CN112113200A

CN112113200A - Condensing type gas steam module furnace

Info

Publication number: CN112113200A
Application number: CN202010841313.5A
Authority: CN
Inventors: 刘维
Original assignee: 刘维
Current assignee: Guangdong Puruima Industrial Co.,Ltd.
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2020-12-22

Abstract

The invention discloses a condensing gas-steam module furnace which is provided with a steam-water separator and a plurality of steam generation modules, wherein each steam generation module is provided with a burner and a heat exchanger and used for heating water into steam, the steam-water separator is connected with the heat exchanger and used for carrying out steam-water separation and outputting the steam, and meanwhile, the separated water is sent to the heat exchanger again. The steam furnace is provided with the plurality of steam generation modules and the steam-water separator, steam generated by the steam generation modules enters the steam-water separator, the separated saturated steam is subjected to constant-pressure regulation and constant-pressure output, the load change has no influence on the pressure, the water supply in the steam generation modules is not influenced, dry burning can be prevented, and the steam furnace is high in practicability.

Description

Condensing type gas steam module furnace

Technical Field

The invention belongs to the technical field of boilers, and particularly relates to a condensing type gas steam module furnace.

Background

The steam boiler refers to a heat energy conversion device for producing steam, and is classified into complicated types, and the gas steam boiler is one branch of the steam boiler. The traditional gas steam boiler is also a discrete two-return boiler and a horizontal three-return boiler. They all share a common feature: no matter the tonnage is large, only one combustion chamber (hearth) is provided, when the boiler works, fuel is combusted to generate high temperature, water on a water-cooling wall in the hearth is heated to be boiled and vaporized, steam with certain parameters (pressure and temperature) is generated and enters a steam drum to be subjected to steam-water separation, then saturated steam is output, and the separated water enters into recirculation. The steam drum is also called a boiler barrel and has a certain water level height, a water supply system supplies water to the steam drum when the water level of the steam drum is low, and stops supplying water when the water level of the steam drum reaches a high water level, and the intermittent water supply mode can cause the periodic change of the temperature of the boiler water and the fluctuation of the temperature of the saturated steam. The thermal efficiency of the gas-steam boiler can reach 90% at most under the most economical operation condition, but in practical use, in order to meet the change of steam demand, the boiler is often operated under the low-load condition, and the thermal efficiency at the moment is probably less than 80%. For example, most of natural gas steam boilers used at present have factory-calibrated gas consumption per ton of steam of 75-80 cubic meters, which means the gas consumption of the boiler in constant working under the most economic operation condition, but the gas consumption in actual operation can reach 85-90 cubic meters or even higher, which is undoubtedly great cost for industries with high dependence on steam requirements.

With the rise of gas modular ovens over the years, a number of gas steam modular oven brands have emerged on the market. In most of the industrial fields and services where steam is required, in addition to power generation, the use of gas-fired steam module furnaces to provide steam does have many advantages, such as: the combined type boiler has the advantages of small volume, light weight and convenience in installation, can realize modular combination in the boiler and modular combination among the boilers when a plurality of boilers are operated in parallel, has diversified power regulation, is superior to the traditional boiler in the aspect of energy conservation, and is one of important advantages in safety. However, the existing gas-steam modular furnaces are not provided with steam-water separators, the working principle is similar to that of the traditional through-flow boiler, the difference is that the steam outlet of each module of the gas-steam modular furnace is positioned at the highest temperature of a hearth, while the steam outlet of the traditional through-flow boiler is positioned on a superheater of a middle temperature section of a flue, and the essential difference is realized; in addition, due to cost reasons, the existing gas-steam modular furnace cannot have the control capability that the feed water and the fire power of the traditional through-flow boiler are adjusted to closely follow the load change. Therefore, the stability of the steam pressure and the temperature is difficult to ensure, the steam temperature is too high, dry burning is easy to occur, key heat exchangers can be damaged, on the contrary, the steam temperature is too low, the heat energy of the output steam is reduced, and the heat efficiency is greatly reduced. The existing gas steam module furnaces lack condensation heat exchange, and the highest heat efficiency can not reach the first-level energy efficiency.

Disclosure of Invention

In order to solve one of the above problems, the present invention provides a condensing gas steam module furnace.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a condensing gas steam module stove, is provided with catch water and a plurality of steam generation module, every steam generation module all is provided with combustor and heat exchanger for heat water for steam, catch water connects heat exchanger for steam, separation of water, and with steam output, send into again the water after the separation simultaneously heat exchanger.

