CN220287401U - Full premix condensing steam boiler capable of preventing dry combustion and easy drainage - Google Patents

Abstract

The utility model discloses a full-premix condensing steam boiler capable of preventing dry combustion and easy drainage, wherein a combustion heat exchange device comprises a packaging base shell, a combustor, a high-temperature heat exchange module, a superheated heat exchange module, a condensing heat exchange module and a steam heat exchange pipeline; the steam heat exchange pipeline comprises a water body input section, a condensation heat exchange section, an external connection section, a fluid heat exchange section, a high-temperature heat exchange section and a steam output section which are sequentially communicated; the external connecting section is provided with a circulating water pump and a drain valve; the steam output section is provided with a steam reflux detection assembly. According to the utility model, the steam heat exchange pipeline is not provided with a back-winding path, a U-shaped flow structure is not existed, and water in the steam heat exchange pipeline can flow downwards more smoothly and be discharged. Drainage is carried out from two sections, and the drainage effect is better, is difficult for producing the phenomenon of jam. And can detect whether steam flows back to the high temperature heat exchange section to in time send out the operation of alarm and shut down, avoid dry combustion method.

Description

Full premix condensing steam boiler capable of preventing dry combustion and easy drainage

Technical Field

The utility model relates to the technical field of steam boilers, in particular to a full-premix condensing steam boiler capable of preventing dry combustion and easy drainage.

Background

Steam boilers refer to boiler plants that produce steam. The combustion temperature of the steam boiler is higher, so that the exhausted flue gas is higher than that of a conventional boiler, the temperature can generally reach more than 200 ℃, and the latent heat of water vapor in the flue gas is not fully utilized. Therefore, condensing boilers are introduced in the market, which lower the exhaust gas temperature below the dew point temperature (or water dew point) of the exhaust gas by means of a heat energy utilization device to improve the energy utilization efficiency. The structure forms of the condensing boiler in the market at present mainly comprise a separation type form and an integral type form. In the operation process, the phenomenon of water vapor reflux can be generated, when the water vapor is refluxed to a high-temperature area close to a burner, a heat exchange pipeline is contacted with the water vapor in a high-temperature environment of 1000-1300 ℃, the phenomenon of corrosion or cracking is easy to generate, the steam boiler is damaged, and the service life is short.

Therefore, a full premix condensing steam boiler disclosed in patent CN202221790148.6 and a full premix condensing combustion heat exchange device for a steam boiler disclosed in patent CN202221790365.5 are proposed in the market. The combustion heat exchange device comprises a high-temperature heat exchange module, a superheated heat exchange module and a condensation heat exchange module from top to bottom; the top of the burner, which is close to the combustion heat exchange device, burns downwards, and discharges flue gas from the bottom; the main body of the steam heat exchange pipeline flows in a path from bottom to top, the flowing tail end can flow back to the overheat heat exchange module area in the middle, the heat exchange temperature of the area is in the range of 500-700 ℃, and the metal heat exchange pipe is in the ambient temperature range, so that water vapor is not easy to corrode and damage.

In order to reduce the corrosion phenomenon of the steam heat exchange pipeline, the full premix condensing steam boiler needs to discharge water in the steam heat exchange pipeline when the full premix condensing steam boiler is ready to enter a standby state which is not used for a long time. However, during actual use, it is found in colder northern areas or high altitude areas. The combustion heat exchange device comprises a path which is formed by winding the high-temperature heat exchange module at the upper end to the middle part and then upwards extending to the steam output pipeline, wherein the path is of a U-shaped flow structure, local water is easily accumulated in the middle part of the heat exchange module, and is difficult to discharge and solidify, so that the corrosion phenomenon is aggravated, or the steam heat exchange pipeline is blocked. Therefore, further improvements are needed.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the full-premix condensing steam boiler capable of preventing dry combustion and easy drainage.

