JP2010190518A - Reaction chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaction chamber suppressing peeling of a refractory lining. <P>SOLUTION: In this reaction chamber, a side wall 5 is formed by connecting a plurality of water wall tubes 51 by fins 53, and has an upper water wall part 5a disposed in an upper region of the reaction chamber and substantially having vertical attitude, a lower wall part 5c disposed at a lower region of the reaction chamber and provided with the refractory lining 55, and an intermediate water wall part 5b disposed between the upper water wall part 5a and the lower wall part 5c provided with the refractory lining 55, and the water wall tube 51 of at least a part of the intermediate water wall part 5b is bent obliquely in relation to a vertical face toward a lower part and an outer part, and a top end face 21 of the refractory lining 55 is a horizontal face. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reaction chamber of a fluidized bed reactor.

  Conventionally, a reaction chamber described in Patent Document 1 below is known as a technique in such a field. In this reaction chamber, a large number of water wall tubes extending in the vertical direction are arranged, and the water wall tubes are joined together by fins forming a flat plate shape, thereby forming a wall that partitions the reaction chamber. Yes. The upper part of the wall has a substantially vertical posture, and the middle part of the wall is bent downward and outward obliquely with respect to the vertical plane. And the refractory material lining is given to the inner side of the lower part of the wall following the bent part, and the inner surface of the refractory material lining is provided so as to be located in the same vertical plane as the fins in the upper part of the wall. With this configuration, it has been proposed that when the reaction particles in the reaction chamber descend along the wall, the reaction particles are continuously lowered without causing a change in direction to suppress erosion of the wall by the reaction particles.

JP-T-4-503243

  However, in this configuration, the refractory material lining has a shape that gradually becomes thinner as it goes upward as the wall bends. It is also difficult to embed an anti-separation anchor in the thin part of the upper end of such a refractory material lining. As a result, the reaction particles flowing along the walls in the reaction chamber may rub against and collide with the upper end of the refractory material lining, so that the thin upper end portion of the refractory material lining may be peeled off and lost. When the defect of the refractory material lining occurs, the reaction particles flowing near the wall are likely to accumulate in the defect part, and as a result, the water wall tube may come into contact with the reaction particles and be damaged.

  Then, an object of this invention is to provide the reaction chamber which can suppress peeling of a refractory material lining.

  The reaction chamber of the present invention is a reaction chamber of a fluidized bed reactor having a lattice body at the bottom of the reaction chamber and a wall that partitions the reaction chamber in the horizontal direction. An upper water wall portion which is formed by joining wall tubes and is substantially vertical in the upper region of the reaction chamber; and a lower wall portion with a refractory material lining in the lower region of the reaction chamber; An intermediate water wall portion between the upper water wall portion and the refractory material-lined lower wall portion, wherein at least a portion of the water wall in the intermediate water wall portion is The upper end face of the refractory material lining is a horizontal plane, and is bent downward and outward.

  In this reaction chamber, even when the reaction particles descending along the upper water wall collide with the upper end surface of the refractory material lining, the upper end surface of the refractory material lining is horizontal, Particle collision is unlikely to act as a force to peel off the refractory lining. Also, if the upper end surface of the refractory material lining is a horizontal surface, it is easy to ensure the thickness of the refractory material lining at the upper end portion, and the refractory material lining is peeled off due to friction and collision of reactive particles by ensuring the thickness of the upper end portion. Can be difficult.

  Moreover, it is preferable that a refractory material lining has the inclined surface formed so that it might be located inside the upper end surface, and might fall toward the inner side. According to this configuration, when the reaction particles descending along the upper water wall portion collide with the inclined surface, the reaction particles bounce away from the wall toward the inside of the reaction chamber. Accordingly, the reaction particles after rebounding are unlikely to contact the wall again, and as a result, damage to the refractory material lining and the water wall tube can be suppressed.

  Moreover, it is preferable that the upper end surface of a refractory material lining is located outside the virtual vertical surface along the fin in the upper water wall portion. In this case, since the upper end surface is located on the back side when viewed from the inside of the reaction chamber with respect to the upper water wall portion, the reaction particles descending along the upper water wall portion are moved to the upper end surface of the refractory material lining. It becomes difficult to collide with. Therefore, peeling of the refractory material lining can be further suppressed.

  According to the reaction chamber of the present invention, peeling of the refractory material lining can be suppressed.

It is sectional drawing which shows 1st Embodiment of the reaction chamber which concerns on this invention. It is a front view which shows the shape which looked at the upper end part vicinity of the refractory material lining of the reaction chamber shown in FIG. 1 from the said reaction chamber inner side. It is sectional drawing which shows the shape which looked at the upper end part vicinity of the refractory material lining shown in FIG. 2 from the side. It is sectional drawing which shows the shape which looked at the upper end part vicinity of the refractory material lining from the side in 2nd Embodiment of the reaction chamber which concerns on this invention.

