CN205638586U - High -efficient steam heat tracing system - Google Patents

Abstract

The utility model provides a high -efficient steam heat tracing system, including steam heat tracing module, exhaust steam power module and condensate water recoverable module, the steam heat tracing module is used for maintaining the temperature by the hot material of companion, exhaust steam power module is used for utilizing the exhaust steam of steam heat tracing module exhaust to generate electricity, condensate water recoverable module is used for changing the exhaust steam of exhaust steam power module exhaust into condensate water, exhaust steam power module's generating mode includes through the one -level generating mode of organic working medium rankine cycle generating set electricity generation with through the second grade generating mode of vapor expansion electricity generation with the electricity generation of organic working medium rankine cycle electricity generation combination unit. The utility model discloses a high -efficient steam heat tracing system has increased exhaust steam power module and condensate water recoverable module at the back in the steam heat tracing module, and energy that can the make full use of exhaust steam generates electricity to retrieve the condensate water, thereby realized the thorough utilization to accompanying hot power steam volume, play the effect of water economy resource simultaneously.

Description

A kind of high-efficiency steam tracing system

Technical field

This utility model relates to a kind of tracing system, is particularly suited for heat tracing object and has strict heat tracing temperature model Enclose the device of requirement.

Background technology

In chemical processes, there is substantial amounts of media flow, medium includes steam state, liquid, solid-state, Wherein steam state, liquid medium are typically by compressor, transport pump, and solid state medium is in order to make it at pipe Road flows continuously, reduces handling, cost of transportation, reduce side reaction simultaneously, often solid state medium is heated For melting state, then carried by technique pump, make chemical process form the continuous process of complete set. As during taking sulfur to be raw material antacid, sulfur is fragility crystalline solid or powder at normal temperatures, its Fusing point is 118.9 DEG C, becomes liquid sulfur and store to molten sulfur storage tank after being heated by steam.In order to make molten sulfur viscosity Minimum, mobility are best, it is simple to carried by pipeline, need to utilize steam that molten sulfur storage tank is carried out heat tracing, Molten sulfur temperature is made to maintain 140 ± 5 DEG C.

During being similar to molten sulfur heat tracing, molten sulfur has the tracing system of rigid temperature area requirement, its Heat tracing requires to be different from general heating requirements.General steam-heating system is by low-temperature receiver heating process, cold Source temperature constantly rises, and heat source temperature constantly declines.In the process, thermal source maximum temperature is wanted more than low-temperature receiver Seeking the temperature being heated to, thermal source minimum temperature can be added by the temperature of initial heating, this kind slightly larger than low-temperature receiver In thermal process, heat source temperature allows excursion the biggest.And in steam tracing system, heat source temperature allows Excursion is the least, and after thermal source utilizes heat energy, the minimum temperature of discharge need nonetheless remain for maintaining by heat tracing thing More than the temperature of matter, otherwise do not have heat tracing function, heat can be absorbed on the contrary from by the material of heat tracing.

Therefore, in tracing system, after thermal source heat tracing, discharge temperature remains in that higher state.At molten sulfur After storage tank steam tracing, the exhaust steam of discharge can reach more than 140 DEG C.Owing to the steam after heat tracing belongs to unsaturated Steam, and steam quality is poor, is not easy to conveying and utilizes.In traditional system design, after heat tracing Unsaturated steam recovery section condensation water, for life, has more exhaust steam to put idle discharge, causes substantial amounts of heat Can lose with water resource.For this kind of situation, a kind of efficient steam tracing system of design is particularly important.

Summary of the invention

For the problems referred to above, this utility model provides one can utilize tracing steam energy and joint efficiently The about steam tracing system of water resource.

For achieving the above object, this utility model adopts the technical scheme that

A kind of high-efficiency steam tracing system, including steam tracing module, exhaust steam electricity generation module and condensate-water polishing Module；Described steam tracing module is for maintaining by the temperature of heat tracing material, and described exhaust steam electricity generation module is used for The exhaust steam utilizing steam tracing module to discharge generates electricity, and described condensate-water polishing module is for generating electricity exhaust steam The exhaust steam that module is discharged is changed into condensation water；The power generation mode of described exhaust steam electricity generation module includes by organic work The one-level power generation mode of matter Rankine cycle generating set generating, and bright with organic working medium by steam expansion generating It agree two grades of power generation modes of circulating generation combination unit generation.

Further, described organic rankie cycle generating set includes preheating/vaporizer, cooler, follows Ring pump and turbine set, the first input end of described preheating/vaporizer is used for inputting exhaust steam, and outfan connects thoroughly Flat unit, described cooler connects the outfan of described turbine set and the input of working medium circulating pump respectively, Described working medium circulation delivery side of pump connects the second input of described preheating/vaporizer.

Preferably, during the exhaust steam pressure height that described steam tracing module is discharged, described exhaust steam electricity generation module uses Two grades of power generation modes；When the exhaust steam pressure of described steam tracing module discharge is low, described exhaust steam electricity generation module is adopted Use one-level power generation mode.

High-efficiency steam tracing system of the present utility model, adds exhaust steam generating mould in steam tracing module rear Block and condensate-water polishing module, after making tracing steam to being heated by heat tracing material, additionally it is possible to make full use of exhaust steam Energy generate electricity, and reclaim condensation water, it is achieved thereby that the thorough utilization to tracing steam energy, with Time play the effect of saving water resource.As further preferred version, described exhaust steam electricity generation module has According to exhaust steam pressure parameter, two kinds of power generation modes, can determine which kind of power generation mode of employing generates electricity.One-level Power generation mode is applicable to the situation that exhaust steam pressure ratio is relatively low, utilizes organic rankie cycle generating set, fills Absorption exhaust steam latent heat is divided to generate electricity；Two grades of power generation modes are applicable to the situation that exhaust steam pressure ratio is higher, first lead to Crossing steam expansion to generate electricity, after steam expansion, the steam of lower pressure is sent out by organic rankie cycle again Group of motors, fully absorbs exhaust steam latent heat and generates electricity, thus meets the demand under different situation.

Accompanying drawing explanation

Fig. 1 is the system composition schematic diagram of high-efficiency steam tracing system of the present utility model；

Fig. 2 is the structural representation of steam tracing module；

Fig. 3 be exhaust steam electricity generation module be the structural representation of one-level power generation mode；

Fig. 4 be exhaust steam electricity generation module be the structural representation of two grades of power generation modes；

Fig. 5 is the structural representation of condensate-water polishing module；

Description of reference numerals: 1-steam tracing module, 2-exhaust steam electricity generation module, 3-condensate-water polishing module, 21- Steam expansion generating set, 22-organic rankie cycle generating set, 221-preheating/vaporizer, 222-is saturating Flat unit, 223-cooler, 224-working medium circulating pump.

Detailed description of the invention

In order to be further appreciated by this utility model, below in conjunction with embodiment to this utility model preferred embodiment It is described, but it is to be understood that these describe simply for further illustrating feature of the present utility model and excellent Point rather than the restriction to this utility model claim.

As Figure 1-5, a kind of high-efficiency steam tracing system, including steam tracing module 1, exhaust steam generating mould Block 2 and condensate-water polishing module 3.Wherein, steam tracing module 1 utilizes steam to maintain by the temperature of heat tracing material Degree, and discharge unsaturated exhaust steam.The unsaturated exhaust steam discharged is utilized by exhaust steam electricity generation module 2 and generates electricity, Exhaust steam afterwards is condensed Water Sproading module 3 further and is changed into condensation water, for other purposes.Use this Design, whole system achieves the thorough utilization to tracing steam energy, simultaneously works as the work of saving water resource With.

According to the difference of the exhaust steam pressure that steam tracing module 1 is discharged, exhaust steam electricity generation module 2 has two kinds of generatings Pattern.Concrete, as it is shown on figure 3, one-level power generation mode is sent out by organic rankie cycle generating set Electricity.Organic rankie cycle generating set includes preheating/vaporizer 221, cooler 223, working medium circulating pump 224 and turbine set 222.The first input end of preheating/vaporizer 221 is used for inputting exhaust steam, and outfan connects Turbine set 222, cooler 223 connects the outfan of turbine set 222 and working medium circulating pump 224 respectively Input, the outfan of working medium circulating pump 224 connects the second input of preheating/vaporizer 221.Work as exhaust steam When pressure ratio is relatively low, utilizes above-mentioned organic rankie cycle generating set, exhaust steam latent heat can be fully absorbed Generate electricity.

As shown in Figure 4, two grades of power generation modes are applicable to the situation that exhaust steam pressure ratio is higher, including passing through steam Expansion power generation unit 21 and organic rankie cycle generating set 22.Exhaust steam first passes through steam expansion electromotor Group 21 generates electricity, and after steam expansion, the steam of lower pressure is again by organic rankie cycle generating set 22, fully absorb exhaust steam latent heat and generate electricity.

Two kinds of above-mentioned power generation modes, meet the demand under different situation.

Illustrate that high-efficiency steam tracing system of the present utility model obtains below by specific embodiment useful Effect.

The a set of 1,000,000 t/a sulphur-burning sulphuric acid system of certain enterprise, material district is provided with 5000t molten sulfur storage tank 4 groups.Liquid Sulfur storage tank passes through 0.4MPa (g), 15t/h saturated vapor heat tracing, maintains molten sulfur temperature 140 ± 5 DEG C.Heat exchange After some vapor condense into Water Sproading and live for worker's shower etc., major part band water exhaust steam is not easy to pipe Road carries, and is directly discharged into trench.

Temperature 140 ± 5 DEG C need to be maintained by molten sulfur, determine that exhaust steam may utilize minimum temperature 135 DEG C.Due to this Exhaust steam pressure ratio is relatively low, utilizes exhaust steam expansion power generation uneconomical, is directly designed to use organic working medium Rankine to follow The one-level power generation mode of environment-development group of motors.By result calculated below, determine recovery benefit:

1,0.4MPa (g) saturated vapor specific enthalpy is 2748.11kJ/kg, then the total amount of heat of 15t/h steam is

$\frac{2748.11\×15000}{3600}=11450kW$

2, its external surface area S=915m can be calculated according to molten sulfur storage tank overall dimensions², molten sulfur storage tank uses rock wool Plate insulation material, surrounding insulation thickness 120mm, to guarantee Molten sulphur storehouse external skin temperatures t_w<35℃.When The per day lowest temperature t in ground is-5 DEG C, heat transfer coefficient a takes 15.12W/ (m2 DEG C), calculates the storage of separate unit molten sulfur The maximum heat loss Q of tank is:

Q=aS (t_W-t)=15.12 × 915 × (35+5)=553kW

Then 4 groups of molten sulfur storage tank maximum heat losses add up to

553 × 4=2214kW

3, diffusing exhaust steam total amount of heat (the not utilized heat of tracing steam) is

11450-2212=9238kW

4, design condensation water drainage temperature is 60 DEG C (specific enthalpies 251.15kJ/kg), then diffuse the available heat of exhaust steam Amount is

$9238-\frac{251.15\&times;15000}{3600}=8192kW$

Generating set heat efficiency is according to 10% meter, and generated output is 819.2kW.

5, according to running 8000 hours meters unit year, then annual electricity generating capacity is up to 6,550,000 degree, reclaims in year and condenses 120,000 tons of water.

Being 0.6 yuan/degree according to business electrical electricity price, softening water production cost is 10 yuan/ton, then year increases benefit For

655 × 0.6-12 × 10=,513 ten thousand yuan.

The explanation of above example is only intended to help to understand method of the present utility model and core concept thereof.Should When pointing out, for those skilled in the art, before without departing from this utility model principle Putting, it is also possible to this utility model is carried out some improvement and modification, these improve and modification also falls into this reality With in novel scope of the claims.

Claims (3)

1. a high-efficiency steam tracing system, it is characterised in that: include steam tracing module, exhaust steam generating mould Block and condensate-water polishing module；Described steam tracing module is for maintaining by the temperature of heat tracing material, described weary Vapour electricity generation module generates electricity for the exhaust steam utilizing steam tracing module to discharge, described condensate-water polishing module For the exhaust steam that exhaust steam electricity generation module is discharged is changed into condensation water；The power generation mode of described exhaust steam electricity generation module Including the one-level power generation mode generated electricity by organic rankie cycle generating set, and sent out by steam expansion Electricity combines two grades of power generation modes of unit generation with organic rankie cycle generating.

2. high-efficiency steam tracing system as claimed in claim 1, it is characterised in that: described organic working medium is bright It agree circulating generation unit and include preheating/vaporizer, cooler, circulating pump and turbine set, described preheating/evaporation The first input end of device is used for inputting exhaust steam, and outfan connects turbine set, and described cooler connects institute respectively Stating the outfan of turbine set and the input of working medium circulating pump, described working medium circulation delivery side of pump connects institute State the second input of preheating/vaporizer.

3. high-efficiency steam tracing system as claimed in claim 1 or 2, it is characterised in that: described steam is accompanied During the exhaust steam pressure height that thermal modules is discharged, described exhaust steam electricity generation module uses two grades of power generation modes；Described steam When the exhaust steam pressure of heat tracing module discharge is low, described exhaust steam electricity generation module uses one-level power generation mode.