The technical scheme adopted by the embodiment of the utility model for solving the technical problems is as follows: a dry-fire resistant easy-to-drain full premix condensing steam boiler comprising: a plurality of combustion heat exchange devices, a steam integrated output pipeline and a water body integrated input pipeline;

the combustion heat exchange device comprises a packaging base shell, a burner, a high-temperature heat exchange module, an overheat heat exchange module, a condensation heat exchange module and a steam heat exchange pipeline; the packaging base shell is provided with an air inlet and an air outlet, and the burner, the high-temperature heat exchange module, the overheat heat exchange module and the condensation heat exchange module are sequentially arranged in the packaging base shell on a path from the air inlet to the air outlet;

the steam heat exchange pipeline comprises a water body input section, a condensation heat exchange section, an external connection section, a fluid heat exchange section, a high-temperature heat exchange section and a steam output section which are sequentially communicated; the condensation heat exchange section is arranged on the condensation heat exchange module; the fluid heat exchange section is arranged on the overheat heat exchange module; the high-temperature heat exchange section is arranged on the high-temperature heat exchange module; the water body input section is connected with the water body integrated input pipeline; the steam output section is connected with the steam integrated output pipeline;

the external connecting section is provided with a circulating water pump and a drain valve; the steam output section is provided with a steam reflux detection assembly which can detect whether the steam of the steam output section is refluxed to the Gao Wenhuan hot section.

Optionally, the steam backflow detection assembly comprises a bypass water box and a water level detection needle; the steam output section is vertically arranged, and the bypass water box is connected in parallel with one side of the steam output section; the liquid level of the steam output section is consistent with the liquid level of the bypass water box, and the water level detection needle can detect the water level of the bypass water box.

Optionally, two bypass pipelines are vertically arranged between the bypass water box and the steam output section; the two bypass pipelines are respectively arranged close to the top and the bottom of the bypass water box; the water level detection needle is mounted at the top of the bypass water box, and the bottom of the water level detection needle extends to the bypass pipeline at the bottom.

Optionally, the steam heat exchange tubes are arranged in the condensation heat exchange module, the overheat heat exchange module and the high-temperature heat exchange module along a multi-layer roundabout pipeline structure from bottom to top.

Optionally, the external linkage segment still is provided with the steady voltage water tank, steady voltage water tank's water inlet and delivery port set up in steady voltage water tank's bottom, the air in the interior water route of condensation heat exchange module can gather in steady voltage water tank.

Optionally, the steam heat exchange pipeline is one or a combination of a plurality of flat tubes, round tubes, rectangular tubes or finned tubes.

Optionally, the steam integrated output pipeline is provided with a barometer, a thermometer and a pressure relief valve.

The utility model has the beneficial effects that: the steam heat exchange pipeline is arranged in the condensation heat exchange module, the overheat heat exchange module and the high-temperature heat exchange module along a whole path which is arranged from bottom to top in a multilayer roundabout pipeline structure, the middle overheat heat exchange module is not arranged, the steam heat exchange pipeline is not provided with a winding path, a U-shaped flowing structure does not exist, and water in the steam heat exchange pipeline can flow downwards more smoothly and be discharged under the action of gravity. An external pipeline of an external connecting section is arranged between the condensation heat exchange section and the fluid heat exchange section, and a circulating water pump is arranged on the external pipeline to ensure sufficient water pressure of waterway flow of the steam heat exchange pipeline; meanwhile, the drain valve is arranged on the external pipeline, water can be drained at the water inlet end position of the overheat heat exchange module, the water draining area of the combustion heat exchange device is divided into the external pipeline in the middle and the water input section at the bottom, water can be drained from the two sections, the water draining effect is better, and the blockage phenomenon is not easy to occur. Further, be provided with steam reflux detection subassembly at steam output section, this steam reflux detection subassembly can detect whether steam output section's steam flows back to Gao Wenhuan hot section to in time send out the operation of alarm and shut down, avoid the risk of dry combustion method.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a fully premixed condensing steam boiler according to the present utility model;

FIG. 2 is a schematic view of the combustion heat exchange device of FIG. 1 with the package base removed;

FIG. 3 is a longitudinal cross-sectional view of the fully premixed condensing steam boiler of FIG. 1 at the location of a steam reflow detection assembly;

FIG. 4 is a schematic view of the passage of the steam heat exchange line of the combustion heat exchange device of the present utility model.