Preferably, the steam generation module still is provided with the condensation heat exchanger, heat exchanger set up in the combustor top is provided with first input port and first delivery outlet, the condensation heat exchanger set up in heat exchanger's top is provided with second input port and second delivery outlet, the second delivery outlet intercommunication first input port, the water source is connected to the second input port, makes when the combustor is worked, rivers warp get into after the condensation heat exchanger preheats heat exchanger heats the vaporization.

Preferably, the steam generation module is further provided with a flue gas collection device, the flue gas collection device is arranged above the heat exchanger and used for collecting combustion tail gas generated by the work of the combustor, and the condensation heat exchanger is arranged at the output end of the flue gas collection device.

Preferably, the combustor and the heat exchanger are arranged in a closed shell, a smoke collection port is formed in the upper end of the shell, the smoke collection device is installed at the upper end of the shell and connected with the smoke collection port, the smoke collection device specifically comprises a fan fixing plate and a fan, the fan fixing plate is installed at the upper end of the shell and covers the smoke collection port, and the fan is installed on the fan fixing plate and provided with a smoke discharge port for collecting combustion tail gas generated by the operation of the combustor from the smoke collection port and discharging the combustion tail gas to the condensation heat exchanger from the smoke discharge port.

Preferably, the heat exchanger is stacked with a plurality of layers of heat exchange pipelines, the two adjacent layers of heat exchange pipelines are sequentially communicated, and a gap for combustion tail gas to pass through is reserved in each layer of heat exchange pipeline.

Preferably, be provided with the combustion chamber in the casing, the combustion chamber includes front end open-ended fixed bolster and closed fixed bolster front end open-ended combustion chamber apron, be provided with a plurality of mounting grooves of front end open-ended on the both sides lateral wall of fixed bolster, the heat transfer pipeline can be followed the front end of mounting groove and pushed and be fixed in the mounting groove.

Preferably, the condensation heat exchanger is provided with a condenser shell and a condensation pipe arranged in the condenser shell, the condenser shell and the fan fixing plate are arranged on the top of the shell in parallel, and the condenser shell is communicated with the smoke outlet.

Preferably, the condenser pipe includes inlet tube, outlet pipe and a plurality of heat exchange tube, inlet tube and outlet pipe level set up and are parallel to each other, just the outlet pipe is located the top of inlet tube, the water inlet sets up on the inlet tube, the delivery port sets up on the outlet pipe, and is a plurality of the heat exchange tube arrange along the length direction of inlet tube, outlet pipe, just the heat exchange tube is S-shaped distribution and one end connection inlet tube, one end connection outlet pipe along vertical direction.

Preferably, a continuous water supply module is arranged between the second output port and the first input port, and the continuous water supply module includes: the water supply device stores working water and is provided with a water supply port at the bottom or a position close to the lower end; the water supply device is arranged below the water supply device, the upper end of the water supply device is communicated with the water supply port, the lower end of the water supply device is connected with the first input port, and a float valve is arranged at the communication position with the water supply port in the water supply device so as to control the on-off of the water supply device and the water supply port through the float valve.

Preferably, an air inlet and an air outlet are formed in the upper end of the steam-water separator, the air inlet is connected with the first output port, a return pipe is arranged at the lower end of the steam-water separator, and the return pipe is connected with the side wall of the water replenishing device and is located above the liquid level of the water replenishing device.

Preferably, an inlet flow channel is connected to the inlet port, and the inlet flow channel extends spirally to form a spiral airflow.

Preferably, the return pipe is provided with at least one U-shaped pipe section, and a drain outlet is provided at the bottom of the U-shaped pipe section.

Preferably, the floating ball valve comprises a valve seat and a floating ball, the valve seat is provided with a water inlet cavity, a water locking cavity and a valve plate, the center of the water inlet cavity is coincident with the center of the valve plate, the cross section area of the water inlet cavity is smaller than that of the water locking cavity, the center of the water locking cavity, which is away from one end of the valve plate, is provided with a water outlet, the center of the valve plate is provided with a water passing structure, so that water with a certain pressure in the water inlet channel can enter the water locking cavity through the water passing structure, the floating ball penetrates through the valve seat through a piston rod, the axis of the piston rod is coincident with the center of the valve plate, and the water outlet can be closed outside the water outlet in the moving process of the piston rod.

Preferably, the valve seat is provided with an upper valve body and a lower valve body, the upper valve body and the lower valve body are connected into a whole through a flange to form an accommodating cavity, and the valve plate is compressed between the upper valve body and the lower valve body and divides the accommodating cavity into the water inlet cavity at the upper end and the water locking cavity at the lower end.

Preferably, the upper end of the water supply device is provided with a water injection port, and the water injection port is communicated with the second output port.

Preferably, the number of the water injection ports is the same as that of the steam generation modules, so that the water injection ports are correspondingly connected with the second output ports on the plurality of steam generation modules.

