JPS59115914A - Drain treating device of gas burner - Google Patents

Abstract

PURPOSE:To prevent choking of the interior of a device, by a method wherein drain, from which dust is removed, is caused to flow from the lower part of the inside of a case to the upper part as it is forced into contact with a neutralizing treatment. CONSTITUTION:High acid drain, introduced through a drain introducing pipe 10, is separated into drain and dust according to a specific gravity in a dust reservoir 11, and enters a case 12 after passing through a flow-in port 13. The drain, passing through a drain flow passage 16 and opening parts of partition plates 19, 19' and 19'', is forced into contact with neutralizing treatments 21, 21' and 21'' with which a fibrous bag is filled, and flows upward within the case 12. Scale with particle grain size, produced resulting from chemical reaction between metal ion in the drain and the neutralizing treatments 21, 21' and 21'', flows out from a fibrous bag, passes through the opening parts of the partition plates 19, 19' and 19'', and is accumulated on scale precipitating tanks 22, 22' and 22''. Further, a part of the drain, introduced to the case 12, passes through a pipe 17 after passing through bypass holes 18, 18' and 18'', and joins drain flowing in the direction of an upper part through a drain flow passage 16 to discharge it through a drain discharge pipe 15.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a system for reducing the acidity of highly acidic condensate generated and recovered during indirect heat exchange between combustion gas and water by interposing it in a fluidic discharge path. This invention relates to a drain treatment device for a gas combustor for neutralizing heat.

(Configuration of conventional example and its problems) In such a drain processing device for a gas combustor, for example, highly acidic drain that condenses in a heat exchanger in a gas combustor is introduced into a box-shaped case, and the drain flows in a zigzag pattern. It has been proposed that a channel is filled with a large number of solid neutralizing substances along the direction of the drain flow line, and the drain treatment is performed by repeatedly bending the substance along the outer circumferential surface of the channel.

However, in such drain processing equipment, solid neutralization is difficult due to the formation of poorly soluble scale due to the reaction between the solid neutralizing substance and metal ions in the drain, and the mixing of atmospheric dust into the drain. Problems include the fact that the active surface of the substance is coated and the neutralization reaction is hindered, and scale builds up inside the box-like case, causing clogging and causing equipment trouble. It had a point.

(Object of the Invention) In view of the above-mentioned problems, an object of the present invention is to provide a drain treatment device for a gas combustor, which prevents clogging in the device and extends the life of the neutralization treatment agent.

(Structure of the Invention) The drain treatment device for a gas combustor of the present invention includes a box-shaped case portion having an inlet at the bottom and an outlet at the top, a dust storage portion provided at the lowest part of the device, and a neutralization treatment device. A neutralizing treatment part is installed so that the drain flowing from the bottom to the top in the case comes into contact with the neutralizing agent. Highly acidic drain is neutralized by flowing it while in contact with the water.

Further, a scale sedimentation tank is provided below the neutralization treatment section, and the scale generated by the chemical reaction between the drain and the neutralization treatment agent is sedimented therein.

(Description of Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.

First, the interior of the gas combustor will be schematically explained with reference to FIG. In general, a gas combustor has a primary heat exchanger 2 and a secondary heat exchanger 3 in an exhaust passage 9 for combustion gas generated by combustion of air introduced by an air supply/exhaust fan 8 and fuel gas sent to a burner 1. is installed. On the other hand, the feed water is introduced from the water supply pipe 4 to the primary heat exchanger 2, where indirect heat exchange is performed between the combustion gas and water. Furthermore, this water flows through the secondary heat exchanger 3, where indirect heat exchange is performed again, and the hot water is supplied through the hot water supply pipe 5 as hot water. The drain containing metals such as lead that condenses in the secondary heat exchanger 3 in this gas combustor is collected in a drain tray 6,
The drain is passed through the drain pipe 7 and is neutralized by the drain treatment device A.
It is discharged outside the vessel.

FIG. 2 shows an embodiment of the drain treatment device for a gas combustor according to the present invention. In FIG. , 11 is a dust storage tank provided at the lowest end of the drain introduction pipe 10, 12 is provided with an inlet 13 communicating with the drain introduction pipe 10 in the lower part, and an outlet 14 communicating with the drain discharge pipe 15 in the upper part. box-like case, 16 is case 1
Drain flow path in 2, 17 is a bypass pipe, 18, 18'
.