  Hereinafter, preferred embodiments of a reaction chamber according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
As shown in FIGS. 1 to 3, the combustion chamber (reaction chamber) 1 of the fluidized bed reactor includes a lattice plate 3 provided horizontally at the bottom and side walls 5 that partition the combustion chamber 1 in the horizontal direction. I have. The side wall 5 includes a large number of water wall tubes 51 that extend in the vertical direction and distribute water, and a large number of flat plate-shaped (plate-shaped) fins 53 that connect adjacent water wall tubes 51. The side wall 5 is formed by alternately arranging and connecting a large number of water wall tubes 51 and a large number of fins 53. Further, the side wall 5 is provided with a refractory material lining 55 provided on the inner wall side so as to cover the water wall tube 51 and the fins 53 in the lower part.

  Air is introduced into the combustion chamber 1 from the air chamber 7 below the combustion chamber 1 through the nozzle 4, and the reaction particles in the combustion chamber 1 flow with the air. When a gas other than air is used to fluidize the reaction particles in the combustion chamber, the gas for fluidization is introduced through another inlet (not shown). Further, fuel for combustion, additives, other particulate materials, and secondary gas may be introduced into the combustion furnace 1 through another inlet (not shown).

  The side wall 5 is composed of a water wall tube 51 and fins 53, has a substantially vertical posture, and has an upper water wall portion 5 a that partitions the upper region 1 a of the combustion chamber 1 in the horizontal direction. Further, the side wall 5 is provided with the refractory material lining 55 described above, and has a lower wall portion 5 c that partitions the lower region 1 c of the combustion chamber 1 in the horizontal direction. Further, the side wall 5 has an intermediate water wall portion 5b that is between the upper water wall portion 5a and the lower wall portion 5c and divides the intermediate portion region 1b of the combustion chamber 1 in the horizontal direction. The ratio of the height of the lower wall portion 5c to the vertical height of the entire side wall 5 is usually in the range of 1:10 to 1: 3.

  As shown in FIGS. 2 and 3, the side wall 5 is bent at an angle α downward and outward at a bending position 13 of the intermediate water wall portion 5b. In the state shown in FIG. 3, the left side of the side wall 5 is the inside of the combustion chamber 1, and the right side of the side wall 5 is the outside of the combustion chamber 1. The angle α can be set to 5 to 30 °, and in many cases, the bending effect as described later can be sufficiently obtained by setting the angle α to 10 to 20 °. Further, at the re-bending position 15 from the intermediate water wall portion 5b to the lower wall portion 5c, the side wall 5 is bent at an angle α in a direction opposite to the bending direction at the bending position 13 so as to extend downward vertically again. Has been. Accordingly, at least the upper portion of the lower wall portion 5c extends substantially in the vertical direction.

  In the lower wall portion 5c, the upper end surface 21 of the refractory material lining 55 is formed as a horizontal plane. Further, an inclined surface 23 is formed at the upper end portion of the refractory material lining 55 and continues obliquely below the upper end surface 21. The inclined surface 23 extends at an angle of about 45 ° so as to descend from the ridge line 21 a at the tip of the upper end surface 21 toward the inside of the combustion chamber 1. Furthermore, the refractory material lining 55 has an inner wall surface 25 extending downward in parallel along the water wall tube 51 and the fins 53 from the lower end of the inclined surface 23.

  Assuming that a virtual vertical plane along the fins 53 in the upper water wall portion 5a is a vertical plane A as shown in the drawing, the upper end surface 21 is outside the vertical plane A (that is, the back side when viewed from the inside of the combustion chamber 1). Is located. That is, the ridge line 21 a at the tip of the upper end surface 21 is located outside the vertical plane A. Further, when a virtual vertical surface that is in contact with the outer peripheral surface of each water wall tube 51 in the lower wall portion 5c from the inside of the reactor 1 is a vertical surface B as shown in the figure, the ridge line 21a of the upper end surface 21 is a vertical surface. It is located inside B (that is, the front side as viewed from the inside of the combustion chamber 1). By securing a certain distance between the ridge line 21a and the vertical plane B, it is possible to secure the thickness of the portion of the upper end portion of the fireproof lining 55 that adheres to the water wall tube 51.

  According to the combustion chamber 1 as described above, since the upper end surface 21 of the refractory material lining 55 is a horizontal surface, the reaction particles descending along the upper water wall portion 5 a are moved to the upper end surface of the refractory material lining 55. Even in the case of a collision with the refractory 21, this collision force is unlikely to act as a force for peeling the refractory material lining 55.

  Further, since the upper end surface 21 of the refractory material lining 55 is a horizontal plane, it is easy to ensure the thickness of the refractory material lining 55 at the upper end portion, and the separation of the reaction particles due to friction and collision occurs by ensuring the thickness of the upper end portion. Can be difficult. Furthermore, by securing the thickness of the upper end portion of the refractory material lining 55, it becomes possible to provide an anchor on the surface of the water wall tube 51 or the fin 53 to strengthen the fixing force of the upper end portion of the refractory material lining 55. It can also be made difficult to peel. In addition, since the inclined surface 23 is formed as a chamfer at the corner portion between the upper end surface 21 and the inner wall surface 25, damage to the upper end corner portion of the refractory material lining 55 can be suppressed. In addition, even when the reaction particles descending along the upper water wall portion 5 a collide with the inclined surface 23, the reaction particles rebound in the direction away from the side wall 5 toward the inside of the combustion chamber 1. Therefore, the reaction particles after rebounding are unlikely to contact the side wall 5 again, and as a result, damage to the refractory material lining 55 and the water wall tube 51 can be suppressed.