Preferably, the number of the air inlets is the same as that of the steam generation modules, so that the air inlets are correspondingly connected with the first output ports on the plurality of steam generation modules.

Preferably, the water replenishing device is connected with a water dividing pipe, the water dividing pipe is provided with water dividing ports, and the number of the water dividing ports is consistent with that of the steam generating modules and is used for being connected with the first input port.

Preferably, the steam oven is further provided with a cabinet in which the plurality of steam generation modules are detachably installed.

Preferably, the top of the casing is provided with an air inlet, an air inlet duct is arranged in the casing and/or between the casing and the steam generation module, one end of the air inlet duct is communicated with the air inlet, and the other end of the air inlet duct is communicated with the combustor

The invention has the beneficial effects that:

the steam furnace is provided with the plurality of steam generation modules and the steam-water separator, steam generated by the steam generation modules enters the steam-water separator, the separated saturated steam is subjected to constant-pressure regulation and constant-pressure output, the load change has no influence on the pressure, the water supply in the steam generation modules is not influenced, dry burning can be prevented, and the steam furnace is high in practicability.

Drawings

The invention is further illustrated with reference to the following figures and examples:

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the working principle of the present invention;

FIG. 3 is a schematic view of the external structure of the steam generation module;

FIG. 4 is a schematic view of the internal structure of a steam generation module from a first perspective;

FIG. 5 is a schematic view of the internal structure of the steam generation module from a second perspective;

FIG. 6 is a schematic diagram of a condenser tube;

FIG. 7 is a schematic illustration of an installation of a heat exchange tube;

FIG. 8 is a schematic diagram of the operation of the continuous feed water module;

FIG. 9 is a schematic view of a float valve configuration;

FIG. 10 is a schematic view of a first arrangement of air inlet ducts;

FIG. 11 is a schematic view of a second arrangement of air inlet ducts;

FIG. 12 is a schematic view of an arrangement of barrier structures;

FIG. 13 is an enlarged schematic view of area A of FIG. 12;

FIG. 14 is a schematic view of an arrangement of the intake vent.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Referring to fig. 1 to 5, the invention discloses a condensing gas-steam module furnace, which is provided with a steam-water separator 700 and a plurality of steam generation modules 11, wherein each steam generation module 11 is provided with a burner 200 and a heat exchanger (not marked in the figures) for heating water into steam, and the steam-water separator 700 is connected with the heat exchanger for separating steam from water and outputting the steam, and meanwhile, the separated water is sent into the heat exchanger again.

The steam furnace is provided with the plurality of steam generation modules 11, so that the output steam is higher in efficiency and larger in quantity, the situation that the traditional steam output effect is not ideal can be improved, and the practicability is high.

In the conventional steam boiler, the steam generation module 11 directly feeds cold water into a heat exchanger in the steam generation module 11 to be heated, and the length of a pipeline in the heat exchanger is limited, so that the steam generation efficiency is not ideal. To overcome this problem, in some embodiments, the steam generating module 11 is further provided with a condensing heat exchanger 300, the heat exchanger is disposed above the burner 200 and is provided with a first input port and a first output port, the condensing heat exchanger 300 is disposed above the heat exchanger and is provided with a second input port 301 and a second output port 302, the second output port 302 is communicated with the first input port, and the second input port 301 is connected with a water source, so that when the burner 200 is in operation, water flows into the heat exchanger for heating and vaporization after being preheated by the condensing heat exchanger 300.

Preferably, the steam generation module 11 is further provided with a flue gas collection device 100, the flue gas collection device 100 is disposed above the heat exchanger and is used for collecting combustion tail gas generated by the operation of the burner 200, and the condensing heat exchanger 300 is disposed at an output end of the flue gas collection device 100. Specifically, the combustor 200 and the heat exchanger are disposed in a closed housing 400, a flue gas collecting port is disposed at the upper end of the housing 400, the flue gas collecting device 100 is mounted at the upper end of the housing 400 and connected to the flue gas collecting port, and specifically includes a fan fixing plate 102 and a fan 101, the fan fixing plate 102 is mounted at the upper end of the housing 400 and covers the flue gas collecting port, and the fan 101 is mounted on the fan fixing plate 102 and is provided with a flue gas outlet, so that combustion exhaust generated by the operation of the combustor 200 is collected from the flue gas collecting port and is discharged to the condensing heat exchanger 300 from the flue gas outlet. Like this, both can in time take out the burning tail gas that combustor 200 produced through flue gas collection device 100, also can in time supply the air to in time send burning tail gas into condensing heat exchanger 300 through flue gas collection device 100, be convenient for in time utilize burning tail gas's latent heat, also help improving combustion efficiency.