18 is a bypass hole communicating with the bypass pipe 17.

19.19', 19'' are partition plates fixed by partition plate fixing jigs 20, 20', 20// provided on the inner wall of the case 12, 21.21', 2111 are filled in a fibrous bag. With the neutralizing agent placed on each partition plate 19, 19', 19//, in this embodiment, the case 12 is
It is set up in multiple stages inside. 22, 22', 22〃 are scale sedimentation tanks installed below the respective partition plates 19, 19', 19//.

In the combustor drain treatment device configured as described above, the highly acidic drain introduced into the drain inlet pipe 10J:D is separated into drain and dust by specific gravity in the dust collection tank 11, and then transferred to the inlet 13.
Pass through and enter the case 12.

Next is the drain flow path 16 and the partition plate 19.19'.

The drain that has passed through the opening 19 comes into contact with the neutralized materials 21, 21' and 1 filled in the fibrous bag, and flows upward in the case 12. In addition, fine scales generated due to the chemical reaction between metal ions, etc. in the drain and the neutralizing agent 21.21', 21'' flow out from the fibrous bag, and are removed from the partition plates 19, 19.' , 19// and is deposited in the scale settling tanks 22.22', 22//.Furthermore, a part of the drain introduced into the case 12 is deposited in the bypass holes 18.18', 18// through the bypass holes 18.18', 18//. tube 1
7, joins with the drain flowing upward through the drain flow path 16, and is discharged through the drain discharge pipe 15.

Note that if the neutralizing agents 21, 21', 21// are made into granular substances, they can be easily put into the bag, and the box-shaped case 1
If 2 is made of a transparent synthetic resin or the like, the lifespan of the neutralizing agent can be easily checked from the outside by checking the degree of discoloration inside.

(Effects of the Invention As explained above, the present invention allows drain from which dust has been removed by passing through a dust storage tank to flow from the lower part to the upper part of the case while being in contact with a neutralizing agent. The scale generated due to the chemical reaction with the neutralizing agent is settled in the scale settling tank, which prevents clogging in the equipment and extends the life of the neutralized material. Furthermore, if the neutralizing treatment agent is installed in the case in multiple stages as in the above-mentioned embodiment, highly acidic drain can be efficiently neutralized.Therefore, the present invention According to the present invention, it is possible to provide an economical and highly reliable drain treatment device for a gas combustor.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a gas combustor, and FIG. 2 is a sectional view showing an embodiment of a drain processing device for a gas combustor according to the present invention. 10...Drain introduction pipe, 11...Dust collection right, 12
... Box-shaped case, 13 ... Inlet, 14 ... Outlet 115° ... Drain discharge pipe, 16 ... Drain flow path, 17 ... Pipe and gas pipe, 11L18' + 18"・
... Kui Gusuhole, 19, 19. ', 19〃・
・Partition plate, 20.20', 20...Partition plate fixing jig, 21.21', 21...Neutralizing agent, 22
, 22', 22〃...Scale sedimentation rights. Figure 1 Figure 2

Claims (4)

[Claims] (1) In a drain treatment device for a gas combustor, which is placed in a flow discharge path for highly acidic drain generated and recovered due to indirect heat exchange between combustion gas and water, and neutralizes the acidity of the drain. , a box-shaped case part having an inlet at the bottom and an outlet at the top, a dust reservoir part provided at the lowest part of the device, and a neutralizing agent, and a drain flowing from the bottom to the top in the case part. 1. A drain processing device for a gas combustor, comprising: a neutralization processing section installed so as to be in contact with each other. (2) The drain processing device for a gas combustor according to claim (1), wherein the neutralization processing section is installed in multiple stages. (3) Claim No. 3, characterized in that the neutralizing agent is made of particulate material filled in a fibrous bag.
The drain processing device for a gas combustor according to item 1) or item (2). (4) Claims (1) to (3) characterized in that the case body has a scale sedimentation tank inside.
) The drain treatment device for a gas combustor according to any one of the items.