JP2783864B2 - Direct-fired high-temperature regenerator - Google Patents

Description

The present invention relates to a direct-fired high-temperature regenerator in which a water tube group is provided in a furnace tube.

(B) Conventional technology For example, in Japanese Patent Application Laid-Open No. 58-173360, a group of solution tubes is disposed substantially vertically in a furnace tube, and the absorption liquid in the solution tube is heated by combustion gas of a burner to generate refrigerant vapor. A direct-fired high temperature regenerator to be generated is disclosed. In the above-mentioned direct-fired high-temperature regenerator, by arranging the water pipes in a staggered manner, the effect of promoting the turbulence of the combustion gas can be obtained, so that the pressure in the furnace can generally be kept low.

(C) Problems to be solved by the invention In the above-mentioned conventional technology, when the burner is burned for a long time, unburned substances such as soot and sulfur adhere to the surface of the water pipe, and the heat transfer performance is reduced. descend. And, for example, removing the burner and spraying chemicals to the water tube group to remove unburned substances, but since the water tube arrangement is staggered, it is difficult for the chemical to reach the center of the water tube group In addition, there has been a problem that the deposits of unburned matter separated from the water tube group cannot be completely removed. In addition, since the water tube group is arranged at the back of the burner, the depth of the high-temperature regenerator becomes longer, and the proportion of the installation space of the high-temperature regenerator in the absorption refrigerator becomes larger, and as a result, the entire machine becomes larger. The problem had occurred.

An object of the present invention is to simplify the cleaning operation of the high-temperature regenerator and to make the high-temperature regenerator compact without impairing the heat transfer performance.

(D) Means for Solving the Problems In order to solve the above problems, the present invention provides a water pipe group (11A) to which an absorbent is supplied in a furnace tube (2), and a water pipe (11) ...
A water wall (4) is formed around a furnace tube (2) in a direct-fired high-temperature regenerator that generates refrigerant vapor by heating an absorbing solution in a furnace by a burner (13), and an upstream side of a water tube group (11A) is formed. Provided is a direct-fired high-temperature regenerator (1) provided in a furnace tube at an angle so as to be low and high on the downstream side, and a burner (13) provided below the furnace tube (2) on the upstream side of the water tube group (11A). Is what you do.

(E) Operation When the direct-fired high-temperature regenerator (1) is operated in conjunction with the operation of the absorption refrigerator, the water pipe group (11A) is heated by the combustion gas from the burner (13), and the water pipe group (11A) is heated. The refrigerant vapor is generated at this time, and the refrigerant vapor flows from the upstream side to the downstream side in the water pipe (11) due to the inclination of the water pipe group (11A), and accordingly, the absorbing liquid in the water pipe (11) also flows downstream. Flows upstream from
Refrigerant vapor and absorption liquid stay in the water pipe group (11A), and local overheating of the water pipe group (11A) and excessive concentration of the absorption liquid can be avoided. Further, the vertical arrangement of the water pipe group (11A) and the burner (13) makes it possible to reduce the size of the direct-fired high-temperature regenerator (1). Furthermore, when cleaning the water pipe group (11A), the cleaning agent sprayed from above onto the water pipe group (11A) flows down to the lower water pipe, and spreads over almost the entire water pipe group (11A), and the entire water pipe group (11A). It becomes possible to remove the unburned matter.

Refrigerant vapor generated in the water tube group (11A) provided at the upper part of the furnace tube (2) is moved upward in each water tube of the water tube group (11A), and the absorbing liquid is moved accordingly, It is possible to avoid local overheating of the refrigerant vapor and overconcentration of the absorbing liquid, and the cleaning agent sprayed from above during cleaning of the water pipe group moves to the lower part of the water pipe group, and spreads over almost the entirety, and does not spread. It is possible to completely and easily perform the work of removing the combustibles.

Further, a direct-fired high-temperature regenerator (1) is provided by a burner (13) provided below the furnace tube (2) on the upstream side of the water tube group (11A).
During the operation, the temperature of the absorbent on the water wall (4) facing the burner (13) rises, and a large amount of refrigerant vapor moves upward along the water wall (4) and flows out of the water pipe group (11A). The refrigerant vapor flows out of the high-temperature regenerator (1) together with the refrigerant vapor, and the refrigerant vapor can be prevented from remaining in the high-temperature regenerator (1).