The heat exchanger comprises a three-level high-temperature heat exchanger and a two-level high-efficiency heat exchanger which are distributed from bottom to top, wherein the three-level high-temperature heat exchanger is provided with three layers of heat exchange pipelines 401, the two layers of high-efficiency heat exchangers are provided with two layers of heat exchange pipelines 401, the two layers of heat exchange pipelines 401 which are adjacent from top to bottom are sequentially communicated, and a gap for combustion tail gas to pass through is reserved in each layer of heat exchange pipeline 401. As shown in fig. 4 and 5, each layer of heat exchange tubes 401 is provided with a plurality of tube structures at intervals, and the material of each layer of heat exchange tubes may be copper tubes or other heat-conducting and high-temperature-resistant metal tubes, so as to form a gap through which combustion exhaust gas passes. In order to ensure that the heat exchange pipes 401 on the upper layer can be sufficiently heated, the two adjacent heat exchange pipes 401 are arranged in a staggered manner, so that the pipe structure of the upper layer of heat exchange pipe 401 is positioned above the gap of the lower layer of heat exchange pipe 401 adjacent to the upper layer of heat exchange pipe 401, and an S-shaped tail gas exhaust path is formed in the vertical direction. Due to the limitation of the maximum size of the shell 400, in order to avoid interference between the heat exchange pipes 401 when they are arranged in a staggered manner, the number of the heat exchange pipes 401 in different layers may be different, and as shown in fig. 5, five pipe structures and four pipe structures are arranged in a staggered manner. And preferably a first input port is provided on the uppermost heat exchange tube 401 and a first output port is provided on the lowermost heat exchange tube 401.

In order to realize the installation of the heat exchange pipe 401, it is preferable that, as shown in fig. 7, a combustion chamber is provided in the casing 400, the combustion chamber includes a fixing bracket 402 with an open front end and a combustion chamber cover 404 closing the open front end of the fixing bracket 402, a plurality of installation grooves 403 with open front ends are provided on two side walls of the fixing bracket 402, and the heat exchange pipe 401 can be pushed into and fixed in the installation grooves 403 from the front ends of the installation grooves 403. The mode of fixing heat exchange pipeline 401 through mounting groove 403 like this, simple structure only needs to realize the intercommunication between the pipeline structure through its self structure, in the outside through the pipeline realize adjacent two-layer heat exchange pipeline 401 between the intercommunication can. In addition, due to the structural arrangement, the interface of the heat exchange pipeline 401 is positioned outside the combustion chamber, so that the service life is prolonged.

Preferably, the condensing heat exchanger 300 is provided with a condenser shell 303 and a condensing pipe arranged in the condenser shell 303, the condenser shell 303 and the fan fixing plate 102 are arranged on the top of the casing 400 in parallel, and the condenser shell 303 is communicated with the flue gas outlet. As shown in fig. 6, the condenser tube includes a water inlet tube 305, a water outlet tube 306 and a plurality of heat exchange tubes 304, the water inlet tube 305 and the water outlet tube 306 are horizontally disposed and parallel to each other, the water outlet tube 306 is located above the water inlet tube 305, a water inlet 704 is disposed on the water inlet tube 305, a water outlet 705 is disposed on the water outlet tube 306, the plurality of heat exchange tubes 304 are arranged along the length direction of the water inlet tube 305 and the water outlet tube 306, the heat exchange tubes 304 are distributed in an S-shape along the vertical direction, one end of each heat.

Meanwhile, the condenser shell 303 is provided with a tail gas inlet and a tail gas outlet (not marked in the figure) on the side walls of two sides perpendicular to the water inlet pipe 305 and the water outlet pipe 306, the tail gas inlet is arranged on the upper half part of the side wall close to the water outlet 705 and connected with the output end of the flue gas collecting device 100, and the tail gas outlet is arranged on the lower half part of the side wall close to the water inlet 704.

Like this through being close to delivery port 705 setting with the tail gas entry, it sets up to be close to water inlet 704 to export the tail gas, when flue gas collection device 100 will burn in tail gas sends into condenser shell 303, earlier carry out the heat exchange with the rivers of delivery port 705 department, later carry out the heat exchange with the rivers of water inlet 704 department, because there is the heat exchange before, consequently, the temperature that is close to the burning tail gas of water inlet 704 department can be less than the temperature of tail gas entry, it can avoid the burning tail gas of temperature reduction to set up like this again reverse and rivers carry out the heat exchange and rise the temperature, improve the heat exchange efficiency with burning tail gas.