  Furthermore, since the side wall 5 is bent downward and outward at the bending position 13 and the upper end surface 21 is located outside the vertical surface A, the fins 53 of the upper water wall portion 5a (that is, the vertical surface). Reacting particles descending (along A) do not easily collide with the upper end surface 21. Therefore, peeling of the refractory material lining 55 can be further suppressed. From the viewpoint of producing such an effect, it is preferable to reduce the distance in the height direction from the bending position 13 to the upper end surface 21, and to increase the distance in the horizontal direction from the vertical surface A to the ridge line 21a. It is preferable. And in order to implement | achieve such a structure, it is preferable to provide the upper end surface 21 of the refractory material lining 55 in the height of the rebending position 15. FIG.

  In consideration of the case where the refractory material lining 55 is formed while being joined in the vertical direction, the upper end portion of the refractory material lining 55 is configured so that a joining surface having a relatively low strength does not appear in the vicinity of the upper end surface 21. It is also preferable from the viewpoint of suppressing the peeling.

(Second Embodiment)
Subsequently, as shown in FIG. 4, the refractory material lining 155 in the combustion chamber 101 has the upper end surface 121 as a horizontal plane. The inner wall surface 125 of the refractory material lining 155 extends vertically downward from the ridgeline 121a at the tip of the upper end surface 121. A chamfered portion is not formed between the upper end surface 121 and the inner wall surface 125. In addition, in this combustion chamber 101, the same code | symbol is attached | subjected about the component same or equivalent to the above-mentioned combustion chamber 1, and the overlapping description is abbreviate | omitted.

  Also in the combustion chamber 101 as described above, the upper end surface 121 of the refractory material lining 155 is a horizontal surface, and therefore, the reaction particles descending along the upper water wall portion 5a are reflected on the upper end surface 121 of the refractory material lining 155. This collision force is unlikely to act as a force for peeling the refractory material lining 155.

  Moreover, since the upper end surface 121 of the refractory material lining 155 is a horizontal surface, it is easy to ensure the thickness of the refractory material lining 155 at the upper end portion, and the separation of the reaction particles due to friction and collision occurs by ensuring the thickness of the upper end portion. Can be difficult. Furthermore, by securing the thickness of the upper end portion of the refractory material lining 155, an anchor can be provided on the surface of the water wall tube 51 or the fin 53 to enhance the fixing force of the upper end portion of the refractory material lining 155. It can also be made difficult to peel.

  The present invention is not limited to the embodiment described above. For example, in the first embodiment, the ridge line 21 a of the upper end surface 21 may be provided at a position outside the vertical plane B. In this case, the upper end surface 21 of the refractory material lining is constituted by a number of intermittent horizontal surfaces that appear in each region sandwiched between adjacent water wall tubes 51. In the first and second embodiments described above, as shown in FIGS. 3 and 4, the inner wall surfaces 25 and 125 of the refractory material linings 55 and 155 are located on the inner side of the vertical surface A. The inner wall surfaces 25 and 125 may be positioned on the vertical plane A. In this case, the reaction particles descending along the fins 53 of the upper water wall portion 5a (that is, along the vertical surface A) are applied to the inner wall surfaces 25 and 125 of the refractory linings 55 and 155 without changing the direction. Therefore, the number of reactive particles that collide with the upper end surfaces 21 and 121 is further reduced.

  DESCRIPTION OF SYMBOLS 1,101 ... Combustion chamber (reaction chamber), 1a ... Upper region of combustion chamber, 1c ... Lower region of combustion chamber, 3 ... Lattice plate (grid body), 5 ... Side wall, 5a ... Upper water wall portion, 5b ... Middle Water wall portion, 5c ... lower wall portion, 21, 121 ... upper end surface, 23 ... inclined surface, 51 ... water wall tube, 53 ... fin (flat plate), 55, 155 ... refractory material lining, A ... virtual vertical surface.

Claims (3)

A reaction chamber of a fluidized bed reactor having a lattice body at the bottom of the reaction chamber and walls that partition the reaction chamber in the horizontal direction,
This wall
An upper water wall portion that is formed by joining a plurality of water wall tubes by fins or flat plates, and is in a substantially vertical position in the upper region of the reaction chamber;
A lower wall portion with a refractory material lining in the lower region of the reaction chamber;
An intermediate water wall portion between the upper water wall portion and the lower wall portion with the refractory material lining;
At least a part of the water wall in the intermediate water wall part is bent downward and outward obliquely with respect to the vertical plane,
The reaction chamber, wherein an upper end surface of the refractory material lining is a horizontal surface. The refractory lining is
2. The reaction chamber according to claim 1, further comprising an inclined surface which is located inside the upper end surface and is formed so as to descend toward the inside. The upper end surface of the refractory material lining is
The reaction chamber according to claim 1 or 2, wherein the reaction chamber is located outside a virtual vertical plane along the fin in the upper water wall portion.

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