Description of main reference numerals:

100. a combustion heat exchange device; 110. packaging the base shell; 111. an air inlet; 112. an air outlet; 120. a burner; 130. a high temperature heat exchange module; 140. a superheating heat exchange module; 150. a condensing heat exchange module; 160. a steam heat exchange pipeline; 161. a water input section; 162. condensing and heat exchanging section; 163. an external connecting section; 164. a fluid heat exchange section; 165. a high temperature heat exchange section; 166. a steam output section; 170. a circulating water pump; 171. a pressure stabilizing water tank; 180. a drain valve; 190. a vapor reflux detection assembly; 191. a bypass water box; 192. a water level detection needle; 193. a bypass line;

200. a steam integrated output pipeline; 300. the water body is integrated into an input pipeline.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, plural means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and the above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless clearly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be connected directly or indirectly through an intermediary; the connecting device can be fixedly connected, detachably connected and integrally formed; may be a mechanical connection; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.

Examples

Referring to fig. 1 to 4, the full premix condensing steam boiler capable of preventing dry combustion and easy drainage provided by the utility model comprises: a plurality of combustion heat exchange devices 100, a steam integrated output pipeline 200 and a water integrated input pipeline 300;

the combustion heat exchange device 100 comprises a packaging base shell 110, a combustor 120, a high-temperature heat exchange module 130, a superheated heat exchange module 140, a condensation heat exchange module 150 and a steam heat exchange pipeline 160; the packaging base shell 110 is provided with an air inlet 111 and an air outlet 112, and the burner 120, the high-temperature heat exchange module 130, the overheat heat exchange module 140 and the condensation heat exchange module 150 are sequentially arranged in the packaging base shell 110 on the path from the air inlet 111 to the air outlet 112;

the steam heat exchange pipeline 160 comprises a water body input section 161, a condensation heat exchange section 162, an external connection section 163, a fluid heat exchange section 164, a high-temperature heat exchange section 165 and a steam output section 166 which are sequentially communicated; the condensation heat exchange section 162 is disposed on the condensation heat exchange module 150; the fluid heat exchange section 164 is disposed on the superheat heat exchange module 140; the high-temperature heat exchange section 165 is disposed on the high-temperature heat exchange module 130; the water input section 161 is connected with the water integrated input pipeline 300; the steam output section 166 is connected to the steam integrated output pipe 200;

the external connecting section 163 is provided with a circulating water pump 170 and a drain valve 180; the steam output section 166 is provided with a steam reflux detection assembly 190 that detects whether steam from the steam output section 166 is refluxed to the high temperature heat exchange section 165.

In the present utility model, the steam heat exchange pipeline 160 is arranged in the condensation heat exchange module 150, the overheat heat exchange module 140 and the high-temperature heat exchange module 130 along a multi-layer detour pipeline structure from bottom to top, the middle overheat heat exchange module 140 is not arranged, the steam heat exchange pipeline 160 is not provided with a winding path, a 'U' -shaped flow structure is not arranged, and water in the steam heat exchange pipeline 160 can flow downwards and be discharged more smoothly under the action of gravity. An external pipeline of the external connection section 163 is arranged between the condensation heat exchange section 162 and the fluid heat exchange section 164, and a circulating water pump 170 is arranged on the external pipeline to ensure sufficient water pressure of the waterway of the steam heat exchange pipeline 160; meanwhile, the drain valve 180 is arranged on the external pipeline, water can be drained at the water inlet end position of the overheat heat exchange module 140, the drainage area of the combustion heat exchange device 100 is divided into the external pipeline in the middle and the water input section 161 at the bottom, water can be drained from two sections, the drainage effect is better, and the blockage phenomenon is not easy to occur. Further, a steam backflow detecting assembly 190 is disposed in the steam output section 166, and the steam backflow detecting assembly 190 can detect whether the steam in the steam output section 166 flows back to the high-temperature heat exchange section 165, and timely alarm and stop operations can be given out, so that the risk of dry burning is avoided.