In some embodiments, as shown in fig. 8, a continuous water feed module is disposed between the second output port 302 and the first input port, the continuous water feed module comprising: a water supply device 500 for storing working water and having a water supply port 502 at the bottom or near the lower end; the upper end of the water replenishing device 600 is communicated with the water feeding port 502, the lower end of the water replenishing device 600 is connected with the first input port, and a float valve 601 is arranged in the water replenishing device 600 at the communication position with the water feeding port 502 and used for controlling the on-off of the water replenishing device 600 and the water feeding port 502 through the float valve 601.

Preferably, the upper end of the steam-water separator 700 is provided with an air inlet 701 and an air outlet 702, the air inlet 701 is connected with a first output port, the lower end of the steam-water separator 700 is provided with a return pipe 703, and the return pipe 703 is connected with the side wall of the water replenishing device 600 and is positioned above the liquid level of the water replenishing device 600.

The air inlet is connected with an air inlet flow channel, and the air inlet flow channel extends spirally to form spiral air flow. The intake runner may be formed at the top of the steam separator 700, or may be formed by additionally installing a pipe. As shown, one embodiment of a conduit forming an inlet conduit is: the air inlet 701 is connected to a flow duct 704 extending toward the interior of the steam separator 700, and an end of the flow duct 704 extends to a position close to the inner wall of the steam separator 700, and a central axis of the end is tangential to a circumference where the end is located with respect to the central axis of the steam separator 700.

Thus, after the water and steam mixture heated by the heat exchanger enters the steam-water separator 700 from the air inlet 701, a downward spiral steam flow can be effectively formed, liquid water flows into the bottom of the steam-water separator 700 along the side wall under the action of centrifugal force, and steam rises from the middle position and is output from the air outlet 702 at the top. As shown, the steam-water separator 700 adopts the illustrated cylinder structure to reduce the production cost.

Of course, in the actual production process, the central axis of the tail end of the air inlet flow channel and the circumference of the tail end can form other angles, namely, the central axis and the circumference are not tangent, and only the spiral air flow can be formed.

Even if the end is directly perpendicular to the side wall of the steam separator 700, the steam separation can be achieved although the steam discharge efficiency is affected.

As shown in fig. 8, the return pipe 703 is an L-shaped structure, the upper end of the vertical section of the return pipe is connected to the bottom of the steam-water separator 700, and the end of the horizontal section of the return pipe is connected to the side wall of the water replenishing device 600. So that liquid water that has not been heated to steam can be returned from the return pipe 703 to the pipeline for heating.

Further, the return pipe 703 is provided with at least one U-shaped pipe section, and a drain 705 is provided in the U-shaped pipe section. A U-shaped pipe is connected to the lower end of the return pipe 703 to form a U-shaped pipe section, the drain 705 is disposed at the bottom of the U-shaped pipe, and the connection point of the water inlet end of the U-shaped pipe is preferably disposed at the bottom of the vertical section of the return pipe 703. The back flow pipe 703 and the drain 705 that so set up, under the big condition of rivers flow, can flow back simultaneously through back flow pipe 703 and U-shaped pipe, have impurity in rivers and certainly can get into the U-shaped pipe, consequently open drain 705 and can effectively get rid of impurity, impurity can not get into inside pipeline once more.

Further, a water filling port 501 is arranged at the upper end of the water supply device 500, and the water filling port 501 is communicated with the second output port 302. The number of the water injection ports 501 corresponds to the number of the steam generation modules 11 for corresponding connection with the second output ports 302 of the plurality of steam generation modules 11.

Similarly, the number of the air inlets 701 is the same as that of the steam generation modules 11, so as to be correspondingly connected with the first output ports of the plurality of steam generation modules 11.

In order to connect a plurality of steam generation modules 11, preferably, the lower end of the water replenishing device 600 is connected to a water diversion pipe 13, and the water diversion pipe 13 is provided with water diversion ports, the number of the water diversion ports is the same as the number of the steam generation modules 11 and is used for connecting a first input port. Meanwhile, an internal circulating pump 12 can be arranged in the pipeline connection to realize water circuit circulation.

As shown in fig. 9, the float valve 601 includes a valve seat 602 and a float ball 618, the valve seat 602 is provided with a water inlet cavity 605, a water locking cavity 606 and a valve plate 611 located therebetween, the center of the water inlet cavity 605 is provided with a water inlet flow passage 619 corresponding to the center of the valve plate 611, the cross-sectional area of the water inlet flow passage 619 is smaller than that of the water locking cavity 606, the position of the water locking cavity 606 away from the center of the valve plate 611 is provided with a water drainage port 614, the center of the valve plate 611 is provided with a water passing structure, so that water in the water inlet flow passage 619 passes through the water drainage structure and enters the water locking cavity 606, the float ball 618 is arranged on the valve seat 602 through a piston rod 616, and the piston rod 616 can close the water drainage.

