceramic heat exchanger according to claim 1, wherein the supporting block (2) is made of spinel, the heat absorbing plate (3) and the first and second heat conducting fins (61, 55) are made of silicon carbide material, the heat absorbing plate (3) and the first and second heat conducting fins (61, 55) have specific heat capacities lower than that of the refractory brick body (1), and the spiral hollow tube (4), the heat conducting tube set (5) and the auxiliary heat conducting tube (6) are all made of 60W25Ni15Cr alloy.

8. The method for manufacturing the ceramic high abrasion resistant sealed refractory brick according to any one of claims 1 to 7, comprising the steps of:

s1 building a skeleton: placing a supporting block (2) in a designated die, and building a spiral hollow pipe (4), a heat pipe group (5) and an auxiliary heat pipe (6) at corresponding positions;

s2 precast refractory brick body (1): premixing raw materials of a refractory brick body (1) according to the component ratio, then injecting water accounting for 25-30% of the total mass of the raw materials, continuously mixing and stirring for 0.5h to obtain mixed slurry, simultaneously preparing foaming agent accounting for 0.3% of the total mass of the raw materials into stable foam liquid, mixing the mixed slurry and the foam liquid, continuously stirring for 0.85h, injecting into a mold, vibrating to remove large bubbles, drying at 35 ℃ for 1-2h, and preheating at 120-130 ℃ under vacuum condition for 24-30h to obtain a green body;

s3 calcining the firebrick body (1): placing a heat absorbing plate (3) and first and second heat conducting fins (61, 55) which are prepared in advance at a corresponding reserved position of the green body, and calcining the green body at 1420-1430 ℃ for 2-3h to obtain a refractory brick;

9. The method as claimed in claim 8, wherein the premixing step S2 is performed by controlling the stirring speed at 80r/min and stirring for 5min, increasing the stirring speed to 120-: 0.2: 0.3: 0.05: 2.5: 16, weighing, proportioning, foaming by using a high-pressure foaming machine, wherein the foaming agent is a sodium dodecyl sulfate foaming agent, the stirring speed after injecting the foaming liquid is 200r/min, the stirring time is 60s, and ultrasonic vibration is used for vibration.