In the present embodiment, since the entire waterway is disposed along the multi-layer circuitous pipeline structure from bottom to top, the high-temperature heat exchange section 165 is located in the high-temperature heat exchange module 130, and the operating temperature of the region is about 1000 to 1300 ℃, and if the steam output section 166 flows back to the heat exchange section, the phenomena of corrosion or cracking are easily generated. Therefore, the pipeline arrangement structure from bottom to top needs to be additionally provided with a reliable steam backflow detection assembly 190 to ensure the working safety of the combustion heat exchange device 100.

In this embodiment, the steam reflux detection assembly 190 includes a bypass water box 191 and a water level detection needle 192; the steam output section 166 is vertically arranged, and the bypass water box 191 is connected in parallel with one side of the steam output section 166; the liquid level of the steam output section 166 is identical to the liquid level of the bypass water box 191, and the water level detection needle 192 can detect the water level of the bypass water box 191. The bypass water box 191 is connected in parallel with one side of the steam output section 166, so that the water level and the liquid level in the steam output section 166 can be synchronized. The water in the steam output section 166 is gradually converted into high-temperature steam in the rising process and is delivered to the steam integrated output pipeline 200; during this conversion, there will be a float in the water level, while the bypass water box 191 provides a larger water storage conversion chamber which effectively reduces the float variation in the water level, and by adjusting the arrangement position, the water level of the steam conversion stays in the tray water box over a larger range during normal operation of the steam boiler. If the water level of the bypass water box 191 and the steam output section 166 is reduced rapidly due to the steam backflow phenomenon, if the water level of the bypass water box 191 is detected by the water level detection needle 192 to be insufficient or water cannot be detected, the steam backflow phenomenon of the steam heat exchange pipeline 160 of the combustion heat exchange device 100 is judged, and an electrical signal is fed back to the control center in time, so that an alarm is sent out, or operations such as shutdown are adopted in time, and the risk of dry combustion is avoided.

Specifically, the bypass water box 191 and the steam output section 166 are vertically provided with two bypass pipelines 193; two bypass lines 193 are disposed near the top and bottom of the bypass water box 191, respectively; a water level probe 192 is mounted to the top of the bypass water box 191 and a bottom extends to a bottom bypass line 193. The bypass line 193 extending from the bottom of the water level probe 192 to the bottom can accurately detect whether the water in the bypass water box 191 flows back into the high temperature heat exchange section 165.

In the present embodiment, the steam heat exchange tubes are arranged along a multi-layered detour piping structure from bottom to top within the condensing heat exchange module 150, the superheating heat exchange module 140, and the high-temperature heat exchange module 130. The single-channel coil pipe structure or the structure of reciprocating roundabout pipe distribution of a plurality of heat exchange pipes matched with rotary ports and the like can be used according to the arrangement requirements of the combustion heat exchange device 100 and combined with the prior art means, and other existing pipe distribution structures of the steam boiler combustion heat exchange device 100.

Specifically, the pipe assembly structures of the condensing heat exchange module 150, the superheating heat exchange module 140 and the high-temperature heat exchange module 130 can be set by those skilled in the art with reference to the pipe assembly structure of the patent number CN 202221790365.5.

In some embodiments, the external connection section 163 is further provided with a stabilizing water tank 171, a water inlet and a water outlet of the stabilizing water tank 171 are disposed at the bottom of the stabilizing water tank 171, and air in the water path in the condensation heat exchange module 150 can be collected in the stabilizing water tank 171. When the water in the condensation heat exchange section 162 in the condensation heat exchange module 150 passes through the pressure stabilizing water tank 171 of the external connection section 163, the air bubbles in the water path can be gathered by the pressure stabilizing water tank 171, so that the air bubbles in the water paths in the subsequent fluid heat exchange section 164 and the high-temperature heat exchange section 165 are reduced, and the erosion and working noise is reduced.

Specifically, the surge tank 171 may be provided in an expansion tank structure, and an elastic membrane structure may be provided at the top.

In the present embodiment, the steam heat exchange line 160 is a combination of one or more of flat tubes, round tubes, rectangular tubes, or finned tubes, depending on the arrangement of the combustion heat exchange device 100, and the product positioning.