The valve seat 602 is provided with an upper valve body 603 and a lower valve body 604, the upper valve body 603 and the lower valve body 604 are connected into a whole through a flange to form a containing cavity, and the valve plate 611 is compressed between the upper valve body 603 and the lower valve body 604 and divides the containing cavity into a water inlet cavity 605 at the upper end and a water locking cavity 606 at the lower end.

Preferably, the central position of the valve plate 611 is provided with a plunger 612, the cross section of the plunger 612 is larger than the size of the water inlet channel 619, and the central position of the plunger 612 is provided with a water through hole for communicating the water inlet cavity 605 and the water locking cavity 606. A limiting pressing sheet 609 is arranged in the water inlet cavity 605 and/or the water locking cavity 606, an abdicating hole for the plunger 612 to pass through is formed in the limiting pressing sheet 609, and a water passing hole 610 is formed in the limiting pressing sheet 609. A cylinder 613 penetrating into the water through hole is fixedly arranged in the water locking cavity 606, an annular water passing gap is reserved between the cylinder 613 and the water through hole, the cross-sectional area of the water passing gap is smaller than that of the water discharge opening 614, and the water passing structure is formed through the water passing gap.

And, a tapered surface adapted to the inlet flow passage 619 is provided at an end of the plunger 612 adjacent to the inlet flow passage 619. The valve plate 611 is made of high-temperature-resistant and aging-resistant silica gel, the plunger 612 and the limiting pressing piece 609 are made of stainless steel, and the cylinder 613 is made of brass.

In addition, it is preferable that the valve seat 602 is provided with a ring of extension wall 607 extending outward of the drain opening 614, a valve cover 608 is attached to a tip end of the extension wall 607, and the piston rod 616 is inserted into the valve cover 608. The valve cover 608 is provided with a hole for water drainage, and the water inlet cavity 605 is provided with a hole for water outlet. A silicone pad 615 is disposed on an end of the piston rod 616 proximate the bleed opening 614. The upper valve body 603, the lower valve body 604 and the valve cover 608 are all made of aluminum profiles, and other non-silica gel materials are preferably made of 304 stainless steel. And a sliding bearing 617 may be provided since the piston rod 616 needs to be moved frequently.

The working principle of the float valve 601 is as follows:

when sufficient water is in the water replenishing device 600, the liquid level is high, the floating ball 618 floats upwards to drive the piston rod 616 to block the water outlet 614, water in the water inlet channel 619 enters the water inlet cavity 605 and the water locking cavity 606 at the same time, when the water locking cavity 606 is filled with water, because the cross section area of the water locking cavity 606 is larger than that of the water inlet channel 619, the water flow pressure is consistent, the water inlet cavity 605 is provided with a water outlet hole position, the water cannot be stored for keeping pressure, therefore, the water in the water locking cavity 606 can push the valve sheet 611 to move close to the water inlet channel 619 until the water inlet channel 619 is closed, and the function of closing the water inlet end when the water level rises is;

when the liquid level in the water replenishing device 600 slightly drops, the floating ball 618 drives the piston rod 616 to move so as to open the water outlet 614, water in the water locking cavity 606 is discharged from the water outlet 614, and the valve plate 611 moves away from the water inlet flow passage 619 under the action of the water inlet pressure of the water inlet flow passage 619 and the material performance of the valve plate 611, so that the water in the water inlet flow passage 619 is discharged from the water outlet hole of the water inlet cavity 605 and the water outlet 614 of the water locking cavity 606 at the same time, and the function of automatically opening the water inlet end when the water level drops is realized.

The floating ball 618 valve 601 arranged by the structure mechanism is more sensitive than the traditional structure, and is suitable for the use conditions of high temperature and high pressure.

Referring to fig. 1, 10 and 11, in some embodiments, the steam oven is further provided with a cabinet 10, and a plurality of steam generation modules 11 are detachably mounted in the cabinet 10. And the top of the casing 10 is provided with an air inlet 801, an air inlet duct is arranged in the casing 10 and/or between the casing 10 and the steam generation module 11, one end of the air inlet duct is communicated with the air inlet 801, and the other end is communicated with the burner 200.

Set up air intake 801 at the top of casing 10 like this, can effectively guarantee the air input to can avoid the drop of water to condense and drip and the condition emergence that is blockked up, set up air intake 801 in the top simultaneously, neither can destroy the whole outward appearance nature of casing 10, also be difficult to touch, the security is higher, and the practicality is strong.

