CN2169034Y - Heat recovering device for boiler with continuous waste discharge - Google Patents

Abstract

The utility model relates to a heat recovering device with automatic and continuous waste discharge. The utility model is mainly characterized in that the utility model is composed of two heat exchangers, and housings of the two heat exchangers are communicated with each other through a pipe at the adjacent end. Two sets of heat exchanging pipes, each of which is arranged in the respective housing, are connected with each other into integration, wherein, a section of the heat exchanging pipe provided with a waste water discharge outlet is made of metal material which is sensitive to temperature, and an adjusting device which has a close board and is coaxial with the heat exchanging pipe is arranged on the position which has a definite distance from the waste water discharge outlet. The utility model has the advantages of simple structure and reliable operation, without causing the problem of excessive or insufficient discharge; the utility model improves the operation performance of boilers and fully utilizes heat energy in the form of heat exchange. Thereby, the heat efficiency of the boilers can be enhanced effectively.

Description

Heat recovering device for boiler with continuous waste discharge

The utility model is the configuration of a kind of and steam boiler, and the boiler of feeding continuous blowdown also reclaims the automatic continuous blowdown thermal energy recoverer of its heat energy.

Steam boiler is constantly exported steam in thermal procession, total solid concentration or basicity can rise gradually in the stove water simultaneously, the steam quality that boiler is produced worsens, therefore, steam boiler generally all must dispose a boiler water continuous blow-down device, along with entering, feedwater constantly gathers concentrated solid content and basicity to get rid of in the stove water, if blowdown is too much, then can make a large amount of heats of boiler loss, the continuous blowdown amount should be adjusted to and the concentration of each material in the stove water be remained in the relevant index of national regulation exceed.The existing general device that is used for continuous blowdown is a kind of " continuous blowdown expander ", and this is a circular tank with effluent from boiler inlet, indirect steam outlet and blowoff valve, is provided with a cover floating ball device in the tank body, with the water level in the control tank body; The tank body arranged outside has annexes such as the necessary Pressure gauge of pressure vessel, safety valve.The action principle of this expander is, when the high temperature sewer that is come by boiler enters this tank body, i.e. decompressional expansion suddenly and flash distillation takes place produces indirect steam and cooling, indirect steam from the tank body steam (vapor) outlet output and use it for anything else, the sewer after the cooling is discharged from blowoff valve.The weak point of this blowdown expander is: the one, and the continuous blowdown system of boiler water yield that enters this expander can not be regulated automatically with the variation of boiler feed capacity, cause that it still keeps original blowdown flow rate when boiler feedwater reduces, then just drain a large amount of heat energy in the boiler meaninglessly, and when boiler feed capacity increases, still keep original few relatively blowdown flow rate, then stove water water quality deterioration and influence the boiler quality of steaming; The 2nd, though enter the stove water of this device has utilized indirect steam through expanding cooling heat energy, the sewer temperature in the expander still has about 100 ℃, promptly still has a large amount of recuperable heat energy to be discharged.In addition, this expander is equipped with a cover flow regulation valve for keeping its liquid level, and this control method movable member is many, increases temperature influence again, breaks down easily.

The purpose of this utility model is for the full-automatic continuous blowdown thermal energy recoverer of the boiler that a kind of novelty is provided, to replace existing continuous blowdown expander, making it to reach blowdown flow rate can change autobalance and make full use of the purpose of high temperature sewage heat energy with boiler feed capacity, and makes it simple in structure, reliable.

The utility model that achieves the above object is made up of two heat exchangers, and every heat exchanger has housing and one group of heat-exchange tube that has end cap.Two heat exchanger shell are communicated with pipeline at abutting end, make two housings only have a boiler feedwater water inlet and a delivery port; Be separately positioned on that heat-exchange tube interconnects in two housings, make two groups of heat-exchange tubes only have a sewer water inlet pipe end and a draining pipe end.Be provided with at housing one end the heat-exchange tube with sewer water inlet pipe end is set in this heat exchange housing of boiler feedwater delivery port, and be provided with the heat-exchange tube with sewer draining pipe end is set in this heat exchange housing of boiler feedwater water inlet at housing one end, also include one group of thermally sensitive parts in this heat-exchange tube, and the end cap portions at this heat exchanger is provided with an adjusting device over against sewer draining pipe end, makes to have a gap between adjusting device and sewer draining pipe end.Said blowdown thermal energy recoverer, the sewer of being sent here by boiler flows into and discharges from the heat-exchange tube with sewer draining pipe end from the heat-exchange tube with sewer water inlet pipe end, boiler feedwater then flows into and flows out from the delivery port of housing that the heat-exchange tube with sewer water inlet is housed from the water inlet of housing that the heat-exchange tube with sewer discharge outlet is housed, and deliver to boiler, i.e. boiler feedwater is opposite with the flow direction of boiler high temperature sewer in heat exchanger.Sewer in the heat-exchange tube is given the boiler feedwater of flowing thermal energy transfer in heat exchanger shell in flowing, play the effect of sufficient heat exchange.When the boiler feed capacity in entering heat exchanger changes, cause that medium temperature changes, the any temperature-sensitive components generation dilatation in the heat-exchange tube then, automatically regulate the gap between heat-exchange tube sewer draining pipe end and adjusting device, thereby the flow in the change heat-exchange tube, sewer discharge capacity and boiler feedwater inflow in the heat-exchange tube are adapted, when the feedwater stop, close sewer draining pipe end.

Therefore, the utility model has the advantages that: the utility model is to adopt the heat exchange form to utilize the heat energy heating boiler supplementary feed of boiler high temperature sewage, this has made full use of the heat energy of boiler high temperature sewage on the one hand, the temperature of high temperature sewage can be reduced to about 60 ℃, the boiler feedwater that heats up through heat exchange on the other hand, temperature raises about 40 ℃, and this make-up water is sent into the thermal efficiency that can improve boiler in the boiler.And see that by said structure the boiler blowdown water discharge capacity can automatically adjust according to boiler feed capacity, and therefore, the problem of excess discharging or not enough discharging can not take place, improved the operating characteristics of boiler.Having to be, is the movable part except that sewer emissions adjustment device in the utility model again, and all the other all are stationary installations, therefore has the advantage of reliable in structure, and the fault of blowdown thermal energy recoverer generally can not take place in the boiler heating power running.

A preferred embodiment of the present utility model as shown in drawings.Below in conjunction with accompanying drawing the utility model is described specifically.

Description of drawings: Fig. 1 is vertical cross-sectional schematic of the present utility model.

Seen that by accompanying drawing present embodiment is made up of two heat exchangers, every heat exchanger has 1, the 9 and one groups of heat-exchange tubes 2,10 of housing that have end cap 6,12.Housing 1 and 9 is communicated with pipeline at abutting end.Be provided with a boiler supplementary feed water inlet 3 at housing 1 one ends, and on its end face the configuration end cap 6, also be provided with a dividing plate 4 at this end face and 6 of end caps, being equipped with one on the end cap 6 has the adjusting screw(rod) 7 of shrouding and a sewer discharge outlet 8 is being set, the one end sealing of housing 9, the end of the other end is provided with a boiler feedwater delivery port 11, disposes end cap 12 on its end face.One group of heat-exchange tube 2 is set in the heat exchanger shell 1, one group of heat-exchange tube 10 is set in the heat exchanger shell 9, the afterbody of the head of heat-exchange tube 2 and heat-exchange tube 10 fuses; The afterbody of heat-exchange tube 2 is erected on the dividing plate 4, its center is over against the center of adjusting screw(rod) 7, and the thermally sensitive metal of these heat-exchange tube 2 usefulness is made, the elongation of when temperature raises, will expanding, when reducing, temperature will shrink shortening, then heat-exchange tube 2 will vary with temperature and stretch, and change the gap 5 between heat-exchange tube 2 pipe ends and adjusting screw(rod) 7 upper sealing plates, thereby regulate the discharge capacity of sewer in the heat-exchange tube 2.For example, when boiler supplementary feed amount kept stablizing, water temperature and blowdown water temperature in heat exchanger shell 1 and the heat-exchange tube 2 were constant, and then gap 5 is constant, and the sewer discharge capacity keeps initial setting constant; When confluent increased, because of the water temperature in the housing 1 and the sewer temperature drop of managing in 2 are low, then the wall temperature of heat-exchange tube 2 descended thereupon and shrinks, and gap 5 is strengthened, and water amount of blowdown strengthens; On the contrary, when feedwater flow reduced, water temperature in the housing 1 and the blowdown water temperature of managing in 2 rose, and then the wall temperature of heat-exchange tube 2 rises thereupon and expands, and gap 5 dwindles, and water amount of blowdown reduces; When the feedwater stop, water temperature in the housing 1 and the blowdown water temperature of managing in 2 further raise and expansion, are zero until gap 5, and blowdown is stop thereupon.See by figure that again the header shelf of heat-exchange tube 10 is located on the end cap 12.The valve 13 of the sewer that boiler is sent here by being arranged on heat-exchange tube 10 heads (sewage inlet) flows into, and the sewage effluent after flow through heat-exchange tube 10 and 2 whole pipe from the end cap 6 of the afterbody outlet that is positioned at heat-exchange tube 2 is discharged.

Because can being arranged on valve 13 near end plate 12 sewer entrance points with heat exchanger 10, the setting of the boiler original continuous blowdown flow rate that boiler feedwater water quality difference causes carries out.

Claims (1)

1, a kind of boiler automatic continuous blowdown thermal energy recoverer, it is characterized in that: form by two heat exchangers, every heat exchanger has housing (1,9) and one group of heat-exchange tube (2,10) that is arranged in the housing (1,9) that has end cap (6,12), and:

A, heat exchanger shell (1) and (9) are communicated with pipeline at abutting end; The end that end cap (6) is set on the housing (1) is provided with boiler supplementary feed import (3), and between the end face of this end and end cap (6), also be provided with a dividing plate (4), be equipped with one on the end cap (6) and have the adjusting device (7) of shrouding and a sewer delivery port (8) is being set; The end that one end of housing (9) sealed, was provided with the other end of end cap (12) is provided with a boiler feedwater delivery port (11);

B, the head that is arranged on the heat-exchange tube (2) in the housing (1) fuses with the afterbody that is arranged on the heat-exchange tube (10) in the housing (9); The afterbody of heat-exchange tube (2) is erected at that dividing plate (4) is gone up, its center is over against the center of adjusting device (7), and this heat-exchange tube (2) is made with thermally sensitive metal, has an adjustable clearance (5) between heat-exchange tube (2) tail end face and adjusting device; The header shelf of heat-exchange tube (10) is located on the end cap (12) of housing (9).

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