(F) Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(1) is a direct-fired high-temperature regenerator of an absorption refrigerator, and (2)
Is a furnace tube, and (3A) and (3B) are end plates. A water wall (4) is provided between the furnace tube (2) and the end plates (3A) and (3B). Further, a water wall (4) is provided between the furnace tube (2) and the outer wall (5), and the absorbing liquid is stored on the water wall (4). Further, an absorbing liquid inlet header (6) is attached to the end plate (3A), and an absorbing liquid pipe (7) is connected to the inlet header (6). An outlet header (8) for absorbing liquid and refrigerant is attached to the end plate (3B), and a feed pipe (10) for absorbing liquid and refrigerant is connected to the outlet header (8). (11A) is the combustion chamber (2
A group of water pipes passed above A). One end of each water pipe (11) is open in the inlet header (6), and the other end is open in the outlet header (8). Further, each water pipe (11) is inclined at an angle (θ) with the inlet header (6) side, that is, the upstream side being low, and the outlet header (8) side, that is, the downstream side being high. The lower water pipe (11) is the upper two-stage water pipe (11).
It is provided more densely.

(12) is an opening for mounting a burner provided through the furnace tube (2) below the inlet header (6) and the end plate (3A). For example, an oil burner (13) is inserted into the opening (12). Installed. Reference numeral (14) denotes a lid connected to the upper end of the furnace tube (2), and a combustion gas exhaust tube (15) is connected to this lid. Then, an exhaust pipe (not shown) is connected to the exhaust pipe (15).

In the high-temperature regenerator (1) configured as described above, the diluted absorption liquid flows from the absorber (not shown) to the inlet header (6) during the operation of the absorption refrigerator. Further, the oil burner (13) burns, and the rare absorbing liquid in each of the water pipes (11) is heated. The refrigerant vapor generated in the water pipes (11) moves in the inclined water pipes (11) to the outlet header (8) due to the density difference between the vapor and the absorbing liquid. In addition, the refrigerant vapor flows into the water pipe (11) ...
As the water moves toward the outlet header (8), the concentrated absorbent in each pipe is pushed out to the outlet header (8), and the diluted absorbent is supplied from the opening of the water pipe (11). Flows into each water pipe (11). Also, since the water wall (4) below the outlet header (8) is opposed to the burner (13), the rare absorbing liquid in the water wall (4) on the outlet side of the water pipes (11) ... is discharged from the burner (13). Heated by the flame. Then, a large amount of refrigerant vapor is separated from the rare absorbing liquid, and this refrigerant vapor moves upward, enters the outlet header (8), and exits the outlet header (8).
Move to the separator (not shown) above the outlet header (8) together with the refrigerant vapor and the absorbing liquid that have moved through the water pipes (11).

In the high-temperature regenerator (1) operated as described above,
When used for a long time, unburned substances such as sulfur and soot contained in the oil supplied to the burner (13) gradually adhere to the surface of each water pipe (11), and the heat exchange efficiency gradually decreases. For this reason, the inside of the furnace tube (2) is periodically cleaned by the manager at predetermined time intervals, for example. During this cleaning, the burner (13) and the lid (14) at the top of the furnace tube (2) are removed, and the cleaning liquid (chemical) is jet-sprayed from above the water tube group (11A) by a nozzle. Then, the cleaning liquid flows down sequentially from the uppermost water pipe (11) to the lower water pipe (11), and the cleaning liquid spreads to all the water pipes (11). Then, all the unburned matter separated from the surface of the water pipes (11) falls to the bottom of the furnace tube (2). Then the opening for the burner installation (12)
Unburned matter is discharged from outside.

When the cleaning operation is completed, the burner (13) is attached to the opening (12), and the lid (14) is attached to the furnace tube (2).
Attached to the upper end of

In the above embodiment, the water pipes (11) of the high temperature regenerator (1) are inclined so that the upstream side is lower and the downstream side is higher, so that the furnace tube (2)
During the operation of the high-temperature regenerator (1), the refrigerant vapor generated in the water pipes (11) moves to a higher upstream side gradually and is discharged into the outlet header (8). 11) can be prevented from accumulating in the inside, as a result, the heat transfer performance of the water pipe (11) can be prevented from lowering and local heating can be prevented.
Overconcentration due to accumulation of the absorbing solution can be avoided.