Referring to fig. 10-13, in some embodiments, the upper end of the cabinet 10 is provided with a cover plate 800, and the intake vent 801 is located below the cover plate 800. As shown in the figure, the upper end opening of casing 10 sets up, and apron 800 covers the open end of casing 10 and keeps a determining deviation with the open end through connecting foot or other connection structure between the open end, and apron 800's size is greater than casing 10 and extends in the casing 10 outside, and downwardly extending is provided with the curb plate in the edge of apron 800, and the height of curb plate is greater than the distance between apron 800 and the open end. Thus, the air inlet 801 is formed by the space between the side plate and the cabinet 10. With the air inlet 801 arranged in this way, air needs to flow upward from the lower side of the side plate into the casing 10, so that foreign objects can be effectively prevented from entering. And a fence structure 802 as shown in fig. 11 may be further provided at an upper opening of the cabinet 10 to improve structural strength, form a filter net, guide intake air, and the like. In larger sizes, the cover plate 800 may be provided in multiple pieces, as shown, to create more intake vents 801.

Referring to fig. 14, in some embodiments, the air inlet 801 is disposed at an upper end region of a side wall of the casing 10, and the casing 10 is provided with a shielding structure 803 at an outer side of the air inlet 801, and the shielding structure 803 shields an outer side and/or an upper side of the air inlet 801. As shown in fig. 13, in order to facilitate the manufacturing and molding, a shielding structure 803 is directly molded on the upper end region of the side wall of the housing 10, so that the air inlet 801 is molded at the same time.

In order to achieve the communication between the air inlet 801 and the steam generation module 11, i.e. the air inlet function, in some embodiments, a gap is maintained between the casing 10 and the steam generation module 11, and the air inlet 801 communicates with the gap between the casing 10 and the steam generation module 11 to form an air inlet duct. In this manner, the air inlet 801 is only required to be communicated with the inside of the casing 10, and the air flows from the upper side to the lower side of the steam generation module 11 to realize air inlet.

However, considering that the air intake method easily affects the steam generation efficiency of the steam generation module 11, in some embodiments, a flow channel is disposed in the sidewall of the housing 10, the air inlet 801 communicates with the upper end of the flow channel, and the lower end of the flow channel is disposed at the inner side opening of the housing 10, thereby forming an air inlet channel. Specifically, the inner flow channel can be set only by setting the casing 10 to be a double-layer partition structure. Therefore, air is directly guided to the lower part of the steam generation module 11 through the side wall flow channel of the casing 10, the steam generation efficiency is not influenced, the steam generation efficiency is favorably ensured, and the practicability is high. And most of the cabinets 10 are of a double-layer structure, so that the production cost is low.

As shown in fig. 10, in the steam oven of the present invention, a plurality of steam generation modules 11 are disposed in a casing 10, and a plurality of air inlet ducts communicated with an air inlet 801 are formed on the casing 10 around the steam generation modules 11. Wherein a plurality of steam generation modules 11 are arranged in two layers side by side, and a tail gas discharge pipe is arranged between the two layers of steam generation modules 11. The bottom of the steam generation module 11 is provided with a burner air inlet, the top is provided with a tail gas discharge port, the burner air inlet is communicated with the air inlet 801, and the tail gas discharge port is connected with a tail gas discharge pipe.

In addition, in order to discharge the dropping water drops, a bottom plate is disposed at the bottom of the casing 10, and a plurality of water leakage holes and air inlet holes are opened on the bottom plate. Meanwhile, the lower end of the bottom plate is provided with a foot pad. Therefore, water beads can be discharged through the water leakage holes and the air inlet holes, and a small amount of air inlet can be realized. The control of the intake air amount can be realized by controlling the intake opening 801 and the intake hole.

In the condensing gas-steam modular furnace, a plurality of steam generating modules 11 can work independently, the burner 200 is an ultra-low nitrogen burner, and the condensing heat exchanger 300 and the heat exchanger form a multi-stage heat exchange structure. The whole working process and principle are as follows:

the external water pump pumps out and pressurizes purified water, the purified water is preheated by the condensing heat exchanger 300 and then is collected and sent to the continuous water supply module, and the continuous water supply module has a synchronous and equivalent continuous water supply function according to the water demand of output steam. After the module furnace is started, the burner 200 is ignited, circulating water is rapidly heated through the multilayer heat exchange pipeline 401 to be boiled and vaporized, generated steam enters the steam-water separator 700, the separated saturated steam is subjected to pressure stabilization regulation and constant pressure output, and the pressure is not influenced by load change; the water separated by the steam-water separator 700 enters the continuous water supply module, is mixed with the preheated water supplied synchronously and then continues to circulate.

Because the invention adopts the independently developed ultra-low nitrogen combustion technology and condensation heat exchange technology, the smoke discharge temperature is less than 65 ℃, the emissions of carbon monoxide and nitric oxide are respectively less than 60 mg/cubic meter and less than 20 mg/cubic meter, the heat efficiency can reach 103 percent, the natural gas consumption per ton of steam is less than 70 cubic meters, and the energy-saving effect is obvious.

The full-automatic continuous water supply module adopted by the invention is an original technology which is not independently researched and developed in the steam boiler industry at present. The device has extremely small water capacity (less than 0.5 liter), does not need high-low water level detection and any electric control, and utilizes the pressure difference between water supply and steam and the hydraulic amplification principle to convert the extremely small water quantity change in the continuous water supply module into the control action of the opening degree of the floating ball valve, thereby realizing the continuous water supply in the whole process according to the requirement and always keeping the water quantity in the internal circulation system unchanged.

The above examples are only preferred embodiments of the present invention, and other embodiments of the present invention are possible. Those skilled in the art can make equivalent changes or substitutions without departing from the spirit of the present invention, and such equivalent changes or substitutions are included in the scope set forth in the claims of the present application.

Claims

1. The condensing type gas and steam module furnace is characterized by being provided with a steam-water separator and a plurality of steam generation modules, wherein each steam generation module is provided with a burner and a heat exchanger and used for heating water into steam, the steam-water separator is connected with the heat exchanger and used for separating steam from water and outputting the steam, and meanwhile, the separated water is sent into the heat exchanger again.

2. The condensing gas-steam modular furnace of claim 1, wherein the steam generating module is further provided with a condensing heat exchanger, the heat exchanger is arranged above the burner and is provided with a first input port and a first output port, the condensing heat exchanger is arranged above the heat exchanger and is provided with a second input port and a second output port, the second output port is communicated with the first input port, the second input port is connected with a water source, so that when the burner works, water flows through the condensing heat exchanger to enter the heat exchanger for heating and vaporization.

3. The condensing gas-steam modular furnace of claim 2, wherein the steam generating module is further provided with a flue gas collecting device, the flue gas collecting device is arranged above the heat exchanger and is used for collecting combustion tail gas generated by the operation of the burner, and the condensing heat exchanger is arranged at the output end of the flue gas collecting device.

4. A condensing gas and steam modular furnace as claimed in claim 2, wherein a continuous water feed module is provided between said second outlet and said first inlet, said continuous water feed module comprising: the water supply device stores working water and is provided with a water supply port at the bottom or a position close to the lower end; the water supply device is arranged below the water supply device, the upper end of the water supply device is communicated with the water supply port, the lower end of the water supply device is connected with the first input port, and a float valve is arranged at the communication position with the water supply port in the water supply device so as to control the on-off of the water supply device and the water supply port through the float valve.

5. The condensing gas-steam module furnace of claim 4, wherein the upper end of the steam-water separator is provided with an air inlet and an air outlet, the air inlet is connected with the first output port, the lower end of the steam-water separator is provided with a return pipe, and the return pipe is connected with the side wall of the water replenishing device and is positioned above the liquid level of the water replenishing device.

6. A condensing gas and steam modular furnace as claimed in claim 5, wherein the inlet port is connected with an inlet runner that extends helically for forming a helical flow of gas.

7. A condensing gas and steam modular furnace as claimed in claim 5, wherein said return pipe is provided with at least one U-shaped pipe section and a drain is provided in said U-shaped pipe section.

8. A condensing gas and steam modular furnace as in claim 4, wherein said ball valve comprises a valve seat and a ball float, the valve seat is provided with a water inlet cavity, a water locking cavity and a valve plate, the center of the water inlet cavity is overlapped with the center of the water locking cavity, the valve plate is positioned between the water inlet cavity and the water locking cavity, the water inlet cavity is provided with a water inlet flow channel corresponding to the center of the valve plate, the cross section area of the water inlet runner is smaller than that of the water locking cavity, a water outlet is arranged at the center of one end of the water locking cavity, which is away from the valve plate, the central position of the valve plate is provided with a water passing structure, so that water with certain pressure in the water inlet flow channel can enter the water locking cavity through the water passing structure, the floating ball is arranged on the valve seat in a penetrating way through a piston rod with the axis coinciding with the central position of the valve plate, the piston rod can close the drainage opening from the outer side of the drainage opening in the moving process.

9. A condensing gas and steam modular furnace as recited in claim 8, wherein said valve seat has an upper valve body and a lower valve body, said upper valve body and said lower valve body are integrally connected by a flange and form a cavity, said valve plate is compressed between them and divides said cavity into said inlet chamber at the upper end and said lock chamber at the lower end.

10. A condensing gas and steam modular furnace as claimed in claim 1, further comprising a cabinet, a plurality of said steam generating modules being removably mounted in said cabinet; the top of the casing is provided with an air inlet, an air inlet duct is arranged in the casing and/or between the casing and the steam generation module, one end of the air inlet duct is communicated with the air inlet, and the other end of the air inlet duct is communicated with the combustor.