In this embodiment, the steam integrated output pipe 200 is installed with a barometer, a thermometer, and a pressure relief valve. The barometer can detect the steam pressure value in the steam output pipeline, the thermometer can detect the steam temperature in the steam output pipeline, and the steam in the steam output pipeline can be locally discharged through the pressure release valve so as to reduce the steam pressure in the steam output pipeline.

Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims (7)

1. The utility model provides a prevent full premix condensing steam boiler of easy drainage of dry combustion method which characterized in that includes: a plurality of combustion heat exchange devices (100), a steam integrated output pipeline (200) and a water body integrated input pipeline (300);

the combustion heat exchange device (100) comprises a packaging base shell (110), a combustor (120), a high-temperature heat exchange module (130), a superheated heat exchange module (140), a condensation heat exchange module (150) and a steam heat exchange pipeline (160); the packaging base shell (110) is provided with an air inlet (111) and an air outlet (112), and the burner (120), the high-temperature heat exchange module (130), the overheat heat exchange module (140) and the condensation heat exchange module (150) are sequentially arranged in the packaging base shell (110) on the path from the air inlet (111) to the air outlet (112);

the steam heat exchange pipeline (160) comprises a water body input section (161), a condensation heat exchange section (162), an external connection section (163), a fluid heat exchange section (164), a high-temperature heat exchange section (165) and a steam output section (166) which are sequentially communicated; the condensation heat exchange section (162) is arranged on the condensation heat exchange module (150); the fluid heat exchange section (164) is disposed at the superheat heat exchange module (140); the high-temperature heat exchange section (165) is arranged on the high-temperature heat exchange module (130); the water body input section (161) is connected with the water body integrated input pipeline (300); the steam output section (166) is connected with the steam integrated output pipeline (200);

the external connecting section (163) is provided with a circulating water pump (170) and a drain valve (180); the steam output section (166) is provided with a steam reflux detection assembly (190) that detects whether steam from the steam output section (166) is refluxed to the Gao Wenhuan hot section (165).

2. The dry-heating-preventing easy-to-drain full premix condensing steam boiler according to claim 1, wherein: the steam backflow detection assembly (190) comprises a bypass water box (191) and a water level detection needle (192); the steam output section (166) is vertically arranged, and the bypass water box (191) is connected in parallel with one side of the steam output section (166); the liquid level of the steam output section (166) is consistent with the liquid level of the bypass water box (191), and the water level detection needle (192) can detect the water level of the bypass water box (191).

3. The dry-heating-preventing easy-to-drain full premix condensing steam boiler according to claim 2, wherein: two bypass pipelines (193) are vertically arranged on the bypass water box (191) and the steam output section (166); two of the bypass lines (193) are disposed adjacent the top and bottom of the bypass water box (191), respectively; the water level detection needle (192) is mounted at the top of the bypass water box (191), and the bottom extends to the bypass pipeline (193) at the bottom.

4. The dry-heating-preventing easy-to-drain full premix condensing steam boiler according to claim 1, wherein: the steam heat exchange tubes are arranged in the condensation heat exchange module (150), the overheat heat exchange module (140) and the high-temperature heat exchange module (130) along a multi-layer roundabout pipeline structure from bottom to top.

5. The dry-heating-preventing easy-to-drain full premix condensing steam boiler according to claim 1, wherein: the external connection section (163) is further provided with a pressure stabilizing water tank (171), a water inlet and a water outlet of the pressure stabilizing water tank (171) are arranged at the bottom of the pressure stabilizing water tank (171), and air in a water path in the condensation heat exchange module (150) can be gathered in the pressure stabilizing water tank (171).

6. The dry-heating-preventing easy-to-drain full premix condensing steam boiler according to claim 1, wherein: the steam heat exchange pipeline (160) is one or a combination of a plurality of flat pipes, round pipes, rectangular pipes or finned pipes.

7. The dry-heating-preventing easy-to-drain full premix condensing steam boiler according to claim 1, wherein: the steam integrated output pipeline (200) is provided with a barometer, a thermometer and a pressure relief valve.