Also, when cleaning the high-temperature regenerator (1), the water pipe group (11A)
By jet spraying the cleaning liquid from above, the cleaning liquid flows down from the upper water pipe to the lower water pipe sequentially, so that the cleaning liquid can be spread evenly in all the water pipes (11) ... and the cleaning liquid can be used effectively. Unburned matter can be easily and reliably removed from the water pipe (11).

Further, since the water tube group (11A) is arranged at the upper part of the furnace tube (2), the depth (L) can be reduced to approximately half as compared with the conventional one, and the high temperature regenerator (1) is installed. Space can be reduced and the entire absorption refrigerator can be made more compact.

Further, since the burner (13) is attached from the upstream side to the downstream side of the water pipe group (11A), a large amount of refrigerant vapor generated on the water wall (4) facing the burner (13) is transferred to the water pipe (11A). )
… Can flow to the outlet header (8) without passing through, and the refrigerant vapor can be prevented from stagnating above the water wall (4),
Local overheating and overconcentration at the upper part of the water wall (4) can be avoided.

The present invention is not limited to the above embodiment,
For example, the absorbent pipe (7) may be connected to a lower portion of the end plate (8) facing the burner (13) as shown by a broken line in FIG. In the above embodiment, the lid (14) was removed for cleaning when cleaning the water tube group. For example, the lid (14) was provided with a cleaning opening (20) as shown in FIG. A detachable lid (21) is attached to the opening (20). When cleaning the water pipe group (11A), the lid (21) may be removed, a cleaning nozzle may be inserted through the opening (21), and the water pipes (11)... May be cleaned.

(G) Effect of the Invention The present invention is a direct-fired high-temperature regenerator configured as described above. The water tube group is disposed such that the furnace tube is inclined upward so that the upstream side is low and the downstream side is high, and the burner Is located in the lower part of the furnace tube, so that during operation of the high-temperature regenerator, the combustion of the burner causes the refrigerant vapor separated from the absorbent in the water tube to flow from the upstream side to the downstream side without stagnation in the tube. In addition, it is possible to prevent the heat transfer performance of the water pipe from deteriorating and to prevent local overheating, and to avoid excessive concentration of the absorbing solution. In addition, when cleaning the water pipes, the cleaning liquid flows from the upper water pipe to the lower water pipe by spraying the cleaning liquid onto the water pipe group from above, so that the cleaning agent spreads through all the water pipes and easily removes unburned matter adhering to each water pipe. And can be reliably removed. Further, the high-temperature regenerator can be made compact without impairing the heat transfer performance.

In addition, since the water tube group is arranged at the top of the furnace tube and the water tube group is attached at a certain angle to the horizontal,
Refrigerant vapor generated in the water pipes moves upward without accumulating in the pipes, preventing local heating and over-concentration of the water pipes. In addition, when cleaning the water pipe group, the cleaning liquid is sprayed from above to easily clean all the water pipes. It is possible to further reduce the size of the high-temperature regenerator.

Further, a water wall is formed around the furnace tube, and the water tube group is disposed in the furnace tube at an inclination such that the upstream side is low and the downstream side is high, and a burner is provided at a lower part of the furnace tube on the upstream side of the water tube group. As a result, a large amount of refrigerant vapor generated at the lower water wall downstream of the water pipe can be quickly discharged together with the refrigerant vapor moving inside the water pipe, and the refrigerant vapor can be prevented from accumulating at the upper part of the water wall. In addition, local overheating and overconcentration of the upper part of the water wall can be prevented.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a front view of a direct-fired high-temperature regenerator, and FIG. 2 is a vertical sectional view taken along line AA of FIG. (1) ... direct-fired high-temperature regenerator (2) ... furnace tube (4) ...
... water wall, (11A) ... water tube group, (13) ... burner.

Claims (1)

(57) [Claims] 1. A direct-fired high-temperature regenerator for generating refrigerant vapor by heating an absorbing liquid, wherein water walls are formed around the periphery of the regenerator and openings at both ends are connected to the water wall in a furnace tube forming a passage of a burner flame. A plurality of water pipes are vertically inclined, and an inlet header is provided near the opening below the water pipe to supply a rare absorbing liquid, and an outlet header that guides refrigerant vapor to the separator near the opening above the water pipe. A direct-fired high-temperature regenerator characterized by providing: