Flue gas waste heat recovery system

Abstract

A flue gas waste heat recovery system comprises a waste heat evaporator, and a coil pipeline in the waste heat evaporator is connected with a steam pocket. A soft water inlet pipe is arranged in the steam pocket, the soft water inlet pipe is connected with an external soft water tank, a water return pipe is arranged at the bottom of the steam pocket, and the water return pipe is connected with a water inlet pipe of the coil pipe; a steam inlet pipe is arranged on the steam pocket and is connected with a coil pipe; a uniform pore plate is arranged at the upper part of the inner cavity of the steam pocket; and a steam discharge pipe is also arranged at the upper part of the steam pocket. According to the utility model, the problems of large water consumption and easy pipe blockage of waste heat recovery equipment in the prior art are solved, and soft water circulation is realized through a simple structure; and particularly, the equipment arrangement forms are reasonable, the integration degree is higher, the operation is safer, and the safety popularization value is higher.

Description

Technical Field

[0001] The utility model relates to the field of waste heat recovery, in particular to a flue gas waste heat recovery system. Background Art

[0002] Waste heat recovery helps to avoid energy loss. The recovered heat energy can be applied to many fields and has a positive role in promoting energy conservation and emission reduction. In the prior art, the recovery of hot flue gas and superheated steam is generally carried out by direct heat exchange through a waste heat evaporator, and the hot steam after heat exchange is discharged in a centralized manner. However, the setting form of such products in the prior art is not reasonable, and there are generally problems such as large water consumption and main pipe blockage caused by high water content in steam. In view of the above situation, there is currently a lack of corresponding solutions. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a flue gas waste heat recovery system with a more reasonable arrangement, water flow capable of being recycled to reduce soft water consumption and not prone to pipe clogging.

[0004] The device includes a waste heat evaporator, wherein the waste heat evaporator pipeline is connected to the hot flue gas;

[0005] The waste heat evaporator comprises a body shell, a coil is arranged in the body shell, and the coil pipeline is connected to the steam drum;

[0006] A soft water inlet pipe is arranged in the drum, the soft water inlet pipe is connected to an external soft water tank, and a water pump is arranged on the soft water inlet pipe; a return pipe is arranged at the bottom of the drum, and the return pipe is connected to the inlet pipe of the coil; the effect achieved by this is to realize soft water circulation and reduce water consumption;

[0007] The steam drum is provided with a steam inlet pipe, and the steam inlet pipe is connected to the coil;

[0008] An equalizing plate is arranged at the upper part of the inner cavity of the steam drum, and a steam discharge pipe is also arranged at the upper part of the steam drum;

[0009] The orifice plate is used to reduce the water content of steam, that is, the steam flows out toward the steam drain pipe through the orifice plate, part of the water vapor is recovered by the orifice plate, the condensed water droplets fall back into the steam drum, and then flow back to the soft water tank through the return water pipe.

[0010] The effect achieved in this way is that the hot flue gas is heat exchanged through the waste heat evaporator, the steam-water mixture in the exhaust pipe flows into the steam drum to complete the steam-water separation, and the pure steam is discharged through the steam exhaust pipe.

[0011] The beneficial effects of the utility model are as follows: the utility model solves the problems of large water consumption and easy pipe clogging of waste heat recovery equipment in the prior art, and realizes soft water circulation through a simple structure; in particular, the equipment setting form is reasonable, the integration is higher, the operation is safer, and it also has greater safety promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a flue gas waste heat recovery system described in the utility model;

[0013] Figure 2 It is a structural schematic diagram of a steam drum in a flue gas waste heat recovery system described in the utility model;

[0014] Reference numerals:

[0015] 1-steam drum 2-waste heat evaporator 3-return pipe 4-water pump 5-soft water tank 6-steam discharge pipe

[0016] 11-Safety valve 12-Water level monitoring meter 13-Equalizing plate 14-Steam inlet pipe 15-Soft water inlet pipe

[0017] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0018] Reference Figure 1 , Figure 2 , a flue gas waste heat recovery system described in the utility model comprises a waste heat evaporator 2, wherein the waste heat evaporator 2 is connected to hot flue gas through a pipeline;

[0019] The waste heat evaporator 2 comprises a body shell, a coil is arranged in the body shell, and the coil pipeline is connected to the steam drum 1;

[0020] A soft water inlet pipe 15 is provided in the drum 1, the soft water inlet pipe 15 is connected to an external soft water tank, and a water pump 4 is provided on the soft water inlet pipe 15; a return pipe 3 is provided at the bottom of the drum 1, and the return pipe 3 is connected to the inlet pipe of the coil; the effect achieved by this is to realize soft water circulation and reduce water consumption;

[0021] The steam drum 1 is provided with a steam inlet pipe 14, and the steam inlet pipe 14 is connected to the coil;

[0022] An equalizing plate 13 is provided at the upper part of the inner cavity of the steam drum 1, and a steam discharge pipe 6 is also provided at the upper part of the steam drum 1;

[0023] The averaging plate 13 is used to reduce the water content of steam, that is, the steam flows out to the steam drain pipe through the averaging plate 13, and part of the water vapor is recovered by the averaging plate 13, and the condensed water droplets fall back into the steam drum 1 and return to the soft water tank through the return water pipe.

[0024] The effect achieved in this way is that the hot flue gas exchanges heat through the waste heat evaporator 2, the steam-water mixture in the exhaust pipe flows into the steam drum 1 to complete the steam-water separation, and the pure steam is discharged through the steam exhaust pipe 6.

[0025] Furthermore, a water level detector 12 is provided in the steam drum 1, and the water pump 4 is connected to the control system through a signal of the water level detector 12.

[0026] The effect achieved in this way is to replenish water into the steam drum 1 through the coordinated control of the automatic control system.

[0027] Preferably, the automatic control system adopts PLC.

[0028] Furthermore, one or more waste heat evaporators are provided.

[0029] The effect achieved by this is that a single steam drum 1 integrates multiple waste heat evaporators for use, which occupies a smaller area, has a higher degree of integration, and has lower procurement and assembly costs.

[0030] Furthermore, a safety valve 11 is also provided on the steam drum 1.

[0031] The effect achieved in this way is to avoid special situations such as blockage of the steam discharge pipe 6, and the safety valve 11 releases pressure in the event of an over-limit situation, thereby ensuring production safety.

[0032] Furthermore, the coil is provided with heat exchange fins in an array, thereby improving the heat exchange efficiency.

[0033] Preferably, the waste heat evaporator 2 is also provided with a purification and discharge device.

[0034] When the utility model is in use, superheated steam, flue gas, etc. enter the inner cavity of the waste heat evaporator 2 for continuous heat exchange and are then discharged; the soft water in the soft water tank 5 is transported to the steam drum 1 by the water pump 4 and the water flow is transported to the coil by the return pipe 3 at the bottom of the steam drum 1; the coil undergoes continuous heat exchange with hot steam, flue gas, etc., and the water-containing hot steam generated enters the steam drum 1 upward, and is collected by the orifice plate 13 to form pure steam and be discharged; the water in the steam drum 1 continuously flows into the coil through the return pipe 3, and is replenished by the water pump 4 through liquid level detection to form a cycle.

[0035] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flue gas waste heat recovery system, comprising a waste heat evaporator, wherein the waste heat evaporator pipeline is connected to hot flue gas, the waste heat evaporator comprises a body shell, and a coil is arranged in the body shell, characterized in that: The coil pipe is connected to the steam drum; A soft water inlet pipe is arranged in the drum, the soft water inlet pipe is connected to an external soft water tank, and a water pump is arranged on the soft water inlet pipe; a return pipe is arranged at the bottom of the drum, and the return pipe is connected to the inlet pipe of the coil; The steam drum is provided with a steam inlet pipe, and the steam inlet pipe is connected to the coil; An equalizing plate is arranged on the upper part of the inner cavity of the steam drum, and a steam discharge pipe is also arranged on the upper part of the steam drum.

2. A flue gas waste heat recovery system according to claim 1, characterized in that: A water level detector is arranged in the steam drum, and the water pump is connected to the control system through signals from the water level detector.

3. The flue gas waste heat recovery system according to claim 1, characterized in that: The waste heat evaporator is provided with one or more.

4. The flue gas waste heat recovery system according to claim 1, characterized in that: The steam drum is also provided with a safety valve.

5. The flue gas waste heat recovery system according to claim 1, characterized in that: The coil is arrayed with heat exchange fins.

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